| 摘要 |
<p>Abstract A hydraulic fluid pressure control system comprising: a hydraulic pump motor having an electrical input configured to receive an AC input signal and a hydraulic fluid 5 output configured to output a pressure proportional to the frequency of the AC input signal; and electronic control circuitry connected to said electrical input, wherein: said electronic control circuitry provides an AC input signal of variable frequency. The electronic control circuitry may comprise an inverter. i~. 7 /..10 Fig. 2</p> |
