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Cavity structure for permanently excited electric machines with embedded magnets

A permanent magnet, permanent magnet technology, applied in the field of cavity structure for motors with embedded magnets excited with permanent magnets

Pending Publication Date: 2021-07-23
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, according to this prior art, the distribution of the air-gap flux density is influenced by the material and geometry of the permanent magnets

Method used

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  • Cavity structure for permanently excited electric machines with embedded magnets
  • Cavity structure for permanently excited electric machines with embedded magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] figure 1 A sectional view of a sector of an embodiment of an electric machine 1 excited with permanent magnets according to the invention is shown. The electric machine 1 can be designed, for example, as a traction motor of an electrically driveable motor vehicle (not shown here). The electric machine 1 comprises a stator 2 and a rotor 3 mounted rotatably about an axis of rotation A relative to the stator 2 . The stator 2 and the rotor 3 are arranged at a distance from one another, forming an air gap 4 . The stator 2 has a stator lamination pack 5 with a plurality of recesses 6 arranged distributed in the circumferential direction U, in which recesses are arranged an energizable winding 7 of the stator 2 , which can An energized winding is used to generate a rotating magnetic field. The stator 3 can be excited to rotate about the axis of rotation A by means of this rotating magnetic field.

[0028] The rotor 3 has at least two rotor poles P, wherein here, for exampl...

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Abstract

The invention relates to a rotor (3) for a permanently excited electric machine (1) with at least two rotor poles (P), having: - a rotor iron core (8) which has at least one cavity (10) per rotor pole (P), wherein webs (13) are formed between the cavities (10) and the exterior (9) of the rotor iron core (8) in the radial direction (R), and - an embedded permanent magnet assembly for generating a magnetic air gap flux density, said assembly having at least one permanent magnet (11) per rotor pole (P) in the respective cavity (10). The invention is characterized in that in order to influence the curve of the magnetic air gap flux density, magnetic flux blocking sections (14) and magnetic flux conducting sections (15) are arranged in an alternating manner in the at least one web (13) of each rotor pole (P) along the circumferential direction (u), wherein the magnetic flux blocking sections (15) are designed to conduct a magnetic flux within the adjacent magnetic flux conducting section (15) and have different geometries in the circumferential direction (U) starting from a rotor pole center (PM) to rotor pole edges (PR). The invention additionally relates to an electric machine and to a motor vehicle.

Description

technical field [0001] The invention relates to a rotor for an electrical machine excited with permanent magnets, the rotor having at least two rotor poles arranged adjacent to one another in the circumferential direction of the rotor. The rotor comprises a rotor core having for each rotor pole at least one cavity extending axially through the rotor core, wherein in radial direction between the cavity and the outer side of the rotor core Corresponding webs extending in the circumferential direction are formed. The rotor also includes a permanent magnet arrangement embedded in the rotor core for generating an air gap flux density in an air gap of the electric machine radially adjacent to the rotor core outside. For each rotor pole, the permanent magnet arrangement has at least one permanent magnet arranged in a corresponding cavity. The invention also relates to an electric machine excited with permanent magnets and to a motor vehicle. Background technique [0002] This a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27
CPCH02K1/2766H02K15/03
Inventor N·伯查德特K·柯尼格-彼得迈尔
Owner BAYERISCHE MOTOREN WERKE AG