Rotor for rotating machine, manufacturing method of rotor and motor for electrically driven power steering
AssigneeHitachi, Ltd.
InventorsKouji Harada, Mitsuaki Mirumachi
Life of this patent
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Abstract
An object of the present invention is to provide a rotor with a high accuracy, a manufacturing method of the rotor and the motor for an electrically driven power steering in a manner that the accuracy of a shaft itself is not degraded, then a core is not applied with excessive deformation, and the shaft and the core are joined while maintaining the accuracy of each of these parts. A rotor is configured by a rotor core which is formed by laminating a plurality of silicon steel plates and has a through hole at the center thereof, and a shaft which is pressed into the through hole of the rotor core. The rotor core is locally annealed only at a portion near the surface of the through hole.
Claims10
A rotor comprising:
- a rotor core which is formed by laminating a plurality of metal plates and has a through hole at a center thereof;
- and
- a shaft which is pressed into the through hole of the rotor core, wherein
- the rotor core is locally annealed only at an area near a surface of the through hole.
A rotor comprising:
- a rotor core which is formed by laminating a plurality of metal plates and has a through hole at a center thereof;
- and
- a shaft which is pressed into the through hole of the rotor core, wherein
- a plurality of coupling coinings are formed in a longitudinal direction at an outer periphery of the shaft, and
- the rotor core is locally annealed at an area which is near a surface of the through hole and at which the coinings bite into the rotor core when the shaft is pressed into the through hole of the rotor core.
A method of manufacturing a rotor in a manner that a shaft is pressed into a rotor core which is formed by laminating a plurality of metal plates and has the through hole at a center thereof, comprising the steps of:
- punching each of the plurality of metal plates by a pressing process to form a plurality of metal plates each having a predetermined shape;
- laminating the plurality of the metal plates of the predetermined shape to form the rotor core;
- locally heating only at an area near a surface of the through hole passing through the center of the rotor core to a recrystallization temperature of the rotor core or more to anneal the area;
- and
- pressing the shaft into the through hole of the rotor core.
A motor for an electrically driven power steering, comprising:
- a stator;
- and
- a rotor which is disposed so as to oppose to the stator through a gap and is supported rotatably, wherein
- the rotor including:
- a rotor core which is formed by laminating a plurality of metal plates and has a through hole at a center thereof;
- and
- a shaft which is pressed into the through hole of the rotor core, wherein
- the rotor core is locally annealed only at an area near a surface of the through hole.
Dependencies are inferred from the claim text.