| 摘要 |
A control arrangement for driving a hydraulic motor in which the input signal is derived from a pulse generator. A step motor converts the pulses from the pulse generator into mechanical position and positions correspondingly a servo valve. The output shaft of the hydraulic motor is also connected to the servo valve which compares the outputs of the step motor and hydraulic motor, and adjusts a hydraulic pump through a displacement cylinder so that the output of the hydraulic motor is substantially equal to the output of the step motor.
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