Oil pump

with brushless DC motorfor automotive applicationsfor engine

For hybrid drives and engines with automatic start-stop, the use of electric gear oil pumps is indispensable if hydraulic pressure has to be maintained in the subsystems after the internal combustion engine has been switched off. Electrical oil pump can be used also in combination with mechanical oil pump of the engine as a booster pump, or in any case is needed oil pressure to actuate devices independently from the thermal engines. For the development of new oil pumps, Pierburg Pump Technology exploits synergies with the electrical water pumps and thus cuts costs and development time while at the same time boosting reliability. By integrating the electric motor and hydraulics, installation size, weight and complexity have been reduced. This way, Pierburg Pump Technology is able to realize integrated electric oil pumps based on 50 W to over 400 W motors. By way of example, Figure 7. shows the X20 oil pump based on a 200 W motor and already in mass production. Depending on the requirements, the electronics, which primarily ensures the sensorless commutation of the brushless DC motor, can be implemented in a separate control unit or integrated in the pump housing. Like sensorless rotor position detection, the generation of the motor control signals is performed by the software in the ASIC (user-specific IC) developed in-house. Since actual rated motor currents can be as high as 40 A, the design of the semiconductor output stages requires special attention as regards electromagnetic compatibility and cooling. This is where an early forecast of the pump’s thermal behavior is required, as well as the interdisciplinary expert knowledge that Pierburg Pump