Control system for a permanent magnet synchronous motor
AssigneeAnalog Devices, Inc.
InventorRakesh Goel
Life of this patent
Estimating the term…
Abstract
A control system for a permanent magnet synchronous motor includes a position estimator means having for cross correlating the back EMF of the unenergized winding with a reference waveform to determine the estimated position of the rotor for determining rotor angle position error; an error compensator, responsive to the rotor angle position error, for determining the angular speed of the field; an angle generator, responsive to the angular speed of the field, for generating the field angle position; and a waveform generator, responsive to the rotor angle position, for generating a periodic signal corresponding to each winding and designating a segment of that signal for driving that winding to adjust the field speed to the rotor speed.
Claims9
A control system for a permanent magnet synchronous motor, comprising:
- position estimator means, including means for cross-correlating the back EMF of an unenergized winding with a reference waveform to determine an estimated position of the rotor, for determining rotor angle position error;
- error compensation means, responsive to the rotor angle position error, for determining the angular speed of the field;
- angle generator means, responsive to the angular speed of the field, for generating a field angle position;
- and
- a waveform generator, responsive to the field angle position, for generating a periodic signal corresponding to each winding and designating a segment of that signal for driving that winding to adjust the angular speed of the field to equal rotor speed.
Dependencies are inferred from the claim text.