# US 2018/0023565 A1 · Pump assembly having integrated controller and motor with internal active cooling

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- Number: US 2018/0023565 A1
- Document ID: US20180023565A1
- Status: Published application
- Kind: A1
- Application number: 15/653,690
- Filed: 2017-07-19
- Published: 2018-01-25
- Earliest claimed: 2016-07-20
- Assignees: Stackpole International Engineered Products, Ltd.
- Applicants: Stackpole International Engineered Products, Ltd.
- Inventors: Liping WANG; Richard Muizelaar
- Web page: https://patentgrep.com/patent/US20180023565A1

## CPC

- F04C 15/0096: {Heating; Cooling (of machines or engines in general F01P)}
- F04C 2/10: of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C 2/102: {the two members rotating simultaneously around their respective axes}
- F04C 11/008: {Enclosed motor pump units}
- F04C 15/06: Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C 29/047: {Cooling of electronic devices installed inside the pump housing, e.g. inverters}
- F04D 13/0686: {Mechanical details of the pump control unit (pump control F04D15/00)}
- F04D 29/5813: {Cooling the control unit}
- F04C 29/045: {of the electric motor in hermetic pumps}
- F04C 2210/206: Oil
- F04C 2240/30: Casings or housings
- F04C 2240/40: Electric motor
- F04C 2240/60: Shafts
- F04C 2240/808: Electronic circuits (e.g. inverters) installed inside the machine
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A pump assembly and a method for cooling the same are disclosed. The pump assembly includes a pump, a controller, and a driven electric motor. The pump and the electric motor are on opposing axial sides of the controller. The assembly also has a heat conductive plate positioned between the pump and the controller that conducts heat from the controller. A transfer passage is provided for receiving pressurized fluid output from the pump and to direct the fluid along and in contact with the heat conductive plate to conduct heat therefrom into the pressurized fluid. An outlet passage communicates with the assembly outlet to discharge the pressurized fluid.

## Claims

### Claim 1

A 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.

### Claim 2 (depends on 1)

The pump assembly according to claim 1, wherein the pump housing and the motor casing are connected to contain and house the controller.

### Claim 3 (depends on 1)

The pump assembly according to claim 1, wherein the controller is provided within the motor casing and wherein the heat conductive plate is a cover plate connected to the motor casing for containing the controller therein.

### Claim 4 (depends on 3)

The pump assembly according to claim 3, wherein the cover plate comprises a first axial side and a second axial side, the first axial side of the cover plate facing the pump housing and the second axial side of the cover plate facing the motor casing, wherein the controller contained by the second axial side of the cover plate, and wherein the first axial side of the cover plate comprises a transfer recess therein for defining the transfer passage.

### Claim 5 (depends on 4)

The pump assembly according to claim 4, wherein the pump housing is connected to the cover plate.

### Claim 6 (depends on 4)

The pump assembly according to claim 4, wherein pump housing includes a port plate that is positioned against the cover plate and the pump housing comprises the outlet passage radially adjacent and isolated from the pump chamber.

### Claim 7 (depends on 4)

The pump assembly according to claim 4, wherein the controller comprises a circuit board including a plurality of capacitors, wherein the drive shaft extends through the circuit board, and wherein the plurality of capacitors are arranged in a spaced configuration around the drive shaft.

### Claim 8 (depends on 7)

The pump assembly according to claim 7, wherein the second axial side of the cover plate comprises indentations therein to accommodate the plurality of capacitors.

### Claim 9

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.