Rotor pump

Japanese engineers at Daikin have produced a highly integrated pump and motor

When Japanese engineers at Daikin sat down and looked at how conventional hydraulic systems are designed, they realised that they could create a system that would have greater power in a smaller volume and a lower noise level too.

The result of their deliberations is the Rotor-Pump. This new design integrates the well proven axial piston pump and an electric motor. The conventional structure of a motorised pump unit consists of an electric motor, hydraulic pump, bellhousing and a drive coupling. But this arrangement can have several disadvantages, including the size, noise level and assembly cost.

Daikin engineers came up with the idea of using the rotor of the electric motor to incorporate the pump piston cylinder block assembly (Figure 1). Hence the name Rotor-Pump. The Japanese innovation itself is protected by 14 patents.

According to UK distributor GH/D Hydraulics, the reason for the success of the Rotor Pump stems from the fact that the length of the whole unit is reduced by 40% compared to conventional pumps.

What is more, because of the smaller size and the lack of a mounting bracket, bell housing and drive coupling found on more conventional units, the weight is also diminished.

The noise level of the Rotor Pump is also very low. The company claims that the noise levels are 10-15 dBA lower than that of conventional axial piston pump assemblies. And because of the arrangement of the axial piston pump in the electric motor, there is no leakage either.

{{GH/D Hydraulic SystemsTel: 0161-864 3167Enter 440}}