LOAD LOWERING REGENERATIVE ENERGY SYSTEM WITH CAPACITOR CHARGE AND DISCHARGE CIRCUIT AND METHOD OF OPERATING THE SAME

• US 20090091301A1
• Filed: 10/08/2007
• Published: 04/09/2009
• Est. Priority Date: 10/08/2007
• Status: Abandoned Application

• Current Assignee: Sauer-Danfoss Incorporated (Danfoss A/S)
• Original Assignee: Sauer-Danfoss Incorporated (Danfoss A/S)
• Inventors: Herrin, Jeff, Gandrud, Michael D.
• Application Number:
  US11/868,782
• Publication Number:
  US 20090091301A1
• Time in Patent Office: Days
• US Class Current: 320/166
• CPC Class Codes: B66F 9/07572 Propulsion arrangements
• CPC Class Codes: B66F 9/24 Electrical devices or systems
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02J 9/061 for DC powered loads

Abstract

An operating system for an electric motor associated with a hydraulic pump for moving a load and method of operating the same. The operating system includes a power source that is electrically connected to the electric motor wherein a capacitor charge and discharge circuit is used in association with a capacitor in order to store energy within the capacitor as the operating system is in use.

Claims

1. A method of operating an electric motor associated with a hydraulic pump for moving a load comprising:

providing a power source electrically connected to the electric motor;

providing a capacitor charge and discharge circuit electrically connected to the power source;

providing a capacitor electrically connected to the capacitor charge and discharge circuit for storing energy therein;

drawing current from the capacitor at a varying voltage as the capacitor is discharged with the capacitor charge and discharge circuit.

2. The method of claim 1 further comprising the step of providing a system control circuit electrically connected to the power source.

3. The method of claim 2 further comprising the step of providing a motor control circuit electrically connected to the electric motor.

4. The method of claim 3 wherein the motor control circuit is an inverter.

5. The method of claim 1 wherein the power source is a direct current power source.

6. The method of claim 1 further comprising the step of introducing current into the capacitor at a varying voltage as the capacitor is charged with the capacitor charge and discharge circuit.