| 摘要 |
PROBLEM TO BE SOLVED: To enable sound generation by operation of a pump to be suppressed and a cost for a pump and a hydraulic driving apparatus to be reduced. SOLUTION: The apparatus comprises a motor, and a pump equipped with a cylinder block wherein plural of cylinders are installed, a piston positioned in such a way as capable of moving go-and-back and a control part for adding pulse-controlling signals, ur, vr and wr, to a driving-direction signal for driving a motor by generating pulse-controlling signals, ur, vr and wr, having the same frequency with a pulse frequency of a pump calculated by a rounding speed of a pump and the number of cylinders. Because of addition of the pulse-controlling signals, ur, vr and wr, to the driving-direction signal for driving a motor, an impact by change of discharge pressure can be reduced. Generation of pulse in discharge pressure of a pump can be suppressed and further, generation of sound can also be suppressed. COPYRIGHT: (C)2010,JPO&INPIT
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