Rotor assembly, motor, electric power steering device and vehicle

Abstract

The invention discloses a rotor assembly, a motor, an electric power steering device and a vehicle. The rotor assembly comprises a rotor iron core and a plurality of permanent magnets, wherein the rotor iron core is provided with a plurality of magnet grooves, the outer peripheral surface of the rotor iron core is provided with through holes, the through holes are communicated with the magnet grooves, the rotor iron core is formed by stacking a plurality of rotor punching sheets, the rotor punching sheets are provided with sub-grooves which are oppositely arranged in the axial direction of the rotor iron core to form magnet grooves, arc-shaped areas are formed between the parts, matched with the permanent magnets, of the sub-grooves and the outer peripheries of the rotor punching sheets, magnetic ribs are formed between the adjacent sub-grooves, in the first rotor punching sheet,the two sides of the arc-shaped area are provided with first magnetic isolation bridges, and the arc-shaped area is connected with the magnetic ribs through the first magnetic isolation bridges, and in the second rotor punching sheet, sub-holes are formed in at least one sides, in the circumferential direction of the rotor punching sheets, of at least part of the magnetic ribs so as to be separated from the arc-shaped area, and the multiple sub-holes form the through holes. According to the invention, the rotor assembly is low in magnetic flux leakage, convenient to assemble and high in structural strength.

Description

technical field [0001] The present invention relates to the technical field of motors, in particular to a rotor assembly, a motor with the rotor assembly, an electric power steering device with the motor and a vehicle with the motor. Background technique [0002] Permanent magnet motors are widely used due to the advantages of simple structure, low loss and high efficiency. At present, the electric power steering motor mainly adopts a built-in rotor structure. However, the built-in rotor structure is prone to magnetic flux leakage at the magnetic isolation bridge, resulting in reduced utilization of permanent magnets and high cost. Contents of the invention [0003] The present invention is based on the inventor's discovery and recognition of the following facts and problems: In the related art, the rotor core includes alternately arranged first rotor laminations and second rotor laminations, and the magnetic poles of the first rotor laminations are Reinforcing ribs and ...

AI Technical Summary

Problems solved by technology

However, the built-in rotor structure is prone to magnetic flux leakage at the magnetic isolation bridge, resulting in reduced utilization of permanent magnets and high cost

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