Electric motor control
First Claim
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1. A control system for an electric motor arranged to have electrical voltages applied to the motor to generate electrical currents in the motor, the control system comprising:
- a controller that is adapted to generate electrical currents in an electric motor; and
a processor that controls the controller by performing a sensorless position determining algorithm which includes;
(1) monitoring the electrical voltages applied to the motor and the electrical currents generated in the motor,(2) determining from the electrical voltages and electrical currents a rotational position of the motor,(3) monitoring at least one estimated operating parameter of the motor generated within the sensorless position determining algorithm, and(4) using the at least one estimated operating parameter of the motor monitored by the sensorless position determining algorithm to detect a stall condition of the motor.
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Abstract
A control system for an electric motor comprises processing means arranged to perform a control process which includes monitoring electrical voltages applied to the motor and electrical currents in the motor, and determining from them the rotational position of the motor. The system is further arranged to monitor at least one parameter of the control process thereby to detect a stall condition of the motor.
88 Citations
20 Claims
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1. A control system for an electric motor arranged to have electrical voltages applied to the motor to generate electrical currents in the motor, the control system comprising:
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a controller that is adapted to generate electrical currents in an electric motor; and a processor that controls the controller by performing a sensorless position determining algorithm which includes; (1) monitoring the electrical voltages applied to the motor and the electrical currents generated in the motor, (2) determining from the electrical voltages and electrical currents a rotational position of the motor, (3) monitoring at least one estimated operating parameter of the motor generated within the sensorless position determining algorithm, and (4) using the at least one estimated operating parameter of the motor monitored by the sensorless position determining algorithm to detect a stall condition of the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A combined electric motor and control system comprising:
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an electric motor arranged to have electrical voltages applied thereto so as to generate electrical currents in the motor; and a control system including a controller that generates electrical currents in the electric motor and a processor that controls the controller by performing a sensorless position determining algorithm which; (1) monitors the electrical voltages applied to the motor and the electrical currents generated in the motor, (2) determines from the electrical voltages and electrical currents a rotational position of the motor, (3) monitors at least one estimated operating parameter of the motor generated within the sensorless position determining algorithm, and (4) uses the at least one estimated operating parameter of the motor monitored by the sensorless position determining algorithm to detect a stall condition of the motor.
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Specification