Comparison of the characteristics of hydraulic motors and electric motors

1. The hydraulic motor can not only rotate forward, but also can be freely changed in reverse rotation, speed change, acceleration, etc., and it is easy to realize stepless speed regulation. In general, the speed ratio (the ratio of the highest speed to the lowest speed) for the hydraulic motor can be as high as 200, while the speed ratio of the electric motor is lower than 50. Because the hydraulic motor has a wide range of speed ratios, it is of great significance to improve the working performance and production efficiency of the machine.

2. Since the output torque of the hydraulic motor is proportional to the oil pressure, when high pressure is used in the system, a higher output torque can be obtained without excessively increasing its mass and volume.

3. Compared with the electric motor, the inertia of the rotating part of the hydraulic motor is small, and the start-up is fast and sensitive. Therefore, it is suitable for high-precision automatic control systems.

4. Due to the viscosity change of the oil, the characteristics of the hydraulic motor can be affected, so the hydraulic motor should not be used in places with severe temperature changes. Hydraulic motors are very sensitive to oil contamination. Therefore, the working oil should be strictly filtered before it can be used. Special attention should be paid to this point in maintenance.