high speed hydraulic motor


Hydraulic motor makes the hydraulic system output speed and torque, drive the working parts to rotate, in principle, the hydraulic pump and hydraulic motor in the hydraulic system is by the change of closed volume to work, in principle is reversible, but the structure is different, can not be universal, so what is a high-speed hydraulic motor?


Rated speeds higher than 500rpm are often regarded as high-speed hydraulic motors, and the main forms are gear, spiral, vane and axial piston types. It is characterized by high speed, high power density, small moment of inertia, small displacement, convenient starting, braking, speed regulation and commutation, but the output torque is not large, usually tens to hundreds of Nm. In quite a few cases, the torque requirements of the engineering load cannot be directly met, and a mechanical reduction mechanism is required, so its use is limited to a certain extent.


Hydraulic motors attach great importance to their starting performance. Under the same working pressure, the output torque of the hydraulic motor from the stationary state to the starting state is less than the torque in operation, which makes it difficult for the hydraulic motor to start with load. The main reason for the decrease in starting torque is that the static friction coefficient of the object is large, and once it slides, the friction coefficient is significantly reduced, which is determined by the general nature and law of mechanical friction. The starting performance of hydraulic motors of different structures is different. After comparison, the starting performance of multi-acting internal curve hydraulic motor is good.


When the working speed of the hydraulic motor is too low, the uniformity of operation cannot be guaranteed, resulting in an unstable state of fast, slow, moving and stopping, which is the so-called crawling phenomenon. The cause of the crawling phenomenon is related to the characteristics of frictional resistance at low speeds. In addition, the displacement and leakage of the hydraulic motor itself also fluctuate periodically with the phase angle of the rotor rotation, which will also cause fluctuations in the motor speed. At low speeds, this fluctuation is difficult to be masked by the moment of inertia and clearly displayed, forming a crawling phenomenon.


When choosing a high-speed hydraulic motor, the following issues need to be considered:


1. Hydraulic motor speed range.


2. Starting torque and continuous working torque of hydraulic motor.


3. The working force of the hydraulic motor (for example, driving the fan is not an ordinary hydraulic motor, and the thrust or pull force received by the motor should be considered)


4. Hydraulic motor oil circuit, there is a series of columns, then pay special attention.


5. Installation space and design cost. High-speed motors generally use plunger motors, of course, gear motors are also used in many places, and vane motors are also high-speed motors, but they are not common.


Hope the above content will be helpful to you, if you have the need to buy high-speed hydraulic motor, you can contact Hanjiu, Hanjiu is the largest hydraulic products production company in northern China, and has a lot of experience in the production of hydraulic products to ensure that all product quality is worry-free.


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