TMS320F28379D: Relation between DC bus and Maximum motor speed

Arun Kumar

We notice that if not enough dc bus is given the speed of the motor will be capped, Could you explain the relation between the two?

For example:

Lets say I set my base speed to 250 Hz(3750 RPM for 8 pole motor)

And for 30v dc bus, if my speedRef is 1.0 pu, it reaches 3750 RPM.

But now if i reduced the DC bus to , say 20v, I will not be able to reach 3750RPM, even if the speedRef is set to 1 pu.

Could you kindly explain the relationship between dc bus and maximum speed achievable?

Thanks,

over 3 years ago

0 Sahil Deshpande over 3 years ago

TI__Expert 6035 points

The subject matter expert is out of office. Please expect a response by Tuesday.

Thanks.

+1 Yanming Luo over 3 years ago

TI__Guru** 117210 points

Arun Kumar said:
We notice that if not enough dc bus is given the speed of the motor will be capped, Could you explain the relation between the two?

There is not a specific formula for the relationship between dc bus and maximum speed achievable. The dc bus voltage must be higher than the BEMF voltage, the motor needs enough the dc bus voltage over the BEMF of the motor and to generate the torque.

0 Arun Kumar over 3 years ago in reply to Yanming Luo

Expert 1030 points

I see, Thanks for the clarification!

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28379D: Relation between DC bus and Maximum motor speed