| 摘要 |
<p>An electric-motor hydraulic pump (10) includes a housing (12) having a stationary internal shaft (14). A pair of cylinder blocks (16,18) are rotatably carried by the shaft (14) within the housing (12), and an array of pistons (22) are slidably disposed with each cylinder block. A yoke plate (20) is mounted within the housing (12) and engages the pistons (22) for determining displacement of the pistons within the cylinder blocks (16,18). Fluid inlet and outlet ports (28) are provided in the housing (12) and are coupled to the cylinder blocks (16,18). An induction motor (30,32) includes a rotor (34) carried by the cylinder block (16,18) for corotation therewith, and a stator (36) mounted within the housing (12) surrounding the rotor. An electronic controller for controlling outlet fluid pressure and flow from the pump (10) includes a plurality of sensors (46,56,58,60) mounted on the housing (12) for sensing operating characteristics of the pump and motor to provide electronic sensor signals as functions thereof. Control electronics (96) are responsive to the sensor signals for controlling fluid pressure and flow from the pump by varying effective displacement of the pump, and by varying the electrical power (current and frequency) applied to the motor. <IMAGE></p> |
