SI22651A2 - Internal rotor of electric machine with permanent magnets - Google Patents

Internal rotor of electric machine with permanent magnets Download PDF

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Publication number
SI22651A2
SI22651A2 SI200700226A SI200700226A SI22651A2 SI 22651 A2 SI22651 A2 SI 22651A2 SI 200700226 A SI200700226 A SI 200700226A SI 200700226 A SI200700226 A SI 200700226A SI 22651 A2 SI22651 A2 SI 22651A2
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Slovenia
Prior art keywords
rotor
rotor blade
permanent magnets
permanent
electric machine
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SI200700226A
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Slovenian (sl)
Inventor
Miljavec Damijan
Zidariäś Bogomir
Bajec Primoĺ˝
Urĺ Iäś Peter
Jereb Peter
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Miljavec Damijan
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Priority to SI200700226A priority Critical patent/SI22651A2/en
Publication of SI22651A2 publication Critical patent/SI22651A2/en

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Abstract

The use of a special construction of a rotor blade of electric machine with permanent magnets on the internal rotor results in an enhanced external torque on the axis of the electric machine operating as an electric drive with permanent magnets or results in an enhanced output power of the electric machine operating as an electric generator with permanent magnets, reduces the losses in permanent magnets and improves the dissipation of heat due to the anticipated losses in the rotor iron. The rotor blade (B) of the internal rotor is made from ferromagnetic material of required thickness. It includes an internal part, which is next to the air gap (P) as well as an external part. Both parts of the rotor blade (B) are linked by a thermal bridge (G). The rotor blade (B) includes main grooves (H1) for locating the main magnetised permanent magnets (N1) and auxiliary grooves (H2) for locating auxiliary magnetised permanent magnets (N2). On both sides of the main groove (H1) there are magnetised piers (K) separating the grooves (H1) and (H2). The core of the magnetic pier (K) can be located on the external part, the internal part or both parts simultaneously. On the internal part, this is on the side of the air gap (P) beneath the main groove (H1) there is a ferromagnetic bulge (L). Between the ferromagnetic bulge (L) and the thermal bridge (G) there is a ferromagnetic link (M) linking the rotor blade into a single entity. Magnetised permanent magnets (N1) are inserted into the main grooves (H1). The Auxiliary magnetised permanent magnets (N2) are inserted in the auxiliary grooves (H2). The magnetising direction of the auxiliary permanent magnets (H2) is between 0 and 360 degrees regarding the magnetisation of the main magnetised permanent magnets (N1).

Description

NOTRANJI ROTOR ELEKTRIČNEGA STROJA S TRAJNIMI MAGNETIINTERNAL ROTOR OF ELECTRICAL MACHINE WITH PERMANENT MAGNETS

Področje tehnike, na katerega se nanaša izum so električni stroji s trajnimi magneti.The subject matter of the invention is permanent magnet electric machines.

V osnovi so električni stroji s trajnimi magneti na rotorju sestavljeni iz rotorja in statorja. Rotorje lahko zunanji ali notranji, v tem primeru notranji. Rotor vsebuje primerno število trajnih magnetov, ki so primernih dimenzij. Stator je sestavljen iz večjega števila zobov. Med posameznimi zobmi so utori v katere so vstavljena statorska vzbujalna navitja. Statorska navitja so lahko eno. dvo. tri ali več fazna ter poljubnega števila polovih parov.Basically, electric machines with permanent magnets on the rotor consist of a rotor and a stator. The rotors can be external or internal, in this case internal. The rotor contains an appropriate number of permanent magnets of suitable dimensions. The stator consists of a large number of teeth. Between the individual teeth are grooves into which stator excitation windings are inserted. Stator windings can be one. two. three or more phases and any number of half pairs.

Vsebina patentne prijave se bo navezovala na dvig izhodnega navora električnega stroja s trajnimi magneti delujočega kot električni motor, oziroma dvig izhodne električne moči električnega stroja s trajnimi magneti delujočega kot električni generator, znižanje izgub v trajnih magnetih ter boljše odvajanje toplote zaradi proizvedenih izgub v železu rotorja z novo konstrukcijo notranjega rotorja električnega stroja s trajnimi magneti.The contents of the patent application will relate to raising the output torque of a permanent magnet electric machine acting as an electric motor, or raising the output electric power of a permanent permanent electric electric machine acting as an electric generator, reducing the losses in permanent magnets and better heat dissipation due to the produced losses in the rotor iron. with the new construction of the internal rotor of a permanent magnet electric machine.

Tehnični problem, ki ga rešuje izum. je takšna konstrukcija notranjega rotorja električnega stroja s trajnimi magneti s katero se bo povečal izhodni navor električnega stroja s trajnimi magneti delujočega kot električni motor, oziroma dvignila izhodna električna moč električnega stroja s trajnimi magneti delujočega kot električni generator, znižale se bodo izgube v trajnih magnetih ter izboljšalo se bo odvajanje toplote zaradi proizvedenih izgub v železu rotorja.A technical problem solved by the invention. such is the construction of an internal rotor of a permanent magnet electric machine that will increase the output torque of a permanent magnet electric motor acting as an electric motor, or raise the output electric power of a permanent magnet electric machine acting as an electric generator; the heat dissipation due to the produced losses in the rotor iron will be improved.

Znanih je več načinov povečanja navora na gredi električnega motorja s trajnimi magneti, oziroma dviga izhodna moč električnega generatorja s trajnimi magneti. Klasična rešitev je s povečanjem radialne širine ter obodne dolžine trajnih magnetov na notranjem rotorju pri čemer postane problem mehanska trdnost rotorja. Centrifugalne sile hočejo iztrgati trajne magnete z rotorjeve površine. Če pa so trajni magneti globlje v rotorskem paketu postanejo centrifugalne sile še večje, zaradi dodatnega feromagnetnega materiala med trajnimi magneti in zračno režo.There are several ways to increase the torque on the shaft of a permanent magnet electric motor, or to increase the output power of a permanent magnet electric generator. The classic solution is to increase the radial width and the circumferential length of the permanent magnets on the inner rotor, making the mechanical strength of the rotor a problem. Centrifugal forces want to rip permanent magnets off the rotor surface. However, if the permanent magnets are deeper in the rotor package, the centrifugal forces become even larger due to the additional ferromagnetic material between the permanent magnets and the air gap.

Prav tako je znana rešitev s postavitvijo trajnih magnetov na obodu rotorja v t. i. Hallbach-ovi mreži. S tem se doseže koncentracija magnetnega pretoka. Ostane pa vseeno problem mehanske trdnosti rotorja. S takšno postavitvijo magnetov (Hallbach-ova mreža) so pri notranjem rotorju trajni magneti izpostavljeni spremembi reluktance statorja in s tem dodatnemu segrevanju, zaradi induciranih vrtinčnih tokov.Also known is a solution by placing permanent magnets on the rotor circumference in t. i. Hallbach's network. This achieves a magnetic flux concentration. However, the mechanical strength of the rotor remains. With this arrangement of magnets (Hallbach's net), permanent magnets are exposed to changes in the stator reluctance in the inner rotor and thus additional heating due to the induced eddy currents.

Po izumu je povečanje izhodnega navora električnega stroja s trajnimi magneti delujočega kot električni motor, oziroma dvig izhodne električne moči električnega stroja s trajnimi magneti delujočega kot električni generator, znižanje izgub v trajnih magnetih ter izboljšanje odvajanja toplote, zaradi proizvedenih izgub z železu rotorja rešen s konstrukcijo rotorske lamele in načinom postavitve trajnih magnetov v paket rotorskih lamel notranjega rotorja električnega stroja s trajnimi magneti. Izum bo opisan na izvedbenem primeru in slikah, ki prikazujejo:According to the invention, increasing the output torque of a permanent magnet electric machine acting as an electric motor, or increasing the output electric power of a permanent magnet electric machine acting as an electric generator, reducing losses in permanent magnets and improving heat dissipation due to the losses produced by the rotor's iron rotor blades and the method of placing permanent magnets in the rotor blades of the internal rotor of a permanent magnet electric machine. The invention will be described in the embodiment and in the drawings showing:

Sl. 1. Prečni prerez celotnega električnega stroja s trajnimi magneti na notranjem rotorju.FIG. 1. Cross-section of the entire permanent magnet electric machine on the internal rotor.

Sl. 2. Detajlni prerez rotorske lamele električnega stroja s trajnimi magneti na notranjem rotorju z magnetnim pomolom na zunanjem delu.FIG. 2. Detail cross-section of the rotor blade of a permanent magnet electric machine on the inner rotor with a magnetic pier on the outside.

Sl. 3. Detajlni prerez rotorske lamele električnega stroja s trajnimi magneti na notranjem rotorju z magnetnim pomolom na notranjem delu.FIG. 3. Detail section of the rotor blade of a permanent magnet electric machine on the inner rotor with a magnetic pier on the inner part.

Sl. 4. Detajlni prerez rotorske lamele električnega stroja s trajnimi magneti na notranjem rotorju z magnetnim pomolom na notranjem in zunanjem delu.FIG. 4. Detail cross-section of the rotor blade of a permanent magnet electric machine on the inner rotor with a magnetic pier on the inner and outer parts.

Električni stroj s trajnimi magneti na notranjem rotorju tvorijo sestav notranjega lameliranega rotorskega paketa iz feromagnetnih rotorskih lamel B ter feromagnetnega lameliranega statorja C z vzbujalnimi navitji D. Na sliki 1 je le kot primer prikazano eno vzbujalno navitje D. V posebno oblikovan rotorski paket sestavljen iz rotorskih lamel B so v glavne utore HI in pomožne utore H2 vstavljeni glavni trajni magneti NI in pomožni trajni magneti N2. Po dva sosednja glavna trajna magneta NI ter na vsaki strani glavnega magneta NI po dva pomožna trajna magneta N2 tvorita magnetni polov par gledano iz zračne reže med statorjem C in lameliranim rotorskim paketom B. Rotorska lamela B notranjega rotorja (Sl. 2.) je iz feromagnetnega materiala želene debeline. Vsebuje notranji del. ki je ob zračni reži P med statorjem C in rotorjem B in zunanji del, katera sta v nadaljevanju opisanih in v mejah predpisanih kontur. Oba dela povezuje toplotni most G. Rotorska lamela B vsebuje glavne utore HI za namestitev namagnetenih glavnih trajnih magnetov N I in pomožne utore H2 za namestitev namagnetenih pomožnih trajnih magnetov N2. Smer namagnetenosti pomožnih trajnih magnetov N2 je v smereh od 0° do 360 glede na smer namagnetenosti glavnih trajnih magnetov NI. Na obeh straneh glavnega utora HI sta magnetna pomola K in ločita utora HI in H2 (Sl. 2.). Magnetni pomoli K so radialne višine od 5% doAn electrical machine with permanent magnets on the internal rotor forms an assembly of an internal lamellar rotor package of ferromagnetic rotor blades B and a ferromagnetic laminated stator C with excitation windings D. In Figure 1, only one excitation winding D. is shown as an example. of lamellae B, main NI permanent magnets and auxiliary permanent N2 magnets are inserted into the HI main slots and Auxiliary slots H2. Two adjacent main permanent NI magnets, and on each side of the main NI magnet, two auxiliary permanent permanent magnets N2, form a magnetic pole pair from the air gap between stator C and lamellar rotor package B. The rotor blade B of the inner rotor (Fig. 2) is from ferromagnetic material of desired thickness. It contains the inner part. which is adjacent to the air gap P between stator C and rotor B and the outer portion, both of which are described below and within the prescribed contours. Both parts are connected by thermal bridge G. The rotor blade B contains HI main grooves for the installation of magnetized main permanent magnets N I and auxiliary grooves H2 for the installation of magnetized auxiliary permanent magnets N2. The magnetization direction of the N2 auxiliary permanent magnets is in the direction from 0 ° to 360 in relation to the magnetization direction of the main NI permanent magnets. On both sides of the main slot HI are magnetic piers K and separate slots HI and H2 (Fig. 2). Magnetic piers K have radial heights from 5% to

100% radialne višine glavnega utora HI in obodne širine od 5% do 100% obodne širine toplotnega mosta G. Obodna širina toplotnega mostu je med 1% in 100% obodne širine glavnih utorov HI za glavne trajne magnete NI. Obodna dolžina pomožnega utora H2 za pomožni trajni magnet je od 1% do 300% obodne dolžine glavnega utora HI. Koren magnetnega pomola Kje lahko na zunanjem delu rotorske lamele B (Sl. 2.) ali na notranjem delu rotorske lamele B (Sl. 3), oziroma na obeh delih sočasno (Sl. 4). Na notranjem delu rotorske lamele B, to je na strani zračne reže P med statorjem C in rotorjem B je pod glavnim utorom HI feromagnetna odebelitev L, katera preprečuje induciranje vrtinčnih tokov v glavnih trajnih magnetih NI. Med feromagnetno odebelitvijo L in toplotnim mostom G je feromagnetna povezava M, ki povezuje rotorsko lamelo B v celoto. Feromagnetna povezava M ima tudi vlogo prenosa toplote iz feromagnetne odebelitve L do toplotnega mosta G. Radialna višina feromagnetne odebelitve je od 5% do 500% radialne višine glavnega utora HI, medtem ko je radialna višina feromagnetne povezave od 10% do 100% radialne višine feromagnetne odebelitve L. V glavne utore HI se vstavi namagnetene glavne trajne magnete NI. Na slikah 2, 3 in 4 sta prikazana le po en glavni trajni magnet NI in le po dva pomožna trajna magneta N2. V pomožne utore H2 se ustavi pomožne trajne magnete N2. Smer namagnetenosti pomožnih trajnih magnetov N2 je med 0 in 360° glede na smer namagnetenosti glavnih trajnih magnetov NI.100% of the radial height of the HI main groove and the circumferential width from 5% to 100% of the circumferential width of the thermal bridge G. The circumferential width of the thermal bridge is between 1% and 100% of the circumferential width of the HI main grooves for the main permanent magnets NI. The circumferential length of the auxiliary groove H2 for the auxiliary permanent magnet is from 1% to 300% of the circumferential length of the main groove HI. Magnetic Pier Root Where on the outside of rotor blade B (Fig. 2) or on the inside of rotor blade B (Fig. 3), or simultaneously on both parts (Fig. 4). On the inner part of the rotor blade B, that is, on the side of the air gap P between the stator C and the rotor B, there is a ferromagnetic thickening L under the main groove HI, which prevents the induction of eddy currents in the main permanent magnets NI. Between the ferromagnetic thickening L and the thermal bridge G, there is a ferromagnetic connection M connecting the rotor blade B to the whole. The ferromagnetic connection M also plays the role of heat transfer from the ferromagnetic thickening L to the thermal bridge G. The radial height of the ferromagnetic thickening is from 5% to 500% of the radial height of the main groove HI, while the radial height of the ferromagnetic connection is from 10% to 100% of the radial height of the ferromagnetic thickening L. The magnetized main permanent magnets NI are inserted into the main grooves of the HI. Figures 2, 3 and 4 show only one main permanent NI magnet and only two auxiliary permanent N2 magnets. The auxiliary grooves of H2 stop the auxiliary permanent magnets N2. The magnetization direction of the N2 auxiliary permanent magnets is between 0 and 360 ° with respect to the magnetization direction of the main NI permanent magnets.

Claims (12)

PATENTNI ZAHTEVKIPATENT APPLICATIONS 1. Notranji rotor električnega stroja s trajnimi magneti, ki vsebuje zunanji stator z električnim navitjem, ki ima povečan izhodni navor na gredi stroja delujočega kot električni motor s trajnimi magneti, oziroma povišano izhodno električno moč stroja delujočega kot električni generator s trajnimi magneti, znižane izgube v trajnih magnetih ter izboljšano odvajanje toplote zaradi proizvedenih izgub z železu rotorja, označen s tem, da ima rotorska lamela (B) toplotni most (G), magnetni pomol (K) s korenom iz zunanjega oziroma notranjega dela rotorske lamele (B) ali iz obeh delov rotorske lamele (B), feromagnetno odebelitev (L), feromagnetno povezavo (M), glavne utore (HI) za glavne trajne magnete (N 1) in pomožne utore (H2) za pomožne trajne magnete (N2).1. Internal rotor of a permanent magnet electric machine, comprising an external stator with electric winding having an increased output torque on the shaft of the machine acting as a permanent magnet electric motor, or an increased electrical output of the machine acting as a permanent magnet electric generator, reduced losses in permanent magnets and improved heat dissipation due to the produced losses from the rotor iron, characterized in that the rotor blade (B) has a thermal bridge (G), a magnetic pier (K) with root from the outer or inner part of the rotor blade (B) or from both parts of the rotor blade (B), the ferromagnetic thickening (L), the ferromagnetic connection (M), the main grooves (HI) for the main permanent magnets (N 1) and the auxiliary grooves (H2) for the auxiliary permanent magnets (N2). 2. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1. označen s tem, da ima rotorska lamela (B) toplotni most (G) obodne dolžina od 1% do 100% obodne dolžine glavnega utora (H 1) za glavne trajne magnete (N 1).The permanent rotor of a permanent magnet electric machine according to claim 1, characterized in that the rotor blade (B) has a thermal bridge (G) having a circumferential length of 1% to 100% of the circumferential length of the main groove (H 1) for the main permanent magnets. (N 1). 3. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1. označen s tem, da ima rotorska lamela magnetni pomol (K) radialne višine od 5% do 100% radialne višine glavnega utora (HI) s korenom iz zunanjega dela rotorske lamele (B).The permanent rotor of a permanent magnet electric machine according to claim 1, characterized in that the rotor blade has a magnetic pier (K) of radial height from 5% to 100% of the radial height of the main groove (HI) with a root from the outer part of the rotor blade ( B). 4. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1 in patentnem zahtevku 3. označen s tem da, ima rotorska lamela magnetni pomol (K) obodne dolžine od 5% do 90% obodne širine toplotnega mosta (G) s korenom iz zunanjega dela rotorske lamele (B).The permanent rotor of a permanent magnet electric machine according to claim 1 and claim 3, characterized in that the rotor blade has a magnetic pier (K) of circumferential length from 5% to 90% of the circumferential width of the thermal bridge (G) with root from the outer parts of the rotor blade (B). 5. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1. označen s tem da, ima rotorska lamela magnetni pomol (K) radialne višine od 5% do 100% radialne višine glavnega utora (HI) s korenom iz notranjega dela rotorske lamele (B).The permanent rotor of a permanent magnet electric machine according to claim 1, characterized in that the rotor blade has a magnetic pier (K) of radial height from 5% to 100% of the radial height of the main groove (HI) with a root from the inner part of the rotor blade ( B). 6. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1 in patentnem zahtevku 5. označen s tem da. ima rotorska lamela magnetni pomol (K) obodne dolžine od 5% do 90% obodne širine toplotnega mosta (G) s korenom iz notranjega dela rotorske lamele (B).6. Internal rotor of a permanent magnet electric machine according to claim 1 and claim 5, characterized in that. the rotor blade has a magnetic pier (K) of circumferential length from 5% to 90% of the circumferential width of the thermal bridge (G) with a root from the inner part of the rotor blade (B). 7. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1, patentnem zahtevku 3, patentnem zahtevku 4, patentnem zahtevku 5 in patentnem zahtevku 6, označen s tem da. ima rotorska lamela magnetna pomola (K) s korenoma iz zunanjega in iz notranjega dela rotorske lamele (B) sočasno.7. Internal rotor of a permanent magnet electric machine according to claim 1, claim 3, claim 4, claim 5 and claim 6, characterized in that. the rotor blade has a magnetic pier (K) with roots from the outside and inside of the rotor blade (B) simultaneously. 8. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1. označen s tem, da ima rotorska lamela (B) magnetno odebelitev (L) med glavnim utorom (HI) in zračno režo (P) radialne višine od 5% do 500% radialne višine glavnega utora (HI).8. The permanent rotor of a permanent magnet electric machine according to claim 1, characterized in that the rotor blade (B) has a magnetic thickening (L) between the main groove (HI) and the air gap (P) of radial height from 5% to 500% radial height of the main groove (HI). 9. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1. označen s tem, da ima rotorska lamela (B) feromagnetno povezavo (M) med toplotnim mostom (G) in feromagnetno odebelitvijo (L) radialne višine od 10% do 100% radialne višine feromagnetne odebelitve (L).The permanent rotor of a permanent magnet electric machine according to claim 1, characterized in that the rotor blade (B) has a ferromagnetic connection (M) between the thermal bridge (G) and a ferromagnetic thickening (L) of radial height from 10% to 100% radial heights of ferromagnetic thickening (L). 10. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1, označen s tem, da ima rotorska lamela (B) glavne utore (HI) v katere se vstavi glavne trajne magnete.The permanent rotor of a permanent magnet electric machine according to claim 1, characterized in that the rotor blade (B) has main grooves (HI) into which the main permanent magnets are inserted. 11. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1, označen s tem. da ima rotorska lamela (B) pomožne utore (H2) v katere se vstavi pomožne trajne magnete.The permanent rotor of a permanent magnet electric machine according to claim 1, characterized in. that the rotor blade (B) has auxiliary grooves (H2) into which auxiliary permanent magnets are inserted. 12. Notranji rotor električnega stroja s trajnimi magneti po patentnem zahtevku 1, patentnem zahtevku 10 in patentnem zahtevku 11, označen s tem, da je smer namagnetenosti pomožnih trajnih magnetov (N2) med 0° in 360° glede na smer namagnetenosti glavnih trajnih magnetov (NI).The permanent rotor of a permanent magnet electric machine according to claim 1, claim 10 and claim 11, characterized in that the magnetization direction of the auxiliary permanent magnets (N2) is between 0 ° and 360 ° with respect to the magnetization direction of the main permanent magnets ( NI).
SI200700226A 2007-09-18 2007-09-18 Internal rotor of electric machine with permanent magnets SI22651A2 (en)

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SI22651A2 true SI22651A2 (en) 2009-04-30

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