CN1677808A - Step-by-step motor - Google Patents
Step-by-step motor Download PDFInfo
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- CN1677808A CN1677808A CNA2004100619751A CN200410061975A CN1677808A CN 1677808 A CN1677808 A CN 1677808A CN A2004100619751 A CNA2004100619751 A CN A2004100619751A CN 200410061975 A CN200410061975 A CN 200410061975A CN 1677808 A CN1677808 A CN 1677808A
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- yoke
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
- H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
- H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention provides a stepping motor capable of reducing the vibration and noise of the motor by decreasing cogging torque that is generated at motor driving, with the shape of a yoke optimized to provide excellent torque characteristics. The stepping motor comprises a cylindrical magnet where the N-pole and the S-pole are alternately magnetized in a circumferential direction. A rotor is composed of the rotating shaft of a specified length which is integrally provided with the magnet in the middle of a length, and at least one yoke for the engagement of rectangular upper and lower pole teeth on the inner peripheral surface facing the outer peripheral surface of the magnet at specified intervals. It also comprises a stator composed of a coil wound on a bobbin provided on the inner surface of the yoke, two large square magnetic poles of which the magnetic pole of the magnet is formed at an opposite angle facing each other with the center of the rotation of the magnet as a reference so that, with the upper and lower pole teeth of the yoke arranged in the circumferential direction at constant intervals, repulsion and attraction generated between each magnetic pole of the magnet and the upper and lower pole teeth of the yoke occur unevenly, and a plurality of small square magnetic poles formed in the circumferential direction between the large square magnetic poles at constant intervals.
Description
Technical field
The present invention relates to a kind of stepper motor, the shape of yoke is preferably rectangle, make the magnetic field intensity maximization, to improve drive characteristic, and the cogging torque of generation in the per minute step (ス テ ッ プ) when reducing motor driven, reduce the vibration and the noise of motor, and can critically carry out micro-stepping control.
Background technology
Usually, stepper motor (stepping motor) is under the situation of the feedback that is not used for the position of axle is detected, can rotate predetermined angle, stop with quite high accuracy, and, compare with other motors, keep quite high detent torque when stopping, thereby position maintaining bodies such as electronic circuit breaker that need not be other, rotating speed is also proportional with pulse (pulse), thus have can easy control drive characteristic.
Owing to have such characteristic, above-mentioned stepper motor is mainly used in the mechanical amount of movement of accurate control, especially can carry out numeral (digital) with pulse (pulse) and control, so also be widely used for the drive source of miniature precision electronic instrument etc.
For example, above-mentioned stepper motor is used as magnetic head (head) Position Control, the bill counter of the Position Control of elements position control, X-Y plotter (Plotter) of printing head or floppy disk (floppy disk) and various dishes, use in the accurate controlling and driving source of making various machines such as machine, electric typewriter, facsimile machine.
Fig. 1 is the cutaway view of the stepper motor of expression prior art, Fig. 2 is the perspective view as the stepper motor of prior art, as shown in the figure, stepper motor (1) is made of rotor (10) and stator (20), during coil electricity, the utmost point tooth of stator is become the N utmost point and the S utmost point by excitation, and the magnet of the rotor corresponding with it will be that the center rotates with the rotating shaft.
Promptly, above-mentioned rotor (10) is made of rotating shaft (11) and magnet (12), above-mentioned rotating shaft (11) is the spindle unit with certain-length, the supporting of the 1st cover plate (13) of (13a) that its length middle part is subjected to having parts of bearings, can be to positive direction or opposite spin, the inner face center of an end and the 2nd cover plate (14) joins and is supported.
And, above-mentioned magnet (12) is with a cylindric end that is located at above-mentioned rotating shaft (11) integratedly roughly, at its outer peripheral face N, the S utmost point at circumferencial direction by alternating magnetization, above-mentioned magnet (12) forms certain space with the coil (23) that is located at the inner peripheral surface of said stator (20), (24), and dispose relatively and constitute, thereby produces the electromagnetic force of stipulating by interacting.
Said stator (20) by the solenoid coil of reeling (23), (24), dispose up and down coaxially and the 1st, 2 yokes (21), (22) of interosculating constitute, above-mentioned the 1st yoke (21) mask within it has coil rack (25) and is wound on coil (23) on the above-mentioned coil rack (25), separating certain intervals on the relative inner face with the magnet (12) of above-mentioned rotor (10), the a plurality of upper and lower part utmost point teeth (21a), (21b) that constitute yoke alternately arrange, and are intermeshing form.
Also have, above-mentioned the 2nd yoke (22) is identical with above-mentioned the 1st yoke (21), and mask has the coil rack (26) of reeled coil (24) within it, on the relative inner face of above-mentioned magnet (12), the a plurality of upper and lower part utmost point teeth (22a), (22b) that constitute yoke alternately arrange, and are the form of engagement.
Thus, be added to after the 1st, 2 yokes (2 1), each coil (23) of (22), (24) that constitute above-mentioned stepper motor (1) go up from the outside with electric current, will produce electromagnetic force between the magnetic pole of above-mentioned coil (23), (24) and the 1st, 2 yokes (21), (22) and magnet (12), this electromagnetic force makes that the rotor (10) that is made of rotating shaft (11) and magnet (12) is that the center rotates with stator (20).
But, when above-mentioned stepper motor (1) drives, because the variation of the space magnetic flux density of generation and the distortion phenomenon of electric current between the yoke (21) of the magnet (12) of rotor (10) and stator (20), (22), will produce very big cogging torque (Cogging Torque) and reluctance torque pulsation (Reluctance Torque Ripple), vibration and noise will increase, thereby shorten life of product.
Here, above-mentioned cogging torque, be meant in the stepper motor with the magnet of permanent magnet (12) (1), relative position corresponding to rotor (10) and stator (20), magnetic resistance changes and the torque pulsation composition that produces, when this torque pulsation composition is pressed rotor (10) rotation 1 circle the number of poles of magnet (12) with the least common multiple of the utmost point number of teeth of above-mentioned yoke (21), (22) phenomenon of generation periodically.
On the other hand, the driving torque characteristic of stepper motor and cogging torque characteristic are decided by upper and lower part utmost point tooth (21a), (21b), (22a), the shape of (22b) and the magnetizing force of magnet (12) of the yoke that constitutes said stator (20) (21), (22), it is desirable to, the utmost point odontoid of preferred above-mentioned yoke (21), (22), make driving torque characteristic the best of electrode, making the cogging torque minimum simultaneously, is difficult but will satisfy above two characteristics at present fully.
With the 1st of existing stepper motor (1), 2 yokes (21), (22) relative magnet (12) is shown in Fig. 3 (a), when number of poles is 10 utmost points with 36 ° uniformly-spaced make N, the magnetic pole alternating magnetization of the S utmost point, the above-mentioned the 1st, 2 yokes (21), (22) on each, bottom utmost point tooth (21a), (21b), (22a), it is optimal that shape (22b) is made of rectangle, make proportional and magnetic force maximization that increase with area, as among Fig. 3 (b) shown in the dotted line, but can produce the very big cogging torque utmost point during owing to motor driven, so constitute by trapezoidal, shown in solid line.
Like this, the problem of existence is: owing to compare with rectangular utmost point tooth, area diminishes, thereby the magnetic force of yoke reduces motor driven torque reduction.
Summary of the invention
The present invention proposes for addressing the above problem, and its objective is provides a kind of stepper motor, and it is the shape of yoke preferably, obtaining good torque characteristics, and the cogging torque that produces when reducing motor driven, reduces the vibration and the noise of motor.
As in order to the technique device that achieves the above object, stepper motor of the present invention comprises:
By at the magnetic pole of the circumferencial direction N utmost point and the S utmost point by the cylinder-shaped magnet of alternating magnetization be provided with the rotor that the rotating shaft with certain-length of above-mentioned magnet constitutes integratedly at the length middle part;
Separate certain intervals with the outer peripheral face of above-mentioned magnet and at least more than one yoke of the rectangular upper and lower part utmost point tooth engagement on the relative inner peripheral surface by being located at it, justify the stator that the coil on the skeleton constitutes with the line that is wound on the inner face that is located at above-mentioned yoke, it is characterized in that:
The upper and lower part utmost point tooth of above-mentioned yoke uniformly-spaced disposes at circumferencial direction, the magnetic pole of above-mentioned magnet is a benchmark by the pivot with above-mentioned magnet, constitute at a plurality of little angle magnetic pole that circumferencial direction uniformly-spaced forms at 2 big angle magnetic poles that form on the relative vertical angles with between the magnetic pole of above-mentioned big angle, make generation repulsion heterogeneous and gravitation between the upper and lower part utmost point tooth of each magnetic pole of above-mentioned magnet and above-mentioned yoke.
Preferably, be P at the pole magnetization number of above-mentioned magnet, step by step (ス テ ッ プ) when the angle was X, the magnetization angle (β) of above-mentioned big angle magnetic pole was β=α+X;
The magnetization angle (α) of above-mentioned little angle magnetic pole be α=180 °-(180 °/p) * (2/p).
Preferably, be benchmark with the pivot of above-mentioned magnet, 2 big angle magnetic poles and many little angle magnetic pole be magnetized to relative with vertical angles have opposite polarity.
Preferably, the substep angle of above-mentioned rotor is 18 °, and above-mentioned magnet is divided into 10 utmost points, and the magnetization angle of 2 big angle magnetic poles that are magnetized in the above-mentioned magnet is 50.4 °, and the magnetization angle of remaining 8 the little angle magnetic poles that are magnetized in the above-mentioned magnet is 32.4 °.
According to above-mentioned the present invention, the utmost point odontoid that will be corresponding with the magnet of permanent magnet and produces the yoke of magnetic force is decided to be rectangle, so, because the driving torque of motor and the area of yoke are proportional, compare with existing motor with yoke of sine wave shape, trapezoidal shape, will produce high driving torque, thereby improve torque efficiency.
And, the magnetic pole of magnet that will be corresponding with the yoke with rectangle utmost point tooth is decided to be big angle magnetic pole with big magnetization angle and the little angle magnetic pole with little magnetization angle, make the extremely non-homogeneous magnetization of the N utmost point and S at circumferencial direction, thereby compared with the past the reducing to below half of cogging torque that produces in the per minute step when making motor driven, the vibration and the noise of motor are reduced, can critically carry out micro-stepping control, play the effect that improves the motor precision.
Description of drawings
Fig. 1 is the cutaway view of the stepper motor of expression prior art;
Fig. 2 is the perspective view of the stepper motor of expression prior art;
Fig. 3 (a) is provided in a side of the magnet uniform magnetization state diagram in the stepper motor of prior art; (b) be provided in a side of the front view of the utmost point tooth in the stepper motor of prior art;
Fig. 4 is the perspective view of expression stepper motor of the present invention;
Fig. 5 is provided in a side of the non-homogeneous magnetized state figure of the magnet in the stepper motor of the present invention;
Fig. 6 (a) is the expanded view that will be located at the upper and lower part utmost point tooth expansion of the yoke in the stepper motor of the present invention;
Fig. 6 (b) be expression yoke of the present invention magnetic force and, at the curve chart of the dependency relation of magnetic flux that produces between the existing magnet of uniform magnetization angle and the yoke and the magnetic flux that between the magnet of non-homogeneous magnetization angle and yoke, produces;
Fig. 7 is that existing magnet and the non-homogeneous magnetized magnet of the present invention of expression uniform magnetization revolves the curve chart of the variation of the cogging torque of per minute step generation when turning around at rotor;
Fig. 8 is the curve chart of expression variation of the cogging torque of generation corresponding to the substep angle changes.
Embodiment
Below the present invention will be described in more detail.
Fig. 4 is the perspective view of expression stepper motor of the present invention, and Fig. 5 is provided in a side of the magnetized state figure of the magnet in the stepper motor of the present invention.
Stepper motor of the present invention (100) as shown in Figure 4 and Figure 5 can preferably corresponding with magnet yoke shape, and driving torque is improved; Make the non-homogeneous magnetization of magnetic pole angle of magnet, thereby cogging torque is minimized, such stepper motor (100) is made of rotor (110) and stator (120).
Promptly, above-mentioned rotor (110) can be assembled in said stator (120) rotatably, as the rotary configured thing that produces rotary driving force, constitute by rotating shaft (111) and magnet (112), above-mentioned rotating shaft (111) is the spindle unit with certain-length as the pivot of above-mentioned rotor (110).
Above-mentioned rotating shaft (111) is supported on the parts of bearings (113a) at the center that is located at the 1st cover plate (113), can be to positive direction or freely rotate in the other direction, and the inner face center of an end and not shown the 2nd cover plate joins and is supported.
And, above-mentioned magnet (112) be magnetic pole (112a), (112b) at the circumferencial direction N utmost point and the S utmost point by the permanent magnet element cylindraceous of alternating magnetization, it is located at the length middle part of above-mentioned rotating shaft (111) integratedly.
Here, above-mentioned rotor (110) is a benchmark by the rotating shaft (111) with pivot, constitute with a plurality of little angle magnetic pole (112b) that uniformly-spaced forms at circumferencial direction at 2 the big angle magnetic poles (112a) that form on the relative vertical angles with between above-mentioned big angle magnetic pole (112a), make generation repulsion heterogeneous and gravitation between the upper and lower part utmost point tooth (121a), (121b), (122a), (122b) of the magnetic pole (112a) that in above-mentioned magnet (112), is magnetized, (112b) and the yoke (121) that constitutes said stator (120), (122).
And, the whole number of magnetic poles that are magnetized in above-mentioned magnet (112) are P, when the substep angle of above-mentioned rotor is X, try to achieve by following formula 1 in the magnetization angle (β) of the big angle magnetic pole (112a) that circumferencial direction is magnetized in the above-mentioned magnet (112), magnetize with the angle that obtains thus.
In addition, try to achieve by following formula 2, magnetize with the angle that obtains thus except the magnetization angle (α) of a plurality of little angle magnetic pole (112b) of remaining magnetic pole with relative 2 the big angle magnetic poles (112a) of vertical angles.
Here, preferably, with the rotating shaft of revolving a center (111) as above-mentioned rotor (110) is benchmark, magnetized with the N utmost point with any quilt in relative 2 the big angle magnetic poles (112a) of vertical angles, its the opposing party who tosses about is then magnetized with the S utmost point, make it to constitute and have opposite polarity, many little angle magnetic pole also be magnetized to relative with vertical angles has opposite polarity.
On the other hand, for making above-mentioned rotor (110) rotatably be assembled in the stator (120) of its inner face, separate certain interval and on the relative inner peripheral surface at outer peripheral face with above-mentioned magnet (112), yoke (121), (122) of at least more than one that is provided with that rectangular upper and lower part utmost point tooth (121a), (121b), (122a), (122b) be meshed, the inner face in above-mentioned yoke (121), (122) is respectively equipped with coil (123), the coil rack (125) of (124), (126) of reeling and flowing through electric current when switching on.
Here, separate certain intervals with the outer peripheral face of the magnet that constitutes by above-mentioned big angle magnetic pole (121a) and little angle magnetic pole (121b) and relative above-mentioned yoke (121), the upper and lower part utmost point tooth (121a) of (122), (121b), (122a), (122b) uniformly-spaced disposed at circumferencial direction.
Fig. 6 (a) is the expanded view that will be located at the upper and lower part utmost point tooth expansion of the yoke in the stepper motor of the present invention, as shown in the figure, above-mentioned upper and lower part utmost point tooth (121a), (121b), (122a), (122b) are rectangle, number of poles (p) at the magnet (112) of above-mentioned rotor (110) is 10, when the substep angle is 18 °, can produce maximum magnetic force with per 36 ° certain intervals.
Such upper and lower part utmost point tooth (121a), (121b), (122a), (122b) are relative with the outer peripheral face of cylinder-shaped magnet (112), front and back ends connects as one, become the cylindric of hollow, dispose up and down with being meshed and constitute yoke (121), (122).
Promptly, compare in the situation that circumferencial direction forms uniformly-spaced (w) with above-mentioned upper and lower part utmost point tooth (121a), (121b), (122a), (122b), constitute by 2 big angle magnetic poles (112a) with big magnetization angle and remaining little angle magnetic pole (112b) with little magnetization angle with the magnetic pole of above-mentioned upper and lower part utmost point tooth (121a), (121b), (122a), magnet (112) that (122b) is corresponding, constitute magnetization angle heterogeneous at circumferencial direction.
Fig. 6 (b) be expression yoke of the present invention magnetic force and, and the magnetic flux that produces between the existing magnet of uniform magnetization angle and the yoke, and the curve chart of the dependency relation of the magnetic flux that produces between the magnet of non-homogeneous magnetization angle and the yoke.
Here, existing magnet (12) number of magnetic poles is 10, each magnetic pole per 36 ° by uniform magnetization; Its number of magnetic poles that is magnetized (p) of magnetic pole of the present invention (112) is 10, and the substep angle is 18 °, and the magnetization angle (β) that goes up the big angle magnetic pole (112a) that forms at above-mentioned magnet (112) is magnetized with 50.4 ° by above-mentioned formula 1; The magnetization angle (α) of little angle magnetic pole (112b) is 32.4 ° by above-mentioned formula 2.
In this case, shown in Fig. 6 (b), in the magnet of existing uniform magnetization, summit with maximum magnetic flux is positioned at the right side of datum line (0), wherein, this datum line (0) the magnetic force of above-mentioned yoke (121), (122) and become maximum, on the right side, above-mentioned magnet (112) is subjected to the rotation influence of the gravitation of traction in the other direction.Therefore, (a) surveys to above-mentioned certain intervals, when it is scaled length 1.971nm, is value (1.97 * 10) after above-mentioned certain intervals multiply by number of poles to its all value after worthwhile, i.e. 19.71mm.
On the contrary, big angle magnetic pole (112a) and little angle magnetic pole (112b) by non-homogeneous magnetized magnet (112) in, summit with maximum magnetic flux is positioned at the right side or the left side of datum line (0), wherein, this datum line (0) the magnetic force of above-mentioned yoke (121), (122) and become maximum, on the right side, form interval heterogeneous (b), above-mentioned magnet (112) is subjected to the rotation influence of the gravitation of traction in the other direction; In the left side, form interval heterogeneous (b), above-mentioned magnet (112) is subjected to the influence to the repulsion of direction of rotation release.Therefore, be benchmark with the above-mentioned certain intervals (a) that is scaled 1.971mm, be 6.44mm to the value behind non-uniform spacing (b) all worthwhile.
Therefore, the summit with maximum magnetic flux of magnet approach more above-mentioned yoke (121), (122) magnetic force and be maximum datum line (0), the desirable structure that just has the cogging torque of the repulsive force that produces in the time of can reducing as motor driven more, so, magnet (112) the present invention after by non-homogeneous magnetization compared by the prior art of uniform magnetization with magnet (12), presents 3 times favourable value.
Fig. 7 be expression by the existing magnet of uniform magnetization with revolved the curve chart of the variation of the cogging torque that per step produces when turning around by non-homogeneous magnetized magnet of the present invention at rotor, as shown in the figure, for the magnetic pole that is divided into 10 utmost points, existing magnet (12) and yoke (21) by per 36 ° of uniform magnetizations, (22) cogging torque that produces between, measure by per 18 ° substep, torque value is 2～2.5gcm, by contrast, magnet of the present invention (112) and yoke (121) for the magnetic pole that is divided into 10 utmost points by 50.4 ° of big angle magnetic poles (112a) and 32.2 ° of little angle magnetic poles (112b) formation, (122) cogging torque that produces between, measure by per 18 ° substep, torque value is 0.5 to 1gcm.
Therefore, as being located on the rotor (110) by 2 big angle magnetic poles (112a) with 50.4 ° of magnetization angles and magnet (112) with 8 little angle magnetic poles (112b) formation of 32.2 ° of magnetization angles, can produce maximum magnetic force by rectangle constitute on, bottom utmost point tooth (121a), (121b), (122a), (122b) be located on the stator (120), the cogging torque that produces in the time of just making motor driven reduces to half, thereby reduce the generation of vibration and noise, can more critically carry out micro-stepping control on the one hand, also can improve driving torque on the other hand, improve moyor.
Fig. 8 is the change curve of the cogging torque that produces corresponding to the variation at substep angle of expression.
Promptly, with 18 ° is benchmark, with the substep angle increase of stepper motor is 1.2 times, 1.4 doubly, 1.8 doubly, 2.0 doubly, or be reduced to 0.8 times, 0.6 doubly, 0.4 doubly, 0.2 doubly, draw the magnetization angle (β) of big angle magnetic pole (112a) of above-mentioned magnet (112) and the magnetization angle (α) of little angle magnetic pole (112b), shown in following table 1, to having the magnet (112) and the yoke (121) of such difference magnetization angle, (122) cogging torque that produces between is measured, as shown in Figure 8, the substep angle is 18 °, the magnetization angle (β) of big angle magnetic pole (112a) is 50.4 °, when the magnetization angle (α) of little angle magnetic pole (112b) was 32.4 °, the cogging torque that produces during motor driven was for minimum.
Table 1
| The variation at substep angle (X) | ??0 | ??0.2X | ??0.4X | ??0.6X | ??0.8X | ??X | ??1.2X | ??1.4X | ??1.6X | ??1.8X | ??2.0X |
| The magnetization angle (α) of little angle magnetic pole | ??36.00 | ??35.28 | ??34.56 | ??33.84 | ??33.12 | ??32.40 | ??31.68 | ??30.96 | ??30.24 | ??29.52 | ??28.80 |
| The magnetization angle (β) of big angle magnetic pole | ??36.00 | ??38.88 | ??41.76 | ??44.64 | ??47.52 | ??50.40 | ??53.28 | ??56.16 | ??59.04 | ??61.92 | ??64.08 |
Though the present invention illustrates and illustrates that self-evident, in the spirit of the present invention and limit that are no more than by the decision of claim scope, those skilled in the art obviously can carry out many transformations and variation to the present invention to certain embodiments.
Claims (4)
1. a stepper motor comprises:
By at the magnetic pole of the circumferencial direction N utmost point and the S utmost point by the cylinder-shaped magnet of alternating magnetization be provided with the rotor that the rotating shaft with certain-length of described magnet constitutes integratedly at the length middle part;
By be located at separate certain intervals with the outer peripheral face of described magnet and with it rectangular upper and lower part utmost point tooth engagement on the relative inner peripheral surface at least more than one yoke and be wound on the stator that the coil on the line circle skeleton of the inner face that is located at described yoke constitutes,
It is characterized in that:
The upper and lower part utmost point tooth of described yoke uniformly-spaced disposes at circumferencial direction, the magnetic pole of described magnet is a benchmark by the pivot with described magnet, constitute at a plurality of little angle magnetic pole that circumferencial direction uniformly-spaced forms at 2 big angle magnetic poles that form on the relative vertical angles with between the magnetic pole of described big angle, make generation repulsion heterogeneous and gravitation between the upper and lower part utmost point tooth of each magnetic pole of described magnet and described yoke.
2. according to the said stepper motor of claim 1, it is characterized in that:
Pole magnetization number at described magnet is P, and when the substep angle was X, the magnetization angle (β) of described big angle magnetic pole was β=α+X;
The magnetization angle (α) of described little angle magnetic pole be α=180 °-(180 °/p) * (2/p).
3. according to the said stepper motor of claim 1, it is characterized in that:
Pivot with described magnet is a benchmark, and 2 big angle magnetic poles and many little angle magnetic pole be magnetized to relative with vertical angles have opposite polarity.
4. according to the said stepper motor of claim 1, it is characterized in that:
The substep angle of described rotor is 18 °, and described magnet is divided into 10 utmost points, and the magnetization angle of 2 big angle magnetic poles that are magnetized in the described magnet is 50.4 °, and the magnetization angle of remaining 8 the little angle magnetic poles that are magnetized in the described magnet is 32.4 °.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040022089A KR100541108B1 (en) | 2004-03-31 | 2004-03-31 | A stepping motor |
| KR22089/2004 | 2004-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1677808A true CN1677808A (en) | 2005-10-05 |
Family
ID=35050173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100619751A Pending CN1677808A (en) | 2004-03-31 | 2004-06-30 | Step-by-step motor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2005295782A (en) |
| KR (1) | KR100541108B1 (en) |
| CN (1) | CN1677808A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9537369B2 (en) | 2013-08-20 | 2017-01-03 | Sheng-Lian Lin | Motor |
| CN110864619A (en) * | 2018-08-27 | 2020-03-06 | 恩智浦有限公司 | Magnetic field sensor system and method for rotation angle measurement |
| CN114499100A (en) * | 2022-02-11 | 2022-05-13 | 湖南智力电机有限公司 | Speed-reducing stepping motor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101696710B1 (en) | 2015-01-28 | 2017-01-16 | 엘지전자 주식회사 | BLDC Motor and Cleaner having the same |
-
2004
- 2004-03-31 KR KR1020040022089A patent/KR100541108B1/en not_active IP Right Cessation
- 2004-06-21 JP JP2004182493A patent/JP2005295782A/en active Pending
- 2004-06-30 CN CNA2004100619751A patent/CN1677808A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9537369B2 (en) | 2013-08-20 | 2017-01-03 | Sheng-Lian Lin | Motor |
| CN110864619A (en) * | 2018-08-27 | 2020-03-06 | 恩智浦有限公司 | Magnetic field sensor system and method for rotation angle measurement |
| CN110864619B (en) * | 2018-08-27 | 2023-10-24 | 恩智浦有限公司 | Magnetic field sensor system and method for rotation angle measurement |
| CN114499100A (en) * | 2022-02-11 | 2022-05-13 | 湖南智力电机有限公司 | Speed-reducing stepping motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005295782A (en) | 2005-10-20 |
| KR100541108B1 (en) | 2006-01-11 |
| KR20050096645A (en) | 2005-10-06 |
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