IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0179156
(2002-06-25)
|
우선권정보 |
SE-0200566 (2002-02-26) |
발명자
/ 주소 |
- Korssell, Thomas
- Jacobson, Ulf
- Karlsson, Robert
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
10 |
초록
▼
The present invention relates to a method and an apparatus for controlling an electric motor by regulating at least the current Iout,the voltage Uoutand the frequency foutto an input of said motor, where the number of revolutions of said electric motor is proportional to said frequency fout. If an a
The present invention relates to a method and an apparatus for controlling an electric motor by regulating at least the current Iout,the voltage Uoutand the frequency foutto an input of said motor, where the number of revolutions of said electric motor is proportional to said frequency fout. If an available power Pinfrom an energy source is greater than or equal to the nominal requested power Pnomof said electric motor, the current Iout,voltage Uoutand frequency foutare set to there corresponding nominal values Inom,Unomand fnom,respectively, to achieve said requested power Pnomand frequency fnom. If said available power Pinis less than the requester power Pnom,the voltage Uoutand the frequency foutare reduced such that the relation between the voltage Uoutand the frequency foutis essentially constant while said current Ioutis kept at its nominal value Inom.
대표청구항
▼
The present invention relates to a method and an apparatus for controlling an electric motor by regulating at least the current Iout,the voltage Uoutand the frequency foutto an input of said motor, where the number of revolutions of said electric motor is proportional to said frequency fout. If an a
The present invention relates to a method and an apparatus for controlling an electric motor by regulating at least the current Iout,the voltage Uoutand the frequency foutto an input of said motor, where the number of revolutions of said electric motor is proportional to said frequency fout. If an available power Pinfrom an energy source is greater than or equal to the nominal requested power Pnomof said electric motor, the current Iout,voltage Uoutand frequency foutare set to there corresponding nominal values Inom,Unomand fnom,respectively, to achieve said requested power Pnomand frequency fnom. If said available power Pinis less than the requester power Pnom,the voltage Uoutand the frequency foutare reduced such that the relation between the voltage Uoutand the frequency foutis essentially constant while said current Ioutis kept at its nominal value Inom. each said secondary coil in each said bifilar winding has a diode connected thereto, thereby preventing the flow of current through each said secondary coil in said first direction. 5. The dual voltage motor drive of claim 1, further comprising a switched reluctance (SR) type motor. 6. A dual voltage motor drive, comprising: a rotor assembly rotatingly disposed within a stator assembly; a plurality of motor phase windings, said phase windings configured to be energized in a determined sequence to cause a rotation of said rotor assembly; said plurality of motor phase windings being divided into a first group or windings selectively energized by a first voltage source, and a second group of windings selectively energized by a second voltage source; said first group of windings being cross coupled to said second voltage source; and said second group of windings being cross coupled to said first voltage source; wherein the motor remains operational in the event of a failure of one of said first and second voltage sources. 7. The dual voltage motor drive of claim 6, further comprising: a first capacitor connected in parallel with said first voltage source and a second capacitor connected in parallel with said second voltage source; wherein said second capacitor is charged by current flowing through said first group of windings; and said first capacitor is charged by current flowing through said second group of windings. 8. The dual voltage motor drive of claim 7, wherein: said first group of windings includes at least one bifilar winding; and said second group of windings includes at least one bifilar winding; wherein each said bifilar winding includes a primary coil and a secondary coil, said secondary coil being magnetically coupled to said primary coil. 9. The dual voltage motor drive of claim 8, wherein: said primary coil in each said bifilar winding is energized by applying a phase control signal to a gate of a transistor connected to said primary coil, thereby causing an input current to flow through said primary coil in a first direction; and responsive to the removal of said phase control signal, said secondary coil in each said bifilar winding has an output current flowing there through in a second direction opposite to said first direction. 10. The dual voltage motor drive of claim 9, wherein: each said secondary coil in each said bifilar winding has a diode connected thereto, thereby preventing the flow of current through each said secondary coil in said first direction. 11. The dual voltage motor drive of claim 10, wherein said first and second capacitors are charged by said output current flowing in said secondary coils of said bifilar windings. 12. The dual voltage motor drive of claim 7, wherein: the supply voltage of said second voltage source is larger than the supply voltage of said first voltage source. 13. The dual voltage motor drive of claim 12, wherein: said second group of windings includes at least one bifilar winding, and each said at least one bifilar winding includes a primary coil and a secondary coil, said secondary coil being magnetically coupled to said primary coil. 14. The dual voltage motor drive of claim 13, wherein: said primary coil in each said at least one bifilar winding is energized by applying a phase control signal to a gate of a transistor connected to said primary coil, thereby causing an input current to flow through said primary coil in a first direction; and responsive to the removal of said phase control signal, said secondary coil in each said at least one bifilar winding has an output current flowing there through in a second direction opposite to said first direction. 15. The dual voltage motor drive of claim 14, wherein said first capacitor is charged by said output current flowing in said secondary coil of each said at least one bifilar winding. 16. The dual voltage motor drive of claim 7, wherein: said second group of win
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