MCF8316C-Q1: Fault occur speed loop saturation and current loop saturation when enter close loop

seongjin kim

Part Number: MCF8316C-Q1

Tool/software:

hi i test BLDC motor by MCF8316AEVM(MCF8316C-Q1)

i was success control other motor, but new motor control is failed by equal setting(migration motor resistance, inductance, back-EMF, max speed/current)

my problem is motor sequence as soon as entering close loop, motor current and speed saturated but i controlled 25%

i tried under case

1. Closed loop - SPD_LOOP_KP, SPD_LOOP_KI set 0 - re-calculation coefficient

2. Closed loop - SPD_LOOP_KP, SPD_LOOP_KI set 1 - min value (0.00001 / 0.0001 set)

3. Closed loop - CL_ACC, CL_SLOW_ACC, CL_DEC -> set 1Hz

but nothing has changed

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"value":"0x64B12498",
"addr":"0x00000080"
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"id":"PERI_CONFIG1",
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"id":"GD_CONFIG1",
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{
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"id":"CURRENT_PI",
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{
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"id":"SPEED_PI",
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"id":"PHASE_VOLTAGE_VB",
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"id":"SPEED_FDBK",
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"id":"THETA_EST",
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}

Maxon Motor_ECXSP16M BL KL A HP 24V_44.pdf

please help me thank you

3 months ago

0 Venkatadri Shantaram84961 3 months ago

TI__Mastermind 24412 points

Hi,

Thanks for sharing details, I will look into this.

Have you looed at SmartTune feature added in the motor studio ver 0.1.30?

On the product landing page there is a demo video of SmartTune, please verify that.

Thanks and Best regards

Venkatadri S

0 seongjin kim 3 months ago in reply to Venkatadri Shantaram84961

Prodigy 10 points

yes, motor studio ver 0.1.30

and MPET, SmartTune had success but not solved

i will more try to other test

thank you for reply

0 Venkatadri Shantaram84961 3 months ago in reply to seongjin kim

TI__Mastermind 24412 points

Can you share JSON generated by SmartTune?

Thanks and Best regards

Venkatadri S

0 seongjin kim 3 months ago in reply to Venkatadri Shantaram84961

Prodigy 10 points

hi, my updated file was SmartTune completed

and i solved control saturation problem by AVS function disabled

why saturated control(speed, current) when AVS enable i don't know

additionally i find a strange point

motor running to open loop, B-EMF is lowest, but when close loop enter B-EMF is highest

i think higher B-EMF influence close loop feedback, so motor strange running (and because high B-EMF at close loop, motor too much vibration at same RPM as open loop)

why B-EMF highest at enter close loop?

please idea.. thank you

0 Venkatadri Shantaram84961 3 months ago in reply to seongjin kim

TI__Mastermind 24412 points

I will verify tuning file and get back.

What is the open loop speed and closed loop speed when you see vibration?

Thanks and Best regards

Venkatadri S

0 seongjin kim 3 months ago in reply to Venkatadri Shantaram84961

Prodigy 10 points

hi,

both cases speed is same, for example i set open loop threshold 150Hz, and close loop disable so motor running clearly but enter close loop and speed 150Hz is too much vibration, other speed(lower or higher) same situation

i want AVS enable for safety

thanks and best regards

0 Venkatadri Shantaram84961 3 months ago in reply to seongjin kim

TI__Mastermind 24412 points

This motor is high speed, low BEMF.

What is the load type for this motor?

For small excitation motor is reaching to full speed and further torque command is not accepting.

You need to test this motor with load and the re turn the speed loop.

Speed KP, KI is not proper and it can cause settling, transit issues.

Test by disabling the speed loop and test?

Thanks and Best regards

Venkatadri S

0 seongjin kim 3 months ago in reply to Venkatadri Shantaram84961

Prodigy 10 points

hi, my test environment motor was no load state

i retry to your advice and solved but not clearly

1. MPET re-calculation, open loop ACC setting change to 10Hz

2. speed KI, KP lower

so now, i can control motor speed 30Hz~850Hz with vibrationless

but i curious why if i enable AVS, motor remain speed saturation to max speed

i think problem not complete clearly so i warry

tanks your reply

0 Venkatadri Shantaram84961 3 months ago in reply to seongjin kim

TI__Mastermind 24412 points

Hi,

In speed loop with AVS mode enabled, when we decelerate from high speed to low-speed saturation flag will set until speed reaches to the set reference.

Can you share current and speed at which saturation is set ?

Thanks and Best regards

Venkatadri S

0 seongjin kim 3 months ago in reply to Venkatadri Shantaram84961

Prodigy 10 points

hi,

i set motor max speed 850Hz, and speed saturation reaches to 850Hz, at this time current is 0.3A (No Load)

and my situation, i set reference speed 150Hz, first open loop reaches to 150Hz and close loop enter so motor many fast accelerate to saturation(850Hz)

(might 3 second)

thank you

0 Venkatadri Shantaram84961 3 months ago in reply to seongjin kim

TI__Mastermind 24412 points

This motor without load can reach to max speed with 0.3A.

If you are looking for speed control reduce ILIMIT to 0.5A and test again.

For 1A 25% corresponds to 250mA (assuming linear char).

Thanks and Best regards

Venkatadri S

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MCF8316C-Q1: Fault occur speed loop saturation and current loop saturation when enter close loop