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Debugging and Optimization of Synchronous Permanent Magnet Motor

Ⅰ. Magnetic pole position recognition of synchronous permanent magnet motor

The synchronous permanent magnet motor needs to perform the magnetic pole position recognition function to determine the electrical magnetic pole position of the synchronous motor, which is needed in the field-oriented control. Therefore, for a motor with an uncalibrated encoder, only one-time magnetic pole position identification is required. Compared with the previous asynchronous motor, because the asynchronous motor cannot be connected to the encoder C and D signals, each time the elevator runs on the inverter for the first time, it will automatically perform magnetic pole position recognition, which causes the elevator to produce greater vibration and reduces the comfort of the elevator. 


However, the synchronous permanent magnet motor has C and D signals, so it only needs to perform the magnetic pole position identification once during the elevator commissioning, and then there will be no asynchronous motor, which ensures the comfort of elevator operation.


The main steps of magnetic pole position recognition:


In the actual magnetic pole position recognition process, the motor rotates at least 360°.


The actual magnetic pole position identification method should meet the following supplementary conditions:


1. Rotation speed setting value = 0 or static state


2. The motor can rotate freely and the vertical load can be disconnected


Ⅱ. Brake setting of synchronous permanent magnet motor

The brake of the synchronous permanent magnet motor shall be controlled in sequence and connected via BICO. After the brake is energized (open the brake), the speed/speed setting value remains at zero for this time, and then the speed/speed setting value is enabled.


Motor brake closing time: After powering off the brake (close the brake), the drive is still in closed-loop control at this time, the speed/speed setting value is zero, and the pulse is deleted after this time expires. If the set closing time is shorter than the actual closing time, it may cause the load to slip; and if the closing time is set too large, the control closed loop will impose a reaction on the brake, shortening the service life of the brake.

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