Permanent magnet synchronous motor rotor used for driving new energy automobile

Abstract

The invention discloses a permanent magnet synchronous motor rotor used for driving a new energy automobile. Permanent magnet magnetic steel (3) is placed in linear permanent magnet magnetic steel grooves (4) to compose V-shaped magnetic steel of a pole of a rotor (2); magnetism-isolating magnetic bridges (5) are arranged among the permanent magnet magnetic steel (3); big grooves (1) are closed triangular grooves; small grooves (2) are open triangular grooves; both the big grooves (1) and the small grooves (2) are in the shapes of isosceles triangles and 14-28 big grooves and 14-28 small grooves are provided; the big grooves (1) and the small grooves (2) are arranged at intervals and are uniformly distributed in the periphery of the rotor; the bisector of the top angle of each isosceles triangle shaped small groove (2) is overlapped with the radius of the rotor (2), and pointing direction of each top angle is opposite to the center (O) of the rotor; the bisector of the top angle of each isosceles triangle shaped big groove (1) is overlapped with the radius of the rotor (2), and each top angle points towards the center (O) of the rotor; and the polarity of the permanent magnet magnetic steel (3) is opposite to that of each permanent magnet magnetic steel groove (4).

Description

technical field [0001] The invention relates to motor technology, in particular to a rotor structure of a rare-earth permanent magnet synchronous motor capable of self-starting. Background technique [0002] Vehicle drive motor is the core key component of electric vehicle power system, and its performance directly affects the performance of the vehicle. After more than ten years of development, my country has made great progress in vehicle drive motor technology, products and industries. Great progress. In order to make the motor of electric vehicles more miniaturized and have greater output power, after many years of practice in the world, from the perspective of improving power density and torque density, it is an inevitable choice to use rare earth permanent magnets as the magnetic material of the motor. With the popularization of electric vehicles, the market urgently needs this high-performance motor using rare earth permanent magnet materials. [0003] As the country...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN102111052A, titled "High-efficiency self-starting permanent magnet synchronous motor soft starting method" proposes to realize soft starting by changing the damping winding method, which is completely different from the fixed mode starting of the size slot matching design of this patent; Chinese patent CN201478968U, titled " A sine wave current self-starting three-phase rare earth permanent magnet synchronous motor "Although the salient pole structure with non-uniform air gap is proposed to offset the asymmetry of the magnetic circuit caused by the permanent magnet, it improves the starting performance of the motor and Efficiency, but also does not involve the size and slot matching design to improve the cogging torque of the motor, so as to achieve smooth starting;

[0007] The structure of the motor mentioned above is complex, the leakage reactance of the rotor is large, and the deep groove cage type and the double cage type occupy a large amount of space in the rotor, which is not conducive to the structural optimization and production processing of the motor. The motor faces great technical problems and increases the production cost. There are still deficiencies in motor material saving, performance optimization and working characteristics

[0008] At present, there is a short report in the relevant research in the UK that proposes a matching design of large and small slots to improve the performance of the motor, but there is no in-depth analysis, and there is no relevant research in the domestic literature

Images