DK173719B1

DK173719B1 - Electric motor

Info

Publication number: DK173719B1
Application number: DK200001064A
Authority: DK
Inventors: Kaj Boerge Hansen
Original assignee: Kirk Acoustics As
Priority date: 2000-07-07
Filing date: 2000-07-07
Publication date: 2001-07-23
Also published as: WO2002005409A1; DK200001064A; AU2001272358A1

Description

i DK 173719 B1in DK 173719 B1

ElektromotorElectric Motor

Opfindelsen angår en elektromotor og især en miniature , DC-motor. Sådanne motorer er nyttige fx i mobiltelefoner, 5 hvor en sådan motor kan have en masse, der er monteret excentrisk på motorakslen. Udover at være akustisk signaleret, eller som alternativ hertil, kan indgående opkald derved signaleres af vibrationer, der frembringes ved motorens rotation. Signalering ved hjælp af vibratio-lo ner er fortrinsvis ikke hørbar, men kan føles af en bruger, der bærer mobiltelefonen fx i en lomme.The invention relates to an electric motor and, in particular, to a miniature, DC motor. Such motors are useful, for example, in mobile phones, 5 where such an engine may have a mass mounted eccentrically on the motor shaft. In addition to being acoustically signaled, or as an alternative thereto, incoming calls may thereby be signaled by vibrations produced by the rotation of the motor. Signaling by means of vibration is preferably not audible, but can be felt by a user carrying the mobile phone, for example in a pocket.

I mobiltelefoner er de forskellige komponenters strømforbrug af stor interesse. Det er derfor vigtigt, at alle 15 komponenter har et lavt strømforbrug for den ønskede funktion. Det er således ønskeligt at have en motor, som kan anvendes som vibratormotor i mobiltelefoner, og som har et lavt strømforbrug og giver et stort moment både ved opstart og i drift. Endvidere bør motoren frembringe 20 så lidt elektrisk støj som muligt og have en lang forventet levetid. Ved motoren ifølge opfindelsen opnås disse mål.In mobile phones, the power consumption of the various components is of great interest. It is therefore important that all 15 components have a low power consumption for the desired function. Thus, it is desirable to have a motor which can be used as a vibrator motor in mobile phones, which has a low power consumption and provides a large torque both at start-up and in operation. Furthermore, the engine should produce 20 as little electrical noise as possible and have a long life expectancy. By the engine according to the invention these objectives are achieved.

DK PA 1999 00015 viser en miniature DC-motor med et 25 enkelt sæt spoler og en enkelt kommutatorbørste, der skifter strømmen fra en spole til en anden. Med et arrangement som den foreliggende opfindelse indgår der til enhver tid to spoler i strømvejen. På grund af at strømmen kun skiftes i det ene spolesæt ad gangen, vil 30 motoren ifølge opfindelsen afgive mindre elektrisk støj, og for det samme strømforbrug opnås et væsentligt større moment - eller et tilsvarende lave strømforbrug for det samme moment, og motoren kan gøres meget kompakt.DK PA 1999 00015 shows a miniature DC motor with a 25 single set of coils and a single commutator brush that switches the current from one coil to another. With an arrangement such as the present invention, two coils are included in the current path at all times. Because the current is switched only in one coil set at a time, the motor according to the invention will emit less electrical noise and for the same power consumption a significantly greater torque is achieved - or a correspondingly low power consumption for the same torque, and the motor can be made very compact.

DK 173 li ) B1 2 .......... . .......DK 173 li) B1 2 ........... .......

Opfindelsen vil blive nærmere beskrevet i det følgende under henvisning til tegningen, hvorThe invention will be described in more detail below with reference to the drawing, in which

Figur 1 er et længdesnit gennem en motor i en foretrukket 5 udførelsesform for opfindelsen, figur 2 er en skematisk tegning, der illustrerer kontakt teringen af motoren i figur 1, 10 figur 3 skematisk viser konstruktionen af spolerne i mo 4 toren i figur 1, og figur 4 skematisk viser et tværsnit gennem motoren i fi4 gur 1 og illustrerer kontakteringen af motoren.Figure 1 is a longitudinal section through a motor in a preferred embodiment of the invention; Figure 2 is a schematic drawing illustrating the contacting of the motor of Figure 1; Figure 3 is a schematic representation of the construction of the coils of the motor of Figure 1; Figure 4 schematically shows a cross-section through the motor in fi gur 1 and illustrates the contact of the motor.

1515

Figur 1 viser en motor med en stator 1. Ved denne udfø * relsesform er statoren rørformet og er dannet af blød: magnetisk materiale. Inde i den rørformedé stator 1 fih · des en fleksibel plade 2 med spoler udformet på’.....den ’ en ) 20 side. Spolerne er antydet ved 2a. Spolerne kan også væj: j udformet på begge sider af pladen 2. Alternåtivt'kan de. i også anvendes konventionelle viklede spoler. Ved enderη i af den rørformede stator 2 er der henholdsvis et først1 i leje 4 og et andet leje 4a, som modtager de modsatte e:|v* 25 der af en aksel 6 af elektrisk ledende materiale. Akslen 6 bærer en magnet 3, som er magnetiseret i retningen å:! sin diameter, dvs. på tværs af motoraksen. De to lejer · og 4a er fortrinsvis identiske og har hehhbTdsvis" et før·' ste sæt kontaktorer Cl og et andet sæt kontaktorer C2, 30 der er udformet som flade overflader vinkelret på motor· aksen og vendende indad i statoren. ’På begge sider magneten 3 har akslen 6 kontaktfjedre henholdsvis 5 ø(i 5a, som er fremstillet af en fjedrende, elektrisk ledend« metaltråd. Kontaktfjedrene 5 og 5a har en smal ende og eis DK 173719 B1 3 bredere parti med en fri ende. Kontaktfjedrene er fastgjort til akslen og elektrisk forbundet med akslen ved deres smalle ender. Hver af kontaktfjedrenes frie ender er i elektrisk kontakt med en kontaktflade på et respek-5 tivt et af lejerne. Ved lejet 4a rager akslen forbi lejet, og den udragende ende af akslen bærer en excentrisk monteret masse 7.Figure 1 shows a motor with a stator 1. In this embodiment, the stator is tubular and is made of soft: magnetic material. Inside the tubular stator 1 there is a flexible plate 2 with coils formed on the '..... side'. The coils are indicated at 2a. The coils can also weigh: j formed on both sides of the plate 2. Alternatively, they can. also conventional winding coils are used. At the end of the tubular stator 2, there is a first1 in bearing 4 and a second bearing 4a, respectively, which receive the opposite e: | v * 25 of a shaft 6 of electrically conductive material. The shaft 6 carries a magnet 3 which is magnetized in the direction of: its diameter, i.e. across the motor axis. The two bearings · and 4a are preferably identical and have preferably a first set of contactors C1 and a second set of contactors C2, which are formed as flat surfaces perpendicular to the motor axis and facing inwardly into the stator. ' magnet 3 has shaft 6 contact springs and 5 ø (5a respectively) made of a resilient, electrically conductive metal wire. Contact springs 5 and 5a have a narrow end and a wider portion with a free end. The contact springs are attached to Each of the free ends of the contact springs is in electrical contact with a contact surface of a respective one of the bearings At the bearing 4a, the shaft projects past the bearing and the protruding end of the shaft carries an eccentric mounted mass 7.

Figur 2 viser et første sæt spoler SI, S3 og S5. Hver af io spolerne SI, S3 og S5 i det første sæt har en spoletrådende, der er forbundet med en første terminal TI i motoren, og de andre spoletrådender er forbundet med hver de- ' res kontaktor Cla, Clb og Clc i det første sæt kontaktp-rer Cl, der er beliggende ved det første leje 4. Figur 2 15 viser endvidere et andet sæt spoler S2, S4 og S6. Hver af spolerne S2, S4 og S6 i det andet sæt har en spoletrådende forbundet med en anden terminal T2 i motoren, og de andre spoletrådender er forbundet med hver deres kontaktor C2a, C2b og C2c i det andet sæt kontaktorer C2, der 20 er beliggende ved det andet leje 4a. Rotoren med motorakslen 6 og kontaktfjedrene 5 og 5a er vist med en cirkel af illustrationsmæssige hensyn. Konstruktionen i figur 2 er vist "foldet ud”. I motoren er den viste konstruktion cylindrisk, og i hvert spolesæt er spolerne adskilt 120 25 grader. I hvert kontaktorsæt er de tre kontaktorer ligeledes adskilt 120 grader. Hver kontaktor strækker sig over lidt mindre end 120 grader, så at der findes en lille spalte mellem nabokontaktorer. Det første spolesæt og det første kontaktorsæt er vinkelforskudt 60 grader i 30 forhold til det andet spolesæt og det andet kontaktorsæt. 1 drift er terminalerne TI og T2 forbundet med en DC-strømkilde. I den viste stilling af motorakslen er der etableret en elektrisk strømvej fra den første terminal DK 173 Ί 5Β1 4 TI gennem spolen S5 i det første spolesæt, kontaktorje l Clc i det første kontaktorsæt, den første kontaktfjede · 5, akslen 6, den anden kontaktfjeder 5a, kontaktoren C2 i det andet kontaktorsæt, spolen S4 i det andet spolesjæ 5 og den anden terminal T2. Den elektriske strøm i spolern S5 og S4 frembringer et magnetfelt, som samvirker med rp j tormagneten 3 og bringer rotoren til at rotere. Ved rota i tion af motoren vil akslen 6 med kontaktfjedre 5, 5a vis skematisk i figur 2 bevæge sig fra den viste stilling ti 10 en stilling, hvor strømvejen opretholdes i spolen i de ene spolesæt, hvorimod strømmen i spolen i det andet spp· jj lesæt forskydes til en anden spole i det samme spolesæt ] Strømvejen omfatter således altid en spole i det ep spolesæt og en spole i det andet spolesæt, der er forbum· ij 15 det i serie, og ved rotation af rotoren sker omskiftningen af strømvejen skiftevis mellem det første spolesæt <j>< det andet spolesæt. Hver kommuteringsoperation skifter.) således kun halvdelen af strømvejen og halvdelen af spolerne, medens den anden halvdel af strømvejen og den an- j 20 den halvdel af spolerne skiftes efterfølgendeFigure 2 shows a first set of coils SI, S3 and S5. Each of the coils S1, S3 and S5 in the first set has a coil wiring connected to a first terminal T1 in the motor, and the second coil wires ends are connected to each of their contactors Cla, Clb and Clc in the first set. contact pairs C1 located at the first bed 4. Figure 2 15 further shows a second set of coils S2, S4 and S6. Each of the coils S2, S4 and S6 in the second set has a coil wiring connected to a different terminal T2 in the motor, and the other coil wires ends are each connected to their contactors C2a, C2b and C2c in the second set of contactors C2 located 20 at the second bearing 4a. The rotor with the motor shaft 6 and the contact springs 5 and 5a is shown with a circle for illustrative purposes. The structure of Figure 2 is shown as "unfolded". In the motor, the construction shown is cylindrical and in each coil set the coils are separated by 120 degrees. In each contactor set, the three contactors are also separated by 120 degrees. Each contactor extends slightly less than 120 degrees so that there is a small gap between neighboring contactors.The first coil set and the first contactor set are angularly displaced 60 degrees relative to the second coil set and the second contactor set.In operation, terminals T1 and T2 are connected to a DC power source. In the shown position of the motor shaft, an electrical current path is established from the first terminal DK 173 Ί 5Β1 4 TI through the coil S5 in the first coil set, contact line 1 Clc in the first contactor set, the first contact spring · 5, the shaft 6, the second contact spring 5a, the contactor C2 in the second contactor set, the coil S4 in the second coil saw 5 and the second terminal T2. The electric current in the coil S5 and S4 produces a magnetic field. elt, which cooperates with the rp j tor magnet 3 and causes the rotor to rotate. In rotation of the motor, shaft 6 with contact springs 5, 5a will schematically move from figure 2 to 10 in a position where the current path is maintained in the coil in one coil set, whereas the current in the coil in the other spp. read set is shifted to another coil in the same coil set] Thus, the current path always includes a coil in the ep coil set and a coil in the second coil set that is pre-arranged in series, and when rotating the rotor, the switching of the current path takes place alternately between the first coil set <j> <the second coil set. Thus, each commutation operation shifts.) Only half of the current path and half of the coils, while the other half of the current path and the other half of the coils are subsequently switched.

Figur 3 viser skematisk spolernes layout og den fleksible plade. Pladen vil være rullet og placeret inde i den rørformede stator nær dens cylindriske indre flade, hvor der 25 vil være fastholdt på plads ved hjælp af de to lejer. Dost, vil ses, at hver spole har en sideværts udstrækning svarende til 180 grader ved placering i statoren, og at spolerne er adskilt fra hinanden svarende til 60 grader.Figure 3 shows schematically the layout of the coils and the flexible plate. The plate will be rolled and placed inside the tubular stator near its cylindrical inner surface where 25 will be retained in place by the two bearings. Dost, it will be seen that each coil has a lateral extension corresponding to 180 degrees when placed in the stator and that the coils are spaced apart corresponding to 60 degrees.

30 Figur 4 viser et skematisk tværsnit gennem motoren. Den yderste konstruktion er den rullede plade med spolerne. Ligeledes vist er de to sæt kontaktorer, hvor af illustrationsmæssige hensyn det første sæt kontaktorer Cla,30 Figure 4 shows a schematic cross section through the engine. The outermost construction is the rolled plate with the coils. Also shown are the two sets of contactors, for illustrative purposes the first set of contactors Cla,

Clb og Clc er vist havende en større diameter end det an- DK 173719 B1 5 det sæt kontaktorer C2a, C2b og C2c. Ligeledes vist er en kontaktbørste Cbr, der illustrerer akslen med de to kontaktfjedre. Kontaktbørsten Cbr er vist strækkende sig t over kontaktorerne i de to sæt, i dette tilfælde kontak-5 toren Clc i det første sæt og kontaktoren C2b i det andet sæt.Clb and Clc are shown to have a larger diameter than the set of contactors C2a, C2b and C2c. Also shown is a contact brush Cbr illustrating the shaft with the two contact springs. The contact brush Cbr is shown extending t across the contactors in the two sets, in this case the contactor Clc in the first set and the contactor C2b in the second set.

Claims

An electric motor with a stator and a rotor which is rotatably received in the stator, wherein the stator has a first set of a plurality of coils of electrically conductive wire disposed in a star configuration, each coil therein. the first set has a first coil wiring connected to a first terminal of the stato io, and each coil in the first set has a second coil readily connected to each of a first set of short-stroke faces on the stator, and the rotor having an axis and a magnet that is magnet.i ··; 15, seen transversely of the axis, and a first contact brush, they: j rotate the rotating contact alternately * j of the first set of contact surfaces, alternating an electric current flow through the first contact brush alternately through the coils of the first set of coils to the first terminal, characterized in that the stator has a second set of a plurality of coils of electric; 25 conductive wires arranged in a star configuration, each coil of the second set having a first «coil wiring connected to a second terminal of stato-; clean, and each coil has a different coil wiring connected to each of a different set of contact surfaces of the stator, the rotor having a different contact brush which is electrically connected | connected to the first coil, which, at the rotor's rotation, alternately contacts the contact surfaces of the second set of contact surfaces, thereby providing an electric current path through it; The contact brush is alternately established through the coils of the second set of coils for the second terminal, and the first contact brush and the first set of contact surfaces 5 are arranged in relation to the second contact brush and the second set of contact surfaces, so that the flow path at the rotation of the rotor switches from one coil to the other in only one set of coils at a time, and such switching occurs alternately between the first set of coils and the second set of coils.

Motor according to claim 1, characterized in that the first set of contact surfaces and the second set of contact surfaces are located on opposite sides of the rotor. 15

Motor according to claim 2, characterized in that each set of contact surfaces forms a substantially flat surface perpendicular to the axis.

4. Motor according to claim 1, characterized in that the contact brushes are helical and are made of resilient, electrically conductive metal wire.

5. Motor according to claim 4, characterized in that the screw-shaped contact brush has a narrow end portion and is fixed to the rotor shaft by that portion and the rotor shaft is electrically conductive.

Motor according to claim 5, characterized in that the 30 helical contact brushes each have a wide end portion opposite the narrow end portion with a free end of the wire contacting the respective contact surfaces.