Electric motor, robot, and brake device
AssigneeSeiko Epson Corporation
InventorKesatoshi TAKEUCHI
Life of this patent
Estimating the term…
Abstract
An electric motor includes a rotor and a stator. Apart of the rotor includes a first frictional portion forming a movement locus. The stator includes a second frictional portion which brakes and stops the rotation of the rotor by a mechanical frictional force produced by contact between the second frictional portion and the first frictional portion, and a braking actuator which does not allow application of braking by shifting the second frictional portion away from the first frictional portion during power supply to the electric motor, and allows application of braking by pressing the second frictional portion against the first frictional portion during cutoff of power supply to the electric motor.
Claims16
An electric motor comprising:
- a rotor;
- and
- a stator,
- wherein
- a part of the rotor includes a first frictional portion forming a movement locus, and
- the stator includes
- a second frictional portion which brakes and stops the rotation of the rotor by a mechanical frictional force produced by contact between the second frictional portion and the first frictional portion, and
- a braking actuator which does not allow application of braking by shifting the second frictional portion away from the first frictional portion during power supply to the electric motor, and allows application of braking by pressing the second frictional portion against the first frictional portion during cutoff of power supply to the electric motor.
An electric motor comprising:
- a rotor;
- a stator;
- a braking unit which brakes the rotation of the rotor;
- a braking actuator which operates the braking unit;
- and
- a braking controller which controls the operation of the braking actuator,
- wherein
- the braking controller has a delay circuit which allows the braking actuator to apply braking after an elapse of a predetermined time from cutoff of power supply to the electric motor,
- during power supply to the electric motor, the braking controller rotates the rotor without allowing the braking actuator to apply braking, and
- during cutoff of power supply to the electric motor, the braking controller draws regenerative current produced by induced voltage generated by the electric motor to allow application of braking by utilizing the regenerative current as regenerative braking, in which case the braking controller allows the braking actuator to apply braking after the elapse of the predetermined time.
An electric motor comprising:
- a rotor;
- a stator;
- a braking unit which brakes the rotation of the rotor;
- a braking actuator which operates the braking unit;
- and
- a braking controller which controls the operation of the braking actuator,
- wherein
- the braking controller has a delay circuit which allows the braking actuator to apply braking after an elapse of a predetermined time from cutoff of power supply to the electric motor,
- during power supply to the electric motor, the braking controller rotates the rotor without allowing the braking actuator to apply braking, and
- during cutoff of power supply to the electric motor, the braking controller rotates the rotor without allowing the braking actuator to apply braking and draws regenerative current produced by induced voltage generated by the electric motor to allow application of braking by utilizing the regenerative current as regenerative braking when detecting a large number of rotations of the electric motor based on the induced voltage corresponding to the large number of rotations of the electric motor, and allows the braking actuator to apply braking when detecting a small number of rotations of the electric motor based on the induced voltage corresponding to the small number of rotations of the electric motor.
Dependencies are inferred from the claim text.