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METHOD FOR DETERMINING STALLED STATE OF PERMANENT MAGNET SYNCHRONOUS MOTOR UNDER POSITION SENSOR-FREE VECTOR CONTROL
METHOD FOR DETERMINING STALLED STATE OF PERMANENT MAGNET SYNCHRONOUS MOTOR UNDER POSITION SENSOR-FREE VECTOR CONTROL
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机译：在无传感器 - 自由矢量控制下确定永磁同步电动机停滞状态的方法
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摘要
Disclosed is a method for determining the stalled state of a permanent magnet synchronous motor under position sensor-free vector control, which comprises the following steps: step A: calculating the input power Pin and output power Pout of a motor; step B: calculating an error value ERR＝|Pin-K1×Pout|, where K is a coefficient; step C: determining whether the ERR is greater than or equal to a certain preset value P0, and if so, then returning to step A; if not, determining that the motor is in a stalled state, and proceeding to step D; step D: a microprocessor of the motor locks out a pulse signal outputted to an inverter. The described method may accurately determine a motor changing into a stalled state, and still prevents the motor from entering a steady-state closed loop state when changed into the stalled state, which enables the motor to be in a high-frequency small-amplitude oscillation state, perfects a protection strategy, effectively protects the motor, essentially solves the problem of determining the stalled state, and does not require modifications once a load is replaced, which brings great convenience to a user.
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