Abstract
Advances in power electronics and microprocessors have provided new opportunities in the application of inverter-motor drive systems. The speed control of AC induction motors can be realized easily by use of an inverter-motor drive at a low cost, high efficiency and wide speed range. From the viewpoint of saving energy, the authors have proposed and developed a new type of variable delivery hydraulic power source with an inverter-motor drive. In this power source, the speed of the fixed displacement pump is controlled by the inverter motor so as to deliver the necessary minimum flow rate for the duty cycles of the servo system.In this system, the system pressure and pump delivery flow rate are estimated indirectly by the state variables of the inverter motor. The principle of the pressure estimation is experimentally confirmed. The programmed control system and digital feedback control system using an estimated system pressure are developed. It is demonstrated that both systems are able to control the hydraulic power source according to the duty cycles of the servo system.
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