173
User Defined Motors
Note
When using an oscilloscope, use the following formula to determine the motor velocity in
RPM.
Use the following formula to determine the Ke of the motor after the voltage and speed
measurements.
Motor Pole Count
To determine the number motor poles, measure the number of electrical revolutions per
mechanical motor revolution. The number of poles in the motor is two times the number of
electrical cycles (360 degrees) per mechanical revolution. Use the following procedure:
1. Attach a scope probe to the R winding referenced to the S winding and one to the encoder
Z channel referenced to the encoder power supply 0 volt.
2. Connect S winding to the encoder power supply 0 volt wire thereby connecting the scope
ground clips together.
3. Set the scope up to trigger on the Z channel.
4. Rotate the motor in either direction at any speed.
Note
If you are using an electric drill to rotate the motor, the drill’s name plate should specify
the maximum RPM.
5. Adjust the horizontal time base until at least two Z channel pulses are visible.
6. Count the number of full cycles of the Motor waveform you see between the rising edges
of the Z pulses.
volutionsSeconds/Re
60
RPM =
RPM
VRMS
1000 Ke =
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