CN1941570A - Step motor - Google Patents
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- CN1941570A CN1941570A CN 200510105487 CN200510105487A CN1941570A CN 1941570 A CN1941570 A CN 1941570A CN 200510105487 CN200510105487 CN 200510105487 CN 200510105487 A CN200510105487 A CN 200510105487A CN 1941570 A CN1941570 A CN 1941570A
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Abstract
The invention is concerned with the step-by-step motor with low cost and high power, including: the cylinder magnet that divides into 4*n shares along the circle direction and magnetizes to different magnetic pole alternatively; the first loop of the cylinder and the second loop of the cylinder is concentric with the magnet, which is set at the position of keeping magnet between them along the axis direction; the first outside magnetic pole part and the second outside magnetic pole part lay at the angle position that is get by n part, which is from the bottom of the magnet and the side surface of another bottom and the magnet respectively, by the excitation of the first loop and the second loop; the rotating shaft consists of the soft magnetic material, forms inside magnetic pole part that fixes in the magnet, at least faces to the first outside magnetic pole and the second outside magnetic pole along the area of axis direction, by the excitation of the first loop and the second loop; lays the first outside magnetic pole and the second outside magnetic pole as: the position of it is excursion 135/n degree from the phase of the magnetized magnet, and the axis direction of the magnet is at least partly overlap.
Description
Technical field
The present invention relates to a kind of cylindrical shape stepper motor that can be applicable to comprise the midget plant of photographic means and mobile phone.
Background technology
Having proposed a kind of diameter around rotating shaft reduces but export the stepper motor (referring to Japanese kokai publication hei 09-331666 communique (USP 5831356)) of increase.The decomposition diagram of this stepper motor as shown in Figure 6, its axial part of this stepper motor that is under the assembled state shown in Figure 7.
In these figure, Reference numeral 201 expression cylindrical rotors, it is made up of the permanent magnet that is divided into four parts in a circumferential direction, and is become different magnetic poles by alternating magnetization; Reference numeral 202 expressions first coil, it is arranged in vertically near rotor 201 places; Reference numeral 203 expressions second coil is arranged in similarly vertically near rotor 201 places; Reference numeral 204 expressions first stator, it is made of soft magnetic material, and comes excitation by first coil 202; Reference numeral 205 expressions second stator, it is made of soft magnetic material, and comes excitation by second coil 203.
In said structure, switch the energising direction of first coil 202 and second coil 203, changing the polarity of first outside pole parts 204A and 204B and the first inboard pole parts 204C and 204D and second outside pole parts 205A and 205B and the second inboard pole parts 205C and 205D, thereby make rotor 201 rotations.
In this stepper motor, flow to the opposed inside pole parts or flow to the opposite external side pole parts from outside pole parts by the magnetic flux that coil electricity is produced, and act on the magnet that constitutes by the rotor between outside pole parts and inboard pole parts expeditiously from inboard pole parts.And, because the distance between outside pole parts and the inboard pole parts can be approximately equal to the thickness of cylinder magnet, therefore can reduce the magnetic resistance (resistance) of the magnetic circuit formed by outside pole parts and inboard pole parts.The magnetic resistance of magnetic circuit is more little, and it is just more little to be used to produce the required electric current of a lot of magnetic flux, this means bigger output.
In technical literature (referring to Japanese kokai publication hei 10-229670 communique) in the further modified version of disclosed this stepper motor, form inboard pole parts with cylindrical shape, the output shaft that inserts the inside of these inboard pole parts is made of soft magnetic material, and be installed on the stator (constituting), be used for rotatably keeping the bearing of output shaft to constitute by nonmagnetic substance by inboard pole parts and outside pole parts.Because output shaft also can be used as the part of magnetic circuit in this structure, therefore increased the output of motor.
But, in the disclosed motor of Japanese kokai publication hei 10-229670 communique, because each outside pole parts all is connected to another outside pole parts, therefore influences second coil, second outside pole parts and the second inboard pole parts by the magnetic flux that first coil electricity is produced by the output shaft that is made of soft magnetic material; Influence first coil, first outside pole parts and the first inboard pole parts by the magnetic flux that second coil electricity is produced by the output shaft that is made of soft magnetic material, this causes rotation unstable.
In Japanese kokai publication hei 09-331666 (USP 5831356) number communique and the disclosed motor of Japanese kokai publication hei 10-229670 communique, need the interval of stipulating between the internal diameter of magnet and inboard pole parts on the other side, the control to this interval in manufacture process has increased cost.In addition, as the shape of stator, need cylindrical inside pole parts and outside pole parts, their integral structure causes difficulty for the manufacturing of parts.The separation structure that is used for assembling subsequently means the increase of number of components, and this is another factor that cost is increased.
And, if first outside pole parts and second outside pole parts are approaching mutually, then can crosstalk (crosstalk), cause running accuracy and rotation output to descend.For fear of this problem, between first outside pole parts and second outside pole parts, be provided with gap T1 with respect to direction with axially parallel.In above-mentioned patent application, first outside pole parts and second outside pole parts are arranged on the outer peripheral face of rotor with the phase difference of 180/n degree, wherein n is the number of the magnetic pole that is magnetized of magnet, and first outside pole parts is pitch, is located at n/2 position with the diagonal angle with respect to the about 360/n degree of the outer peripheral face of rotor with the 720/n degree.Second outside pole parts also is pitch, is located at n/2 position with the diagonal angle with respect to the about 360/n degree of the outer peripheral face of rotor with the 720/n degree.Therefore, if be parallel to the axle direction on T1 very close to each other, then first outside pole parts and second outside pole parts will be in contact with one another.
In addition, since the appearance of gap T1 with first outside pole parts with respect to the magnet rotor axially on length be reduced to (A1-T1)/2, wherein, A1 is a magnet rotor length in the axial direction, therefore, the magnet rotor is not utilized effectively, and particularly when motor size in the axial direction reduced, output reduced.
Summary of the invention
The object of the present invention is to provide the stepper motor that a kind of cost is lower, power is higher, and do not damage its miniaturization.
To achieve these goals, stepper motor according to the present invention comprises: cylinder magnet, and it along the circumferential direction is divided into 4 * n part, and is become different magnetic poles by alternating magnetization; Cylindrical shape first coil and cylindrical shape second coil, it is concentric with described magnet, and is disposed in the position that keeps this magnet vertically between it; First outside pole parts, its bottom from described magnet is relative with the side of described magnet, is arranged in the angular position that obtains by the n five equilibrium, and comes excitation by described first coil; Second outside pole parts, its another bottom from described magnet is relative with the side of described magnet, is arranged in the angular position that obtains by the n five equilibrium, and comes excitation by described second coil; And rotating shaft, it is made of soft magnetic material, in this rotating shaft, be formed with the inboard pole parts that is fixed on described magnet inside, this rotating shaft is relative with second outside pole parts with described first outside pole parts at least in scope vertically, and comes excitation by described first coil and second coil; Wherein, described first outside pole parts and second outside pole parts are arranged as: its position is a datum offset 135/n degree with the phase place that is magnetized of described magnet, and axially overlapped at least in part about magnet.
By the detailed description of carrying out below in conjunction with accompanying drawing, above-mentioned and other purposes of the present invention, feature and advantage will be more obvious.
Description of drawings
Fig. 1 is the decomposition diagram as the stepper motor of first embodiment of the invention;
Fig. 2 is the profile that is in the stepper motor shown in Figure 1 of complete assembled state;
Fig. 3 be from perpendicular to rotor the axle direction, the profile of stepper motor shown in Figure 2;
Fig. 4 A, 4B, 4C and 4D illustrate the rotary manipulation as the rotor of the stepper motor of first embodiment of the invention;
Fig. 5 is the profile as the stepper motor of second embodiment of the invention;
Fig. 6 is the decomposition diagram of traditional stepper motor; And
Fig. 7 is the profile that is in the stepper motor shown in Figure 6 of complete assembled state.
Embodiment
Describe embodiment in detail below with reference to accompanying drawing according to stepper motor of the present invention.
First embodiment
Fig. 1～Fig. 4 is the figure about first embodiment of the invention.Fig. 1 is the decomposition diagram of stepper motor, and Fig. 2 is the position BB incision from following Fig. 3, is in the profile of the stepper motor shown in Figure 1 of assembled state.Fig. 3 cuts from the position AA of top Fig. 2, from the direction perpendicular to the axle of rotor, is in the profile of the stepper motor shown in Figure 1 of assembled state.Fig. 4 is the profile that mode of operation is shown.
In these figure, Reference numeral 1 expression constitutes the cylindrical shape magnet ring of rotor.The outer peripheral face that constitutes the magnet ring 1 of this rotor is divided into 4 * n part with the circle spacing that equates, and (n is an integer; N=4 in the present embodiment, that is, the surface is divided into 16 parts), to have magnetized spot 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L, 1M, 1N, 1P and the 1Q that is become the S utmost point and the N utmost point by alternating magnetization.The outer peripheral face of magnetized spot 1A, 1C, 1E, 1G, 1I, 1K, 1M and 1P is the S utmost point, and the outer peripheral face of magnetized spot 1B, 1D, 1F, 1H, 1J, 1L, 1N and 1Q is the N utmost point.This magnet ring 1 that is made of the injection plastic magnet can easily form little and thin shape.Even assemble, can not break by being pressed into yet.Reference numeral 2 expression cylindrical shapes first coil, Reference numeral 3 expression cylindrical shapes second coil.The core of these two coils overlaps with the core of magnet ring 1, and two coils are placed side by side in the axial direction, and makes magnet ring 1 between them.These first and second coils 2 and 3 external diameter equate substantially with the external diameter of magnet ring 1.
Among second outside pole parts 9A, 9B, 9C and the 9D of first outside pole parts 8A, 8B, 8C and the 8D and the stator 9 of stator 8 each all is to be formed by recess and the tooth that extends along the direction that is parallel to axle.This structure can form pole parts in the minimized while of the diameter that makes stepper motor.If outside pole parts is by the recess that radially extends and convexes to form, then the diameter of motor can correspondingly become big, but the structure of employed in the present embodiment outside pole parts comprises recess and the tooth that extends along the direction that is parallel to axle, and this helps making the diameter of motor to minimize.
The shape of first outside pole parts 8A, 8B, 8C and the 8D of first stator 8 and second outside pole parts 9A, 9B, 9C and the 9D of second stator 9 is identical, be arranged to make top of these two groups of dentiform magnetic poles parts to face with each other them, and the position about the direction of the axle that is parallel to magnet ring is overlapped on the outer peripheral face of magnet ring.
Second outside pole parts 9A, 9B, 9C and the 9D of first outside pole parts 8A, 8B, 8C and 8D and second stator 9 are on magnet ring 1 whole length in the axial direction, and be relative with the outer peripheral face of magnet ring 1.
Now this magnet ring 1 of representing its length with A1 is compared with traditional structure (Japanese kokai publication hei 09-331666 communique (USP 5831356)).In the traditional structure that adds up to 4 * n of the magnetic pole of magnetic pole, the quantity of first outside magnetic pole is 2 * n, and relative length is (A1-T1)/2, and correspondingly whole relative length is n * (A1-T1); Whole relative length according to the present invention is bigger, is n * A1.This means according to motor of the present invention and can more effectively utilize magnet.
The scope of the angle of each dentiform magnetic pole part of first stator 8 relative and second stator 9 with magnet ring be 360/ (4 * n), i.e. 22.5 degree or littler (representing with D in the drawings) of each tooth.Because the tooth of the outside pole parts of formation first stator 8 is 33.75 degree with departing from of the center to center of the tooth of the outside pole parts that constitutes second stator 9, therefore the shape of second outside pole parts 9A, 9B, 9C and the 9D of first outside pole parts 8A, 8B, 8C and the 8D of first stator 8 and second stator 9 is identical, even the top of these two groups of dentiform magnetic pole parts toward each other, and it is arranged as on the outer peripheral face of magnet ring about the position of the direction of the axle that is parallel to magnet ring overlapped, they remain away from each other.Therefore, between first outside pole parts and second outside pole parts, can not crosstalk, thereby running accuracy or rotation output can not descend.
The rotating shaft that Reference numeral 10 expressions are made of soft magnetic material, this is fixed to the inside of magnet ring 1.In this rotating shaft 10, inboard pole parts 10A with outer diameter D 1 is formed on such position: at first outside pole parts 8A, 8B, 8C and the 8D of first stator 8 facing in the scope vertically of magnet ring 1, magnet ring 1 be sandwiched in first stator 8 first outside pole parts 8A, 8B, 8C and 8D and should inboard pole parts 10A between.Because second outside pole parts 9A, 9B, 9C and 9D are arranged so that about the position of direction along the axle that is parallel to magnet ring, therefore overlapping with first outside pole parts 8A, 8B, 8C and the 8D of first stator 8, inboard pole parts 10A is also relative with 9D with second outside pole parts 9A, 9B, 9C.
The part 10C of rotating shaft 10 is inserted into the inside of first coil 2, the part of inboard pole parts 10A in the angular range relative with 8D with first outside pole parts 8A, 8B, the 8C of first stator 8 come excitation by first coil 2, so that magnetic pole is opposite with the magnetic pole of first outside pole parts 8A, 8B, 8C and the 8D of first stator 8.Rotating shaft 10 is being circular perpendicular to the cross sectional shape on the direction of the axle of inboard pole parts 10A, as shown in Figure 3.The part 10D of rotating shaft 10 is inserted into the inside of second coil 3, the part of inboard pole parts 10A in the angular range relative with 9D with second outside pole parts 9A, 9B, the 9C of second stator 9 come excitation by second coil 3, so that magnetic pole is opposite with the magnetic pole of second outside pole parts 9A, 9B, 9C and the 9D of second stator 9.Magnet ring 1 is fixed on the rotating shaft 10 by inboard pole parts 10A.
Because the inside of magnet ring is filled up by inboard pole parts 10A, therefore the mechanical strength of magnet obtains increasing, and inboard pole parts 10A is as back metal (back metal), thereby be provided with the unit permeance of magnetic circuit higher, even and under hot environment, use this magnet, the magnetic degeneration that causes owing to demagnetization also can reduce.First stator 8 and second stator 9 are cup-shaped, can make with the recessed simple shape of outer tube part, and this feature helps making manufacturing and assembling to become easy.
The clutch shaft bearing 12 and second bearing 13 also can be made of soft magnetic material.In this case, because the magnetic resistance of magnetic circuit reduces, therefore the moment of torsion itself that is produced increases.Certainly, may produce absorption affinity between clutch shaft bearing 12 and the rotating shaft 10 or between second bearing 13 and rotating shaft 10, caused frictional force may cause loss of machine of torque or the durability of sliding surface is caused negative effect.But, be coated with lubricant by surface to clutch shaft bearing 12, rotating shaft 10 and second bearing 13, they are coated (disulphide of fluorine, graphite or molybdenum) anti-friction lacquer or lubricated coating (for example comprising the chemical Ni-plating layer of polytetrafluoroethylene (PTFE) particle or the chemical Ni-plating layer that was lubricated by teflon ), loss of machine of torque that the friction because of slidingsurface causes can be prevented or to the negative effect of the durability of sliding surface, and the output torque of motor can be increased.
First outside magnetic pole 8A, 8B, 8C and the 8D of first stator 8 are fitted among groove 14A, 14C, 14E and the 14G, and use adhesive etc. to be fixed in wherein; Second outside magnetic pole 9A, 9B, 9C and the 9D of second stator 9 are fitted among groove 14B, 14D, 14F and the 14H, and use adhesive etc. to be fixed in wherein.Groove 14A, 14C, 14E and 14G and groove 14B, 14D, 14F and 14H phase difference each other are the 135/n degree, i.e. 33.75 degree.As previously mentioned, this profile of tooth outside pole parts 9A, 9B, 9C and 9D of profile of tooth outside pole parts 8A, 8B, 8C and 8D and second stator 9 that makes the stator 8 of winning is each other with the 135/n degree, and promptly the phase differences of 33.75 degree are arranged and maintenances.
By with first stator 8 with second stator 9 is fixed to aforesaid these connecting ring 14, the first stators 8 and second stator 9 can be arranged with desired position and phase place.And connecting ring 14 is formed by nonmagnetic substance, so that magnetic circuit is cut off between first stator 8 and second stator 9, so is difficult to influence each other between each magnetic pole.
In this embodiment of the present invention, because the inside of magnet ring 1 is rotated the inboard pole parts 10A of axle 10 and fills up, therefore, the counterpart in the structure that proposed than above-mentioned Japanese kokai publication hei 09-331666 communique (USP 5831356) and Japanese kokai publication hei 10-229670 communique of the mechanical strength of magnet is big.In addition, because rotating shaft 10 is as so-called back metal, to reduce to appear at the S utmost point of magnet inside and the magnetic resistance between the N utmost point, therefore, be provided with the unit permeance of magnetic circuit higher, even and under hot environment, use this magnet, the magnetic degeneration that causes owing to demagnetization also can reduce.
And, the motor that is proposed in Japanese kokai publication hei 09-331666 communique (USP 5831356) and Japanese kokai publication hei 10-229670 communique requires such configuration: inboard pole parts is relative with the inside of magnet, and has predetermined gap between they and the magnet, in addition, when assembling, keep accurate gap between the outside of magnet and the outside pole parts.This means that precision when parts fluctuates or assembly precision is difficult to guarantee this gap when relatively poor, thereby cause high risk of failure, this will cause inboard pole parts and the contacted problem of magnet of making; Yet present embodiment only need be managed the gap of magnet outside, and this helps making assembling to become easy.In the present embodiment, the first inboard pole parts and the second inboard pole parts are made of a part, and therefore error (mutualerror) is still less compared with the situation that is made of these parts independent part mutually, and more accurate stepper motor can be provided.
In addition, according to above-mentioned Japanese kokai publication hei 09-331666 communique (USP5831356) and Japanese kokai publication hei 10-229670 communique, inboard pole parts should be configured to not contact with the part that is connected magnet and output shaft, and this requirement has hindered guarantees axially have enough length (L1 among Fig. 7) along inboard pole parts and magnet are respect to one another; And in the present embodiment, shown in the L2 among Fig. 2, guarantee that easily inboard pole parts and magnet part respect to one another has enough length vertically, and this makes and can more effectively utilize outside pole parts and magnet, thus the output of increase motor.
Further will represent that by A1 the magnet ring 1 of its length compares with traditional structure (Japanese kokai publication hei 09-331666 communique (USP 5831356)) here.Magnetic pole at magnet adds up in the traditional structure of 4 * n, and the quantity of first outside magnetic pole is 2 * n, and relative length is (A1-T1)/2, and correspondingly whole relative length is n * (A1-T1); Whole relative length according to the present invention is bigger, is n * A1.This means according to motor of the present invention and can more effectively utilize magnet, thereby increase its output.
With reference now to illustrating,, illustrate that the rotation of this stepper motor drives along Fig. 4 A～4D in the cross section of the A-A among Fig. 2.
Fig. 4 A illustrates such state: to first coil 2 and 3 energisings of second coil, become the N utmost point with outside pole parts 8A, 8B, 8C and 8D excitation with first stator 8, and outside pole parts 9A, 9B, 9C and the 9D excitation of second stator 9 become the S utmost point.In magnet 1,1A, 1C, 1E, 1G, 1I, 1K, 1M and 1P are the S utmost point, and 1B, 1D, 1F, 1H, 1J, 1L, 1N and 1Q are the N utmost point.
When in the state shown in Fig. 4 A, first coil 2 and second coil 3 being switched on, become the N utmost point and with the outside pole parts 9A of second stator 9, when 9B, 9C become the N utmost point with the 9D excitation with outside pole parts 8A, 8B, 8C and 8D excitation with first stator 8, magnet ring 1 as rotor rotates counterclockwise 11.25 degree, to enter the state shown in Fig. 4 B.Next, when the energising direction of counter-rotating to first coil 2, become the S utmost point and with the outside pole parts 9A of second stator 9, when 9B, 9C become the N utmost point with the 9D excitation with outside pole parts 8A, 8B, 8C and 8D excitation with first stator 8, magnet ring 1 as rotor further rotates counterclockwise 11.25 degree, to enter the state shown in Fig. 4 C.Then, energising direction when counter-rotating second coil 3, become the S utmost point and with the outside pole parts 9A of second stator 9, when 9B, 9C become the S utmost point with the 9D excitation with outside pole parts 8A, 8B, 8C and 8D excitation with first stator 8, magnet ring 1 as rotor further rotates counterclockwise 11.25 degree, to enter the state shown in Fig. 4 D.
Afterwards, by the energising direction of continuous counter-rotating first coil 2 and second coil 3, as magnet ring 1 each position that is complementary with optimizing phase that forwards to forward of rotor.
The technology type that is proposed with above-mentioned Japanese kokai publication hei 09-331666 communique (USP 5831356) and Japanese kokai publication hei 10-229670 communique seemingly, the described the present invention of above-mentioned first embodiment directly acts on magnet by making by the magnetic flux that coil electricity is produced, can make stepper motor have higher output, and size is significantly reduced.Therefore, the diameter of this motor need not diameter greater than the magnetic pole of stator and magnet required diameter when relative, and the length of stepper motor need not to add greater than the length of magnet the length of first coil and second coil.Therefore, therefore the size of stepper motor, by diameter and the length that significantly reduces magnet and coil, can significantly reduce the size of stepper motor by the diameter and the length decision of magnet and coil.
Here significantly reducing the diameter of magnet and coil and length may make and be difficult to the precision that keeps stepper motor required, but the precision problem of this stepper motor can form magnet, the outside pole parts and the inboard pole parts of first and second stators is arranged as respectively the simple structure relative with inner peripheral surface with the outer peripheral face of this magnet that forms with hollow circle tube solves by using with hollow circle tube.In addition, as mentioned above, reduce cost, increased output.
Second embodiment
Fig. 5 is the profile as the stepper motor of second embodiment of the invention.Represent with identical Reference numeral respectively with assembly identical among first embodiment, and omit its explanation.
In Fig. 5, Reference numeral 15 expressions first reel, first coil 2 twines around this first reel.This first reel 15 is made of non magnetic and non-conducting material, to prevent that unintentional electrical connection takes place between first coil 2 and first stator 8.This first reel 15 is fixed on first stator 8, rotatably keeps rotating shaft 10 by hole 15A, and the 12 similar functions of the clutch shaft bearing among execution and above-mentioned first embodiment.Reference numeral 16 expressions second reel, second coil 3 twines around this second reel.This second reel 16 is made of non magnetic and non-conductive material, to prevent that unintentional electrical connection takes place between second coil 3 and second stator 9.This second reel 16 is fixed on second stator 9, rotatably keeps rotating shaft 10 by hole 16A, and second bearing, the 13 similar functions among execution and above-mentioned first embodiment.
In the present embodiment, can prevent unintentional electrical connection between first coil 2 and first stator 8, simultaneously, by single parts promptly first reel 15 constitute the parts that prevent first stator 8 and rotating shaft 10 absorption, thereby obtain being easy to assemble, cost reduces and the structure of stable operation.Similarly, can prevent unintentional electrical connection between second coil 3 and second stator 9, simultaneously, by single parts promptly second reel 16 constitute the parts that prevent second stator 9 and rotating shaft 10 absorption, thereby obtain being easy to assemble, cost reduces and the structure of stable operation.
In above-described first and second embodiment of the present invention, and part that be fixed to the inner surface of magnet ring 1 relative with 8D with first outside pole parts 8A, 8B, 8C is called inboard pole parts 10A in the output shaft 10, because the magnetic flux that is produced by first coil 2 is at first outside pole parts 8A, 8B, 8C and the 8D relative with the outer peripheral face of magnet ring 1 and be fixed between the inboard pole parts 10A of rotating shaft 10 of inner surface of magnet ring 1 and pass through, therefore, this magnetic flux can useful effect in magnet ring 1.Owing to have between the inner peripheral surface of this inboard pole parts 10A that does not require at the rotating shaft 10 relative and magnet ring 1 at interval with the inner peripheral surface of magnet ring 1, therefore, compare with the structure described in the Japanese kokai publication hei 10-229670 communique with above-mentioned Japanese kokai publication hei 09-331666 communique (USP 5831356), distance between outside pole parts 8A, 8B, 8C and 8D and the inboard pole parts 10A can be shorter, therefore, can reduce magnetic resistance, increase output.
Because the magnetic flux that is produced by second coil 3 is at second outside pole parts 9A, 9B, 9C and the 9D relative with the outer peripheral face of magnet ring 1 and be fixed between the inboard pole parts 10A of rotating shaft 10 of inner surface of magnet ring 1 and pass through, therefore, this magnetic flux can useful effect in magnet ring 1.Owing to have between the inner peripheral surface of this inboard pole parts 10A that does not require at the rotating shaft 10 relative and magnet ring 1 at interval with the inner surface of magnet ring 1, therefore, compare with the structure described in the Japanese kokai publication hei 10-229670 communique with above-mentioned Japanese kokai publication hei 09-331666 communique (USP 5831356), distance between second outside pole parts 9A, 9B, 9C and 9D and the inboard pole parts 10A can be shorter, therefore, can reduce magnetic resistance, increase output.
In addition, because inboard pole parts 10A is made of single rotating shaft 10, therefore, with in above-mentioned Japanese kokai publication hei 09-331666 communique (USP 5831356) and the Japanese kokai publication hei 10-229670 communique by being connected outside pole parts with inboard pole parts or carry out integrated manufacturing and compare, make more simple and cheap.
And, because rotating shaft 10 is fixed to the inside of magnet ring 1, therefore, can make this ring firmer, more superior.
Therefore, motor can be made of less number of parts, and is easier to make.In addition, because inboard pole parts 10A can do longlyer, therefore can more effectively utilize outside pole parts 8A, 8B, 8C, 8D, 9A, 9B, 9C and 9D, and can increase the output of stepper motor.And, owing to only need the outside of management magnet ring 1 and the gap between outside pole parts 8A, 8B, 8C, 8D, 9A, 9B, 9C and the 9D, therefore be easy to assembling.And the mechanical strength of magnet ring 1 obtains increasing, because rotating shaft 10 is used as back metal, so the more difficult magnetic that is subjected to of magnet is degenerated.
And, because first coil 2 and second coil 3 are substantially equal to magnet ring 1 on diameter, and be arranged to respect to axially between them, keeping magnet ring 1, therefore can reduce the external diameter of stepper motor.
The number of magnetic poles of the magnet ring of representing with 4 * n, the profile of tooth outside pole parts of first stator is arranged on the angular position that obtains by the n five equilibrium, the profile of tooth outside pole parts of second stator is arranged on the angular position that obtains by the n five equilibrium, first outside pole parts and second outside pole parts be arranged as make their offset (135/n) degree with respect to the outer peripheral face of magnet ring, and axially overlapped at least in part about magnet.Therefore, in traditional structure (Japanese kokai publication hei 09-331666 communique (USP 5831356)), the number of magnetic poles of magnet is 4 * n, the quantity of first outside magnetic pole is 2 * n, therefore relative length is (A1-T1)/2, therefore wherein A1 is the length of magnet ring 1, and whole relative length is n * (A1-T1); By comparison, according to the present invention, whole length is bigger, i.e. n * A1.This makes motor can more effectively utilize magnet, to increase its output.Even, it is hereby ensured the performance that stepper motor is stable owing under the situation of the outside pole parts of the outside pole parts that can construct first stator discretely and second stator, also can prevent to crosstalk.
Claims (1)
1. stepper motor comprises:
Cylinder magnet, it along the circumferential direction is divided into 4 * n part, and is become different magnetic poles by alternating magnetization;
Cylindrical shape first coil and cylindrical shape second coil, it is concentric with described magnet, and is disposed in the position that keeps this magnet vertically between it;
First outside pole parts, its bottom from described magnet is relative with the side of described magnet, is arranged in the angular position that obtains by the n five equilibrium, and comes excitation by described first coil;
Second outside pole parts, its another bottom from described magnet is relative with the side of described magnet, is arranged in the angular position that obtains by the n five equilibrium, and comes excitation by described second coil; And
Rotating shaft, it is made of soft magnetic material, in this rotating shaft, be formed with the inboard pole parts that is fixed on described magnet inside, this rotating shaft is relative with second outside pole parts with described first outside pole parts at least in scope vertically, and comes excitation by described first coil and second coil;
Described first outside pole parts and second outside pole parts are arranged as: its position is a datum offset 135/n degree with the phase place that is magnetized of described magnet, and axially overlapped at least in part about magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510105487 CN1941570A (en) | 2005-09-28 | 2005-09-28 | Step motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510105487 CN1941570A (en) | 2005-09-28 | 2005-09-28 | Step motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1941570A true CN1941570A (en) | 2007-04-04 |
Family
ID=37959442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510105487 Pending CN1941570A (en) | 2005-09-28 | 2005-09-28 | Step motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1941570A (en) |
-
2005
- 2005-09-28 CN CN 200510105487 patent/CN1941570A/en active Pending
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