The hydraulic motor of 3.5 square flat head mixer is a device that converts the pressure energy of liquid into mechanical energy. What are the characteristics of the hydraulic motor?

(1)液壓泵在結構上需保證具有自吸能力，而液壓馬達就沒有這一要求。

(1) The structure of the hydraulic pump needs to ensure that it has self-priming capacity, but the hydraulic motor does not have this requirement.

(2)葉片泵依靠葉片跟轉子一起高速旋轉而產生的離心力使葉片始終貼緊定子的內表面，起封油作用，形成工作容積。若將其當馬達用，必須在液壓馬達的葉片根部裝上彈簧，以保證葉片始終貼緊定子內表面，以便馬達能正常起動。

(2) The vane pump relies on the centrifugal force generated by the high-speed rotation of the vane and the rotor, which makes the vane always close to the inner surface of the stator, plays the role of sealing oil, and forms the working volume. If it is used as a motor, a spring must be installed at the root of the blade of the hydraulic motor to ensure that the blade is always close to the inner surface of the 

stator, so that the motor can start normally.

(3)液壓馬達要求能在很寬的轉速范圍內正常工作，因此，應采用液動軸承或靜承。因為當馬達速度很低時，若采用動承，就不易形成潤滑滑膜。

(3) Hydraulic motor is required to work normally in a wide speed range, so hydraulic bearing or hydrostatic bearing should be used. Because when the motor speed is very low, if the use of dynamic bearing, it is not easy to form lubricating film.

(4)為了減小吸油阻力，減小徑向力，一般液壓泵的吸油口比出油口的尺寸大。而液壓馬達低壓腔的壓力稍高于大氣壓力，所以沒有上述要求。

(4) In order to reduce the suction resistance and radial force, the suction port of hydraulic pump is larger than the outlet port. The pressure of the low pressure chamber of the hydraulic motor is slightly higher than the atmospheric pressure, so there is no such requirement.

(5)液壓馬達一般需要正反轉，所以在內部結構上應具有對稱性，而液壓泵一般是單方向旋轉的，沒有這一要求。

(5) The hydraulic motor generally needs forward and reverse rotation, so it should have symmetry in the internal structure, while the hydraulic pump generally rotates in one direction, so there is no such requirement.

(6)液壓馬達必須具有較大的起動扭矩。由于液壓馬達與液壓泵具有上述不同的特點，使得很多類型的液壓馬達和液壓泵不能互逆使用。

(6) The hydraulic motor must have a large starting torque. Due to the above different characteristics of hydraulic motor and hydraulic pump, many types of hydraulic motor and hydraulic pump can not be used in reverse.