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Markt & Technik Symposium – Electrical Drives

Andrea Ghirardello | BFG EngineeringVincent Mignard | Renesas Electronics Europe

Thursday the 10th of October 2013 Rev. 1.1

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Tune & Calibrate Your Permanent Magnet Motorin a few Mouse-ClicksIntroduction

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3 Men 3 Months €200K

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IEC 60730Safety compliance

OutstandingNoise immunity

Automatic shutdownA/D converter self-diagnosis

Running Overload detection

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How to tune & evaluate ?

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In a few clicks, the software is tuned to the custom motor and ready to run.

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External Parts Cost (€)

- Quad Op-Amp IC 0.3- PCB used by Op-Amp 0.20- Mounting & testing 0.40 TOTAL € 0.90

Royalty-free vector control sensorless software

High integration, low BOM costs, e.g. Op-amp saved up to €0.9

Available now @ €99/kit

Schematics, gerber files, BOM list available

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1 Man 1 Month €30K

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Markt & Technik Symposium – Electrical Drives

Andrea Ghirardello | BFG EngineeringVincent Mignard | Renesas Electronics Europe

Thursday the 10th of October 2013 Rev. 1.1

00000-A

Tune & Calibrate Your Permanent Magnet Motorin a few Mouse-ClicksTheory

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Where are the mysterious parameters?

Kp Ki motor specific coefficients

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MotorCurrent PIcontroller

v(t)Error ResponseReference

What is the current PI role?

)()()( tErrorKtErrorKtv ip

Kp Ki motor specific coefficients

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How to modelize the motor?

Measurement of

L/R and 1/RKp Ki

v(t)L

R

i(t)

Motor modelized

RL

t

eR

Vti /1)(

V/R

L/R

V/L

t

i

then)(1)( if tVtv

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How to find Kp and Ki?

t

v

A voltage step is applied to the motor

Step #1 Step #3

L/R and 1/R extracted

Kp and Ki calculated !Kp Ki

Step #2

The motor response is measured by the MCU

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Where are the mysterious parameters?

Rs mLs motor specific coefficients

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Which motor equations uses the Flux Estimator?

dt

diRv

dt

diRv

s

s

ms

ms

iL

iL

iRv

iRv

s

s

)( mss ILjIRV

Rs mLs motor specific coefficients

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How to find Rs , Ls and m ?

Step #2

Three motor responses measured by MCU Rs mLs

Step #3

Solve the 3 equations of 3 unknowns &

extract:Three stimulations applied to the motor

Step #1

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Rs mLs

Kp Ki

The auto-calibration is done !

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Let’s try now to tune this AC Brushless motor

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www.renesas.eu/rx62tkit