Motor operation failure detection

摘要

Systems and methods of detecting a failure of a permanent magnet synchronous motor system. A current of each phase coil of the motor is monitored. A value indicative of the power of the motor is compared to a threshold value indicative of power during a low power detection period. If the value indicative of the power fails to exceed the threshold value indicative of power for the entire low-power detection period, the system indicates a first error condition. The method also monitors the speed of the motor and indicates a second error condition if the speed of the motor remains below a speed threshold for an entire speed failure detection period. A third error condition is indicated if the current of at least one phase of the motor remains below a phase current threshold for an entire loss of phase detection period.

主权项

1. A method of detecting a failure of a permanent magnet motor system comprising:
monitoring a current of each phase of the permanent magnet motor system; repeatedly comparing a value indicative of power of the permanent magnet motor system to a threshold value indicative of power for a low power detection period; indicating a first error condition when the value indicative of power remains below the threshold value indicative of power for an entire low power detection period; estimating a current error; monitoring a speed of the permanent magnet motor system based in part on the current error; repeatedly comparing the speed of the permanent magnet motor system to a speed threshold for a speed failure detection period; indicating a second error condition when the speed of the permanent magnet motor system remains below the speed threshold for an entire speed failure detection period; repeatedly comparing the current of each phase of the permanent magnet motor system to a phase current threshold for a loss of phase detection period; and indicating a third error condition when the current of at least one phase of the permanent magnet motor system remains below the phase current threshold for an entire loss of phase detection period.