DRV10970: Issue with DRV10970PWPR – Motor Jerking and No PWM on W Phase Output

Gowthaman Devaraj

Part Number: DRV10970
Other Parts Discussed in Thread: MCT8316Z, MCT8315Z

Tool/software:

Dear TI Support Team,

I am using DRV10970PWPR to drive a sensorless BLDC motor, but I am facing an issue during startup. The motor only jerks and does not start rotating. Upon checking with an oscilloscope, I observe PWM signals on U and V outputs, but there is no PWM on the W-phase output (Pin 11).

Here are the details of my setup:

IC: DRV10970PWPR
Motor: Sensorless BLDC
Supply Voltage: [12V DC]
PWM Control Input: Arduino Nano

Observed behavior:

Motor only makes small jerks and does not enter closed-loop commutation.
U and V phases show PWM output, but W phase remains inactive.

Questions:

Is this normal behavior during open-loop startup, or does it indicate a configuration/hardware issue?
What could prevent the DRV10970 from energizing the W phase?

I have referred to the datasheet, but I would appreciate your guidance or any troubleshooting steps.

Regards,

Gowthaman

1 month ago

0 Venkatadri Shantaram84961 1 month ago

TI__Mastermind 23442 points

Hi Gowthaman,

DRV10970 is HALL sensor based driver.

If no HALL sensor device cannot commutate.

Please refer to the data sheet.

"When the DRV10970 powers up, it starts to drive the motor in trapezoidal communication mode based on the Hall sensor information. If all three Hall sensors are connected, commutation logic relies on all three Hall sensors. If only the U phase Hall sensor is connected (V_HP is floating), DRV10970 starts to drive the motor in single Hall sensor mode"

Thanks and Best Regards

Venkatadri S

0 Gowthaman Devaraj 1 month ago in reply to Venkatadri Shantaram84961

Prodigy 30 points

Hi Venkatadri,

Thanks for the response.

Kindly confirm whether the Motor driver “DRV10970PWPR” will support the BLDC Motor PN “2622s006b-8-1”.If so, please share any special requirements to be consider for connection.

Regards,

Gowthaman

0 Venkatadri Shantaram84961 1 month ago in reply to Gowthaman Devaraj

TI__Mastermind 23442 points

Hi Gowthaman,

Can you share data sheet here if you have downloaded?

Thanks and Best Regards

Venkatadri S

0 Gowthaman Devaraj 1 month ago in reply to Venkatadri Shantaram84961

Prodigy 30 points

EN_2622_B_DFF.pdf

0 Venkatadri Shantaram84961 1 month ago in reply to Gowthaman Devaraj

TI__Mastermind 23442 points

Hi Gowthaman,

I will look at the datasheet and reply by tomorrow.

Thanks and Best Regards

Venkatadri S

0 Venkatadri Shantaram84961 1 month ago in reply to Venkatadri Shantaram84961

TI__Mastermind 23442 points

Hi Gowthaman,

Can you verify MCT8315Z/MCT8316Z for this?

Thanks and Best Regards

Venkatadri S

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DRV10970: Issue with DRV10970PWPR – Motor Jerking and No PWM on W Phase Output