초록 ▼

A direct current motor having a primary armature winding, a secondary armature winding and a switching circuit adapted to selectively energize the primary winding and the secondary winding to achieve three-speed motor operation is disclosed. The system is adapted to achieve a high speed of the motor

A direct current motor having a primary armature winding, a secondary armature winding and a switching circuit adapted to selectively energize the primary winding and the secondary winding to achieve three-speed motor operation is disclosed. The system is adapted to achieve a high speed of the motor by energizing only the primary winding, a medium speed of the motor by energizing only the secondary winding, and a low speed of the motor by energizing both the primary winding and the secondary winding. The system also includes a voltage source providing a direct current level voltage with respect to an electric ground and a switching circuit adapted to operate the motor. The switching circuit is coupled to the voltage supply for energizing the primary winding only to achieve a high speed, energizing only the secondary winding to achieve a medium speed, and energizing both the primary winding and the secondary winding in series with each other to achieve a low speed. A method of operating the motor also disclosed.

대표청구항 ▼

[ What is claimed is:] [1.] A motor powered by a direct current voltage source comprisinga primary armature winding;a secondary armature winding; andswitching means coupled to the primary winding, the secondary winding and the voltage source for selectively energizing the primary winding and the sec

[ What is claimed is:] [1.] A motor powered by a direct current voltage source comprisinga primary armature winding;a secondary armature winding; andswitching means coupled to the primary winding, the secondary winding and the voltage source for selectively energizing the primary winding and the secondary winding to achieve three-speed motor operation, whereina first speed of the motor is achieved by energizing both the primary winding and the secondary winding;a second speed of the motor is achieved by energizing only the secondary winding; anda third speed of the motor is achieved by energizing only the primary winding.