User Manual

Table Of Contents
Sinusoidal Commutation
Advanced Digital Motor Controller User Manual 107
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22.5
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67.5
90
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90
112.5
135
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157.5
180
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Electrical Degrees
Mechanical Degrees
FIGURE 8-13. Mechanical vs electrical degrees
See “Determining the Number of Poles” on page 92 for details on how to determine the
number of pole pairs and configuring the controllers.
The number must be entered using the Number of Pole Pairs menus in the in the Roborun
PC utility..
FIGURE 8-14. Number of pole pairs configuration
Or by sending the configuration command:
^BPOL channel nn
Entering a negative number of pole pairs will reverse the measured speed and the count
direction. It is useful when operating the motor in closed loop speed mode and if other-
wise a negative speed is measured when the motor is moved in the positive direction.
Configuring Number of Sensor Poles
Single pole absolute sensors like Resolvers, sin/cos and SSI encoders typically return an
angular value that is equal to the mechanical angle. The controller then converts the mea-
sured angle into the electrical angle for its internal operation, using the formula:
Electrical Angle = (Sensor Angle * Number of Poles) modulo 360