Electric motor with braking arrangement

Details Electric motor with braking arrangement Electric motor with braking arrangement

1982-08-06

1984-07-17

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 41, 188 69, H02K 710

Patent

active

044608381

ABSTRACT:
An electric motor having an improved braking arrangement is disclosed. The braking arrangement includes a stop pawl armature assembly disposed coaxially upon the rotor shaft of the motor for axial movement with respect thereto in response to the magnetic field created by the stator assembly of the motor. The braking arrangement further includes a stop member disposed on the rotor shaft arranged to normally rotate therewith. The stop member functions in the nature of a slip clutch, and is adapted to cooperate with the armature assembly for effecting braking of the motor. During motor operation, the armature assembly is shifted by the magnetic field of the motor stator assembly so that a pawl portion of the armature assembly is moved out of the rotational path of a lobe portion of the stop member. When the motor is switched off, the pawl portion of the armature assembly is moved into the path of the lobe portion, and is engaged thereby. The stop member permits limited continued rotation of the motor rotor until the torque of the rotor shaft drops below the torque-carrying capacity of the stop member slip clutch, at which time the shaft stops rotating and is firmly held against continued rotation.

REFERENCES:
patent: 2938606 (1960-05-01), Passman
patent: 3032667 (1962-05-01), Sorchy
patent: 3784852 (1974-01-01), Noly

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