JP2007185033A - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor whose reliability and assembling workability can be improved. <P>SOLUTION: Magnetic pole teeth 31 have yoke portions 31b located at the backside of the side facing a stator 2 and that contact adjacent teeth 31 and tooth portions 31c formed protrusively from the yoke portions 31b to the side facing the stator 2. Also, the magnetic pole teeth 31 are provided with a first magnetic pole tooth 311 and a second magnetic pole tooth 312. The first magnetic pole tooth 311 has a first projection portion 311a formed protrusively from the end surface of the yoke portion in the motor drive direction. The second magnetic pole tooth 312 has a second cutout portion 312b that is formed by cutting out the end surface of the yoke portion in the motor drive direction and that contacts the first projection portion 311a of the first magnetic pole tooth 311. A plurality of magnetic pole teeth 31 are integrally coupled by making coupling members 33 engage with engagement portions 34 provided at the backside of the magnetic pole teeth. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a linear motor having high reliability and good assemblability.

  A conventional linear motor has a configuration in which magnetic pole teeth are individually separated in order to perform winding with high density. Then, a winding is wound around each magnetic teeth, and the individual magnetic teeth that have been wound are used by engaging the concave portions and the convex portions provided on the respective magnetic teeth, and engaging the dovetail groove and the coupling member. In addition, the coupling member is assembled by being fixed to a fixing member (armature mounting plate) with a screw (for example, see Patent Document 1).

JP 2000-217334 A (page 3, FIG. 1, FIG. 4)

  In the above-described conventional linear motor, there are many places where the individual magnetic teeth are engaged when assembling the armature, and in particular, when engaging the concave portions and the convex portions provided on the magnetic teeth, the magnetic teeth are inserted by sliding. Therefore, it is necessary to fix them together, resulting in poor assembly workability. Further, in this case, there is a problem that the coil wound around the magnetic teeth by the slide comes into contact and is rubbed, which may cause insulation failure or disconnection, resulting in a decrease in reliability.

  In addition, magnetic pole teeth are generally manufactured by laminating press-punched electromagnetic steel sheets, so when the motor capacity is increased and the width of the magnetic teeth is increased, the thickness of the magnetic steel sheets increases, resulting in errors due to lamination. As a result, the magnetic teeth are inclined and the assemblability is deteriorated. Furthermore, it is necessary to increase the thickness of the press die (lower die) as the stacking thickness increases, which increases the cost of the die and increases the cost of the magnetic teeth.

  Even when the magnetic teeth are not a steel sheet laminated structure, it is necessary to change the width of the magnetic teeth according to the motor capacity, which is a factor that hinders the efficiency in production and parts management.

  The present invention has been made to solve the above-described problems, and can improve the reliability and assembly workability in a structure in which a plurality of magnetic pole teeth are connected and fixed. An object of the present invention is to provide a linear motor that can reduce costs by improving the efficiency of production of magnetic teeth and parts management.

  A linear motor according to a first aspect of the present invention is a stator yoke extending in the motor driving direction, and a plurality of permanent magnets arranged on the stator yoke at predetermined intervals along the motor driving direction and having different polarities alternately. And a plurality of magnetic pole teeth arranged with a predetermined distance from the stator permanent magnet and sequentially arranged along the motor driving direction, and a drive coil provided on the magnetic pole teeth. The linear motor is composed of an armature, and the magnetic teeth are located on the back side of the surface facing the stator and are in contact with the adjacent magnetic teeth, and from the yoke portion to the side facing the stator. The magnetic pole teeth include a first magnetic pole tooth and a second magnetic pole tooth disposed adjacent to the first magnetic pole tooth. End of yoke part The second magnetic pole teeth are formed by cutting out from the end face of the yoke portion in the motor driving direction, and the first magnetic pole teeth are formed in the first magnetic pole teeth. A linear notch having a second notch that abuts against the protrusion of the magnetic pole teeth, and a plurality of magnetic pole teeth are connected and integrated by engaging a connecting member with an engaging portion provided on the back surface of the magnetic pole teeth. motor.

  A linear motor according to a second aspect of the present invention is a stator yoke extending in the motor driving direction, and a plurality of permanent magnets arranged on the stator yoke at predetermined intervals along the motor driving direction and having different polarities alternately. And a plurality of magnetic pole teeth arranged with a predetermined distance from the stator permanent magnet and sequentially arranged along the motor driving direction, and a drive coil provided on the magnetic pole teeth. The linear motor is composed of an armature, and the magnetic teeth are located on the back side of the surface facing the stator and are in contact with the adjacent magnetic teeth, and from the yoke portion to the side facing the stator. The magnetic pole teeth include a first magnetic pole tooth and a second magnetic pole tooth disposed adjacent to the first magnetic pole tooth, and the tooth portion of the first magnetic pole tooth. And the second magnet The main coil teeth are formed by winding a drive coil around one of the teeth of the teeth, the auxiliary pole teeth are formed without winding the drive coil on either of the teeth, and the engaging portion provided on the back surface of the magnetic teeth A linear motor characterized in that a plurality of magnetic teeth are connected and integrated by engaging a connecting member.

  According to the linear motor according to the first aspect of the invention, the magnetic pole teeth are divided, so that the winding can be performed with high density. In addition, since the armature can be assembled by connecting and integrating a plurality of magnetic pole teeth by a simple method of engaging the connecting members, the production efficiency can be improved. Further, since the first projecting portion of the first magnetic teeth and the second notch portion of the second magnetic teeth are in contact with each other, it is difficult for the magnetic teeth to be displaced and gaps, cogging, torque ripple, etc. It is possible to prevent the deterioration of the characteristics.

  According to the linear motor according to the second aspect of the invention, the magnetic pole teeth are divided so that the winding can be performed with high density. In addition, since the armature can be assembled by connecting and integrating a plurality of magnetic pole teeth by a simple method of engaging the connecting members, the production efficiency can be improved. Furthermore, since the drive coil is wound only on one of the teeth of the first magnetic teeth and the teeth of the second magnetic teeth, the number of winding and connection processes is halved compared to the conventional method. And productivity can be improved. Further, since the magnetic teeth around which the drive coil is wound are not adjacent to each other, the insulation between the coils is not necessary, and the insulation reliability can be improved.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

Embodiment 1 FIG.
1A and 1B show the configuration of a linear motor according to Embodiment 1 of the present invention, in which FIG. 1A is a plan view, FIG. 1B is a cross-sectional view taken along line II of FIG. FIG. 3 is a perspective view showing a step of sequentially arranging the magnetic pole teeth in FIG. 1 and connecting and integrating them with the connecting member, and FIG. 4 shows a step of fixing the connecting member and the magnetic pole teeth by welding. FIG. 5 is a front view for explaining in more detail the welding procedure between the connecting member and the magnetic teeth, and FIG. 6 is a cross-sectional view showing the configuration of the armature 3 of another linear motor according to Embodiment 1 of the present invention. FIG.

  In FIG. 1, a stator 2 has a plate-like stator yoke 21 extending in a motor driving direction (in the direction of a double-headed arrow in the figure), and a predetermined interval on the stator yoke 21 along the motor driving direction. And a plurality of permanent magnets 22 and 23 having different polarities alternately. The armature 3 is arranged around the permanent magnets 22 and 23 of the stator 2 with a predetermined interval, and is wound around each of the magnetic pole teeth 31 and a plurality of magnetic pole teeth 31 sequentially arranged along the motor driving direction. The driving coil 32 and a connecting member 33 that connects and integrates the plurality of magnetic teeth 31 are configured.

  In FIG. 1B, the upper portion of the magnetic pole teeth 31 shown in the figure is a yoke portion 31b, and a tooth portion 31c is formed projecting downward from the yoke portion 31b. A drive coil 32 is provided around each tooth portion 31c. Is wound.

  The magnetic pole tooth 31 includes a first magnetic pole tooth 311 and a second magnetic pole tooth 312 disposed adjacent to the first magnetic pole tooth 311. The first magnetic pole teeth 311 are formed so as to protrude in the motor driving direction at the lower end face of the yoke portion 31b, and extend to the position of the tooth portions of the adjacent second magnetic pole teeth 312; The upper end surface of the yoke 31b has a first notch 311b that is notched in the motor drive direction from the first protrusion 311a. The second magnetic pole teeth 312 are formed in the motor drive direction from the second protrusion 312a formed to protrude in the motor driving direction at the upper end surface of the yoke portion 31b and from the second protrusion 312a in the lower end surface of the yoke portion 31b. It has the 2nd notch part 312b which is notched. And the 1st protrusion part 311a and the 1st notch part 311b of the 1st magnetic pole tooth 311 which adjoin, the 2nd notch part 312b and the 2nd protrusion part 312a of the 2nd magnetic pole tooth 312 Are in contact with each other.

  As shown in FIG. 2, the back surface of the yoke portion 31b of each magnetic pole tooth 31 has a rectangular cross section (width) in a predetermined position (two locations here) along the motor driving direction (in FIG. 2, the direction perpendicular to the paper surface). A recess 31a having a width W1 and a depth H2 is formed, and a recess 31a having a width W1 / 2 and a depth H2 is formed at both ends. And as shown in FIG. 3, the groove-shaped engaging part 34 is formed because this recessed part 31a continues over several yoke parts 31b.

  The connecting member 33 engages over the entire length of the groove-shaped engaging portion 34, and the magnetic pole teeth 31 are integrally connected. As shown in FIG. 1, a screw hole 33 a for attachment to a driven portion (not shown) is formed at a predetermined position of the connecting member 33.

  Next, the assembly process of the armature 3 of the linear motor according to Embodiment 1 of the present invention configured as described above will be described with reference to the drawings.

  First, the drive coil 32 is wound around each magnetic pole tooth 31. Then, as shown in FIG. 3, the magnetic teeth 31 are connected to the end surfaces of the yoke portions 31b, that is, the first protrusion 311a and the first notch 311b of the first magnetic teeth 311. Then, the second magnetic pole teeth 312 are aligned by bringing the second notch 312b and the second protrusion 312a into contact with each other. Due to this alignment, the concave portions 31a formed on the back surface of the yoke portion 31b of the magnetic pole teeth 31 are connected to form the engaging portion 34. Next, as shown in FIG. 4, after engaging the connecting member 33 with the engaging portion 34, welding is performed, and the connecting member 33 is fixed to the yoke portion 31 b of each magnetic pole tooth 31. And by this adhering, each magnetic teeth 31 are connected and integrated through the connecting member 33, and the armature 3 is completed.

  Here, the welding procedure shown in FIG. 4 will be described in more detail with reference to FIG. As shown in FIG. 5, the relationship between the height H1 of the connecting member 33 and the depth H2 of the engaging portion 34 (concave portion 31a) is important. Since heat shrinkage occurs in the welded portion P, if the connecting member 33 warps due to this heat shrinkage, the problem is that the facing surface of the magnetic pole teeth 31 connected and integrated by the connecting member 33, particularly the stator 2, is distorted. Occurs.

  Therefore, the depth H2 of the engaging portion 34 is slightly smaller than 1/2 (H1 / 2) of the height H1 of the connecting member 33 so that the welded portion P is positioned at the center of the connecting member 33 in the height direction. It is desirable to set.

  When H2 <H1 / 2 is set, there is a possibility that the welding point P is slightly below the center position in the height direction of the connecting member 33 depending on the welding operation. In this case, the connecting member 33 tends to warp upward due to the influence of welding, but the magnetic pole teeth 31 connected to the connecting member 33 are in contact with each other at their ends. Therefore, the distortion of the facing surface of the magnetic pole teeth 31 facing the stator 2 is sufficiently small compared to the case where the welding point P is shifted upward from the center and the connecting member 33 is warped upward. There is an advantage that there is almost no real harm.

  As described above, according to the present embodiment, each coupling member 33 is engaged with the engaging portion 34 formed by connecting the concave portions formed on the back surface of the yoke portion 31 b of each magnetic pole tooth 31. Since the magnetic pole teeth 31 are connected and integrated, the assembly of the armature 3 is not troublesome, and the assembly workability can be improved. In addition, since adjacent coils are not brought into contact with each other and rubbed together, there is no risk of poor insulation or disconnection, and reliability can be improved.

  When the connecting member 33 is fixed to the engaging portion 34 by welding, the depth H2 of the engaging portion 34 is made smaller than 1/2 of the height H1 of the connecting member 33 (H2 <H1 / 2). In addition, since the warpage of the connecting member 33 can be suppressed and the influence of the warpage can be reduced, the correction work for the warpage is not required, and the assembly workability can be further improved.

  Further, the first protrusion 311a and the first notch 311b of the first magnetic pole tooth 311 are brought into contact with the second notch 312b and the second protrusion 312a of the second magnetic pole tooth 312. Since they are aligned, it is difficult for the magnetic teeth 31 to be displaced and gaps, and characteristics such as cogging and torque ripple can be prevented from being deteriorated.

  The shape and size of the first protrusion 311a and the first notch 311b of the first magnetic pole tooth 311 and the second notch 312b and the second protrusion 312a of the second magnetic pole tooth 312 are shown. For example, as shown in FIG. 6, the same effect can be obtained with a tapered protrusion 311 a and a notch 312 b, or a tapered protrusion 312 a and a notch 311 b as shown in FIG. 6. can get.

Embodiment 2. FIG.
7 shows a configuration of a linear motor according to Embodiment 2 of the present invention, (A) is a plan view, (B) is a sectional view taken along line II-II in (A), and FIG. 8 is a diagram of the linear motor in FIG. 2 is a perspective view showing an armature 3. FIG. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  The magnetic pole teeth 31 constituting the armature 3 of the linear motor according to the second embodiment are, as shown in the drawing, the first magnetic pole teeth 311 and the second magnetic pole teeth disposed between the first magnetic pole teeth 311. A tooth 312 and a third magnetic pole tooth 313 disposed at the end are provided. The third magnetic pole teeth 313 are driven from the third protrusion 313a formed in the motor drive direction at the upper end face of the yoke 31b and from the third protrusion 313a at the lower end of the yoke 31b. It has the 3rd notch part 313b notched in the direction. And the 3rd protrusion part 313a and the 3rd notch part 313b of the 3rd magnetic pole tooth 313, and the 1st notch part 311b and the 1st protrusion part 311a of the 1st magnetic pole tooth 311 mutually It comes to contact with.

  In the first embodiment, the drive coil 32 is wound around each magnetic pole tooth 31, but in the present second embodiment, the drive coil 32 is wound only on the tooth portion 311c of the first magnetic pole tooth 311 and the second The drive coil 32 is not wound around the magnetic pole teeth 312 and the third magnetic pole teeth 313.

  In such a configuration, the first magnetic pole tooth 311 around which the drive coil 32 is wound serves as a main pole tooth, and the second magnetic pole tooth 312 around which the drive coil 32 is not wound suppresses cogging and torque ripple. It becomes a supplementary teeth for. The third magnetic pole teeth 313 serve as auxiliary teeth that reduce end cogging.

  Then, the magnetic teeth 31 are connected to the end surfaces of the yoke portions 31b, that is, the first protrusion 311a and the first notch 311b of the first magnetic teeth 311 and the second magnetic teeth. The second notch 312b and the second protrusion 312a of the 312 are brought into contact with each other, and the first protrusion 311a and the first notch 311b of the first magnetic pole tooth 311 and the third magnetic pole The third notch 313b and the third protrusion 313a of the teeth 313 are brought into contact with each other to be aligned. Thereafter, as in the first embodiment, the connecting member 33 is engaged with the engaging portion 34 formed by connecting the concave portions 31a provided in the magnetic pole teeth 31, and welding is performed as shown in FIG. By fixing the member 33 to the yoke portion 31 b of each magnetic pole tooth 31, each magnetic pole tooth 31 is connected and integrated via the connecting member 33, and the armature 3 is completed.

  As described above, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained.

  FIG. 9A is a cross-sectional view showing a case where the drive coil 32 is wound around each magnetic pole tooth 31, and FIG. 9B is a cross-sectional view showing a case where the drive coil 32 is wound only around the first magnetic pole tooth 311. According to the present embodiment, the drive coil 32 is wound only around the first magnetic pole tooth 311 as shown in FIG. 9B, so that the winding and connection processes are performed as compared with the case of FIG. 9A. The number can be halved, and productivity can be improved. In addition, when it winds only to the 1st magnetic pole tooth 311 of Fig.9 (a), it can wind twice as much as the case where it winds to each magnetic pole tooth 31 of FIG.9 (b), and linearly can be given. The total output (thrust) of the motor is equal.

  Further, according to the present embodiment, as shown in FIG. 9B, since the drive coils 32 are not adjacent to each other, insulation between the coils becomes unnecessary, and insulation reliability can be improved.

  Furthermore, according to the present embodiment, as shown in FIG. 9B, when winding the teeth 311c of the first magnetic pole teeth 311 with high density, the protrusions provided on the first magnetic pole teeth 311 are provided. The drive coil 32 can be wound along the lower end of the part 311a, and the winding workability can be improved.

  Further, as shown in FIG. 10, the length in the motor driving direction contacting the connecting member 33 of each yoke portion 31 b of the first magnetic pole tooth 311, the second magnetic pole tooth 312, and the third magnetic pole tooth 313 is L1, In the case of L2 and L3, if the ratio of L1, L2 and L3 is formed to be approximately 1: 1: 1, the balance of the welding positions with respect to the magnetic pole teeth 31 is improved, and the reliability of joining is improved. In addition, the driving direction lengths of the recesses 31a provided in the magnetic pole teeth 31 can be equalized by the magnetic pole teeth 31, and the connecting member 33 and the individual magnetic pole teeth 31 can be engaged with an equal force. Can be improved.

  In the linear motor of the above-described embodiment, the first magnetic pole teeth 311 are formed to protrude in the motor driving direction at the lower end surface of the yoke portion 31b and extend to the teeth of the adjacent second magnetic pole teeth 312. It has the 1st notch part 311b notched in the motor drive direction from the 1st protrusion part 311a in the 1st protrusion part 311a and the yoke part 31b end surface upper part. The second magnetic pole teeth 312 are motor driven from the second projecting portion 312a formed to project in the motor driving direction at the upper end surface of the yoke portion 31b and from the second projecting portion 312a at the lower end surface of the yoke portion 31b. It has the 2nd notch part 312b notched in the direction. Further, the third magnetic pole teeth 313 are driven from the third protrusion 313a formed in the motor driving direction at the upper end face of the yoke part 31b and from the third protrusion 313a at the lower end face of the yoke part 31b. It has the 3rd notch part 313b notched in the direction. However, the present invention is not limited to such a configuration, and as shown in FIG. 11A, the yoke portion 31b of the first magnetic pole tooth 311 is formed so as to protrude in the motor driving direction, and the adjacent second magnetic pole teeth 312 are formed. The yoke portion 31b of the second magnetic pole teeth 312 and the third magnetic pole teeth 313 is formed to have the same width as its own tooth portion, and extends to the position of the tooth portion. The drive coil 32 may be wound only around the tooth portion 311c of the tooth 311 and the drive coil 32 may not be wound around the second magnetic pole tooth 312 and the third magnetic pole tooth 313.

  In this case, since the drive coil 32 is wound only on the first magnetic teeth 311, the number of winding and connection processes can be halved as compared with the case where the magnetic coils 31 are wound. Can be improved. Further, since the drive coils 32 are not adjacent to each other, insulation between the coils is not necessary, and insulation reliability can be improved. Further, when winding the tooth portion 311c of the first magnetic pole tooth 311 with high density, the drive coil 32 can be wound along the lower end of the protruding yoke portion 31b of the first magnetic pole tooth 311. Thus, the winding workability can be improved.

  Further, as shown in FIG. 11B, the yoke portions 31b of the first magnetic pole teeth 311, the second magnetic pole teeth 312 and the third magnetic pole teeth 313 are formed so as to protrude in the motor driving direction and are adjacent to each other. The yoke portions 31b are in contact with each other, and the drive coil 32 is wound only on the tooth portion 311c of the first magnetic pole tooth 311, and the drive coil 32 is wound on the second magnetic pole tooth 312 and the third magnetic pole tooth 313. You may make it the structure which is not.

  In this case, since the drive coil 32 is wound only on the first magnetic teeth 311, the number of winding and connection processes can be halved as compared with the case where the magnetic coils 31 are wound. Can be improved. Further, since the drive coils 32 are not adjacent to each other, insulation between the coils is not necessary, and insulation reliability can be improved.

Embodiment 3 FIG.
12 is a plan view showing the configuration of the linear motor according to Embodiment 3 of the present invention, FIG. 13 is a perspective view showing the armature of the linear motor of FIG. 12, and FIG. 14 is a drive coil on the first magnetic pole tooth of FIG. It is a perspective view which shows the process of winding. In the figure, the same parts as those in the second embodiment are given the same reference numerals and the description thereof is omitted.

  As shown in FIG. 12, the stator 2 according to the third embodiment is configured by arranging two rows of permanent magnets 22 and 23 on a stator yoke 21. Each magnetic pole tooth 31 constituting the armature 3 is composed of two unit magnetic pole teeth 4 arranged in a direction orthogonal to the motor driving direction. The drive coil 32 is wound only around the two unit magnetic pole teeth 4 constituting the first magnetic pole teeth 311. That is, as shown in FIG. 14, two unit magnetic pole teeth 4 constituting the first magnetic pole teeth 311 are installed on the winding jig 5, and the magnet wire 6 is wound while rotating in the arrow direction in the figure. To do. As a result, the two unit magnetic pole teeth 4 are tightened and integrated by the drive coil 32.

  In the third embodiment, each magnetic pole tooth 31 is made the same as in the second embodiment, the end surfaces of the respective yoke portions 31b, that is, the first protrusion 311a and the first protrusion of the first magnetic pole tooth 311. The first notch 311b, the second notch 312b of the second magnetic pole tooth 312 and the second protrusion 312a are brought into contact with each other, and the first protrusion 311a of the first magnetic pole tooth 311 and The first notch 311b, the third notch 313b of the third magnetic pole tooth 313, and the third protrusion 313a are brought into contact with each other to be sequentially aligned. By this alignment, the recesses 31d provided in the magnetic pole teeth 31 are connected to each other to form a groove-like engaging portion 34d, and between the rows of the unit magnetic pole teeth 4, both the unit magnetic pole teeth 4 are formed by the both recesses 31e formed at the ends. A groove-like engaging portion 34e is formed between each of them. The magnetic teeth 31 are connected and integrated via the connecting members 33 by engaging the connecting members 33 with the groove-like engaging portions 34d and 34e, respectively, and welding at predetermined positions. 3 is completed.

  As described above, according to the present embodiment, the same effects as those of the second embodiment can be obtained, and two unit magnetic pole teeth 4 are arranged in a direction orthogonal to the motor driving direction. It is possible to respond to changes in the required thrust (motor capacity) of the motor, and it is possible to divert the same parts as well as improve the assembly workability, and parts management etc. are facilitated, thus reducing costs. Can do.

  In particular, when the magnetic pole teeth 31 are manufactured by laminating magnetic steel plates, which are magnetic plates, even if the motor capacity is increased, the production is performed for each unit magnetic pole teeth 4, so that the stacking thickness of the steel plates is within a certain limit, The press mold becomes inexpensive, and the tilting due to the lamination is suppressed, and the productivity is improved. Further, if the plurality of unit magnetic pole teeth 4 are stacked while being reversed, the fall of the entire magnetic pole teeth can be further reduced.

  Moreover, since the groove-shaped engaging part 34e straddling between both unit magnetic pole teeth 4 is formed, and the connection member 33 is engaged with this engaging part 34e, integration is further strengthened and further reliability is improved. Can be achieved.

  In the above description, the two unit magnetic pole teeth 4 are arranged in a direction orthogonal to the motor driving direction and integrated. However, the number of unit magnetic pole teeth 4 is not limited to two but three. It may be above.

Embodiment 4 FIG.
15 is a plan view showing the configuration of the linear motor according to Embodiment 4 of the present invention, FIG. 16 is a side view showing the configuration of the linear motor in FIG. 15, and FIG. 17 is a front view showing the configuration of the linear motor in FIG. 18 is a front view showing a process of fixing the connecting member and the magnetic teeth in FIG. 15 by welding, and FIG. 19 is a plan view showing the configuration after the process in FIG. 18 is performed. In the figure, the same parts as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the first to third embodiments, the coupling and integration of the coupling member 33 and the magnetic pole teeth 31 is performed by the groove-like engaging portion 34 formed by connecting the concave portions 31a, 31d, and 31e provided in the magnetic pole teeth 31. The connection member 33 is engaged with 34d and 34e, and welding is performed at predetermined positions.

  As shown in FIG. 17, the unit magnetic pole teeth 4 in the fourth embodiment are provided with three protrusions 31f and 31g in total at the center and at both ends on the back surface of the yoke portion 31b. The central protrusion 31 f and the protrusions 31 g at both ends are formed with a distance W having the same value as the width dimension of the connecting member 33. Further, the protrusions 31g at both ends are formed so as to be located on the inner side by a half W / 2 of the width dimension of the connecting member 33 from the end face. Similarly to the third embodiment, the unit magnetic pole teeth 4 configured as described above are wound around only the two unit magnetic pole teeth 4 constituting the first magnetic pole teeth 311 and are orthogonal to the motor driving direction. Two unit magnetic pole teeth 4 are arranged in the direction, and the end surfaces of the yoke portions 31b are brought into contact with each other so that they are sequentially aligned. By this alignment, a gap formed between the protrusions 31g at both ends and the central protrusion 31f is formed as an engaging portion 34f having a width W across the plurality of magnetic pole teeth 31. Further, a gap straddling between the unit magnetic pole teeth 4 is formed between the projections 31g formed at the end portion between the rows of the unit magnetic pole teeth 4, and the width W is related to the plurality of magnetic pole teeth 31 by this gap. A joining portion 34g is formed.

  The coupling members 33 are engaged with the centers and the positions of both ends of the engaging portions 34f and 34g formed in this way, respectively, and welding is performed as shown in FIGS. 18 (A) and 18 (B). 19, the upper ends of the protrusions 31 f and 31 g and the lower side surface of the connecting member 33 are fixed. The magnetic pole teeth 31 aligned by the fixing are connected and integrated through a connecting member 33, and the armature 3 is completed.

  As described above, according to the present embodiment, the same effects as those of the third embodiment can be obtained, and the connection member 33 can be engaged with the protrusions 31f and 31g forming the engaging portions 34f and 34g. As a result, the assembly workability can be improved. Further, since both the upper and lower side surfaces of the connecting member 33 are welded, the durability against the moment applied to the welded portion is increased, and the reliability can be further improved.

  In the description of the fourth embodiment, the unit magnetic pole teeth 4 are provided with the three protrusions 34f and 34g to form the engaging portions 34f and 34g. However, the number of protrusions is not limited to this.

Embodiment 5 FIG.
FIG. 20 is a plan view showing the configuration of the armature 3 of the linear motor according to the fifth embodiment of the present invention. In the figure, the same parts as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Here, the connecting member 33 has a width W1 that is larger than the gap W between the protrusions 31f and 31g, and the recesses 7 that fit into the protrusions 31f and 31g are formed on both side surfaces.

  As described above, according to the present embodiment, the same effect as in the fourth embodiment can be obtained, and the protrusions 31f and 31g of each magnetic tooth 31 and the recess 7 of the connecting member 33 are fitted. The movement of the connecting member 33 in the longitudinal direction is restricted, the engagement of the connecting member 33 becomes more reliable, and the reliability can be further improved.

Embodiment 6 FIG.
Here, an optimum structure of the connecting member 33 is provided when the magnetic pole teeth 31 are formed by laminating electromagnetic steel plates, which are magnetic plates, in a direction perpendicular to the motor driving direction. That is, in each of the above-described embodiments, each of the connecting members 33 has a rectangular cross-sectional shape. However, in the sixth embodiment, as shown in FIG. It has a cross-sectional shape.

  In this case, the width dimension of the groove-like engagement portion 34 formed by the recess 31a provided in the yoke portion 31b of the magnetic tooth 31 is the stacking direction of the electromagnetic steel plates, and the variation in the thickness of the electromagnetic steel plates and the surroundings It can be changed by tightening of the drive coil 32 wound around. For this reason, there is a possibility that a gap is generated between the engaging portion 34 and the connecting member 33 and a stable welding effect cannot be obtained.

  Therefore, the connecting member 33 is composed of an engaging convex portion 33b that engages with the engaging portion 34 through a predetermined gap and an abutting portion 33c that abuts on the upper end surface of the engaging portion 34. To do.

  Then, as shown in FIG. 22, even if the width W3 of the engaging convex portion 33b of the connecting member 33 is set smaller than the width W2 of the engaging portion 34 and the width W2 varies slightly, W2> W3. And the gap G exists in the width direction of both. Further, the height H3 of the engaging convex portion 33b is set to be smaller than the depth H2 of the engaging portion 34 so that the gap G exists in the height direction of both.

  As a result, even if some variation occurs in the width dimension of the engaging portion 34, the lower surface of the contact portion 34c of the connecting member 33 is in close contact with the upper surface of the yoke portion 31b of the magnetic pole teeth 31, and FIG. As shown, the welding operation is stabilized by performing welding along the contact portion, and the plurality of magnetic pole teeth 31 can be reliably integrated by the connecting member 33.

  In addition, although this Embodiment 6 demonstrated the case where the connection member 33 was engaged with the engaging part 34 formed of the recessed part 31a provided in the yoke part 31b, protrusion 31f in previous Embodiment 4, The present invention can be similarly applied to the case where the connecting member 33 is engaged with the engaging portions 34f and 34g formed by the gaps between 31g, and an equivalent effect is obtained.

  Although not described in the above embodiments, by forming the connecting member 33 with a magnetic material, it is possible to increase the magnetic path and improve the performance.

  In the third, fourth, fifth, and sixth embodiments, the drive coil 32 is provided only in the first magnetic pole tooth 311. However, as in the first embodiment, the drive coils 32 are provided in all the magnetic pole teeth 31. The present invention is also applicable when 32 is provided.

  The present invention relates to a linear motor used for table feed of a general industrial machine, particularly a machine tool.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the linear motor by Embodiment 1 of this invention is shown, (A) is a top view, (B) is sectional drawing which follows II of (A). It is a front view which shows the structure of the linear motor in FIG. It is a perspective view which shows the process of arrange | positioning sequentially the magnetic pole teeth in FIG. 1, and connecting and integrating with a connection member. It is a perspective view which shows the process of adhering a connection member and magnetic pole teeth by welding. It is a front view for demonstrating in more detail the point of welding with a connection member and magnetic pole teeth. It is sectional drawing which shows the structure of the armature 3 of the other linear motor by Embodiment 1 of this invention. The structure of the linear motor in Embodiment 2 of this invention is shown, (A) is a top view, (B) is sectional drawing which follows II-II of (A). It is a perspective view which shows the armature 3 of the linear motor in FIG. (A) is sectional drawing which shows the case where a drive coil is wound around each magnetic pole tooth, (b) is the case where a drive coil is wound only around the 1st magnetic pole tooth. It is sectional drawing for demonstrating the advantage of the linear motor in Embodiment 2 of this invention. It is sectional drawing which shows the structure of the other linear motor by Embodiment 2 of this invention. It is a top view which shows the structure of the linear motor in Embodiment 3 of this invention. It is a perspective view which shows the armature of the linear motor of FIG. FIG. 13 is a perspective view showing a step of winding a drive coil around the first magnetic pole teeth of FIG. 12. It is a top view which shows the structure of the linear motor in Embodiment 4 of this invention. It is a side view which shows the structure of the linear motor in FIG. It is a front view which shows the structure of the linear motor of FIG. It is a front view which shows the process of fixing the connection member 33 and the magnetic pole tooth 31 in FIG. 15 by welding. It is a top view which shows the structure after the process in FIG. 18 was performed. It is a top view which shows the structure of the armature of the linear motor in Embodiment 5 of this invention. It is a front view which shows the structure of the linear motor in Embodiment 6 of this invention. It is a figure which shows the dimensional relationship of the connection member and engaging part in Embodiment 6 of this invention. It is a front view which shows the process of fixing the connection member and magnetic pole teeth in Embodiment 6 of this invention by welding.

Explanation of symbols

1 linear motor, 2 stator, 21 stator yoke, 22, 23 permanent magnet,
3 armatures, 31 magnetic teeth, 32 drive coils, 33 connecting members,
31b yoke part, 31c, 311c tooth part, 311 first magnetic pole teeth,
312 2nd magnetic pole teeth, 313 3rd magnetic pole teeth, 311a 1st protrusion part, 311b 1st notch part, 312a 2nd protrusion part, 312b 2nd notch part,
313a third protrusion, 313b third notch, 31a, 31d, 31e recess, 31f, 31g protrusion, 33b engagement protrusion, 33c contact portion,
34, 34d, 34e, 34f, 34g Engagement section, 4 unit magnetic teeth, 7 depressions.

Claims (13)

A stator including a stator yoke extending in the motor driving direction, and a plurality of permanent magnets arranged on the stator yoke at predetermined intervals along the motor driving direction and having different polarities, and the fixing A linear motor comprising an armature provided with a plurality of magnetic pole teeth arranged with a predetermined interval from a permanent magnet of a child and sequentially arranged along the motor driving direction, and a drive coil provided on the magnetic pole teeth Because
The magnetic teeth are located on the back side of the surface facing the stator and are in contact with the adjacent magnetic teeth, and teeth formed by projecting from the yoke to the side facing the stator. And consists of
The magnetic pole teeth include a first magnetic pole tooth and a second magnetic pole tooth disposed adjacent to the first magnetic pole tooth,
The first magnetic pole teeth have a first protrusion formed to protrude from the end face of the yoke part in the motor driving direction,
The second magnetic pole teeth have a second notch portion that is formed by cutting away from the end surface of the yoke portion in the motor driving direction and abuts on the first protrusion of the first magnetic pole tooth.
A linear motor characterized in that the plurality of magnetic teeth are connected and integrated by engaging a connecting member with an engaging portion provided on the back surface of the magnetic teeth. A stator including a stator yoke extending in the motor driving direction, and a plurality of permanent magnets arranged on the stator yoke at predetermined intervals along the motor driving direction and having different polarities, and the fixing A linear motor comprising an armature provided with a plurality of magnetic pole teeth arranged with a predetermined interval from a permanent magnet of a child and sequentially arranged along the motor driving direction, and a drive coil provided on the magnetic pole teeth Because
The magnetic teeth are located on the back side of the surface facing the stator and are in contact with the adjacent magnetic teeth, and teeth formed by projecting from the yoke to the side facing the stator. And consists of
The magnetic pole teeth include a first magnetic pole tooth and a second magnetic pole tooth disposed adjacent to the first magnetic pole tooth,
A drive coil is wound around one of the tooth portion of the first magnetic pole tooth and the tooth portion of the second magnetic pole tooth to form a main pole tooth, and the auxiliary pole is formed without winding the drive coil on the other. Configure the teeth
A linear motor characterized in that the plurality of magnetic teeth are connected and integrated by engaging a connecting member with an engaging portion provided on the back surface of the magnetic teeth. The first magnetic pole teeth have a first protrusion formed to protrude from the end face of the yoke part in the motor driving direction,
The second magnetic pole teeth have a second cutout portion that is formed by cutting out from the end surface of the yoke portion in the motor driving direction and abuts against the first protrusion of the first magnetic pole tooth. The linear motor according to claim 2, wherein The linear motor according to any one of claims 1 to 3, wherein a third magnetic pole tooth is disposed at an end portion of the magnetic pole tooth. By forming a recess on the back side of the yoke portion of each of the magnetic teeth, a groove-like engaging portion is formed by the recess extending over the plurality of yoke portions, and the engaging portion The linear motor according to any one of claims 1 to 4, wherein the plurality of magnetic pole teeth are connected and integrated by engaging a connecting member. By forming a pair of protrusions on the back side of the yoke portion of each of the magnetic teeth, an engagement portion in which a gap between the protrusions is formed across the plurality of yoke portions is provided. The linear motor according to any one of claims 1 to 4, wherein the plurality of magnetic pole teeth are connected and integrated by engaging a connecting member with the portion. The linear motor armature according to claim 6, wherein a recess that fits with each of the protrusions is formed on a side surface of the connecting member. The linear motor according to claim 1, wherein the connecting member is fixed to the engaging portion by welding. The magnetic pole teeth are formed by laminating magnetic plates in a direction orthogonal to the motor driving direction, and the connecting member is an engaging projection that engages the engaging portion with the engaging portion through a predetermined gap. The linear motor according to claim 1, further comprising a contact portion and a contact portion that contacts the upper end surface of the engagement portion. When the connecting member has a portion protruding from the inside of the engaging portion, and the height of the connecting member is H1, the depth H2 of the engaging portion is smaller than ½ of the height H1 (H2 The linear motor according to any one of claims 1 to 9, wherein <H1 / 2). 11. The linear motor according to claim 1, wherein each of the magnetic pole teeth includes a plurality of unit magnetic pole teeth arranged in a direction orthogonal to the motor driving direction. The linear motor according to claim 11, wherein the engaging portion is formed across a row of the plurality of unit magnetic pole teeth arranged, and the coupling member is engaged with the engaging portion. . The linear motor according to claim 1, wherein the connecting member is made of a magnetic material.

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