Wear-balanced electromagnetic motor control switching
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01H-047/22
H01H-047/32
H01H-050/00
H01H-009/56
H02P-001/32
H01H-050/86
H02P-025/18
출원번호
US-0832885
(2015-08-21)
등록번호
US-10141143
(2018-11-27)
발명자
/ 주소
Bock, Christopher H.
Wieloch, Christopher J.
Kinsella, James J.
Dziekonski, Stefan T.
Miller, James P.
출원인 / 주소
Rockwell Automation Technologies, Inc.
대리인 / 주소
Fletcher Yoder, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
62
초록▼
One embodiment describes a method that includes in a first switching operation of an electrical power switching system including three separately controllable single pole, single current-carrying path switching devices that provide three-phase power to a load, and control circuitry coupled to the sw
One embodiment describes a method that includes in a first switching operation of an electrical power switching system including three separately controllable single pole, single current-carrying path switching devices that provide three-phase power to a load, and control circuitry coupled to the switching devices to control closing and opening of the current-carrying paths, commanding at least one of the switching devices to open or close in advance of at least one other of the switching devices based upon a current zero-crossing or a predicted current zero-crossing of input three-phase power; and in subsequent switching operations alternating which of the three switching devices is closed or opened in advance of another of the switching devices.
대표청구항▼
1. A method comprising: in a first switching operation of an electrical power switching system comprising three separately controllable single pole, single current-carrying path switching devices configured to provide three-phase power to a load, and control circuitry coupled to the switching device
1. A method comprising: in a first switching operation of an electrical power switching system comprising three separately controllable single pole, single current-carrying path switching devices configured to provide three-phase power to a load, and control circuitry coupled to the switching devices to control closing and opening of the current-carrying paths, commanding at least one of the switching devices to open or close in advance of at least one other of the switching devices based upon a current zero-crossing or a predicted current zero-crossing of input three-phase power; andin subsequent switching operations alternating which of the three switching devices is closed or opened in advance of another of the switching devices. 2. The method of claim 1, comprising determining the predicted current zero-crossing of at least one phase of the input three-phase power, and closing one of the switching devices at or within a desired time before the predicted current zero-crossing, and closing the remaining switching devices thereafter. 3. The method of claim 1, wherein the switching device that is closed in advance of the at least one other switching device is changed every subsequent switching operation. 4. The method of claim 1, comprising monitoring operation of the switching devices and alternating which of the three switching devices is closed or opened in advance of another of the switching devices based upon the monitored operation. 5. The method of claim 4, wherein which of the three switching devices is closed or opened in advance of the other switching devices is selected based upon a wear indication of the switching devices. 6. The method of claim 5, wherein selection of which of the three switching devices is closed or opened in advance of the other switching devices is based upon providing generally equal wear to all of the switching devices. 7. The method of claim 1, wherein the switching devices are substantially identical. 8. An electrical power switching system, comprising: a first switching device configured to selectively connect or disconnect phase A of three-phase electric power from a power source to a load;a second switching device configured to selectively connect or disconnect phase B of the three-phase electric power from the power source to the load; anda third switching device configured to selectively connect or disconnect phase C of the three-phase electric power from the source to the load; andcontrol circuitry configured to control operation of the first switching device, the second switching device, and the third switching device by:instructing the first switching device to open or close before the second switching device and the third switching device during a first switching operation;instructing the second switching device to open or close before the first switching device and the third switching device during a second switching operation; andinstructing the third switching device to open or close before the first switching device and the second switching device during a third switching operation. 9. The electrical switching system of claim 8, wherein the control circuit is configured to: instruct the first switching device to open based at least in part on when current conducted by the first switching device is zero; andinstruct the first switching device to close based at least in part on when voltage supplied to the first switching device from the power supply is zero. 10. The electrical switching system of claim 8, the control circuitry is configured to instruct the electrical switching system to rotate between performing the first switching operation, the second switching operation, and the third switching operating. 11. The electrical switching system of claim 8, wherein the first switching device, the second switching device, and the third switching device each comprises a single pole, single current-carrying path switching device. 12. The electrical switching system of claim 8, wherein the control circuitry is configured to: instruct the second switching device and the third switching device to open or close at substantially the same time during the first switching operation;instruct the first switching device and the third switching device to open or close at substantially the same time during the second switching operation; andinstruct the first switching device and the second switching device to open or close at substantially the same time during the third switching operation. 13. A tangible, non-transitory computer-readable medium configured to store instructions executable by a processor, wherein the instructions comprise instructions to: instruct, using the processor, an electrical power switching system to perform a first switching operation by:opening or closing a first single pole, single current-carrying path switching device; andsubsequently opening or closing a second single pole, single current-carrying path switching device; andinstruct, using the processor, the electrical power switching system to perform a second switching operation by:opening or closing the second single pole, single current-carrying path switching device; andsubsequently opening or closing the first single pole, single current-carrying path switching device. 14. The computer-readable medium of claim 13, wherein: the instructions to instruct the electrical power switching system to perform the first switching operation comprises instructions to open or close a third single pole, single-current carrying path switching device:substantially simultaneously with the second single pole, single current-carrying path switching device;substantially simultaneously with the first single pole, single current-carrying path switching device; orafter opening or closing the second single pole, single current-carrying path switching device. 15. The computer-readable medium of claim 13, comprising instruction to instruct, using the processor, the electrical power switching system to perform a third switching operation by: opening a third single pole, single current-carrying path switching device; andsubsequently opening the first single pole, single current-carrying path switching device and the second single pole, single current-carrying path switching device. 16. The computer-readable medium of claim 13, comprising instructions to determine, using the processor, whether to perform the first switching operation or the second switching operation based at least in part on a wear indication of the first single pole, single current-carrying path switching device and a wear indication of the second single-pole, single current-carrying path switching device. 17. The computer-readable medium of claim 13, comprising instructions to determine, using the processor, whether to perform the first switching operation or the second switching operation is based at least in part on providing generally equal wear to the first single pole, single current carrying path switching device and the second single pole, single current carrying path switching device. 18. The computer-readable medium of claim 13, wherein the instructions to perform the first switching operation comprise instructions to: open the first single pole, single current-carrying path switching device based at least in part on a first current zero-crossing; andopen the second single pole, single current-carrying path switching device based at least in part on a second current zero-crossing. 19. The computer-readable medium of claim 18, wherein: the first current zero-crossing is when current conducted by the first single pole, single current-carrying path switching device is zero; andthe second current zero-crossing is when current conducted by the second single pole, single current-carrying path switching device is zero. 20. A wye-delta switching system, comprising: one or more wye switching devices configured to connect and disconnect windings in a three-phase electric motor in a wye configuration;one or more delta switching devices configured to connect and disconnect the windings in the three-phase motor in a delta configuration; andcontrol circuitry configured to:control operation of the one or more wye switching devices such that the one or more wye switching devices connect or disconnect the windings in the wye configuration in varying order; andcontrol operation of the one or more delta switching devices such that the one or more delta switching devices connect or disconnect the winding in the delta configuration in varying order. 21. The wye-delta switching system of claim 20, wherein: the one or more wye switching devices comprises three single pole, single current carrying path switching devices; andthe one or more delta switching devices comprises three single pole, single current carrying path switching devices. 22. The wye-delta switching system of claim 20, wherein the control circuitry is configured to: instruct one of the one or more wye switching devices to open or close at a first time; andinstruct two different of the one or more wye switching devices to open or close substantially simultaneously at a second time;wherein the one or more wye switching devices comprises a first single pole switching device, a second single pole switching device, and a third single pole switching devices, wherein the one of the one or more wye switching devices rotates between the first single pole switching device, the second single pole switching device, and the third single pole switching device in different switching operations. 23. The wye-delta switching system of claim 20, wherein the control circuitry is configured to: instruct one of the one or more delta switching devices to open or close at a first time; andinstruct two different of the one or more delta switching devices to open or close substantially simultaneously at a second time;wherein the one or more delta switching devices comprises a first single pole switching device, a second single pole switching device, and a third single pole switching devices, wherein the one of the one or more delta switching devices rotates between the first single pole switching device, the second single pole switching device, and the third single pole switching device in different switching operations. 24. The wye-delta switching system of claim 20, wherein the control circuitry is configured to: determine order with which to connect or disconnect the windings in the wye configuration based at least in part on wear of each of the one or more wye switching devices; anddetermine order with which to connect or disconnect the windings in the delta configuration based at least in part on wear of each of the one or more delta switching devices. 25. The wye-delta switching system of claim 20, wherein the control circuitry is configured to control operation of the one or more wye switching devices such that the one or more wye switching devices: disconnect the windings from the wye configuration based at least in part on current zero-crossings in electric power carried by the one or more wye switching devices; andconnect the windings in the wye configuration based at least in part on voltage zero-crossings at a power source electrically coupled to the one or more wye switching devices. 26. The wye-delta switching system of claim 20, wherein the control circuitry is configured to control operation of the one or more delta switching devices such that the one or more delta switching devices: disconnect the windings from the wye configuration based at least in part on current zero-crossings in electric power carried by the one or more delta switching devices; andconnect the windings in the wye configuration based at least in part on voltage zero-crossings at a power source electrically coupled to the one or more delta switching devices.
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