Rotator

A rotator comprising:

• a motor including:
• a stator having a cylindrical shape;
• a rotor provided on an inner peripheral side of the stator such that there is a gap between the rotor and the stator;
• and
• a shaft provided in such a way as to penetrate the rotor;
• and
• a brake adapted to brake the motor, wherein
• the brake includes:
• a rotating plate adapted to rotate with rotation of the shaft, the rotating plate being fixed on an outer peripheral surface of the shaft;
• a slide plate provided such that the slide plate can be slid in an axial direction of an axis of rotation of the motor in such a way as to approach and move away from the rotating plate;
• a spring adapted to bias the slide plate toward the rotating plate by spring force;
• and
• an electromagnet disposed such that the electromagnet and the slide plate are located on opposite sides of the spring in the axial direction, the electromagnet being capable of attracting the slide plate in a direction away from the rotating plate against the spring force of the spring,
• the electromagnet includes:
• a yoke including an inner cylinder and an outer cylinder, the inner cylinder having a cylindrical shape, the shaft being passed through the inner cylinder, the outer cylinder having a cylindrical shape, the outer cylinder being disposed on an outer peripheral side of the inner cylinder such that there is a space between the inner cylinder and the outer cylinder;
• and
• a brake coil disposed in the space formed between the inner cylinder and the outer cylinder, wherein
• the yoke is disposed between the slide plate and the rotor in the axial direction such that there is a gap between the yoke and each of the slide plate and the rotor,
• the brake coil is disposed adjacent to the rotor in the axial direction,
• the yoke includes a thin cylinder that connects the inner cylinder and the outer cylinder, the thin cylinder being smaller in thickness than the inner cylinder and the outer cylinder, and
• when the brake coil is energized, the slide plate is adapted to approach both the inner cylinder and the outer cylinder.

A rotator comprising:

• a motor including:
• a stator having a cylindrical shape;
• a rotor provided on an inner peripheral side of the stator such that there is a gap between the rotor and the stator;
• and
• a shaft provided in such a way as to penetrate the rotor;
• and
• a brake adapted to brake the motor, wherein
• the brake includes:
• a rotating plate adapted to rotate with rotation of the shaft, the rotating plate being fixed on an outer peripheral surface of the shaft;
• a slide plate provided such that the slide plate can be slid in an axial direction of an axis of rotation of the motor in such a way as to approach and move away from the rotating plate;
• a spring adapted to bias the slide plate toward the rotating plate by spring force;
• and
• an electromagnet disposed such that the electromagnet and the slide plate are located on opposite sides of the spring in the axial direction, the electromagnet being capable of attracting the slide plate in a direction away from the rotating plate against the spring force of the spring,
• the electromagnet includes:
• a yoke including an inner cylinder and an outer cylinder, the inner cylinder having a cylindrical shape, the shaft being passed through the inner cylinder, the outer cylinder having a cylindrical shape, the outer cylinder being disposed on an outer peripheral side of the inner cylinder such that there is a space between the inner cylinder and the outer cylinder;
• and
• a brake coil disposed in the space formed between the inner cylinder and the outer cylinder, wherein
• the yoke is disposed between the slide plate and the rotor in the axial direction such that there is a gap between the yoke and each of the slide plate and the rotor,
• the brake coil is disposed adjacent to the rotor in the axial direction,
• the brake coil and the rotor are equal in outer diameter,
• the outer cylinder and the stator are equal in outer diameter, and
• when the brake coil is energized, the slide plate is adapted to approach both the inner cylinder and the outer cylinder.