Dynamic braking circuit for universal motor

Details Dynamic braking circuit for universal motor Dynamic braking circuit for universal motor

1987-04-24

1988-06-14

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

318381, H02P 308

Patent

active

047514140

ABSTRACT:
A dynamic braking circuit for a universal motor is disclosed. A switching mechanism is used to reverse the orientation of the series field winding with respect to the rotor when power is removed. Because the rotor acts as a generator when power is removed, it will generate current to the field winding. Because the orientation of the field winding has been reversed, the field winding will thus try to make the motor run in the opposite direction, thereby exerting a braking force on the motor. The amount of the braking force is limited by using a portion of a second winding to oppose the reversed action of the first winding.

REFERENCES:
patent: 2507918 (1950-05-01), Mageoch
patent: 4144482 (1979-03-01), Schwab
patent: 4445596 (1984-05-01), Waters et al.

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