Stall or reduced-speed protection system for electric motor
AssigneeSiemens Electric Limited
InventorsJohn E. Makaran, Jerzy Muszynski
Life of this patent
Estimating the term…
Abstract
A protection system for an electric motor is disclosed. The system is adapted for providing protection to the motor in the event of a stall or reduced-speed condition. The system includes a sensor providing a first signal representative of the speed of the motor, a detection circuit receiving the first signal and providing a second signal indicative of whether the motor is in a stall or reduced-speed condition, and a switching circuit receiving the second signal and interrupting power supply to the motor when the second signal indicates that the motor is in the stall or reduced-speed condition.
Claims20
A protection system for an electric motor, which comprises:
- a sensor providing a first signal representative of a speed of the motor;
- a detection circuit receiving the first signal and providing a second signal indicative of whether the motor is in a stall or reduced-speed condition;
- and
- a switching circuit receiving the second signal and interrupting supply of power to the motor when the second signal indicates that the motor is in the stall or reduced-speed condition, wherein said sensor, said detection circuit and said switching circuit are incorporated into the motor.
A protection system for an electric motor which comprises:
- sensor means for providing a first signal representative of a speed of the motor;
- detection means for receiving the first signal and for providing a second signal indicative of whether the motor is in a stall or reduced-speed condition;
- and
- switching means for receiving the second signal and for interrupting supply of power to the motor when the second signal indicates that the motor is in the stall or reduced-speed condition;
- and
- said electric motor having a housing wherein said sensor means and one of said detection means and said switching means are disposed within said housing.
An electric motor comprising:
- a housing for housing a first magnet and a second magnet, said housing including an endcap;
- a sensor providing a first signal representing motor speed, said sensor being disposed in between said first and said second magnets;
- a detector for receiving said first signal and providing a second signal indicative of whether the motor is in a stall or a reduced-speed condition;
- and
- a switch for switching off said motor when said second signal indicates that the motor is in said stall or reduced-speed condition, wherein at least one of said detector and said switch is disposed within said housing.
Dependencies are inferred from the claim text.