Rexroth hydraulic motors are categorized differently from Rexroth hydraulic pumps, which can be divided into Rexroth piston pumps, Rexroth vane pumps and Rexroth gear pumps according to the structure of Rexroth hydraulic pumps, while Rexroth hydraulic motors are generally categorized by the number of revolutions, which can be divided into high speed Rexroth hydraulic motors and low speed Rexroth hydraulic motors in general.
High-speed hydraulic motors with rated revolutions higher than 5 oor/minute are often regarded as high speed hydraulic motors, and the key modes are gear-type, screw-type, vane-type and axial piston type, which are characterized by high revolutions, high power density, small inertia, small displacements, convenient and quick opening, braking, speed regulation and direction change, but the output torque is not large, usually tens to hundreds of Nm(n.m), but the output torque is not large, usually tens to hundreds of Nm(n.m.). M (n.m), in quite a few conditions can not immediately meet the engineering. In many cases, it is not possible to meet the standard of torque on the load immediately, and it is necessary to configure the mechanical deceleration mechanism, thus, the utilization suffers from the corresponding limitation.
The rated value of less than 5oor/minute is often referred to as low-speed motors, low-speed hydraulic motors in general are also standardized.
 (1) When the rpm is less than 1 oor/minute, the rated load can be pushed immediately and run smoothly.
 (2) The basic concept of smooth operation is defined as: the rated load, the motor running out of the number of revolutions in the rate of pulsation, that is, a large pulsation amplitude value of the average number of revolutions should be within ten percent.
 (3) Low-speed motors usually have a large torque angular velocity ratio, generally more than 5n.m.s/rad (Nm.). meter. s/rad)
 Low-speed motor displacement people, the volume is also very large, the revolution in less than a few revolutions per minute or even a few revolutions can still be smooth output thousands or even tens of thousands of N. m. (n. m.) / rad. Meter (n.m) of great torque, so it is also often called low-speed high-torque hydraulic motor. The key ways are multi-function internal curve plunger (ball) plug hydraulic motor and crankshaft linkage type, hydrostatic equalization type radial piston hydraulic motor. It is suitable for immediate coupling and push the load, without the need for external deceleration mechanism, and open, acceleration time is short, good characteristics, due to the output torque, and thus in the engineering machinery and equipment to obtain more and more common use. Hydraulic motors in general are categorized in Table 1-2, in which the swing hydraulic motor is regarded as a swing hydraulic cylinder in many places.