Wheel System, Traction 411Service Manual – CS7000
Drive Motor
The drive controller supplies current to the drive motor stator windings on the three large U, V and W wires.
When stationary, the controller pulses a current to all the motor stator windings in “unison”. This holds the
motor in a xed position. To make the motor rotate, the controller shifts the timing, duration, and current
of each of the windings. This continuously changes the location and strength of the magnetic eld poles
created by the stator windings, which causes torque to be applied to the rotor.
Below is an oscilloscope waveform that shows the 3 phases of the motor (U, V and W) when the motor is
stationary. You can see how all 3 phases are being pulsed in unison. The vertical position of each trace was
adjusted to separate them for better clarity. Other wise all three would blend together as a single trace.
Below is an oscilloscope waveform that shows the 3 phases of the motor (U, V and W) when the motor is
moving forward. You can see how each phase is now unique and no longer in unison. Again, the vertical
position of each trace was adjusted to separate them for better clarity.
WaveStar : NotesSheet(11) Page: 1
Drive Motor U,V and W - Stationary
WaveStar : NotesSheet(12) Page: 1
Drive Motor U,V and W - Moving Forward
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