AU9292198A - A rotary electric machine - Google Patents
A rotary electric machine Download PDFInfo
- Publication number
- AU9292198A AU9292198A AU92921/98A AU9292198A AU9292198A AU 9292198 A AU9292198 A AU 9292198A AU 92921/98 A AU92921/98 A AU 92921/98A AU 9292198 A AU9292198 A AU 9292198A AU 9292198 A AU9292198 A AU 9292198A
- Authority
- AU
- Australia
- Prior art keywords
- machine
- layer
- conductor
- winding
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005284 excitation Effects 0.000 claims description 31
- 238000004804 winding Methods 0.000 claims description 25
- 239000004020 conductor Substances 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 206010001497 Agitation Diseases 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 241000863814 Thyris Species 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 36
- 239000000463 material Substances 0.000 description 10
- 230000001360 synchronised effect Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 101100508411 Caenorhabditis elegans ifb-1 gene Proteins 0.000 description 3
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229920001748 polybutylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 101100508412 Caenorhabditis elegans ifb-2 gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000011243 crosslinked material Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000013641 positive control Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/26—Synchronous generators characterised by the arrangement of exciting windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/36—Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/02—Details of the control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/15—Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Synchronous Machinery (AREA)
- Control Of Eletrric Generators (AREA)
Description
WO 99/17432 PCT/SE98/01741 A ROTARY ELECTRIC MACHINE Technical field The present invention relates to a rotary electric machine of alternating current 5 type designed to be connected directly to a distribution or transmission network and comprising at least one electric winding. The invention also relates to an electric power plant comprising such an electric machine, and also to a method of exciting a rotary electric machine. 10 Background art The rotary electric machine according to the invention may be a synchronous ma chine, dual-fed machine, external pole machine or synchronous flow machine. To connect machines of this type to distribution or transmission networks, in the 15 following referred to as power networks, transformers have hitherto been used to step up the voltage to network level, i.e. to the range of 130-400 kV. Generators having a rated voltage of up to 36 kV are described by Paul R. Siedler "36 kV Generators Arise from Insulation Research", Electrical World, 15 October 20 1932, pages 524-527. These generators comprise windings of high-voltage cable in which the insulation is divided into different layers with different dielectric con stants. The insulating material used consists of various combinations of the three components mica-foil mica, varnish and paper. 25 It has now been found that, by manufacturing the above-mentioned winding of the electric machine from an insulated electric high-voltage conductor with a solid in sulation of a type similar to that used in cables for power transmission, the ma chine voltage can be increased to such levels that the machine can be connected directly to any power network without the use of intermediate transformers. A 30 typical operating range for these machines is 30 to 800 kV. Nowadays static exciters or brushless exciters with rotating diode rectifier bridges are used in rotary electric machines. The excitation equipment is frequently re quired to be able to produce a peak voltage and peak current of 1.5 to 3 times 35 greater than equivalent magnitudes in the case of rated load excitation for the machine in question, for a duration of 10-30 seconds. The excitation equipment shall also be able to produce a field current equivalent to the rated load excitation current for 25% voltage on the stator terminal of the machine. The excitation system shall preferably be "maintenance free", i.e. an excitation system without WO 99/17432 2 PCT/SE98/01741 slip rings. The response and transient times at network disturbances shall also be rapid, i.e. the excitation equipment shall be able to generate both positive and negative field voltage. In the case of synchronous compensators, the excitation system shall generally be able to produce both positive and negative field current 5 and demands for peak voltage factors greater than 3 times the rated load excita tion voltage may occur. Brushless exciters eliminate the problems of dirt from carbon dust from brushes and slip rings. However, brushless exciters in accordance with known technology 10 exhibit poorer control performance than static exciters. The object of the present invention is thus to provide a rotary electric machine that can be connected directly to a power network and that is provided with a "maintenance free" excitation system with improved control performance, and an 15 electric power plant comprising such an electric machine, as well as to propose a method for excitation of a rotary electric machine. Description of the invention This object is achieved with a rotary electric machine of the type described in the 20 introduction, having the characterizing features of claim 1, an electric power plant in accordance with claim 17 and a method in accordance with claim 18. The insulating conductor or high-voltage cable used in the present invention is flexible and is of the type described in more detail in WO 97/45919 and 25 WO 97/45847. The insulated conductor or cable is described further in WO 97/45918, WO 97/45930 and WO 97/45931. Thus, in the device in accordance with the invention the windings are preferably of a type corresponding to cables having solid, extruded insulation, like those cur 30 rently used for power distribution, such as XLPE-cables or cables with EPR insulation. Such a cable comprises an inner conductor composed of one or more strands, an inner semi-conducting layer surrounding the conductor, a solid insulat ing layer surrounding this semiconducting layer and an outer semiconducting layer surrounding the insulating layer. Such cables are flexible, which is an important 35 property in this context since the technology for the device according to the inven tion is based primarily on winding systems in which the winding is formed from cables which are bent during assembly. The flexibility of a XLPE-cable normally corresponds to a radius of curvature of approximately 20 cm for a cable 30 mm in diameter, and a radius of curvature of approximately 65 cm for a cable 80 mm in WO 99/17432 3 PCT/SE98/01741 diameter. In the present application the term "flexible" is used to indicate that the winding is flexible down to a radius of curvature of the order of four times the ca ble diameter, preferably eight to twelve times the cable diameter. 5 The winding should be constructed to retain its properties even when it is bent and when it is subjected to thermal or mechanical stress during operation. It is vital that the layers retain their adhesion to each other in this context. The mate rial properties of the layers are decisive here, particularly their elasticity and rela tive coefficients of thermal expansion. In a XLPE-cable, for instance, the insulat 10 ing layer consists of cross-linked, low-density polyethylene, and the semiconduct ing layers consist of polyethylene with soot and metal particles mixed in. Changes in volume as a result of temperature fluctuations are completely absorbed as changes in the radius of the cable and, thanks to the comparatively slight differ ence between the coefficients of thermal expansion in the layers in relation to the 15 elasticity of these materials, the radial expansion can take place without the ad hesion between the layers being lost. The material combinations stated above should be considered only as examples. Other combinations fulfilling the conditions specified and also the condition of be 20 ing semiconducting, i.e. having a resistivity within the range of 10 -1 - 1 06 ohm-cm, e.g. 1-500 ohm-cm, or 10-200 ohm-cm, naturally also fall within the scope of the invention. The insulating layer may consist, for example, of a solid thermoplastic material 25 such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polybutylene (PB), polymethyl pentane (PMP), cross-linked materials such as cross-linked polyethylene (XLPE), or rubber such as ethylene propylene rubber (EPR) or silicon rubber. 30 The inner and outer semiconducting layers may be of the same basic material but with particles of conducting material such as soot or metal powder mixed in. The mechanical properties of these materials, particularly their coefficients of thermal expansion, are affected relatively little by whether soot or metal powder is 35 mixed in or not - at least in the proportions required to achieve the conductivity necessary according to the invention. The insulating layer and the semiconduct ing layers thus have substantially the same coefficients of thermal expansion.
WO 99/17432 4 PCT/SE98/01741 Ethylene-vinyl-acetate copolymers/nitrile rubber, butylymp polyethylene, ethylene acrylate-copolymers and ethylene-ethyl-acrylate copolymers may also constitute suitable polymers for the semiconducting layers. 5 Even when different types of material are used as base in the various layers, it is desirable that their coefficients of thermal expansion are of the same order of magnitude. This is the case with the combination of the materials listed above. The materials listed above have relatively good elasticity, with an E-modulus of 10 E<500 MPa, preferably <200 MPa. The elasticity is sufficient for any minor differ ences between the coefficients of thermal expansion for the materials in the lay ers to be absorbed in the radial direction of the elasticity so that no cracks or other damage appear and so that the layers are not released from each other. The ma terial in the layers is elastic, and the adhesion between the layers is at least of the 15 same magnitude as the weakest of the materials. The conductivity of the two semiconducting layers is sufficient to substantially equalize the potential along each layer. The conductivity of the outer semicon ducting layer is sufficiently large to contain the electrical field in the cable, but suf 20 ficiently small not to give rise to significant losses due to currents induced in the longitudinal direction of the layer. Thus, each of the two semiconducting layers essentially constitutes one equipo tential surface, and the winding with these layers will substantially enclose the 25 electrical field within it. There is, of course, nothing to prevent one or more additional semiconducting layers being arranged in the insulating layer. 30 By providing the electric machine in question with a brushless excitation system switchable between positive and negative excitation, a "maintenance free" system is obtained having rapid response and transient times at network disturbances, for instance, since the excitation system is able to generate both positive and nega tive field voltage and thus positive and negative field current. 35 According to an advantageous embodiment of the machine in accordance with the invention, the excitation system comprises two controllable antiparallel-connected current converter devices for feeding the field winding of the alternating current machine, a two-way field over-voltage protection means or discharge circuit con- WO 99/17432 5 PCT/SE98/01741 nected across the field winding, and also control equipment for controlling the cur rent converters and over-voltage protection means or discharge circuit. This is a simple construction requiring no galvanically separated supply sources and cur rent-limiting reactances and no separate short-circuiting devices for extinguishing 5 conducting thyristors. The excitation system is also well suited for synchronous machines such as synchronous compensators. The present invention thus ex ploits the ability offered by semiconductor technology to temporarily change the polarity in a simple manner, which facilitates rapid commutation of the field current from static current converter bridge to short-circuiting circuit and vice versa when 10 a change of current direction is required in the field circuit of the machine. Brief description of the drawings To explain the invention more clearly embodiments of the machine in accordance with the invention, selected by way of example, will now be described in more 15 detail with reference to the accompanying drawings, in which Figure 1 shows the insulated cable used in the machine in accordance with the invention, Figure 2 shows a circuit diagram of the excitation system in the machine in 20 accordance with the invention, and Figures 3a-f show the voltage and current variation upon bridge switching in the excitation system shown in Figure 2. Description of a preferred embodiment 25 Figure 1 shows a cross section through an insulated conductor 11 intended for use in the windings of the machine in accordance with the present invention. The insulated conductor 11 thus comprises a number of strands 35 having circular cross section and consisting of copper (Cu), for instance. These strands 35 are 30 arranged in the middle of the insulated conductor 11. A first semiconducting layer 13 is arranged around the strands 35. An insulating layer 37, e.g. XLPE insula tion, is arranged around the first semiconducting layer 13. A second semiconduct ing layer 15 is arranged around the insulating layer 37. The insulated conductor is flexible and retains this property throughout its service life. Said three layers are 35 constructed so that they adhere to each other even when the insulated conductor is bent. The insulated conductor has a diameter within the interval 20-250 mm and a conducting area within the interval 80-3000 mm 2
.
WO 99/17432 6 PCT/SE98/01741 Figure 2 shows a circuit diagram for the excitation system in the machine in ac cordance with the invention. The field winding 4 of the machine, which may be stationary or rotating, is connected to two antiparallel-connected current converter bridges 1, 2. A two-way over-voltage protection means comprising two antiparal 5 lel-connected thyristors 8, 10 with associated ignition circuits 12, 14, is also pro vided over the field winding 4. The current converter bridges 1, 2 are supplied from a source 16 and controlled from a switching logic 18 via control pulse amplifiers 20, 22. A control pulse gen 10 erator 28 for the current converter bridges 1, 2 in the form of thyristor bridges is also arranged to emit control pulses to the pulse amplifiers 20, 22. Measuring in struments 24, 26 are also arranged to measure the currents IFB1 and IFB2, re spectively, from the current converter bridges 1, 2, and transmit the measured re sults to the switching logic 18 for control purposes. Connection of the thyristors 8, 15 10 of the over-voltage protection means is also controlled from the switching logic 18 via the ignition circuits 12, 14. The over-voltage protection means is con nected to a current-limiting resistor R. In the system with field breakers this resis tor R serves as discharge resistor. 20 The procedure for switching from bridge 1 to bridge 2 is as follows: Initially bridge 1 is assumed to be conducting, which means that the current direction IF through the field winding 4 is positive, see Figures 3a and 3b. The control signal Ust, see Figure 2, to the control pulse generator 28 and the switching logic 18 will be nega tive, resulting in bias reduction and thus a change of polarity of the bridge 1, see 25 Figure 3a. The time interval for bias change, t2-t1 according to Figure 3b, from maximum positive peak voltage to maximum negative peak voltage is approxi mately 8.3 ms at a frequency of 50 Hz and 6-pulse two-way bridge. At the time t3, when the current IFB1 is still greater than 0, an ignition pulse is 30 transmitted to the discharge thyristor 10 and a blocking signal to the bridge 1. As a result of the free-wheel effect at negative bias, a momentary transmission of excitation current IFB1 to the over-voltage protection circuit is obtained, and the bridge 1 becomes currentless. A signal from the measuring instrument 24 that the bridge 1 is currentless initiates unblocking of bridge 2 and blocking of the ignition 35 circuit 14 for the thyristor 10. The time interval t4-t3 according to Figure 3, i.e. the period from the blocking of bridge 1 until the bridge 2 is connected is approxi mately 5 ms, see Figure 3. It is apparent from Figure 3d that the current IF in the field circuit 4 during this switching interval is maintained as a result of the induc tance of the field winding 4. As apparent from Figures 3d and 3e, the biased WO 99/17432 7 PCT/SE98/01741 bridge 2 now forces a current IR, see Figure 3f, through the thyristor 10 and the current-limiting resistor R, and also a current IF through the field winding 4 of the synchronous machine. At the time t5 the field current IF has changed polarity and the discharge thyristor 10 is extinguished through temporary biasing reduction of 5 the bridge 2, i.e. a temporary change in polarity to force a current in the reverse direction of the short-circuiting circuit or the over-voltage protection means. A suitable choice of current levels for generating blocking and detecting signals ensures that the time interval is brief for connecting the two-way field over-voltage 10 protection means 8, 10, 12, 14 serving as auxiliary circuit or the two-way thyristor discharge circuit. Switching from negative current direction to positive current direction at a positive control signal occurs in corresponding manner by temporary connection of the 15 thyristor 8 in the over-voltage protection means. An embodiment of the rotary electric machine in accordance with the invention is described above by way of example. However, several modifications are of course feasible within the scope of the invention. The principle described can 20 thus be used for both stationary and rotating thyristor bridges for exciting syn chronous machines or for supplying motors for drive systems. Temporary or pulsed biasing reduction may also be used to reset an activated over-voltage protection means. In a first phase, an over-voltage signal then gives a signal for alarm and resetting the protection means. A continuous error signal after a num 25 ber of resetting attempts will generate a tripping signal. The introduction and use of extinguishable semiconductor elements can also shorten the time interval for switching between positive and negative excitation or vice versa. The introduction of extinguishable semiconductor elements in the two 30 way over-voltage protection makes temporary reversal of the field voltage unnec essary in order to extinguish an activated and conducting semiconductor element.
Claims (18)
1. A rotary electric machine of alternating current type designed to be connected directly to a distribution or transmission network and comprising at 5 least one electric winding, characterized in that the winding comprises at least one electric conductor, a first layer with semiconducting properties surrounding the conductor, a solid insulating layer surrounding the first layer and a second layer with semiconducting properties surrounding the insulating layer, and also in that a brushless excitation system, switchable between positive and negative exci 10 tation, is arranged for excitation of the machine.
2. A machine as claimed in claim 1, characterized in that the potential on the first layer is substantially equal to the potential on the conductor. 15
3. A machine as claimed in claim 1 or claim 2, characterized in that the second layer is arranged to form a substantially equipotential surface surrounding the conductor.
4. A machine as claimed in claim 3, characterized in that the second 20 layer is connected to a predetermined potential.
5. A machine as claimed in claim 4, characterized in that said predeter mined potential is earth potential. 25
6. A machine as claimed in any of the preceding claims characterized in that at least two adjacent layers of the machine's winding have substantially equally large coefficients of thermal expansion.
7. A machine as claimed in any of the preceding claims characterized in 30 that the conductor comprises a number of strands, at least some of which are in electric contact with each other.
8. A machine as claimed in any of the preceding claims, characterized in that each of said three layers is firmly joined to adjacent layers along substantially 35 its entire contact surface.
9. A machine as claimed in any of the preceding claims, characterized in that said layers are arranged to adhere to each other even when the insulated conductor is bent. WO 99/17432 9 PCT/SE98/01741
10. A machine comprising at least one main electric machine of alternating current type designed to be connected directly to a distribution or transmission network and comprising at least one magnetic core and at least one electric 5 winding, characterized in that the winding is formed from a cable comprising one or more current-carrying conductors, each conductor having a number of strands, an inner semiconducting layer arranged around each conductor, an insulating layer of solid insulating material arranged around said inner semiconducting layer, and an outer semiconducting layer arranged around the insulating layer, and in 10 that a brushless excitation system, switchable between positive and negative exci tation, is arranged for excitation of the machine.
11. A machine as claimed in claim 10, characterized in that said cable comprises a metal screen or sheath. 15
12. A machine as claimed in any of the preceding claims, characterized in that the excitation system comprises two controllable antiparallel-connected cur rent converter devices for feeding the field winding (4) of the alternating current machine, a two-way field over-voltage protection means (8, 10, 12, 14) or dis 20 charge circuit connected across the field winding, and control equipment for con trolling current converters and field over-voltage protection means or discharge circuit.
13. A machine as claimed in claim 12, characterized in that for switching 25 the direction of the excitation current from the excitation system, the control equipment is arranged to change the polarity of the current converters, the control equipment causing the over-voltage protection means to be temporarily con nected at transition from one to the other current direction. 30
14. A machine as claimed in claim 12 or claim 13 characterized in that the over-voltage protection means or the discharge circuit comprises a two-way thyris tor discharge circuit (8, 10).
15. A machine as claimed in any of claims 12-14, characterized in that an 35 activated over-voltage protection means or discharge circuit can be reset by con trol of conducting converter devices (1, 2) to temporary or pulse-formed change of polarity. WO 99/17432 10 PCT/SE98/01741
16. A machine as claimed in any of claims 12-14, characterized in that an activated over-voltage protection means or discharge circuit can be reset by means of extinguishable semiconductor elements. 5
17. An electric power plant, characterized in that it comprises a rotary electric machine as claimed in any of claims 1-16.
18. A method of exciting a rotary electric machine with both positive and negative excitation current direction, characterized in that a two-way field over 10 voltage protection means (8, 10, 12, 14) or a two-way discharge circuit is con nected temporarily across the field winding (4) of the machine when switching between excitation current directions.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9703555 | 1997-09-30 | ||
SE9703555A SE512721C2 (en) | 1997-09-30 | 1997-09-30 | Rotary electric machine, machine comprising at least one rotating electric main machine and electric power plant comprising a rotating electric machine and method for magnetizing a rotating electric machine |
PCT/SE1998/001741 WO1999017432A1 (en) | 1997-09-30 | 1998-09-29 | A rotary electric machine |
Publications (2)
Publication Number | Publication Date |
---|---|
AU9292198A true AU9292198A (en) | 1999-04-23 |
AU736279B2 AU736279B2 (en) | 2001-07-26 |
Family
ID=20408451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU92921/98A Ceased AU736279B2 (en) | 1997-09-30 | 1998-09-29 | A rotary electric machine |
Country Status (15)
Country | Link |
---|---|
EP (1) | EP1020012A1 (en) |
JP (1) | JP2001518780A (en) |
KR (1) | KR20010052083A (en) |
CN (1) | CN1272246A (en) |
AU (1) | AU736279B2 (en) |
BR (1) | BR9812569A (en) |
CA (1) | CA2305422A1 (en) |
EA (1) | EA002196B1 (en) |
IL (1) | IL134819A0 (en) |
NO (1) | NO20001318D0 (en) |
NZ (1) | NZ503658A (en) |
PL (1) | PL339569A1 (en) |
SE (1) | SE512721C2 (en) |
WO (1) | WO1999017432A1 (en) |
ZA (1) | ZA988874B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RO126983A0 (en) * | 2011-06-03 | 2011-12-30 | Bultoc Călin | Low speed electric generator |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT340523B (en) * | 1976-04-27 | 1977-12-27 | Hitzinger & Co Dipl Ing | BRUSHLESS SYNC GENERATOR |
DE2622309C3 (en) * | 1976-05-19 | 1979-05-03 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Protective device for a brushless synchronous machine |
SU873370A1 (en) * | 1979-03-11 | 1981-10-15 | Предприятие П/Я М-5113 | Synchronous machine excitation system |
US5036165A (en) * | 1984-08-23 | 1991-07-30 | General Electric Co. | Semi-conducting layer for insulated electrical conductors |
DE3543106A1 (en) * | 1985-12-06 | 1987-06-11 | Kabelmetal Electro Gmbh | ELECTRIC CABLE FOR USE AS WINDING STRING FOR LINEAR MOTORS |
-
1997
- 1997-09-30 SE SE9703555A patent/SE512721C2/en not_active IP Right Cessation
-
1998
- 1998-09-29 CN CN98809669A patent/CN1272246A/en active Pending
- 1998-09-29 IL IL13481998A patent/IL134819A0/en unknown
- 1998-09-29 EP EP98945745A patent/EP1020012A1/en not_active Withdrawn
- 1998-09-29 CA CA002305422A patent/CA2305422A1/en not_active Abandoned
- 1998-09-29 WO PCT/SE1998/001741 patent/WO1999017432A1/en not_active Application Discontinuation
- 1998-09-29 JP JP2000514384A patent/JP2001518780A/en active Pending
- 1998-09-29 NZ NZ503658A patent/NZ503658A/en unknown
- 1998-09-29 KR KR1020007003465A patent/KR20010052083A/en not_active Application Discontinuation
- 1998-09-29 BR BR9812569-9A patent/BR9812569A/en not_active IP Right Cessation
- 1998-09-29 AU AU92921/98A patent/AU736279B2/en not_active Ceased
- 1998-09-29 EA EA200000363A patent/EA002196B1/en not_active IP Right Cessation
- 1998-09-29 ZA ZA988874A patent/ZA988874B/en unknown
- 1998-09-29 PL PL98339569A patent/PL339569A1/en unknown
-
2000
- 2000-03-14 NO NO20001318A patent/NO20001318D0/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
IL134819A0 (en) | 2001-05-20 |
PL339569A1 (en) | 2000-12-18 |
EA200000363A1 (en) | 2000-12-25 |
SE512721C2 (en) | 2000-05-02 |
NO20001318L (en) | 2000-03-14 |
SE9703555D0 (en) | 1997-09-30 |
EA002196B1 (en) | 2002-02-28 |
NZ503658A (en) | 2001-11-30 |
WO1999017432A1 (en) | 1999-04-08 |
CA2305422A1 (en) | 1999-04-08 |
NO20001318D0 (en) | 2000-03-14 |
SE9703555L (en) | 1999-03-31 |
ZA988874B (en) | 1999-06-04 |
EP1020012A1 (en) | 2000-07-19 |
JP2001518780A (en) | 2001-10-16 |
CN1272246A (en) | 2000-11-01 |
BR9812569A (en) | 2000-08-01 |
KR20010052083A (en) | 2001-06-25 |
AU736279B2 (en) | 2001-07-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR100382963B1 (en) | Rotary Electric Machine Plant | |
EA002958B1 (en) | A wing power plant | |
US6873080B1 (en) | Synchronous compensator plant | |
US6465979B1 (en) | Series compensation of electric alternating current machines | |
AU9291698A (en) | Electromagnetic device | |
AU736272B2 (en) | An electric power plant | |
AU736279B2 (en) | A rotary electric machine | |
MXPA00003035A (en) | A rotary electric machine | |
AU736226B2 (en) | Rotating electric machine with magnetic circuit | |
WO1999029017A1 (en) | A method for manufacturing a stator for a rotating electric machine, where the stator winding includes joints, a stator and a rotating electric machine | |
WO1999029034A1 (en) | A method and a system for speed control of a rotating electrical machine with flux composed of two quantities | |
WO1999017433A2 (en) | An electric power plant | |
AU1580299A (en) | Switch gear station | |
CA2305421A1 (en) | Synchronous machine | |
WO2000073102A1 (en) | A device for generating a one-phase alternating voltage | |
MXPA99006971A (en) | Series compensation of electric alternating current machines |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
DA3 | Amendments made section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS AS SHOWN IN THE STATEMENT(S) FILED 20000317 |
|
FGA | Letters patent sealed or granted (standard patent) |