Optimization design method for high-efficiency synchronous motor of new energy automobile

Abstract

The invention relates to an optimization design method for a high-efficiency synchronous motor of a new energy automobile. The method includes the steps that an iron loss computation model is established for the permanent magnet synchronous motor, and magnetic density changes are researched, so that magnetic hysteresis losses and no-load iron losses corresponding to different sub-harmonic magnetic fields are obtained; theoretical analysis and finite element solving are performed on load stray losses of the permanent magnet synchronous motor of the automobile in the aspects of a stator, a rotor and a permanent magnet, and permanent magnet eddy-current losses are restrained; a water cooling system of the motor is analyzed, influences on the high-efficiency range and weak magnetic performance by parameter matching are analyzed, the rotor structure form, polar trough matching and no-load counter electromotive force of the motor sample are designed, and the motor sample is tested. Through analyzing the magnetic field features, the magnetic hysteresis losses and eddy-current losses, the degree and distribution of rotor losses and the permanent magnetic eddy-current losses are accurately computed under matching between different rotor structures and polar troughs, and therefore effective measures for restraining the rotor losses and permanent magnetic eddy-current losses are found.

Description

technical field [0001] The invention belongs to the technical field of automobile motors, and in particular relates to an optimal design method of a high-efficiency synchronous motor for a new energy automobile. Background technique [0002] As global warming and energy problems become more and more serious, the development of new energy vehicles has been highly valued by governments, automobile manufacturers and scientific research institutes, and they have formulated plans for the development of electric vehicles, setting off a global upsurge in the development of electric vehicles. Due to its simple structure, high efficiency, good speed regulation performance and other advantages, permanent magnet synchronous motor has been widely concerned by the industry. In recent years, the development of permanent magnet materials and motor design technology has also provided a good foundation for its application. As of 2010, more than 90% of hybrid vehicles sold in the United Stat...

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Problems solved by technology

As the speed increases, the alternating frequency of various harmonic magnetic fields in the rotor also gradually increases, which causes the loss of the rotor and permanent magnets to increase and cause serious heat generation, which affects the reliability of the motor operation.

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