Archive for December, 2010

Electro-Hydraulic Stepping Motors

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Electro-Hydraulic Stepping Motors

An electro-hydraulic stepper motor (EHSM) is a device, which uses a small electrical stepper motor to control the huge power available from a hydraulic motor (Figure 4.10). It consists of three components: 1. Electrical stepper motor 2. Hydraulic servo valve 3. Hydraulic motor. These three independent components when integrated in a particular fashion provide a …

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Limited Rotation Hydraulic Motor

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Limited Rotation Hydraulic Motor

A limited rotation hydraulic motor provides a rotary output motion over a finite angle. This device produces a high instantaneous torque in either direction and requires only a small amount of space and simple mountings. Rotary motors consist of a chamber or chambers containing the working fluid and a movable surface against which the fluid …

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Hydrostatic Hydraulic Pumps

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As the name implies, these pumps discharge a fixed quantity of oil per revolution of the pump shaft. In other words, they produce flow proportional to their displacement and rotor speed. A majority of the pumps used in fluid power applications belong to this category. These pumps are capable of overcoming the pressure that results …

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Non-Positive Displacement Hydraulic Pumps

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Non-Positive Displacement Hydraulic Pumps

They are also known as hydro-dynamic pumps. In these pumps the pressure produced, is proportional to the rotor speed. In other words, the fluid is displaced and transferred using the inertia of the fluid in motion. These pumps are incapable of withstanding high pressures and are generally used for low-pressure and high-volume flow applications. Normally …

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