More on the deflect-o-meter results

6-30-06

Node 76898

Node 76307

X direction

How Deflection is measured (known location)

Test case is 36.5 kamps/turn

Model does not account for the overstocked condition of the winding form/tee.

Legs in this model are simple extrusions from the casting

Locked post

Mounting location

all legs fixed Real Pads-200 uE 0 uE 400 uE 800 UE 400 uE 400 uE

node ux ux ux ux ux ux48970 -3.93E-05 -3.29E-06 9.28E-05 1.27E-04 -4.32E-06 1.71E-0376307 3.91E-04 4.57E-04 6.32E-04 6.68E-04 3.18E-04 2.24E-03

all legs fixed Real Pads-200 uE 0 uE 400 uE 800 uE 400 uE 400 uE

Deflection (mm)

0.429913 0.4599523 0.539362 0.54112 0.3219003 0.5302

.23 mm

movement of the individual nodes (m)

Deflection

ANSYS RESULTS

Deflect-o-meter reading for 36.5 Kamps =

Results revisited with the updated location of the deflect-o-meter

Real Pad updated model showing the deflect-o-meter path

Deflection vs differential strain

0.4

0.42

0.44

0.46

0.48

0.5

0.52

0.54

0.56

-200 0 200 400 600 800 1000

differential strain

De

fle

cti

on

(m

m)

Restraints Again

One post fixed, three posts sliding on a plane

All posts fixed in all directions

In both cases, the left front leg (north-west when viewed from above) is treated as always touching the floor. What if that leg actually moved up and the coil was essentially supported on a tripod.

The magnetic field tends to want to push that leg off the floor (see the red area on the figure on the right). By supporting it as I have here, I am forcing the coil to move and bend to accommodate my displacements, an unwanted effect.

Deflect-o-meter prediction = .54 mm Deflect-o-meter prediction = .32 mm

Picture of how leg is held vertically

It is unclear from this view how the top plate, which is intended to restrict lateral movement, is touching the support vertically or if there is a gap of some size.

Even if the leg is touching the plate, the plate is probably not suitable to restrain all vertical movement

Leg

Top lateral support plate

Letting the north-west leg go (400 µE)

Northwest leg wants to move up and the coil is then supported by three legs

The leg moves up 4-5 mm (vertical)

For 400 uE, the deflect-o-meter ANSYS reading is 0.28 mm

400 µE

Northwest leg wants to move up and the coil is then supported by three legs

The leg moves up 4.5-5.5 mm (vertical)

For 0 uE, the deflect-o-meter ANSYS reading is 0.21 mm

Letting the north-west leg go (0 µE)

0 µE

New Updated Table

0 uE 400 uE Test # 121439 Test # 121453 Test # 121461

Deflection (mm)

0.214 0.285 0.239 0.226 0.232

ANSYS RESULTS (36.5 kamps)

Deflect-o-meter Results (36.5 Kamps)

Simple Linear trend for deflection

0.200

0.210

0.220

0.230

0.240

0.250

0.260

0.270

0.280

0.290

0 50 100 150 200 250 300 350 400 450

Differential strain between winding and shell (uE)

Def

lect

ion

(m

m) Using a simple linear trend (obviously

more points are needed), the results tend to suggest that differential strain may be less than 400 uE.