# How to choose hydraulic motor

Update:27-02-2019
Abst:

The four technical indicators commonly used in hydrauli […]

The four technical indicators commonly used in hydraulic motors are as follows:

1, traffic

1 The hydraulic oil is injected into the hydraulic motor. The injected hydraulic oil is measured by the “flow rate”, which is the volume of hydraulic oil injected into the motor for one minute, and the unit is “L/min”.

2The hydraulic oil will flow out after being injected into the motor. Otherwise, the hydraulic oil will accumulate inside the motor, which is to cause an explosion. In theory, the flow rate of the hydraulic oil injected into the motor and the flow from the hydraulic motor are equal.

3 flow and motor output shaft speed are related, they are proportional relationship, then we get another invisible parameter of the motor called displacement, that is, the hydraulic pressure injected or discharged when the motor rotates one revolution Oil volume in units of "ml/r".

4 The size of the hydraulic motor is measured by displacement, so the size of the motor refers to the displacement.

5 The flow rate of the hydraulic motor can be measured by the flow meter. Almost every hydraulic system is equipped with a flow meter to monitor the flow changes of the hydraulic system at any time.

2, pressure

1 After the hydraulic oil is injected, the motor should be driven to rotate, so the hydraulic oil needs a certain pressure, that is, a force is required to drive the hydraulic motor to rotate. This driving force is pressure. Their unit is not “N” but “MPa”. This is a pressure unit, but in hydraulic pressure the pressure is usually called pressure.

2 The hydraulic motor pressure is determined by the load and is not generated by the motor.

3 The rated pressure of the motor is the allowable pressure value when the motor is running continuously.

4 The pressure is measured by a pressure gauge. The range of the pressure gauge is selected according to the maximum pressure of the hydraulic system. It is better to reserve several pressure gauge interfaces when designing the hydraulic system so as to monitor the pressure change of the system at any time.

3, the speed

1 The speed of the hydraulic motor is a parameter to measure the speed of rotation of the motor output shaft, which is generally determined by the customer according to the operating speed of the equipment.

2 The classification of hydraulic motors is defined according to the speed, divided into high-speed motors and low-speed motors. High-speed motors are generally more than 500 rpm, and low-speed motors are rpm below 500 rpm.

3 Hydraulic motors generally have a minimum stable speed below which the motor will creep.

4, torque

1 The output shaft of the motor is to drive the mechanical parts to rotate. Therefore, the motor must have a certain driving force to drive the mechanical parts. What is the parameter to measure the driving force of the motor? "Torque", the unit "Nm" Is the force acting on a force arm of a certain length.

2 The amount of torque of the motor is determined by the load. How much torque is required to drive the load, and how much torque the motor will provide. If the torque required by the load is too large, the motor will have a fixed load, and then the motor will come. Said to be overloaded.

3 Torque measurement is measured with a torque meter. For a hydraulic motor, the energy generated by the hydraulic oil injected into the hydraulic motor and the energy generated by the output shaft of the motor are theoretically equal. This is the energy conservation of the motor, that is, the power input and output of the motor are equal. It can be expressed by the following formula: P hydraulic oil = P output shaft. a, hydraulic oil power = flow X pressure b, output shaft power = torque X angular velocity c, flow X pressure = torque X angular velocity after calculation: flow X pressure = torque X2πX speed known from the above formula, as long as know With any three parameters, you can get the size of another parameter. The motor selection is calculated using this formula.

0