US 11,881,746 B2Granted

Rotor and motor having rotor

AssigneeNidec Corporation

InventorsHsin-Nan Lin, Sheng-Chan Yen, Ta-Yin Luo, Guo-Jhih Yan, Yu-Wei Hsu, Cheng-Tsung Liu

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Abstract

An embodiment of the present invention provides a rotor and a motor having the rotor. By providing a plurality of flux barrier groups and slot groups at intervals in a circumferential direction of the rotor iron core, it is possible to flexibly arrange the numbers of the flux barrier groups and the slot groups so as to meet the requirements for the number of poles of different products. In addition, by flexibly adjusting the quantity ratio between the flux barrier groups and the slot groups and/or the quantity relationship between the flux barriers in the flux barrier group and the slots in the slot group, it is possible to meet the requirements for motor efficiency and starting capacity of different products. Further, since the processing jig of the rotor only requires processing of the structures of the flux barriers and the slots, the manufacturing cost can be reduced.

Claims14

Dependent claims

A rotor comprising:

a rotor iron core including electrical steel sheets that are layered in an axial direction, the rotor iron core configured to rotate about a center axis, wherein
the rotor iron core includes
at least two flux barrier groups, and
at least two slot groups penetrating the electrical steel sheets in the axial direction,
each of the at least two flux barrier groups includes at least two flux barriers,
each of the at least two slot groups includes at least two slots,
each flux barrier of the at least two flux barriers has an elongated shape on a cross-section of the rotor iron core, the cross-section being perpendicular to the axial direction, two ends of said each flux barrier being closer to a circumferential surface of the rotor than an intermediate portion of said each flux barrier,
each slot of the at least two slots has an elongated shape, only one end of said each slot being adjacent to the circumferential surface of the rotor, and the other end of said each slot being more distant from the circumferential surface than the one end of said each slot,
the at least two flux barrier groups and the at least two slot groups are provided at intervals in a circumferential direction of the rotor iron core,
said each of the at least two slot groups is a group of two or more slots arranged consecutively along the circumferential direction without being intervened by a flux barrier group of the at least two flux barrier groups,
said each of the at least two flux barrier groups is a group of two or more flux barriers arranged consecutively along the circumferential direction without being intervened by a slot group of the at least two slot groups, one flux barrier of the two or more flux barriers of the flux barrier group being accompanied by at least one other flux barrier that belongs to the flux barrier group, the one flux barrier extending along the at least one other flux barrier from one end to the other end of the at least one other flux barrier, and
a number of the at least two flux barrier groups is larger than a number of the at least two slot groups.

9 more elements

A rotor, comprising:

a rotor iron core including electrical steel sheets that are layered in an axial direction, the rotor iron core configured to rotate about a center axis, wherein the rotor iron core includes
a plurality of flux barrier groups, wherein each of the plurality of flux barrier groups includes a plurality of flux barriers, each flux barrier of the plurality of flux barriers has an elongated shape on a cross-section of the rotor iron core, the cross-section being perpendicular to the axial direction, and two ends of said each flux barrier is closer to a circumferential surface of the rotor than an intermediate portion of said each flux barrier, and
a plurality of slot groups penetrating the electrical steel sheets in the axial direction, wherein each of the plurality of slot groups includes a plurality of slots, each slot of the plurality of slots has an elongated shape, only one end of said each slot is adjacent to the circumferential surface of the rotor, and the other end of said each slot is more distant from the circumferential surface than the one end of said each slot, wherein
the plurality of flux barrier groups and the plurality of slot groups are provided at intervals in a circumferential direction of the rotor iron core,
all flux barriers overlapping each other between the center axis and a point on the circumferential surface of the rotor in a radial direction of the rotor iron core belong to one of the plurality of flux barrier groups,
all slots arranged consecutively along the circumferential direction without being intervened by a flux barrier group of the plurality of flux barrier groups belong to one of the plurality of slot groups, and
a number of the plurality of flux barrier groups is larger than that of the plurality of slot groups.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/270,842Filed 3 Sep 2019
Priority: CN 201811030075.95 Sep 2018
Published: US 2021/0211001 A18 Jul 2021
Granted: 23 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02K 1/246
Rotor cores with salient poles ; Variable reluctance rotors: variable reluctance rotors
H02K 1/02
Details of the magnetic circuit: characterised by the magnetic material
H02K 1/265
Rotor cores with slots for windings: shape, form or location of the slots
H02K 1/28
Rotating parts of the magnetic circuit: means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures