JP3367752B2 - Linear pulse motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-phase linear pulse motor including a hybrid type linear motor, a VR type linear motor and a permanent magnet type linear motor.

[0002]

2. Description of the Related Art FIG. 15 is a vertical sectional view of a conventional well-known cylinder type linear pulse motor.

In FIG. 15, the stator cores 101, 10 of the stator 100 of the cylinder type linear pulse motor are described.
2, 103 and 104 have a stepped ring shape in which the outer peripheral edge portion is thickened in the thickness direction, and a plurality of stator small teeth 105 are axially equidistantly formed on the inner peripheral surface thereof. It is arranged. Then, these stator cores 101, 10
2, 103 and 104 are supported and framed by a frame 116.

A ring-shaped winding 106 is sandwiched in a ring-shaped groove formed by combining the stator cores 101 and 102 in such a manner that the outer peripheral edges thereof are butted against each other. Also, similarly to this, the stator cores 103 and 1
The ring-shaped winding 107 is sandwiched between the ring-shaped grooves formed between the grooves 04.

The cylinder type linear pulse motor includes the stator cores 101 and 102 and the ring winding 10.
6 forms one phase, and the stator cores 103 and 1
04 and the ring-shaped winding 107 form another one phase to form two phases as a whole. The ring-shaped permanent magnet 108 is used for the stator core 1 forming the two phases.
01 and 102 and the stator cores 103 and 104, and is magnetized in the axial direction of the moving element 109.

The mover core 110 of the mover 109 has a cylindrical shape, and a plurality of mover small teeth 111 are arranged on the outer peripheral surface of the mover core 110 facing the stator small teeth 105 at an equal pitch in the axial direction. It is set up. The mover 109 is supported by brackets 112 and 113 so as to be axially movable via bearings 114 and 115.

The stator small teeth 105 and the mover small teeth 111
And have the following positional relationship. That is, the stator core 1
The stator small teeth 105 arranged at 04 are movable small teeth 111
The stator core 103
The stator small teeth 105 disposed at the position are axially displaced from the stator core 104 by 2/4 of the tooth pitch. In addition, the stator small teeth 105 arranged on the stator core 102 have a tooth pitch of 1 compared to the stator core 104.
The position is shifted by / 4 in the axial direction. Further, the stator small teeth 105 arranged on the stator core 101 are at positions displaced from the stator core 104 by 3/4 of the tooth pitch in the axial direction.

With such a structure, the cylinder type linear pulse motor constitutes a two-phase hybrid type linear pulse motor.

However, the cylinder type linear pulse motor having the above-mentioned structure has a drawback that the winding accommodating portion cannot be made large and the number of amper conductors per phase cannot be made large, so that the thrust is low. In addition, the stator cores 101, 1
04 is the permanent magnet 10 rather than the stator cores 102 and 103.
Since it is located far from 8, the magnetic circuit is not uniform,
There was also the drawback that the thrust differs depending on the phase to be excited. Further, in principle, since the respective phases are arranged in the axial direction, the axial length of the motor becomes long, and furthermore, since the permanent magnet 108 is on the stator 100 side,
At the same time as the motor casing is required, the mover 109
However, since the axial length of the moving element 109 needs to be longer than the axial length of the stator 100, the inertia of the moving element 109 also becomes large. At the same time, there is a drawback that it is difficult to form multiple phases.

Therefore, a linear pulse motor which solves these drawbacks has been already proposed by the present inventor, and the shape of the stator iron plate forming the stator core is as follows.
It discloses as follows. That is, on the one hand, when k is a positive integer and m is the number of phases, the stator iron plate forming the stator core has 2 km of salient poles, and the salient poles are inside the stator iron plate. In the circumferential direction, m salient poles that form the tip of the stator small tooth and m salient poles that form the tooth bottom are arranged in this order to form one set, and there are k sets. It is composed of. (Japanese Patent Application No. 4-332761, Japanese Patent Application No. 4-340280)

On the other hand, k is an integer of 1 or more, m is the number of phases, and n
Is an integer of m / 2 or less and a value closest to m / 2, the stator iron plate has km salient poles, and
The tip of the salient pole facing the mover is arranged in the order of n salient poles having a small inner radius and (mn) salient poles having a large inner radius, as viewed from the mover side, to form one set. Formed, and there are k sets of them. (Patent application 5
No. 100810)

The above three proposals relate to the technique for forming a stator core of a hybrid type linear motor, in particular, a stator core forming technique similar to the above proposal is applied to a VR type linear motor or a permanent magnet type linear motor. The applied one has already been proposed by the present inventor. (Japanese Patent Application No. 5-238362, Japanese Patent Application No. 5-226784)

[0013]

However, the linear pulse motor having the above structure has the following problems. (1) Since the stator core is formed by rotationally stacking iron plates on which salient pole portions forming tooth tips and salient pole portions forming tooth bottoms are arranged at predetermined angles, the stator iron core is small. The tooth thickness and the small tooth pitch of the teeth are determined by the thickness of the iron plate and cannot be set freely. Therefore, the basic step feed amount also depends on the iron plate thickness and cannot be set freely. (2) Further, the tooth thickness / tooth pitch ratio is determined by the number of phases of the motor and cannot be freely set. (3) When the inner peripheral surfaces of the axially opposite end portions of the stator core are used as fitting portions for fitting with the end brackets,
There may be a salient pole portion that does not come into contact with the end bracket, and special means are required for uniform fitting. (4) Variations in the plate thickness of the laminated iron plates affect the accuracy of the step feed amount, and it is difficult to improve the accuracy.

The present invention has been made in view of the above points.
The purpose is to eliminate the above-mentioned problems, and to set the tooth thickness and tooth pitch of the stator small teeth arbitrarily, improve the accuracy of the step feed amount, and increase the thrust by selecting the optimum tooth thickness Linear pulse To provide a motor.

Another object of the present invention is to provide a linear pulse motor capable of making the axial length of the inner peripheral surface of the stator salient pole longer than the axial length of the winding line winding portion. It is in.

Still another object of the present invention is to provide a linear pulse motor in which end brackets can be fitted to both axial end portions of a stator salient pole.

[0017]

The structure of the present invention for achieving the above-mentioned object has a plurality of salient poles radially arranged toward the inside, and has an inner peripheral surface of each salient pole. A stator having a stator core in which a plurality of stator small teeth are formed at equal pitches in the axial direction, and a winding line wound around each salient pole, and freely movable in the axial direction in the stator. And a slider having a slider core on the outer peripheral surface facing the stator small teeth and having a plurality of slider small teeth formed at an equal pitch, or on the outer peripheral surface along the axial direction. A linear motor comprising a plurality of permanent magnet poles, which are alternately magnetized in the radial direction and have different polarities, and each of which has a rotor core arranged at an equal pitch of ½ of the stator small tooth pitch. In the pulse motor, it is as follows.

(1) The stator core includes a ring-shaped yoke portion and a plurality of salient pole portions that are individually formed, and each salient pole portion is an inner peripheral surface of the ring-shaped yoke portion. to, disposed along the circumferential direction and the axial direction, and Ri Na joined, further, the tooth pitch of the stator teeth tau, Mo
The number of data phases is m, k, and is smaller than 2m when m is an even number.
It is an odd number greater than or equal to 1 and smaller than 2 m when m is an odd number
When the integers are not 1 or more and not m, they are adjacent to each other
The stator teeth of the salient poles have a (k / 2m) τ shift in the axial direction.
It is characterized by having .

(2) Each of the stator cores is individually
A ring-shaped yoke portion formed on the inner surface and the plurality of salient pole portions
And each salient pole portion is an inner circumference of the ring-shaped yoke portion.
On the surface along the circumferential and axial directions and
And a portion around which the winding of the salient pole is wound.
The cross-sectional area of the part is the front of the surface of the salient pole facing the mover.
Smaller than the total area of the tooth tip and tooth bottom of the stator small tooth
And wherein the decoction.

(3) The stator core includes a stator core portion formed of a magnetic pole portion and a yoke portion that do not include individually formed salient pole tip portions, and a plurality of salient pole tip portions. The salient pole tip portions are arranged and joined to the magnetic pole portions of the stator core portion along the axial direction.

(4) The salient pole tip portion is formed by laminating a plurality of salient pole portion iron plates having the stator small teeth formed thereon, or is made of a member having the stator small teeth formed. Characterize.

(5) The tooth pitch of the stator small teeth is τ,
When the number of motor phases is m 1 , and k is an odd number of 1 or more smaller than 2 m when m is even, and when m is an odd number less than 1 m and smaller than 2 m, the salient poles adjacent to each other The stator small tooth of (1) is characterized by having a shift of (k / 2m) τ in the axial direction.

(6) The cross-sectional area of the portion of the salient pole where the winding line is wound is such that the tooth tip portion and the tooth bottom portion of the stator small tooth on the surface of the salient pole facing the mover. It is characterized by being smaller than the total area.

(7) Fitting portions are provided on the inner peripheral surfaces of the axially opposite ends of the salient poles to fit the end brackets that movably support the mover via bearings. And

[0025]

In the linear pulse motor configured as described above, the stator core has a plurality of salient pole portions or salient pole tip portions formed individually, and a yoke portion or a magnetic pole portion and a yoke portion, respectively. The stator small teeth can be formed by punching an iron plate, or by mechanical cutting, sintering, precision casting, or the like, because the stator small teeth are arranged and joined to the stator core formed in (4). Therefore, the tooth thickness and the tooth pitch of the stator small teeth can be set arbitrarily without depending on the iron plate thickness.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be exemplarily described in detail below with reference to the drawings. 1 is a vertical sectional view showing an embodiment of a linear pulse motor of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line II-II, and FIG. 3 is a perspective view showing the relationship between the salient pole portions of the stator core and the ring-shaped yoke portion. In this embodiment, the tooth pitch of the stator small teeth is τ, the motor phase number m and the integer k are m = 5 and k = 4, and the number of stator salient poles is 10.

In FIGS. 1, 2 and 3, the stator core 10 of the stator 1 of the linear pulse motor comprises a ring-shaped yoke 11 and ten salient pole portions 41, 42, 43 ,.
0 and the salient pole portions 41, 42, 43, ... 50
Are radially fitted and arranged inwardly in the groove 12 provided along the axial direction at an equal pitch angle on the inner peripheral surface of the ring-shaped yoke 11, and the fitted portion is welded or the like. Is integrally joined to the ring-shaped yoke 11.

The salient pole portions 41, 42, 43, ... 50
Is provided with a plurality of stator small teeth 16 (tooth tip portion 16a and tooth bottom portion 16b) arranged in the axial direction on its inner peripheral surface, and the adjacent salient pole portions 41, 42 are adjacent to each other. , 43,
The 50 stator small teeth 16 are axially (k /
2 m) τ, that is, a deviation of (4/10) τ. After the core is formed, the stator core 10 has its inner diameter finished to a desired size.

Further, each of the ten salient pole portions 41, 42, 43, ... 50 of the stator core 10 has a stator winding W1, W2, W3 ,. Has been done. The stator core 10 has the salient pole portions 41,
The inner peripheral surface (inner diameter portion) 10a of both axial end portions 42, 43, ... 50 is used as a fitting hole, and the fitting portion 17 is formed between the end brackets 17 and 18 with the frame 13 disposed therebetween.
The a and 18a are fitted to the inner peripheral surface 10a and held by screwing with a screw or the like (not shown) to form the stator 1.

On the other hand, the mover 2 disposed inside the stator 1 so as to face the stator 1 through the air gap, the mover 2 is fixed by the end brackets 17 and 18 through the bearings 19 and 20. It has the same axis as the core 10 and is movably supported in the axial direction. The moving element 2 has its axis 2
1 and magnetic pole cores 22a and 22b, and the magnetic pole core 22.
A ring-shaped permanent magnet 23 is sandwiched between a and 22b and magnetized in the axial direction.

On the outer peripheral surfaces of the magnetic pole cores 22a and 22b, a plurality of mover small teeth 24 (tooth tip part 24a and tooth bottom part 24b) are arranged facing the stator small teeth 16 at the same pitch in the axial direction. ) Are arranged, and the arrangement thereof has a relationship as shown in FIG. That is, when the addendum portion 24a of the mover small tooth 24 of the magnetic pole core 22a exactly faces the addendum portion 16a of the stator small tooth 16 of the salient pole portion 41, the mover small tooth 24 of the magnetic pole core 22b is formed. Has a tooth tip portion 24a facing the tooth bottom portion 16b of the stator small tooth 16 of the salient pole portion 41, and the movable element small teeth 24 disposed on the magnetic pole cores 22a and 22b have a tooth pitch of 1/1 of each other. The permanent magnet 2 is displaced by 2
A thickness of 3 is set.

FIGS. 4 (a), 4 (b), 4 (c), 4 (d) and 4 (e) show the salient pole portions 41, 42, 4 respectively.
FIG. 3 is a plan view showing an example of a salient pole portion iron plate constituting 3 ,. 4A shows a salient pole iron plate 51 that constitutes the salient pole portions 41 and 46, FIG. 4B shows a salient pole portion iron plate 52 that constitutes the salient pole portions 42 and 47, and FIG. ) Is salient pole part 4
It is the salient pole part iron plate 53 which comprises 3 and 48, and FIG.
Is a salient pole iron plate 54 that constitutes salient pole portions 44 and 49,
FIG. 4E shows a salient pole portion iron plate 5 which constitutes the salient pole portions 45 and 50.
It is 5.

Here, FIG. 4 (e) is an upside down relationship of FIG. 4 (b), and FIG. 4 (d) is an upside down relationship of FIG. 4 (c). 4 (e) and FIG.
4 (b), FIG. 4 (d) and FIG. 4 (c) are the same iron plate. For this reason, FIG. 4 (a), FIG. 4 (b), FIG.
The salient pole portions 41, 42, 43, ..., 50 are constituted by the three types of salient pole portion iron plates 51, 52, 53 of (c). Fitting portions 10a are provided at both axial end portions of the salient pole iron plates 51, 52, 53, and the fitting portions 10a are formed on the inner peripheral surfaces of both axial end portions of the stator core 10. ing.

FIG. 5 shows the salient pole portion 4 of the stator core 10.
FIG. 5 is a development view of the stator small teeth 16 arranged on the inner peripheral surfaces of 1, 42, 43, ...
The hatched portion indicates the tooth tip portion 16a, and the non-hatched portion indicates the tooth bottom portion 16b. Here, the fitting portion 10a is omitted for clarity. The tooth thickness ts on the inner peripheral surface of each salient pole portion 41, 42, 43, ...
Stator small teeth 16 having a tooth pitch τ are formed, and
The stator small teeth 16 of the adjacent salient pole portions are displaced from each other by 4/10 of the tooth pitch τ.

Therefore, the salient pole portions 41 and 46, 42 and 47, 43 and 48 of the stator core 10 facing each other,
Roll W1 wound around 44 and 49, 45 and 50 respectively
And W6, W2 and W7, W3 and W8, W4 and W9, and W5 and W10 are connected to form one phase, respectively, whereby a five-phase hybrid linear pulse motor can be configured. In this case, the basic movement amount for each step is 1/10 of the tooth pitch τ, and the basic movement amount can be arbitrarily set by arbitrarily setting the tooth pitch τ.

6 and 7 are perspective views showing another embodiment of the linear pulse motor of the present invention. FIG. 6 shows the stator core portion 3 of the stator core 10 which does not include the salient pole tip portion 31.
2, the stator core portion 32 is formed of a magnetic pole portion 33 and a yoke portion 34, and FIG. 7 shows the salient pole tip portion 31. The stator core portion 32 formed of the magnetic pole portion 33 and the yoke portion 34 and the salient pole tip portion 31 are individually formed, and then the shaft is formed at the center of the magnetic pole portion 33 of the stator core portion 32. The cross section formed in the axial direction at the center of the surface of the salient pole tip portion 31 opposite to the surface on which the stator small teeth 16 are formed is a trapezoid The wedge-shaped fitting portion 36 is fitted as shown in the sectional view of FIG. 8, and then the fitting portion is integrally joined by welding or the like to form the stator core 10.

In this embodiment, the stator core portion 32 is formed by laminating the core portion iron plates, and the salient pole tip portion 31 is formed.
Is a powder magnetic material formed by a sintering method. In addition, the fitting groove 35 of the magnetic pole portion 33 and the fitting portion 36 of the salient pole tip portion 31.
Is substantially the same as the axial length of the stator core portion 32, and the axial direction of the surface of the salient pole tip portion 31 facing the magnetic pole cores 22a and 22b of the mover 2 is Is longer than the axial length of the fitting portion 36. The width of the portion of the salient pole tip 31 that contacts the magnetic pole portion 33 is the same as the width of the magnetic pole portion 33.

In the case of the previous embodiment, each salient pole portion 41, 4
Stator small teeth 16 formed in 2, 43, ..., 50
The circumferential length of the salient pole portions 41, 42, 43, ...
The width is substantially the same as that of 50, and the length of the stator small teeth 16 in the circumferential direction is shortened when an attempt is made to enlarge the winding line housing portion, but in the case of the present embodiment, FIG. 6 and FIG. As can be seen from the above, the circumferential length of the stator small tooth 16 can be made longer than the width of the salient pole portions 41, 42, 43, ... It is possible to secure a large winding line storage portion without sacrificing the circumferential length.

FIG. 9, FIG. 10 and FIG. 11 are views showing still another embodiment of the linear pulse motor of the present invention.
In FIG. 9, the moving element 6 has one moving element core (magnetic pole core) 26.
FIG. 10 is a vertical sectional view of a VR type linear motor configured by a rotor shaft 21 and a rotor shaft 21, FIG. 10 is a horizontal sectional view taken along line XX of FIG. 9, and FIG. 11 is a salient pole portion 41, 42 of the stator core 10. Four
3 is a development view of the stator small teeth 16 arranged on the inner peripheral surfaces of 3, ... 9 and 10, members corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 11, the hatched portion indicates the tooth tip portion 16a, and the unhatched portion indicates the tooth bottom portion 1a.
6b is shown. Here, as in FIG. 5, the fitting portion 10a is omitted for clarity. Each salient pole portion 41, 4
The stator small teeth 16 having a tooth thickness ts and a tooth pitch τ are formed on the inner peripheral surfaces of 2, 43, ..., 46, and the stator small teeth 16 of adjacent salient pole portions have a tooth pitch of each other. It is ⅓ of τ.

Therefore, the salient pole portions 4 facing each other
By connecting the windings W1 and W4, W2 and W5, W3 and W6 wound around 1 and 44, 42 and 45, 44 and 46, respectively, to form one phase, VR of three phases
Type linear pulse motor can be constructed. In this case, the basic movement amount for each step is 1/3 of the tooth pitch τ.

FIGS. 12, 13 and 14 are views showing still another embodiment of the present invention. FIG. 12 shows a mover in which a plurality of permanent magnets 61, which are magnetized in the radial direction with different polarities alternately along the axial direction on the outer peripheral surface, are arranged at an equal pitch of 1/2 of the stator small tooth pitch. FIG. 3 is a vertical cross-sectional view of a permanent magnet type linear motor having a mover 7 including a core (magnetic pole core) 27 and a shaft 21. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 12, and FIG. 14 is the same as FIG.
3 is a development view of the state of FIG. The stator small teeth 16 of the adjacent salient pole portions are displaced from each other by ⅜ of the tooth pitch. 12 and 13, members corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted.

In this case, the windings W1, W2, W5, W6
Are connected to form one phase, and windings W3, W4, W7, W
A two-phase permanent magnet type linear pulse motor can be constructed by connecting 8 to form another phase. In this case, the basic movement amount for each step is 1/4 of the tooth pitch. In the description of FIG. 12, the mover 7 has a plurality of permanent magnet poles 61. However, this means that the outer circumference of one ring-shaped magnet has a pitch N equal to 1/2 the stator small tooth pitch.
It is possible to magnetize the poles and the S poles alternately.

Note that the technique of the present invention is not limited to the technique in the above-described embodiment, and may be implemented by means of another aspect having the same function, and the technique of the present invention can be variously modified within the scope of the above configuration. Can be changed or added.

[0045]

As is apparent from the above description, according to the linear pulse motor of the present invention, in the first to third aspects, the stator core has a plurality of individually formed cores. Since the salient pole portion or the salient pole tip portion is arranged and joined to the yoke portion or the yoke portion including the magnetic pole portion, respectively, the stator small teeth are punched with an iron plate, or machine cutting, sintering, precision casting. It can be formed by a method.
Therefore, the tooth thickness and the tooth pitch of the small teeth of the stator can be arbitrarily set, and the accuracy of the step feed amount can be improved and the thrust can be increased by selecting the optimum tooth thickness.

In the second and sixth aspects, the cross-sectional area of the portion of the salient pole around which the winding is wound is such that the tooth tip portion of the stator small tooth on the surface of the salient pole facing the mover. and so have less than the total area of the tooth gap bottom, the inner circumferential surface axial length of said stator salient poles, it can be made longer than the projecting polar axis length of the wire winding portion. Therefore, it is not necessary to consider the coil end portion in the axial length of the motor, and the motor length can be shortened without changing the stroke length.

According to a seventh aspect of the present invention, the inner peripheral surfaces of the axially opposite end portions of the salient pole are provided with fitting portions for fitting the end pieces that movably support the mover via bearings. Therefore, the end brackets can be easily fitted to both axial end portions of the stator salient pole.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a linear pulse motor of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a perspective view showing a relationship between a salient pole portion of a stator core and a ring-shaped yoke portion.

FIG. 4 (a), FIG. 4 (b), FIG. 4 (c), FIG.
(D) and FIG. 4 (e) show the salient pole portions 41, 42, 4 respectively.
FIG. 3 is a plan view of a salient pole portion iron plate that constitutes 3 ,.

FIG. 5 is a salient pole portion 41, 42, 43, ... Of the stator core 10.
It is a development view of the stator small teeth 16 arranged on the inner peripheral surface of 50 as seen from the moving element 2 side.

FIG. 6 is a perspective view showing another embodiment of the linear pulse motor of the present invention together with FIG. 7, and is a stator core portion formed by a magnetic pole portion not including a salient pole tip portion of the stator core and a yoke portion. Is shown.

FIG. 7 is a perspective view showing a salient pole tip portion.

FIG. 8 is a cross-sectional view showing fitting of a stator core portion and a salient pole tip portion.

FIG. 9 is a vertical sectional view showing still another embodiment of the linear pulse motor of the present invention.

10 is a cross-sectional view taken along line XX of FIG.

11 is a salient pole portion 41, 42 of the stator core 10 of FIG.
43, ..., 46, stator small teeth 16 arranged on the inner peripheral surface
3 is a development view of the state of FIG.

FIG. 12 is a vertical sectional view showing still another embodiment of the linear pulse motor of the present invention.

13 is a transverse sectional view taken along line XIII-XIII in FIG.

14 is a salient pole portion 41, 4 of the stator core 10 of FIG.
48 is a development view of the stator small teeth 16 arranged on the inner peripheral surfaces of 2, 43, ...

FIG. 15 is a vertical sectional view of a conventional cylinder type linear pulse motor.

[Explanation of symbols]

1 stator 2 movers 10 Stator core 10a fitting hole 11 Ring-shaped yoke 12 grooves 16 Stator small teeth 21 axis 22a, 22b, 26, 27 Magnetic pole core 23 Permanent magnet 24 mover small teeth 31 Tip of salient pole 32 Stator core 33 Magnetic pole 34 Yoke 35 Fitting groove 36 Fitting part 41, 42, 43 ... 50 salient poles 61 Permanent magnet pole k integer m Phase number

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-271240 (JP, A) JP-A-5-83923 (JP, A) JP-A 61-81167 (JP, A) JP-A 61- 180565 (JP, A) JP-A 64-19959 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 41/00-41/035

Claims (7)

(57) [Claims] 1. A plurality of salient poles radially arranged toward the inside are provided, and a plurality of stator small teeth are formed on the inner peripheral surface of each salient pole at an equal pitch in the axial direction. A stator having a stator core and windings wound around the salient poles, and an axially movably supported inside the stator, and an outer peripheral surface facing the stator small teeth. A moving element having a moving element core with a plurality of moving element small teeth formed at equal pitches, or a plurality of permanent magnets magnetized in the radial direction on the outer peripheral surface with different polarities alternately along the axial direction. A linear pulse motor comprising: a mover having mover cores whose poles are arranged at an equal pitch of ½ of the stator small tooth pitch, wherein each of the stator cores is a ring formed individually. -Shaped yoke portion and the plurality of salient pole portions, each salient pole portion The inner peripheral surface of the ring-shaped yoke portion, disposed along a circumferential direction and the axial direction, and Ri Na joined, further, the tooth pitch of the stator teeth tau, the motor phase number
m, k is an odd number of 1 or more smaller than 2m when m is an even number.
Is a number, and when m is an odd number, m that is smaller than 2m and is 1 or more.
When not an integer, fixing the salient poles adjacent to each other
Small linear teeth have a deviation of (k / 2m) τ in the axial direction . A linear pulse motor. 2. A plurality of radially arranged inner parts
Of the salient poles, and axially on the inner peripheral surface of each salient pole.
Stator core with multiple stator small teeth formed at equal pitch
And a fixed winding having windings wound around the salient poles, respectively.
A child, and when supported in the stator so as to be movable in the axial direction,
On the outer peripheral surface, facing the small teeth of the stator, at equal pitch
A transfer having a mover core formed with a plurality of mover teeth.
Pole that is alternately different on the pendulum or on the outer peripheral surface along the axial direction.
The permanent magnet poles magnetized in the radial direction are fixed
The moving element cores arranged at a half pitch of the child small tooth pitch
A linear pulse motor including a mover having
In addition , each of the stator cores has a ring shape formed individually.
A yoke portion and a plurality of salient pole portions, and each salient pole portion
On the inner peripheral surface of the ring-shaped yoke portion in the circumferential direction and
A cross-sectional area of a portion of the salient pole around which the winding is wound, which is arranged and joined along the axial direction.
Is the size of the stator on the surface of the salient pole facing the mover.
A linear pulse motor that is smaller than the total area of the tooth tip and tooth bottom . 3. A plurality of salient poles radially arranged toward the inside are provided, and a plurality of stator small teeth are formed on the inner peripheral surface of each salient pole at an equal pitch in the axial direction. A stator having a stator core and windings wound around the salient poles, and an axially movably supported inside the stator, and an outer peripheral surface facing the stator small teeth. A moving element having a moving element core with a plurality of moving element small teeth formed at equal pitches, or a plurality of permanent magnets magnetized in the radial direction on the outer peripheral surface with different polarities alternately along the axial direction. A linear pulse motor comprising: a moving element having moving element cores having poles arranged at an equal pitch of ½ of the small tooth pitch of the fixing element; A stator core portion formed of a magnetic pole portion not including a pole tip portion and a yoke portion; A linear pulse motor comprising a plurality of salient pole tip portions, each salient pole tip portion being disposed and joined along the axial direction to a magnetic pole portion of the stator core portion. . 4. The salient pole tip portion is formed by laminating a plurality of salient pole portion iron plates having the stator small teeth formed thereon, or is made of a member having the stator small teeth formed. The linear pulse motor according to claim 3. 5. The tooth pitch of the stator small teeth is τ, the number of motor phases is m 2 , and k is an odd number of 1 or more and less than 2 m when m is an even number and less than 2 m when m is an odd number. The linear pulse motor according to claim 3 , wherein when the integers are not 1 or more and m, the stator teeth of the salient poles adjacent to each other have a deviation of (k / 2m) τ in the axial direction. . 6. The cross-sectional area of a portion of the salient pole on which the winding is wound is determined by determining an area between a tooth tip portion and a tooth bottom portion of the stator small tooth on a surface of the salient pole facing the mover. The linear pulse motor according to claim 3 , wherein the linear pulse motor is smaller than the total of 7. A fitting portion for fitting an end bracket that movably supports the mover via a bearing is provided on inner peripheral surfaces of both axial ends of the salient pole. The linear pulse motor according to claim 3 .