Patent ID: 11919664
Assignee: JAPAN AEROSPACE EXPLORATION AGENCY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  G  H  Y | IPC B  G  H

Claim 5:
6. The reaction wheel apparatus according to claim 1, wherein the reaction wheel includes
a rotary body disposed so as to face the one frame,
an electromagnet disposed between the one frame and the rotary body, and
a spring attached to the one frame and urging the electromagnet toward the one frame,
wherein at least a partial portion of the rotary body facing the electromagnet is formed of a ferromagnetic material,
the electromagnet is urged by the spring in such a manner that the electromagnet and the rotary body are separated from each other when the electromagnet is not energized, and
the electromagnet comes into contact with the rotary body against an urging force of the spring when the electromagnet is energized, thereby braking the rotary body.