CN1452292A - Permanent magnet for motor - Google Patents
Permanent magnet for motor Download PDFInfo
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- CN1452292A CN1452292A CN 03101855 CN03101855A CN1452292A CN 1452292 A CN1452292 A CN 1452292A CN 03101855 CN03101855 CN 03101855 CN 03101855 A CN03101855 A CN 03101855A CN 1452292 A CN1452292 A CN 1452292A
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- acting surface
- magnet
- permanent magnet
- resin
- motor
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Provided is a permanent magnet which is capable of improving the torque of a motor by utilizing its magnetic field efficiently. The permanent magnet is equipped with either a front surface or a back surface as a working face L1 in a lengthwise cross section, a working region L2 which is located in the working face L1 and narrower than it, non- working side faces H1 adjoining to the working face L1, and a non-working face H2 adjoining to the non-working side faces H1 and opposite to the working face L1. The easy axes of magnetization of magnetic particles composing the permanent magnet are oriented so as to conver substantially the working region L2 from the non-working faces H1 and H2. A relation between the lengths of the non-working face H1 and the working face L1 is so set as to satisfy a formula, 1/10<=H1/L1<=10/10, and a relation between the lengths of the working region L2 and the working face L1 is so set as to satisfy the formula: 35/100<=L2/L1<=98/100.
Description
Technical field
The present invention relates to motor with permanent magnet (the following magnet that also is referred to as simply sometimes), in more detail, the magnetic field that relates to from the acting surface of magnet leaks is few, utilizes magnetic field expeditiously and can improve the motor magnet of the torque of motor.
Background technology
In the prior art, as this magnet, for example, use shown in Figure 14 (A), on the cross section of length direction, from non-acting surface H to the parallel-oriented sector magnet of acting surface L, and shown in Figure 15 (A) from non-acting surface H1, H2 to acting surface L and gather the sector magnet of orientation to middle section.
But, shown in Figure 14 (B), Figure 15 (B), usually, when with the length of magnet 21 with when the length of the rotor 23 of subtend compares with it, the length of magnet 21 is big, and the Surface field of two end regions of these magnet 21 breaks away from the action length of rotor 23, therefore can not be used effectively, the magnetic field that gap between stator 22 and rotor 23 is produced is enough big, thereby, exist the little problem of torque.
In the drawings, the 24th, the ferromagnetism body case, the 25th, the magnetizing coil of rotor, the 26th, axle has omitted brush, bearing, lead etc.
The present invention in order to eliminate the problems referred to above, provides by reducing leakage field, strengthen effective magnetic field, the motor magnet that torque is increased in light of this situation.
Summary of the invention
The present inventor, in order to solve above-mentioned problem, through further investigation, found that, by will forming specific orientation figure at the easy magnetized axle of the magnetic powder on the cross section of length direction, and, make the relation of non-acting surface H1 and acting surface L1 and the length of zone of action L2 and the length of acting surface L1 satisfy specific relation, can solve above-mentioned problem, thereby finish the present invention.
Promptly, technical scheme 1 described permanent magnet of the present invention, on the cross section of length direction, with the surface and the back side in a face as acting surface L1, in this acting surface L1, have the zone of action L2 narrower than this acting surface L1, and, have with the non-acting surface H1 of contacted two sides of aforementioned acting surface L1 and with described two side H1 and contact, be positioned at the non-acting surface H2 of acting surface L1 opposition side, it is characterized by, the easy magnetized axle of magnetic particles that constitutes this magnet is in fact from non-acting surface H1, H2 draws orientation in to zone of action L2, when the length relation of the length of non-acting surface H1 and acting surface L1 satisfied 1/10≤H1/L1≤10/10, the length relation of the length of zone of action L2 and acting surface L1 satisfied 35/100≤L2/L1≤98/100.
Wherein, the circularity coefficient is defined as follows.
Definition: circularity coefficient (%)=4 π S/L
2* 100%
The projected area of S=particle
The girth of L=particle image
As mentioned above, easy the to be magnetized axle of the magnetic powder on making length direction of the present invention cross section forms in the specific orientation figure, by non-acting surface H1 and acting surface L1, and zone of action L2 and acting surface L1 satisfy specific relation, can increase the magnetic field that between magnet and ferromagnetism body, produces effectively, as a result, can improve the torque of motor.
Description of drawings
Fig. 1 is the key diagram of magnet of the present invention.
Fig. 2 is the key diagram of H1/L1 less than 1/10 o'clock magnet.
Fig. 3 is the key diagram of H1/L1 greater than 10/10 o'clock magnet.
Fig. 4 is the key diagram of L21/L1 less than 35/100 o'clock magnet.
Fig. 5 is the key diagram of L21/L1 greater than 95/100 o'clock magnet.
Fig. 6 is the sketch of an example of the expression injection mold assembly that is used to make magnet of the present invention.
Fig. 7 is the sketch of the another one example of the expression injection mold assembly that is used to make magnet of the present invention.
Fig. 8 (A), (B) be expression magnet of the present invention with respect to the profile of length direction, right angle orientation and along the profile of its a-a direction, (C) be the sketch that expression is assembled into the motor of this magnet.
Fig. 9 (A), (B) be expression magnet of the present invention with respect to the profile of length direction, right angle orientation and along the profile of its b-b direction, (C) be the sketch that expression is assembled into the motor of this magnet.
Figure 10 (A), (B) be expression magnet of the present invention with respect to the profile of length direction, right angle orientation and along the profile of its c-c direction, (C) be the sketch that expression is assembled into the motor of this magnet.
Figure 11 (A) is the profile of the length direction of expression magnet of the present invention, (B) is the sketch that expression is assembled into the motor of this magnet.
Figure 12 (A) is the profile of the length direction of expression magnet of the present invention, (B) is the sketch that expression is assembled into the motor of this magnet.
Figure 13 (A), (B) are the front views of expression magnet of the present invention and along the profile of its d-d direction, (C) are the sketch that expression is assembled into the motor of this magnet.
Figure 14 (A) is the profile of length direction of the magnet of expression prior art, (B) is the sketch that expression is assembled into the motor of this magnet.
Figure 15 (A) is the profile of length direction of the magnet of expression prior art, (B) is the sketch that expression is assembled into the motor of this magnet.
Embodiment
Motor of the present invention with permanent magnet as shown in Figure 1, on the cross section of length direction, with the surface and the back side in a face as acting surface L1, in this acting surface L1, have the zone of action L2 narrower than this acting surface L1, and, have with the non-acting surface H1 of contacted two sides of aforementioned acting surface L1 and with described two side H1 and contact, be positioned at the non-acting surface H2 of acting surface L1 opposition side, it is characterized by, the easy magnetized axle of magnetic particles that constitutes this magnet is in fact from non-acting surface H1, H2 draws orientation in to zone of action L2, when the length relation of the length of non-acting surface H1 and acting surface L1 satisfied 1/10≤H1/L1≤10/10, the length relation of the length of zone of action L2 and acting surface L1 satisfied 35/100≤L2/L1≤98/100.
Among the figure, 1 is permanent magnet, and 2 is rotor or stator, below, also they are referred to as the ferromagnetism body sometimes.
In addition, in the present invention, so-called zone of action L2 is meant the zone of carrying out magnetic action with respect to ferromagnetism body 2, is equivalent to the length of ferromagnetism body 2 usually.
In the present invention, when H1/L1 less than 1/10 the time, as shown in Figure 2, the length of magnet 1 is compared excessive with the length of ferromagnetism body 2, the degree of orientation of two ends diminishes, for the ratio of the amount of magnet, can not obtain effect of sufficient, in addition, because the thickness attenuation of magnet 1, because of surface turbulence and chilling cause orientation disorder, can not obtain effect of sufficient, on the other hand, when H1/L2 greater than 10/10 the time, as shown in Figure 3, because the thickness of magnet 1 is blocked up, so the degree of orientation reduces, reduce to the degree of orientation of gathering of zone of action L2, can not obtain effect of sufficient.
In addition, when L2/L1 less than 35/100 the time, as shown in Figure 4, the magnetic field that ferromagnetism body 2 blocks is saturated, uses big magnet to lose meaning.On the other hand, when L2/L1 greater than 95/100 the time, as shown in Figure 5, the length of ferromagnetism body 2 is compared constant basically with the length of magnet 1, to zone of action L2 to gather the degree of orientation limited, can not expect to obtain good effect.
Motor of the present invention can be a kind of in synthetic resin magnet and the sintered magnet with magnet.As the magnetic powder in synthetic resin magnet and the sintered magnet, can use ferrite is the magnetic powder, alnico is the magnetic powder, and samarium-cobalt magnetic powder or neodymium-iron-boron is the magnetic powder, anisotropic magnetic powder commonly known in the art such as terres rares magnetic powder such as samarium-iron-nitrogen system magnetic powder
Particularly, with samarium-iron-nitrogen is principal component, the average grain diameter of its magnetic powder is 0.8～8 μ m, its circularity coefficient is that magnetic powder more than 78% is because of obtaining to improve easily the degree of orientation that is shaped in magnetic field, simultaneously, have the good synthetic resin magnet of intrinsic coercitive magnetic properties concurrently but suitable.
Wherein, the circularity coefficient is defined as follows.
Definition: circularity coefficient (%)=4 π S/L
2* 100%
The projected area of S=particle
The girth of L=particle image.
As the synthetic resin that is used for binding agent of the present invention, can use any binding agent commonly known in the art.As its representational example, can use: polyamide 6, polyamide 12, polyamide 66 contain the polyamide-based resins such as aromatic polyamide of aromatic rings; Polyvinyl chloride resin, vinyl chloride-acetate ethylene copolymer resin, plexiglass, polystyrene resin, with polyethylene and polypropylene etc. separately or the polyolefin-based resins of copolymerization; Polyurethane resin, organic siliconresin, polycarbonate resin, polybutyleneterephthalate (PBT), polyethylene terephthalate mylar such as (PET), polyether-ether-ketone (PEEK) resin, polyphenylene sulfide (PPS) resin, haloflex (CPE) resin, chlorosulfonated polyethylene resin (E.I.Du Pont Company's system commodity " Ha イ パ ロ Application " by name), third rare nitrile-butadiene-styrene (ABS) resin, liquid crystalline resin, epoxy is a resin, and phenolic aldehyde is a resin etc.; Isoprene rubber, neoprene, polystyrene butadiene copolymer resin, butadiene rubber, rubber such as third rare nitrile butadiene; Olefin-based ethene-third is rare-alkadienes-methylene (EPDM), and urethanes system, elastomers such as polyester system etc.They can use separately, also can be use mixing two or more as required.In the middle of them, be preferably polyamide, ABS resin, polyvinyl chloride resin, PPS resin, liquid crystalline resin, elastomer.
In the middle of them, polyamide, third rare nitrile-butadiene-styrene (ABS) resin, polyvinyl chloride resin, polyphenylene sulfide (PPS) resin, chlorinated polyethylene resin is preferred.Be that polyamide, particularly polyamide 6 or polyamide 12 can have high mechanical strength and good heat-resistant more than 100 ℃ and cheapness concurrently, be suitable for motor and use.ABS resin is electroplated easily, be suitable for requiring the health utensil electroplated, polyvinyl chloride resin or chlorinated polyethylene resin and plasticizer use together, be suitable for being involved in the formula motor with stator etc., PPS is owing to its heat resistance and chemical resistance is good and coefficient of thermal expansion is little, so, be applicable under the situation of environment for use harshness and use.
As the cooperation ratio of the synthetic resin of magnetic powder and binding agent, preferred range is, the magnetic powder is 40～70 volume %, and synthetic resin is 60～30 volume %.When magnetic powder less than 40 volume %, the magnetic property deficiency on the other hand, when it surpasses 70 volume %, has the abominable tendency of formability.
In addition, self-evident, can use plasticizer and antioxidant commonly used in the prior art, surface conditioning agent etc. according to different purposes.
As manufacturing process, under the situation of synthetic resin magnet, can use injection molded, compression molding, the method that extrusion molding etc. are known under the situation of sintered magnet, as the method for making of blank, can be used known wet forming, dry pressing.
Fig. 6 is the sketch of an example of expression injection mold assembly, the 11st, and die cavity, the 12nd, cast gate, protrudent pin on 13.In addition, oblique line portion is york piece (a ferromagnetism body), and the part of drawing point is a nonmagnetic material.
Fig. 7 is that expression is controlled at easy the to be magnetized axle of magnetic powder on the cross section of length direction is gathered the metal pattern that is orientated usefulness in the side magnetic circuit.The 11st, die cavity, the 12nd, cast gate, 13 is protrudent pin.In addition, oblique line portion is york piece (a ferromagnetism body), and the part of drawing point is a nonmagnetic material.
When utilizing above-mentioned injection molded metal pattern to make motor of the present invention to use magnet, to be that the resin magnet constituent of principal component is filled in the die cavity 11 via cast gate 12 with magnetic powder and synthetic resin, as shown by arrows, the non-acting surface along easy the to be magnetized axle of magnetic line of force magnetic powder from the outside evenly or gather the acting surface in the inboard be orientated.In addition, in order to add hot runner 12, can be near them configuration heater etc.In this case, usually, the metal pattern main body is provided with heat insulation layer, take appropriate measures not die cavity be heated to temperature required more than.
In addition, compressing forming machine and Press forming machine can use known equipment, can pack into and magnetic circuit that injection mold assembly is same.Under the situation of sintered magnet, can use wet forming, dry pressing manufacture method as blank.
Motor of the present invention is preferably cylindric with the shape of magnet, and is discoid, watt shape.
Below, the form of implementation when motor of the present invention is used as stator or rotor with the preferred implementing form of magnet and with it describes.
Fig. 8 (A) is watt front view of shape magnet 1, and the a-a that (B) is (A) (C) is the simple profile of the motor when moving stator 2 uses with this magnet 1 conduct to profile.Among the figure, 3 is rotor, and 4 is the ferromagnetism body case, and 5 is the magnetizing coil of rotor, and 6 is axle.
Fig. 9 (A) is for being the front view of magnet 1 cylindraceous roughly, and the b-b that (B) is (A) is to profile, (C) for utilizing the simple profile of this magnet 1 as the motor of stator 2 uses.
Figure 10 (A) is the front view of circular magnet 1, and the c-c that (B) is (A) is to profile, (C) for utilizing the simple profile of this magnet 1 as the motor of stator 2.
Figure 11 (A) is the profile of magnet 1 cylindraceous, (B) for using the simple profile of this magnet 1 as the motor of internal rotor 7 uses.Among the figure, 8 is the stator magnetizing coil.
Figure 12 (A) is the profile of cylinder-shaped magnet 1, (B) for using the simple profile of this magnet 1 as the motor of external rotor 9 uses.Among the figure, 10 is the stator magnetizing coil.
Figure 13 (A) is the front view of disk (ring) shape magnet 1, and the d-d that (B) is (A) is to profile, (C) for using the simple profile of this magnet 1 as the motor of rotor 3.Among the figure, 10a is a coreless coil.
Embodiment
Below, the present invention will be described in more detail based on embodiment and comparative example, but therefore the present invention is not subjected to any restriction.
In addition, the proportioning of synthetic resin magnet and sintered magnet and molding condition are as follows.
(proportioning of synthetic resin magnet)
(ferromagnetic oxide powder: magnetoplumbite is the strontium based ferrite to magnetic: 68 volume % average grain diameter 1.5 μ m)
Synthetic resin (polyamide 12) 31 volume %
Surface conditioning agent (TTS: isopropyl three isostearoyl titanate esters) 1 volume %
(molding condition of synthetic resin)
Injection cylinder temperature: 280 ℃
Metal pattern temperature: 100 ℃
Injection pressure: 1500kg/cm
2
Excitation time: 20 seconds
Cooling time: 25 seconds
Injection cycle: 40 seconds
(proportioning of sintered magnet)
(ferromagnetic oxide powder: magnetoplumbite is the strontium based ferrite to magnetic: 50 volume % average grain diameter 1.5 μ m)
Water 50 volume %
(condition of molding of sintered magnet)
Dewatering: chamber mode
Excitatory method: longitudinal magnetic field is shaped
Forming temperature: 25 ℃
Sintering temperature: 1250 ℃
Utilize said ratio and molding condition, make circular motor magnet, as stator, assembling is as Figure 10 or the motor (gap of stator and rotor=0.2mm), estimate its performance shown in Figure 8 with this magnet.The results are shown in table 1.As can be seen from Table 1, embodiment 1 is 1.1 times of gap magnetic field of comparative example 1, in addition, because the L2/L1 of comparative example 2 is little, so gap magnetic field is 0.9 times of comparative example 1.
In addition, for comparative example 1～2, in Figure 10 (B), as shown in figure 14, use from non-acting surface to the parallel-oriented circular magnet of acting surface.
Table 1
| | Comparative example 1 | Comparative example 2 | ||
| The orientation of magnet length (thrust) direction | Orientation is concentrated in the zone of action | Same orientation | Orientation is concentrated in the zone of action | |
| Shape | Circular | Circular | Circular | |
| The cross section orientation maps | Figure 10 | (Figure 10) * | Figure 10 | |
| ??H1/L1 | ??2/10 | ???2/10 | ?2/10 | |
| ??L2/L1 | ??6/10 | ???10/10 | ?3/10 | |
| ??L1 | ??10 | ???10 | ?10 | |
| ??H1 | ??2 | ???2 | ?2 | |
| L2 (=rotor length) | ??6 | ???6 | ?6 | |
| Magnet | Synthetic resin | Synthetic resin | Synthetic resin | |
| The magnetic powder | Ferrite system | Ferrite system | Ferrite system | |
| | Polyamide | 12 | | |
| The orientation in the peripheral direction cross section of magnet | Radially | Radially | Radially | |
| Gap magnetic field | Benchmark A * 1.1 | Benchmark A | Benchmark A * 0.9 | |
| Slot effect (cogging) | ??○ | ???○ | ?◎ | |
| Crackle, breakage | ??◎ | ???◎ | ?◎ |
* in Figure 10 (B), as shown in figure 14, parallel-oriented to acting surface from non-acting surface.
Except that change as shown in table 2, carry out 1 identical operations with embodiment.The results are shown in table 2.In order to compare, the result of embodiment 1 is also listed in the table 2 together.As can be seen from Table 2, embodiment 2～3 increases to 1.06 times, 1.15 times of gap magnetic field of aforementioned comparative example 1.
Table 2
| | | | ||
| The orientation of magnet length (thrust) direction | Orientation is concentrated in the zone of action | Orientation is concentrated in the zone of action | Orientation is concentrated in the zone of action | |
| Shape | Circular | Circular | Circular | |
| The cross section orientation maps | Figure 10 | Figure 10 | Figure 10 | |
| ??H1/L1 | ??2/10 | ??2/10 | ?2/10 | |
| ??L2/L1 | ??6/10 | ??6/10 | ?6/10 | |
| ??L1 | ??10 | ??10 | ?10 | |
| ??H1 | ??2 | ??2 | ?2 | |
| L2 (=rotor length) | ??6 | ??6 | ?6 | |
| Magnet | Synthetic resin | Synthetic resin | Sintering | |
| The magnetic powder | Ferrite system | Ferrite system | Ferrite system | |
| | Polyamide | 12 | | ?-- |
| The orientation in the peripheral direction cross section of magnet | Radially | Central authorities concentrate orientation to magnetic pole | Radially | |
| Gap magnetic field | Benchmark A * 1.1 | Benchmark A * 1.06 | Benchmark A * 1.15 | |
| Slot effect | ??○ | ??◎ | ?○ | |
| Crackle, breakage | ??◎ | ??◎ | ?△ |
Except that change as shown in table 3, carry out 1 identical operations with embodiment.The results are shown in table 3.As can be seen from Table 3, in embodiment 4～6, increase to 1.07 times of gap magnetic field of comparative example 3,1.04 times, 1.10 times.
In addition, for comparative example 3, in Fig. 8 (B), as shown in figure 14, use from non-acting surface to the parallel-oriented watt shape magnet of acting surface.
Table 3
| Embodiment 4 | Comparative example 3 | Embodiment 5 | Embodiment 6 | |
| The orientation of magnet length (thrust) direction | Orientation is concentrated in the zone of action | Same orientation | Orientation is concentrated in the zone of action | Orientation is concentrated in the zone of action |
| Shape | Watt shape | Watt shape | Watt shape | Watt shape |
| The cross section orientation | Fig. 8 | (Fig. 8) * | Fig. 8 | Fig. 8 |
| ?H1/L1 | ??2/14 | ??2/14 | ??2/14 | ??2/14 |
| ?L2/L1 | ??10/14 | ??14/14 | ??10/14 | ??10/14 |
| ?L1 | ??14 | ??14 | ??14 | ??14 |
| ?H1 | ??2 | ??2 | ??2 | ??2 |
| L2 (=rotor length) | ??10 | ??10 | ??10 | ??10 |
| Magnet | Synthetic resin | Synthetic resin | Synthetic resin | Sintering |
| The magnetic powder | Ferrite system | Ferrite system | Ferrite system | Ferrite system |
| Synthetic resin | Polyamide 6 | Polyamide 6 | Polyamide 6 | ??-- |
| The cross section orientation of magnet peripheral direction | Radially | Radially | Central authorities concentrate orientation to magnetic pole | Radially |
| Radial magnetic field | Benchmark A * 1.07 | Benchmark A | Benchmark A * 1.04 | Benchmark A * 1.10 |
| Slot effect | ??○ | ??◎ | ??◎ | ??○ |
| Crackle, breakage | ??◎ | ??◎ | ??◎ | ??△ |
* in Fig. 8, as shown in figure 14, parallel-oriented to acting surface from non-acting surface.
Except that change as shown in table 4, carry out 1 identical operations with embodiment.The results are shown in table 4.As can be seen from Table 4, embodiment 7～9 is 1.1 times, 1.05 times, 1.04 times of gap magnetic field of comparative example 4, in addition, from the contrast of embodiment 8,9 as can be seen, SmFeN is that the average grain diameter of magnetic powder is that the embodiment 8 of 0.8～8 μ m is bigger than the gap magnetic field of the embodiment 9 outside this scope, and then the circularity coefficient is that the embodiment 7 more than 78% is bigger than the gap magnetic field of the embodiment 8 outside this scope.
In addition, for comparative example 4, in Figure 10 (B), as shown in figure 14, use from non-acting surface to the parallel-oriented circular magnet of acting surface.
Table 4
| Embodiment 7 | Comparative example 4 | Embodiment 8 | Embodiment 9 | |
| The orientation of magnet length (thrust) direction | Orientation is concentrated in the zone of action | Same orientation | Orientation is concentrated in the zone of action | Orientation is concentrated in the zone of action |
| Shape | Circular | Circular | Circular | Circular |
| The cross section orientation | Figure 10 | (Figure 10) * | Figure 10 | Figure 10 |
| ??H1/L1 | ??2/10 | ???2/10 | ??2/10 | ??2/10 |
| ??L2/L1 | ??6/10 | ???10/10 | ??6/10 | ??6/10 |
| ??L1 | ??10 | ???10 | ??10 | ??10 |
| ??H1 | ??2 | ???2 | ??2 | ??2 |
| L2 (=rotor length) | ??6 | ???6 | ??6 | ??6 |
| Magnet | Synthetic resin | Synthetic resin | Synthetic resin | Synthetic resin |
| The magnetic powder | SmFeN system | SmFeN system | SmFeN system | SmFeN system |
| Average grain diameter (μ m) | ??3 | ???3 | ??3 | ??10 |
| Circularity coefficient (%) | ??85 | ???85 | ??75 | ??75 |
| Synthetic resin | Polyamide 12 | Polyamide 12 | Polyamide 12 | Polyamide 12 |
| The cross section orientation of magnet peripheral direction | Radially | Radially | Radially | Radially |
| Radial magnetic field | Benchmark A * 1.1 | Benchmark A | Benchmark A * 1.05 | Benchmark A * 1.04 |
* in Figure 10 (B), as shown in figure 14, parallel-oriented to acting surface from non-acting surface.
Claims (5)
1. motor permanent magnet, on the cross section of length direction, with the surface and the back side in a face as acting surface L1, in this acting surface L1, have the zone of action L2 narrower than this acting surface L1, and, have with the non-acting surface H1 of contacted two sides of aforementioned acting surface L1 and with described two side H1 and contact, be positioned at the non-acting surface H2 of acting surface L1 opposition side, it is characterized by, the easy magnetized axle of magnetic particles that constitutes this magnet is in fact from non-acting surface H1, H2 draws orientation in to zone of action L2, when the length relation of the length of non-acting surface H1 and acting surface L1 satisfied 1/10≤H1/L1≤10/10, the length relation of the length of zone of action L2 and acting surface L1 satisfied 35/100≤L2/L1≤98/100.
2. motor permanent magnet as claimed in claim 1, described permanent magnet is made of with magnetic powder and synthetic resin magnetic field orientating.
3. motor permanent magnet as claimed in claim 2, described synthetic resin is from polyamide, third rare nitrile-butadiene-styrene (ABS) resin, polyvinyl chloride resin, polyphenylene sulfide (PPS) resin, and one of them kind that chooses in the chlorinated polyethylene resin.
4. as any one described motor permanent magnet in claim 1～3, magnetic field orientating is principal component with the magnetic powder with samarium-iron-nitrogen, and the average grain diameter of described magnetic powder is 0.8～8 μ m, and its circularity coefficient is more than 78%,
Wherein, the circularity coefficient is defined as follows,
Definition: circularity coefficient (%)=4 π S/L
2* 100%
The projected area of S=particle
The girth of L=particle image.
5. as any one described motor is with as described in the permanent magnet in the claim 1～4, being shaped as of permanent magnet is circular, and be cylindric, discoid or watt shape.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP117306/2002 | 2002-04-19 | ||
| JP2002117306A JP2003318012A (en) | 2002-04-19 | 2002-04-19 | Permanent magnet for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1452292A true CN1452292A (en) | 2003-10-29 |
Family
ID=29243488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03101855 Pending CN1452292A (en) | 2002-04-19 | 2003-01-20 | Permanent magnet for motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2003318012A (en) |
| CN (1) | CN1452292A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103828194A (en) * | 2011-10-18 | 2014-05-28 | 株式会社东芝 | Permanent magnet motor and washing machine |
| EP3118869A1 (en) * | 2015-07-03 | 2017-01-18 | Jtekt Corporation | Manufacturing method of rotor and rotor |
| EP3118870A1 (en) * | 2015-07-03 | 2017-01-18 | Jtekt Corporation | Manufacturing method of rotor and rotor |
| CN109979705A (en) * | 2017-12-22 | 2019-07-05 | 西门子歌美飒可再生能源公司 | Sintered magnetic body, magnet, motor, wind turbine, and method for manufacturing sintered magnetic body |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004001117A1 (en) * | 2004-01-07 | 2005-08-18 | Robert Bosch Gmbh | Magnetic means for electrical machines |
| JP2006304453A (en) * | 2005-04-19 | 2006-11-02 | Mitsubishi Electric Corp | Permanent magnet motor |
| JP5386250B2 (en) * | 2009-07-06 | 2014-01-15 | ミネベア株式会社 | Magnet for motor, method for manufacturing the same, and motor |
| US9312057B2 (en) * | 2013-01-30 | 2016-04-12 | Arnold Magnetic Technologies Ag | Contoured-field magnets |
| TWI682409B (en) | 2015-03-24 | 2020-01-11 | 日商日東電工股份有限公司 | Rare earth magnet and linear motor using the magnet |
| TWI679658B (en) | 2015-03-24 | 2019-12-11 | 日商日東電工股份有限公司 | Rare earth permanent magnet and rotating machine with rare earth permanent magnet |
| US20160379755A1 (en) | 2015-06-24 | 2016-12-29 | Jtekt Corporation | Manufacturing method for magnet and magnet |
-
2002
- 2002-04-19 JP JP2002117306A patent/JP2003318012A/en not_active Withdrawn
-
2003
- 2003-01-20 CN CN 03101855 patent/CN1452292A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103828194A (en) * | 2011-10-18 | 2014-05-28 | 株式会社东芝 | Permanent magnet motor and washing machine |
| CN103828194B (en) * | 2011-10-18 | 2016-05-11 | 株式会社东芝 | Magneto and washing machine |
| EP3118869A1 (en) * | 2015-07-03 | 2017-01-18 | Jtekt Corporation | Manufacturing method of rotor and rotor |
| EP3118870A1 (en) * | 2015-07-03 | 2017-01-18 | Jtekt Corporation | Manufacturing method of rotor and rotor |
| CN109979705A (en) * | 2017-12-22 | 2019-07-05 | 西门子歌美飒可再生能源公司 | Sintered magnetic body, magnet, motor, wind turbine, and method for manufacturing sintered magnetic body |
| CN109979705B (en) * | 2017-12-22 | 2022-03-01 | 西门子歌美飒可再生能源公司 | Sintered magnetic body, magnet, motor, wind turbine, and method for manufacturing sintered magnetic body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003318012A (en) | 2003-11-07 |
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