DE4115887A1 - Permanent magnet rotor dynamoelectric machine - has rotor-coaxial stator coil with axial flux paths in rotor and stator - Google Patents

Permanent magnet rotor dynamoelectric machine - has rotor-coaxial stator coil with axial flux paths in rotor and stator

Info

Publication number
DE4115887A1
DE4115887A1 DE19914115887 DE4115887A DE4115887A1 DE 4115887 A1 DE4115887 A1 DE 4115887A1 DE 19914115887 DE19914115887 DE 19914115887 DE 4115887 A DE4115887 A DE 4115887A DE 4115887 A1 DE4115887 A1 DE 4115887A1
Authority
DE
Germany
Prior art keywords
rotor
sections
electrical machine
stator
poles
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.)
Withdrawn
Application number
DE19914115887
Other languages
German (de)
Inventor
Herbert Dipl Ing Dr Te Auinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to EP90110080 priority Critical
Application filed by Siemens AG filed Critical Siemens AG
Publication of DE4115887A1 publication Critical patent/DE4115887A1/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotor
    • H02K1/2713Inner rotor where the magnetisation axis of the magnets is axial
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotor
    • H02K1/272Inner rotor where the magnetisation axis of the magnets is radial or tangential
    • H02K1/274Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets
    • H02K1/2746Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets consisting of magnets arranged with the same polarity
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotor
    • H02K1/272Inner rotor where the magnetisation axis of the magnets is radial or tangential
    • H02K1/274Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets
    • H02K1/2753Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278Surface mounted magnets; Inset magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02Details
    • H02K21/04Windings on magnets for additional excitation ; Windings and magnets for additional excitation
    • H02K21/046Windings on magnets for additional excitation ; Windings and magnets for additional excitation with rotating permanent magnets and stationary field winding
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotor

Abstract

In the stator (13), coaxial to the rotor axis, at least one control coil (14) of circular form affects the magnetic flux of the opposite poles (N,S). For the differential flux passing through this control coil (14) flux paths are axially directed not only in the stator (13) but also in the rotor (11). At at least one ferromagnetic bearing housing (18) there is an external hook (17) at a small gap (16) from the rotor shaft, the control coil (22) being formed on the outer circumference of hook. Pref., there are hooks on each housing with corresp. control coils. ADVANTAGE - Useful flux altered simply to enable control or regulation for different loads or speeds.

Description

The invention relates to an electrical machine according to the Ober Concept of claim 1.

Such a machine is known from FIG. 5 of DE-A-28 13 701. A disadvantage of such machines is the practically constant magnetic flux determined by the rotor design, since this means that adaptation to different loading conditions and operating speeds is not readily possible. Both as on-board electrical system generators and in drive technology, induction machines with a permanent magnet excited rotor are becoming increasingly important, as they offer some important advantages. The unwrapped rotor of these machines can be designed for high speeds. The magnetic materials available today enable very high machine utilization. Since the torque is generated without rotor currents, there are no rotor losses with the exception of additional parasitic losses. This prevents the rotor and the bearings from heating up. In addition, these machines are very efficient.

The invention has for its object a machine Generic type so that the stator wick easy inducing magnetic flux changed and thus a corresponding control or regulation for different loads and / or operating speeds can be made.  

The problem is solved by the mark nenden features of claim 1. By the specified measure men succeeds, by means of the control coil, that of the permanent magnets originating useful flow and thus the tension Control the current and / or the speed of the machine.

Small dimensions and thus material savings for the Control coil can be in accordance with the characteristics of the Claim 2 designed machine achieve.

In an electrical machine in which the rotor is divided into at least two axially spaced rotor sections and the differently magnetically equipped non-identical poles of each rotor section are geometrically offset from one another by a pole pitch with respect to the adjacent rotor section, as is described in DE-A-14 88 733 ( Fig. 2) is known, a favorable Unterbringungsmög option for the control coil is created in that the stator is divided into a number of rotor sections corresponding to the number of axially spaced stator sections and control coils arranged in the gaps existing between the stator sections are.

Disruptive unipolar flows and shaft voltages on the bearings len can be avoided that the stand and the Läu fer divided into an odd number of sections and the two outer sections each formed half as wide are like the section or sections between them that in each space between the stator sections Control coil is arranged and the control coils alternately are flooded in opposite directions. This also results a reduction in axially over the machine housing and the Rotor shaft leading magnetic flux, so that their Passage cross-sections can be reduced. The same Advantages are also achieved if the Machine arranged symmetrically to each other, in opposite directions flooded control coils are provided.  

The different equipping of the poles of the same name can can be achieved in that only one of the poles of the same name equipped with permanent magnets and the other as pure Iron pole is executed. There is also the possibility of Poles of the same name with different permanent magnets magnetic properties. Here are the Permanent magnets with the lower magnetic strength like this designed and arranged that the passing through the control coil Flux strengthens these magnets.

The same effect can also be achieved in that between the rotor sections and / or the stand sections axially magnetized additional magnets are inserted or also characterized in that between the outer periphery of the stator core and the housing arranged radially magnetized additional magnets are.

One through the transverse component of the armature flooding (armature return effect) caused field distortion can be ver reduce that the rotor poles in the transverse direction an increased ma have magnetic resistance.

The increase in the transverse magnetic resistance leaves can be achieved by moving the rotor poles towards the head have flowing slots or in that the Rotor poles have laminated rotor cores, in which between the individual sheets are arranged in non-magnetic layers. Such embodiments of the rotor laminated core are from Reluctance machines known.

The effect of a damper cage can be achieved that the non-magnetic layers of good electrical conductivity Material.

Based on exemplary embodiments shown in the drawing len, the invention is explained below.

It shows:

Fig. 1 shows the basic structure of a rotor with the same magnetic poles of all the mounting,

Fig. 2 shows the basic structure of a runner with different Licher magnet assembly of poles,

Fig cut. 3 a section of a two stator and rotor sections having four-pole electric machine in the transverse,

Fig. 4 shows a longitudinal section of an upright and two Läuferab sections having four-pole electrical machine, with one half of the two portions is shown rotated 90 ° into the plane of the drawing,

Fig. 5 magnetic characteristics to the rotor design guides of Figs. 1-4,

Fig. 6 shows the dependence of the magnetic fluxes at which various load conditions of the engine of the excitation ampere-turns of the control coil,

Fig. 7 is an electrical machine having disposed on the end shield control coil,

Fig. 8 is an electrical machine with a divided in three sections the stator and rotor,

9 is an electrical machine in which the opposite poles with permanent magnets of different strength be FIGS. Tee t,

Fig. 10 is an electric machine, is arranged in between two Läu ferabschnitten an axially magnetized auxiliary magnet,

Fig. 11 shows the dependence of the magnetic flux from the excitation flux to an electric machine of FIG. 9 or 10,

Figure 12 core. A two-pole rotor with a laminated rotor,

Fig. 13 shows the two-pole rotor in a section along the line XIII-XIII in Fig. 12,

Fig. 14 shows the two-pole rotor in a section along the line XIV-XIV in Fig. 12,

Fig. 15 shows the two-pole rotor in a section along the line XV-XV in Fig. 12,

Figure 16 core. A four-pole rotor with a laminated rotor,

Fig. 17 shows the four-pole rotor in a section along the line XVII-XVII in Fig. 16,

Fig. 18 shows the four-pole rotor in a section along the line XVIII-XVIII in Fig. 16.

In the four-pole rotor 11 shown in FIG. 1, permanent magnets 12 are arranged on the circumference, all poles N and S in a conventional manner having permanent magnets 12 with the same magnetic strength and the same radial thickness.

In contrast, in the four-pole rotor 11 according to FIG. 2, a permanent magnet 12 is arranged only on one (pole N) of two poles N or S of the same name. The other pole S acts as a pure iron pole.

In this embodiment, the permanent magnets 12 have twice the radial thickness as would be required to generate a specific magnetic flux if all the poles N and S were evenly fitted as shown in FIG. 1. In the Läuferausfüh alloys in Fig. 1 and 2 is thus of the same before use of magnetic material.

FIGS. 3 and 4 show a four-pole electric machine, in which both the stator 13 and the rotor 11 in each of two post sections 13 a and 13 b and the rotor sections 11 a and 11 b is divided. The two rotor sections 11 a and 11 b are geometrically offset by a pole pitch, thus 90 °, against each other, the N-poles in the first rotor section 11 a and the S-poles in the second rotor section 11 b being equipped with permanent magnets 12 . In Fig. 4 in the right half of the figure, the upper with a permanent magnet 12 equipped S-pole of the second rotor section 11 b is rotated by 90 ° in the drawing plane. In the left half of the figure, however, the lower bare iron pole 14 is rotated the first rotor section 11 a by 90 ° in the plane of the drawing. This representation has been chosen in a simple manner the mutual depen dependence of the permanent magnets 12 passes through flow Φ 1, the iron poles 14 by releasing Φ 2 and the animal end housing flow resul therefrom Φ G proportional Φ 12, which is a between the stator portions 13 a and 13 b arranged control coil 22 interspersed to show. In the magnetic equivalent circuit diagrams shown, R means the magnetic resistance per pole concentrated on the air gap area, VE the magnetic voltage of the control coil in relation to one machine half. VA the magnetic voltage of the longitudinal component of the armature flow and VM the magnetic voltage in the permanent magnet.

The operation of the machine is to be explained on the basis of the magnetic characteristics shown in FIG . For the sake of clarity, the following idealizations are carried out:

  • 1. Neglected leakage flux in the permanent magnets,
  • 2. Unsaturated iron paths,
  • 3. Straight magnetic characteristics and
  • 4. same air gap resistances R for the magnet and Iron poland.

First, a machine version without flow control is considered. The magnetic characteristic curve designated a applies to a machine with a magnet arrangement according to FIG. 1 and the magnetic characteristic curve designated b for a magnet arrangement according to FIG. 2. Because of the double radial thickness of the permanent magnets 12 , the magnetic characteristic curve b has only half the slope with respect to the magnetic characteristic curve a on. With Φ R the permanent flux, with V C the coercive flow and with Φ · R and Φ · 2R are air gap characteristics, whereby the characteristic Φ · R for a machine according to Fig. 1 and the characteristic Φ · 2R for a machine according to Fig. 2 applies. The intersections with the magnetic characteristics a and b result in the working points 1 and 2 , which are at the same ordinate height. The magnet arrangements according to FIGS. 1 and 2 are therefore equivalent. All poles are penetrated by an equally large flow Φ 1 = Φ 2 and for the useful flow gilt N = Φ 1 + Φ 2 = 2 Φ 1 .

When the electrical machine is subdivided into a plurality of stator and rotor sections 13 a and 13 b or 11 a and 11 b and the corresponding offset of the rotor sections 11 a and 11 b by a pole pitch, as shown in FIGS. 3 and 4, results another mode of operation of the machine, which can be used for flow control by means of the control coil 22 .

With axial flow paths in the stator and rotor, the subdivision of the rotor 11 into two rotor sections 11 a and 11 b has the consequence that without additional excitation (VE = 0) the flow only over the poles equipped with permanent magnets 12 , since he here the lowest magnetic resistance. The iron poles 14 thus remain field-free. For the machine according to FIGS. 3 and 4, according to FIG. 5, when the excitation coil 14 is de-energized, ie additional excitation VE = 0, through the intersection of the air gap characteristic curve ΦR with the magnetic characteristic line b the operating point 3 and thus a flux Φ i , which is only slightly is greater than the flux Φ 1 for the Magnetanordnun conditions according to FIGS. 1 and 2 in working points 1 and 2 . Since the iron poles 14 , as already explained, are field-free, the operating point 4 results for them, ie Φ 2 = 0. The useful flux Φ N = Φ 1 + Φ 2 is thus equal to the flux Φ i and thus only about half as large as the flow in the arrangements of FIGS. 1 and 2 without axial flow paths.

In the iron poles 12 to b the same flux guide to reach as in the fitted with permanent magnet 12 poles, has one of the magnetic voltage VM of the permanent magnets 12 corresponding magnetic voltage VE to be applied by the control coil 14, so that again the operating point 2 on the Magnetic characteristic b is reached. So that the flow Φ 2 in the iron poles 14 is equal to the flow Φ 1 through the poles equipped with the permanent magnets 12 and thus the useful flow Φ N = Φ 1 + Φ 2 = 2Φ 1 . The case flux Φ G, which is proportional to the difference between the fluxes Φ 12 , becomes zero in this case.

Due to the added armature reaction when the machine is loaded (VA = 0), both the flux Φ 1 through the magnetic poles equipped with the permanent magnets 12 and the flux Φ 2 through the iron poles 12 b are reduced. 6 shows in the upper half of the figure the basic dependency of the flows Φ 1 and Φ 2 on the excitation flow VE with increasing longitudinal component VA of the anchor reaction. The characteristic curves marked with 0 apply to the idling of the machine and the characteristic curves marked with 1 to 4 apply to the increasing load on the machine. In the lower half of FIG. 6, the associated curves for the useful flow Φ N = Φ 1 + Φ 2 and the housing flow Φ G are shown proportionally Φ 12 . As he can see, the useful flow Φ N changes proportionally with the excitation flow VE. This can be controlled by the control coil 14 applied exciter flow VE the useful flow Φ N in a wide range. The case flow Φ G has the value zero at Φ 1 = Φ 2 . With reduced excitation by the control coil 14 , it runs in the positive, with increased excitation in the negative counting direction.

Fig. 7 shows a further embodiment of an electrical machine's flow control according to the invention. The control coil 22 is in this machine on the outer circumference of a rotor shaft 15 with a small radial distance 16 surrounding inner collar 17 arranged laterally on the bearing plate 18 . However, an increased magnetic resistance for the housing flux Φ G Φ 12 must be accepted. It can also, as indicated by dashed lines, be arranged on both end faces against control coils 22 which are flooded with each other and which are each only penetrated by half the housing flux Φ G.

Another embodiment of a machine according to the invention is shown in FIG. 8. In this machine, the stan 13 and the runner 11 are each divided into three stand sections 13 a, 13 b, 13 c and three runner sections 11 a, 11 b, 11 c. The two outer sections 11 a and 11 c or 13 a and 13 c are each only half as wide as the middle section 11 b or 13 b. In the stator, two oppositely flooded control coils 22 are arranged between the corresponding stator sections 13 a and 13 b or 13 b and 13 c.

By means of double-sided excitation in the opposite direction, disruptive unipolar fluxes and shaft voltages at the bearing points are avoided and the flux Φ G to be guided through the stator housing and the rotor shaft 15 is halved. Correspondingly reduced passage cross sections are possible with the axial flow paths in the stator and rotor.

In addition to the arrangements already explained, each with only a single or a group of magnetically connected block or shell magnets per pole pair, arrangements are also possible which each have different magnetic characteristics for the poles of the same name. This applies to the embodiments of runners 11 shown in FIGS. 9 and 10. In the rotor embodiment shown in FIG. 9, the north poles N are for example of the rotor 11 forming the permanent magnets 12 in the radial direction thereof substantially thicker, for example. B. about 3 to 4 times as thick as the permanent magnets 19 forming the south poles S executed. This results in different magnetic characteristics. Different magnetic materials or magnets with different properties can also be used. The same effect results if sections 11 a and 11 b of magnetized additional magnets 20 are inserted between the rotor sections.

In Fig. 11, the dependence of the magnetic fluxes from the excitation flux VE for the magnet arrangements shown in FIGS. 9 and 10 is plotted. Φ 1 gives the flow through the permanent magnets 12 and Φ 2 the flow through the weaker permanent magnets 19 and the one or more magnets 20 depending on the excitation flux VE when the machine is idling again. Φ N is again the useful flow, which corresponds to the sum of Φ 1 + Φ 2 . With increasing excitation flow VE, the stronger permanent magnets 12 are increasingly demagnetized, while the weaker magnets 19 , 20 are magnetized.

Instead of axially magnetized additional magnets 20 in the rotor 11 or in addition to these, corresponding magnets can also be arranged in the axial direction between the stator sections 13 a and 13 b or also radially on the outer circumference of the stator core assemblies between them and the stator housing.

A reduction in the field distortion due to the transverse component of the armature flooding can be achieved by appropriate design of the pole system with increased magnetic resistance in the transverse direction. Such an increase in the magnetic resistance in the transverse direction is possible through slots 21 extending in the direction of the main flow or a corresponding laminating of the rotor core. Rotor cores laminated in parallel for two or four-pole machines are particularly easy to implement.

A corresponding embodiment is shown in FIGS. 12 to 15 for a two-pole machine with a rotor divided into two rotor sections 11 a and 11 b.

Figs. 16 to 18 show a corresponding execution example for a four pole machine. Here, the lamination of the two rotor sections 11 a and 11 b offset by 90 °, wherein between the two rotor sections 11 a and 11 b have an axially magnetized auxiliary magnet 20 is inserted. As can be seen from the flow paths Φ drawn in, the main flow in a four-pole machine modified in this way runs partly across the slot planes.

The slots 21 can be filled with electrically highly conductive material in order to achieve the effect of a damper cage. The iron sheets of the rotor core can also be coated with aluminum or copper.

Claims (13)

1. Electrical machine with a stand and a permanent magnet-equipped rotor, the poles of the same name (N, S) have different mounting with permanent magnets ( 12 ), characterized in that in the stand ( 13 ) coaxial to the rotor axis at least one of the magnetic fluxes (Φ 1 or Φ 2 ) of the poles of the same name (N, S) influencing the annular control coil ( 14 ) is arranged and for the differential flow (Φ 12 ) penetrating this control coil ( 14 ) both in the stator ( 13 ) and in Runner ( 11 ) axially directed flow paths are provided.
2. Electrical machine according to claim 1, characterized in that on at least one of the end plates made of ferromagnetic material ( 18 ) of the machine extend axially into the interior of the machine, the inner collar ( 17 ) at a small radial distance ( 16 ) to the shaft the rotor ( 11 ) is provided and the control coil ( 14 ) is arranged on the outer circumference of the inner collar ( 17 ).
3. Electrical machine according to claim 2, characterized in that control coils ( 22 ) which are arranged symmetrically to one another and are flooded in opposite directions are provided on both end shields.
4. Electrical machine according to claim 1, in which the rotor ( 11 ) is divided into at least two axially spaced rotor sections ( 11 a, 11 b) and which has a different equation with permanent magnets ( 12 ) having opposite poles (N, S ) each rotor section ( 11 a and 11 b) are geometrically offset from one another by a pole pitch with respect to the adjacent rotor section, as characterized in that the stator ( 13 ) has a number of axially corresponding to the number of rotor sections ( 11 a and 11 b) spaced apart stand sections ( 13 a and 13 b) is divided and control coils ( 14 ) are arranged in the spaces between the stand sections ( 13 a and 13 b).
5. Electrical machine according to claim 4, characterized in that the stator ( 13 ) and the rotor ( 11 ) divided into an odd number of sections ( 11 a to 11 c or 13 a to 13 c) and the two outer sections ( 11 a, 11 c and 13 a, 13 c) are each half as wide as the section or sections between them ( 11 b and 13 b) and that in each space between the stator sections ( 13 a to 13 c) a control coil ( 14 ) is arranged and the control coils ( 14 ) are alternately flooded in opposite directions.
6. Electrical machine according to one or more of the preceding claims 1 to 5, characterized in that each of the poles of the same name (N or S) is only equipped with permanent magnets ( 12 ).
7. Electrical machine according to one or more of the preceding claims 1 to 5, characterized in that poles of the same name (N or S) with permanent magnets ( 12 or 19 ) are equipped with different magnetic properties.
8. Electrical machine according to claim 4 or 5, characterized in that between the rotor sections ten ( 11 a, 11 b) and / or the stator sections ( 13 a, 13 b) axially magnetized additional magnets ( 20 ) is inserted.
9. Electrical machine according to one or more of the above going claims 1 to 8, characterized records that between the outer circumference of the stand laminated core and the stator housing radially magnetized Additional magnets are arranged.  
10. Electrical machine according to one or more of the above going claims 1 to 9, characterized records that the rotor poles in the transverse direction have increased magnetic resistance.
11. Electrical machine according to claim 10, characterized in that the rotor poles have slots ( 21 ) extending in the direction of the main flow.
12. Electrical machine according to claim 10, characterized characterized that the rotor poles laminated Have rotor cores in which between the individual sheets non-magnetic layers are arranged.
13. Electrical machine according to claim 12, characterized characterized in that the non-magnetic layers consist of electrically good conductive material.
DE19914115887 1990-05-28 1991-05-15 Permanent magnet rotor dynamoelectric machine - has rotor-coaxial stator coil with axial flux paths in rotor and stator Withdrawn DE4115887A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP90110080 1990-05-28

Publications (1)

Publication Number Publication Date
DE4115887A1 true DE4115887A1 (en) 1991-12-05

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Family Applications (1)

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DE19914115887 Withdrawn DE4115887A1 (en) 1990-05-28 1991-05-15 Permanent magnet rotor dynamoelectric machine - has rotor-coaxial stator coil with axial flux paths in rotor and stator

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048502A1 (en) * 1997-04-23 1998-10-29 Centre National De La Recherche Scientifique (C.N.R.S.) Improved electrical machine with double excitation
EP0905858A1 (en) * 1997-09-26 1999-03-31 Fujitsu General Limited Permanent magnet rotor type electric motor
EP1037365A1 (en) * 1999-03-12 2000-09-20 Isuzu Ceramics Research Institute Co., Ltd. Motor generator developing high torque
US7755243B2 (en) 2006-08-08 2010-07-13 Toyota Jidosha Kabushiki Kaisha Rotating electric machine
US20130221789A1 (en) * 2010-09-17 2013-08-29 Hoganas Ab (Publ) Rotor for modulated pole machine
EP2615730A3 (en) * 2012-01-13 2017-08-09 Hamilton Sundstrand Corporation Brushless starter-generator assembly and method to control magnetic flux excitation
WO2018095903A1 (en) * 2016-11-25 2018-05-31 Emf 97 Elektro-Maschinen-Vertrieb-Magnettechnik- Und Forschungs-Gmbh Synchronous machine having magnetic rotary field reduction and flux concentration
EP3334012A1 (en) * 2016-12-07 2018-06-13 Wilo Se Permanent magnet rotor for an electric machine

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048502A1 (en) * 1997-04-23 1998-10-29 Centre National De La Recherche Scientifique (C.N.R.S.) Improved electrical machine with double excitation
FR2762722A1 (en) * 1997-04-23 1998-10-30 Centre Nat Rech Scient Improved double excitation electric machine
US6229239B1 (en) 1997-04-23 2001-05-08 Centre National De La Recherche Scientifique (C.N.R.S) Electrical machine with double excitation
EP0905858A1 (en) * 1997-09-26 1999-03-31 Fujitsu General Limited Permanent magnet rotor type electric motor
EP1037365A1 (en) * 1999-03-12 2000-09-20 Isuzu Ceramics Research Institute Co., Ltd. Motor generator developing high torque
US7755243B2 (en) 2006-08-08 2010-07-13 Toyota Jidosha Kabushiki Kaisha Rotating electric machine
DE102007000429B4 (en) * 2006-08-08 2013-04-18 Nagoya Institute Of Technology Rotating electrical machine
US20130221789A1 (en) * 2010-09-17 2013-08-29 Hoganas Ab (Publ) Rotor for modulated pole machine
EP2615730A3 (en) * 2012-01-13 2017-08-09 Hamilton Sundstrand Corporation Brushless starter-generator assembly and method to control magnetic flux excitation
WO2018095903A1 (en) * 2016-11-25 2018-05-31 Emf 97 Elektro-Maschinen-Vertrieb-Magnettechnik- Und Forschungs-Gmbh Synchronous machine having magnetic rotary field reduction and flux concentration
CN110268610A (en) * 2016-11-25 2019-09-20 电机及电磁驱动科技有限公司 The synchronous motor with flux concentration is reduced with rotating magnetic field
US10693331B2 (en) 2016-11-25 2020-06-23 Emf 97 Elektro-Maschinen-Vertrieb-Magnettechnik-Und Forschungs-Gmbh Synchronous machine with magnetic rotating field reduction and flux concentration
EP3334012A1 (en) * 2016-12-07 2018-06-13 Wilo Se Permanent magnet rotor for an electric machine

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