What is six-pulse
Posted 23 February 2005 - 03:51 PM
Posted 24 February 2005 - 08:52 AM
A CD drive operates by converting the applied AC supply to DC and either varying the magnitude of all the DC or a secondary DC supply to control the torque produced by a DC motor. The exact operation is dependant on the motor configuration.
Wehn a three phase AC supply is connected to a three phase bridge rectifier, current will flow into the rectifier from the phase with the highest voltage at any instant in time. This results in each phase in turn supplying current for a portion of each half cycle. Each phase effectively supplies a "pulse" of positive current and a pulse of negative current. This gives a total of six "pulses" per cycle.
A four quadrant drive is one that can provide acceleration torque and deceleration torque in the forward and reverse directions.
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