| 摘要 |
<p>An electrically operated dual motor drive system having first and second reversible traction motors (14, 16) driven by a power source (18). Motor control circuitry (10, 12) for controlling the direction of current flow through the motors (14, 16) is designed to be actuated by only two coils (36, 42). Preferably, control circuits (10, 12) employ an arrangement of normally open (32a, 32b, 38a, 38b) and normally closed (34a, 34b, 40a, 40b) contacts such that the two motors (14, 16) operate in reverse directions in the event of a complete system malfunction. A line contactor (20) is advantageously utilized to simultaneously serve as a main power disconnect for a variety of motors within the system. The present invention overcomes the disadvantages of the prior art techniques through the provision of uniquely designed motor control circuitry which is selectively activated by only two coils (36, 42) instead of the previously used four, thereby resulting in substantial cost and space savings.</p> |
