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Axial plunger Motors
It is a motor which makes use of hydraulic cylinder for generating motion. Since the piston of this motor is attached to a rotatory axle, the motor is also referred to as the rotating piston motor. The hydraulic pressure pushes the piston and help in turning the rotor. When the piston is completely released or pushed out, the oil is discharged; this discharge of oil enables the motor to turn around.
Radial Piston Motors
These motors are available in two types, namely the crankshaft type and the multi-lobe cam ring type. A crankshaft motor possesses a single cam piston that is pushed inwards. The motor is marked by high starting torque characteristics. A multi-lobe cam ring motor possesses multiple lobes and a piston which moves in an outward manner in a direction opposite to the cam rings. This motor has the capability to generate high amount of power. It runs smoothly if installed in low-speed applications. The motor is characterized by a high starting torque; it is capable of producing a smooth output.
A vane motor is capable of producing rotating motion in either clockwise or counterclockwise direction. The parts of vane motor include a drive shaft, slotted rotor, rectangular vanes fitted in slots on rotors and other parts which hold together this assembly. The vanes freely slide in and out of the rotor while the latter moves in a circular motion. Compressed air is forced into the assembly through an inlet port. This compressed air moves the rotor in a counterclockwise direction. The pressure on air is reduced after it moves the rotor. This air is then released into the atmosphere through the outlet port.
Hydraulic Gear Motor
This kind of motor is used in external gear pumps and is also known as external gear motor. The motor is fitted with two gears which rotate against each other. One of the gears is powered by an inflow of fluid which enters through an inlet; the power from the first gear is transferred into the second one and both gears are set into motion. The fluid moves inside the casing, travels along the periphery of gears and finally reaches the other side (of gears). The fluid is removed from the casing through an outlet. This type of motor is known for its low efficiency.