A gerotor pump comprising: an inlet for receiving fluid from a source; an outlet for delivering pressurized fluid to a mechanical system therefrom; an outer gear mounted relative to a first axis ; an inner gear mounted on a second axis for rotation, the outer gear meshing internally with the inner gear in an offset manner; a drive shaft coupled to the inner gear, the drive shaft being configured to be driven by a driver, to mechanically drive the inner gear about the second axis in order to pressurize the received fluid for output as the pressurized fluid; an electrical motor including a rotor and a stator having a radial gap therebetween in a radial direction, the rotor being disposed on an outer surface of the outer gear, and the electrical motor configured to electromagnetically drive the outer gear to rotate and thus further rotate the inner gear about the second axis in an eccentric manner, characterized by : a spindle fixedly coupled to the outer gear to facilitate substantially maintaining the radial gap between the rotor and the stator in the radial direction, and configured for rotation about the first axis; a bearing support ; and a bearing accommodated by the bearing support , the spindle having a spindle shaft axially received in the bearing to rotationally mount the spindle and fix or substantially fix a radial position of the rotor to substantially maintain the radial gap . an inlet for receiving fluid from a source; an outlet for delivering pressurized fluid to a mechanical system therefrom; an outer gear mounted relative to a first axis ; an inner gear mounted on a second axis for rotation, the outer gear meshing internally with the inner gear in an offset manner; a drive shaft coupled to the inner gear, the drive shaft being configured to be driven by a driver, to mechanically drive the inner gear about the second axis in order to pressurize the received fluid for output as the pressurized fluid; an electrical motor including a rotor and a stator having a radial gap therebetween in a radial direction, the rotor being disposed on an outer surface of the outer gear, and the electrical motor configured to electromagnetically drive the outer gear to rotate and thus further rotate the inner gear about the second axis in an eccentric manner, characterized by : a spindle fixedly coupled to the outer gear to facilitate substantially maintaining the radial gap between the rotor and the stator in the radial direction, and configured for rotation about the first axis; a bearing support ; and a bearing accommodated by the bearing support , the spindle having a spindle shaft axially received in the bearing to rotationally mount the spindle and fix or substantially fix a radial position of the rotor to substantially maintain the radial gap . a spindle fixedly coupled to the outer gear to facilitate substantially maintaining the radial gap between the rotor and the stator in the radial direction, and configured for rotation about the first axis; a bearing support ; and a bearing accommodated by the bearing support , the spindle having a spindle shaft axially received in the bearing to rotationally mount the spindle and fix or substantially fix a radial position of the rotor to substantially maintain the radial gap . <EOS>