|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||417/044.2; 417/044.1; 417/042; 417/280; 417/476; 092/072|
|§371/§102 date||20030312 (20030312)|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 39 인용 특허 : 10|
The invention provides a variable speed hydraulic pump designed to operate at a maximum horsepower throughout its pressure range by adjusting motor speed according to motor load parameters. In particular, the variable speed hydraulic pump includes a hydraulic pump unit coupled to a variable speed electric motor by a drive unit and to a hydraulic fluid tank for pressurizing and pumping hydraulic fluid when operated by the motor. A motor controller is electrically connected to the motor to supply drive signals to the motor based on electrical characteristi...
1. A variable speed hydraulic pump, comprising:a variable speed electric pump drive motor; a hydraulic pump unit coupled to the electric motor and a hydraulic fluid source for pumping hydraulic fluid when operated by the motor; and a motor controller electrically connected to the motor for supplying an electrical drive signal to the motor in response to an electrical motor load signal characteristic of said drive signal which varies dependent on the torque exerted by said motor, said electrical motor load signal characteristic being detected by said moto...