FUNCTION:Multiplate slip clutches control torque for intermittent, continuous, or overload slip. It will drive in both directions, slip when the torque setting is reached, and resume driving as the load is reduced. These clutches are excellent as continuous or intermittent drag brakes, protection against overloads, for “soft starts,” slip at the end of a stroke, as friction hinges, for screwing on container caps, etc.
CONSTRUCTION:The clutch consists of two assemblies: a cartridge and a housing (see cutaway above). The cartridge is set-screwed or keyed to the input shaft. The housing is either set-screwed or keyed to the output shaft or, as shown, is attached to the output gear or pulley with a bronze bearing to allow relative motion between the input shaft and the output gear/pulley. Torque is transmitted from the flats on the hub to the mating flats on the inner plates, through the friction pads to the outer plates, through the torque pins to the housing and the output gear/pulley. The torque level is controlled by compressing the springs with the adjusting nut. For a fixed torque clutch, a collar is attached to the hub in a fixed position instead of the adjusting nut. In operation, either the input shaft or the housing can be the input member, with the other member being driven.
CAPACITY:The clutch capacity as noted in the catalog is based on continuous operation at 50 rpm for over 25 million cycles. Torque, rpm, duty cycle and life are interdependent. A reduction of any of these will allow an increase in any other. Running at 25 rpm will allow twice the torque, or running for only 10% of the cycle will allow higher rpm, etc.The limit is based on heat buildup measured in watts: English Unit Watts = Torque (lbf) x rpm x 0.0118 x % Duty CycleMetric Unit Watts = Torque (Nm) x rpm x 0.104 x % Duty Cycle
For typical applications, see examples on page 13-4.
FEATURES:Fully adjustable within rating limits. Low stick / slip ratio.Continuous slip within dissipation limit.Available with bronze bearing in hub end so thatgear, pulley, etc. can be mounted on hub “D”.
UNLIMITED APPLICATIONS:*Intermittent motion Torque limiting Indexing Hinging Phase adjustment Many more Feeding
*The ingenuity of engineering has led to applications with labelers, indexing, film transport, instrumentation, business machines, computer peripherals, packaging, mailing, plotters, paper feeds and many more. We supply stock clutches or we work with you to develop units for your specific applications.
TYPICAL MULTIPLATE SLIP CLUTCH APPLICATIONS:
TIMING BELT ON HOUSINGTiming belt drives housing. Torque transmitted through adjustable pressure plates to shaft. Also operates as shaft input to timing belt.
SHAFT-TO-SHAFT CONTROLEither shaft as input. Fixed torque transmitted through pressure plates. Shafts must be journalized. Also can be adjustable torque.
SLIP CARTRIDGE WITH GEARPressure pads transmit torque directly to gear for space saving package.
CLUTCH WITH A MODIFIED GEARTorque transmitted directly from gear through pins to adjustable pressure plates.
KNOB WITH TORQUE PROTECTIONKnob connected directly to housing. Fixed torque transmitted to shaft.Will slip above preset torque.
BRAKE TO FRAME OF MACHINEOuter pressure plates held to machine frame. Adjustable braking pressure transmitted to shaft.
“SINGLE” REVOLUTION CLUTCHInput shaft turns continuously. Output shaft turns when latch is disengaged. Single revolution, partial revolution, or multi-revolutions can be designed.
CONSTANT TORQUE – SUPPLY OR REWIND SPOOLSlip clutch mounted directly to spool will give constant torque. Mounted directly to constant diameter cylinder will give constant tension. Many variations available to control wire supply system.
FEATURES:Long life under continuous slip conditions.Unidirectional or bidirectional operation.Same or different clockwise and counterclockwise torques.Precise and stable limit torque calibration (range: 1.0 to 480 ozf in.).Same torque at breakaway as at high slip velocities.Mounting provisions for gear, sprocket or pulley.Corrosion-resistant materials.
APPLICATIONS:Tension control of film or tape drivesTransmission overload protection
SPECIAL DESIGNS:
The standard line of slip elements provides a wide selection of limit torques, sizes and coupling arrangements. In addition, our engineers will modify designs to meet your specific requirements in such areas as: Configuration Driving arrangement Limit torques from a fraction of an ozf in. to several lbf ft. Calibration of torque to a tolerance of ± 5% Different limit torques for the two directions of rotation Spring windup and limit torque combination. The spring action of the slip element is useful for tensioning of tape and prevention of slack loops.
* Stock units are calibrated with equal clockwise and counterclockwise slip torques corresponding to the tabulated Upper Limit Torques. Other torques are readily available from full, down to 1/8 of the Upper Limit Torque for each model. Torque values are independent of each other for clockwise and counterclockwise rotation, and may be specified the same or different for the two directions.
** All clutches in this series have a pilot diameter “K” and three tapped holes “N” for mounting a gear, sprocket or pulley on the input hub. Screw penetration into the clutch housing must not exceed the depth specified in column “N”. Concentricity of pilot diameter “K” to bore “C” is .001 T.I.R. max.
All slip clutches are designed for long life under continuous slip conditions. The useful life of these elements is a function of the transmitted torque and slip speed.
The life of the slip couplings & clutches is defined as the number of hours of continuous slip required to cause a deviation of 10% from the initial calibrated torque value. Extensive life tests have been performed on a number of standard units. The “Life Expectancy Curves” are designed for approximating the life span of standard slip clutches and couplings.
EXAMPLE: If a slip clutch is to provide a torque limit of 50 ozf in. at a continuous slip speed of 100 rpm for 500 hours, the smallest item which can be calibrated is from the S9940Y–SWC15A.. series.
The upper limit torque for this unit is 80 ozf in.
Limit Torque Ratio = Required TorqueUpper Limit Torque
= 50/80 = 0.63
From “Life Expectancy Curves” 100 rpm & 0.63 ratio:
Life = 2,800,000 Rev =2,800,000 Rev
100 Rev / Min. x 60 Min. / Hour= 466.7 Hrs.
The 466.7 hours life value is less than desired 500 hours.The next larger slip clutch belongs to the S9940Y–SWC18A series.The upper limit torque for this unit is 120 ozf in.
Limit Torque Ratio = 50/120 = 0.42
From “Life Expectancy Curves” for 100 rpm & 0.42 ratio:
Life = 4,800,000 Rev = 4,800,000 Rev100 Rev / Min. x 60 Min. / Hour
= 800 Hrs.
A S9940Y–SWC18A.. series clutch will provide the desired life.
3,0701,420
1,420 620
620 250
250 100
TYPICAL ELEMENT LIFE(STANDARD CATALOG MODELS)
rpm TorqueHours of Continuous
Slip inEach Direction
Hours of OperationDuty Cycle:
1 Sec. Slip, 1 Sec. Rest
1/2 Upper LimitUpper Limit
1/2 Upper LimitUpper Limit
1/2 Upper LimitUpper Limit
1/2 Upper LimitUpper Limit
25
50
100
200
6,5003,040
3,0401,420
1,420 620
620 250
.25
.30
.35
.40
.50
.60
.70
.80
.901.00
0 25 50 75 100 125 150 175 200
10 x 10 6
9 x 10 6
8 x 10 6
7 x 10 6
6 x 10 6
5 x 10 6
4 x 10 6
3 x 10 6
2 x 10 6
10 6
LIFE
(REV
OLU
TIO
NS
OF
SLIP
)
LIM
IT T
ORQ
UE
RATI
O
LIFE EXPECTANCY CURVESCONTINUOUS SLIP SPEED (rpm)
The table entitled “Typical Element Life” provides life in hours of operation for some typical slipspeeds and torques of standard slip elements. The torque is presented in terms of 1/2 and full upper limit torque rating of a given slip element.
AVERAGE POWER DISSIPATION (P)
Continuous Slip P = .00074 TN
Cycle Slip P = .00074 TNC
where: T = Slip Torque [ozf in.] N = Average Slip Speed [rpm]
FEATURES:Long life under continuous slip conditions.Unidirectional or bidirectional operation.Same or different clockwise and counterclockwise torques.Precise and stable limit torque calibration (range: 1/2 to 88 ozf in.).Same torque at breakaway as at high slip velocities.Corrosion-resistant materials.
APPLICATIONS:Tension control of film or tapeTransmission overload protectionFriction loads for testing components
RECOMMENDED MOUNTING PROCEDURE:
Coupling is slipped over one shaft and applicable screws tightened.Second shaft is inserted into other end of coupling.Pull loose end of coupling back about .02 in. and tighten applicable screws.
The slip coupling serves as a torque limiter as well as a coupling for two colinear shafts. This coupling is equipped with hubs at both ends for pinning to the two shafts. When the load exceeds the limit torque of a slip coupling, the two shafts rotate relative to each other at the full limit torque. The standard coupling is designed to operate with 3° angular or linear misalignments of up to .010 in. between the two shafts. The mounting hole diameters of the slip couplings can differ for the two ends, so that different diameters of “in-line” shafts can be coupled together.
* Stock units are calibrated with equal clockwise and counterclockwise slip torques corresponding to the tabulated Upper Limit Torques. Other torques are readily available from full, down to 1/8 of the Upper Limit Torque for each model. Torque values are independent of each other for clockwise and counterclockwise rotation, and may be specified the same or different for the directions.
This series of slip couplings is designed for long life under continuous slip conditions. The useful life of these elements is a function of the transmitted torque and slip speed.
UNWIND TENSION CONTROLBrake mounted on shaft of unwind spool or bobbin.
Film
Brake
Film Unwind - Tension provided by hysteresis units.
Information required: (Example) Full diameter = 6 in. Empty core diameter = 3 in. Average tension = 1 lbf Velocity = 150 ft./min.
How to size: Avg. radius = [Full roll dia. + Empty dia.] / 4 = (6 +3) / 4 = 2.25 in. Avg. torque (lbf in.) = avg. tension (lbf) x avg. radius (in.) = 1 x 2.25 = 2.25 lbf in.
1. Select Catalog Number S90MCC-MTL37505 based on 2.25 lbf in.2. Check Operating Curve The Max. rpm occurs at the min. radius Max. rpm = Velocity / (Empty dia. x π) = (150 ft./min.) / [(0.25 feet) x π] = 191 rpm 2.25 lbf in. at 191 rpm is okay.
NIP ROLL OR PULLEY TENSION CONTROL
Coil Winding - Constant tension provided by hysteresis unit.
Information required: (Example) Pulley diameter or nip roll = 3 in. Tension = 2.5 lbf Velocity = 300 ft./min.
How to size: Torque (lbf in.) = Tension x Radius = 2.5 lbf x [(3 in.) / 2] = 3.75 lbf in.
Brake
Motor
Bobbin
Film Tensioning - Constant tensioning supplied by hysteresis unit.
ClutchMotor
1. Select Catalog Number S90MCC-MTL37505 based on 3.75 lbf in.2. Check Operating Curve Max. rpm = (300 ft./min.) / (0.25 ft. x π) = 382 rpm 382 rpm is too high for continuous duty on the S90MCC-MTL37505 unit.3. Select Catalog Number S90MCC-MTL62510
1. Select Catalog Number S90MCC-MTL37505 based on 3.75 lbf in.2. Check Operating Curve Max. rpm = (300 ft./min.) / (0.25 ft. x π) = 382 rpm 382 rpm is too high for continuous duty on the S90MCC-MTL37505 unit.3. Select Catalog Number S90MCC-MTL62510
CYCLING
Clutch
Bottle Capping - Constant torque provided by a hysteresis clutch.
Information required: (Example) Slip rpm = 350 rpm Torque = 8 lbf in. Duty cycle (% slip time of total cycle time) = 25%
How to size:1. Select Catalog Number S90MCC-MTL62510 based on 8 lbf in.2. Check Operating Curve 350 rpm is high, but as the duty cycle is only 25%, the Catalog Number S90MCC-MTL62510 is okay.
Information required: (Example) Motor hp = 1/10 hp Motor rpm = 900 rpm How to size: Torque (lbf in.) = (Motor hp x 63000) / Motor rpm = [1/10 hp x 63000] / 900 = 7 lbf in.
Chain andSprocket Drive
Motor
Material Handling - Hysteresis clutch can provide overload protection and soft start.
Sub ShaftAdapter
Motor
1. Select Catalog Number S90MCC-MTL62525 based on 7 lbf in.2. Check Operating Curve 7 lbf in. is at the upper limit of safe continuous operation, but is okay.
ADVANTAGES:No electricityNo breakaway torqueConstant torque independent of shaft (rotor) speedNo contacting or wearing partsNo friction elements – same smooth torque year after yearNo magnetic particles to leak or contaminate end productOperable in some of the most difficult environmentsBrake (with shaft) and clutch (with hollow shaft) availableCustom designs available
APPLICATIONS:Fig. 1 As a CouplingThis is for load protection or torque limiting. The coupling style unit is directly connected to a motor and turns at the same speed as the motor until the torque is reached. At this point it will slip and still generate the maximum torque.
Fig. 2 As a ClutchThe unit is connected to a motor by a timingbelt or gear. The housing is driven and theshaft is the output end.
Fig. 3 As a Payout BrakeBrake is stationary and the reel or materialis fitted to the output shaft. The tension onthe material will vary with the diameter.
HOW THEY OPERATE:For Maximum TorqueAll important internal clearances are ground to tolerances of less than .001 in. (0.025 mm). Magnet assemblies surround hysteresis assembly. When like poles face each other, they produce maximum magnetic saturation of the hysteresis disc, forcing lines of flux to travel circumferentially through the hysteresis disc.
For Minimum TorqueWhen opposite poles face each other they produce minimum saturation of the hysteresis disc. The lines of flux travel through the hysteresis disc.
Combinations of adjustment angles between the two extremesgive infinite adjustability. Because there are no contacting surfaces, the setting can be maintained indefinitely.
HOW TO USE THE CURVES:Find the slip rpm on the X-axis and the torque on the Y-axis. Notice the areas that represent safe, continuous duty; intermittent duty, such as five minutes on, five minutes off; and the area which is not recommended. Operating above that line for any period of time will cause overheating and possible damage to the unit.
FEATURES: Ideal for indexing, backstopping or overrunning operations. Free rolling one way, drives in opposite direction. Lightweight, low profile. High indexing frequency, up to 4 CPS. Minimum backlash.
SHAFT REQUIREMENTS:Shaft surface hardness must be Rc 58 min.
WHAT IT DOES: Transmits torque load in one direction.Overruns freely in opposite direction. Either shaft or housing can be driving member.
HOW IT WORKS: Rollers wedge between shaft and outerrace. Positive wedging forces preventslipping. Springs position rollers for instantaneous lockup.
FOR NEEDLE ROLLER CLUTCH PRESSBEARINGSUNIDIRECTIONAL DRIVENONALIGNING
INSTALLATION: 1. Punch or drill and ream a hole of diameter A in panel as specified in the table below. Panel hardness Rb 65 max.
DO NOT DEBURR OR BREAK EDGE OF HOLE.
2. Place bearing assembly in hole. The slight interference fit assures centering the assembly in the mounting hole. 3. Using an anvil with diameter N, a minimum depth of O and a Press Tool diameter of P, install the bearing assembly into the panel by constantly applying a force of F, per the table, until the assembly is flush with the panel surface. DO NOT USE HAMMER BLOWS!
FEATURES:Torque proportional to input current. Torque virtually independent of slip speed.Smooth stable, noise-free operation.Long-life no-wearing components.Maintenance-free.Infinitely adjustable.
APPLICATIONS:Tensioning of wire, cable, films, paper, etc.Positioning of fuel flow controls, film processorsBraking for motors and dereelingLoad simulation for motor testing, fuse testing, etc.
OPTIONS:Nonstandard coil voltages Special mounting configurationsModified shafts
Hysteresis clutches provide an efficient, smooth, electrically controllable link between a motor and a load. While pre-senting integral ball bearing supported input and output shafts, the clutch features a field (electromagnet) assembly that is prevented from rotating by fixing to a bulkhead. When the coil is energized, the input and output shafts are coupled by magnetic fluxes, thus driving the load. The torque transmitted is proportional to the current supplied to the device.
TORQUE AS A FUNCTION OF INPUT CURRENT:
When a field setting is approached from zero current, it will produce less torque than if approached from prior current because of residual magnetism. Accurate and repeatable torque outputs are delivered when the setting is approached from the same direction.
APPLICATION EXAMPLE:To select a brake to tension a 7-inch (178 mm) diameter pay-off reel in a system requiring total (web or strand) tension of 2 lbf (8.9 N) and a process speed of 600 FPM.
BRAKE TORQUE (T) = Force (F) X Radius (D/2) T = 2 lbf (8.9 N) X 3.5 in. (88.9 mm) = 7 lbf in. (791 Nmm) or T = 32 ozf X 3.5 in. (88.9 mm) = 112 ozf in.
SLIP SPEED (rpm) = linear velocity (V) (in./min.) / circumference (in.) or linear velocity (V) (mm/min.) /circumference (mm) rpm = 600 ft./min. X 12 / (π X 7 in.) or (183 m/min. X 1000) / (π X 178 mm) rpm = 327
ENERGY (W) = Energy Dissipation requirement is calculated using basic DISSIPATION horsepower formula X 746 watts/hp W = (T (lbf in.) X rpm / 63025) X 746 or (T (Nmm) X rpm / 7145221) X 746 W = (7 lbf in. X 327 rpm / 63025) X 746 = 27 watts or (791 Nmm X 327 rpm / 7145221) X 746 = 27 watts
Total Web/strandTension (F)
Velocity/Feed Rate (V)
HysteresisBrake
Full RollDia. (D)
3.77.5 15 22
3775 150 225
373746 1500
22503730
ozf in. lbf in.
1600 100
400
200
120
32
16
8
2.52.01.6 .1
10
1
.005
.01 .02 .03
.05
.1 .2 .3 1 2 5.0
.5 3
rpm100
200
400
800
1200
rpm172
5
3450
6000
12000
24000
example
WATTS
HORSEPOWER
Quick Check: The curves to the leftcan be used as a quick check to verify the kinetic power calculation. Simply locate the required torque on the vertical axis, move horizontally until you intersect the appropriate speed line, and then read vertically (up or down) to obtain the resulting watts or horsepower.
Selection: From the data on the fol-lowing pages it can be seen that an S90HYB-120024 Hysteresis Brake which has a rated torque of 120 ozf in. (847 Nmm), a maximum speed capability of 12000 rpm, and an energy dissipation ca-pability of 75 watts continuous, would be the proper selection for this application.
Note: In a clutch application, slip speed is the difference in rotational speed between the input and output members of the clutch assembly. In the above example, tensioning was being accom-plished with a clutch inserted between a take-up reel and a motor driving at 500 rpm. The actual slip used to compute the energy dissipation requirements would be 500 rpm (clutch input speed) - 327 rpm (clutch output speed = 173 rpm). This dif-ference in speed would obviously impact the result for energy dissipation.
Determine clutch or brake torque valueWith the inertia value calculated, determine the torque requirement for the function.
A) For Overrunning and Start-Stop(random start-stop)
Where:T = Torque required from wrap spring, lbf in.WR2 = load inertia, lbf in.2 rpm = shaft speed at clutch locationt = time to engagement (.003 for clutch), sec.
Frictional (drag) torque is the torquenecessary to overcome static friction. It may be measured by a spring-scale or by dead-weights, applied to a known moment arm so gradually as to make inertia negligible. It is that torque found just sufficient to induce motion.
Calculate load inertia (WR2)Use the inertia chart to determine the inertia of the application components. To determine WR2
of a given shaft or disc, multiply the WR2 from the chart by the length of shaft or thickness of disc in inches.
NOTE: For hollow shafts, subtract WR2 of the I.D. from the WR2 of the O.D. and multiply by length.
In order to calculate the inertias of components which are made of material other than steel, use the multipliers found in the conversion chart (below) to establish the inertias of these components.
Inertia Conversion Chart In order to determine the inertia of a rotating member (shaft, disc, etc.) of a material other than steel, multiply the inertia of the appropriate steel diameter from the chart by:
Material Multiplier
Bronze 1.05Steel 1.00Iron .92Powdered Metal Bronze .79Powdered Metal Iron .88Aluminum .35Nylon .17
= Time to engage (TTE) (Electrical build up and collar movement and spring wrap time). = Time to speed (TTS).
T3 = Time to zero (TTZ) (Load and speed dependent).
CHARACTERISTICS OF DISENGAGEMENTControl collar release time (ADT) is affected somewhat by speed, load, and the operational performance. The electrical circuit, however, has a major impact on the clutch disengagement performance. Voltage transients and bleed down time should be minimized. The optimum suppression network for an application using the clutch is represented
ShaftFlange
HubControlCollar
by circuit C which incorporates a 1N4004 series diode and a 12V zener. Omitting the zener (circuit B) would result in a less expensive circuit but at the expense of minor decrease in performance. Circuit A represents the quickest disengagement time but provides no protection for voltage transients.
MAGNETICALLY ACTUATED CLUTCHESPrinciples of Operation:
Clutch OperationThe inside diameterof the spring is larger than the outside diameter of the shaft hub. One end of the spring (control tang) is fastened to the control collar (or armature). When the coil is de-energized, the hubs rotate independently of each other. The free hub (affixed to the spring), the spring, and the collar rotate as a unit. The opposing shaft hub is not fastened to the spring and rotates as another unit. The coil housing is stationary and piloted on the shaft bearing. A ground pin placed in the retaining tab secures the coil hous-ing from rotating.
When the coil is energized, the control collar is pulled and heldagainst the shaft flange. The mo-mentary relative motion between spring and hubs "wraps" the spring, coupling the two hubs posi-tively. All torque is transmitted through the wrapped spring. Magnetic force is only necessary to maintain a tight spring grip for total torque transfer.
UL Class H insulation system,epoxy sealed for efficient operation in extreme environments
Spline-drive construction withstands high impact stresses imparted by servo systems
Through holes for internal/external/reversible mounting flexibility
Power-Off Brake – S90SB9- series
Case Assembly
Armature Assembly
Load
Shaft BearingSupport Required
Shaft
Prime Mover
Option 1: Single Output Shaft Option 2: Double Output Shaft
Load Prime Mover
Shaft #1 Shaft #2
Case Assembly
Armature Assembly
Used to stop or hold a load in the absence of power. The case assembly is mounted or fastened to a bulkhead. The armature assembly is attached to the rotating load.
ZERO DRAG WHEN DE-ENERGIZEDANTI-BACKLASH WHEN ENERGIZED
COIL DATA:Voltage: 24V DC
Other voltages available on special order.
* Typical torque after burnishing; units shipped burnished.** For Catalog Number: -11A04, initial working air gap at installation shall be .004/.009. -17A04, -22A06, -26A06, -26A08 initial working air gap at installation shall be .006/.013. -30A10, 30A12, initial working air gap at installation shall be .008/.018.
Other voltages and dissimilar bore combinations are available on special order.
* Typical torque after burnishing; units shipped burnished.** For Catalog Number: -11A0404, -11A0505, initial working air gap at installation shall be .004/.009. -15A0404, -15A0505, -17A0404, -17A0505, initial working air gap at installation shall be .004/.009. -22A0505, -26A0606, -26A0808, initial working air gap at installation shall be .006/.013. -30A1010, initial working air gap at installation shall be .006/.013.∆ Keyway not available in rotor.§ No knurl available; S90CS9-26A supplied with (3) #8-32 holes on a Ø1.375 B.C. S90CS9-30A supplied with (3) #8-32 holes on a Ø1.750 B.C.
Other voltages and dissimilar bore combinations are available on special order.
* Typical torque after burnishing; units shipped burnished.** For Catalog Number: - 11A0404,17A0404, initial working air gap at installation shall be .004/.009. - 22A0606, 26A0606, 26A0808, initial working air gap at installation shall be .006/.013. - 30A1010, 30A1212, initial working air gap at installation shall be .008/.018.∆ Keyway not available in rotor.
* Typical torque after burnishing; units shipped burnished.** For Catalog Number: -11A0404, initial working air gap at installation shall be .004/.009. - 15A0404, -17A0404, -22A0606, -26A0606, -26A0808, initial working air gap at installation shall be .006/.013.∆ Keyway not available in rotor.§ No knurl available; S90CF9-26A supplied with (3) #8-32 holes on a Ø1.375 B.C.
Other voltages and dissimilar bore combinations are available on special order.
Catalog Number
INCH COMPONENT
RBore
EnergyDissipationlbf ft./min.
RotorInertia
lbf in. sec2
ArmatureInertia
lbf in. sec2
Max.Wattage
Static Torquelbf in.
Disengagementmsec
Engagementmsec
Armature
1080
59.5
2952600
2235
.250
.3758
156.6 x 10-5
8.10 x 10-55.0 x 10-5
64.0 x 10-5S90CFC-15A0404S90CFC-26A0606
*
∆ To be discontinued when present stock is depleted. * Typical torque after burnishing; units shipped burnished.NOTE: Initial working air gap at installation shall be .006/.013.
These units are positive drive slip clutches which provide accurate overload protection in many mechanical power transmission systems. When a jam-up or excess over-load occurs, these units disengage motor drives.
When load exceeds the rating determined by precision tem-pered torque springs, the unit's drive key pivots out of a slot to disengage the slip clutch. Once the overload is removed and speed reduced, the unit resets itself automatically.
Steel springs within the unit force metal slides against each side of a hardened cast steel pawl, holding it rigid with one end seated in a detent on the outer drive housing.
During normal machine operation, power transfers into the central assembly through the rigidly held pawl and then rotates the outer drive housing and the driven shaft to which it is connected. If a jam-up or some other malfunction causes an unacceptable load to occur, excessive torque on the pawl overpowers the springs and the pawl rotates out of its detent. Thus, the central assembly is disconnected from the outer drive housing.
Once the overload is removed and speed reduced, the torque springs automatically expand to force the pawlback in its detent. This automatic resetting action engagesyour drive shaft and puts the entire drive system back intomotion at its original angular position.
Instant Actuation
Fast, Automatic Resetting
The Actuating Pin Assembly is a simple pin which is forced out radially from the the main body when overload occurs. When using this option, it is important to note that the housing or external mounting hub end of the unit is the power source or input end. This part of the unit must continue to rotate for the extended pin to contact a customer-supplied limit switch for shutdown or warning.
Shaft-to-Shaft Mount Slip Clutch Through Shaft Mount Slip Clutch
HOW TO SELECT:1. Note shaft diameter and length. The shaft must extend through the complete unit. The drive or driven component will be mounted on the long hub.2. Determine required torque.
** To order model with actuating pin, insert “P” in box at the end of the catalog number (next page).
THROUGH SHAFT MOUNT SLIP CLUTCHES
WITH BUSHINGOPTIONAL ACTUATING PIN
MATERIAL:Housing - Heat-Treated 1215 Steel, Black OxideBushing - Bronze
FEATURES:Quick and easy installation.Tamper resistant.Automatic reset.Provides overload protection in mechanicalpower transmission systems.Dependable performance in dusty, humidand oily environments.
Other torque ratings available on special order.
OPTIONAL ACTUATING PIN: The actuating pin assembly is a simple pin which is forced out radially from the main body when overload occurs. When using this option, it is important to note that the housing (B* bore) hub end of the unit is the power source or input end. This part of the unit must continue to rotate for the extended pin to contact a customer-supplied limit switch for shutdown or warning.
∆ To order model without actuating pin, use catalog number as is. For actuating pin, insert “P” in box at the end of the catalog number.
NOTE: Supplied with standard keyways as follows: .125 x .062 for .500 bores .187 x .094 for .625 & .750 bores .250 x .125 for 1.000 bores For square keys.
FEATURES:Quick and easy installation.Tamper resistant.Automatic reset.Provides overload protection in mechanicalpower transmission systems.Dependable performance in dusty, humidand oily environments.
Other torque ratings available on special order.
NOTE: The actuating pin assembly is a simple pinwhich is forced out radially from the main bodywhen overload occurs. When using this option,it is important to note that the housing (B* bore)end of the unit is the power source or input end.This part of the unit must continue to rotate forthe extended pin to contact a customer-suppliedlimit switch for shutdown or warning.
HOW TO SELECT:1. Note bore size.2. Determine required torque. The shaft-to-shaft slip clutchis bidirectional; there-fore the input of the unit is not important unless equipped with anactuating pin assembly.
∆ To order model without actuating pin, use catalog number as is.For actuating pin, insert “P” in box at the end of the catalog number.* Supplied with set screws. All others are supplied with keyway.
FEATURES:Magnetic engagement without movement ofmechanical parts.Smooth and silent.No backlash.Nearly linear torque vs. current.No friction surface to wear out.Ultrafast response.Low output inertia.High torque-to-size ratio.Infinitely adjustable torque.
APPLICATIONS:TensioningStepping and IndexingOverload ProtectionMotor TestingControlled Start / Stop
HOW THE UNITS WORK: The output disk/shaft assembly does not touch the housing. The gap in between is filled with a fine, dry stainless steel powder. The powder is free flowing, until a magnetic field is applied from the stationary coil. The powder particles form chains along the magnetic field lines, linking the disk to the housing. The torque is proportional to the magnetic field and, therefore, to the applied D.C. input current. Output torque is controlled by varying the D.C. input current. The torque vs. current curve is essentially linear, with a slight "S" shape.
While the input torque is less than the output torque, the brake or clutch won't slip. For brakes, the output shaft won't rotate. For clutches, the input shaft will be coupled to the output shaft, with no slip.
When the input torque is increased, the brake or clutch will slip smoothly at the torque level set by the coil input current. Output torque is independent of slip rpm.
NOTE: See Accessories and Power Supplies on page 13-50 thru 13-53.
* For input side see View A, threaded mount holes “K” are at output end only. This assembly is supplied with housing solder terminals with leads attached and with 3 mounting clamps for #4-40 screws on Ø1.72 B.C.** Shaft has 3/16 Keyway at 90° from flat (both ends)∆ C Tolerance +.000 / -.002
* 6 ea. #1-72 on .906 B.C.* 3 ea. #6-32 on 1.350 B.C.3 ea. #6-32
on 1.350 B.C.3 ea. #6-32
on 2.203 B.C.3 ea. #6-32
on 2.000 B.C.4 ea. #10-32 on 3.000 B.C.4 ea. #10-32 on 4.228 B.C.4 ea. #10-32 on 4.228 B.C.4 ea. 1/4-20
on 4.812 B.C.
* One side only ∆ 3.187 on H side ** 3/16 keyway & flat, 90° oriented in respect to the keyway on the end of the shaft.◊ Supplied with housing solder terminals with leads attached.
The power supply is suitable for all magnetic particle brakes & clutches. The power supply is a constant current type, with a 3/4 turn potentiometer for setting output current from 0 to 100%.
Catalog Number
INCH COMPONENT
For Use With
S90MPS-24MC0 – 10 Volt input signal &
Follower Arm Potentiometer
NOTES: 12V DC output is available on special order.110V AC input is standard.220V AC input is available on special order.
DESCRIPTION: 1 Percent Rated Current Potentiometer. 2 MAX. SPAN - Potentiometer, sets the 100 percent output current. 3 POWER ON LIGHT. 4 MIN. SPAN - Potentiometer sets the zero output current. 5 LIQUID CRYSTAL DIGITAL AMMETER: 3-1/2 digits - current in mA 6 TERMINAL STRIP FOR - DC output, Ground, 0 – 10 Volt input signal, Follower Arm Potentiometer. 7 AC INPUT, AC POWER ON/OFF SWITCH - Input Fuse 1 amp.
The output current can also be controlled with a 0 – 10 Volt input signal. The SPAN adjustments set maximum and minimum current levels.
DESCRIPTION: 1 SWITCH - To select the method of controlling the output current: Position (1) The percent Rated Current Potentiometer; Position (2) The 0 – 10V DC Input signal. 2 MAX. SPAN - Potentiometer, sets the 100 percent output current. 3 MIN. SPAN - Potentiometer, sets the zero output current. 4 INPUT CONNECTOR - AC input and ground (earth) - see right. 5 OUTPUT CONNECTOR - For brakes & clutches, 0 – 10 volt input. 6 AMMETER CONNECTOR - For (optional) L.C.D. ammeter. 7 OUTPUT FUSE - 2 amp, 5 x 20 mm 8 12 or 24 VOLT SELECTOR SWITCH - Slide the switch towards 12 when using a 12 volt brake or clutch. Slide towards 24 when using a 24 volt unit. 9 REMOTE SWITCH - To select the “On-board Span Max. Potentiometer” or a “Remote Span Max. Potentiometer” 10 REMOTE CONNECTOR - For a “Remote Span Max. Potentiometer” (for tension adjustments when using the Follower Arm Potentiometer).
SW2Remote
1 2
7-7/8
4
1.0
.43
6.96
2.92 5.9
8 2 9 1 3
10
Top View
SW3
1224
6
7
5SW1
OUTPUT CONNECTOR 0 – 10 VOLT CONTROL
AMMETERBRAKE
OR CLUTCH
0-10 VOLTSIGNAL
(for set up only)
OUTPUT CONNECTORMANUAL (Potentiometer) CONTROL
(for set up only)
AMMETERBRAKE OR
CLUTCH
NO CO
NNEC
TION
- +D.C.OUTN
(0v 10+)
- +D.C.OUTIN
(0v 10+)
NO CO
NNEC
TION
ORAN
GE
YELL
OWW
HITE
CW
% RATEDCURRENT
POTENTIOMETER
5
5
GROUND
110 VOLTS AC
0 VOLTS
INPUT CONNECTOR
230V
110V0
230 VOLTS AC
or
4
NOTES: 12V DC output is available on special order.110V AC input is standard.220/230V input is available on special order.
DESCRIPTION: MAINTAIN CONSTANT TENSION - The follower arm potentiometer is used to maintain constant tension when using a brake for producing unwind (payout) tension, or when using a clutch for rewind tension.
APPLICATION:The arm rides on the roll, measuring the roll diameter. As the roll size decreases, the armmoves downward, rotating the potentiometer shaft. The power supply current automaticallydecreases, which decreases the brake (or clutch) torque to maintain constant tension.
SPECIFICATIONS: Resistance: 500 Ω Electrical Angle: 65° Mechanical Angle: 360° (No Stops) Maximum Drag Torque: 4 ozf in.
POWERSUPPLY
FOLLOWER ARMPOTENTIOMETER
110/220VOLTS AC
BRAKE
1.750 B.C.BOTH ENDS
#6-32 THREAD3 HOLES EQ. SPACED,BOTH ENDS
1-1/2Ø1-3/8
Ø.3750
1/2
4-5/8
.062
Ø2-1/16Ø1-3/8
2- 5/8
6 FOOT CABLE
+.0000 -.0005
1-5/8
3/4
12
Ø5/16
CLAMP & ARM(INCLUDED)
Ø.375
1/2
NOTE: Connects to Sterling Instrument power supplies. To order power supply shown above, use Catalog Number: S90MPS-24MCF.
DESCRIPTION: MAINTAIN CONSTANT TENSION - The Ultrasonic Sensor is used for maintaining constant tension when using a brake for producing unwind (payout) tension, or when using a clutch for rewind tension. When the target is within range, the LED Status Indicator glows continuously.
MATERIAL:Housing - Polyester
VOLTAGE:24V DC
OPERATING TEMPERATURE:+14°F to +140°F (-10°C to 60°C)
APPLICATION: The sensor measures the diameter of the roll and sends a 0 – 10V DC signal to the power supply. Torque is automatically varied as roll size changes, to keep tension constant. The sensor measures distances by sending an ultrasonic pulse of sound, and then measuring the time for the return echo pulse.
SPECIFICATIONS: Power Input: 15 – 30V DC, 35 mA Max. * Range: 3.9 – 39.3 in.∆ Output Resolution: 0 – 10V DC Repeatability: .02 (0.5 mm) Resolution: .012 (0.3 mm)
