CN102668329A - Permanent-magnet synchronous motor - Google Patents
Permanent-magnet synchronous motor Download PDFInfo
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- CN102668329A CN102668329A CN2010800519475A CN201080051947A CN102668329A CN 102668329 A CN102668329 A CN 102668329A CN 2010800519475 A CN2010800519475 A CN 2010800519475A CN 201080051947 A CN201080051947 A CN 201080051947A CN 102668329 A CN102668329 A CN 102668329A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
- H02K1/2733—Annular magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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Abstract
Provided is a permanent-magnet synchronous motor whereby a 12f component of torque ripple can be minimized when using a radial anisotropic ring magnet in a small-diameter motor. Said synchronous motor has Z annular stators with wire windings and a permanent magnet with 2P poles, Z/(3(phases)*2P) being either 2/5 or 2/7 (3 being the number of phases). If a radial anisotropic ring magnet is used as the permanent magnet, a 12f component of torque ripple can be minimized by magnetizing the radial anisotropic ring magnet such that the ratio of a flat region to a transition region in the magnetization waveform of one magnetic pole has an appropriate value given tw/h, where h is the tip width of flange parts constituting the tip sections of the stators and tw is the base width of said flange parts.
Description
Technical field
The present invention relates to a kind of permanent magnet type synchronous motor of controlling torque pulsation.
Background technology
In the permanent magnet type synchronous motor of 1 coil of having been reeled in each tooth concentrated area, under the situation of the combination of suitably having selected number of poles and groove number, can reduce the cogging torque when not having energising significantly.Yet in this case, the torque pulsation during energising becomes problem.
This torque pulsation results from the distortion of induced voltage.Thereby in order to reduce the induced voltage high order harmonic component, having carried out magnet shape etc. worked hard makes the gap magnetic flux distribution more near sinuous design.In addition, following technology has been proposed also: cut apart magnet and make the magnetic flux density of magnet have variation, make the gap magnetic flux distribution near sinusoidal wave shape (for example, with reference to patent documentation 1).
Patent documentation 1: TOHKEMY 2008-067561 communique
Summary of the invention
Yet there was following problem in technology in the past.
In the little motor of diameter, the diameter of rotor also diminishes.Therefore, be difficult to sticking block (segment) magnet (magnet of one pole), use radial anisotropic annular magnet, utmost point anisotropy annular magnet sometimes as magnet.Here, utmost point anisotropy annular magnet is compared the cost height with the radial anisotropic annular magnet, therefore in the little motor of diameter, uses radial anisotropic annular magnet or piece magnet mostly.
Under the situation of sticking block magnet,, can make the gap magnetic flux distribution near sinusoidal wave through its shape is worked hard.In addition, under the situation of using utmost point anisotropy annular magnet, have special orientation, so the gap magnetic flux distribution is distributed as sinusoidal wave shape.
Yet under the situation of using the radial anisotropic annular magnet, the gap magnetic flux distribution generally becomes trapezoidal shape.Therefore, the distortion of induced voltage is compared with piece magnet, utmost point anisotropy annular magnet etc. and is become big, and it is big that torque pulsation also becomes.
On the other hand, in permanent magnet type synchronous motor, when coil does not have energising, when making rotor magnet (rotor) when being rotated by external drive, produce stator core (stator core) and rotor between the torque pulsation composition (cogging torque) that produces.
Generally, the pulse number of the least common multiple of the groove number of this cogging torque generation stator and the number of magnetic poles of permanent magnet along with mechanical 1 rotation of rotor, the size and the pulse number of this cogging torque are inversely proportional.Therefore, in order to reduce the cogging torque of motor, select as the least common multiple change greatly of the groove number of stator and the number of magnetic poles of permanent magnet combination.
Motor as the big combination of this least common multiple has following motor: driven by so-called 3 phase power supplys; Stator with Z (Z is a natural number) forming circular and reeled coil (coil); Have the permanent magnet of the 2P utmost point (P is a natural number), (value of 3 (phases) * 2P) becomes 2/5 or 2/7 to Z/.
(value of 3 (phases) * 2P) becomes in 2/5 or 2/7 the motor, first-harmonic is being made as under 1 time the situation in theory, and 5 times, 7 times coil factor of high order harmonic component is 0.067, and is very little at this Z/.Therefore, when fundamental frequency was made as the 1f of electrical degree, the 6f composition of the torque pulsation during energising (torque pulsation) produced hardly.On the other hand, 11 times, 13 times coil factor of high order harmonic component is 0.933, and is higher.The 12f composition of the torque pulsation (torque pulsation) when therefore, causing producing energising.
The present invention makes for the problem that solves as said, and its purpose is to obtain a kind of when in the little motor of diameter, having used the permanent magnet type synchronous motor that can suppress the 12f composition of torque pulsation low under the situation of radial anisotropic annular magnet.
The permanent magnet type synchronous motor relevant with the present invention has Z the stator forming circular and the coil of having reeled and the permanent magnet of the 2P utmost point, and (value of 3 (phases) * 2P) is 2/5 or 2/7 to Z/; Wherein, Z is a natural number, and P is a natural number; This permanent magnet type synchronous motor is characterised in that, as permanent magnet and application of radial anisotropy annular magnet does not have channel opening portion between adjacent stator fore-end; Be made as h at the width of the front end of the flange part of the fore-end that will constitute stator, when the width of root is made as tw, the radial anisotropic annular magnet satisfies in the shape of stator under the situation of condition of tw/h=1 in the relation in the flat site of magnetization waveform and migration zone; The migration zone is set magnetizes; Make the ratio of the flat site in 1 magnetic pole become 55% ~ 80%, satisfy in the shape of stator under the situation of 1 < tw/>h < 3 condition, the migration zone is set magnetizes; Make the ratio of the flat site in 1 magnetic pole become 55% ~ 90%; Satisfy in the shape of stator under the situation of condition of 3≤tw/>h, the migration zone is set magnetizes, make the ratio of the flat site in 1 magnetic pole become 55% ~ 95%.
In addition, the permanent magnet type synchronous motor relevant with the present invention has Z the stator forming circular and the coil of having reeled and the permanent magnet of the 2P utmost point; (value of 3 (phases) * 2P) becomes 2/5 or 2/7 to Z/, and wherein, Z is a natural number; P is a natural number, and this permanent magnet type synchronous motor is characterised in that, as permanent magnet and application of radial anisotropy annular magnet; Between adjacent stator fore-end, channel opening portion is arranged, the width of the front end of the flange part of the fore-end that will constitute stator be made as h, with the width of root be made as tw, when the width of channel opening portion is made as bg, the radial anisotropic annular magnet is in the relation in the flat site of magnetization waveform and migration zone; (1) when the relation of the width h of the front end of the width bg of channel opening portion and flange part satisfies h/bg=1, satisfy in the shape of stator under the situation of condition of tw/h=1, the migration zone is set magnetizes; Make the ratio of the flat site in 1 magnetic pole become 55% ~ 95%, satisfy in the shape of stator under the situation of 1 < tw/>h < 3 condition, the migration zone is set magnetizes; Make the ratio of the flat site in 1 magnetic pole become 55% ~ 95%, satisfy in the shape of stator under the situation of condition of 3≤tw/>h, the migration zone is set magnetizes; Make the ratio of the flat site in 1 magnetic pole become 55% ~ 80%, satisfied 1 < h/>bg < 3 o'clock in the relation of the width h of the front end of the width bg of channel opening portion and flange part (2), satisfies in the shape of stator under the situation of condition of tw/>h=1; The migration zone is set magnetizes; Make the ratio of the flat site in 1 magnetic pole become 55% ~ 80%, satisfy in the shape of stator under the situation of 1 < tw/>h < 3 condition, the migration zone is set magnetizes; Make the ratio of the flat site in 1 magnetic pole become 55% ~ 95%; Satisfy in the shape of stator under the situation of condition of 3≤tw/>h, the migration zone is set magnetizes, make the ratio of the flat site in 1 magnetic pole become 55% ~ 95%; (3) when the relation of the width h of the front end of the width bg of channel opening portion and flange part satisfies 3≤h/bg; Satisfy in the shape of stator under the situation of condition of tw/h=1, the migration zone is set magnetizes, make the ratio of the flat site in 1 magnetic pole become 55% ~ 90%; Satisfy in the shape of stator under the situation of 1 < tw/>h < 3 condition; The migration zone is set magnetizes, make the ratio of the flat site in 1 magnetic pole become 55% ~ 95%, satisfy in the shape of stator under the situation of condition of 3≤tw/>h; The migration zone is set magnetizes, make the ratio of the flat site in 1 magnetic pole become 55% ~ 95%.
According to the permanent magnet type synchronous motor relevant with the present invention; In the relation in the flat site of the magnetization waveform of radial anisotropic annular magnet and migration zone, the ratio of flat site is designed to suitable value according to odontoid; Reduce the high order harmonic component composition of gap magnetic flux distribution thus, thereby can obtain when in the little motor of diameter, having used the permanent magnet type synchronous motor that can suppress the 12f composition of torque pulsation low under the situation of radial anisotropic annular magnet.
Description of drawings
The sectional view in Fig. 1 cross section that to be expression vertical with the direction of principal axis of permanent magnet type synchronous motor in the execution mode 1 of the present invention.
Fig. 2 is the enlarged drawing of the stator core of the permanent magnet type synchronous motor in the execution mode 1 of the present invention.
Fig. 3 is the enlarged drawing of the rotor core of the permanent magnet type synchronous motor in the execution mode 1 of the present invention.
Fig. 4 is the figure that is illustrated in the magnetic flux density waveform when having used radial anisotropic annular magnet 30 in the permanent magnet type synchronous motor of execution mode 1 of the present invention.
Fig. 5 is the figure with respect to the relation of the ratio of the zero load induced voltage of the ratio of the flat site of 1 magnetic pole of expression in the execution mode 1 of the present invention.
Fig. 6 be the flat site of the magnetic flux density waveform in 1 magnetic pole of expression in the execution mode 1 of the present invention ratio, with the figure of the relation of the size of torque pulsation 12f composition.
The sectional view in Fig. 7 cross section that to be expression vertical with the direction of principal axis of permanent magnet type synchronous motor in the execution mode 2 of the present invention.
Fig. 8 is the enlarged drawing of the stator core of the permanent magnet type synchronous motor in the execution mode 2 of the present invention.
Fig. 9 is the figure with respect to the relation of the ratio of the zero load induced voltage of the ratio of the flat site of 1 magnetic pole of expression in the execution mode 2 of the present invention.
Figure 10 be the tooth front end of the permanent magnet type synchronous motor of expression in the execution mode 2 of the present invention ratio that is shaped as the flat site of the magnetic flux density waveform in 1 magnetic pole under the situation of condition 1 (h/bg=1), with the figure of the relation of the size of torque pulsation 12f composition.
Figure 11 be the tooth front end of the permanent magnet type synchronous motor of expression in the execution mode 2 of the present invention ratio that is shaped as the flat site of the magnetic flux density waveform in 1 magnetic pole under the situation of condition 2 (1 < h/>bg < 3), with the figure of the relation of the size of torque pulsation 12f composition.
Figure 12 be the tooth front end of the permanent magnet type synchronous motor of expression in the execution mode 2 of the present invention be shaped as condition 3 (ratio of the flat site of the magnetic flux density waveform in 1 magnetic pole under 3≤h/bg) the situation, with the figure of the relation of the size of torque pulsation 12f composition.
Embodiment
Below, use description of drawings permanent magnet type synchronous motor of the present invention preferred embodiment.
The present invention is a kind of motor that is driven by so-called 3 phase power supplys; Have Z (Z the is a natural number) stator that forms circular and reeled coil (Coil); Permanent magnet with the 2P utmost point (P is a natural number), (value of 3 (phases) * 2P) becomes 2/5 or 2/7 to Z/, and this motor is characterised in that; Make the magnetic susceptibility variation of annular magnet and the migration zone is set, can suppress the 12f composition of torque pulsation low.In addition, in the execution mode below, (value of 3 (phases) * 2P) is that 2/5 situation is that example describes, but has verified under this value is 2/7 situation and also obtain identical result and identical effect with Z/.
The sectional view in Fig. 1 cross section that to be expression vertical with the direction of principal axis of permanent magnet type synchronous motor in the execution mode 1 of the present invention, illustration the motor of 10 utmost points, 12 grooves under the situation of Z=12,2P=10.Thereby (value of 3 (phases) * 2P) and 12/ (3 * 10)=2/5 is suitable for Z/.The permanent magnet type synchronous motor of Fig. 1 possesses stator core 10 is arranged, rotor core 20 and radial anisotropic annular magnet 30, and stator core 10 has a plurality of tooth portion 11.
Fig. 2 is the enlarged drawing of the stator core 10 of the permanent magnet type synchronous motor in the execution mode 1 of the present invention, and is suitable with the enlarged drawing of the tooth portion 11 of Fig. 1.In the motor of 10 utmost points, 12 grooves shown in Figure 1, that kind as shown in Figure 2 becomes the shape of part very close to each other between adjacent tooth portion 11 (so-called channel opening portion).In addition, each tooth portion 11 has along the flange part 12 of the Zhou Fangxiang of rotor core 20, the width of the front end of the mark among Fig. 2 " h " expression flange part 12, the width of the root of mark " tw " expression flange part 12.
In this odontoid, do not have channel opening portion, so the magnetic conductance of magnet is with low uncertainty.Therefore, can suppress the corresponding cogging torque of pulsating quantity that produces with the least common multiple of the number of magnetic poles of groove number and permanent magnet low.But when overload, the leakage field between groove increases, so the linear characteristic of torque will worsen on the other hand.
Fig. 3 is the enlarged drawing of the rotor core 20 of the permanent magnet type synchronous motor in the execution mode 1 of the present invention, has represented the magnet orientation of rotor.In addition, radial anisotropic annular magnet 30 is the magnet that in 1 magnet, has a plurality of numbers of poles, in Fig. 3, illustrates the boundary of the utmost point and the utmost point for ease, but can't the visual utmost point as shown in figure 3 in material object and the line of demarcation of the utmost point.
Fig. 4 is the figure that is illustrated in the magnetic flux density waveform when having used radial anisotropic annular magnet 30 in the permanent magnet type synchronous motor of execution mode 1 of the present invention.In addition, Fig. 5 is the figure with respect to the relation of the ratio of the zero load induced voltage of the ratio of the flat site of 1 magnetic pole in the execution mode 1 of the present invention.Here, " ratio of flat site " of transverse axis is suitable with ratio with respect to the flat site A1 of the regional A3 of 1 magnetic pole.
In addition, " ratio of zero load induced voltage " of the longitudinal axis is that each zero load induced voltage during with the ratio that changes flat site is expressed as the ratio that maximum is made as at 100% o'clock.The ratio that the ratio of this flat site is made as the flat site of maximum situation and transverse axis is that about 97% situation is suitable, is in 97% at this transverse axis, and the zero load induced voltage of the longitudinal axis has represented peaked 100%.
The ratio bigger (that is, the ratio that moves regional A2 is more little) of the flat site A1 of previous magnetic flux density waveform shown in Figure 4, the zero load induced voltage of that kind as shown in Figure 5 becomes big more.In the motor with the bodily form, zero load induced voltage is high more can to obtain big more output more.Therefore, the regional A2 of migration being got senior general causes the output of motor to descend.
Be suppressed to (that is, in Fig. 5) under the situation below 10% in decline, must the ratio of flat site A1 be made as more than 55% for the ratio with zero load induced voltage is made as more than 90% with zero load induced voltage.In addition; The relation of the ratio of the zero load induced voltage of this ratio with respect to flat site A1 shown in Figure 5 does not rely on the shape of the flange part 12 of tooth portion 11; No matter which type of value the ratio with respect to the width tw of the root of the width h of front end in the flange part 12 of previous tooth portion 11 shown in Figure 2 is, all has identical relation.
Therefore, then explanation can reduce the value of torque pulsation 12 compositions when why the ratio with respect to the width tw of the root of the width h of front end in the flange part 12 of tooth portion 11 is worth.Fig. 6 be the flat site of the magnetic flux density waveform in 1 magnetic pole of expression in the execution mode 1 of the present invention ratio, with the figure of the relation of the size of torque pulsation 12f composition.
This Fig. 6 is to the relation with respect to the size of the 12f composition of the ratio of 3 kinds of modal representation flat sites of the rate of change of the width tw of the root of the width h of front end and torque pulsation in the flange part 12 that makes previous tooth portion 11 shown in Figure 2.In addition, making the 3 kinds of patterns with respect to the rate of change of the width tw of the root of the width h of front end in the flange part 12 is following formula (1) ~ (3).
[pattern 1] tw/h=1 (1)
[pattern 2] 1 < tw/>h < 3 (2)
[mode 3] 3≤tw/h (3)
Whole for each pattern 1 ~ 3, when " ratio of flat site " of transverse axis is about 97% the time, as previous shown in Figure 5 zero load induced voltage become maximum.Therefore, when " sizes of torque pulsation 12 compositions " in the waveform of obtaining in each pattern 1 ~ 3 of Fig. 6 become than " ratio of flat site " to the scope of about size 97% time also little " ratio of flat site ", become as follows.
Scope=55% ~ 80% (4) of " ratio of flat site " in [pattern 1]
Scope=55% ~ 90% (5) of " ratio of flat site " in [pattern 2]
Scope=55% ~ 95% (6) of " ratio of flat site " in [mode 3]
That is, in pattern 1, " sizes of torque pulsation 12 compositions " when the scope of " ratio of flat site " is 85% ~ 95% become than when " ratio of flat site " big for about " sizes of torque pulsation 12 compositions " 97% time.Therefore, can not get reducing the effect of the value of torque pulsation 12 compositions, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (4) of appropriate " ratio of flat site " becomes 55% ~ 80%.
On the other hand, in pattern 2, when " ratio of flat site " " sizes of torque pulsation 12 compositions " when being 95% almost with when " ratio of flat site " equate for about " sizes of torque pulsation 12 compositions " 97% time.Therefore, the effect of value that reduces torque pulsation 12 compositions is few, is used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (5) of appropriate " ratio of flat site " becomes 55% ~ 90%.
And, in mode 3, " ratio of flat site " be " sizes of torque pulsation 12 compositions " in the scope below 95% become than when " ratio of flat site " big for about " sizes of torque pulsation 12 compositions " 97% time.Therefore, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (6) of appropriate " ratio of flat site " becomes 55% ~ 95%.
Thereby; Pattern 1 ~ 3 through according to variform following formula (1) ~ (3) of the flange part 12 of tooth portion 11 uses the scope of following formula (4) ~ (6) to set " ratio of flat site " respectively, can the decline of zero load induced voltage be suppressed at 10% below and the 12f composition of reduction torque pulsation.
As above; According to execution mode 1; Shape through according to the flange part of tooth portion is set " ratio of flat site " in suitable scope; Under the situation of in the little motor of diameter, using the radial anisotropic annular magnet, also can the decline of zero load induced voltage be suppressed at 10% below and the 12f composition of reduction torque pulsation.
In the execution mode 1 formerly, situation shape, that in the little motor of diameter, used the radial anisotropic annular magnet in part very close to each other between the adjacent tooth portion 11 (so-called channel opening portion) has been described.Relative therewith, in this execution mode 2, situation shape, that in the little motor of diameter, use the radial anisotropic annular magnet in gapped part between the adjacent tooth portion 11 (so-called channel opening portion 13) is described.
The sectional view in Fig. 7 cross section that to be expression vertical with the direction of principal axis of permanent magnet type synchronous motor in the execution mode 2 of the present invention, illustration the motor of 10 utmost points, 12 grooves under the situation of Z=12,2P=10.Thereby (value of 3 (phases) * 2P) and 12/ (3 * 10)=2/5 is suitable for Z/.The permanent magnet type synchronous motor of Fig. 7 possesses stator core 10 is arranged, rotor core 20 and radial anisotropic annular magnet 30, and stator core 10 has a plurality of tooth portion 11.
Fig. 8 is the enlarged drawing of the stator core 20 of the permanent magnet type synchronous motor in the execution mode 2 of the present invention, and is suitable with the enlarged drawing of the toothed portion of Fig. 7.In the motor of 10 utmost points, 12 grooves shown in Figure 7, that kind as shown in Figure 8 becomes the shape of gapped part between adjacent tooth portion 11 (so-called channel opening portion 13).In addition, each tooth portion 11 has along the flange part 12 of the Zhou Fangxiang of rotor core 20, the width of the front end of the mark among Fig. 8 " h " expression flange part 12, the width of the root of mark " tw " expression flange part 12.And, the width of the mark among Fig. 8 " bg " expression channel opening portion 13.
In this odontoid, have channel opening portion 13, so the variation of the magnetic conductance of magnet is bigger than the situation of the Fig. 2 in the previous execution mode 1.Therefore, it is bigger than the situation of the odontoid of the Fig. 2 in the previous execution mode 1 that the cogging torque of pulsating quantity of least common multiple that produces the number of magnetic poles of groove number and permanent magnet becomes.But the leakage field between the overload time slot descends on the other hand, compares with the situation of the odontoid of Fig. 2 in the previous execution mode 1, with the linear characteristic of improving torque.
Fig. 9 is the figure with respect to the relation of the ratio of the zero load induced voltage of the ratio of the flat site of 1 magnetic pole of expression in the execution mode 2 of the present invention.Here, " ratio of flat site " of transverse axis is suitable with ratio with respect to the flat site A1 of the regional A3 of 1 magnetic pole.Also the execution mode 1 with previous is identical in this execution mode 2, the ratio of the flat site A1 of magnetic flux density waveform bigger (that is, the ratio that moves regional A2 is more little), and the zero load induced voltage of that kind as shown in Figure 9 becomes big more.
Therefore, be suppressed at (that is, in Fig. 9) under the situation below 10%, must the ratio of flat site A1 be made as more than 55% for the ratio with zero load induced voltage is made as more than 90% in decline with zero load induced voltage.In addition; The relation of the ratio of the zero load induced voltage of this ratio with respect to flat site shown in Figure 9 does not rely on the shape of the flange part 12 of tooth portion 11, in the flange part 12 of previous tooth portion 11 shown in Figure 8 is that which type of value all have identical relation with respect to the ratio of the width tw of the root of the width h of front end and the width bg of channel opening portion no matter be.
Therefore, next, the value that when why the ratio with respect to the width tw of the root of the width h of front end in the flange part 12 of tooth portion 11 is worth, can reduce torque pulsation 12 compositions is described.In addition, in this execution mode 2, the ratio with respect to the width tw of the root of the width h of front end in the flange part 12 of tooth portion 11, the width bg that also comprises channel opening portion 13 is as parameter.Therefore, the value that is divided into h/bg is the condition that situation research of following 3 conditions can be reduced the value of torque pulsation 12 compositions.
[condition 1] h/bg=1 (7)
[condition 2] 1 < h/>bg < 3 (8)
[condition 3] 3≤h/bg (9)
At first, research is made as the situation of h/bg=1 as following formula (7).Figure 10 be the tooth front end of the permanent magnet type synchronous motor of expression in the execution mode 2 of the present invention ratio that is shaped as the flat site of the magnetic flux density waveform in 1 magnetic pole under the situation of condition 1 (h/bg=1), with the figure of the relation of the size of torque pulsation 12f composition.This Figure 10 be under the such condition of h/bg=1 with previous execution mode 1 in Fig. 6 represented the figure of relation of size of 12f composition of ratio and the torque pulsation of the flat site in each patterns of formula (1) ~ (3) identically.
Whole for each pattern 1 ~ 3, when " ratio of flat site " of transverse axis is about 97% the time, as previous shown in Figure 9, zero load induced voltage becomes maximum.Therefore, be used for becoming as follows when " sizes of torque pulsation 12 compositions " become than " ratio of flat site " to the scope of about size 97% time also little " ratio of flat site " when obtaining in the waveform in each pattern 1 ~ 3 of Figure 10.
Scope=55% ~ 95% (10) of " ratio of flat site " in [pattern 1]
Scope=55% ~ 95% (11) of " ratio of flat site " in [pattern 2]
Scope=55% ~ 80% (12) of " ratio of flat site " in [mode 3]
That is, in pattern 1,2, it is littler for about 97% o'clock " sizes of torque pulsation 12 compositions " than " ratio of flat site " that " ratio of flat site " is that " sizes of torque pulsation 12 compositions " in the scope below 95% become.Therefore, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (10), (11) of appropriate " ratio of flat site " becomes 55% ~ 95%.
On the other hand, in mode 3, it is bigger for about 97% o'clock " sizes of torque pulsation 12 compositions " than " ratio of flat site " that the scope of " ratio of flat site " is that 85% ~ 95% o'clock " sizes of torque pulsation 12 compositions " become.Therefore, can not get reducing the effect of the value of torque pulsation 12 compositions, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (12) of appropriate " ratio of flat site " becomes 55% ~ 80%.
Thereby; Be made as under the situation of h/bg=1; Through pattern 1 ~ 3 according to variform following formula (1) ~ (3) of the flange part 12 of tooth portion 11; Use the scope of following formula (10) ~ (12) to set " ratio of flat site " respectively, can the decline of zero load induced voltage be suppressed at 10% below and the 12f composition of reduction torque pulsation.
Then, research is made as 1 < h/>bg < 3 situation as following formula (8).Figure 11 be the tooth front end of the permanent magnet type synchronous motor of expression in the execution mode 2 of the present invention ratio that is shaped as the flat site of the magnetic flux density waveform in 1 magnetic pole under the situation of condition 2 (1 < h/>bg < 3), with the figure of the relation of the size of torque pulsation 12f composition.This Figure 11 be under 1 < h/>bg < 3 such condition with previous execution mode 1 in Fig. 6 represented the figure of relation of size of 12f composition of ratio and the torque pulsation of the flat site in each patterns of formula (1) ~ (3) identically.
Whole for each pattern 1 ~ 3, when " ratio of flat site " of transverse axis for about 97% the time as previous shown in Figure 9 zero load induced voltage become maximum.Therefore, be used for becoming as follows when " sizes of torque pulsation 12 compositions " become than " ratio of flat site " to the scope of about size 97% time also little " ratio of flat site " when obtaining in the waveform in each pattern 1 ~ 3 of Figure 11.
Scope=55% ~ 80% (13) of " ratio of flat site " in [pattern 1]
Scope=55% ~ 95% (14) of " ratio of flat site " in [pattern 2]
Scope=55% ~ 95% (15) of " ratio of flat site " in [mode 3]
That is, in pattern 1, it is bigger for about 97% o'clock " sizes of torque pulsation 12 compositions " than " ratio of flat site " that the scope of " ratio of flat site " is that 85% ~ 95% o'clock " sizes of torque pulsation 12 compositions " become.Therefore, can not get reducing the effect of the value of torque pulsation 12 compositions, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (13) of appropriate " ratio of flat site " becomes 55% ~ 80%.
On the other hand, in pattern 2,3, it is littler for about 97% o'clock " sizes of torque pulsation 12 compositions " than " ratio of flat site " that " ratio of flat site " is that " sizes of torque pulsation 12 compositions " in the scope below 95% become.Therefore, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (14), (15) of appropriate " ratio of flat site " becomes 55% ~ 95%.
Thereby; Be made as under 1 < h/>bg < 3 the situation; Through pattern 1 ~ 3 according to variform following formula (1) ~ (3) of the flange part 12 of tooth portion 11; Use the scope of following formula (13) ~ (15) to set " ratio of flat site " respectively, can the decline of zero load induced voltage be suppressed at 10% below and the 12f composition of reduction torque pulsation.
Then, research is made as the situation of 3≤h/bg as following formula (9).Figure 12 be the tooth front end of the permanent magnet type synchronous motor of expression in the execution mode 2 of the present invention be shaped as condition 3 (ratio of the flat site of the magnetic flux density waveform in 1 magnetic pole under 3≤h/bg) the situation, with the figure of the relation of the size of torque pulsation 12f composition.This Figure 12 be under the such condition of 3≤h/bg with previous execution mode 1 in Fig. 6 represented the figure of relation of size of 12f composition of ratio and the torque pulsation of the flat site in each patterns of formula (1) ~ (3) identically.
Whole for each pattern 1 ~ 3, when " ratio of flat site " of transverse axis is about 97% the time, as previous shown in Figure 9, zero load induced voltage becomes maximum.Therefore, when obtaining in the waveform in each pattern 1 ~ 3 of Figure 12 when being used for " sizes of torque pulsation 12 compositions " and becoming than " ratio of flat site ", become as follows to the scope of about size 97% time also little " ratio of flat site ".
Scope=55% ~ 90% (16) of " ratio of flat site " in [pattern 1]
Scope=55% ~ 95% (17) of " ratio of flat site " in [pattern 2]
Scope=55% ~ 95% (18) of " ratio of flat site " in [mode 3]
That is, in pattern 1, when " ratio of flat site " " sizes of torque pulsation 12 compositions " when being 95% become than when " ratio of flat site " big for about " sizes of torque pulsation 12 compositions " 97% time.Therefore, can not get reducing the effect of the value of torque pulsation 12 compositions, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (16) of appropriate " ratio of flat site " becomes 55% ~ 90%.
On the other hand, in pattern 2,3, when " ratio of flat site " be " sizes of torque pulsation 12 compositions " in the scope below 95% become than when " ratio of flat site " little for about " sizes of torque pulsation 12 compositions " 97% time.Therefore, be used to reduce the value of torque pulsation 12 compositions and scope that kind shown in following formula (17), (18) of appropriate " ratio of flat site " becomes 55% ~ 95%.
Thereby; Be made as under the situation of 3≤h/bg; Through pattern 1 ~ 3 according to variform following formula (1) ~ (3) of the flange part 12 of tooth portion 11; Use the scope of following formula (16) ~ (18) to set " ratio of flat site " respectively, can the decline of zero load induced voltage be suppressed at 10% below and the 12f composition of reduction torque pulsation.
As above; According to execution mode 2; Under the situation that channel opening portion is arranged also through " ratio of flat site " being set in suitable scope according to the shape of the flange part of tooth and the shape of channel opening portion; Even owing to there is channel opening portion also to improve the linear characteristic of torque, can the decline of zero load induced voltage be suppressed at 10% below on this basis and the 12f composition of reduction torque pulsation when in the little motor of diameter, having used under the situation of radial anisotropic annular magnet.
Claims (2)
1. permanent magnet type synchronous motor has Z the stator forming circular and the coil of having reeled and the permanent magnet of the 2P utmost point, and (value of 3 (phases) * 2P) is 2/5 or 2/7 to Z/; Wherein, Z is a natural number, and P is a natural number; This permanent magnet type synchronous motor is characterised in that
As said permanent magnet and application of radial anisotropy annular magnet does not have channel opening portion between adjacent stator fore-end, be made as h at the width of the front end of the flange part of the fore-end that will constitute said stator, when the width of root is made as tw,
Said radial anisotropic annular magnet in the relation in the flat site of magnetization waveform and migration zone,
Satisfy in the shape of said stator under the situation of condition of tw/h=1, become 55% ~ 80% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of 1 < tw/>h < 3 condition, become 55% ~ 90% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of condition of 3≤tw/h, become 55% ~ 95% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole.
2. permanent magnet type synchronous motor has Z the stator forming circular and the coil of having reeled and the permanent magnet of the 2P utmost point, and (value of 3 (phases) * 2P) becomes 2/5 or 2/7 to Z/; Wherein, Z is a natural number, and P is a natural number; This permanent magnet type synchronous motor is characterised in that
As said permanent magnet and application of radial anisotropy annular magnet; Between adjacent stator fore-end, channel opening portion is arranged; The width of the front end of the flange part of the fore-end that will constitute said stator be made as h, with the width of root be made as tw, when the width of said channel opening portion is made as bg
Said radial anisotropic annular magnet in the relation in the flat site of magnetization waveform and migration zone,
(1) when the relation of the width h of the front end of the width bg of said channel opening portion and said flange part satisfies h/bg=1,
Satisfy in the shape of said stator under the situation of condition of tw/h=1, become 55% ~ 95% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of 1 < tw/>h < 3 condition, become 55% ~ 95% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of condition of 3≤tw/h, become 55% ~ 80% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
(2) relation at the width h of the front end of the width bg of said channel opening portion and said flange part satisfied 1 < h/>bg < 3 o'clock,
Satisfy in the shape of said stator under the situation of condition of tw/h=1, become 55% ~ 80% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of 1 < tw/>h < 3 condition, become 55% ~ 95% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of condition of 3≤tw/h, become 55% ~ 95% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
(3) when the relation of the width h of the front end of the width bg of said channel opening portion and said flange part satisfies 3≤h/bg,
Satisfy in the shape of said stator under the situation of condition of tw/h=1, become 55% ~ 90% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of 1 < tw/>h < 3 condition, become 55% ~ 95% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole,
Satisfy in the shape of said stator under the situation of condition of 3≤tw/h, become 55% ~ 95% mode, said migration zone is set magnetizes with the ratio of the said flat site in 1 magnetic pole.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2009-262334 | 2009-11-17 | ||
| JP2009262334 | 2009-11-17 | ||
| PCT/JP2010/069594 WO2011062064A1 (en) | 2009-11-17 | 2010-11-04 | Permanent-magnet synchronous motor |
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| CN102668329A true CN102668329A (en) | 2012-09-12 |
| CN102668329B CN102668329B (en) | 2014-09-17 |
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| JP (1) | JP5419991B2 (en) |
| CN (1) | CN102668329B (en) |
| TW (1) | TWI454020B (en) |
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|---|---|---|---|---|
| CN109075683A (en) * | 2016-05-10 | 2018-12-21 | 三菱电机株式会社 | Permanent magnet-type motor |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPWO2013054439A1 (en) * | 2011-10-14 | 2015-03-30 | 三菱電機株式会社 | Permanent magnet type motor |
| EP2768126B1 (en) * | 2011-10-14 | 2018-06-27 | Mitsubishi Electric Corporation | Permanent magnet motor |
| JP2013132164A (en) * | 2011-12-22 | 2013-07-04 | Sharp Corp | Permanent magnet motor |
| JP5989154B2 (en) * | 2015-02-04 | 2016-09-07 | 三菱電機株式会社 | Permanent magnet type motor |
| JP6723349B2 (en) * | 2016-05-10 | 2020-07-15 | 三菱電機株式会社 | Permanent magnet type motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1189197A (en) * | 1997-09-08 | 1999-03-30 | Matsushita Electric Ind Co Ltd | Permanent magnet synchronous motor |
| JP2003007534A (en) * | 2001-06-18 | 2003-01-10 | Daido Steel Co Ltd | Method for magnetizing permanent magnet, permanent magnet and motor |
| WO2005025037A1 (en) * | 2003-09-04 | 2005-03-17 | Mitsubishi Denki Kabushiki Kaisha | Permanent magnet type synchronization motor and manufacturing method thereof |
| JP2006288042A (en) * | 2005-03-31 | 2006-10-19 | Toshiba Corp | Permanent magnet type motor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6940205B1 (en) * | 1997-09-08 | 2005-09-06 | Matsushita Electric Industrial Co., Ltd. | Permanent magnet synchronous motor |
| JP2008067561A (en) * | 2006-09-11 | 2008-03-21 | Yaskawa Electric Corp | Permanent-magnet electromotor |
-
2010
- 2010-11-04 CN CN201080051947.5A patent/CN102668329B/en active Active
- 2010-11-04 JP JP2011541877A patent/JP5419991B2/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1189197A (en) * | 1997-09-08 | 1999-03-30 | Matsushita Electric Ind Co Ltd | Permanent magnet synchronous motor |
| JP2003007534A (en) * | 2001-06-18 | 2003-01-10 | Daido Steel Co Ltd | Method for magnetizing permanent magnet, permanent magnet and motor |
| WO2005025037A1 (en) * | 2003-09-04 | 2005-03-17 | Mitsubishi Denki Kabushiki Kaisha | Permanent magnet type synchronization motor and manufacturing method thereof |
| JP2006288042A (en) * | 2005-03-31 | 2006-10-19 | Toshiba Corp | Permanent magnet type motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109075683A (en) * | 2016-05-10 | 2018-12-21 | 三菱电机株式会社 | Permanent magnet-type motor |
| CN109075683B (en) * | 2016-05-10 | 2020-07-07 | 三菱电机株式会社 | Permanent magnet type motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5419991B2 (en) | 2014-02-19 |
| WO2011062064A1 (en) | 2011-05-26 |
| TWI454020B (en) | 2014-09-21 |
| TW201131941A (en) | 2011-09-16 |
| CN102668329B (en) | 2014-09-17 |
| JPWO2011062064A1 (en) | 2013-04-04 |
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