Rotor structure of asynchronous starting permanent magnet synchronous motor and application

Abstract

The invention discloses a rotor structure of an asynchronous starting permanent magnet synchronous motor and application. The whole conducting bars are in non-uniform and asymmetric distribution, the conducting bars and the permanent magnets jointly form a multi-layer rotor structure with a magnetic flux barrier effect, the main magnetic flux of the motor inclines towards the conducting bars, the d-axis magnetic resistance is obviously increased, the d-axis magnetization inductance is reduced, the salient pole ratio of the motor is increased, the magnetic resistance torque is increased, the acceleration torque in the pull-in synchronization process is increased, and the pull-in synchronization capability is improved. Compared with the prior art, under the condition that the number of the conducting bars is the same, the sectional area of the conducting bars in the counter-electromotive force direction is large, the overall resistance of the conducting bars is reduced, the slip rate is decreased when the rotating speed is close to critical synchronous speed, and the pull-in synchronous capacity is improved. Besides, the guide bars in the main magnetic flux direction of the motor have a certain inclination angle in space, so that the d-axis current and the q-axis current are greatly changed, the d-axis inductance is reduced, the d-axis current is increased, and the q-axis current is reduced, so that the synthetic current is reduced, the internal power factor angle is increased, the power factor angle is reduced, and the power factor and the efficiency are improved.

Description

technical field [0001] The present application relates to the technical field of motors, and in particular, to the rotor structure and application of an asynchronous start permanent magnet synchronous motor. Background technique [0002] Asynchronous starting permanent magnet synchronous motor has the advantages of high efficiency, high power factor and strong overload capacity under the condition of self-starting ability. It is a new type of permanent magnet motor with good development prospects. If the asynchronous start permanent magnet synchronous motor is used to replace or partially replace the industrial asynchronous motor, a good energy saving effect can be achieved. However, in practical applications, the traditional asynchronous starting permanent magnet synchronous motor should not only have excellent steady-state performance indicators, but also meet the requirements of reliable operation in terms of transient performance, especially in some special applications ...

AI Technical Summary

Problems solved by technology

The start of the asynchronously started permanent magnet synchronous motor is divided into an asynchronous start stage and a pull-in synchronous stage, and the pull-in synchronization process often requires more energy to accelerate to the synchronous speed due to the larger system inertia, which affects the pull-in performance. There are very strict requirements, especially in special occasions, once the motor is pulled into the synchronous ability is poor or cannot be pulled into the synchronous operation, which has a great impact on the steady-state operation of the motor

At the same time, a large starting current for a long time will increase the impact of the motor on the power supply, which is also detrimental to the anti-demagnetization ability of the permanent magnet

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