Types of motors 1 gear motors 2 vane motors 3 piston

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Types of Motors: 1. Gear motors 2. Vane Motors 3. Piston motors
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1.Gear motors: A gear motor developing torque due to hydraulic pressure acting on the surfaces of the gear teeth. As the teeth are subject to high pressure, they tend to rotate the gears. Like a gear pump, volumetric displacement of the gear motor is fixed.
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2. Vane motors: A vane motor consisting of vanes sliding in and out of a rotor connected to the driving shaft. Vanes at inlet side are subject to HIGH PRESSURE and at outlet side are subject to LOW PRESSURE. This results in a net pressure force on the vane creating a torque on the rotor shaft. As the rotor revolves the vanes follow the surface of the cam ring which are forced radially outward by using springs. These springs are essential to hold the vanes against the centrifugal force that develops when the rotor rotates.(In some designs, pressure loaded vanes are used instead of springs). The sliding action of the vanes form sealed chambers which carry the fluid from the inlet and outlet.
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3. Piston motors: The torque is generated by pressure acting on the ends of the pistons reciprocating inside a cylinder block. Fluid under pressure at inlet. Piston motors are available as both fixed or variable displacement type.
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Performance of Hydraulic Motors Gear motors typically have an overall efficiency of 70 75% Vane motors which have 75 85% Piston motors having 85 95%.
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