Patent ID: 11867309
Assignee: DENSO CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC F  H | IPC F  H

Claim 4:
5. A method for magnetizing a throttle valve device, the throttle valve device including:
a body that defines a passage, a motor space, and a connecting portion that connects the motor space to the passage;
a valve that is disposed in the passage and is configured to control a flow rate by adjusting a passage area of the passage;
a motor that is disposed in the motor space and is configured to generate a driving force for the valve to rotate; and
a cover that covers an open end of the body, wherein
the motor includes:
a motor yoke made of a magnetic material;
a magnet that is arranged on an inner circumferential surface of the motor yoke;
a motor shaft that is disposed inside the motor yoke;
a pair of motor bearings that rotatably support the motor shaft;
an armature core that is coupled to the motor shaft in the motor yoke;
a commutator that is coupled to the motor shaft in the motor yoke;
a brush that is configured to energize the commutator; and
a brush holder that holds the brush,

the method comprising:
a magnet arranging step of arranging the motor yoke in the motor space of the body and arranging the magnet in the motor yoke; and
a magnetizing step of magnetizing the magnet disposed in the motor space of the body, wherein
the magnet arranging step further includes:
bringing one ends of a pair of magnets into contact with a holding portion formed in the inner circumferential surface of the motor yoke;
providing a holding spring in a space between the other ends of the pair of magnets; and
biasing the pair of magnets against the holding portion by the holding spring.