Permanent magnet synchronous motor control system

Abstract

The present invention relates to a permanent magnet synchronous motor control system, which is used to realize the intelligent control of the elevator door machine. An incremental photoelectric encoder is provided, and the incremental photoelectric encoder is used to collect the speed and rotor position information of the permanent magnet synchronous motor; the gate machine driver is used to supply power to the permanent magnet synchronous motor, and obtain Speed ​​and rotor position information, drive and control the permanent magnet synchronous motor; power conversion circuit, used to convert the output voltage of the door machine driver, supply power to the incremental photoelectric encoder in the permanent magnet synchronous motor, and convert the incremental photoelectric encoder The pulse signal generated by the encoder is converted into an incremental encoder input signal and transmitted to the door machine driver. Compared with the prior art, the present invention has the advantages of simple structure, good speed regulation performance, convenient installation, high integration and strong practicability.

Description

technical field [0001] The invention relates to a motor control system, in particular to a permanent magnet synchronous motor control system. Background technique [0002] Statistics show that 70% of elevator failures occur on the door. It can be seen that the door machine control system is very important to the entire elevator system; the elevator door machine is the actuator for opening and closing the elevator door. To the pros and cons of the overall performance of the elevator. [0003] Elevator door machine and its control system are mainly divided into two categories: one is composed of DC motor and its speed regulation system, and the other is composed of AC motor and its speed regulation system. DC motors have excellent performance, but their structures are complicated, their manufacturing costs are high, and their maintenance workload is heavy, especially when commutation sparks are generated during operation. The asynchronous motor controller in the AC motor has...

AI Technical Summary

Problems solved by technology

DC motors have excellent performance, but their structures are complicated, their manufacturing costs are high, and their maintenance workload is heavy, especially when commutation sparks are generated during operation.

The torque-to-volume ratio of the asynchronous motor controller in the AC motor is low, and it cannot directly drive the door machine to work. It needs to install a larger transmission device, and the speed regulation accuracy is not high.

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