Method and apparatus for effecting dynamic braking of a direct current

Abstract

A double pole, double throw switching arrangement for effecting dynamic rotor braking of user controlled operation of a reversible direct current servo motor. Two columns of stationary center and oppositely disposed side contacts are disposed in spaced parallel arrangement on the switch base. One side contact in one column is connected to the opposite side contact in the other column and to the B+ supply. The remaining side contacts in each column are connected to a ground strap having a portion disposed for wiping contact. A pair of commonly user actuated moveable contact members are disposed for sliding contact with each column of contacts. The center contact in each column is connected to one end of a separate forward and reverse motor coil. In the neutral position both motor coil contacts are grounded. User movement of the common actuator in one direction simultaneously causes the moveable contact members to keep one motor coil grounded and connect the other motor coil to B+. User movement of the common actuator in an opposite direction simultaneously causes the moveable contact members to ground the other motor coil and connect the one coil to B+. Upon user release, the actuator returns to the neutral position, grounding both motor coils.