SE455247B

SE455247B - Three=phase generator with winding-free rotor

Info

Publication number: SE455247B
Application number: SE8702803A
Authority: SE
Inventors: Assar Nordebo
Original assignee: Assar Nordebo
Priority date: 1987-07-08
Filing date: 1987-07-08
Publication date: 1988-06-27
Also published as: SE8702803D0

Abstract

The rotor is of dynamo plate or other conductive material, and the stator poles are of material with similar magnetic properties, each pole being enclosed by a concentric magnetising winding. There is an even number of stator poles, equal to the number of rotor poles, and the rotor pole width is approx. half the distribution of the stator poles. The stator poles have tracks with even or uneven distribution. A three-phase system is only obtained with connected windings which have track stages approx. the same as the pole distribution, and in a twin-poled generator with even slot distribution, the number of slots per pole is two, as is the number of windings. A symmetrical three-phase system is obtained where the adjacent outputs (B1,B2) of the two windings in the one stator pole are joined to the output (R) of the three-phase system. The second and third outputs (S,T) of the system comprise the adjacent winding ends (S1,S2) of the other pole.

Description

455 247 2 Uppfinningen är åskådliggjord i figur l där ett polpar (l4) med rotor (13), magnetiseringslindning (l5) och den nya växelströmslindningen som utgöres av endast två härvor är visade. De två lindningarnas när- liggande börjanändar, B] och B2, i den ena statorpolen är förenade till uttaget R. De två i den andra statorpolen närliggande slutändarna S1 och S2 blir då uttagen S och T, så att ett symetriskt trefassystem R S T erhålles. The invention is illustrated in Figure 1 where a pole pair (14) with rotor (13), excitation winding (15) and the new AC winding which consists of only two coils are shown. The adjacent start ends of the two windings, B] and B2, in one stator pole are connected to the socket R. The two end ends S1 and S2 near the other stator pole are then sockets S and T, so that a symmetrical three-phase system R S T is obtained.

Vågdiagram och visardiagram i figur l visar hur summan av de två huvud- spänningarna eTR och eRS blir den tredje huvudspänningen eST.Wave diagrams and pointer diagrams in Figure 1 show how the sum of the two main voltages eTR and eRS becomes the third main voltage eST.

De kurvformer som visas i vâgdiagrammet i figur l är vad som erhålles vid konstant luftgap. Genom avrundning av rotorpolerna såsom visas i figur 2, eller genom sneddning av rotorpolerna, går spänningen mot sinusform.The waveforms shown in the scale diagram in Figure 1 are those obtained at constant air gap. By rounding the rotor poles as shown in Figure 2, or by tilting the rotor poles, the voltage goes towards the sinusoidal shape.

Generatorn har goda egenskaper inom många tillämpningsområden. Den har ett stort varvtalsområde från låga till mycket höga varvtal.The generator has good properties in many application areas. It has a large speed range from low to very high speeds.

Frekvensen f = p fn/60 där p är poltalet och n är varvtalet per minut.The frequency f = p fn / 60 where p is the pole number and n is the speed per minute.

Jämförd med en konventionell generator med lindad rotor är effektut- bytet per viktsenhet mycket nära dennas.Compared to a conventional generator with a wound rotor, the power output per unit weight is very close to that.

Beräkning av kvoten Pcuv/Pcun mellan kopparförlusterna vid de två kopp- lingarna har utförts i anslutning till figurerna 5 och 6 som visar det tidigare utförandet i D-koppling och det nya utförandet i V-koppling.Calculation of the ratio Pcuv / Pcun between the copper losses at the two couplings has been performed in connection with Figures 5 and 6, which show the previous embodiment in D-coupling and the new embodiment in V-coupling.

Vid beräkningen har sinusformad spänning förutsätts.In the calculation, sinusoidal voltage is assumed.

Resultatet visar att vid ett vanligt dimensionsförhållande, spårlängd L och härvände L/2, hos härva med långt härvsteg, blir nämnda kvot 0,84.The result shows that at a normal dimensional ratio, groove length L and reversal L / 2, in the case of a coil with a long warp step, said ratio becomes 0.84.

Den minskade förlusten har i praktiken visat sig ge en bättre prestanda- kurva vid användning av generatorn som laddningsgenerator.The reduced loss has in practice been shown to give a better performance curve when using the generator as a charge generator.

Då den axiella längden blir mycket stor hos generatorn i förhållande till härvändarnas längd kan man bortse från resistansen i härvändarna.As the axial length of the generator becomes very large in relation to the length of the coil ends, the resistance in the coil ends can be ignored.

Det minsta värdet på den beräknade kvoten går då mot 0,75.The minimum value of the calculated quota then goes towards 0.75.

M-íu-sw 3 455 247 Beräkning av kopparförïusten i växeïströmsïindningarna vid D-koppling, PCUD och vid V-koppling Pcuv, då utuffekt och uttagen ström är ïika vid båda koppïingarna.M-íu-sw 3 455 247 Calculation of the copper loss in the growth current windings at D-coupling, PCUD and at V-coupling Pcuv, when output power and current drawn are equal at both couplings.

Beteckningar enïigt figurerna 5 och 6 fasresistans uttagen ström från systemet, ïinjeström 'Hndningsvarv per *Fas trådarea ïängd av härvdeïar. f"'0¥ZC.-X I! ll Il lI II A"Å ffâaﬁ 5 _ _ k-/v êz. /ç/v 'Q/'R3" 0 (2¿*ï =-0-_'3L Åâa-kgldf4m+íš =¿<^/.28¿. é Û T Rub ï/åfßêëå' 23¿+2_â¿) _12 _1094 swës “. ' Û .6 :s 0 6 P »_312- k__á.áíf cub a /8 20 ,4:/^/ 1% /ß/ai /EÜV 7235' ~Ö/_'å ~ Ü? Û 3 pg 3'/ c l_/_ : 8 20/84 fšëtfeö 65 Å? -000 Û-“f/'f//Ü /Oçﬂocfë/ﬂ Å »ífffë/ d .s/Of" f fßlfÅcff//o/ø a/c /M/ /šáß-zfucïø cí-»f/»os 40/7 /220/2 áy;f,éc fesf- g/onssc-r/v ß 4/6550.Designations according to Figures 5 and 6 phase resistance current drawn from the system, line current 'Turning speed per * phase wire area in length of winding parts. f "'0 ¥ ZC.-X I! ll Il lI II A" Å ffâa ﬁ 5 _ _ k- / v êz. / ç / v 'Q /' R3 "0 (2¿ * ï = -0 -_ '3L Åâa-kgldf4m + íš = ¿<^ /. 28¿. é Û T Rub ï / åfßêëå' 23¿ + 2_â¿ ) _12 _1094 swës “. 'Û .6: s 0 6 P» _312- k__á.áíf cub a / 8 20, 4: / ^ / 1% / ß / ai / EÜV 7235' ~ Ö / _ 'å ~ Ü ? Û 3 pg 3 '/ c l _ / _: 8 20/84 fšëtfeö 65 Å? -000 Û- “f /' f // Ü / Oç ﬂ ocfë / ﬂ Å» ífffë / d .s / Of "f fßlfÅcff // o / ø a / c / M / / šáß-zfucïø cí- »f /» os 40/7 / 220/2 áy; f, éc fesf- g / onssc-r / v ß 4/6550.

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Claims

Claim three-phase generator with winding-free rotor of dynamo plate or other flow-conducting material and with stator poles with similar magnetic properties where each stator pole is enclosed by a concentric magnetizing winding and where the stator pole number is an even number and equal to the rotor pole number and the rotor pole width is approximately halve and the stator poles have grooves occupied with even or uneven pitch, characterized in that a three-phase system is obtained only with interconnected coils having the track step approximately equal to the pole pitch and that in such a two-pole generator with even track pitch the track number per pole is two and the total the number of coils is only two in the coiled phase winding design, whereby a symmetrical three-phase system is obtained when these two coils' adjacent sockets (B1 and 82), in one stator pole, are connected to the three-phase system sockets R and the system's second and third sockets consists of the adjacent winding ends (S1 and S2) id a second pole. .... ... m., ..., an-unu ..... .. ~ _-v-M -.- m4- ».