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Hydraulic Motor and Its Types
Hydraulic motor is a motor that converts the kinetic or potential energy of a fluid into mechanical energy. It is a mechanical actuator that converts hydraulic pressure and flow into torque and angular displacement.
It can rotate in reverse direction and act as a pump when powered by a mechanical source. Although a hydraulic motor can be interchangeable with a hydraulic pump sometimes, most often, hydraulic pumps cannot be used as hydraulic motors because they cannot be backdriven. The hydraulic drive system can be formed by hydraulic pumps, motors, and cylinders.
There are many hydraulic motor types which are the most important operating specification to consider when searching for hydraulic motors. The first one is the gear and vane motors. They can be used in simple rotating systems. A vane motor consists of a housing with an eccentric bore, in which runs a rotor with vanes in it that slide in and out. It uses a vane to generate mechanical energy. Pressurized fluid strikes the blades in the vane, causing it to rotate and produce output torque. While a gear motor consists of two gears, i.e. the driven gear and the idler gear. The second type is the axial piston motor which is generally used for high quality rotating drive systems. It uses an axially-mounted piston to generate mechanical energy. High pressure flow into the motor forces the piston to move in the chamber, generating output torque. The third one is the radial piston motors which are available in Crankshaft type and the Multilobe cam ring type. This motor uses pistons mounted radially about a central axis to generate energy.
Addition to the above mentioned elements, there are still many aspects to consider when searching for hydraulic motors. It includes the operating torque, operating pressure, operating temperature, operating speed, and the maximum fluid viscosity, etc. As to the operating torque, it depends directly on the pressure of the working fluid delivered to the motor. And the operating pressure is the pressure of the working fluid that is pressurized by an outside source delivered to the hydraulic motor. The operating temperature is the fluid temperature range the motor can accommodate. The operating speed is the speed at which the hydraulic motors' moving parts rotate.
Undoubtedly, hydraulic motors can be widely used in many applications such as winches and crane drives, roll mills, self-driven cranes, and excavators and so on. Therefore, it is rather necessary to take all the above mentioned aspects into consideration when you choose the hydraulic motors.
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