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DRV10983Q1EVM: I want to know the reason why the difference of rpm is occurred on same pwm duty

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Part Number: DRV10983Q1EVM

hello i am sung myung working for amotech co.

I am turning the drive ic.

and i recognize that the difference rpm is occurred with same pwm duty signal on the motor.

When i ratate motor with 20% pwm duty first. motor's rpm is 800. and then i increase pwm duty up to 90%. motor's rpm is increased up to 2800.

and i reduce pwm duty down to 20% again. but motor's rpm is 1400

i want to know the reason which make difference between first rpm and second rpm with same PWM duty(20% duty).

and then I will be appreciated by getting the way to solve this problem.

thank you


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