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fireball
Associate

Join Date: Oct 2007
Posts: 48

BLDC motor speed calculation

07/18/2008 2:13 AM

Good morning!!!

I have question regarding BLDC motor controller.

How can BLDC motor speed can be calculated from Hall sensor output?

Regards!
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electrone
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Join Date: Jan 2006
Posts: 377
Good Answers: 2
#1

Re: BLDC motor speed calculation

07/19/2008 2:45 AM

Hi. The number of pulses received from a sensor divided by the number of magnets in the motor.
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fireball
Associate

Join Date: Oct 2007
Posts: 48
#2

Re: BLDC motor speed calculation

07/23/2008 4:27 AM

Hi again!

please correct me for folllwing example if it is wrong:
For 4 pole motor,
If i got one of 3 hall sensor output with frequency of 125 Hz, then speed will be:
2 pulse = 1 mechanical revolution.
So, for 125 Hz (125 pulse per second), speed = (125/2) revolution per second.
Which will give (62.5 * 60) = 3750 RPM

Am i right?
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