Squirrel-cage induction motor, and method for manufacturing squirrel-cage induction motor
AssigneeMitsubishi Electric Corporation
InventorsHideo TERASAWA, Kenichi NAKAGAWA
Life of this patent
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Abstract
Core slots are provided in an outer circumferential side of a rotor core and extend in an axial direction of a rotor shaft. A rotor conductor is a rod-shaped conductor inserted in each of the slots, and after insertion of the rotor conductor in each slot, a flared portion is formed flaring in a slot-transverse direction, and a propping-apart force occurring between the flared portion and both side wall surfaces of the slot fixes the rotor conductor to the slot. In an inner wall of an outer circumferential side of each slot abutting the flared portion, an unevenness is arranged along the axial direction of the rotor shaft.
Claims20
A squirrel-cage induction motor comprising:
- a rotor core comprising slots extending in an axial direction of the rotor core in an outer circumferential side of the rotor core;
- and
- a rotor conductor having a rod shape and inserted in each slot of the slots, wherein
- after insertion of the rotor conductor in the slot, a flared portion is formed in an outer circumferential side of the rotor conductor by flaring of the conductor in a transverse direction of the slot, and the rotor conductor is fixed to the slot by a propping-apart force occurring between the flared portion and both side walls of the slot, and
- for each of the slots, in an inner wall of an outer circumferential side of the slot abutting the flared portion, at least one unevenness is disposed along the axial direction of the rotor core, the unevenness comprising at least one of recess or a projection.
A method for manufacturing a squirrel-cage induction motor, comprising:
- forming, in slots extending in an axial direction of a rotor core in an outer circumferential side of the rotor core, at least one unevenness along the axial direction of the rotor core;
- inserting a rotor conductor having a rod shape in each of the slots;
- and
- forming in the inserted rotor conductor a flared portion flaring in a transverse direction of the slot at a portion of the rotor conductor abutting the unevenness.
Dependencies are inferred from the claim text.