MEMS based motor starter with motor failure detection

• US 7,589,942 B2
• Filed: 06/15/2007
• Issued: 09/15/2009
• Est. Priority Date: 06/15/2007
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: General Electric Company
• Inventors: Cagglano, Robert Joseph, Premerlani, William James, Subramanian, Kanakasabapathi, Lesslie, David James, Kumfer, Brent Charles
• Primary Examiner(s): Ro; Bentsu
• Assistant Examiner(s): GLASS, ERICK DAVID
• Application Number:
  US11/763,646
• Publication Number:
  US 20080310057A1
• Time in Patent Office: 823 Days
• Field of Search: 361/31, 361/2, 318/474
• US Class Current: 361/31
• CPC Class Codes: H01H 2071/008 Protective switches or relays using micromechanics
• CPC Class Codes: H01H 59/0009 making use of micromechanics
• CPC Class Codes: H01H 9/541 Contacts shunted by semiconductor devices
• CPC Class Codes: H02H 7/0855 avoiding response to transient overloads, e.g. during starting
• CPC Class Codes: H02P 1/16 for starting dynamo-electric motors or dynamo-electric converters
• CPC Class Codes: H02P 29/02 Providing protection against overload without automatic interruption of supply protection against faults of stepper motors H02P8/36

Abstract

A motor starter is disclosed. The motor starter includes control circuitry integrally arranged with at least one current path and a processor included in the control circuitry. The motor starter further includes at least one processor algorithm residing on the processor, the at least one processor algorithm containing instructions to monitor characteristics of current on the at least one current path and to provide data pertaining to a condition of the at least one current path. The motor starter further includes a micro electromechanical system (MEMS) switch disposed on the at least one current path, the MEMS switch responsive to the control circuitry to facilitate the control of an electrical current, passing through the at least one current path.

Claims

1. A motor starter comprising:

control circuitry integrally arranged with at least one current path;

a processor included in the control circuitry;

a micro electromechanical system (MEMS) switch disposed in the at least one current path, the MEMS switch responsive to the control circuitry to facilitate control of an electrical current passing through the at least one current path; and

a soft-switching circuit to synchronize a change in state of the MEMS switch with an occurrence of a zero crossing of at least one of an alternating electrical current passing through the at least one current path and an alternating voltage of the at least one current path relative to an absolute zero reference.

2. The motor starter of claim 1, further comprising:

at least one processor algorithm residing at the processor, the at least one processor algorithm containing instructions readable and executable by the processor to monitor characteristics of the electrical current in the at least one current path, and to provide data pertaining to an operational condition associated with the at least one current path.

3. The motor starter of claim 2, wherein the control circuitry further includes a memory device configured for storing the data pertaining to the condition of the at least one current path.

4. The motor starter of claim 3, wherein the memory device includes a plurality of information pertaining to empirical current conditions indicating a fault condition of a motor on the at least one current path.

5. The motor starter of claim 3, wherein the memory device includes a plurality of processor algorithms containing instructions readable and executable by the processor to determine a plurality of different fault conditions of a motor on the at least one current path.

6. The motor starter of claim 5, wherein the processor processes the plurality of processor algorithms to provide data pertaining to the plurality of different fault conditions.

7. The motor starter of claim 2, wherein the characteristics of the electrical current include at least one of phase loss, phase imbalance, current level increase, exponential current level increase, and current level decrease.

8. The motor starter of claim 2, wherein:

the at least one current path is one of a plurality of current paths;

each current path of the plurality of current paths is integrally arranged with the control circuitry; and

the at least one processor algorithm contains instructions to monitor characteristics of each current in each of the plurality of current paths.

9. The motor starter of claim 8, wherein:

the MEMS switch is one of a plurality of MEMS switches corresponding to a respective one of the plurality of current paths; and

each MEMS switch of the plurality of MEMS switches is responsive to the control circuitry to facilitate the control of an electrical current passing through a respective one of the plurality of current paths.

10. The motor starter of claim 2, wherein the condition of the at least one current path includes at least one of motor stall, motor jam, short circuit, winding failure, bearing wear-out, and current leakage of a motor on the at least one current path.

11. The motor starter of claim 2, further comprising an indicator in signal communication with the control circuitry configured to indicate the condition of the at least one current path.

12. The motor starter of claim 11, wherein the indicator is a communication channel configured to communicate the condition of the at least one current path.

13. The motor starter of claim 11, wherein the indicator is an indicator lamp disposed for visual indication of the condition of the at least one current path.

14. The motor starter of claim 1, further comprising a Hybrid Arcless Limiting Technology (HALT) arc suppression circuit disposed in electrical communication with the MEMS switch to receive a transfer of electrical energy from the MEMS switch in response to the MEMS switch changing state from closed to open.

15. The motor starter of claim 1, further comprising a voltage snubber circuit in parallel connection with the MEMS switch.

16. An early warning motor protection method, comprising:

receiving information at a processor pertaining to an electrical current in a current path integrally arranged with control circuitry, the control circuitry including the processor and configured to control the electrical current with a micro electromechanical system (MEMS) switch responsive to the control circuitry;

storing historical performance data based on the received information at a memory operatively connected to the processor;

calculating an operational condition of the current path at the processor based on the stored historical performance data; and

indicating the operational condition of the current path to provide early warning motor protection.

17. The method of claim 16, wherein:

the current path supplies the electrical current to an electrical motor operatively connected to the MEMS switch.

18. The method of claim 16, wherein the indicating includes one of visually indicating the operational condition and electronically indicating the operational condition.