Abstract
This chapter presents the hydraulic pumps and motor and describes the design and construction of various motors used in hydraulics. The chapter explains the operation of the various hydraulic motors such as gear, vane, and piston motors; it also evaluates their performance by determining their mechanical, volumetric, and overall efficiencies. Hydraulic motors can be of limited rotation or continuous rotation type. Limited rotation motors are called oscillation fluid motors as they produce a reciprocating motion. Continuous rotation motors are in reality pumps that have been redesigned to withstand the different forces that are involved in motor applications. An electro-hydraulic stepper motor (EHSM) is a device that uses a small electrical stepper motor to control the huge power available from a hydraulic motor. The chapter explains the three components of an EHSM: electrical stepper motor, hydraulic servo valve, and hydraulic motor.
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