System and method for permanent magnet motor control
First Claim
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1. A method of operating an electric motor, the method comprising:
- starting the electric motor in an open loop control mode;
using an estimator module, estimating derivatives of total flux linkages of the electric motor based on measured currents of the electric motor, an output speed of the electric motor, a commanded speed for the electric motor, and voltage commands for the electric motor;
while the electric motor is in the open loop control mode, evaluating derivatives of the total flux linkages of the estimator module;
in response to the evaluation of the derivatives of the total flux linkages, determining whether the estimator module has converged;
in response to a determination that the estimator module has not converged within a predetermined period of time after starting the electric motor, signaling a first fault condition; and
in response to the signaling of the first fault condition, at least one of;
(i) shutting down the electric motor; and
(ii) restarting the electric motor.
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Abstract
A method of operating an electric motor is disclosed. The method includes: starting the electric motor in an open loop control mode; operating an estimator that estimates operating conditions of the electric motor; and, while the electric motor is in the open loop control mode, evaluating a first parameter of the estimator. The method further includes: in response to the evaluation of the first parameter, determining whether the estimator has converged; and in response to a determination that the estimator has not converged within a predetermined period of time after starting the electric motor, signaling a first fault condition.
355 Citations
19 Claims
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1. A method of operating an electric motor, the method comprising:
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starting the electric motor in an open loop control mode; using an estimator module, estimating derivatives of total flux linkages of the electric motor based on measured currents of the electric motor, an output speed of the electric motor, a commanded speed for the electric motor, and voltage commands for the electric motor; while the electric motor is in the open loop control mode, evaluating derivatives of the total flux linkages of the estimator module; in response to the evaluation of the derivatives of the total flux linkages, determining whether the estimator module has converged; in response to a determination that the estimator module has not converged within a predetermined period of time after starting the electric motor, signaling a first fault condition; and in response to the signaling of the first fault condition, at least one of;
(i) shutting down the electric motor; and
(ii) restarting the electric motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A control system for an electric motor, the control system comprising:
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an estimator module that estimates derivatives of total flux linkages of the electric motor based on measured currents of the electric motor, an output speed of the electric motor, a commanded speed for the electric motor, and voltage commands for the electric motor; and a rotor check module that; commands operation of the electric motor in an open loop control mode at startup of the electric motor; while the electric motor is in the open loop control mode, evaluates the derivatives of total flux linkages of the estimator module; in response to the evaluation of the derivatives of total flux linkages, determines whether the estimator module has converged; and in response to a determination that the estimator module has not converged within a predetermined period of time after starting the electric motor, signals a first fault condition and at least one of;
(i) shuts down the electric motor; and
(ii) restarts the electric motor. - View Dependent Claims (19)
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Specification