Reluctance type wheel hub motor

Abstract

The invention relates to a reluctance type wheel hub motor. The motor comprises a rotor, a stator and a connecting shaft. The stator and the connecting shaft are circumferentially positioned and fixed; the rotor sleeves the outer side of the stator; and the rotor comprises a rim, a shell, a rotor iron core and a permanent magnet. The shell and the rim are of an integrated structure or fixedly connected. The rotor iron core is made of a magnetic conductive material, is arranged on the inner side of the shell and is positioned and fixed; and the rotor core is provided with a plurality of magnetic steel grooves. The magnetic steel grooves are axial through grooves; the permanent magnets are arranged in the magnetic steel grooves in an embedded mode, the number of the magnetic steel grooves isan even number, every two magnetic steel grooves which form an included angle and are distributed in a V-shaped mode form a magnetic steel groove set, the two magnetic steel grooves in the magnetic steel groove set are symmetrical about the symmetry axis of the rotor rotating circle, large openings distributed in the V-shaped mode of the magnetic steel groove set face the circle center, and the magnetic steel groove sets are circumferentially and evenly distributed. The motor has the advantages that the motor is suitable for flux-weakening acceleration driving, the low-speed large-torque characteristic of the motor is guaranteed, high-speed and high-efficiency output can be achieved, the high-efficiency interval is wide, and the endurance mileage is long.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a reluctance type hub motor. Background technique [0002] The electric vehicle motors in the prior art are all hub-type structures. Due to the flat space of the hub-type motors, the diameter of the outer rotor is generally larger. In order to adapt to the large-diameter magnetic ring structure, compared with the traditional inner rotor motor, the hub Motors generally have more magnetic poles arranged in a circle, and considering the use of the motor, the limitations of manufacturing technology and control technology, the magnetic pole surface mount method is used, and the surface mount motor theoretically d-axis and q-axis The inductance ratio is 1, that is, the salient pole ratio of the motor is 1. This type of motor is not suitable for the field-weakening speed-up control scheme, so the speed adjustment space is not large and the high-efficiency range of the motor ...

AI Technical Summary

Problems solved by technology

[0002] The electric vehicle motors in the prior art are all hub-type structures. Due to the flat space of the hub-type motors, the diameter of the outer rotor is generally larger. In order to adapt to the large-diameter magnetic ring structure, compared with the traditional inner rotor motor, the hub Motors generally have more magnetic poles arranged in a circle, and considering the use of the motor, the limitations of manufacturing technology and control technology, the magnetic pole surface mount method is used, and the surface mount motor theoretically d-axis and q-axis The inductance ratio is 1, that is, the salient pole ratio of the motor is 1. This type of motor is not suitable for the field-weakening speed-up control scheme, so the speed adjustment space is not large and the high-efficiency range of the motor is narrow. In addition, the surface-mounted hub motor , the sinusoidal shape of the air gap magnetic density distribution is poor, resulting in low output efficiency of the motor matching square wave controller

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