Control circuit for an electric vehicle traction motor

Details Control circuit for an electric vehicle traction motor Control circuit for an electric vehicle traction motor

1977-12-15

1980-02-12

Rubinson, Gene Z.

Electricity: motive power systems

Braking

Dynamic braking

318379, 318139, H02P 312

Patent

active

041885694

ABSTRACT:
A control circuit for an electric vehicle traction motor having separate armature and field windings, includes an armature winding current control, a braking contact which is in series with the armature winding and which is closed or opened in accordance with whether motoring or braking is required, an alternative path being provided for motor current during braking, reversing switch means connected in circuit with the field winding, a field current control and logic circuit means arranged to operate during a change for braking mode to motoring mode so as sequentially to reverse said reversing switch means when the field current is below a predetermined level, commence field current flow in the required direction for motoring and then close the brake contact whereby any residual magnetism in the field structure is reversed before the brake contact is closed.

REFERENCES:
patent: 3989990 (1976-02-01), Thompson
patent: 4008423 (1977-02-01), Christianson et al.
patent: 4066939 (1978-01-01), Joyes

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