MOTOR CONTROL SYSTEM

• US 20140253011A1
• Filed: 05/22/2014
• Published: 09/11/2014
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: Sky Climber LLC
• Original Assignee: Sky Climber LLC
• Inventors: Bonanno, James, Eddy, Robert E.
• Granted Patent: US 9,647,596 B2
• Time in Patent Office: Days
• US Class Current: 318/767
• CPC Class Codes: B66D 1/46 electric
• CPC Class Codes: B66D 1/605 scaffolding winshes B66D1/74 takes precedence
• CPC Class Codes: B66D 1/7489 having a particular use, e.g. rope ascenders
• CPC Class Codes: E04G 3/32 Hoisting devices; Safety devices
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence

Abstract

A motor control system powered by an input power source. The system includes a reactive power reducing input power system in electrical communication with a motor and a constant frequency input power source. The reactive power reducing input power system includes an AC-DC converter and a regulator system, wherein the regulator system is in electrical communication with a DC-AC inverter that is in electrical communication with the motor. The system may include an isolation system to electrically isolate the DC-AC inverter from the motor when the DC-AC inverter is not transmitting power to the motor. The system may accept multiple alternating current voltage sources including both single phase and three phase sources.

Claims

1. A motor control system for controlling the operation of a motor (210), the motor control system powered by a constant frequency input power source (800) via a conductor system (810), comprising:

a reactive power reducing input power system (1300) in electrical communication with the motor (210) and the constant frequency input power source (800), via the conductor system (810);

wherein the reactive power reducing input power system (1300) includes an AC-DC converter (640) and a regulator system (650), wherein the regulator system (650) is in electrical communication with a DC-AC inverter (670) in electrical communication with the motor (210); and

wherein the reactive power reducing input power system (1300) accepts at least two different alternating current voltage power inputs including a first alternating current voltage and a second alternating current voltage, and the regulator system (650) produces a single direct current voltage from either the first alternating current voltage or the second alternating current voltage, and transmits the direct current voltage to the DC-AC inverter (670).

2. The motor control system of claim 1, further including an isolation system (680) to electrically isolate the DC-AC inverter (270) from the motor (210) when the DC-AC inverter (270) is not transmitting power to the motor (210).

3. The motor control system of claim 1, wherein the first alternating current voltage is at least 50% greater than the second alternating current voltage.

4. The motor control system of claim 1, wherein the first alternating current voltage is at least twice the second alternating current voltage.

5. The motor control system of claim 1, wherein the first alternating current voltage is a three phase voltage and the second alternating current voltage is a single phase voltage.

6. The motor control system of claim 5, further including a multiple input power connection system (1400) including at least one single phase power connector (1410) and at least one three phase power connector (1420).

7. The motor control system of claim 1, wherein the regulator system (650) includes a buck regulator topology generating the direct current voltage supplied to the DC-AC inverter (670).

8. The motor control system of claim 7, wherein the buck regulator topology includes a toroidal stack having an inductance of at least 2 millihenry.

9. The motor control system of claim 1, wherein the reactive power reducing input power system (1300) accepts a single phase voltage, and the regulator system (650) includes a boost regulator topology generating the direct current voltage supplied to the DC-AC inverter (670), wherein the boost regulator has an inductance of at least 3 millihenry.

10. A motor control system for controlling the operation of a motor (210), the motor control system powered by a constant frequency input power source (800) via a conductor system (810), comprising:

a reactive power reducing input power system (1300) in electrical communication with the motor (210) and the constant frequency input power source (800), via the conductor system (810), wherein the reactive power reducing input power system (1300) includes an AC-DC converter (640) and a regulator system (650), wherein the regulator system (650) is in electrical communication with a DC-AC inverter (670) in electrical communication with the motor (210); and

an isolation system (680) to electrically isolate the DC-AC inverter (270) from the motor (210) when the DC-AC inverter (270) is not transmitting power to the motor (210).

11. The motor control system of claim 10, wherein the reactive power reducing input power system (1300) accepts a first alternating current voltage and a second alternating current voltage, and the regulator system (650) produces a single direct current voltage from either the first alternating current voltage or the second alternating current voltage, and transmits the direct current voltage to the DC-AC inverter (670).

12. The motor control system of claim 11, wherein the first alternating current voltage is at least 50% greater than the second alternating current voltage.

13. The motor control system of claim 11, wherein the first alternating current voltage is at least twice the second alternating current voltage.

14. The motor control system of claim 11, wherein the first alternating current voltage is a three phase voltage and the second alternating current voltage is a single phase voltage.

15. The motor control system of claim 14, further including a multiple input power connection system (1400) including at least one single phase power connector (1410) and at least one three phase power connector (1420).

16. The motor control system of claim 10, wherein the regulator system (650) includes a buck regulator topology generating the direct current voltage supplied to the DC-AC inverter (670).

17. The motor control system of claim 16, wherein the buck regulator topology includes a toroidal stack having an inductance of at least 2 millihenry.

18. The motor control system of claim 10, wherein the reactive power reducing input power system (1300) accepts a single phase voltage, and the regulator system (650) includes a boost regulator topology generating the direct current voltage supplied to the DC-AC inverter (670), wherein the boost regulator has an inductance of at least 3 millihenry.

19. The motor control system of claim 10, further including a descent control system (690) between the isolation system (680) and the motor (210), wherein in an emergency descent mode of the descent control system (690) electromagnetically controls the motor (210) to limit a maximum emergency descent velocity to 60 feet per minute.

20. The motor control system of claim 19, wherein the descent control system (690) creates a descent circuit connected to two terminals of the motor (210) and contains at least one descent capacitor thereby allowing the motor (210) to function as a generator creating a descent voltage of 100 VAC to 400 VAC across the at least one descent capacitor wherein the at least one descent capacitor has a capacitance in μ

F of at least 2.5 times the maximum desired descent velocity in feet per minute.