Rotor for rotary electric machine

Abstract

The invention provides a rotor for a rotary electric machine to reduce occurrence of a magnetic flux short circuit of a permanent magnet and improve torque of the rotary rotor. A side barrier (60) is provided at a portion adjacent to a circumferential end face (32d) of the permanent magnet (32) and includes a projection barrier portion (62) projecting radially outwardly from an extension line (32bL) extending from an outer peripheral surface (32b) of the permanent magnet (32). A first air gap section (70) is provided at an area which is spaced apart from the projection barrier portion (62) and the magnet insertion hole (40) and faces a peripheral edge (62b) of a circumferentially central side of the projection barrier portion (62) with respect to the projection barrier portion and a circumferential end of the outer peripheral surface (32b) of the permanent magnet (32).

Description

technical field [0001] This invention relates to rotors for rotating electric machines. Background technique [0002] Conventionally, as a rotor used in a rotating electric machine, a structure in which a plurality of permanent magnets are arranged at predetermined intervals along the circumferential direction inside a rotor core is known (for example, refer to Patent Document 1). [0003] like Figure 16 As shown, in the rotor 110 of Patent Document 1, radial flux barriers (flux shields) 113 and 114 are provided on the outer peripheral portion of the rotor core 111 on the circumferential end face side of the permanent magnet 112 . In addition, protrusions 113 a , 114 a are provided on the outer peripheral end portions of the magnetic flux barriers 113 , 114 , and the distance 100L between the magnetic flux barriers 113 , 114 is shorter than the width 100W of the permanent magnet 112 . Also, a core portion 115 is provided between the protrusions 113 a , 114 a of the magneti...

AI Technical Summary

Problems solved by technology

[0010] However, in the rotor 110 of Patent Document 1, the protrusions 113a, 114a are formed integrally with the flux barriers 113, 114, respectively, so that the strength of the rotor core 111 decreases.

Therefore, when the rotor 110 is rotated at a high speed, the centrifugal force cannot be withstood, and the rotor 110 may be damaged.

[0011] Furthermore, when the radial widths of the flux barriers 113 and 114 are reduced in order to withstand the centrifugal force, the outer peripheral portions of the magnetic flux barriers 113 and 114 cannot be located near the outer peripheral surface of the rotor core 111, and the magnetic flux of the permanent magnets 112 short circuit becomes bigger

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