Development of an Electric Driven Pump Unit for Electro-Hydraulic Power Steering of 42V Automobile

A lot of conventional automotive components driven by mechanical power source are being replaced with electrical ones to comply with the demands of market and customer, therefore the amount of electric energy used in a vehicle will be increased continuously. The increment of electric power demand causes interest on new higher power system such as 42V Power Net, and furthermore necessity for development of energy storage device is highlighted recently. The electro- hydraulic power steering (EHPS) system is one of them. This paper presents the development of the electric driven pump unit for EHPS system of 42V automobile, which is to install interior type permanent magnet synchronous motor.