Switched reluctance motor flux linkage characteristic measurement method

Abstract

The invention discloses a switched reluctance motor flux linkage characteristic measurement method, which includes the following steps: a position sensor is calibrated, and the coefficient of a measuring circuit is determined; a load is removed, a switched reluctance motor is operated, and the switching angle is adjusted, so that the phase current of the motor is similar to the shape of a flat-topped wave; the direct-current voltage is decreased, so that the peak value of the phase current is as small as possible, and a data matrix is sampled and stored; the direct-current voltage is increased, so that the peak value of the phase current is slowly increased; the load is added, the turn-on angle or the turn-off angle is changed, a needed data set is detected, and the data are sampled and stored; and the peak value of the current is gradually increased until reaching the upper limit of the current allowed by the motor, and data vectors are recorded under different currents until the maximum phase current reaches a maximum current imax needing a current peak value. The whole process of the method only uses the conventional switched reluctance motor speed regulation system and the conventional storage type digital oscilloscope, and does not need a specialized mechanical rotor positioning and clamping device, and the measuring equipment can be easily obtained.

Description

Technical field: [0001] The invention relates to a method for measuring the flux linkage characteristic of a switched reluctance motor. Background technique: [0002] Flux linkage characteristics are the basis of research on modeling, simulation and model-based control of switched reluctance motors. The function of the flux linkage of each phase with respect to the phase current and position angle can be expressed as ψ(i, θ). Due to the double salient pole structure and the saturation nature of the magnetic circuit of the switched reluctance motor, the flux linkage presents a highly nonlinear characteristic, which is accurate It is also difficult to describe the ψ(i, θ) function. [0003] The literature proposes a variety of methods to obtain the flux linkage characteristics of switched reluctance motors. These methods can be divided into finite element method (FEA), direct measurement method and indirect measurement method. [0004] (1) Finite element method: Flux linkag...

AI Technical Summary

Problems solved by technology

However, specialized software is expensive, and users of switched reluctance motor design data are often not available

On the other hand, the calculation process of finite element is very time-consuming, and the accuracy of the calculation results depends to a large extent on the specific division of the finite element grid

[0005] (2) Direct measurement method: The direct measurement method is to measure the magnetic flux density with the help of a magnetic sensor installed inside the motor to obtain the flux linkage. Because this method is inconvenient and expensive, it is rarely used in practice.

Most of the indirect detection methods require special rotor mechanical positioning and clamping devices, and when the electromagnetic torque is large during the measurement process, the rotor will rotate to a certain extent, which affects the measurement results

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