초록 ▼

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)

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.

대표청구항 ▼

In an electrically operated dual motor drive system having first and second reversible traction motors (14,16) driven by a power source (18), the improvement comprising: first motor control circuit means (10) having a first set of normally open contacts (32a,32b) connected in a series circuit from t

In an electrically operated dual motor drive system having first and second reversible traction motors (14,16) driven by a power source (18), the improvement comprising: first motor control circuit means (10) having a first set of normally open contacts (32a,32b) connected in a series circuit from the power source (18) through the first motor (14) in a first direction, and having a second set of normally closed contacts (34a,34b) connected in a series circuit from the power source (18) through the first motor (14) in a second direction opposite said first direction; second motor control circuit means (12) having a first set of normally closed contacts (40a,40b) connected in a series circuit from the power source (18) through the second motor (16) in said first direction, and having a second set of normally open contacts (38a,38b) connected in a series circuit from the power source (18) through the second motor (16) in said second direction; a first coil (36) connected to complementally operate both sets of contacts (32a,32b,34a,34b) in the first motor control circuit (10); a second coil (42) connected to complementally operate both sets of contacts (38a,38b,40a,40b) in the second motor control circuit (12); controller means (24) for selectively energizing said first and second coils (36,42) to control actuation of the contacts in the first and second motor control circuit means (10,12) respectively, said system further comprising a line switch (20) coupled between the power source (18) and the first and second motors (14,16); sensing means (74,76,78,86,87) for detecting preselected system conditions and delivering signals to said controller means (24) in response to said detected conditions; and said controller means (24) being adapted for receiving said signals and controllably operating said line switch (20) in response to said received signals.