Magnetic Pole Diagnosis Device of Permanent Magnet Synchronous Motor for Elevator

Abstract

The present invention provides a magnetic pole diagnostic device of a permanent magnet synchronous motor used for an elevator which can reduce the off-time of the elevator. The magnetic pole diagnostic device of the permanent magnet synchronous motor used for the elevator is arranged on the elevator driven by the permanent magnet synchronous motor and diagnoses the offset of the magnetic pole position, and the permanent magnet synchronous motor is controlled by a motor current of a phase corresponding to the magnetic pole position of the permanent magnet synchronous motor detected by a rotaryencoder (5), wherein the magnetic pole diagnostic device of the permanent magnet synchronous motor used for the elevator is equipped with a magnetic pole anomaly diagnosis part (14) for diagnose whether the magnetic pole is abnormal or normal based on the comparison of an initial value and a measurement value of the motor current obtained under a predetermined elevator operation state; and a magnetic pole position adjustment part (15) for correcting the magnetic pole positions when the magnetic pole anomaly diagnosis part (14) diagnoses that the magnetic pole positions are abnormal.

Description

technical field [0001] The invention relates to a magnetic pole diagnosis device for diagnosing the magnetic pole deviation of a permanent magnet synchronous motor used in an elevator. Background technique [0002] In recent elevators, a low-loss, high-efficiency permanent magnet synchronous motor is used as a drive motor. Here, the permanent magnet synchronous motor is a motor that rotates at a stable rotational speed when the rotational speed matches the frequency command. [0003] In order to output an optimum torque in a permanent magnet synchronous motor, it is necessary to flow a motor current with a phase corresponding to a magnetic pole position. Therefore, generally speaking, a rotary encoder for magnetic pole position detection is provided in the permanent magnet synchronous motor, and U, V, and W phase pulses of the rotary encoder are used to set the phase of the permanent magnet synchronous motor. [0004] When installing a rotary encoder to a permanent magnet ...

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Problems solved by technology

[0005] However, even if the optimal magnetic pole position is set once, if the shaft of the rotary encoder wears and shakes afterward, or if the magnetic pole shifts when the rotary encoder is replaced or attached or detached, the Optimal permanent magnet synchronous motor control also becomes difficult

In addition, at this time, if the magnetic pole deviation becomes large, the permanent magnet synchronous motor cannot output the optimal torque, which will cause the elevator to vibrate, or the elevator will stop, etc., making it difficult to operate normally.

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