CN1098568A - Permanent magnet motor - Google Patents
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- CN1098568A CN1098568A CN 94107748 CN94107748A CN1098568A CN 1098568 A CN1098568 A CN 1098568A CN 94107748 CN94107748 CN 94107748 CN 94107748 A CN94107748 A CN 94107748A CN 1098568 A CN1098568 A CN 1098568A
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Abstract
A kind of permanent magnet motor, being contained in epitrochanterian each permanent magnet, to form section be arc, simultaneously, these permanent magnets are arranged in the rotor core towards the rotor pivot like that with protuberance.Permanent magnet magnetizes along certain some C of the permanent magnet center of curvature one side is distributed as the radiation direction at center with its easy direction of magnetization of each, by making from this, just can seek the raising of driving torque or the reduction of cogging torque to having a certain particular kind of relationship by the distance L at permanent magnet thickness direction center and the mean radius of curvature R of permanent magnet.
Description
The present invention relates to have a plurality of permanent magnets are contained in rotor core inside and the permanent magnet motor of formation rotor.
For permanent magnet motor, develop the motor of structure shown in Figure 13 recently, with the purpose that realizes seeking high torqueization and high efficiency.It has following such structure.
That is, stator 1 constitutes like this: insert in formed 12 grooves 3 in the stator core 2 that is ring-type and arrange U phase stator coil 1U, 2U, V phase stator coil 1V, 2V and W phase stator coil 1W, 2W.
Corresponding with it, as shown in figure 14, be contained in the rotor core 6 the formed accommodation section 7 from axial insertion by being section circular-arc 4 magnets 8, and rotating shaft 5 embedded the central part that is fixed on rotor core 6, and constitute rotor 4, rotatably dispose rotor 4 at the space segment of stator core 2 with the state that has predetermined air gap 9 with perimeter surface in it.Each permanent magnet 8 on the rotor 4 is arranged towards the periphery of rotor core 6 like that with protuberance 8a, and 4 permanent magnets 8 alternately magnetize like that for the N utmost point and the S utmost point in Figure 13 and Figure 14.
Figure 15 and Figure 16 are the figure of the magnetic anisotropy of expression permanent magnet.Wherein, Figure 15 represents that the easy direction of magnetization B of each several part of permanent magnet 8 is along the figure that with rotor 4 pivot A is the radiation direction distribution at center; Figure 16 is that the easy direction of magnetization B of each several part of expression permanent magnet 8 is infinite point and the figure of parallel distribution with the center, waits according to purposes and selects to use these magnetic anisotropies.
Figure 17 represents to be used for electric motor driven so-called inverter power supply.In this Figure 17, switch main circuit circuit 11 links to each other with DC power supply 10.This switch main circuit 11 is to be connected into three-phase bridge and constituted by 6 triodes 12 and backflow diode 13.In this switch main circuit 11, the common tie point with triode 12 of three-phase each bridge arm 11U, 11V, 11W is connected respectively on corresponding output line U, V to motor, the W.These output lines U, V, W be with each phase stator coil 1U, 2U, the 1V of above-mentioned stator 1,2V and 1W, and 2W is connected.
Therefore, in this permanent magnet motor, obtain rectangle or trapezoidal magnetic flux distribution in the air gap 9 of magnetic flux between stator 1 and rotor 4 by permanent magnet 8.As known in the art, the torque of motor only just produces when electric current flows through stator coil, and is represented with following formula (1):
T＝m×K×B×I （1）
Wherein, T: motor torque
K: with the relevant constant of the stator coil number of turn
B: the magnetic flux density of air gap
I: coil current
M: the number of phases of motor
Like this, under the mode of for example 180 degree energisings, because a magnetic flux under extremely of permanent magnet 8 works with torque, the magnetic track in the air gap 9 of a utmost point will exert an influence to the performance of motor.
Therefore, under the situation of above-mentioned existing structure, structurally, the magnetic flux in the air gap 9 can be very not big, and then the driving torque of motor is just lower.For this reason, just the miniaturization of current machine and the raising that drives efficient are produced restriction,, just more require motor miniaturization owing to use the machine of motor very big, and, also more require to drive the raising of efficient on the energy-conservation viewpoint.
In 120 degree step modes, what permanent magnet 8 was produced one extremely descend only 120 spending torque is worked of magnetic flux.Figure 19 represents the distribution of the magnetic flux width in the air gap 9 of the prior art.In this Figure 19, because the magnetic flux with interval i.e. 0 degree～30 degree zones of the represented non-energising of oblique line part and 150 degree～180 degree zones does not work to the driving torque of motor, just can not use the magnetic flux that is produced by permanent magnet 8 effectively, because the driving torque of motor reduces, will produce restriction to the miniaturization of motor and the raising of driving torque efficient, thereby such defective is just arranged.
On the other hand, in the magnetic flux of such air gap 9, contain 3 times, 5 times, 7 inferior high order harmonic components.The shape that reduces the rotor core 6 of these high order harmonic components will be restricted, owing to the degree of freedom of design low get off to make purposes to be restricted, generally be very difficult so reduce high order harmonic component, then common, in air gap, contain more high order harmonic component composition.
Because these high order harmonic component compositions just have more energy composition in air gap 9.Peristome 3a with the groove in the stator core 3 interacts by such energy composition, and has produced cogging torque.Though this cogging torque is superimposed with the generation torque of motor, but can not work as effective driving torque, owing to there is the torque that applies vibration to rotor, this vibration will be transmitted on the machine of the frame of motor and drive motor and become vibration and noise source.
First purpose of the present invention provides a kind of improved permanent magnet motor, in the permanent magnet motor that has comprised the rotor that rotor core inside that a plurality of permanent magnets are packed into is constituted, can increase between stator and rotor the magnetic flux density in the air gap as far as possible and can increase driving torque, just can realize miniaturization thus or raise the efficiency.
Second purpose of the present invention provides a kind of improved permanent magnet motor, in the permanent magnet motor that has comprised the rotor that rotor core inside that a plurality of permanent magnets are packed into is constituted, can make that the magnetic flux distribution in the air gap reduces the high order harmonic component composition as far as possible between stator and rotor, seeking to reduce cogging torque, and then reduce vibration and noise.
In order to implement first purpose, improved permanent magnet motor of the present invention, comprising: have stator for the stator core of ring-type and the multi phase stator coil in the stator core; With constituted by rotor core inside that a plurality of permanent magnets are packed into, the rotor that in the space segment of said stator iron core, rotatably is provided with the state that has predetermined air gap with inner circumferential surface, rotate the above-mentioned rotor of driving by in the said stator coil, switching on successively, it is characterized in that:
Form when section is arcuation at each permanent magnet that makes above-mentioned rotor, its protuberance is arranged on these permanent magnets in the above-mentioned rotor core like that towards rotor center, and, permanent magnet magnetizes like this: the easy direction of magnetization of its each several part is that the radiation direction at center distributes along certain the some C that makes permanent magnet center of curvature side, and the distance L that arrives the center line by permanent magnet thickness direction center from this C with the pass of the mean radius of curvature R of permanent magnet is: 1.0 * R≤L≤7.5 * R.
According to this improved permanent magnet motor, (referring to Fig. 3) is indicated by experimental result, can increase the magnetic flux width in the air gap between stator and rotor, and then can increase driving torque.
In such permanent magnet motor, especially the number of phases at stator coil is the situation of 3n phase (n is a natural number), and the distance L that arrives the center line by permanent magnet thickness direction center with above-mentioned some C preferably is set at the relation of the mean radius of curvature R of permanent magnet: 0.5 * R≤L≤7.0 * R.By stator coil each mutually in the about 120 degree electrical degrees of per pass electricity drive under the situation of permanent magnet motor of rotor rotation, preferably be set at from the relation of the distance L of above-mentioned C arrival by the center line at permanent magnet thickness direction center: 0.25 * R≤L≤6.0 * R with the mean radius of curvature R of permanent magnet.
In order to realize second purpose, improvement permanent magnet motor of the present invention is comprising the stator that has for the stator core of ring-type and the multi phase stator coil in this stator core; With constitute by a plurality of permanent magnets are packed into rotor core is inner, the rotor that in the space segment of said stator iron core, rotatably is provided with the state that has predetermined air gap with inner circumferential surface, rotate the above-mentioned rotor of driving by in the said stator coil, switching on successively, it is characterized in that:
Form when section is arcuation at each permanent magnet that makes above-mentioned rotor, its protuberance is arranged on these permanent magnets in the above-mentioned rotor core like that towards the rotor pivot, and, permanent magnet magnetizes like this: the easy direction of magnetization of its each several part is that the radiation direction at center distributes along certain the some C that makes permanent magnet center of curvature side, and the distance L that arrives the center line by permanent magnet thickness direction center from this C with the pass of the mean radius of curvature R of permanent magnet is: 0.4 * R≤L≤0.9 * R.
According to this improved permanent magnet motor, (referring to Figure 12) is indicated by experimental result, and for the magnetic flux width in the air gap between stator and rotor, especially 3 subharmonic compositions have reduced, and corresponding therewith, cogging torque has also reduced.
Fig. 1 is the schematic diagram of the major part size relationship of expression first embodiment of the invention;
Fig. 2 is the sectional drawing of motor;
Fig. 3 is the figure of expression L/R with the relation of the magnetic flux in the air gap;
Fig. 4 be the expression second embodiment of the invention with the corresponding figure of Fig. 3;
Fig. 5 is the rotor-side view of expression third embodiment of the invention;
Fig. 6 be the expression fourth embodiment of the invention with the corresponding figure of Fig. 1;
Fig. 7 is and the corresponding figure of Fig. 2;
Fig. 8 is the figure of the air-gap flux width distribution under the expression 1 extremely;
Fig. 9 is the figure of expression L/R with the relation of the air-gap fluxs of 1 degree of 120 in extremely;
Figure 10 be the expression fifth embodiment of the invention with the corresponding figure of Fig. 1;
Figure 11 is and the corresponding figure of Fig. 2;
Figure 12 is the figure of expression L/R with the relation of 3 subharmonic magnetic flux width containing ratios;
Figure 13 is the motor sectional drawing of expression existing structure;
Figure 14 is the end view of rotor;
Figure 15 is the figure of the distribution of the easy direction of magnetization of expression permanent magnet;
Figure 16 is the figure of the easy direction of magnetization of expression with the different distribution of Figure 15;
Figure 17 is a circuit structure diagram;
Figure 18 is the figure that is illustrated in the conduction time of the stator coil under the 120 degree energising situations;
Figure 19 is the figure of the air-gap flux width distribution under the expression 1 extremely.
Come in three-phase 4 utmost point permanent magnet motors, using the first embodiment of the present invention to describe below with reference to Fig. 1 to Fig. 3.
At first, in Fig. 2, stator 21 is identical with existing structure, in formed 12 grooves 23, inserts the stator coil 1U that arranges the U phase, 2U, the stator coil 1V of V phase, 2V and W stator coil 1W mutually, 2W in the stator core 22 that is ring-type.For each groove 23, its peristome 23a is formed on the inner peripheral surface of stator core 22.
Relative with it, rotor 24 constitutes like this: rotating shaft 25 embeds and is fixed in the rotor core 26, in this rotor core 26 in the formed accommodation section 27, from axially inserting section is 4 permanent magnets 28 that arcuation is made for circular-arc ferrite at this moment, thereby form rotor 24, in the space segment of stator core 22, rotor 24 rotatably is set with the state that has predetermined air gap 29 with inner circumferential surface.Rotor core 26 constitutes by the silicon steel sheet that has formed the hole that is used for accommodation section 27 is multi-layer stacked.
Above-mentioned each permanent magnet 28 is to be that rotating shaft 25 is arranged like that with its protuberance 28a towards the pivot of rotor 24, and 4 permanent magnets 28 are alternately magnetized like that with the N utmost point and the S utmost point of Fig. 2.Each permanent magnet 28 magnetizes like this: as shown in Figure 1, the easy direction of magnetization B of its each several part, in the side of the center of curvature O of permanent magnet 28, and along being that the radiation direction at center distributes to be positioned at this center of curvature O with certain the some C on the line of rotor 24 pivots.When the distance that arrives the center line D by permanent magnet 28 thickness direction centers from this C is L; When the mean radius of curvature of permanent magnet 28 is R, these distance L and mean radius of curvature be set at have 1.0 * R≤relation of L≤7.5 * R.
The motor of Gou Chenging like this, (referring to Figure 17) powers by inverter power supply same as the prior art, comes to stator coil 1U, and 2U, 1V, 2V and 1W, 2W carry out for example 180 degree energisings.Thus, produce rotating magnetic field, make rotor 24 rotations by magnetic attraction and repulsion thereupon by stator 21.
At this, in Fig. 3, express in the permanent magnet 28 on above-mentioned rotor 24, extremely descend the experimental result of the relation of the magnetic flux in the air gap 29 as the L/R and of the ratio of distance L mean radius of curvature R.
Indicated by this Fig. 3, when the value of L/R is in 1.0～7.5 scopes, can increase the magnetic flux in the air gap 29 as can be seen.Thus, has 1.0 * R≤relation of L≤7.5 * R by the value of L/R being set in 1.0～7.5 the scope promptly L and R be set at, just can increase the magnetic flux in the air gap 29, just can increase driving torque, just might improve the miniaturization or the efficient of motor thus.At this moment, with the easy direction of magnetization of each several part, at infinite point and the situation of parallel distribution is compared (L/R infinity), can increase the magnetic flux in the air gap 29 as can be seen with the center.
Fig. 4 is the expression second embodiment of the present invention, and in this second embodiment, the stator coil of stator 21 especially is applicable to the situation of 3n phase (n is a natural number).The stator coil of stator 21, particularly under the situation of 3n phase, in the magnetic flux in air gap 29, because so-called 3 times, 9 times, 15 times ... the magnetic flux of harmonic wave does not play effective function in stator coil, the data that Fig. 4 expresses with the experimental result of Fig. 3 are prototype, the result who removes these high order harmonic component compositions by calculating.
Indicated by this Fig. 4, be under the situation of 3n phase at stator coil, when in the scope of value of L/R, can increase the magnetic flux in the air gap 29 as can be seen 0.5～7.0.Thus, has 0.5 * R≤relation of L≤7.0 * R by the L/R value being set in 0.5～7.0 the scope promptly L and R be set at, just can increase the magnetic flux in the air gap 29, thereby can increase driving torque, just can realize the miniaturization of motor or the raising of efficient thus.In this case, with the center infinite point and the situation (L/R is for infinitely great) of parallel distribution is compared with the easy direction of magnetization of each several part, can increase the magnetic flux in the air gap 29 as can be seen.
Fig. 5 is the expression third embodiment of the present invention.In this second embodiment, the permanent magnet 30 of rotor 24 forms section for being the arc of the such shape of straight line with the relative side of circular arc.And such permanent magnet 30 is arranged like this: its protuberance 30a is towards the pivot (rotating shaft 25) of rotor 24.
In this case, for permanent magnet 30, average thickness size according to this permanent magnet 30 is set mean radius of curvature R, simultaneously, the easy direction of magnetization B of each several part is that the radiation direction at center distributes permanent magnet 30 is magnetized along certain the some C with permanent magnet 30 center of curvature O one side, arrive the distance L of permanent magnet 30 thickness direction average centerline D and the relation of mean radius of curvature R by resembling to set first embodiment or second embodiment, just can obtain identical effect from this C.
Fig. 6 to Fig. 9 is the expression fourth embodiment of the present invention.The 4th embodiment though the basic structure of motor is identical with above-mentioned first embodiment, also has following what time different with first embodiment.
Promptly, for the permanent magnet on the rotor 24 28, be set at from the mean radius of curvature R of the distance L that arrives the center line D by permanent magnet 28 thickness direction centers as the easy some C of the radiation center of direction of magnetization B and permanent magnet 28 and have 0.25 * R≤relation of L≤6.0 * R.
Thereby, the motor of Gou Chenging like this, though be by inverter power supply (referring to Figure 17) power supply, at this moment, by to stator coil 1U, 2U, 1V, 2V and 1W, 2W carry out 120 and fill energising and come drive motor.By such energising, produce rotating magnetic field by stator 21, make the rotor rotation by magnetic pull and repulsion thereupon.
At this moment, by permanent magnet 28 in air gap 29 formed magnetic flux width distribution for as shown in Figure 8.Indicated by this Fig. 8, as can be seen, in the 4th embodiment, the magnetic flux in the non-energising represented by the oblique line part interval (zones of 0 degree～30 degree zones and 150 degree～180 degree) has reduced, and the magnetic flux in energising interval (30 degree～150 degree) has increased.
In Fig. 9,, express as the L/R of the ratio of distance L and average radius of curvature R with 120 degree of 1 utmost point experimental result of the relation of the magnetic flux in the air gap 29 down for the permanent magnet 28 on the above-mentioned rotor 24.Indicated by this Fig. 9, when the L/R value is in 0.25～6.0 scope, can increase the magnetic flux in the air gap 29, in this case, with the easy direction of magnetization of each several part is center and the situation (L/R infinity) of parallel distribution is compared with the infinite point, can see the magnetic flux that can increase in the air gap 29.
This shows, has 0.25 * R≤relation of L≤6.0 * R by the value of L/R being set in 0.25～6.0 the scope promptly L and R be set at, by part corresponding to the energising interval, just can increase the magnetic flux of the permanent magnet 28 that in air gap 29, works as much as possible, thereby can increase driving torque, just can realize the miniaturization of motor or the raising of efficient thus.
And, in the 4th embodiment, also can be identical with the 3rd enforcement (referring to Fig. 5), make the permanent magnet 30 of rotor 24 form section for being the arc of the such shape of straight line with the relative side of circular arc, arrange this permanent magnet like that with the pivot (rotating shaft 25) of the rich rotor 24 of protuberance 30a.
Figure 10 to Figure 12 is the expression fifth embodiment of the present invention, the 5th embodiment, though the basic structure of motor is identical with the 4th embodiment with first embodiment, also have different with these embodiment following some.
Promptly, for the permanent magnet on the rotor 24 28, having 0.4 * R from being set at the mean radius of curvature R of permanent magnet 28 to the distance L of the center line D by permanent magnet 28 thickness direction centers≤relation of L≤0.9 * R as the some C of the easy radiation center of direction of magnetization B.
Thereby, the motor of Gou Chenging like this, though by inverter power supply (referring to Figure 17) power supply, identical with the 4th embodiment at this moment, drive by 120 degree energisings.By this energising, produce rotating magnetic field by stator 21, make rotor 24 rotations by magnetic pull and repulsion thereupon.
At this, in Figure 12, for the permanent magnet 28 on the above-mentioned rotor 24, express the experimental result of the relation of containing ratio as 3 subharmonic magnetic flux width in the L/R of the ratio of distance L and average rate radius R and the air gap 29 (corresponding to the fundamental flux width in the air gap).And express: the negative region of the containing ratio of 3 subharmonic magnetic wave width, its phase place with respect to first-harmonic is anti-.
Indicated by Figure 12, when in the scope of value of L/R, can reduce containing ratio as can be seen as the magnetic flux width of 3 subharmonic of high order harmonic component major part 0.4～0.9.Thus, have 0.4 * R≤relation of L≤0.9 * R by the value of L/R being set in 0.4～0.9 the scope promptly L and R be set at, as the magnetic flux width in the air gap 29, the high order harmonic component composition seldom.That is,, just can reduce cogging torque because the magnetic flux width in the air gap 29 approaches sine wave as much as possible.
Like this, can make magnetic flux width in the air gap 29 only with the distribution of shapes of sine wave by reducing the high order harmonic component composition of the magnetic flux width in the air gap 29 as far as possible with this structure, thereby reduced the high order harmonic component energy in the air gap 29, owing to reduced the energy changing that causes because of interaction with the peristome 23a of groove 23 on the fixed core 22, just reduce cogging torque, and then can suppress electronic vibration and noise.
In the 5th embodiment, also can be identical with the 3rd embodiment (referring to Fig. 5), for the permanent magnet 30 of rotor 24, the arc that it is the such shape of straight line that its section forms with the relative side of circular arc is arranged permanent magnet 30 with its protuberance 30a like that towards the pivot (rotating shaft 25) of rotor 24.
The present invention not only is subjected to the restriction of the various embodiments described above, also can be following distortion or expansion.
The number of permanent magnet (number of poles) can be outside 4 utmost points, and number of stator slots can be outside 12 grooves.Permanent magnet can be outside the ferrite, and itself so long as arc also can be an oval part.
Claims (4)
1, a kind of permanent magnet motor, comprising: have and be the stator core 22 of ring-type and the multi phase stator coil in this stator core 22,1U, 1V, 1W, 2U, 2V, the stator 21 of 2W; With by a plurality of permanent magnets 28,30 pack into rotor cores 26 are inner and constitute, the rotor 24 that in the space segment of said stator iron core 22, rotatably is provided with the state that has predetermined air gap 29 with inner circumferential surface, by at said stator coil 1U, 1V, 1W, 2U, 2V, switching on successively to rotating among the 2W drives above-mentioned rotor 24, it is characterized in that:
Make each permanent magnet 28 of above-mentioned rotor 24,30 to form its section be arc, simultaneously, with protuberance 28a, 30a comes these permanent magnets 28 like that towards the pivot of rotor 24,30 are arranged in the above-mentioned rotor core 26, and, permanent magnet 28,30 magnetize along the center of curvature one side point C of permanent magnet 28,30 is distributed as the radiation direction at center with the easy direction of magnetization of its each several part, from this C to by permanent magnet 28, the distance L of the center line at 30 thickness direction centers with the pass of the mean radius of curvature R of permanent magnet 28,30 is:
1.0×R≤L≤7.5×R。
2, a kind of permanent magnet motor, comprising: stator coil 1U had, 1V, 1W, 2U, 2V, the stator 21 of 2W for the stator core 22 of ring-type and the 3n phase (n is a natural number) in this stator core 22; With by a plurality of permanent magnets 28,30 pack into rotor cores 26 are inner and constitute, the rotor 24 that in the space segment of said stator iron core 22, rotatably is provided with the state that has predetermined air gap 29 with inner circumferential surface, by at said stator coil 1U, 1V, 1W, 2U, 2V, switching on successively to rotating among the 2W drives above-mentioned rotor 24, it is characterized in that:
Make each permanent magnet 28 of above-mentioned rotor 24,30 to form its section be arc, simultaneously, with protuberance 28a, 30a comes these permanent magnets 28 like that towards the pivot of rotor 24,30 are arranged in the above-mentioned rotor core 26, and, permanent magnet 28,30 magnetize along the center of curvature one side point C of permanent magnet 28,30 is distributed as the radiation direction at center with the easy direction of magnetization of its each several part, from this C to by permanent magnet 28, the distance L of the center line at 30 thickness direction centers with the pass of the mean radius of curvature R of permanent magnet 28,30 is:
0.5×R≤L≤7.0×R。
3, a kind of permanent magnet motor, comprising: have and be the stator core 22 of ring-type and the multi phase stator coil 1U in this stator core 22,1V, 1W, 2U, 2V, the stator 21 of 2W; With by a plurality of permanent magnets 28,30 pack into rotor cores 26 are inner and constitute, the rotor 24 that rotatably is provided with the state that has predetermined air gap 29 with inner circumferential surface in the part between said stator iron core 22 is by at above-mentioned each phase stator coil 1U, 1V, 1W, 2U, 2V carries out the energising of about 120 degree electrical degrees among the 2W, rotate the above-mentioned rotor 24 of driving, it is characterized in that:
Make each permanent magnet 28 of above-mentioned rotor 24,30 to form its section be arc, simultaneously, with protuberance 28a, 30a comes these permanent magnets 28 like that towards the pivot of rotor 24,30 are arranged in the above-mentioned rotor core 26, and, permanent magnet 28,30 magnetize along the center of curvature one side point C of permanent magnet 28,30 is distributed as the radiation direction at center with the easy direction of magnetization of its each several part, from this C to by permanent magnet 28, the distance L of the center line at 30 thickness direction centers with the pass of the mean radius of curvature R of permanent magnet 28,30 is:
0.25×R≤L≤6.0×R
4, a kind of permanent magnet motor, comprising: have and be the stator core 22 of ring-type and the multi phase stator coil 1U in this stator core 22,1V, 1W, 2U, 2V, the stator 21 of 2W; By a plurality of permanent magnets 28,30 pack into rotor cores 26 are inner and constitute, the rotor 24 that in the space segment of said stator iron core 22, rotatably is provided with the state that has predetermined air gap 29 with inner circumferential surface, by at said stator coil 1U, 1V, 1W, 2U, 2V, switching on successively to rotating among the 2W drives above-mentioned rotor 24, it is characterized in that:
Make each permanent magnet 28 of above-mentioned rotor 24,30 to form its section be arc, simultaneously, with protuberance 28a, 30a comes these permanent magnets 28 like that towards the pivot of rotor 24,30 are arranged in the above-mentioned rotor core 26, and, permanent magnet 28,30 magnetize along the center of curvature one side point C of permanent magnet 28,30 is distributed as the radiation direction at center with the easy direction of magnetization of its each several part, from this C by permanent magnet 28, the distance between center line L at 30 thickness direction centers with the pass of the mean radius of curvature R of permanent magnet 28,30 is:
0.4×R≤L≤0∶9×R。
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP124131/93 | 1993-05-26 | ||
| JP5124134A JPH06339240A (en) | 1993-05-26 | 1993-05-26 | Permanent magnet type motor |
| JP124129/93 | 1993-05-26 | ||
| JP124134/93 | 1993-05-26 | ||
| JP5124131A JPH06339241A (en) | 1993-05-26 | 1993-05-26 | Permanent magnet type motor and manufacture thereof |
| JP124130/93 | 1993-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1098568A true CN1098568A (en) | 1995-02-08 |
| CN1034378C CN1034378C (en) | 1997-03-26 |
Family
ID=26460869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94107748 Expired - Fee Related CN1034378C (en) | 1993-05-26 | 1994-05-26 | Permanent magnetic motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1034378C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127191C (en) * | 1995-05-31 | 2003-11-05 | 松下电器产业株式会社 | Motor with internally mounted permanent magnet |
| CN103078464A (en) * | 2012-12-27 | 2013-05-01 | 上海特波电机有限公司 | Built-in permanent magnet synchronous motor |
| CN105794086A (en) * | 2013-12-20 | 2016-07-20 | 三菱电机株式会社 | Permanent magnet-embedded electrical motor, compressor, and refrigerating air conditioning device |
| WO2016173107A1 (en) * | 2015-04-30 | 2016-11-03 | 苏州腾龙电机科技有限公司 | Direct current brushless motor having embedded magnets |
-
1994
- 1994-05-26 CN CN 94107748 patent/CN1034378C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127191C (en) * | 1995-05-31 | 2003-11-05 | 松下电器产业株式会社 | Motor with internally mounted permanent magnet |
| CN103078464A (en) * | 2012-12-27 | 2013-05-01 | 上海特波电机有限公司 | Built-in permanent magnet synchronous motor |
| CN103078464B (en) * | 2012-12-27 | 2015-04-22 | 上海特波电机有限公司 | Built-in permanent magnet synchronous motor |
| CN105794086A (en) * | 2013-12-20 | 2016-07-20 | 三菱电机株式会社 | Permanent magnet-embedded electrical motor, compressor, and refrigerating air conditioning device |
| US9853510B2 (en) | 2013-12-20 | 2017-12-26 | Mitsubishi Electric Corporation | Permanent magnet-embedded electrical motor, compressor, and refrigerating air conditioning device |
| CN105794086B (en) * | 2013-12-20 | 2019-08-20 | 三菱电机株式会社 | Permanent magnetic baried formula motor, compressor and refrigerating air conditioning device |
| WO2016173107A1 (en) * | 2015-04-30 | 2016-11-03 | 苏州腾龙电机科技有限公司 | Direct current brushless motor having embedded magnets |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034378C (en) | 1997-03-26 |
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