EP0265425A1 - Commutator machine - Google Patents
Commutator machineInfo
- Publication number
- EP0265425A1 EP0265425A1 EP86901805A EP86901805A EP0265425A1 EP 0265425 A1 EP0265425 A1 EP 0265425A1 EP 86901805 A EP86901805 A EP 86901805A EP 86901805 A EP86901805 A EP 86901805A EP 0265425 A1 EP0265425 A1 EP 0265425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thickness
- magnet
- armature
- field strength
- ferrite
- 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- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
- H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation
Definitions
- the invention is based on a collector machine according to the preamble of the main claim.
- a collector machine in particular such a small DC motor, is known from DE-OS 28 45 264 or from DE-PS 31 19 782.
- the variation of the different machine dimensions was limited, in particular by the demagnetization resistance of the ferrite material used, the tendency was to increase the armature diameter as a percentage with increasing motor size and to reduce the optimum magnet heights as a percentage.
- Known calculation methods for such permanently magnetically excited collector machines only allowed optimization of the manufacturing costs on the one hand and the power to weight ratio on the other hand to a limited extent.
- the main claim has the advantage that using a ferrite magnetic material that can be varied within further limits with regard to remanence and coercive field strength, a machine design has been found that allows a particularly advantageous coordination of the armature transverse field and excitation field and at a favorable price Volume utilization of the machine leads.
- the thickness of the magnets used is expediently chosen to be constant over the length or the circle segment.
- FIG. 1 shows a cross section through a collector machine according to the invention
- FIG. 2 shows a Br / J H C diagram of the permanent magnet used.
- FIG. 1 shows a cross section through a small DC motor with a yoke part 10, which together with permanent magnets 11 fixed therein forms the stator 12 of the collector machine.
- An armature 15 is seated rotatably within the stator 12, leaving an air gap 14 free, and an armature winding 17 is inserted in the slots 16 thereof.
- the armature 15 is rotatably supported on a shaft 18.
- FIG. 2 shows in the form of a diagram the dependence between remanence (Br) and coercive field strength J H C for different ferrite materials.
- a lower line 22 denotes the level of development in 1982, a middle line the level of development of single-component ferrite magnets in 1985 and an upper line the currently achievable limit for multi-component ferrite magnets.
- Another limit line 25 shows the theoretically achievable limit with a remanence B r of 465 mT.
- FIG. 3 shows the dependency of the B and J H C values of permanent magnets on additions of Al 2 O 3 of different sizes. Because of the scattering of the magnetic values, the hatched areas, the decrease in the B r value and the increase in the J H C value with increasing Al 2 O 3 addition to the ferrite powder can be clearly seen.
- the Al 2 O 3 additives are generally between 0 and 6% by weight.
- the limit field strength H G is particularly important for the design of collector machines with permanent magnet excitation; This is the field strength up to which a permanent magnet is stable.
- the values of the remanence and the limit field strength of a ferrite magnetic material can be varied within a wide range by the addition of aluminum oxide, as the curves in FIG. 2 and FIG. 3 show. Depending on whether a higher remanence or a higher limit field strength is desired, the properties of the ferrite magnetic material can be changed along the solid lines in FIG. 2 by adding aluminum oxide. The value of the remanence decreases with increasing values of the limit field strength. In the illustration according to FIG.
- the middle line 23 corresponds to the current status of a single-substance magnet
- the upper line 2k applies to a two-substance magnet.
- a two-component magnet is understood to mean a permanent magnet which is constructed along the circumference of the armature 15 from two different ferrite materials, one of which has the higher coercive field strength and the other has the higher remanence; this fact is explained in detail in the publications cited at the beginning of the prior art.
- the value of the limit field strength of the magnetic material can be increased to compensate for the smaller magnet thickness.
- the anchor diameter d A of the machine can be increased with a constant outer diameter d M. A maximum of the value from torque to engine volume can be derived from this without the effects of saturation being noticeable.
- FIG. 1 shows an embodiment of the construction of a small DC motor according to the invention. For this
- FIG. 2 shows the change in the remanence (B r ) and the coercive field strength ( J H C ) (or the limit field strength (H G )) for different ferrite magnetic materials to which different amounts of aluminum oxide have been added.
- a ferrite material according to characteristic curve 22 can be changed by adding aluminum oxide such that a B r / J H C ratio of 420 mT /
- 260 kA / m gives a ratio of, for example, 330 mT / 450 kA / m.
- Newer ferrite single-material materials behave roughly in accordance with the mean characteristic curve 23, with significantly higher remanence values being obtained with the same coercive field strength or limit field strength.
- Various special material values have already been explained with reference to FIG. 3.
- collector machines according to the invention which also applies to generators in the same way, thus achieves an advantageous coordination of the armature transverse field and excitation field and thereby a favorable volume utilization of the motor, i.e. the greatest possible performance with unchanged volume and / or weight, or a reduction in dimensions with unchanged performance.
- the phenomena of saturation are taken into account and the possibility is used to change the values of the remanence and the coercive field strength in a known manner by adding aluminum oxide in such a way that the best results in terms of excitation flux and resistance to demagnetization are achieved for the respective application.
- Iron saturation serves as an adjustment parameter in order to achieve the lowest possible power-to-weight ratio.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc Machiner (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Une machine à collecteur, en particulier un petit moteur à courant continu possédant au moins une paire d'aimants permanents (11) supportés par une section magnétique à circuit de retour (10) et fabriqués dans un matériau ferrite uniforme ou dans un matériau à plusieurs composants ayant des zones très coercitives et rémanentes le long de la périphérie d'une armature (15) en rotation à l'intérieur du support (12). En choisissant des matériaux ferrite appropriés, selon les exigences concernant la résistance du champ d'excitation ou la résistance à la démagnétisation, et par le dimensionnement proposé du diamètre de l'armature (dA), de l'épaisseur de l'aimant (DM) et de l'épaisseur de la section à circuit de retour (DR), il est possible de réaliser la conception optimale pour le moteur en cherchant à obtenir la puissance la plus grande possible pour le plus petit poids possible.A collector machine, in particular a small direct current motor having at least one pair of permanent magnets (11) supported by a magnetic section with feedback circuit (10) and manufactured in a uniform ferrite material or in a material with several components having very coercive and remanent zones along the periphery of a frame (15) rotating inside the support (12). By choosing appropriate ferrite materials, according to the requirements concerning the resistance of the excitation field or the resistance to demagnetization, and by the proposed dimensioning of the diameter of the armature (dA), of the thickness of the magnet (DM ) and the thickness of the return circuit section (DR), it is possible to achieve the optimal design for the motor by seeking to obtain the greatest possible power for the smallest possible weight.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19853523755 DE3523755A1 (en) | 1985-07-03 | 1985-07-03 | COLLECTOR MACHINE |
DE3523755 | 1985-07-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0265425A1 true EP0265425A1 (en) | 1988-05-04 |
Family
ID=6274833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86901805A Withdrawn EP0265425A1 (en) | 1985-07-03 | 1986-03-14 | Commutator machine |
Country Status (6)
Country | Link |
---|---|
US (1) | US4774426A (en) |
EP (1) | EP0265425A1 (en) |
JP (1) | JPS63500629A (en) |
KR (1) | KR880700518A (en) |
DE (1) | DE3523755A1 (en) |
WO (1) | WO1987000361A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR890015482A (en) * | 1988-03-16 | 1989-10-30 | 이종섭 | Magnetic Excitation Induction Motor |
JPH01252151A (en) * | 1988-03-30 | 1989-10-06 | Mitsubishi Electric Corp | Permanent magnet type dc machine |
JPH0757072B2 (en) * | 1989-02-13 | 1995-06-14 | 本田技研工業株式会社 | Permanent magnet rotating machine |
JPH0374164A (en) * | 1989-08-14 | 1991-03-28 | Hitachi Ltd | Motor |
US5742111A (en) * | 1996-01-18 | 1998-04-21 | Surge Power Corporation | D.C. electric motor |
DE19832157B4 (en) * | 1998-07-17 | 2008-08-21 | Nidec Motors & Actuators (Germany) Gmbh | Electric machine |
JP2001069692A (en) * | 1999-08-27 | 2001-03-16 | Matsushita Electric Ind Co Ltd | Permanent magnet filed type, small-sized direct-current motor |
JP2002247827A (en) | 2001-02-20 | 2002-08-30 | Moric Co Ltd | Dc motor |
EP1235326A3 (en) * | 2001-02-20 | 2002-10-16 | Kabushiki Kaisha Moric | Dc motor |
CA2459733C (en) * | 2001-09-07 | 2010-04-20 | Shell Canada Limited | Assembly for drilling low pressure formation |
JP2005033843A (en) * | 2003-05-15 | 2005-02-03 | Aichi Steel Works Ltd | Dc brush motor and its permanent magnet |
JP3839428B2 (en) * | 2003-06-10 | 2006-11-01 | アスモ株式会社 | DC machine |
TWI244817B (en) * | 2004-02-05 | 2005-12-01 | Chin-Kun Tsai | DC motor |
DE102008039194A1 (en) * | 2008-08-22 | 2010-02-25 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | electric motor |
CN201975875U (en) * | 2011-01-27 | 2011-09-14 | 德昌电机(深圳)有限公司 | Electric tool and magnetoelectric machine thereof |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3083310A (en) * | 1960-03-11 | 1963-03-26 | Controls Co Of America | Electric motor having a permanent magnet stator |
FR1369107A (en) * | 1963-09-06 | 1964-08-07 | Philips Nv | Improvements to magnetic circuits, in particular for electric motors |
IT971563B (en) * | 1972-12-05 | 1974-05-10 | S O L E Spa Soc Opitergina Lav | PERMANENT MAGNET MOTOR IN PARTICULAR FOR WASHING MACHINES AND RELATED MANUFACTURING METHOD |
DE2550416A1 (en) * | 1975-11-10 | 1977-05-12 | Siemens Ag | Permanent magnetic excited DC machine stator - has ferrite magnet and flux concentrating inserts for pole faces to form pole arcs |
US4082968A (en) * | 1976-11-23 | 1978-04-04 | Contraves-Goerz Corporation | Speed detector for use on a dc motor |
DE2748162A1 (en) * | 1977-10-27 | 1979-05-03 | Bosch Gmbh Robert | PERMANENT MAGNETICALLY EXCITED DC SMALL MOTOR |
DE3237650A1 (en) * | 1981-10-12 | 1983-05-11 | Kabushiki Kaisha Morita Seisakusho, Kyoto | MICRO MOTOR WITH BUILT-IN COOLANT PIPES |
JPS5870060U (en) * | 1981-10-30 | 1983-05-12 | 三菱電機株式会社 | starting motor |
-
1985
- 1985-07-03 DE DE19853523755 patent/DE3523755A1/en not_active Withdrawn
-
1986
- 1986-03-14 WO PCT/DE1986/000112 patent/WO1987000361A1/en not_active Application Discontinuation
- 1986-03-14 US US07/041,105 patent/US4774426A/en not_active Expired - Fee Related
- 1986-03-14 KR KR870700162A patent/KR880700518A/en not_active Application Discontinuation
- 1986-03-14 JP JP61501714A patent/JPS63500629A/en active Pending
- 1986-03-14 EP EP86901805A patent/EP0265425A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8700361A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPS63500629A (en) | 1988-03-03 |
DE3523755A1 (en) | 1987-01-15 |
KR880700518A (en) | 1988-03-15 |
WO1987000361A1 (en) | 1987-01-15 |
US4774426A (en) | 1988-09-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0265425A1 (en) | Commutator machine | |
DE60117154T2 (en) | COMMUTATOR MOTORS WITH CONCENTRATED WINDINGS FOR EQUAL OR AC POWER OPERATION | |
AT514709B1 (en) | Pancake motor | |
DE3737603C2 (en) | ||
DE69531022T2 (en) | Rotating machine of the permanent magnetic type | |
DE69837027T2 (en) | Reluctance motor and reluctance motor for driving a compressor | |
DE3427920C2 (en) | ||
DE112006002546B4 (en) | Electric motor with asymmetric poles | |
WO2004051824A1 (en) | Electric machine, in particular brushless synchronous motor | |
DE1488353A1 (en) | Permanent magnet excited electrical machine | |
DE3607648A1 (en) | DYNAMOELECTRIC PERMANENT MAGNET RUNNING SERVOMOTOR AND METHOD FOR PRODUCING SUCH MACHINES | |
DE69914850T2 (en) | Permanent magnet motor and its rotor | |
DE3243044A1 (en) | DYNAMOELECTRIC MACHINE | |
DE10339232B4 (en) | Permanent magnet synchronous motor | |
DE2348502A1 (en) | ELECTRIC MOTOR WITH EXTENDED POLES AND NUMEROUS SHORT-CUTTED SHIELDING COILS FOR EACH POLE | |
DE1294532B (en) | Self-starting direct current micromotor | |
DE3345672C2 (en) | ||
WO2012150114A2 (en) | Electric motor | |
DE1160080B (en) | Electromagnetic system, especially for a DC motor | |
EP0070835B1 (en) | Electric machine, in particular small motor | |
EP0614262B1 (en) | Reluctance motor | |
DE2610219A1 (en) | ELECTRIC MOTOR | |
DE102007028347A1 (en) | Electric machine | |
EP0018352A1 (en) | Electric device or machine | |
DE102021211050A1 (en) | ELECTRIC MOTOR WITH VARIOUS Stacked ROTOR SEGMENTS AND METHOD OF DESIGNING SAME |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19870122 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT SE |
|
17Q | First examination report despatched |
Effective date: 19900220 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19900626 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19960501 Year of fee payment: 13 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: WIELAND, BERND Inventor name: MOHR, ADOLF |