WO2008033093A1 - Micromoteur sans bobinage (mcm) - Google Patents

Micromoteur sans bobinage (mcm) Download PDF

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Publication number
WO2008033093A1
WO2008033093A1 PCT/SG2006/000265 SG2006000265W WO2008033093A1 WO 2008033093 A1 WO2008033093 A1 WO 2008033093A1 SG 2006000265 W SG2006000265 W SG 2006000265W WO 2008033093 A1 WO2008033093 A1 WO 2008033093A1
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WO
WIPO (PCT)
Prior art keywords
wire
motor
rotor
stator
current
Prior art date
Application number
PCT/SG2006/000265
Other languages
English (en)
Inventor
Yi Min Amane Chu
Original Assignee
Yi Min Amane Chu
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
Application filed by Yi Min Amane Chu filed Critical Yi Min Amane Chu
Priority to PCT/SG2006/000265 priority Critical patent/WO2008033093A1/fr
Publication of WO2008033093A1 publication Critical patent/WO2008033093A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos

Definitions

  • MCM Micro-Coil less Motor
  • the invention relates to a motor and a hard disk drive employing the same.
  • HDDs hard-disk drives
  • the motor is characterized by a rotor and a stator, the rotor comprising at least one rotating multi-pole magnet; the stator comprising a plurality of current-carrying (CC) wires; and wherein the rotor pole to stator wire pole ratios range from 2:1 onwards.
  • CC current-carrying
  • the motor comprises of a round or ring magnet of four poles and a stator of three straight stator wires (4:3 rotor pole to stator pole ratio).
  • the motor comprises of a two-pole magnet and three straight stator wires (2:3 rotor pole to stator pole ratio).
  • the motor comprises of a four-pole rotor magnet and six-pole stator wires (4:6 rotor pole to stator pole ratio).
  • the rotor and stator can be arranged either side-by- side or on top of one another (upper/lower structure).
  • Figure 1 illustrates Amane's Law of Synchronization (ALS), upon which the invention is based.
  • FIG. 1 illustrate Fleming's Left Hand Rule (LHR).
  • Figures 3 and 4 illustrate ALS Attracting Point (AP) and Repelling Point (RP).
  • Figure 5 illustrates magnets movement according to Fleming LHR.
  • Figure 6 illustrates a situation causing an unrotatable magnet.
  • Figures 7(a) - (h) illustrate a motor according to a first embodiment of the invention.
  • Figures 8(a) - (e) illustrate a motor according to a second embodiment of the invention.
  • Figure 9(a) - (h) illustrate a motor according to a third embodiment of the invention.
  • Figure 10 illustrates a cross-sectional structure of a motor according to various embodiments of the invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
  • the invention is based on a novel principle called Amane's Law of Synchronization (ALS) and in order to fully understand the same, a few common principles namely Fleming's Left and Right Hand Rules (LHR) and (RHR), and the Right-Thumb Rule (RTR) will be revisited below:
  • ALS Amane's Law of Synchronization
  • LHR Fleming's Left Hand Rule
  • the Right-Thumb Rule describes that the magnetic field (MF) lines around a CC wire (10) forms a concentric circle around it. The direction of the magnetic field is perpendicular to the CC wire (10).
  • ALS provides that a pair of CC wires (10) with concentric magnetic fields (MF) of the same direction will synchronize each other to form a big concentric magnetic field. This consequently creates an attractive force between the two CC wires (10) and pulls them toward each other. On the other hand, if the current direction of one of the CC wires (10) changes, the two CC wires (10) will repel each other i.e. anti-synchronization.
  • the position where the best magnetic field synchronization is achieved is called the Attracting Point (AP), and is located somewhere between the magnet's north and south poles.
  • Figure 4 shows that if the magnet (20) of the same position, south on top and north below, is placed on the other side of the wire (10) , the magnetic field between the magnet and the CC wire will be the opposite and there will be no or zero synchronization (50) there between (the Repelling Point (RP). Consequently, the magnet (20) itself will in turn search for the AP, and will either flip over or move away from the CC wire (10) or even move back to the left side of the wire where its magnetic field previously synchronized with that of the CC wire (10).
  • AP Attracting Point
  • ALS describes that AP and RP are determined on the center of the magnet (between its north and south pole) with respect to the current direction in the wire).
  • Figure 5 shows that a pair of coin-shaped magnets (north pole above, and south pole below) placed above the CC wires will move in the arrow's direction (explained by RHR in ALS with respect to Fleming's LHR).
  • ALS further provides that if a coin-shaped magnet (20) is placed on the above center of a pair of CC wires with the currents flowing in an opposite direction.
  • the magnet (20) will not rotate because Fleming's LHR could not be achieved between the magnet (20) and the CC wires (10).
  • the magnet's movement will depend on the strength of the current and the exact position of the magnet - the magnet will either move up-leftward or down-rightward because it can only synchronize with only one wire.
  • a novel motor is accomplished based on ALS rule with respect to AP and RP, and is characterized by a rotor and a stator.
  • the rotor comprises of at least one multi-pole magnet and the stator comprises of at least a plurality of CC wires.
  • the magnet is in the form of a round ring, and the wires can be straight, bent etc. Every one North (N) and one South (S) are considered as two poles, and each CC wire carries a single pole.
  • the invention provides that the motor comprises of various rotor poles to stator poles ratios, and can either be of a side-to-side or an upper-lower structure.
  • a first embodiment of the invention is shown in Figure 7(a).
  • a round or ring magnet (20) of four poles (synchronizing points 1 ,2,3,4) serves as a rotor and is placed below a stator formed of three straight wires A, B, and C angled at 120° to one another. Each wire carries a current which direction flows independently from the other wires.
  • FIG. 7(b) shows the current flow direction of the stator at the initial stage.
  • ALS provides that the magnetic field produced by the current direction in wire C repels the magnet at point 4.
  • the magnetic field produced by wires A and B attracts point 1 and 2 respectively (and wire B repels at point 3). Consequently, the magnet starts to rotate clockwise.
  • Stage 2 Figure 7(c) shows that the first meeting point of the poles immediately following rotation is wire A and point 1. Current direction in wire A then changes to point outward while current directions of wires B and C remain the same.
  • Stage 3 Figure 7(d) shows the next or second meeting point of the poles at wire B or point 2. Now the repelling effect between wire C and point 4 is minimized and becomes an attraction between wire C and point 3. The current of wire B changes from pointing outward to inward.
  • Stage 4 Figure 7(e) shows wire C and point 3 now meets and the current direction of wire C changes from pointing inwards to outwards. As can be noted so far, the current direction of the wire changes whenever it meets a point.
  • Table 1 shows the rotation pattern of the current as follows:
  • Table 1 shows the pattern repeats every six stages, i.e. stage 1 is the same as stage 7, stage 8 the same as stage 2, and so forth.
  • stage 1 is the same as stage 7, stage 8 the same as stage 2, and so forth.
  • FIG. 8(a) A second embodiment of a motor and also the most preferred embodiment of the invention is shown in Figure 8(a).
  • a two-pole round- or ring-magnet (synchronizing points 1 and 2) serves as a rotor is placed below a stator formed of three straight rotor diameter (RD) length wires (wires A 1 B and C).
  • the three stator wires are arranged at an angle of 60° to one another.
  • Each wire carries its own direction individually.
  • Stage 1 Figure 8(b) shows an initial position of the rotor against the stator. A current runs at a direction from position A in wire A. ALS provides that the magnet will rotate clockwise for position 1 and 2 to achieve synchronization with the magnetic field of wire A.
  • Table 2 shows the rotation pattern of the current as follows:
  • a third embodiment of a motor of the invention is shown is Figure 9(a).
  • a rotor in the form of four-pole magnet (synchronizing points 1 ,2,3,4) is placed below a stator in the form of three bent wires (A,B,C).
  • a bent wire is considered having two poles because the current directions differ at the first and second half of the bent wire.
  • the wires are positioned at 60° to one another, and each half of a bent wire forms a straight line with a half of another wire.
  • the bending points of the wire must be as close as possible with one another for rotation stability.
  • Stage 1 Figure 9(b) shows the initial stage of the rotor position. Although there are number of ways to supply the current to the wires, only one current supply will be activated at one time for easy understanding. A current direction from Cb to Ca is applied in wire C. The rotor will rotate in clockwise direction. Stage 2: Figure 9(c) shows that after the magnet rotates, it reaches the same position as the initial stage. Current in wire C is then turned off, and current direction from Aa to Ab is turned on in wire A.
  • Stage 3 Figure 9(d) shows similarity to the previous two stages wherein two centre lines between the magnetic poles meet the bent wires. Same as previously, one of the centre lines falls between a bent wire (wire Ba and Bb). The current in the wire is then turned on in the Bb to Ba direction after current in wire A is turned off.
  • Stage 4 Figure 9(e) shows similar initial position except that the magnet pole position is different. The current in wire C is turned on after current in wire B is turned off. From this stage onwards, it is noted that the above stages repeat with opposite current directions.
  • Figure 10 shows a cross-sectional structure of a motor according to possible designs (100,200,300).
  • Known and existing motors are generally based on external-internal design structure, e.g. external rotor with internal stator
  • the present invention can be based on a side-by-side or upper/lower (100) type, and also be modified to external-internal types, e.g. external rotor with internal stator or external stator with internal rotor.
  • the inventive motor does not comprise of any winding (i.e., coilless) and therefore less copper usage. Due to less copper usage, there would be less copper loss and thus the motor will exhibit higher efficiency.
  • the coilless motor also has a physical advantage in that it could carry a relatively slimmer and lighter design compared to the known and existing motors (with motor winding). Additionally, it could also be noted that the inventive motor is brushless as well as coreless.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

Moteur caractérisé par un rotor comprenant au moins un aimant multipolaire rotatif, et un stator comprenant une pluralité de fils parcourus par un courant (CC). Le moteur ne comporte ni bobinage, ni collecteur et est destiné aux lecteurs de disques durs (HDD) ainsi qu'aux applications de type micromachines nécessitant un mécanisme de rotation léger.
PCT/SG2006/000265 2006-09-11 2006-09-11 Micromoteur sans bobinage (mcm) WO2008033093A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SG2006/000265 WO2008033093A1 (fr) 2006-09-11 2006-09-11 Micromoteur sans bobinage (mcm)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SG2006/000265 WO2008033093A1 (fr) 2006-09-11 2006-09-11 Micromoteur sans bobinage (mcm)

Publications (1)

Publication Number Publication Date
WO2008033093A1 true WO2008033093A1 (fr) 2008-03-20

Family

ID=39184043

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2006/000265 WO2008033093A1 (fr) 2006-09-11 2006-09-11 Micromoteur sans bobinage (mcm)

Country Status (1)

Country Link
WO (1) WO2008033093A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07213036A (ja) * 1994-01-20 1995-08-11 Matsushita Electric Ind Co Ltd モータ
JPH08223890A (ja) * 1995-02-07 1996-08-30 Tec Corp インナロータ型ブラシレスモータおよび電動送風機
US5637945A (en) * 1992-09-22 1997-06-10 Hitachi, Ltd. Brushless motor
JPH09322455A (ja) * 1996-05-28 1997-12-12 Japan Servo Co Ltd 集中巻固定子を有する永久磁石回転電機
JPH10126991A (ja) * 1996-10-24 1998-05-15 Hitachi Ltd 集中巻回転電機及びそれを用いた電動車両
EP0732694B1 (fr) * 1995-03-16 2001-05-16 International Business Machines Corporation Disque d'enregistrement de données et entraínement de disque intégrés
JP2001275329A (ja) * 2000-03-28 2001-10-05 Matsushita Electric Ind Co Ltd ブラシレスモータ
US6429554B1 (en) * 1999-10-11 2002-08-06 Innova Patent Gmbh Electric motor
EP0872943B1 (fr) * 1997-04-16 2006-05-31 Japan Servo Co. Ltd. Machine tornante électrodynamique à aimants permanents ayant un stator a bobinage concentré

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637945A (en) * 1992-09-22 1997-06-10 Hitachi, Ltd. Brushless motor
JPH07213036A (ja) * 1994-01-20 1995-08-11 Matsushita Electric Ind Co Ltd モータ
JPH08223890A (ja) * 1995-02-07 1996-08-30 Tec Corp インナロータ型ブラシレスモータおよび電動送風機
EP0732694B1 (fr) * 1995-03-16 2001-05-16 International Business Machines Corporation Disque d'enregistrement de données et entraínement de disque intégrés
JPH09322455A (ja) * 1996-05-28 1997-12-12 Japan Servo Co Ltd 集中巻固定子を有する永久磁石回転電機
JPH10126991A (ja) * 1996-10-24 1998-05-15 Hitachi Ltd 集中巻回転電機及びそれを用いた電動車両
EP0872943B1 (fr) * 1997-04-16 2006-05-31 Japan Servo Co. Ltd. Machine tornante électrodynamique à aimants permanents ayant un stator a bobinage concentré
US6429554B1 (en) * 1999-10-11 2002-08-06 Innova Patent Gmbh Electric motor
JP2001275329A (ja) * 2000-03-28 2001-10-05 Matsushita Electric Ind Co Ltd ブラシレスモータ

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199541, Derwent World Patents Index; Class X11, AN 1995-315790 *
DATABASE WPI Week 199645, Derwent World Patents Index; Class X27, AN 1996-449730 *
DATABASE WPI Week 199809, Derwent World Patents Index; Class V06, AN 1998-094420 *
DATABASE WPI Week 199830, Derwent World Patents Index; Class X11, AN 1998-340394 *
DATABASE WPI Week 200235, Derwent World Patents Index; Class V06, AN 2002-308711 *

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