Quadrature-direct axis inductance variable permanent magnet brushless motor and wide-area efficient optimization design method thereof

Abstract

The invention discloses a quadrature-direct axis inductance variable permanent magnet brushless motor and a wide-area efficient optimization design method thereof. The method comprises the following steps of 1, obtaining a quadrature-direct axis inductance ratio through a magnetic circuit diagram of a multi-working-condition permanent magnet motor; 2, when an automobile is in different working conditions, enabling the motor to respectively meet the requirements for torque, speed regulation range, wide area and high efficiency under the corresponding working conditions through the change of thequadrature-direct axis inductance ratio; 3, setting the quadrature-direct axis inductance variable permanent magnet brushless motor; 4, preliminarily optimizing the sizes of a rotor magnetic barrierand an arc-shaped permanent magnet, and giving out an initial size and a constraint condition; and 5, comprehensively optimizing the sizes of the initial rotor magnetic barrier and the arc-shaped permanent magnet in the step 4 according to the requirements of different working conditions. According to the invention, the multi-target requirements under different working conditions that the motor obtains the higher comprehensive efficiency than a traditional permanent magnet brushless motor under the condition of simple structure and has higher torque density under a light-load condition, etc.,are satisfied.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet brushless motors, and relates to a permanent magnet brushless motor with variable AC and direct axis inductance and a wide-area high-efficiency optimization design method thereof. Background technique [0002] In recent years, electric vehicles have become one of the main directions for the development of new energy vehicles due to their remarkable advantages such as high efficiency and zero emissions. Similar to traditional vehicles, electric vehicles also need to meet a variety of driving environments such as "urban roads, highways, and rural roads". an operating condition. This complex driving environment and changing operating conditions place more stringent performance requirements on the motor and its drive system. [0003] At present, permanent magnet brushless motors have been widely used in electric drive systems of electric vehicles due to their advantages of high power densit...

AI Technical Summary

Problems solved by technology

[0003] At present, permanent magnet brushless motors have been widely used in electric vehicle electric drive systems due to their advantages of high power density, high efficiency, and high control accuracy. However, due to the inherent characteristics of permanent magnet motors, the air gap of permanent magnet motors The magnetic field remains basically constant, and there are deficiencies such as "narrow speed regulation range" and "low efficiency in high-speed magnetic field weakening", which to a certain extent restricts the large-scale application of permanent magnet motors in the field of electric vehicle drive motors, and at the same time also becomes a delay in the rapid development of electric vehicles. One of the many disadvantages of development

Chinese Patent No. 201510026381.5 proposes a hybrid excitation motor, which can realize the flexible adjustment and control of the air gap magnetic field of the motor by adjusting the magnitude and direction of the electric excitation winding current. In the constant power region, the continuous electric excitation copper loss has a great influence on the efficiency of the motor

However, in this type of motor, due to the low utilization rate of the reluctance torque, its load capacity in the high-speed area is still limited.

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