Motor modeling using harmonic ampere-turn saturation method
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-001/24
출원번호
US-0877877
(2001-06-08)
발명자
/ 주소
Saban, Daniel M.
Jansen, Patrick L.
Stevens, Charles M.
출원인 / 주소
General Electric Company
대리인 / 주소
Welsh & Katz, Ltd.
인용정보
피인용 횟수 :
23인용 특허 :
1
초록▼
A method and apparatus are provided for modeling an electric motor. The method includes the steps of interpolating a flux density for each angular position within an air gap of the electric motor from a predetermined air gap and tooth magnetization magnetomotive force versus air gap flux density cur
A method and apparatus are provided for modeling an electric motor. The method includes the steps of interpolating a flux density for each angular position within an air gap of the electric motor from a predetermined air gap and tooth magnetization magnetomotive force versus air gap flux density curve, decomposing the interpolated flux density into a set of harmonic components using a fast Fourier transform and determining a flux density error function from the decomposed set of harmonic components.
대표청구항▼
A method and apparatus are provided for modeling an electric motor. The method includes the steps of interpolating a flux density for each angular position within an air gap of the electric motor from a predetermined air gap and tooth magnetization magnetomotive force versus air gap flux density cur
A method and apparatus are provided for modeling an electric motor. The method includes the steps of interpolating a flux density for each angular position within an air gap of the electric motor from a predetermined air gap and tooth magnetization magnetomotive force versus air gap flux density curve, decomposing the interpolated flux density into a set of harmonic components using a fast Fourier transform and determining a flux density error function from the decomposed set of harmonic components. according to claim 1, wherein an additional transparent body is disposed along the optical axis in a second end of the bulb. 4. The discharge lamp according to claim 1, wherein at least one of the transparent bodies forms a hermetically sealed junction in its marginal area with one of the ends of the bulb. 5. The discharge lamp according to claim 1, wherein the bulb is provided along the optical axis with an electrode in the area of each of its ends for the capacitive generation of the electromagnetic field, each of the electrodes containing an aperture in the area of the axis of the transparent body. 6. The discharge lamp according to claim 1, wherein an additional radiation source configured as a thermal radiator is arranged along the optical axis in the area of the second end outside of the lamp bulb, whose radiation enters the bulb through the transparent body, both the radiation produced by the plasma and the radiation of the thermal radiator being carried out through the first transparent body. 7. The discharge lamp according to claim 1, wherein at least one aperture of the diaphragms is of circular configuration and has a diameter of from 0.2 to 6 mm. 8. The discharge lamp according to claim 1, wherein said at least one diaphragm comprises a member selected from the group consisting of aluminum oxide, aluminum nitride, and boron nitride. 9. The discharge lamp according to claim 1, wherein at least one diaphragm comprises a member selected from the group consisting of thorium oxide, beryllium oxide and polycrystalline diamond. 10. The discharge lamp according to claim 1, wherein at least one diaphragm consists of high-melting metal. 11. The discharge lamp of claim 10, wherein the high-melting metal is selected from the group consisting of molybdenum and tungsten. 12. The discharge lamp according to claim 1, wherein the transparent body comprises a member selected from the group consisting of quartz glass, UV-transparent glass, and sapphire. 13. The discharge lamp according to claim 1, wherein the lamp bulb is filled with deuterium with a cold fill pressure of 1 to 100 mbar. 14. The discharge lamp according to claim 1, wherein the electrodes are connected to a high-frequency generator which produces an excitation frequency in the range from 0.1 KHz to 2450 MHZ. tage to a predetermine level to proceed with a start-up of the lamp upon receiving an initial operating signal from the undervoltage protector; a dimming controller for gradually increasing a voltage for dimming control even when an externally input dimming signal is changed in order to regulate the light intensity; a feedback section for forming a feedback voltage based on the magnitude of the current flowing through the lamp, comparing the feedback voltage with a reference voltage formed based on output signals from the soft starter and the dimming controller to perform the soft start and soft dimming operations of the lamp, and determining whether the current flowing through the lamp is an overcurrent, an undercurrent, or a normal current; a frequency controller for generating first and second frequencies for regulating the magnitude of the current input to the lamp based on a received signal from the feedback section, whereby the frequency controller generates the first frequency when the feedback voltage is greater than the reference voltage, the second frequency being generated when the feedback voltage is less than the reference voltage; and a switch driver coupled to the first and second frequencies to control the on/off state of the switch of the current controller. 2. The ballast as claimed in claim 1, wherein the ballast further comprises an overcurrent protector for stopping the operation of the switch driver upon detection of an overcurrent input to the lamp section, wherein the overcurrent is greater than a predetermined current level. 3. The ballast as claimed in claim 1, wherein the ballast further comprises a lamp selector for detecting the current at the lamp section, the current varying depending on the number of lamps, to change the magnitude of the reference voltage of the feedback section. 4. The ballast as claimed in claim 1, wherein the undervoltage protector comprises: an ignition and operating voltage section for forming an ignition voltage for starting the entire system using a current from the power supply upon receiving a start signal of the entire system, and then forming an operation maintenance voltage for maintaining the operation of the entire system using a current from the current controller; and an undervoltage detector for comparing a voltage received from the ignition and operating voltage section to an undervoltage reference voltage, whereby the undervoltage detector holds off the start-up of the entire system upon receiving a voltage of less than the ignition voltage. 5. The ballast as claimed in claim 1, wherein the undervoltage protector further comprises a first shutdown section coupled to an output signal of the undervoltage detector, whereby the first shutdown section prevents the formation of a start voltage of the soft starter upon receiving a voltage of less than the ignition voltage. 6. The ballast as claimed in claim 5, wherein the soft starter comprises: a first current supply for supplying an electric charge; a start voltage generator coupled to the output signal of the undervoltage detector to turn off the first shutdown section upon receiving the ignition voltage from the ignition and operating voltage section, and then coupled to the electric charge supplied from the first current supply, whereby the start voltage generator forms a gradually increasing start voltage; a start reference voltage generator coupled to the start voltage that is gradually increased to a predetermined voltage, whereby the start reference voltage generator forms a gradually increasing reference voltage to be input to the feedback section; and a start frequency generator coupled to the start voltage applied to the start voltage generator during the initial operation of the entire system, whereby the start frequency generator outputs a signal for forming a start frequency from the frequency controller during the initial operation of the entire system. 7. The ballast as claimed in
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이 특허에 인용된 특허 (1)
Landin Donald T. ; Johnson Gordon G. ; McCutcheon Jeffrey W. ; Hilderbrand Larry S., Internally damped stator, rotor, and transformer and a method of making.
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