JP2005039883A - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology which makes a reduction of a magnetic flux leakage and a thin structure. <P>SOLUTION: A linear motor includes a plurality of flat magnetic pole teeth having opposed flat magnetic pole surfaces linearly arranged through a nonmagnetic region or nonmagnetic member from each other, and a flat exciting coil disposed at plainly deviated position from the flat magnetic pole surfaces of the plurality of the flat magnetic pole teeth. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an armature configuration of a linear motor.
[0002]
[Prior art]
As conventional techniques related to the present invention, for example, Japanese Unexamined Patent Application Publication No. 2002-142437 (Patent Document 1), Japanese Unexamined Patent Application Publication No. 2002-027731 (Patent Document 2), Japanese Unexamined Patent Application Publication No. 2002-027729 (Patent Document 3). And those described in JP-A-2002-125360 (Patent Document 4). Japanese Patent Application Laid-Open No. 2002-142437 discloses a magnetic protrusion formed of a magnetic material along a moving direction of a mover of a linear motor as a mover of a linear motor that cancels out a magnetic attractive force between the mover and the stator. And a magnetic concave portion formed of a nonmagnetic material are alternately provided, and a magnetoresistive difference is generated between the convex portion and the concave portion. In JP-A-2002-027731 and JP-A-2002-027729, in order to shorten the total length of the coil side of the linear motor, the winding part is used as a core around which the coil is wound. And a core in which a winding portion is formed on the lower surface of a permanent magnet are arranged next to each other. Japanese Patent Laid-Open No. 2002-125360 discloses a linear motor for reducing magnetic attraction generated between an armature and a mover by reducing leakage of magnetic flux passing through a gap between armature magnetic pole teeth. The opposing magnetic poles of the magnetic pole teeth in the G-shaped split core are different from each other between adjacent magnetic pole teeth, and a mover is disposed between the opposing magnetic pole faces, and the mover on the split core overlaps with the mover in a plane. A configuration in which an exciting coil is arranged at a position is described.
[0003]
[Patent Document 1]
JP 2002-142437 A [Patent Document 2]
JP 2002-027731 A [Patent Document 3]
JP 2002-027729 A [Patent Document 4]
Japanese Patent Laid-Open No. 2002-125360
[Problems to be solved by the invention]
Among the above-described conventional techniques, the technique described in Japanese Patent Application Laid-Open No. 2002-142437 is not a technique for reducing magnetic flux leakage between magnetic pole teeth on the stator (armature) side. The techniques described in Japanese Unexamined Patent Application Publication No. 2002-027729 and Japanese Patent Application Laid-Open No. 2002-125360 each have a configuration in which an excitation coil is disposed on a split core at a position that overlaps the mover in a planar manner. The motor is difficult to form.
An object of the present invention is to reduce magnetic flux leakage between magnetic pole teeth on the armature side and to make it possible to construct a thin linear motor in view of the state of the prior art.
An object of the present invention is to provide a technique capable of solving such problems.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, basically, as a linear motor, a plurality of flat magnetic pole teeth having opposed flat magnetic pole surfaces of an armature are separated from each other with a nonmagnetic region therebetween. Or it is set as the structure which arranged in a straight line through the nonmagnetic member, and arranged the flat excitation coil in the position which shifted | deviated planarly from the said flat magnetic pole surface of these magnetic pole teeth. The non-magnetic region or the non-magnetic member magnetically separates the plurality of magnetic pole teeth to suppress magnetic flux leakage between the magnetic pole teeth, and increases or decreases the amount of magnetic flux between the flat magnetic pole surfaces. To prevent it.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 are explanatory views of a first embodiment of the present invention. 1 is a diagram showing a basic configuration of the linear motor of the present invention, FIG. 2 is an exploded view of the linear motor of FIG. 1, and FIG. 3 is a flow of magnetic flux in the magnetic pole teeth of the armature of the linear motor of FIG. 4 and 4 are configuration examples of the linear motor according to the first embodiment of the present invention.
[0007]
In FIG. 1, 4 is a flat exciting coil constituting the armature, 6 is a flat movable element having a configuration in which the magnetic poles of the magnet are alternately changed in the moving direction, and 11a ₁ and 11a _2. flat magnetic pole teeth which are opposed to each _other, 11b _1, 11b ₂ flat magnetic pole teeth also facing each _other, 12a _1, 12a ₂ flat magnetic pole teeth also facing each _other, 12b _1, 12b ₂ is also flat facing each other The magnetic pole teeth 53a ₁₁ and 53a ₂₁ are arranged opposite to each other, and are flat non-magnetically separating the magnetic pole teeth 11a ₁ and 12a ₁ and the magnetic pole teeth 11a ₂ and 12a ₂ magnetically. The magnetic members 53a ₁₂ and 53a ₂₂ are arranged to face each other, and are flat nonmagnetic members that magnetically separate the magnetic pole teeth 12a ₁ and 11b ₁ from each other and the magnetic pole teeth 12a ₂ and 11b ₂ 53b ₁₁ 53b ₂₁ are arranged to face each other, and are flat nonmagnetic members that magnetically separate the magnetic pole teeth 11b ₁ and 12b ₁ from each other and the magnetic pole teeth 11b ₂ and 12b ₂ ; 11a ₁ , 11a ₂ root side portion, 51b is a magnetic pole tooth 11b ₁ , 11b ₂ root side portion, 52a is a magnetic pole tooth 12a ₁ , 12a ₂ root side portion, 52b is a magnetic pole tooth 12b ₁ , 12b ₂ root side Part.
[0008]
Flat magnetic pole teeth 11a ₁ , 11a ₂ and their root side portions 51a, flat magnetic pole teeth 11b ₁ and 11b ₂ and their root side portions 51b, flat magnetic pole teeth 12a ₁ and 12a ₂ and their root side portions 52a , And the flat magnetic pole teeth 12b ₁ , 12b ₂ and the base side portion 52b thereof are each made of a magnetic material such as electromagnetic soft iron and form an armature core. The magnetic pole teeth 11a ₁ , 11a ₂ , the magnetic pole teeth 11b ₁ , 11b ₂ , the magnetic pole teeth 12a ₁ , 12a ₂ , and the magnetic pole teeth 12b ₁ , 12b ₂ are arranged substantially in a straight line along the moving direction of the mover 6. The first portion {circle around (1)} in which the flat magnetic pole surface is formed in the opposed portion, and the movable element 6 is disposed between the flat magnetic pole surfaces, and the second portion {circle around (2)} in which the exciting coil 4 is disposed. With. In each of the magnetic pole teeth, the first portion (1) and the second portion (2) are formed at positions shifted so as not to overlap each other in a plane. In the second portion {circle around (2)} of the magnetic pole teeth, the windings of the flat exciting coil 4 are commonly linked, and magnetic poles having different polarities with respect to the arrangement direction of the magnetic pole teeth are formed. Excited so that.
[0009]
The nonmagnetic members 53a ₁₁ , 53a ₂₁ , 53a ₁₂ , 53a ₁₂ , 53b ₁₁ , 53b ₂₁ are provided to suppress leakage of magnetic flux between the magnetic pole teeth on both sides. The nonmagnetic member 53a ₁₁ mainly suppresses the leakage of magnetic flux between the magnetic pole teeth 11a ₁ and 12a ₁ , the first portion {circle around (1)} of the magnetic pole teeth 11a ₁ and the magnetic pole teeth 11a ₂ , and the magnetic pole teeth 12a ₁ and the magnetic pole teeth 12a. _The nonmagnetic member 53a ₂₁ mainly prevents the magnetic pole teeth 11a ₂ and 12a ₂ from increasing or decreasing the amount of magnetic flux between the flat magnetic pole surfaces formed in the first part (1) of the _two . The magnetic flux leakage between the magnetic pole teeth 11a ₁ and the first portions (1) of the magnetic pole teeth 11a ₂ and the first portions (1) of the magnetic pole teeth 12a ₁ and the magnetic pole teeth 12a ₂ are flat. Prevents the amount of magnetic flux between the magnetic pole faces from increasing or decreasing. The non-magnetic member 53a ₁₂ mainly suppresses leakage of magnetic flux between the magnetic pole teeth 12a ₁ and 11b _1, and the first portion (1) of the magnetic pole teeth 12a ₁ and the magnetic pole teeth 12a ₂ and the magnetic pole teeth 11b ₁ and the magnetic pole teeth 11b. _The nonmagnetic member 53a ₂₂ mainly prevents the magnetic pole teeth 12a ₂ and 11b ₂ from increasing or decreasing the amount of magnetic flux between the flat magnetic pole surfaces formed in each of the first portions {circle around (1)}. suppressing the leakage of magnetic flux between, are formed in the respective magnetic pole teeth 12a ₁ of the first portion of the magnetic pole teeth 12a ₂ ▲ 1 ▼ and the first portion of the magnetic pole teeth 11b ₁ and the magnetic pole teeth 11b ₂ ▲ 1 ▼ It prevents the amount of magnetic flux between the flat magnetic pole faces from being increased or decreased. Similarly, the nonmagnetic member 53b ₁₁ mainly suppresses the leakage of magnetic flux between the magnetic pole teeth 11b ₁ and 12b _1, and the first portion {circle around (1)} of the magnetic pole teeth 11b ₁ and the magnetic pole teeth 11b ₂ and the magnetic pole teeth 12b ₁ The first portion {circle around (1)} of the magnetic pole teeth 12b ₂ is prevented from increasing or decreasing the amount of magnetic flux between the respective flat magnetic pole surfaces, and the non-magnetic member 53b ₂₁ is mainly composed of the magnetic pole teeth 11b ₂ and 12b ₂ . suppressing the magnetic flux leakage between, between the first magnetic pole tooth 11b ₁ and the magnetic pole teeth 11b ₂ 1 part ▲ 1 ▼ and magnetic pole teeth 12b ₁ and the magnetic pole tooth 12b ₂ 1 part ▲ 1 ▼ each flat pole face Prevents the amount of magnetic flux from being increased or decreased. It should be noted that some or all of these nonmagnetic members 53a ₁₁ , 53a ₂₁ , 53a ₁₂ , 53a ₁₂ , 53b ₁₁ , 53b ₂₁ are not provided, and a nonmagnetic region is provided between the magnetic pole teeth. You may make it provide the space | gap as.
[0010]
FIG. 2 is an exploded view of the linear motor of FIG. The non-magnetic members 53a ₁₁ , 53a ₂₁ , 53a ₁₂ , 53a ₁₂ , 53b ₁₁ , 53b ₂₁ are integrally formed (in FIG. 2, the non-magnetic members 53a ₁₂ , 53a ₁₂ in FIG. 1 are illustrated. Abbreviated).
[0011]
3 is a diagram showing the flow of magnetic flux in the magnetic pole teeth of the armature unit of the linear motor of FIG.
In FIG. 3, reference numerals 61 to 64 denote directions of currents to be supplied to the exciting coil 4 (FIG. 1), and reference numerals 71 to 74 denote the flow of magnetic flux generated in the magnetic pole teeth 11a ₁ and 11a ₂ by the supplied current. The arrows 75 to 78 are arrows indicating the flow of magnetic flux generated in the magnetic pole teeth 12a ₁ and 12a ₂ by the energization current. The current flows from 61 to 62, 63, 64. In the magnetic pole teeth 11a ₁ and 11a ₂ , the second portion {circle around (2)} (L portion) of the magnetic pole teeth 11a ₂ is excited in linkage with the winding of the exciting coil 4 (FIG. 1), and arrows 71 to 74 are excited. Magnetic flux that flows in the direction of An arrow 74 indicates the direction of magnetic flux flow between the flat magnetic pole surfaces of the first portion {circle around (1)} of the magnetic pole teeth 11a ₁ and 11a ₂ . In the magnetic pole teeth 12a ₁ and 12a ₂ , the second portion {circle around (2)} (U portion) of the magnetic pole teeth 12a ₁ is excited in linkage with the winding of the exciting coil 4 (FIG. 1). Generate magnetic flux in the direction of ~ 78. An arrow 78 indicates the direction of magnetic flux flow between the flat magnetic pole surfaces of the first portion {circle around (1)} of the magnetic pole teeth 12a ₁ and 12a ₂ . As indicated by arrows 74 and 78, the direction of magnetic flux flow between the flat magnetic pole surfaces of the first portion {circle around (1)} of the magnetic pole teeth 11a ₁ , 11a ₂ and the first of the magnetic pole teeth 12a ₁ , 12a ₂ . The direction of the flow of magnetic flux between the flat magnetic pole faces of the portion {circle around (1)} is opposite to each other. As a result, the flat magnetic pole surface of the first portion {circle around (1)} of the magnetic pole teeth 11a ₁ and 11a ₂ and the flat magnetic pole surface of the first portion {circle around (1)} of the magnetic pole teeth 12a ₁ and 12a ₂ are mutually polar. Different magnetic poles are generated.
[0012]
In the configuration of FIG. 3, since the nonmagnetic members 53a ₁₁ and 53a ₂₁ (FIG. 1) are interposed between the magnetic pole teeth 11a ₁ and 11a ₂ and the magnetic pole teeth 12a ₁ and 12a ₂ , The magnetic resistance between the magnetic circuits is large. For this reason, the leakage of the magnetic flux generated at each magnetic pole tooth to the counterpart magnetic circuit is prevented. As a result of preventing the leakage, the amount of magnetic flux in the magnetic circuit of each magnetic pole tooth is ensured, and the amount of magnetic flux between the flat magnetic pole surfaces of each first portion (1) is increased or decreased. It is blocked and a predetermined amount is secured. Although not shown in FIG. 3, it is also between the magnetic pole teeth 12a ₁ and 12a ₂ and the magnetic pole teeth 11b ₁ and 11b ₂ and between the magnetic pole teeth 11b ₁ and 11b ₂ and the magnetic pole teeth 12b ₁ and 12b _2. The same as above.
[0013]
4A and 4B are configuration examples of the linear motor according to the first embodiment of the present invention, in which FIG. 4A is a perspective view and FIG. 4B is an AA cross-sectional view. The first embodiment is a configuration example when the two motor units having the basic configuration shown in FIG. 1 are arranged in series in the moving direction of the mover.
[0014]
In FIG. 4, reference numerals 100 and 101 denote motor units, 11′a ₁ , 11′a ₂ , 12′a ₁ , 12′a ₂ , 11′b ₁ , 11′b ₂ , 12′b ₁ , 12′b _2. Are the flat magnetic pole teeth constituting the core of the armature in the motor unit 101, 4 ′ is the flat exciting coil in the motor unit 101, and τ _S is in the armature of each of the motor units 100 and 101. Is a pitch between adjacent magnetic pole teeth (hereinafter referred to as an armature magnetic pole tooth pitch), τ _m is a pitch between adjacent magnetic poles in the mover 6 (hereinafter referred to as a mover magnetic pole pitch), and τ is an electric machine The magnetic pole pitch is equal to the child magnetic pole tooth pitch τ _S or the mover magnetic pole pitch τ _m . Here, in each motor unit 100, 101, the armature magnetic pole tooth pitch τ _S and the mover magnetic pole pitch τ _m may be the same, but to suppress the pulsation of the moving thrust generated in the mover 6 by the armature. It is also possible to set the values different from each other. The motor unit 100 and the motor unit 101 have the same configuration as each other, and both have the basic configuration shown in FIG. 1 including the nonmagnetic member. Between the motor units 100 and 101, when the interval between the magnetic pole teeth of the armature is k, an integer of 0, 1, 2,..., M is the number of motor phases and is an integer of 2 or more, k · τ + τ / m. As a result, even when a current of the same phase is applied to the motor unit 100 and the motor unit 101, the movable element 6 can be moved and displaced by generating a thrust in a predetermined direction. The same applies when three or more motor units having the same basic configuration are provided in series. The mover 6 is supported between the armature core and the armature core by the support means 200a, 200b, and 200c so as to be movable in a predetermined direction.
[0015]
According to the first embodiment, as a linear motor, motor efficiency can be improved by reducing magnetic flux leakage between magnetic pole teeth on the armature side by a non-magnetic member, and a flat exciting coil is formed into a flat shape. With respect to the magnetic pole teeth, a thin configuration can be achieved because the magnetic pole teeth are provided so as to be interlinked in common at positions shifted from the flat magnetic pole surface at the position of the mover.
[0016]
5A and 5B are configuration example diagrams of a linear motor according to a second embodiment of the present invention, in which FIG. 5A is a perspective view and FIG. 5B is a BB cross-sectional view. The second embodiment is a configuration example in which two motor units having the basic configuration shown in FIG. 1 are arranged in parallel in the moving direction of the mover.
[0017]
5, the motor unit _{100,102, 11''a 1, 11''a 2,} 12''a 1, 12''a 2, 11''b 1, 11''b 2, 12 '' b ₁ and 12 ″ b ₂ are flat magnetic pole teeth constituting the armature core in the motor unit 102, 4 ″ is a flat exciting coil in the motor unit 102, and τ _S is a motor The pitch between adjacent magnetic pole teeth in the armatures of the units 100 and 101, that is, the armature magnetic pole tooth pitch, τ _m is the pitch between adjacent magnetic poles in the mover 6, that is, the mover magnetic pole pitch, τ is The magnetic pole pitch is equal to the armature magnetic pole tooth pitch τ _S or the mover magnetic pole pitch τ _m . Here, in each motor unit 100, 102, the armature magnetic pole tooth pitch τ _S and the mover magnetic pole pitch τ _m may be the same, but as with the first embodiment, the armature provides the mover 6 with the armature. In order to suppress the pulsation of the generated moving thrust, different values can be used. Furthermore, in the second embodiment, the movable element pole pitch tau _m, and the movable element portion 6a of the motor unit 100 side, only the tau / 2 together with the movable element 6b of the motor unit 102 side shifted, the movable element The pulsation of the moving thrust generated at 6 can be further reduced. The motor units 100 and 102 have the same basic configuration as each other, and all include the configuration shown in FIG. 1 including a nonmagnetic member. The same applies when three or more motor units having the same basic configuration are provided in parallel. The mover 6 is supported between the armature core and the armature core so as to be movable in a predetermined direction by the support means 200 ″ a and others.
[0018]
Also according to the second embodiment, as a linear motor, the non-magnetic member can reduce magnetic flux leakage between the magnetic pole teeth to improve the motor efficiency, and the flat exciting coil is planar with the flat magnetic pole surface. A thin configuration can be obtained by providing the magnetic pole teeth in common at the positions displaced from each other.
[0019]
FIG. 6 is a diagram showing another configuration example of the mover used in the linear motor of the present invention. In this configuration example, as the mover 6 ′, convex portions 16 and flat portions 13 are alternately provided in the moving direction, and the difference in magnetic resistance with respect to the armature core between the convex portions 16 and the flat portions 13 is provided. To occur. For example, the convex portion 16 and the flat portion 13 may be made of a magnetic material such as electromagnetic soft iron, or a magnet may be provided on the flat portion.
The present invention is not limited to a linear motor, but can be applied to a vibration type linear actuator in which a mover relatively reciprocates.
[0020]
【The invention's effect】
According to the present invention, motor efficiency can be improved. Moreover, a thin linear motor can be formed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a basic configuration of a linear motor of the present invention.
FIG. 2 is an exploded view of the linear motor of FIG.
3 is a diagram showing the flow of magnetic flux in the magnetic pole teeth of the linear motor of FIG. 1. FIG.
FIG. 4 is a diagram showing a configuration of a linear motor as a first embodiment of the present invention.
FIG. 5 is a diagram showing a configuration of a linear motor as a second embodiment of the present invention.
FIG. 6 is a diagram showing another configuration example of the mover used in the linear motor of the present invention.
[Explanation of symbols]
4, 4 ′, 4 ″... Exciting coil 6, 6 ′ mover 11 a ₁ , 11 a ₂ , 11 b ₁ , 11 b ₂ , 12 a ₁ , 12 a ₂ , 12 b ₁ , 12 b ₂ , 11 ′ a ₁ , 11′a ₂ , 12′a ₁ , 12′a ₂ , 11′b ₁ , 11′b ₂ , 12′b ₁ , 12′b ₂ , 11 ″ a ₁ , 11 ″ a ₂ , 12 ″ _{a 1, 12''a 2, 11''b 1} , 11''b 2, 12''b 1, 12''b 2 ... magnetic pole _{teeth, 53a 11, 53a 21, 53a} 12, 53a 22, 53b 11 , 53b ₂₁ ... nonmagnetic member, 51a, 51b, 52a, 52b ... base side part, 100, 101, 102 ... motor unit, 200a, 200b, 200c, 200''a ... support means.

Claims (4)

A linear motor that moves the mover linearly with a magnetic field generated by armature magnetic pole teeth,
A plurality of magnetic pole teeth arranged in a straight line, each having a flat magnetic pole surface facing each other, and arranged with a nonmagnetic region between each other in the arrangement direction;
The windings are linked to the plurality of magnetic pole teeth in common at a position shifted in a plane from the flat magnetic pole surface, and magnetic poles having different polarities with respect to the arrangement direction are formed on the magnetic pole teeth. A flat excitation coil that excites as
A linear motor comprising: a flat movable element arranged between the flat magnetic pole faces of the magnetic pole teeth and moved and displaced by a magnetic field between the magnetic pole faces. A linear motor that moves the mover linearly with a magnetic field generated by armature magnetic pole teeth,
A plurality of magnetic pole teeth arranged in a straight line and having flat magnetic pole faces facing each other;
The windings are linked to the plurality of magnetic pole teeth in common at a position shifted in a plane from the flat magnetic pole surface, and magnetic poles having different polarities with respect to the arrangement direction are formed on the magnetic pole teeth. A flat excitation coil that excites as
A nonmagnetic member disposed between the plurality of magnetic pole teeth;
A flat movable element disposed between the flat magnetic pole faces opposed to the magnetic pole teeth and moved and displaced by a magnetic field between the magnetic pole faces, and leakage of magnetic flux between the magnetic pole teeth on which the different magnetic poles are formed. A linear motor characterized in that the plurality of magnetic pole teeth can be excited while being suppressed by the non-magnetic member. The plurality of magnetic pole teeth, when τ is the pitch of the magnetic pole of the mover, k is an integer of 0, 1, 2,. The linear motor according to claim 1, wherein the linear motor has a configuration of k · τ + m / τ. The plurality of magnetic pole teeth are arranged in the same phase when τ is a magnetic pole pitch of the mover, k is an integer of 0, 1, 2,. 3. The linear motor according to claim 1, wherein the pitch is k · τ and the arrangement pitch of magnetic pole teeth of different phases is k · τ + m / τ.

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