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An electrohydraulic control system that includes a bidirectional electric motor responsive to application of electrical power for rotation in either of two directions, and a hydraulic pump coupled to the motor and having ports for supplying hydraulic fluid in either of two flow directions as a funct

An electrohydraulic control system that includes a bidirectional electric motor responsive to application of electrical power for rotation in either of two directions, and a hydraulic pump coupled to the motor and having ports for supplying hydraulic fluid in either of two flow directions as a function of direction of rotation of the electric motor. A hydraulic actuator is coupled to the pump for receiving fluid in either of two flow directions and performing work as a function thereof. An electronic controller applies electrical power to the electric motor so as to obtain a desired level of work at the actuator. The electronic controller includes one or more sensors operatively coupled to the actuator for applying electrical power to the motor as a function of motion at the actuator. The bidirectional electric motor in the preferred embodiments of the invention comprises a fluid-cooled motor, and the system includes valves for routing hydraulic fluid through the motor housing between the pump and the actuator.

대표청구항 ▼

[ We claim:] [23.] An electrohydraulic control system that comprises:bidirectional electric motor means responsive to application of electrical power for rotation in either of two directions,hydraulic pump means coupled to said electric motor means and having ports for supplying hydraulic fluid in e

[ We claim:] [23.] An electrohydraulic control system that comprises:bidirectional electric motor means responsive to application of electrical power for rotation in either of two directions,hydraulic pump means coupled to said electric motor means and having ports for supplying hydraulic fluid in either of two flow directions as a function of direction of rotation of said electric motor means,hydraulic actuator means coupled to said ports of said hydraulic pump means for receiving fluid in either of two flow directions and performing work as a function thereof, andelectronic control means for applying electrical power to said electric motor means so as to obtain a desired work at said actuator means,said bidirectional electric motor means having a motor output shaft, and said hydraulic pump means comprising bidirectional hydraulic pump means coupled to said shaft,said bidirectional hydraulic pump means comprising a pair of unidirectional hydraulic pumps and a pair of directional couplers respectively connecting said pumps to said motor output shaft such that said pumps are alternately coupled to said shaft as a function of direction of rotation of said shaft, each of said unidirectional pumps having an inlet port and an outlet port, and said system further comprising valve means responsive to direction and/or pressure of hydraulic fluid flow for controlling fluid flow between said actuator means and said pump ports.