Method of processing rotor
AssigneeSeiko Instruments Inc.
InventorHaruo Kitahara
Life of this patent
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Abstract
A method of processing a rotor of a motor enabling to keep smooth rotation. After the ring-shaped magnet 34 is attached at inner circumference face 31B of an opening portion 31A of a cap-shaped rotor main body through a yoke 33, a rotor shaft portion 31C formed at outside of the main body of the rotor 31 and an attaching hole 31D of a shaft 32 fixed at the main body of the rotor are worked standardizing inner circumference face of the magnet 34. This process can match accurately center line of the magnet 34 and rotation axis of the main body of the rotor so as to keep smooth rotation.
Claims14
A method of processing a rotor of a motor, comprising the steps of:
- forming a shaft portion at an outside surface of a cap-shaped main body of the rotor;
- and
- attaching a ring-shaped magnet at an inside surface of the main body of the rotor;
- wherein the shaft portion and either a shaft formed at the main body of the rotor or a central attaching hole for attaching bearings are formed such that the outer diameter of the shaft portion is the same as the diameter of the inner circumferential surface of the magnet after the magnet is attached at the inside surface of the main body of the rotor.
A method of producing a motor comprising, the steps of:
- providing a stator having a stator coil;
- providing a rotor;
- attaching a ring-shaped magnet to an internal surface of the rotor so as to oppose the stator coil when the motor is assembled;
- and
- forming a cylindrically-shaped shaft at an external surface of the rotor so that the outer diameter of the shaft is the same as the diameter of the inner circumferential surface of the magnet when the magnet is attached at the internal surface of the rotor.
Dependencies are inferred from the claim text.