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Torque Motor

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Torque Motor

As shown in Fig. 11.8, a torque motor consists of an armature, two coils, and two pole pieces. The coils are wrapped on the armature, and the armature is mounted such that the ends are positioned in the center of the air gap between the upper and lower pole pieces. Permanent magnets are incorporated in …

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Hydraulic Oscillating Actuator

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Hydraulic Oscillating Actuator

There are some applications in which continuous rotation is not needed. Two examples are industrial mechanisms performing pick-and-place operations and heavy-duty, large-payload robots. Vane motors with one or two vanes are used for limited-rotation applications. The single-vane unit can rotate 280°, and the double-vane 150 to 160°. The direction of rotation is determined by a …

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Geroler Motor (Disc Valve) Performance Characteristics

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Geroler Motor (Disc Valve) Performance Characteristics

The Char-Lynn 10,000 series motor with 40.6 in3/rev displacement was chosen for an example. (Notice that this displacement is approximately 10 times the displacement of the high-speed motors previously studied.) This motor has a maximum speed of 254 rpm for continuous operation. Maximum pressure is 3000 psi. Efficiencies were calculated for an input flow of …

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Hydraulic Piston Motor Efficiency

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Hydraulic Piston Motor Efficiency

The fixed displacement axial piston motor (Sauer-Danfoss Model 90-075 MF), comparable to the variable displacement axial piston pump (Sauer-Danfoss Model 90-075 PV), was chosen. This motor has a maximum speed of 3950 rpm and a rated pressure of 6000 psi. Displacement is 4.57 in3/rev. Efficiencies were calculated for a 36 GPM input flow. Torque efficiency …

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Hydraulic Vane Motor Efficiency

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Hydraulic Vane Motor Efficiency

A Vickers Model 25M (65) vane motor was chosen for the comparison. This motor is rated for 3000 rpm at 2500 psi maximum pressure. It has a displacement of 4.19 in3/rev. Efficiencies were calculated for a 35 GPM input flow. As shown in Fig. 5.4, the torque efficiency for this design is higher than for …

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Hydraulic Gear Motor Efficiency

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Hydraulic Gear Motor Efficiency

The gear pump design can also be used as a motor. The Hydreco Model 1919 motor has a theoretical displacement of 4.53 in3/rev, a maximum pressure rating of 2500 psi, and 3000 rpm maximum speed rating. Efficiencies were calculated for a 36 GPM input flow to the motor (Fig. 5.3). Volumetric efficiency decreases linearly as …

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Sources of Hydraulic Contamination

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Sources of Hydraulic Contamination

There are four sources of contamination in hydraulic fluid. 1. Built-in contamination. This is contaminate that was left in the system when it was assembled. It can range from a piece of teflon tape to a piece of welding slag. 2. Contaminated new oil. Contaminate is introduced during the manufacture and subsequent handling of oil. …

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