Hydraulic five star motor motor small size, small inertia torque, sensitive posture, can be used for frequent replacement occasions, but large leakage, low speed unstable work. Therefore, the vane hydraulic motor is generally used for high speed ratio, small torque and sensitive operation requirements. First, it can be confirmed that the force obtained by the motor of the electric grinding machine is very small, the necessary torque is also very small, and the marginal benefit is fully considered, so there is no need to use the plunger pump motor, and you can choose from the blade motor and the rotary wheel line motor. The motor is light, after all, it is also an iron knot, in the hand, I think it is not very practical, and the motor generally contains the installation of flannel, volume is not too small. I don't know if you have seen the kind of mopping machine commonly used in shopping malls, it is a car, pulled away, and then there is a big soft brush below, can you consider making the polishing brush bigger, for structural reference.