CN1193170A - Mangetizing apparatus and method for ring-shape permanent magnet - Google Patents
Mangetizing apparatus and method for ring-shape permanent magnet Download PDFInfo
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- CN1193170A CN1193170A CN98105373A CN98105373A CN1193170A CN 1193170 A CN1193170 A CN 1193170A CN 98105373 A CN98105373 A CN 98105373A CN 98105373 A CN98105373 A CN 98105373A CN 1193170 A CN1193170 A CN 1193170A
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Abstract
The invention provides a device and method for magnetizing annular permanent magnet, by which the cogging torque of a permanent magnet can be suppressed to a small value even when the magnet is magnetized in a saturated state. A two-pole magnetizing yoke is inserted into the circular space of an annular permanent magnet blank 10 to be magnetized, and the blank 10 is set in an external magnetizing magnetic field H1 formed by a pulse- like current. The yoke 12 is formed to meet a relation W1>=W2 between the angular distance W1 of the arc 26 of an umbrella type projecting section 26 and the width W2 of the base section 18 of a salient pole 16, and the central angle of the arc 24 may be settled in the range of 70 DEG C-145 DEG C electrical angle.
Description
The present invention relates to more particularly, relate to the devices and methods therefor that magnetizes to so circular permanent magnet material as the stator of miniature motor or the circular permanent magnet of rotor use.
The means that magnetize of existing circular permanent magnet material are considered following three kinds usually.The 1st kind of magnetization method is the method that the coil that magnetizes is set in the inboard of circular permanent magnet material, shown in Fig. 4 (a), be tabular magnetic material to be curled be processed to form circular circular permanent magnet material 101 usefulness cylinder pressures (cylinder) 102 and push the toroidal that shaping between interior side rails 103 and the follower rail 104 becomes regulation.Or will form at the very start circular circular permanent magnet material 101 be pressed into same method between side rails 103 and the follower rail 104.
Then shown in Fig. 4 (b), cylinder pressure 102 further can be accepted the position of magnetizing most effectively along the periphery that the inwall of follower rail 104 is advanced to the yoke 106 that magnetizes that is wound with the coil 105 that magnetizes with circular permanent magnet material 101.Here, promote blood circulation towards electric current, add magnetic field, make ferromagnetic material 101 magnetization from the inboard of ferromagnetic material 101 to the coil 105 that magnetizes.
The ferromagnetic material 101 that has magnetized is subjected to the further promotion of cylinder pressure 102, inwall along follower rail 104 advances, shown in Fig. 4 (c), be pushed into and be arranged in the motor casing 108 of accepting platform 107, Fig. 5 is the profile along the yoke coil block 110 that magnetizes of the Y-Y line crosscut of Fig. 4 (b), the situation that Fig. 5 (a) expression 2 utmost points magnetize, the situation that Fig. 5 (b) expression 4 utmost points magnetize.Part identical among the figure is used identical symbol.Arrow among the figure is represented magnetic field H a, Hb.
The 2nd kind of magnetization method, shown in Fig. 7 (a) side view, pressing the yoke 203 that magnetizes that is wound with coil 202 on the face of tabular magnetic material 201, after magnetizing with dull and stereotyped state, curling shown in Fig. 7 (b) stereogram, it is circular to be processed to form, the circular permanent magnet of using as motor 204.Fig. 7 (c) represents so circular permanent magnet 204 embedded or press people's motor casing 205 with stereogram and with the fixing situation of adhesives.
The 3rd kind of magnetization method is the method that magnetizes from the magnetic field of annular permanent magnnet outer material side of being used to, at the arranged outside magnetized head that the tabular magnetic material is curled and is processed into the magnetic material of ring-type or does magnetic material circlewise at the very start, perhaps to hollow magnetizing in the annulus, perhaps the auxiliary yoke iron (iron core) that cylindric magnetic is constituted inserts in the annulus and magnetizes.
Fig. 8 represents the various states of relevant the 3rd kind of magnetization method, Fig. 8 (a) carries out the situation that 2 utmost points magnetize to hollow circular permanent magnet material 301, Fig. 8 (b) carries out the situation that 2 utmost points magnetize with annulus or motor casing 303 that hollow circular permanent magnet material 302 inserts the usefulness of curling, and Fig. 8 (c) inserts in the annulus of circular permanent magnet material 305 cylindric unshakable in one's determination 306 to carry out the situation that 2 utmost points magnetize.All be to magnetize by means of the effect of the external magnetic field Hc of magnetized head 307.
And Fig. 8 (d) expression is had the inclination the external magnetic field Hd of 4 utmost points when magnetizing by means of cylindric 306 pairs of circular permanent magnet materials 308 unshakable in one's determination, and Fig. 8 (e) represents to carry out the external magnetic field He of 6 utmost points when magnetizing by means of cylindric 306 pairs of circular permanent magnet materials 309 unshakable in one's determination.
Characteristic with the 1st kind of motor that magnetization method magnetizes is shown in Figure 12, Figure 13.Figure 12 magnetizes with the pulse that is applied that (volt: V) be transverse axis, (little weber: actual measured value μ Wb) is the figure that the longitudinal axis is done to the magnetic flux of the motor magnet that has magnetized to voltage.And Figure 13 be with the voltage that magnetizes (volt: V) be transverse axis, with the cogging torque of motor (Newton meter in the least: mNm) be changed to the figure that the longitudinal axis is done.Two figure relatively can be recognized, in cogging torque shows the voltage range that magnetizes of minimum value, magnetic flux (magnetized state) changes greatly with the change of the voltage that magnetizes, therefore under mass-produced situation, make on one side cogging torque keep less, for obtain stable magnetic flux so that good motor characteristic magnetize management arranged be difficult on one side.
That is, the motor of the permanent magnet that magnetizes is stablized in the saturated magnetic field of magnetizing that use produces with the voltage that magnetizes greatly, can increase for torque, to satisfy the motor rated value, but cogging torque also will increase, and therefore can not provide suitable serviceability.Again, in the zone that cogging torque diminishes, because the voltage that magnetizes is little, circular permanent magnet is in the inadequate unsaturation state of magnetization, therefore can not bring into play good motor characteristic.At Figure 13, the point of cogging torque minimum sees near 100 volts of the voltages of magnetizing, this position is judged according to Figure 12, be to be in magnetization near saturated unstable position, little by little very big influence will take place to magnetic flux density in variation in voltage, therefore, carries out the management of product, supervision is also controlled the condition that magnetizes, and it is very difficult that magnetization is limited in certain limit.
Again, example as shown in Figure 6, even the identical shaped yoke 106 that magnetizes, the characteristic that magnetizes the also difference because of the coiling state of the coil 105 that magnetizes is different, and the variation of coiling state produces because of the coil deterioration, so problem is, when using a plurality of yoke coil blocks 110 that magnetize to produce in a large number, will be managed, make the yoke coil block 110 that magnetizes not have difference each other, each assembly always is in same state.
For example at Fig. 6 (a), the coil 105 that magnetizes " twines neat ", but the situation that produces drum type " heaving in the middle of the winding " owing to reasons such as deteriorations shown in Fig. 6 (b) is arranged also, exaggerate the situation of such inscrutable uneven " the coil diameter deviation " of expression again just like Fig. 6 (c), the inhomogeneity condition of keeping the yoke coil block 110 that magnetizes may not be identical.
And the position of magnetizing of the periphery of the yoke 106 that magnetizes in Fig. 4 (b), owing to the interaction for fear of the inner surface of the periphery of the yoke 106 that magnetizes and circular permanent magnet material 101 is provided with gap d, therefore cause the radial position instability, at Fig. 5 (a) (b), the gap d 1 on right side and the gap d 2 in left side are inserted the influence of the small error of operation, thereby may not equate.And Fig. 4 (b) goes up the yoke of representing with arrow E 106 that magnetizes and estimates also to have deviation with circular permanent magnet material 101 relative position in the axial direction, and therefore supervision and the control to compression distance needs some measure.At so radial and axial two kinds of relative position deviations that produce between yoke 106 and the circular permanent magnet material 101 that magnetize the uniformity that magnetizes is had very big influence, so the setting of these positions has been managed into important problem.
And because the yoke coil block 110 that must will magnetize is disposed at the annulus inside of circular permanent magnet 101, the physical space that the yoke coil block 110 that magnetizes is occupied is restricted.Therefore, the cooling mechanism that heat that the coil 105 of magnetizing takes place is scattered is complicated, and the heating of the coil 105 that magnetizes causes the increase of coil windings resistance value, the magnetize characteristic that magnetizes of yoke 106 of obstruction, therefore become and make the decrease in efficiency that magnetizes, also make the insulation property deterioration of the coil that magnetizes simultaneously, make the main cause of magnetized head breakage.
Again, above-mentioned the 2nd kind of magnetization method magnetizes with saturation magnetic field usually, therefore can guarantee sufficient magnetic field intensity, but the big shortcoming of cogging torque is arranged usually.And, shown in Fig. 7 (c), after magnetizing, form circular and pack in the operation of motor casing with manual manipulation, and since the influence of permanent magnet magnetization (magnetic force), operation inconvenience, and decrease in efficiency influences productivity ratio.
On the other hand, with above-mentioned the 3rd magnetization method, the variation of under the hollow situation shown in Fig. 8 (a) circular permanent magnet 301 being carried out the measured value of 2 utmost points when magnetizing is represented with Mv, the Tv of Fig. 9 and Figure 10.In this case, shown in the curve M v in the graph of a relation of magnetize voltage and the magnetic flux of Fig. 9, the magnetization is minimum, even surpass the magnetic field of magnetizing of the saturation magnetic field of circular permanent magnet material 301, also do not reach the magnetization that the above-mentioned the 1st or the 2nd magnetization method produces, it is not enough to cause magnetizing on the motor characteristic.Also have, Fig. 9 is to be transverse axis with the pulse that the is applied voltage (V) that magnetizes, and is the figure that the longitudinal axis is made with the measured value with respect to the magnetic flux (μ Wb) of the motor magnet of this variation.
Figure 10 is the graph of a relation of voltage and cogging torque of magnetizing, according to this Figure 10, from expression the hollow curve Tv that carries out the situation that 2 utmost points magnetize of the circular permanent magnet material 301 of Fig. 8 (a) is recognized, use hollow magnetize means then cogging torque diminish generally.This Figure 10 is that measured value that the cogging torque (mMm) with motor produces with respect to the variation of the voltage that magnetizes (V) of transverse axis is longitudinal axis mapping.
Thereby, to these circular permanent magnet material 301 hollow means that magnetize, owing to cogging torque is suppressed in the motor specification than fractional value requiring, magnetize if be defined in saturated zone of magnetizing more than the magnetic field, then the change in voltage in the saturation magnetic field does not almost influence the intensity that magnetizes, therefore, and under mass-produced situation, comparing with above-mentioned the 1st kind of method, is that quality management especially is easy to exceedingly useful magnetization method.But, must sacrifice comparatively ideal motor characteristic when using such method.
Again, the situation of inserting cylinder iron core 306 in the annulus of circular permanent magnet material 305 shown in Fig. 8 (c) is depicted in Fig. 9 and Figure 10 with curve M c and curve Tc.Under such situation of having the inclination to magnetize, surpass the magnetic field of saturation magnetic field, can magnetize and the identical degree of above-mentioned the 2nd means.
But, as shown in the figure,, can not satisfy product standard because cogging torque also becomes very big together.Again, though cogging torque also diminishes because of the reduction voltage that magnetizes in this case, but at this magnetized area, the change of voltage makes magnetic field and cogging torque instability, therefore being difficult to manage makes magnetic flux and cogging torque be stable at particular value, and because the minimizing of magnetic flux causes the intensity decreases that magnetizes, therefore can not expected product all raisings of even motor characteristic on the whole.
Therefore, the object of the present invention is to provide a kind of magnetizer and magnetization method, insert the shape of the iron core in the annulus of circular permanent magnet material by improving above-mentioned the 3rd kind of means, employing is magnetized voltage management easily and can stably guarantee the raising of motor characteristic the saturated of intensity that effectively magnetize magnetized, and can suppress cogging torque in than fractional value.
In order to achieve the above object, main points of the present invention are, make circular ferromagnetic material form the magnetizer of the individual magnetic pole of 2n (n is the integer more than 1), by utilizing the magnetic flux that radially runs through this ferromagnetic material from the outside of described circular ferromagnetic material to carry out the excitation means of excitation, and the yoke that magnetizes that the magnetic material that is disposed at described ferromagnetic material inboard forms constitutes, the described yoke that magnetizes has 2n radially outstanding salient pole, each salient pole has base portion respectively and launches to both sides at the leading section of this base portion, along the arc protuberance that launches with the concentric circumference archwise of the inner periphery of described ferromagnetic material, the length of the string of described arc protuberance (W1) is bigger or equate with it than the width (W2) of described base portion.
Particularly, the center of maximum angle (θ) of the arc protuberance of the described yoke that magnetizes is preferably made the electrical degree that is equivalent to described magnetic pole (θ is the scopes of 70～145 degree a).
Fig. 1 is the magnetizer of circular permanent magnet of the present invention and the 1st embodiment of the unit that magnetizes in the magnetization method, (a) is plane graph, (b) is side view.
Fig. 2 is the magnetizer of circular permanent magnet of the present invention and the 2nd embodiment in the magnetization method, is the plane graph that 4 utmost points magnetize (a), (b) is the profile along the X-X line of (a).
Fig. 3 is the magnetizer of circular permanent magnet of the present invention and other examples of magnetization method, and wherein (a) is the 3rd embodiment, (b) is the 4th embodiment, (c) is the 5th embodiment, (d) is the 6th embodiment, more than is side view.
Fig. 4 is the side cut away view of the 1st kind of means of existing magnetization method, (a) is trimming, (b) is the operation that magnetizes, and (c) is the operation of motor casing of packing into.
Fig. 5 is the profile along the Y-Y line crosscut of Fig. 4 (b), (a) is the plane graph under 2 utmost points situation about magnetizing, and (b) is the plane graph under the situation about magnetizing of 4 utmost points under the same terms.
Fig. 6 represents the winding of the yoke coil that magnetizes of the 1st kind of means of existing magnetization method, (a) be to twine neat situation, (b) for the example of the middle distortion winding of heaving of explanation winding, (c) be the example of explanation coil diameter distortion winding devious.
Fig. 7 is the 2nd kind of means of existing magnetization method, (a) is the side view of pattern of operation of magnetizing, and (b) is the stereogram of operation of curling, and (c) is pack into the stereogram of operation of motor casing of expression.
Fig. 8 is the 3rd kind of means of existing magnetization method, and (a) hollow 2 utmost points magnetize, and (b) is that hollow 2 utmost points that insert the circular permanent magnet material of casing magnetize, (c) be to use 2 utmost points of having the inclination of solid cylinder to magnetize, (d) be that 4 utmost points magnetize, and (e) expression 6 utmost points magnetize, and more than are plane graph.
Fig. 9 represents the experimental result that adopts the means that magnetize in the outside magnetic field of magnetizing of the present invention, is that central angle with the arc protuberance two ends of the yoke that magnetizes is the graph of a relation of magnetic flux of the magnetize voltage and the motor magnet of parameter.
Figure 10 represents the experimental result that adopts the means that magnetize in the outside magnetic field of magnetizing of the present invention, is that the central angle with the arc protuberance two ends of the yoke that magnetizes is the graph of a relation of the magnetize voltage and the motor cogging torque of parameter.
Figure 11 represents the experimental result that adopts the means that magnetize in the outside magnetic field of magnetizing of the present invention, is to be the graph of a relation of the cogging torque of the central angle at the arc protuberance of the yoke that magnetizes two ends of parameter and motor with the voltage that magnetizes.
Figure 12 is the graph of a relation of magnetize voltage and magnetic flux of the means that magnetize of existing employing internal magnetic field.
Figure 13 is the graph of a relation of cogging torque of magnetize voltage and motor of the means that magnetize of existing employing internal magnetic field.
The variation of the 1st embodiment of Figure 14 presentation graphs 1.
According to Fig. 1 the summary of the example of the magnetizer of circular permanent magnet of the present invention and magnetization method is illustrated below.Fig. 1 inserts 2 utmost points that magnetic material the forms yoke 12 that magnetizes to be arranged at external parallel and to magnetize and carry out the plane graph of the means that magnetize that 2 utmost points magnetize in the magnetic field H 1 in the annulus of the circular permanent magnet material 10 that magnetizes of expression.
As shown in the figure, 2 utmost points magnetize, and 14 both sides have 2 salient poles 16 to yoke 12 at the center, and each salient pole 16 has common base portion 18.But also have the leading section of this base portion 18 to bilateral symmetry launch, along the arc protuberance 26 that extends with concentric circumference 22 archwises of the interior circle 20 of circular permanent magnet material 10.
Here, the inventor is conceived to the shape by means of the yoke 12 that magnetizes, the magnetic flux and the cogging torque of the ferromagnetic material after magnetizing are changed, by change magnetize yoke 12 center and arc protuberance 26 the angle of spread that two ends became, be central angle θ, carried out various experiments.
Specifically, the central angle θ that makes arc protuberance 26 is changed at the scope interval of 70～110 degree 5 degree, the scopes of 110～160 degree at interval 10 degree change magnetize each sample of yoke 12 of 2 utmost points that form, under identical condition, circular permanent magnet material 10 is magnetized, the mensuration flux change that the variation of voltage causes that magnetizes is mapped as parameter with central angle.
Total data only is illustrated on the figure can makes figure complicated, therefore the data of 4 samples that only will suitably extract are shown among Fig. 9 with a sets of curves My.With the central angle θ that the present invention relates to concentrate on the curve M c that has the inclination to magnetize of described cylindric iron core as the curve M y of parameter and the curve M v that is not in the mood for magnetizing between the zone in, all concentrate in the extremely narrow scope of representing with oblique line.
The circular permanent magnet material 10 that the above-mentioned condition of magnetizing is magnetized is used in the not shown motor that goes out, and measures the Figure 10 that the results are shown in of cogging torque.For fear of making picture complicated, the sample data that suitably extracts is represented with a sets of curves Ty.In Figure 10, staggered disorderly below 800V with each cogging torque that above-mentioned central angle θ is a parameter with respect to the relation curve Ty of the voltage that magnetizes, it is difficult holding its tendency, but expresses the certain tendency relevant with central angle θ in the zone of saturation that surpasses 800V.Therefore, be parameter with suitable magnetize voltage a, b, c, represent central angle θ (degree) with transverse axis, the result that the longitudinal axis is represented cogging torque (mNm) mapping is as shown in figure 11.
According to relevant experiment, can know understanding, as shown in figure 11, exist and magnetize independent from voltage and make the zone of the central angle θ that cogging torque reduces.According to Figure 11, this zone is central angle θ=70～145 degree, but also distinguishes, making cogging torque is the scope that the following suitable central angle θ of 0.3mNm is in θ=70～110 degree.
Also have, in Fig. 1, because the number of magnet poles of circular permanent magnet material 10 is 2 utmost points, so electrical degree 360 degree are consistent with mechanical angle 360 degree, but the number of magnet poles at circular permanent magnet material 10 is under the situation of 4 utmost points, electrical degree 360 degree are equivalent to mechanical angle 180 degree, and therefore suitable central angle θ in this case is in the scope of mechanical angle 35～72.5 degree.
Get back to Fig. 1, the width of establishing between the two ends 28 of arc protuberance 26 of the yoke 12 that magnetizes is W1, and the width of base portion 18 is W2, then has the relation of W1 〉=W2.Distinguish according to experiment, under the situation a little less than the saturated magnetic field of magnetizing of circular permanent magnet material, set W2 littler, and under the strong situation in the saturated magnetic field of magnetizing of circular permanent magnet material, set W2 to such an extent that equate it is suitable with W1 is approaching than W1.
That is, in the annulus of circular permanent magnet material 10, the central angle that insertion possesses the base portion 18 that satisfies defined terms and arc protuberance 26 and protuberance two ends 28 is 2 utmost points that the salient poles 16 of 70～145 degree the constitute yokes 12 that magnetize, can guarantee good motor characteristic with this, and in the zone of saturation of magnetizing that the magnetic field of being magnetized in the outside of easy, identical or higher with the saturation flux density of the ferromagnetic material 10 magnetic flux density excitation of voltage management that magnetizes produces, can reduce cogging torque.Recited above is situation about magnetizing about 2 utmost points, and therefore geometric central angle θ is consistent with electrical degree θ a, and under general 2n utmost point situation, θ=θ a/n.
With reference to the accompanying drawings embodiments of the invention are made specific description more.Fig. 1 is the 1st embodiment, and the situation that 2 utmost points magnetize is carried out in expression.That is Fig. 1 (a) is illustrated in as the central authorities that are magnetized the circular permanent magnet material 10 of object and inserts 2 utmost points unit 40 that magnetizes that yoke 12 constitutes that magnetizes, Fig. 1 (b) is illustrated in the excitation means 42 interior unit 40 that magnetize that are provided with that air core coil constitutes, and promoting blood circulation to coil 44 makes circular permanent magnet material 10 magnetized situations towards electric current.
When under the state of Fig. 1, magnetizing,, be provided with the magnetize direction of major axis 46 of yoke 12 of 2 utmost points consistent with the direction of the magnetic field H 1 that magnetizes according to the center that makes the unit 40 that the magnetizes requirement consistent location with the center of air core coil device 42.People know, middle body 48 at air core coil device 42, half the length areas L/2 that is equivalent to the total length L of coil 44 can access the parallel magnetic field of magnetizing uniformly, is set at this part acceptance and is magnetized by magnetize the unit 40 that magnetizes that yoke 12 constitutes of circular permanent magnet material 10 and 2 utmost points.
Also have, in the embodiment in figure 1, the base portion 18 and arc protuberance 26 angulations of the yoke 12 that magnetizes are the right angle, but this part also can form curve-like or ramped shaped shown in Figure 14 (a) and (b).
The 2nd embodiment of the magnetizer of circular permanent magnet of the present invention and magnetization method is that 4 utmost points magnetize, and as shown in Figure 2, the excitation means that magnetized head 50n, 50s constitute radially dispose along normal axis 54,56 circular permanent magnet material 52.4 utmost points magnetize yoke 58 4 salient poles 60 along with the direction setting of radially identical normal axis 54,56 unanimities of circular permanent magnet material 52, each leading section has the arc protuberance 62 identical with the 1st embodiment.
Usually, magnetize for the 2n utmost point, the yoke that magnetizes of arc protuberance that will have the 1/n central angle doubly of above-mentioned electrical degree is arranged in the circular permanent magnet material that magnetizes, and can obtain identical effect from giving magnetic field with the parallel direction of each salient pole axle.That is in 4 utmost points of Fig. 2 (a) magnetized, because n=2, the central angle of arc protuberance 62 was set in the scopes of 35～72.5 degree, and chord length W1 and the relation of the width W 2 of the base portion 68 of salient pole 66 are made the identical W1 〉=W2 of situation that magnetizes with 2 utmost points and got final product.
Therefore, 4 utmost points magnetize, and to make the major axis 72 that makes each salient pole 60 consistent with the major axis 74 of magnetized head 50n, the 50s of variant magnetic pole arranged perpendicular for yoke 58 and the unit 70 that magnetizes that circular permanent magnet material 52 constitutes, and the magnetize center 78 of yoke 58 of the center 76 that makes the space that forms between relative magnetized head 50n, the 50s simultaneously and 4 utmost points is consistent.And the unit 70 that magnetizes is as along shown in profile Fig. 2 (b) of the X-X line of Fig. 2 (a), and the direction that circular permanent magnet material 52 must be central shaft C is perpendicular to pulsed magnetic field H2, and the center line 79 of thickness t is positioned at the central authorities of pulsed magnetic field H2.
The pulsed magnetic field H2 that magnetized head 50n, 50s form to magnetized head 50s, forms the magnetic flux along each major axis 74 vertical deflection from magnetized head 50n, and circular permanent magnet material 52 is magnetized.If as the 2nd embodiment, adopt relative a pair of magnetized head 50n, the means that magnetize of 50s used, use 2 utmost points of the 1st embodiment yoke 12 that magnetizes, by means of two magnetized head 50n, 50s are disposed relatively, can not utilize air core coil device 42 to carry out 2 utmost points and magnetize.Like this, adopt the means that magnetize of magnetized head, 4 utmost points of the 2nd embodiment are magnetized expanded, form the 2n utmost point that the satisfies above-mentioned identical condition yoke that magnetizes, just can realize 2n utmost point multipole magnetization, its diagram and the detailed description omission of the same configuration of 2n magnetized head.
Fig. 3 is other embodiment about the above-mentioned unit that magnetizes, and each embodiment all can have the number of poles that magnetizes arbitrarily, the suitable outside magnetic field H n that magnetizes is set magnetizes.Member identical among the figure uses prosign.Fig. 3 (a) is the 3rd embodiment, between the outer circumference surface 83 of the interior anchor ring 81 of circular permanent magnet material 80 and the yoke 82 that magnetizes, do not stay the gap to be close to mutually, constitute the unit 84 that magnetizes, by means of this, circular permanent magnet material 80 is guaranteed the frictional fit of outer circumference surface 83 with the yoke 82 that magnetizes, and therefore, is being arranged at the outside when magnetizing in the magnetic field H n, as long as support either party of the circular permanent magnet material 80 or the yoke 82 that magnetizes, the structure of device obtains simplification.
Fig. 3 (b) is the 4th embodiment, inserts the yoke 82 that magnetizes with the state that circular permanent magnet material 80 is embedded supporting ring 85 and constitutes the unit 86 that magnetizes.And Fig. 3 (c) is the 5th embodiment, inserts the yoke 82 that magnetizes with the state that circular permanent magnet material 80 is pressed into or is adhered to motor casing 87 and constitutes the unit 88 that magnetizes.The 4th embodiment and the 5th embodiment all are not subjected to the influence of magnetic force when assembling, so assembly operation is easy, can improve operability.
Fig. 3 (d) is the 6th embodiment, shown in the figure of exaggeration, has the taper seat of the gradient in outer circumference surface 89 formation of the yoke 90 that magnetizes.Therefore, the interval between the inner surface 81 of the outer circumference surface 89 of the yoke 90 that magnetizes and the annulus of circular permanent magnet material 80 changes, and along with this variation, the magnetic field intensity that magnetizes also will change.That is bottom 91 magnetic field intensitys of the circle ring inner surface 81 of the most approaching circular permanent magnet 80 of the outer circumference surface 89 of the past more yoke 90 that magnetizes are strong more.Therefore, the axial attraction of pointing to motor interior when assembling motor works effectively, helps axial location stable of rotor.
As mentioned above, adopt the magnetizer and the magnetization method of circular permanent magnet of the present invention, in magnetizing of magnetic field magnetized in the use outside, in circular permanent magnet, insert the yoke that magnetizes of given shape, by means of this, the sort of coil cooling mechanism that magnetizes under the situation about magnetizing inside can be set, and can access the magnetization with the inner same intensity that magnetizes.Magnetize by means of saturation magnetic field zone again, can make the permissible variation of the variation in voltage that magnetizes become big, therefore magnetize management easily, can obtain the stable magnetization at magnetic flux
And be used under the situation of miniature motor, if the wall thickness of motor casing is below 1 millimeter, then behind motor casing that circular permanent magnet material is packed into, can magnetize, therefore assembling is easy, and production efficiency improves.
Also have, will adopt the circular permanent magnet of such means that magnetize to be used in motor, can reduce cogging torque and motor characteristic is reduced.And cogging torque determines by geometry, needn't consider the variation in voltage that magnetizes controlled to get final product, and therefore management can provide stay-in-grade motor easily when boosting productivity.
Claims (7)
1. magnetizer that on circular permanent magnet material, forms the circular permanent magnet of 2n magnetic pole, wherein, n is the integer more than 1 or 1, it is characterized in that, by utilizing the magnetic flux that radially runs through this ferromagnetic material from the outside of described circular ferromagnetic material to carry out the excitation means of excitation, and the yoke that magnetizes that the magnetic material that is disposed at described ferromagnetic material inboard forms constitutes, the described yoke that magnetizes has 2n radially outstanding salient pole, each salient pole has base portion respectively and launches to both sides at the leading section of this base portion, along the arc protuberance that launches with the concentric circumference archwise of the inner periphery of described ferromagnetic material, the length of the string of described arc protuberance (W1) is bigger or equate with it than the width (W2) of described base portion.
2. the magnetizer of circular permanent magnet according to claim 1 is characterized in that, the electrical degree that is equivalent to described magnetic pole is made at the center of maximum angle (θ) of the arc protuberance of the described yoke that magnetizes, and (θ is the angle in the scopes of 70～145 degree a).
3. the magnetizer of circular permanent magnet according to claim 1 is characterized in that, the electrical degree that is equivalent to described magnetic pole is made at the center of maximum angle (θ) of the arc protuberance of the described yoke that magnetizes, and (θ is the angle in the scopes of 90～110 degree a).
4. the magnetizer of circular permanent magnet according to claim 1 is characterized in that, excitation is carried out in described excitation means utilization the magnetize magnetic field identical or higher with the saturated magnetic field of magnetizing of described ferromagnetic material.
5. one kind is arranged at circular ferromagnetic material in the magnetic field of magnetizing, utilization radially runs through described ferromagnetic material from the outside magnetic flux carries out excitation, form the magnetization method of 2n magnetic pole, wherein, n is the integer more than 1 or 1, it is characterized in that, dispose 2n radially outstanding salient pole in the inboard of described ferromagnetic material, the yoke that magnetizes that magnetic material forms carries out excitation, described each salient pole of the described yoke that magnetizes possesses base portion respectively and launches to both sides at the leading section of this base portion, along the arc protuberance that launches with the concentric circumference archwise of the inner periphery of described ferromagnetic material, and the length of the string of described arc protuberance (W1) is bigger or equate with it than the width (W2) of described base portion.
6. the magnetization method of circular permanent magnet according to claim 5 is characterized in that, the electrical degree that is equivalent to described magnetic pole is made at the center of maximum angle (θ) of the arc protuberance of the described yoke that magnetizes, and (θ is the angle in the scopes of 70～145 degree a).
7. the magnetization method of circular permanent magnet according to claim 5 is characterized in that, utilizes the magnetize magnetic field identical or higher with the saturated magnetic field of magnetizing of described ferromagnetic material to carry out excitation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6199697A JPH10248216A (en) | 1997-02-28 | 1997-02-28 | Device and method for magnetizing annular permanent magnet |
| JP061996/97 | 1997-02-28 | ||
| JP061996/1997 | 1997-02-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1193170A true CN1193170A (en) | 1998-09-16 |
| CN1125474C CN1125474C (en) | 2003-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98105373 Expired - Fee Related CN1125474C (en) | 1997-02-28 | 1998-02-26 | Mangetizing apparatus and method for ring-shape permanent magnet |
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| Country | Link |
|---|---|
| JP (1) | JPH10248216A (en) |
| CN (1) | CN1125474C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888162A (en) * | 2009-05-14 | 2010-11-17 | 东京零件工业股份有限公司 | Miniature motor |
| CN104733150A (en) * | 2013-12-24 | 2015-06-24 | 天津三环乐喜新材料有限公司 | Magnetic-flux measurement coil of quadrupole radially-magnetized ring magnet and manufacturing method of magnetic-flux measurement coil |
| CN104269239B (en) * | 2014-08-27 | 2016-09-14 | 镇江宝纳电磁新材料有限公司 | A kind of flakey soft magnetic metal micropowder aligning device |
| CN106710784A (en) * | 2016-12-30 | 2017-05-24 | 上海三环磁性材料有限公司 | Radial two-pole magnetizing fixture |
| CN107994697A (en) * | 2016-10-27 | 2018-05-04 | 苏州宝时得电动工具有限公司 | Rotor, motor and rotor manufacture method |
| CN115662730A (en) * | 2022-11-11 | 2023-01-31 | 广东光速动力设备制造有限公司 | Single-peak multi-pole magnetizing method in ring and hub motor rotor |
| CN116134712B (en) * | 2021-03-29 | 2024-02-13 | 三菱电机株式会社 | Magnetizing device |
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| JP2006340430A (en) * | 2005-05-31 | 2006-12-14 | Matsushita Electric Ind Co Ltd | Device and method for magnetizing brushless motor |
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-
1997
- 1997-02-28 JP JP6199697A patent/JPH10248216A/en active Pending
-
1998
- 1998-02-26 CN CN 98105373 patent/CN1125474C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888162A (en) * | 2009-05-14 | 2010-11-17 | 东京零件工业股份有限公司 | Miniature motor |
| CN101888162B (en) * | 2009-05-14 | 2014-03-12 | 东京零件工业股份有限公司 | Compact motor |
| CN104733150A (en) * | 2013-12-24 | 2015-06-24 | 天津三环乐喜新材料有限公司 | Magnetic-flux measurement coil of quadrupole radially-magnetized ring magnet and manufacturing method of magnetic-flux measurement coil |
| CN104733150B (en) * | 2013-12-24 | 2017-12-29 | 天津三环乐喜新材料有限公司 | A kind of quadrupole radiation magnetizes the magnetic-flux measurement coil and preparation method thereof of toroidal magnet |
| CN104269239B (en) * | 2014-08-27 | 2016-09-14 | 镇江宝纳电磁新材料有限公司 | A kind of flakey soft magnetic metal micropowder aligning device |
| CN107994697A (en) * | 2016-10-27 | 2018-05-04 | 苏州宝时得电动工具有限公司 | Rotor, motor and rotor manufacture method |
| CN106710784A (en) * | 2016-12-30 | 2017-05-24 | 上海三环磁性材料有限公司 | Radial two-pole magnetizing fixture |
| CN106710784B (en) * | 2016-12-30 | 2018-12-18 | 上海三环磁性材料有限公司 | A kind of radial direction the two poles of the earth magnetizing clamp |
| CN116134712B (en) * | 2021-03-29 | 2024-02-13 | 三菱电机株式会社 | Magnetizing device |
| CN115662730A (en) * | 2022-11-11 | 2023-01-31 | 广东光速动力设备制造有限公司 | Single-peak multi-pole magnetizing method in ring and hub motor rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10248216A (en) | 1998-09-14 |
| CN1125474C (en) | 2003-10-22 |
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