Motor rotor, motor and electric vehicle

Abstract

The invention relates to a motor rotor, a motor and an electric vehicle. The motor rotor comprises a rotor core with rotor punching sheets and magnetic steel groove sets which are arranged on the rotor punching sheets at intervals in the circumferential direction, wherein a first magnetic steel groove and a third magnetic steel groove in each magnetic pole groove set are arranged into structures which are respectively symmetrical about the radial center line along the circumferential direction; the pair of second magnetic steel grooves are symmetrically arranged on the two sides of the first magnetic steel groove and the third magnetic steel groove at intervals relative to the radial center line; the pair of second magnetic steel grooves incline inwards in the radial direction in the direction close to each other; the third magnetic steel groove is located on the inner side of the first permanent magnet at an interval in the radial center line direction; the inner end of the second magnetic steel groove and the third magnetic steel grooves are oppositely arranged at an interval in the circumferential direction; and in the radial center line direction, the first outermost end of thethird magnetic steel groove is flush with the second outermost end of the second magnetic steel groove or located on the outer side of the second outermost end. Therefore, the total torque of the motor can be improved and the strength of the rotor punching sheet is improved.

Description

technical field [0001] The present disclosure relates to the technical field of motors, and in particular, to a motor rotor, a motor and an electric vehicle. Background technique [0002] Motors are widely used as driving devices in various technical fields. For example, they can be used as the driving motor of electric vehicles to realize the function of driving vehicles. Due to the limitations of the design, it is usually necessary to design a small-volume drive motor, and the small-volume drive motor uses too little magnetic steel due to the limited layout space, which reduces the air gap flux density and electromagnetic torque. In this regard, in order to meet the torque requirements of the motor, the torque of the motor can be increased by appropriately increasing the number of permanent magnets. However, most of the following problems exist in this way, that is, the rotor of the motor is partially The structure, especially at the position where the rotor punch corresp...

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Problems solved by technology

[0002] Motors are widely used as driving devices in various technical fields. For example, they can be used as the driving motor of electric vehicles to realize the function of driving vehicles. However, due to the limitation of layout space, it is usually necessary to design a small-volume drive motor, and the small-volume drive motor uses too little magnetic steel due to the limited layout space, which reduces the air gap flux density and electromagnetic torque.

In this regard, in order to meet the torque requirements of the motor, the torque of the motor can be increased by appropriately increasing the number of permanent magnets. However, most of the following problems exist in this way, that is, the rotor of the motor is partially structure, especially at the position where the rotor punch corresponds to the permanent magnet, excessive local stress concentration occurs, which in turn affects the overall service life of the motor

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