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How to select hydraulic motor

2020-11-12 H:20:08
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At present, the pressure grade of domestic hydraulic motor is divided into 16 MPa, 20 MPa and 25 MPa. How to choose a more suitable model for the working condition of the main engine?

It should be considered to improve the transmission efficiency. For the working conditions of small transmission efficiency, low speed and large torque, the main factor affecting the total transmission efficiency is volumetric efficiency. For the hydraulic devices with the same transmission efficiency, reducing the working pressure of the system can improve the volumetric efficiency. Therefore, the rated pressure of 16MPa should be selected. When the transmission power is smaller and the speed is lower, the lower the working pressure is more favorable 。 In contrast to the working conditions of high transmission power and high speed, the main factor affecting the total transmission efficiency is mechanical efficiency, so the rated pressure of 20 or 25MPa should be selected.

Secondly, for the working conditions with low-speed stability requirements, the larger the displacement of hydraulic motor, the better the low-speed stability. It is also related to the working pressure. The lower the working pressure, the better the low-speed stability.


Hydraulic motor

How to choose a reasonable type of hydraulic motor with the same displacement? This is related to the service conditions and service life requirements. For short-term gap operation conditions, the model with smaller base model can be selected. For machinery with long cumulative operation time and long service life, the model with large base model number should be selected as far as possible, and the high-pressure model should be selected if necessary. The service life of the hydraulic motor can be significantly increased when it is used under the condition of lower working pressure, because the service life of the hydraulic motor is inversely proportional to the working pressure of 3.3 times, that is to say, the service life can be increased by 10 times if the service pressure is reduced by half.

Can marine hydraulic motor replace motor

The main source of potential energy of hydraulic motor is different from that of hydraulic motor.

The electric motor is an electric motor driven by electricity; the hydraulic motor is driven by pressure oil. How can the electric motor drive the hydraulic motor? The advantages of hydraulic motor over motor are as follows:

1. Power density: 45KW motor weight 400-500kg, 45KW hydraulic motor weight may be only 45kg. In some cases, such as the winch of crane, only hydraulic motor can be used;

2. Good control performance: hydraulic control can make the hydraulic motor realize stepless speed change, fast response; this is much better than the motor.





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