An AC-D axis inductance variable permanent magnet brushless motor and its wide-area high-efficiency optimal design method

Abstract

The invention discloses an AC-D axis inductance variable permanent magnet brushless motor and a wide-area high-efficiency optimization design method thereof. 2. When the car is in different working conditions, the motor can meet the requirements of torque, speed regulation range and wide-area efficiency under the corresponding working conditions through the change of the ratio of the AC-D axis inductance; step 3, set the AC-D axis inductance to be variable Type permanent magnet brushless motor; step 4, conduct preliminary optimization on the size of the rotor magnetic barrier and arc permanent magnet, and give the initial size and constraint conditions; step 5, according to the requirements of different working conditions The dimensions of the magnetic barrier and the arc-shaped permanent magnet are comprehensively optimized. The invention enables the motor to obtain higher comprehensive efficiency than the traditional permanent magnet brushless motor under the condition of simple structure, and guarantees the multi-objective requirements under different working conditions such as higher torque density under the condition of light load.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet brushless motors, and relates to an alternating-direction axis inductance variable permanent magnet brushless motor 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 significant advantages such as high efficiency and zero emissions. Similar to traditional cars, electric vehicles also need to meet various driving environments such as "urban roads, expressways, and rural roads". operating conditions. This complex driving environment and variable operating conditions put forward more stringent performance requirements for the motor and its drive system. [0003] At present, permanent magnet brushless motors have been widely used in electric vehicle electric drive systems 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.

Images