TMS320F28069M: Tips for maintaining motor RPM with large decrease in Vdc Bus

stomp

Genius 4615 points

Part Number: TMS320F28069M

Hi,

I have a BLDC solution where I need to maintain 10,000 RPM. The design is for a multi-volt appliance (110 / 220 VAC)

With Vdc Bus at 310VDC (220VAC input), 10K+ RPM is no issue.

With Vdc Bus at 155VDC (110VAC input), I can only achieve 7.5K RPM.

Wondering if there is an easy parameter change I can make to squeeze another 2500 RPM out of the design.?

Thanks

Stomp!

over 6 years ago

0 Yanming Luo over 6 years ago

TI__Guru** 109760 points

The maximum speed of motor depends on bemf constant of motor and input DC-Bus voltage. Please check the out duty of pwm, you maybe have to implement field weakening control to improve the maximum speed if the input dc bus voltage is not enough. What control algorithm was you using? Trapezoidal or sinusoidal FOC?

0 stomp over 6 years ago in reply to Yanming Luo

Genius 4615 points

Thanks Yanming,

I'll check out the PWM tomorrow. For now I am using sinusoidal FOC.

Thanks.

0 Yanming Luo over 6 years ago in reply to stomp

TI__Guru** 109760 points

Just wanted to check in and see if there is any update from your side. Please let me know if you have any questions. We would like to close this thread if no any further questions. Thanks.

0 stomp over 6 years ago in reply to Yanming Luo

Genius 4615 points

Thanks Yanming,

I could not achieve the extra RPM, I think we are going to get the motor maker to put some extra windings in future motors.

Thanks.

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TMS320F28069M: Tips for maintaining motor RPM with large decrease in Vdc Bus