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DRV8214: Whether the torque is changing while the speed is being adjusted

Rhea Gao
Expert 2580 points
Part Number: DRV8214

Hi,

Please take a look at the following problems. The customer is considering how to keep the torque unchanged while regulating speed, instead of decreasing the torque as the speed decreases and increasing the torque as the speed rises.

In the speed regulation mode, is the voltage at both ends of the motor stable or changes with the speed change?

If the voltage is changing, is the motor torque also changing, the lower the speed, the smaller the torque?

Thanks~

  • 0
    TI__Mastermind 23421 points

    Hey Rhea,

    I am a little confused by the question - it seems like using a normal control mode (Fixed off time or cycle by cycle) would be better for this constant torque application instead of speed regulation.  I don't think you can have a dynamic load with constant torque and speed - one of the two needs to change. 

    Speed regulation runs a loop trying to maintain the set speed.  So if a load is applied the speed will momentarily dip, then the device will sense that its speed is below target speed and will increase output PWM to try to "catch up" to the target speed, thus increasing output torque.  

    Apologies if that doesn't fully answer your question, could you clarify if not?  

    Best,

    Jacob