Stall or reduced-speed protection system for electric motor
First Claim
Patent Images
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
76 Citations
20 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14)
-
-
11. 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. - View Dependent Claims (12)
-
-
15. 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. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification