Asynchronous motor control method based on slip frequency limitation

Abstract

The invention provides an asynchronous motor control method based on slip frequency limitation. The asynchronous motor control method comprises the following steps: calculating a slip frequency in closed loop vector control, and if the calculated slip frequency exceeds twice of a rated slip frequency, carrying out amplitude limiting processing on the slip frequency; calculating the slip frequency in open-loop vector control, and if the calculated slip frequency exceeds twice of the rated slip frequency, carrying out amplitude limiting processing on the slip frequency; simultaneously, obtaining an estimated speed value by adopting a speed estimation algorithm, if the estimated speed value is out of the ranges of two fluctuated rated slips of a set speed value, carrying out amplitude limiting processing on the estimated speed value. According to the asynchronous motor control method, the slip range is determined through the relationship between the torque and the slip; the slip frequency calculated by motor parameters is subjected to amplitude limiting processing, and thus an excessive deviation between the estimated speed value and an actual speed value, and an excessive deviation of a vector decomposition angle are avoided at any time; the anti-jamming capability is effectively improved; the reliability of a product is improved.

Description

technical field [0001] The invention belongs to the field of vector control of asynchronous motors, in particular to an asynchronous motor control method based on slip frequency limitation. Background technique [0002] Inverter asynchronous motor vector control is divided into closed-loop vector control and open-loop vector control according to whether there is an encoder. The closed-loop vector directly obtains the current rotation speed of the motor rotor by detecting the encoder signal, and the open-loop vector obtains the current rotation speed of the motor rotor indirectly through the mathematical model estimation of the motor. [0003] Closed-loop vector control block diagram such as figure 1 as shown, figure 1 Middle: ω * Indicates the frequency given, ω indicates the motor output frequency measured by the encoder, IT_REF indicates the output of the speed loop, that is, the torque current given value, IT_FED indicates the torque current feedback value, IM_REF indi...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide an asynchronous motor control method based on slip frequency limitation to effectively improve the anti-interference ability

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