Patent ID: 11909290
Assignee: ALPS ALPINE CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. An electromagnetic drive device comprising:
a first yoke;
a second yoke arranged to be opposite to the first yoke in a first direction;
a permanent magnet attached to a surface of the first yoke facing the second yoke; and
a first excitation coil and a second excitation coil attached to the second yoke to generate magnetic flux when being energized,
wherein the second yoke includes
a base, and
a first protruding part protruding from the base toward the first yoke, between the first excitation coil and the second excitation coil,

wherein the first excitation coil and the second excitation coil are arranged to have the first protruding part interposed in-between in a second direction perpendicular to the first direction,
wherein an axial core direction of the first excitation coil and the second excitation coil is parallel to the first direction,
wherein the permanent magnet includes
a first region,
a second region positioned on one side of the first region in the second direction, and
a third region positioned on another side of the first region in the second direction,

wherein the first region is magnetized to be a first magnetic pole,
wherein the second region and the third region are magnetized to be second magnetic poles,
wherein the first region is opposite to the first protruding part,
wherein a boundary between the first region and the second region is opposite to the first excitation coil, and
wherein a boundary between the first region and the third region is opposite to the second excitation coil.