Power and total efficiency of the hydraulic motor

Power and total efficiency of the hydraulic motor
The actual input power of the hydraulic motor is PQM and the actual output power is t ω。 Total motor efficiency η M: The ratio of actual output power to actual input power The hydraulic motor has two circuits: the hydraulic motor series circuit and the hydraulic motor braking circuit, and these two circuits can be classified at the next level. One of the hydraulic motor series circuits: connect the three hydraulic motors in series with each other, and use a directional valve to control their start, stop and steering. The flow of the three motors is basically the same. When their displacement is the same, the speed of each motor is basically the same. It is required that the oil supply pressure of the hydraulic pump is high, and the flow of the pump can be small. It is generally used in the occasion of light load and high speed. Hydraulic motor series circuit 2: each reversing valve in this circuit controls a motor. Each motor can act alone or at the same time, and the steering of each motor is also arbitrary. The oil supply pressure of the hydraulic pump is the sum of the working pressure difference of each motor, which is suitable for high-speed and small torque occasions. One of the parallel circuits of hydraulic motors: two hydraulic motors are controlled by their respective directional valves and speed regulating valves, which can operate simultaneously and independently, regulate speed respectively, and keep the speed basically unchanged. However, with throttling speed regulation, the power loss is large. The two motors have their own working pressure difference, and their speed depends on the flow they pass through. Hydraulic motor parallel circuit 2: the shafts of the two hydraulic motors are rigidly connected together. When the change-over valve 3 is in the left position, motor 2 can only idle with motor 1, and only motor 1 outputs torque. If the output torque of motor 1 cannot meet the load requirements, place valve 3 in the right position. At this time, although the torque increases, the speed should be reduced accordingly. Hydraulic motor series parallel circuit: when solenoid valve 1 is energized, hydraulic motors 2 and 3 are connected in series. When solenoid valve 1 is powered off, motors 2 and 3 are connected in parallel.When the two motors are connected in series through the same flow, the speed is higher than that when they are connected in parallel. When they are connected in parallel, the working pressure difference of the two motors is the same, but the speed is lower.(hydraulic motor)