The present disclosure relates to mechanical braking mechanisms used in electric motor applications. The present braking mechanisms may be configured as non-back-drivable mechanical brakes and provide immediate braking of the motors. According to one embodiment, a mechanical brake assembly for an el
The present disclosure relates to mechanical braking mechanisms used in electric motor applications. The present braking mechanisms may be configured as non-back-drivable mechanical brakes and provide immediate braking of the motors. According to one embodiment, a mechanical brake assembly for an electric motor may include a female disk having a curved groove and an abutment. The mechanical brake assembly further includes a male disk having a projection, the male disk being attached to a rotor of the electric motor. When the electric motor is energized, the projection of the male disk is allowed to rotate uninterrupted with the rotation of the rotor. However, when the electric motor is de-energized, the projection of the male disk travels within the curved groove of the female disk and abuts the abutment of the female disk, thereby stopping the rotation of the rotor of the electric motor.
대표청구항▼
1. A mechanical brake assembly for an electric motor, the mechanical brake assembly comprising: a female disk including a curved groove and an abutment; anda male disk including a projection, the male disk being attached to a rotor of the electric motor;wherein, when the electric motor is energized,
1. A mechanical brake assembly for an electric motor, the mechanical brake assembly comprising: a female disk including a curved groove and an abutment; anda male disk including a projection, the male disk being attached to a rotor of the electric motor;wherein, when the electric motor is energized, the projection of the male disk is allowed to rotate uninterrupted with the rotation of the rotor of the electric motor; andwherein, when the electric motor is de-energized, the projection of the male disk travels within the curved groove of the female disk and abuts the abutment of the female disk, thereby stopping the rotation of the rotor of the electric motor. 2. The mechanical brake assembly of claim 1, wherein the curved groove of the female disk is a near-circular groove that terminates at the abutment. 3. The mechanical brake assembly of claim 1, wherein the curved groove has a variable depth. 4. The mechanical brake assembly of claim 3, wherein the depth of the curved groove varies inversely with respect to the distance from the abutment. 5. The mechanical brake assembly of claim 1, wherein the projection has sloped walls and an arched cross-sectional shape. 6. The mechanical brake assembly of claim 1, wherein, when the projection of the male disk abuts the abutment of the female disk to stop the rotation of the rotor, the mechanical brake assembly prevents the motor from back-driving. 7. The mechanical brake assembly of claim 1, further comprising a housing, a disk stop, a compression spring, and at least one washer, wherein the compression spring and at least one washer are positioned between the disk stop and the female disk within the housing. 8. The mechanical brake assembly of claim 7, wherein the housing includes ears for allowing the housing to be attached to a bearing bracket assembly, which supports the mechanical brake assembly and electric motor. 9. The mechanical brake assembly of claim 7, wherein the female disk further includes a ridge that is pressed against an inner front surface of the housing by the compression spring. 10. The mechanical brake assembly of claim 9, wherein, when the projection of the male disk initially abuts the abutment of the female disk, the female disk is configured to rotate up to 1° within a plane perpendicular to a longitudinal axis of the female disk. 11. An alternating-current (AC) permanent split capacitor (PSC) reversible motor attached to the mechanical brake assembly of claim 1. 12. The AC PSC reversible motor of claim 11, comprising a shaft mechanically engaged with a gear assembly. 13. The AC PSC reversible motor of claim 12, wherein the AC PSC reversible motor and gear assembly are configured to control closing and opening operations of a valve actuator. 14. A method of operating an electric motor having a rotor and a stator axially offset from each other in a steady state, the method comprising: providing electrical power to a stator of an electric motor to create a magnetic field;applying a first force on a rotor of the electric motor to move the rotor in a first direction along an axial path to achieve a greater extent of alignment with the stator;wherein moving the rotor to achieve the greater extent of alignment causes a projection of a male disk attached to the rotor to exit a groove of a female disk to allow uninterrupted rotation of the rotor;wherein, when electrical power is no longer provided to the stator, the method further comprises applying a second force on the rotor to move the rotor in a second direction opposite to the first direction to cause the projection to enter the groove of the female disk and abut an abutment of the female disk, thereby stopping the rotation of the rotor of the electric motor. 15. The method of claim 14, wherein the groove of the female disk is a near-circular curved groove that terminates at the abutment. 16. The method of claim 14, wherein causing the projection of the male disk to abut the abutment of the female disk to thereby stop the rotation of the rotor further comprises preventing the motor from back-driving.
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