Electric motor with internal brake assembly
AssigneeEaton Intelligent Power Limited
InventorDaniel Henry Roberts
Life of this patent
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Abstract
An electric motor-brake assembly includes a housing within which a rotor assembly, a stator assembly, and a brake assembly are disposed. The brake assembly is operable between an engaged state and a disengaged state. The rotor assembly is axially movable within the housing and is supported by bearings supporting both radial and axial loads. When the motor stator is de-energized, the brake assembly is in the engaged state to prevent the rotor assembly from rotating in at least one rotational direction. When the motor stator is energized, the brake assembly is in the disengaged state such that the rotor assembly is free to rotate. The brake assembly can include a friction pack that is engaged and disengaged by axial displacement of the rotor assembly.
Claims20
An electric motor-brake assembly comprising:
- a) a housing;
- b) a rotor assembly disposed at least partially within the housing;
- c) a stator assembly disposed at least partially within the housing;
- and
- d) a brake assembly disposed within the housing, the brake assembly being operable between an engaged state and a disengaged state;
- e) wherein, when coils of the stator assembly are de-energized, the brake assembly is in the engaged state to prevent the rotor assembly from rotating in at least one rotational direction;
- f) wherein, when the coils of the stator assembly are energized, the brake assembly is in the disengaged state such that the rotor assembly is free to rotate.
An electric motor-brake assembly comprising:
- a) a motor housing;
- b) a rotor assembly disposed within the motor housing and being axially displaceable between a first position and a second position;
- c) a stator assembly disposed within the motor housing;
- d) a bearing assembly rotatably supporting the rotor assembly;
- e) a friction pack disposed within the motor housing;
- and
- f) a spring pack biasing the rotor assembly in a direction towards the friction pack;
- g) wherein, when the stator is de-energized, a spring force provided by the spring pack holds the rotor assembly in the first position and in engagement with the friction pack to prevent the rotor assembly from rotating in at least one rotational direction;
- h) wherein, when the stator is energized, the rotor assembly is moved relative to the stator assembly into the second position against the spring force of the spring pack and out of engagement with the friction pack such that the rotor assembly is free to rotate.
An electric motor-brake assembly comprising:
- a) a motor housing;
- b) a rotor assembly disposed within the motor housing and being axially displaceable between a first position and a second position;
- c) a stator assembly disposed within the motor housing;
- d) a bearing assembly rotatably supporting the rotor assembly;
- e) a friction pack disposed within the motor housing;
- and
- f) a clutch assembly disposed between the friction pack and the rotor assembly;
- and
- g) a spring pack biasing the rotor assembly in a direction towards the friction pack;
- h) wherein, when the stator assembly is de-energized, a spring force provided by the spring pack holds the rotor assembly in the first position and in engagement with the friction pack to prevent the rotor assembly from rotating in a first rotational direction while the clutch assembly allows the rotor assembly to rotate in an opposite second rotational direction;
- i) wherein, when the stator assembly is energized, the rotor assembly is moved relative to the stator assembly into the second position against the spring force of the spring pack and out of engagement with the friction pack such that the rotor assembly is free to rotate.
Dependencies are inferred from the claim text.