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Brushless motor speed how to calculate?

Time:2017-03-26 14:01:04     View:

If you want to test the speed of the brushless motor speed: there are 2 ways:
 
1 available tachometer direct test
 
2 the frequency of back EMF waveform can be calculated by using oscilloscope. Frequency / pole *60 is the speed per minute.
 
If the write speed closed loop control procedures, this is more complex. Divided into acceleration / deceleration / uniform three cases to write.
 
Generally for the continuous exchange of 12 phase /2 is a lap time (in the three-phase six polar uniform as an example).