Whole-speed range control method of position sensor of elevator door motor

Abstract

The invention discloses a whole-speed range control method of a position sensor of an elevator door motor. The method comprises the steps of injecting high-frequency pulse-vibrating current signals in an estimation coordinate system through a current closed-loop control in a scope of zero speed and under-speed, extracting information relevant to position errors to track the position and low-speed rotating speed of a rotor of the elevator door motor, and then using a variable gain S curve function and a novel sliding-mode observer to realize no sensor control in the high-speed scope. By adopting a weighting algorithm to complete smooth switching between low and high speed scopes. According to the no-sensor control in the whole speed scope of the door motor can be realized finally, and the mounting difficulty of the process installation of the door-motor system can be reduced; furthermore, the method has the advantages of wide scope of application, strong capacity of resisting disturbance, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a position sensorless control method in the full speed range of an elevator door machine. Background technique [0002] Nowadays, high-performance elevator door machine systems generally use permanent magnet synchronous motors with simple structure, small size, and high efficiency as door machine motors. The control strategies mainly use vector control and direct torque control; and they all require position sensors to provide accurate speed And rotor position feedback signal to achieve high-performance motor control, the mechanical sensor will inevitably bring many disadvantages, such as complex sensor installation process, poor anti-interference ability, high cost; significance. [0003] At present, there is no perfect control method that can realize position sensorless operation in the full speed range. The sensorless control methods for permanent magnet synchronous motors wit...

AI Technical Summary

Problems solved by technology

Among them, the direct calculation method belongs to the open-loop estimation, and the continuous change of the motor parameters during the operation will affect the detection accuracy.

The observer method also includes the sliding mode observer and the extended Kalman filter observer, etc. The algorithm of the extended Kalman filter observer is complex and the amount of calculation is large

The traditional sliding mode observer has strong robustness to parameter changes, but it will inevitably bring problems such as system chattering and time delay

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