Dynamic braking of direct current motors

Details Dynamic braking of direct current motors Dynamic braking of direct current motors

1977-02-16

1978-05-30

Schaefer, Robert K.

Electricity: motive power systems

Braking

Plural, diverse or diversely controlled braking means

318377, 318381, H02P 312

Patent

active

040925773

ABSTRACT:
A braking system for, primarily, separately excited D.C. traction motors, in which rheostatic braking is effected by field reversal to generate armature current freewheeling through the low impedance supply and through a brake resistor in series with the armature. A contactor shorts out the brake resistor for normal motoring. Field excitation in conjunction with armature current or armature voltage polarity reversal is detected to indicate the motor generating function, lock open the motoring contactor and prevent short circuiting of the motor/generator. Plug braking by energisation of the armature supply is thus always permissible either by brake handle and power handle or reverse handle and power handle. The armature current then contains a rheostatic braking component and a tractor braking component. What would normally be mis-use of the reversing control to achieve rapid deceleration thus becomes acceptable.

REFERENCES:
patent: 3525027 (1970-08-01), Weiser
patent: 3532951 (1970-10-01), Hovance
patent: 3555385 (1971-01-01), Risberg
patent: 3866098 (1975-02-01), Weiser

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