CN102804567A

CN102804567A - Linear motor

Info

Publication number: CN102804567A
Application number: CN2010800242640A
Authority: CN
Inventors: 伊藤一将; 中山美佐; 山口信一; 仲兴起
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2009-06-04
Filing date: 2010-05-27
Publication date: 2012-11-28
Anticipated expiration: 2030-05-27
Also published as: TW201108568A; CN102804567B; TWI441423B; KR101258790B1; KR20120009483A; JPWO2010140534A1; DE112010002248T5; JP5398830B2; WO2010140534A1

Abstract

Provided is a linear motor, wherein the dimension of a base section of magnets can be suppressed from becoming larger, even when the dimension of the magnets, along a straight line that is perpendicular to the direction the magnets are lined up, and that is parallel to an opposing face of an armature-core facing the magnets, is made to be larger than the dimension of the armature-core along this straight line. The linear motor is provided with: a field system (1) that is equipped with the base section (3), and multiple magnets (4) lined-up on this base section (3); and an armature (2) that is equipped with the armature-core (5) that faces the magnets (4), and that moves along the direction in which the magnets (4) are lined up. The whole area of the opposing face of the armature-core (5) faces the magnets (4), when viewed along the direction in which the magnets (4) are lined up; and each of the magnets (4) adjacent to each other have the centers thereof deviate from the center of the armature-core (5), in mutually different directions; and mounting holes (3a) are formed on the base section (3), at areas located in directions opposite the deviating directions of the magnets (4), when viewed along a direction perpendicular to the opposing face (5a).

Description

Linear motor

Technical field

The present invention relates to a kind of linear motor with excitation division and armature relative with this excitation division.

Background technology

At present, known a kind of linear motor, it has: the base portion that excitation division, this excitation division have the plate shape reaches and this base portion a plurality of magnet arranged side by side; Armature, this armature and above-mentioned excitation division relatively are provided with, and have the armature core relative with magnet and be arranged on the coil on this armature core, and move (for example, with reference to patent documentation 1) along magnet direction arranged side by side.

On base portion, on the both ends of following straight line, be formed with a plurality of installing holes along magnet direction arranged side by side, above-mentioned straight line is perpendicular to magnet direction arranged side by side, and is parallel to the opposite face of the armature core relative with magnet.Interspersed fastening bolt in these installing holes, excitation division is installed on the support unit.

The prior art document

Patent documentation 1: Japan special table 2000-501274 communique

Send and increase for making with the amount of the magnetic flux of armature core interlinkage from magnet; Consider to make along the size of the magnet of straight line bigger than the size along the armature core of this straight line, above-mentioned straight line is perpendicular to magnet direction arranged side by side and be parallel to the opposite face of the armature core relative with magnet.

But; Under this situation, bigger for making than size along the armature core of this straight line along the size of the magnet of straight line, must increase along the size between the installing hole of this straight line; Wherein, above-mentioned straight line is perpendicular to magnet direction arranged side by side and be parallel to the opposite face of the armature core relative with magnet.

Its result becomes big, the problem that exists linear motor to maximize along the size of the base portion of this straight line.

Summary of the invention

The present invention provides a kind of linear motor, the amount from the magnetic flux of magnet with the armature core interlinkage is increased, and can suppress to maximize.

Linear motor of the present invention has: excitation division, this excitation division have base portion and reach and be listed in a plurality of magnet on this base portion; Armature; This armature has the armature core relative with said magnet and is arranged on the coil on this armature core; And the said magnet in edge direction arranged side by side moves with respect to said excitation division; When observing along said magnet direction arranged side by side; The Zone Full of the opposite face of the said armature core relative with said magnet is relative with said magnet, when observing perpendicular to the direction of said opposite face, the straight line that the part in a plurality of said magnet is intersected along the direction arranged side by side with respect to said magnet with respect to said armature core to a direction stagger and an end outstanding from said armature core; Remaining magnet with respect to said armature core to stagger with a said direction in the opposite direction and an end outstanding from said armature core; On said base portion, the edge with staggering of said magnet direction in the opposite direction leave the zone of said magnet, be formed with installing hole.

The effect of invention

Linear motor of the present invention; When magnet direction arranged side by side was observed, Zone Full and the magnet of the opposite face of armature core were relative, along perpendicular to the direction observation of the opposite face of the armature core relative with magnet the time; The straight line that a part in a plurality of magnet is intersected along the direction arranged side by side with respect to magnet with respect to armature core to a direction stagger and an end outstanding from armature core; Remaining magnet with respect to armature core to the rightabout of a direction stagger and an end outstanding from armature core, on base portion, the edge with staggering of said magnet the direction in the opposite direction zone of leaving said magnet be formed with installing hole; Therefore; Make along the size of the magnet of straight line greatlyyer than the size along the armature core of this straight line, wherein, above-mentioned straight line is perpendicular to magnet direction arranged side by side and be parallel to the opposite face of the armature core relative with magnet; Thereby the amount from the magnetic flux of magnet with the armature core interlinkage is increased; And the size that can suppress base portion becomes big situation, and can suppress the maximization of linear motor.

Description of drawings

Fig. 1 is the vertical view of the linear motor of expression execution mode 1 of the present invention.

Fig. 2 is the front view of the linear motor of presentation graphs 1.

Fig. 3 is that the size of size and armature core of expression magnet is along the end view of the key position of the linear motor under the equal situation of the A direction of Fig. 1.

Fig. 4 is the end view of key position of the linear motor of presentation graphs 1.

Fig. 5 is the vertical view of variation of the linear motor of expression execution mode 1 of the present invention.

Fig. 6 is the vertical view of the linear motor of expression execution mode 2 of the present invention.

Fig. 7 is the figure of increment rate of back electromotive force of the linear motor of expression execution mode 3 of the present invention.

Fig. 8 is the vertical view of the linear motor of expression execution mode 4 of the present invention.

Fig. 9 is the stereogram of the linear motor of expression execution mode 5 of the present invention.

Figure 10 is the cutaway view of observing along the X-X line direction of Fig. 9.

Figure 11 is the stereogram of the relative magnet of presentation graphs 9 along the linear motor of A direction under the situation that same direction staggers.

Figure 12 is the cutaway view of observing along the XII-XII line direction of Figure 11.

Figure 13 is the vertical view of excitation division of the linear motor of expression execution mode 6 of the present invention.

Embodiment

Below, based on description of drawings each execution mode of the present invention, but in each figure, identical or suitable parts, the position identical Reference numeral of mark are described.

Execution mode 1

Fig. 1 is the vertical view of the linear motor of this execution mode of expression, and Fig. 2 is the front view of the linear motor of presentation graphs 1.

The linear motor of this execution mode has excitation division 1 and the armature 2 relative with this excitation division 1.

Excitation division 1 has the base portion 3 of writing board shape and along straight line equally spaced and be listed in a plurality of magnet 4 on the base portion 3.Each magnet 4 all forms identical rectangular shape.

Armature 2 has the armature core 5 relative with magnet 4 and is arranged on the coil 6 on this armature core 5.

Armature 2 is directed device (not shown) supporting, and this guiding device guides armature 2 along magnet 4 directions arranged side by side under the state of the gap lengths that the distance between armature 2 and the excitation division 1 is remained regulation.

Armature core 5 is magnetized through the energising of coil 6.Armature 2 is utilized in the magnetic force that produces between armature core 5 and the magnet 4, moves with respect to excitation division 1 along magnet 4 directions arranged side by side.

Base portion 3 is made up of iron.In addition, base portion 3 is not limited to iron, so long as can be got final product by the material of magnetizes on every side.

Magnet 4 disposes with the mutual different mode of adjacent magnetic pole.

In this execution mode, will be along a direction of following straight line as the A direction, that is, be the moving direction of armature 2 and the straight line that is parallel to the opposite face 5a of the armature core 5 relative with magnet 4 perpendicular to magnet 4 directions arranged side by side.In addition, in other embodiments too.

The length direction of each magnet 4 is along the A direction.The size L2 ratio along the A direction of each magnet 4 is big along the size L1 of the armature core 5 of A direction.

When observing perpendicular to the direction of opposite face 5a, adjacent magnet 4 with respect to armature core 5 along the A direction identical amount that staggers round about each other.In addition, the offset of adjacent magnet 4 also can be inequality.

Because each magnet 4 is with respect to the armature core 5 identical amount that staggers, so when observing perpendicular to the direction of opposite face 5a, an end 4a of each magnet 4 is outstanding equably from armature core 5 along the A direction.In addition, an end 4a of each magnet 4 is not limited to along the A direction outstanding, when observing perpendicular to the direction of the opposite face 5a of armature core 5, as long as give prominence to from armature core 5 with the straight line that magnet 4 directions arranged side by side are intersected on the edge.

The other end 4b of each magnet 4 and along the end of the armature core 5 of A direction when observing perpendicular to the direction of opposite face 5a, be on the same straight line of magnet 4 direction arranged side by side.

Therefore, when magnet 4 directions arranged side by side were observed, the Zone Full of the opposite face 5a of armature core 5 was relative with magnet 4.

In addition, when observing perpendicular to the direction of opposite face 5a, the other end 4b of each magnet 4 also can be outstanding from armature core 5.But under this situation, the overhang of the other end 4b is littler than the overhang of an end 4a.

On base portion 3, a plurality of installing hole 3a that fastening bolt (not shown) interts avoid each magnet 4 ground and form.The fastening bolt that excitation division 1 is interted in installing hole 3a is installed on the support unit (not shown).

When observing perpendicular to the direction of opposite face 5a, the edge that this installing hole 3a is formed on base portion 3 with staggering of magnet 4 direction in the opposite direction leave in the zone of magnet 4.In addition, when observing perpendicular to the direction of opposite face 5a, the straight line between an end 4a of the part of this installing hole 3a and the outstanding side of passing each magnet 4 is compared, and gets into the inboard of base portion 3 along the A direction.

Thus, no matter whether big than size L1 along the armature core 5 of A direction along the size L2 of the magnet 4 of A direction, can both suppress to become big along the size L3 between the installing hole 3a of A direction.

Next, to making along the size L2 of the magnet 4 of A direction than effect that produce describes along the size L1 of the armature core 5 of A direction is big.

Fig. 3 be the size L1 of size L2 and armature core 5 of expression magnet 4 along the end view of the key position of the linear motor under the equal situation of A direction, Fig. 4 is the end view of key position of the linear motor of presentation graphs 1.

Under the situation that the size L1 of the size L2 of magnet 4 and armature core 5 equates along the A direction, from the magnetic flux in the zone of the magnet 4 relative with the end of armature core 5 with armature core 5 interlinkage ground arrival base portion 3.

Relative with it, in the linear motor of this execution mode,, increase with the amount of the magnetic flux of armature core 5 interlinkages from the magnetic flux and armature core 5 interlinkages in the zone of the magnet 4 relative with the end of armature core 5.

Consequently, the back electromotive force that produces in the coil 6 is increased.

Next, the maximum defluxion D that produces in the base portion 3 of the linear motor of this execution mode is described.

Between excitation division 1 and armature 2, attractive through magnetic interaction.Thus, base portion 3 along the pars intermedia of A direction to armature 2 deflections.

When only considering the mutual region facing of excitation division 1 and armature 2; The attraction of effect is applying to approximate equality load between excitation division 1 and the armature 2 in the gamut between the installing hole 3a of A direction; Therefore, the maximum defluxion D of base portion 3 calculates through following formula (1).

D∝(w×L34)/(384×E×I) (1)

Here, w is a load per unit of length, and E is the longitudinal elastic coefficient of base portion 3, and I is a cross sectional moment of inertia.

In addition, w is the scaled value that acts on the unit length of attraction and gravity between excitation division 1 and the armature 2.In addition, E is the coefficient by the material decision of base portion 3.

In above-mentioned formula (1), I is by the decision of the cross sectional shape of base portion 3, under the situation in rectangle cross section, uses the thickness h and the width b of base portion 3 to calculate through following formula (2).

I＝(1/12)×b×h3 (2)

With the above-mentioned formula of above-mentioned formula (2) substitution (1), thereby obtain following formula (3).

D∝(w×L34)/(384×E×b×h3) (3)

Can know that from above-mentioned formula (3) L3 is big more, maximum defluxion D is big more.Can think that maximum defluxion D increases, then excitation division 1 rubs with armature 2, and at least one side of excitation division 1 and armature 2 can damage.

In linear motor in the past,,, must increase the thickness h of base portion 3 so become big in order to suppress maximum defluxion D owing to become big along the size L3 between the installing hole 3a of A direction.

Therefore, in linear motor in the past, excitation division 1 maximizes, and it is big that the weight of linear motor becomes.

Relative with it; In the linear motor of this execution mode; Owing to can suppress to become big, under the situation of the thickness h that has reduced base portion 3, also can be designed to and linear motor maximum defluxion D about equally in the past along the size L3 between the installing hole 3a of A direction.

Specifically, in linear motor in the past, under the situation of L3=50mm, h=10mm; In the linear motor of this execution mode; Under the situation of L3=40mm, when h=7.4mm, become base portion 3 maximum defluxion D about equally with in the past linear motor.

Like this, owing to can reduce the thickness h of base portion 3,, in addition, can realize the lightweight of linear motor so can be used in the space miniaturization that linear motor is set.

As stated; Linear motor according to this execution mode; When observing perpendicular to the direction of opposite face 5a, the part in a plurality of magnet 4 staggers and an end 4a is outstanding from armature core 5 to the A direction with respect to armature core 5, and remaining magnet staggers and an end 4a is outstanding from armature core 5 to the rightabout of A direction with respect to armature core 5; On base portion 3; The edge with staggering of magnet 4 the direction in the opposite direction zone of leaving magnet 4 be formed with installing hole 3a, therefore, make along the size L2 of the magnet 4 of A direction bigger than size L1 along the armature core 5 of A direction; Can make from amount to increase with the magnetic flux of the magnet 4 of armature core 5 interlinkages, thereby and the size L3 that can suppress base portion 3 become the maximization that can suppress linear motor greatly.

In addition, under base portion 3 is tabular situation, owing to can suppress to become big along the size L3 between the installing hole 3a of A direction, so need not reduce the maximum defluxion D of base portion 3, its result, the thickness h that can suppress base portion 3 becomes big.

In addition because the direction rightabout each other that staggers separately of each other adjacent magnet 4, so each installing hole 3a can be configured in along the moving direction of magnet 4 each magnet 4 near.

Consequently, installing hole 3a is equally spaced formed along the moving direction of armature 2.In addition, can form installing hole 3a morely.

In addition, when observing perpendicular to the direction of opposite face 5a, the other end 4b of magnet 4 and be in along on the same straight line of magnet 4 direction arranged side by side along the end of the armature core 5 of A direction, so, can make along the size L3 between the installing hole 3a of A direction minimum.

In addition; In this execution mode; The size linear motor bigger than the size along equidirectional of armature 2 along magnet 4 direction arranged side by side for excitation division 1 is illustrated; But being not limited thereto, also can be the size linear motor littler than the size along equidirectional of armature 2 along magnet 4 direction arranged side by side of excitation division 1.

In addition, in this execution mode, each installing hole 3a is illustrated along near the linear motor that the moving direction of magnet 4 is configured in each magnet 4, but as shown in Figure 5, also can reduces the quantity of installing hole 3a.

Execution mode 2

Fig. 6 is the vertical view of the linear motor of this execution mode of expression.

In the linear motor of this execution mode, excitation division 1 has a plurality of group of magnets 7 that are made up of 2 magnet 4 arranged side by side.

When the edge was observed perpendicular to the direction of the opposite face 5a of armature core 5, group of magnets 7 staggered along the A direction with respect to armature core 5.That is to say that each magnet 4 of group of magnets 7 staggers to equidirectional each other, when the edge was observed perpendicular to the direction of the opposite face 5a of armature core 5, an end 4a of each magnet 4 was outstanding from armature core 5.

When observing perpendicular to the direction of opposite face 5a, adjacent group of magnets 7 with respect to armature core 5 along the A direction identical amount that staggers round about each other.In addition, the offset of adjacent group of magnets 7 also can be different.

When observing perpendicular to the direction of opposite face 5a, be formed on installing hole 3a on the base portion 3 be formed on the edge with staggering of group of magnets 7 direction in the opposite direction leave the zone of group of magnets 7.

Other structures are identical with execution mode 1.

As stated, according to the linear motor of this execution mode since in identical each magnet 4 of direction that staggers a part is adjacent each other at least arbitrarily, so can change the pulse frequency that acts on excitation division 1 and armature 2 along the power of A direction.

Its result can avoid using the natural frequency of the mechanical device of linear motor.

In addition, in this execution mode, the group of magnets 7 that is made up of 2 magnet 4 arranged side by side is illustrated, but also can is the group of magnets 7 that constitutes by the magnet more than 34 arranged side by side.

Execution mode 3

Fig. 7 is the figure of increment rate of back electromotive force of the linear motor of this execution mode of expression.In addition, in Fig. 7, will calculate as 0% along the situation that the size L1 of the armature core 5 of A direction equates with size L2 along the magnet 4 of A direction.Dotted line shown in Figure 7 is to be used for the consult straight line that the linearity of figure line to the expression back electromotive force compares.

In the linear motor of this execution mode; When observing perpendicular to the direction of the opposite face 5a of armature core 5, an end 4a of magnet 4 is below 5 times of gap lengths gap between excitation division 1 and the armature 2 from armature core 5 outstanding outstanding length (L2-L1).

Other structures are identical with execution mode 1.

In addition, also can be identical with execution mode 2.

As shown in Figure 7; Is under the situation below 500% in the outstanding length (L2-L1) of magnet 4 with respect to the ratio of gap lengths gap, and the increment rate of the back electromotive force that produces in the coil 6 roughly is directly proportional with the outstanding length (L2-L1) of magnet 4 ratio with respect to gap lengths gap.

Under the outstanding length of magnet 4 situation big with respect to the ratio of gap lengths gap 500%, even further increase outstanding length (L2-L1), back electromotive force also can increase hardly.

This is because even increase outstanding length (L2-L1), also do not leak with armature core 5 interlinkages from the magnetic flux of magnet 4.

In addition, when observing perpendicular to the direction of the opposite face 5a of armature core 5, an end 4a of preferred especially magnet 4 is below 3 times of gap lengths gap between excitation division 1 and the armature 2 from armature core 5 outstanding outstanding length (L2-L1).

As stated; Linear motor according to this execution mode; When observing perpendicular to the direction of opposite face 5a; Because an end 4a of magnet 4 is below 5 times of gap lengths gap between excitation division 1 and the armature 2 from armature core 5 outstanding outstanding length (L2-L1),, can increase the back electromotive force that produces in the coil 6 through increasing outstanding length (L2-L1) with producing effect.

Execution mode 4

Fig. 8 is the vertical view of the linear motor of this execution mode of expression.

In the linear motor of this execution mode, magnet 4 is with respect to the angle tilt of A direction with regulation.

Other structures are identical with execution mode 1.

In addition, also can be identical with execution mode 2 or execution mode 3.

According to the linear motor of this execution mode, because magnet 4 is with respect to the angle tilt of A direction with regulation, so can reduce cogging torque.

Execution mode 5

Fig. 9 is the stereogram of the linear motor of this execution mode of expression, and Figure 10 is the cutaway view of observing along the X-X line direction of Fig. 9.

The linear motor of this execution mode has relative each other a pair of excitation division 1 and is arranged on the armature 2 between each excitation division 1.

Armature 2 is relative with each excitation division 1.

The base portion 3 that each excitation division 1 and execution mode 1 likewise have a writing board shape with and be listed in a plurality of magnet 4 on this base portion 3.

In each excitation division 1, the identical each other direction of direction that magnet 4 is arranged side by side.

With execution mode 1 likewise, will be along a direction of following straight line as the A direction, that is, perpendicular to magnet 4 direction arranged side by side and be parallel to the straight line of the opposite face 5a of the armature core 5 relative with magnet 4.

Each magnet 4 of relative excitation division 1 each other relatively.In addition, each magnet 4 of relative excitation division 1 staggers along the A direction with respect to armature core 5 each other round about, and when the edge was observed perpendicular to the direction of the opposite face 5a of armature core 5, an end 4a of each magnet 4 was outstanding from armature core 5.

When observing perpendicular to the direction of opposite face 5a, each excitation division 1 the edge of base portion 3 with staggering of magnet 4 direction in the opposite direction leave in the zone of magnet 4 and be formed with installing hole 3a.

Other structures are identical with execution mode 1.

In addition, other structures also can with execution mode 2 to execution mode 4 in any one identical.

Below, the power along the A direction that acts on armature core 5 in the linear motor of this execution mode is described.

On armature core 5, effect has the attraction that is produced by magnet 4.When the edge is observed perpendicular to the direction of opposite face 5a, stagger along the A direction with respect to the center of armature core 5 in the center of magnet 4, so shown in figure 10, in each magnet 4, the direction of the attraction that magnet 4 produces tilts to the A direction from the direction perpendicular to opposite face 5a.

But, owing to each relative magnet 4 staggers along the A direction each other round about, so each magnet 4 attracts the component along the A direction of the attraction of armature cores 5 to be cancelled.

Therefore, armature core 5 is attracted by magnet 4 and being suppressed along the mobile of A direction of causing.

Relative with it, shown in figure 11, each relative magnet 4 along the A direction each other under the situation that equidirectional staggers, shown in figure 12, each magnet 4 attracts the component along the A direction of the attraction of armature cores 5 not to be cancelled.

Because the direction that staggers each other of adjacent magnet 4 is opposite direction, so, be under the situation of even number for example with armature core 5 relative magnet 4, each magnet 4 attracts the component along the A direction of the attraction of armature core 5 to be cancelled.

But, with armature core 5 relative magnet 4 be under the situation of odd number, each magnet 4 attracts the component along the A direction of the attraction of armature cores 5 not to be cancelled fully and residue is arranged.

Its result acts on armature core 5 and having along the power of A direction.

As stated; According to the linear motor of this execution mode, excitation division 1 relatively is provided with a pair of each other, and armature 2 is set between each excitation division 1; The magnet 4 of each excitation division 1 each other relatively; The direction that staggers of each relative magnet 4 is mutually opposite direction each other, so, can offset the component that each relative magnet 4 attracts the attraction of armature core 5 along the A direction.

Execution mode 6

Figure 13 is the vertical view of excitation division 1 of the linear motor of this execution mode of expression.

In the linear motor of this execution mode, excitation division 1 also has the housing 8 that covers magnet 4 with base portion 3.

Thus, can suppress to accompany between excitation division 1 and the armature 2 situation of foreign matter.In addition, can prevent that foreign matter from contacting with magnet 4.

On housing 8, be formed with the through hole 8a that is communicated with the installing hole 3a of base portion 3.

Fastening bolt (not shown) is interted in through hole 8a and installing hole 3a, and excitation division 1 is installed on the support unit (not shown).

Housing 8 is made up of the aluminium as nonmagnetic substance.In addition, housing 8 is not limited to aluminium, also can be made up of austenitic stainless steel or plastics etc.

Thus, can prevent that magnet 4 from contacting with fastening bolt.In addition, can prevent that fastening bolt and housing 8 from attracting each other.In addition, can make magnetic flux pass through housing 8 and armature core 5 interlinkages from magnet 4.

In addition, housing 8 preferably is made up of plastics.Plastics are compared with iron etc., form through hole 8a easily.

As stated, according to the linear motor of this execution mode, owing to have the housing 8 that covers magnet 4 with base portion 3 in addition; So when being installed in excitation division 1 on the support unit, fastening bolt is also attracted by magnet 4; Prevent that fastening bolt from contacting with magnet 4, can suppress magnet 4 and damage.

The explanation of Reference numeral

1 excitation division, 2 armatures, 3 base portions, 3a installing hole, 4 magnet, 4a one end, 4b the other end, 5 armature cores, 5a opposite face, 6 coils, 7 group of magnets, 8 housings, 8a through hole.

Claims

1. linear motor is characterized in that having:

Excitation division, said excitation division have base portion and reach and be listed in a plurality of magnet on this base portion;

Armature, said armature have the armature core relative with said magnet and are arranged on the coil on this armature core, and move with respect to said excitation division along said magnet direction arranged side by side,

When observing along said magnet direction arranged side by side, the Zone Full of the opposite face of the said armature core relative with said magnet is relative with said magnet,

When the edge is observed perpendicular to the direction of said opposite face; The straight line that part edge in a plurality of said magnet and said magnet direction arranged side by side are intersected with respect to said armature core to a direction stagger and an end outstanding from said armature core; Remaining magnet with respect to said armature core to stagger with a said direction in the opposite direction and an end outstanding from said armature core; On said base portion, the edge with staggering of said magnet direction in the opposite direction leave in the zone of said magnet and be formed with installing hole.

2. linear motor as claimed in claim 1 is characterized in that, each other the direction rightabout each other that staggers separately of adjacent said magnet.

3. linear motor as claimed in claim 1 is characterized in that, at least a portion in identical each the said magnet of the direction that staggers is adjacent each other.

4. like each described linear motor in the claim 1～3; It is characterized in that; When observing perpendicular to the direction of said opposite face, the other end of said magnet and be in along on the same straight line of said magnet direction arranged side by side perpendicular to the end of the said armature on the direction of said magnet direction arranged side by side.

5. like each described linear motor in the claim 1～4; It is characterized in that; When observing perpendicular to the direction of said opposite face, a said end of said magnet is below 5 times of gap lengths between said excitation division and the said armature from the outstanding outstanding length of said armature core.

6. like each described linear motor in the claim 1～5, it is characterized in that,

Said excitation division relatively is provided with a pair of each other,

Said armature is set between each said excitation division,

The said magnet of each said excitation division is relative each other, each other the direction rightabout each other that staggers of each relative said magnet.

7. like each described linear motor in the claim 1～6, it is characterized in that said excitation division also has the housing that covers said magnet with said base portion.