Pump assembly having integrated controller and motor with internal active cooling

A method for cooling a pump assembly, the pump assembly comprising:

• an assembly inlet for inputting fluid, an assembly outlet for outputting fluid, an electric motor contained within a motor casing, a pump having a pump housing, the pump having an inlet for receiving input fluid from the assembly inlet and a transfer outlet for outputting pressurized fluid, a drive shaft connecting the electric motor to the pump, the drive shaft being configured to be driven about an axis by the electric motor, a controller configured to drive the electric motor, wherein the pump and the electric motor are on opposing axial sides of the controller, a heat conductive plate positioned between the pump and the controller, the heat conductive plate conducting heat from the controller, a transfer passage for receiving the pressurized fluid output from the transfer outlet of the pump and directing the pressurized fluid along and in contact with the heat conductive plate to conduct heat therefrom into the pressurized fluid, and an outlet passage communicating the transfer path with the assembly outlet to discharge the pressurized fluid;
• the method comprising:
• driving the electric motor using the controller;
• driving the drive shaft;
• inputting fluid through the assembly inlet of the pump assembly and into the inlet of the pump;
• pressurizing input fluid using the pump;
• outputting pressurized fluid via the transfer outlet into the transfer passage;
• directing the pressurized fluid along and in contact with the heat conductive plate;
• and
• discharging the pressurized fluid through the assembly outlet.