Hybrid electro-hydraulic power device
AssigneeHarris Waste Management Group, Inc.
InventorEdwin K. Simpson
Life of this patent
Estimating the term…
Abstract
A hydraulic power device for effecting operation of at least one load, the hydraulic power device including a motor having a predetermined motor speed rating and motor power rating, at least one pump operably coupled to the motor, the pump being configured to provide, to the at least one load, a predetermined hydraulic fluid flow at the predetermined motor speed rating, and a variable frequency drive connected to the motor, the variable frequency drive being configured to effect operation of the motor at a speed above the predetermined motor speed rating such that the at least one pump operates to provide an excess hydraulic fluid flow during operation of the motor substantially above the predetermined motor speed rating where the excess fluid flow is greater than the predetermined hydraulic fluid flow.
Claims21
A hydraulic power device for effecting operation of at least one load, the hydraulic power device comprising:
- a motor having a predetermined motor speed rating and motor power rating;
- at least one pump operably coupled to the motor, the at least one pump being configured to provide, to the at least one load, a first hydraulic fluid flow at the predetermined motor speed rating and a second hydraulic fluid flow at the predetermined motor speed rating, the first hydraulic fluid low being different than the second hydraulic fluid flow;
- and
- a variable frequency drive connected to the motor, the variable frequency drive being configured to effect operation of the motor at a speed above the predetermined motor speed rating such that the at least one pump operates to provide an excess hydraulic fluid flow to the at least one load during operation of the motor substantially above the predetermined motor speed rating where the excess fluid flow is greater than at least one of the first hydraulic fluid flow and the second hydraulic fluid flow.
A hydraulic power device for effecting operation of at least one load, the hydraulic power device comprising:
- a motor having a predetermined motor speed rating and motor power rating;
- at least one pump operably coupled to the motor, the pump being configured to provide, to the at least one load, a predetermined hydraulic fluid flow at the predetermined motor speed rating;
- a pump control operably coupled to the at least one pump for varying the hydraulic fluid flow between a first hydraulic fluid flow at the predetermined motor speed rating and a second hydraulic fluid flow at the predetermined motor speed rating, the first hydraulic fluid flow being different than the second hydraulic fluid flow;
- and
- a variable frequency drive connected to the motor, the variable frequency drive being configured to effect operation of the motor at a speed above the motor speed rating such that the at least one pump operates to provide an excess hydraulic fluid flow to the at least one load during operation of the motor substantially above the speed rating, the excess hydraulic fluid flow being greater than at least one of the first hydraulic fluid flow and the second hydraulic fluid flow.
A method comprising:
- operating, with a variable frequency drive, a motor in a hydraulic power device at a speed above a speed rating of the motor;
- and
- operating, with the motor, at least one pump in the hydraulic pump system such that the at least one pump operates to provide
- a first hydraulic fluid flow and a second hydraulic fluid flow to at least one load, where the first hydraulic fluid flow is different than the second hydraulic fluid flow,
- and an excess hydraulic fluid flow to the at least one load during operation of the motor substantially above the speed rating, wherein the excess hydraulic fluid flow is greater than at least one of the first hydraulic fluid flow and the second hydraulic fluid flow, the first hydraulic fluid flow and the second hydraulic fluid flow being generated when the motor is operated at the speed rating of the motor.
Dependencies are inferred from the claim text.