Patent ID: 8287254
Filing Date: 2012-10-16
Classification: F04C

Abstract:
1. A motor and pump assembly comprising: a permanent magnet motor having a motor stator defining a plurality of pole pieces, a motor rotor and an output shaft coupled to the motor rotor; a positive displacement rotary pump having a pump rotor, an inlet port, an outlet in bi-directional fluid communication with the pump rotor, and a drive shaft driven by the output shaft, wherein the rotary pump is preselected so that the pump rotor has a predetermined rotational resistance; a transmission driven pump having an inlet and an outlet, the transmission driven pump disposed in parallel with the positive displacement rotary pump, wherein the transmission driven pump is driven by a transmission of a vehicle; and a feed line disposed between the outlet of the transmission driven pump and the pump rotor of the rotary pump, wherein the feed line is preconfigured to directly provide a maximum pressure from the outlet of the transmission driven pump to the pump rotor of the rotary pump, and wherein the maximum pressure provided to the pump rotor of the rotary pump is less than a pressure required to rotate the pump rotor of the rotary pump against the predetermined rotational resistance.