Rotor blanks, rotors for motors, motors and vehicles

Abstract

The invention discloses a rotor punching piece, a rotor of a motor, a motor and a vehicle. The rotor punching piece is provided with a plurality of slot groups. The slot group includes a permanent magnet installation slot and two first air gap slots. Upward, the two first air gap slots are respectively provided on both sides of the permanent magnet installation slot and communicate with the permanent magnet installation slot. The base line at the midpoint, the first air gap slot has a first side slot wall connected with the outer slot wall of the permanent magnet installation slot, the first side slot wall extends in a direction away from the base line and inclined outward, and the vertical line of the base line is the same as the first side slot wall. The included angle of one side groove wall is α, 0°<α≤75°. According to the embodiment of the present invention, the maximum stress point of the rotor punching sheet is shifted, and the maximum stress value is significantly reduced, so that the stress at the outer groove wall of the permanent magnet installation slot is significantly reduced, the rotor punching sheet is not easily broken, and meets the mechanical requirements. At the same time of strength requirements, silicon steel sheets with better magnetic properties can be selected.

Description

technical field [0001] The present invention relates to the technical field of vehicles, and more particularly, to a rotor punch, a rotor of a motor, a motor and a vehicle. Background technique [0002] In the related art, the rotor is provided with a permanent magnet installation slot for installing the permanent magnet. The structure of the permanent magnet installation slot leads to stress concentration, which makes the rotor punching piece easy to break, for example, the magnetic isolation bridge is easy to break and fail. Therefore, in order to ensure the mechanical strength The width of the magnetic isolation bridge is often designed to be large, resulting in serious magnetic flux leakage, and it is often necessary to select silicon steel sheets with high strength and poor magnetic properties for processing rotor punching pieces. SUMMARY OF THE INVENTION [0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To...

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Problems solved by technology

[0002] In the related art, the rotor is provided with permanent magnet installation grooves for installing permanent magnets. The structure of the permanent magnet installation grooves leads to stress concentration, which leads to easy fracture of the rotor punches, such as the failure of the magnetic isolation bridge. Therefore, in order to ensure the mechanical strength The width of the magnetic isolation bridge is often designed to be large, resulting in serious magnetic flux leakage, and it is often necessary to select a silicon steel sheet with high strength and poor magnetic properties for processing the rotor sheet

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