1 Markt & Technik Symposium – Electrical Drives Andrea Ghirardello | BFG Engineering Vincent Mignard | Renesas Electronics Europe Thursday the 10 th of October 2013 Rev. 1.1 00000-A Tune & Calibrate Your Permanent Magnet Motor in a few Mouse-Clicks Introduction
Renesas - Tune & calibrate your motor in a few mouse-clicks
Jun 14, 2015
The dream of any engineer designing a 3-phase inverter for an AC Brushless motor is to quickly get a running solution, tuned to his specific motor. An ideal design tool fulfilling this dream would enable automatic measurement of the motor parameters; ensure tuning of the system power stage; calibrate the coefficients of the Proportional/Integral current regulation block and guarantee a safe and reliable start-up process. Renesas are now offering such a dream tool as an enhancement to their existing RX62T Motor Control Reference currently available. The enhancements to the RX62T Motor Control Kit enable design engineers to plug-in and tune their own motor within a few minutes, allowing speedy and efficient system optimisation.
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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-ClicksIntroduction
2Corbis Copyright
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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 ?
Corbis Copyright
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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
Corbis Copyright
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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
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