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A control system for a multi-phase synchronous machine having a shaft driven at variable speed or for developing a variable torque angle includes shaft angular position detectors that derive first and second output pulses respectively representing a shaft angular displacement corresponding with each

A control system for a multi-phase synchronous machine having a shaft driven at variable speed or for developing a variable torque angle includes shaft angular position detectors that derive first and second output pulses respectively representing a shaft angular displacement corresponding with each pole of the machine and a predetermined shaft angular displacement within each pole. In response to a plurality of the second output pulses, a frequency locked loop derives a variable frequency pulse output. Individual pulses are selectively inserted and deleted from the variable frequency output to derive a variable phase pulse output representing machine torque angle. A triangle up/down counter responds to the variable phase output to derive a pulse output signal having a frequency that is a submultiple of the variable frequency output and a phase determined by the phase of the variable phase output. The time position of pulses of the first output and the up/down counter are compared to control the insertion and deletion of the individual pulses. Each phase of the machine is driven in response to the output signal of the triangle up/down counter.

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A control system for a multi-phase synchronous machine having a shaft adapted to be driven at variable output speed or a variable torque angle comprising shaft angular position detector means for deriving a first output for a shaft angular displacement corresponding with each pole of the machine and

A control system for a multi-phase synchronous machine having a shaft adapted to be driven at variable output speed or a variable torque angle comprising shaft angular position detector means for deriving a first output for a shaft angular displacement corresponding with each pole of the machine and for deriving a second output for a predetermined shaft angular displacement within each pole, means responsive to the second detector for deriving a variable frequency output determined by the frequency of the second output, means for selectively inserting and deleting one cycle from the variable frequency output to derive a variable phase output, means responsive to the variable phase output for deriving an output signal having a frequency that is a sub-multiple of the variable frequency output and a phase determined by the phase of the variable phase output, means for comparing the phase of the first output and the output signal for controlling the means for inserting and deleting, and means for driving each phase of the machine in response to the output signal.