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In the 20th century, due to the rapid development of the power industry, the whole industry was looking at the motor and smelling the rotation and roar of the motor, so Hydraulic motor The existence of is largely ignored.

In fact, due to the limitation of the magnetic saturation force, the electric motor can only produce tens of newtons of electromagnetic force per square centimeter, and its magnitude is only 0.1MPa; The working pressure of the hydraulic motor is generally 10MPa, and the difference between the two is dozens or even hundreds of times. Therefore, the torque of the electric motor is very small, and the speed is also very high Reducer Constructed to drive loads.

Hydraulic motors, especially low-speed high torque motors, can directly drive loads. The hydraulic motor has high force density, Cycloidal motor rotor At the same power output, its weight and size are only 5%~20% of that of the DC motor, and its weight is relatively light. Therefore, its rotation inertia is small, its starting, braking, reversing speed and low-speed stability are good, and it is easy to realize stepless speed regulation. These advantages make the DC motor incomparable, In the past 20 years, hydraulic motors and hydraulic technology have been rapidly popularized, applied and popularized around the world. People are increasingly aware of the importance of hydraulic motors in practical work.

In the world's economically and technologically developed countries, the research, development, manufacturing and application of hydraulic motors have always been attached great importance, and have made considerable progress and new achievements. In contrast, China Cycloidal motor with shaft flow distribution Due to the weak technical foundation, people's understanding level is far lower than that of developed countries. There are very few monographs on hydraulic motors written by Chinese people, especially on practical technology of hydraulic motors.