Electronic control for a rotary fluid device

• US 10,100,827 B2
• Filed: 07/28/2008
• Issued: 10/16/2018
• Est. Priority Date: 07/28/2008
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Inventors: Devan, Stephen Marshall, Galloway, Phillip W., Williams, Kevin Stuart
• Primary Examiner(s): Comley, Alexander
• Application Number:
  US12/181,083
• Publication Number:
  US 20100021313A1
• Time in Patent Office: 3,732 Days
• Field of Search: 417 22, 417 32, 417 441- 45, 417 53, 417 4411, 417 42, 417459, 417 13, 417 18
• CPC Class Codes: F04B 1/328 by changing the inclination of the axis of the cylinder barrel relative to the swash plate
• CPC Class Codes: F04B 17/03 driven by electric motors
• CPC Class Codes: F04B 2203/0201 Current
• CPC Class Codes: F04B 2203/0202 Voltage
• CPC Class Codes: F04B 2203/0209 Rotational speed
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04B 49/103 Responsive to speed
• CPC Class Codes: F04B 49/106 Responsive to pumped volume
• CPC Class Codes: F04B 49/20 by changing the driving speed

Abstract

A fluid device system includes a fluid pump, an electric motor in engagement with the fluid pump, and a controller. The electric motor is adapted for rotation in response to an electric signal. The controller is adapted to communicate the electric signal to the electric motor. The controller includes a lookup table having a plurality of performance data related to the fluid pump and the electric motor. The performance data from the lookup table is used by the controller to set aspects of the electrical signal communicated to the electric motor in order to achieve a desired attribute of the fluid pump.

Claims

1. A fluid device system comprising:

a rotary fluid pump having a fluid inlet and a fluid outlet;

an electric motor having a shaft coupled to the rotary fluid pump, the electric motor being adapted for rotation in response to a control signal;

a plurality of sensors including at least a motor shaft speed sensor and a motor shaft position sensor;

a controller adapted to receive inputs from the plurality of sensors and to communicate the control signal to the electric motor, the controller including a lookup table having pump performance data accounting for changes in a relationship between at least one of phase current and shaft speed, and phase angle and torque due to performance losses of the rotary fluid pump;

wherein the inputs from the plurality of sensors and the pump performance data from the lookup table are used by the controller to determine an efficiency of the rotary fluid pump, wherein the controller uses the determined rotary fluid pump efficiency to modify the control signal to the motor to regulate an output parameter of the rotary fluid pump.

2. The fluid device of claim 1, wherein performance losses in the rotary fluid pump are due to leakage of the rotary fluid pump.

3. The fluid device of claim 2, wherein the control signal to the electric motor includes at least one of a voltage, a phase current, and a phase angle.

4. The fluid device of claim 3, wherein the pump performance data from the lookup table is used by the controller to achieve at least one output parameter of a generally constant fluid horsepower output and a pressure compensation of the rotary fluid pump.

5. The fluid device of claim 4, wherein the lookup table includes a first lookup table used by the controller to operate the rotary fluid pump in a generally constant fluid horsepower output mode and includes a second lookup table used by the controller to operate the rotary fluid pump in a pressure compensation output mode.

6. The fluid device of claim 5, further including a manual switch in communication with the controller for operating the rotary fluid pump between the generally constant fluid horsepower output mode and the pressure compensation output mode.

7. The fluid device of claim 5, wherein the controller is adapted to automatically switch between the generally constant fluid horsepower output mode and the pressure compensation output mode based on a sensed parameter.

8. The fluid device of claim 7, wherein the sensed parameter of the rotary fluid device is an input received from the motor shaft speed sensor.

9. The fluid device of claim 1, wherein the lookup table includes temperature variables to account for the changes in a relationship between at least one of phase current and shaft speed, and phase angle and torque due to fluctuations in flued temperature.