High power wide velocity modulation built-in permanent magnet brushless wheel motor for electric automobile

Abstract

The invention relates to a high-power wide-speed adjustment built-in permanent magnet brush wheel-free motor for an electric automobile, which comprises a shell, and a rotor and a stator arranged in the shell. The rotor comprises a stator core and a stator winding which are fixed on the inner wall of the shell. The stator core comprises a stator yoke, a stator slot and a stator tooth. The rotor comprises a rotating shaft and a rotor core. An inner circle of the rotor core is uniformly embedded with radical magnetizing rectangular magnetic steel strips or cracked radical magnetizing rectangular steel strips along the circumferential direction. The radical magnetizing rectangular magnetic steel strips or the cracked radical magnetizing rectangular steel strips form permanent magnetic poles. An external circle of a pole shoe of a rotor is of a non-concentric arc-shaped curved surface and provided with non-uniformly symmetric radial air gaps. Magnet-shielding magnetic bridges are arranged between the magnetic poles and the high saturation of a magnetic circuit at a cross section of the magnet-shielding magnetic bridges is ensured. The radical insertion depth of the magnetic steel strips in the core, the width of an empty groove of a magnet-embedding steel groove, the angle of the empty groove of the magnet-embedding steel groove, the angle of polar arc and so on are adjusted to realize smooth operation with high efficiency, high power output, wide speed adjustment and quick response.

Description

technical field [0001] The invention relates to a permanent magnet brushless wheel motor, in particular to a built-in permanent magnet brushless wheel motor with high power and wide speed regulation for electric vehicles, belonging to the technical field of motors. Background technique [0002] Exhaust pollution, noise, fire hazards of fuel storage and other issues of automobiles have attracted more and more attention. Electric vehicles have become a new development trend of automobiles, and the drive motor and transmission system are the heart of electric vehicles. Electric vehicle drive motors mainly include AC induction motors and permanent magnet DC brushless motors. The motor rotates at a high speed and cannot be directly driven. It must be decelerated by the transmission chain to drive the wheels. When the energy (battery) supply of electric vehicles is very precious, part of the energy has to be consumed in the low-efficiency transmission chain, which increases the vo...

AI Technical Summary

Problems solved by technology

The permanent magnet DC brushless motor (BLM) has many advantages, but the armature excitation is a "non-circular jumping" rotating magnetic field, and there is a large torque fluctuation. At the same time, the current permanent magnet brushless wheel motor for electric vehicles has Defects such as poor mechanical characteristics, low efficiency, small starting torque, low overload capacity, poor linearity, and narrow speed range affect the smooth and low-noise operation of the motor

High-power permanent magnet brushless wheel motors (10KW-50KW) for electric vehicles have higher comprehensive performance requirements and are more difficult to achieve industrialization

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