TIDA-00436: Designing a BLDC controller to run a 24V DC motor

Cleatus Wesley

Part Number: TIDA-00436

I am designing a BLDC controller using TIDA-00436 as reference. I will be using the same set of cells as in the design and the total output voltage will be 42V when the cells are fully charged.

But instead of the 36V motor used, I will be using a 24V motor. I can understand that the current can be controller using the MOSFET bridge but, how can the voltage be stepped down? Won't the 36V from the battery pack damage my motor?

over 3 years ago

0 Jenson over 3 years ago

TI__Intellectual 2465 points

Hi ,

We recommend designing with a motor with a rated voltage equal to or greater than the current voltage. The motor may be damaged if the motor is operated at a voltage greater than the rated voltage for a long time.

Thanks.

Jenson

0 Cleatus Wesley over 3 years ago in reply to Jenson

Prodigy 220 points

1. Can I use a buck converter to step down the voltage and power the motor?

2. I need to use a 42V pack so that I can get maximum run time. If I use a battery pack equal to the motor voltage, the run time would be less. Are there any other alternatives?

0 Jenson over 3 years ago in reply to Cleatus Wesley

TI__Intellectual 2465 points

Hi ,

1.Sure,you can use buck to do it.But it should be noted that the output current of BUCK should be greater than the working current of the motor

2.We recommend working with a motor that is lower than the rated voltage of the motor.

Thanks

Jenson

0 Cleatus Wesley over 3 years ago in reply to Jenson

Prodigy 220 points

Can I step down the power to the motor by operating the MOSFETs at a suitable region that can provide the motor's rated power based on the VDS vs ID graph of the MOSFET?

0 Jenson over 3 years ago in reply to Cleatus Wesley

TI__Intellectual 2465 points

Hi，

You need to ensure that the motor is running at rated voltage, and within the power range, the motor will generally not be damaged.

Jenson

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TIDA-00436: Designing a BLDC controller to run a 24V DC motor