Self-adaptive estimating method for position of rotor of non-inductive permanent magnet synchronous motor

Abstract

The invention relates to a self-adaptive estimating method for the position of a rotor of a non-inductive permanent magnet synchronous motor. The method includes the following steps of firstly, designing a continuous self-adaptive sliding-mode observer for observing the counter electromotive force of the motor, and selecting the gain of the self-adaptive sliding-mode observer; secondly, using theobservation value of the continuous self-adaptive sliding-mode observer for extracting a quasi-flux-linkage signal containing the rotor position and speed direction; thirdly, designing a lock phase ring of speed information on the basis of a tangent function, and obtaining the rotor position information from the quasi-flux-linkage model signal. Compared with the prior art, the method has the advantages that the structure is clear, parameter selection is simple and convenient, and the position information estimation accuracy in the forward rotation and backward rotation of the motor can be kept.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a rotor position self-adaptive estimation method of a non-inductive permanent magnet synchronous motor. Background technique [0002] At present, permanent magnet synchronous motors are widely used as high-precision servo motors in many industrial production and precision manufacturing fields. To achieve precise control of the permanent magnet synchronous motor, it is necessary to obtain the position and speed information of the motor rotor; such information is usually obtained by the rotor position sensor installed at the tail of the motor. Installing such sensors will increase the overall size of the motor, increase the purchase cost of the motor, and increase the probability of mechanical failure. These problems limit the use and promotion of permanent magnet synchronous motors to a certain extent. One of the ways to solve this problem is to develop a sensorless observa...

AI Technical Summary

Problems solved by technology

First of all, the gain required by the discontinuous sliding mode observer in the design process is mainly adjusted through experience, and the observer needs to be used with a low-pass filter, resulting in a phase delay in the system

Secondly, when the motor speed direction is reversed, the deviation between the estimated result of the sinusoidal phase-locked loop and the real position signal will theoretically reach 180°. Therefore, it is necessary to redesign the parameter values ​​of the PID controller in the phase-locked loop. Use Inconvenient; in addition, the phase-locked loop needs to be normalized during use, and the amount of calculation is large

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