JP2015171285A - Electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric machine, in which a laminate of an electromagnetic steel plate having a magnetization facilitating direction taking a direction between a magnetization direction of a main magnetic pole and a magnetization direction of a sub magnetic pole is arranged between the main magnetic pole and the sub-magnetic pole, which can suppress demagnetization of the main magnetic pole without dividing the main magnetic pole from the sub magnetic pole, can be manufactured at a lower cost and can suppress decrease in demagnetization resistance of the main magnetic pole due to decrease in permeance.SOLUTION: A main magnetic pole 21 is arranged on a first face 1 of a yoke 23 so that a magnetization direction takes alternately a direction of a yoke 23 and a direction of a gap G. Sub magnetic poles 22 are magnetized and oriented in a driving direction A and arranged on the first face of the yoke 23 so that the sub magnetic poles face each other through the main magnetic pole 21. A magnetic bundle induction part 24 is constituted by laminating electromagnetic steel plates while matching a rolling direction thereof with a laminating direction, where an angle θ between the rolling direction of the electromagnetic steel plates and the driving direction A is set to a range of 0°<θ<90°.

Description

  The present invention relates to an electric machine such as a rotary electric machine such as an electric motor or a generator or a linear motion machine such as a linear motor, and more particularly, to a field magnet having a Halbach magnet arrangement structure including a main magnetic pole and a sub magnetic pole made of permanent magnets. Concerning structure.

  A conventional permanent magnet synchronous motor has a Halbach magnet arrangement structure in which main magnetic poles and sub magnetic poles are alternately arranged on a yoke and arranged in a row, and is opposed to the field through a gap. And an armature to be arranged. The main magnetic poles are magnetized so as to be orthogonal to the arrangement direction, and are arranged so that the magnetization directions are alternately directed to the yoke side and the air gap side. The sub magnetic poles are each magnetized in the arrangement direction, and are arranged so that the magnetization directions oppose each other via the main magnetic pole.

  In the conventional field magnet configured as described above, the magnetic path of the magnetic flux generated by the secondary magnetic pole is the first magnetic field that returns from the secondary magnetic pole to the secondary magnetic pole through the primary magnetic pole on one side, the air gap, and the primary magnetic pole on the other side. And a second magnetic path returning from the auxiliary magnetic pole to the auxiliary magnetic pole through the main magnetic pole on one side, the yoke, and the main magnetic pole on the other side. The flow direction of the magnetic flux passing through the first magnetic path is the same as the magnetization direction of the main magnetic pole and does not become a demagnetizing field. On the other hand, the flow direction of the magnetic flux passing through the second magnetic path is opposite to the magnetization direction of the main magnetic pole and acts as a demagnetizing field on the main magnetic pole. For this reason, the main magnetic pole is demagnetized, the generated magnetic flux density is lowered, and the output characteristics of the motor are lowered.

  In view of such a situation, the sub magnetic pole is constituted by three permanent magnets arranged in a line in the arrangement direction, and the magnetic flux is curved from the vicinity of the main surface of the main magnetic pole on one side to the yoke side, Three permanent magnets are magnetized and oriented so as to return to the vicinity of the main surface of the main magnetic pole, and the main magnetic pole is composed of two permanent magnets divided into two in the direction orthogonal to the arrangement direction, and the permanent magnet having a large holding force A conventional permanent magnet synchronous motor has been proposed (see Patent Document 1, for example).

  In the conventional permanent magnet synchronous motor according to Patent Document 1, the sub magnetic pole is configured so that the magnetic flux is curved from the vicinity of the main surface of the main pole on one side to the yoke side and returns to the vicinity of the main surface of the other main magnetic pole. The three permanent magnets are magnetized and oriented. Therefore, the amount of magnetic flux flowing through the second magnetic path that returns from the sub-magnetic pole to the other main magnetic pole, the yoke, and the one main magnetic pole and returns to the sub-magnetic pole is reduced, and demagnetization of the main magnetic pole is suppressed. In addition, the yoke side of the main magnetic pole, which is easily demagnetized, is composed of a permanent magnet with a large holding force, so that a magnetic path from the sub magnetic pole to the sub magnetic pole returns to the sub magnetic pole through the main magnetic pole on one side, the yoke, and the main magnetic pole on the other side. The demagnetization of the main pole due to the flowing magnetic flux is alleviated.

JP 2009-106037 A

In the conventional permanent magnet synchronous motor according to Patent Document 1, the magnetization direction of the permanent magnets located at the center of the three permanent magnets constituting the sub magnetic pole is directed to the arrangement direction, but the magnetization of the permanent magnets located on both sides is directed. The direction is between the magnetization direction of the central permanent magnet and the magnetization direction of the main magnetic pole. In order to manufacture a permanent magnet magnetized in the direction between the arrangement direction and the direction orthogonal to the arrangement direction, it is necessary to cut out from a large permanent magnet, and there is a problem that the manufacturing cost increases.
In addition, a permanent magnet having a large holding force needs to use dysprosium (Dy), terbium (Tb), or the like, and there is a problem that the manufacturing cost increases.
Further, since the main magnetic pole is divided into two in the magnetization direction, there is a problem that the permeance of the main magnetic pole is lowered, the operating point of the permanent magnet is deteriorated, and the demagnetization resistance is lowered.

  The present invention has been made in order to solve the above-described problem. A laminate of electromagnetic steel sheets having an easy magnetization direction facing between the magnetization direction of the main magnetic pole and the magnetization direction of the sub magnetic pole is formed as a main magnetic pole and a sub magnetic pole. The main magnetic pole and the sub magnetic pole are not divided and the main magnetic pole is prevented from being demagnetized to reduce the manufacturing cost and the demagnetization resistance of the main magnetic pole due to the decrease in permeance. An object of the present invention is to obtain an electric machine that can suppress a decrease in the temperature.

  An electric machine according to the present invention includes an armature having a coil, a yoke arranged with the armature and a gap facing the first surface toward the armature, and driven at a constant pitch on the first surface of the yoke. A plurality of main magnetic poles arranged in a direction and held in the yoke, and a plurality of main magnetic poles arranged in the driving direction so as to be alternately arranged with the main magnetic poles arranged between the main magnetic poles. And a field of a Halbach magnet array structure having a plurality of magnetic flux guide portions arranged respectively between the main magnetic pole and the sub magnetic pole. The plurality of main magnetic poles are each composed of a permanent magnet that is magnetized and oriented in a direction orthogonal to the first surface, and the magnetizing direction is alternately directed to the yoke direction and the air gap direction. Each of the plurality of sub-magnetic poles arranged on the first surface of the yoke is made of a permanent magnet that is magnetized and oriented in the driving direction, and the first pole of the yoke is opposed to the same pole via the main magnetic pole. Each of the plurality of magnetic flux guiding portions is disposed on one surface, and is configured by laminating electromagnetic steel sheets with their rolling directions coinciding with the laminating direction, and between the rolling direction of the electromagnetic steel sheets and the driving direction. Is in a range of 0 ° <θ <90 °.

  According to the present invention, each of the plurality of magnetic flux induction portions is configured by laminating the electromagnetic steel sheets so that the rolling direction thereof coincides with the laminating direction, and the angle θ between the rolling direction of the electromagnetic steel sheets and the driving direction is The range is 0 ° <θ <90 °. Therefore, the magnetic flux generated by the sub magnetic pole is curved and flows toward the air gap, and the amount of magnetic flux flowing toward the yoke decreases. Thereby, the demagnetizing field applied to the main pole is reduced, and the demagnetization of the main pole is suppressed.

Since the magnetizing direction is between the driving direction and the magnetizing direction of the main magnetic pole, an inexpensive laminate of magnetic steel sheets is placed between the main magnetic pole and the sub magnetic pole instead of the permanent magnet with high manufacturing cost. Therefore, the manufacturing cost can be reduced.
Since demagnetization of the main magnetic pole is suppressed, it is not necessary to divide the main magnetic pole into two in the magnetization direction and to arrange an expensive permanent magnet having a high holding force on the yoke side. Therefore, the main magnetic pole can be configured at low cost.
Since it is not necessary to divide the main pole, it is possible to suppress a decrease in the demagnetization resistance of the main pole due to a decrease in permeance.

It is sectional drawing which shows the principal part of the permanent magnet synchronous linear motor which concerns on Embodiment 1 of this invention. It is a figure explaining the flow of the magnetic flux which the submagnetic pole generate | occur | produced in the field of the permanent magnet synchronous linear motor which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 2 of this invention. It is a figure explaining the flow of the magnetic flux which the submagnetic pole generate | occur | produced in the field of the permanent magnet synchronous linear motor which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 5 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 6 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 7 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 8 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 9 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 10 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 11 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 12 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 13 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 14 of this invention. It is sectional drawing which shows the principal part of the field of the permanent magnet synchronous linear motor which concerns on Embodiment 15 of this invention. It is sectional drawing which shows the principal part of the conventional permanent magnet synchronous linear motor. It is a figure explaining the flow of the magnetic flux which the main magnetic pole generate | occur | produced in the field of the conventional permanent magnet synchronous linear motor. It is a figure explaining the flow of the magnetic flux which the sub magnetic pole generate | occur | produced in the field of the conventional permanent magnet synchronous linear motor.

  Hereinafter, preferred embodiments of an electric machine according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a main part of a permanent magnet synchronous linear motor according to Embodiment 1 of the present invention, and FIG. 2 shows generation of a sub-magnetic pole in the field of the permanent magnet synchronous linear motor according to Embodiment 1 of the present invention. It is a figure explaining the flow of performed magnetic flux. 1 and 2 show a cross section orthogonal to the laminating direction of the electromagnetic steel sheets constituting the magnetic flux guiding part.

  In FIG. 1, a permanent magnet synchronous linear motor as an electric machine includes a field 20A having a Halbach magnet arrangement structure and an armature 100 arranged to face the field 20A through a gap G. Yes.

  The armature 100 includes an armature core 110 having teeth portions 111b protruding from the side surfaces of the back yoke and arranged at a constant pitch, and an armature coil 120 mounted on each of the tooth portions. Yes. The armature core 110 is configured by arranging the T-shaped split cores 111 including the back yoke portion 111a and the teeth portion 111b in a line by abutting end surfaces in the length direction of the back yoke portion 111a. The back yoke portions 111a are arranged in a line to constitute the back yoke of the armature core 110. The split iron core 111 is manufactured by stacking and integrating T-shaped core pieces formed from strips of electromagnetic steel sheets by punching or electric discharge machining. The armature iron core may be formed of a single iron core in which the tooth portions 111b protrude from the side surfaces of the back yoke and are arranged at a constant pitch.

  The field magnet 20 </ b> A includes a main magnetic pole 21, a sub magnetic pole 22, a magnetic flux guiding part 24, and a yoke 23 that holds the main magnetic pole 21, the sub magnetic pole 22, and the magnetic flux guiding part 24.

  The main magnetic pole 21 is made of a permanent magnet made in a rectangular parallelepiped and magnetized and oriented in a direction orthogonal to the driving direction A. The main magnetic poles 21 are arranged at a constant pitch in the driving direction A with the magnetizing directions B1 alternately directed to the gap G side and the yoke 23 side, and the length directions of the rectangular parallelepipeds being parallel to each other. Positioned and fixed above. Specifically, when the surface of the main magnetic pole 21 in which the arrow in the magnetization direction B1 faces is the N pole and the opposite surface is the S pole, the main magnetic pole 21 has an N pole surface on the gap G side. , S pole, N pole, S pole,... Are arranged in the driving direction A so as to be alternately arranged. The driving direction A coincides with the arrangement direction of the main magnetic pole 21 and the sub magnetic pole 22.

  The sub magnetic pole 22 is made of a permanent magnet that is manufactured in a rectangular parallelepiped and is magnetized and oriented in the driving direction A. The sub magnetic poles 22 are respectively inserted between the main poles 21 adjacent to each other with the magnetization direction B2 facing each other via the main magnetic pole 21 and a gap between the sub magnetic poles 22 and the yoke 23. Positioned and fixed above. Specifically, the sub magnetic pole 22 is disposed so that the surfaces of the same polarity face each other across the main magnetic pole 21.

  The magnetic flux guide 24 is manufactured by stacking and integrating rectangular flat plates punched from a strip of electromagnetic steel sheets so that the rolling direction coincides when viewed from the stacking direction. In FIG. 1, the magnetic flux guiding portion 24 is inserted into the gap between the main magnetic pole 21 and the sub magnetic pole 22 with the stacking direction perpendicular to the paper surface, and is positioned and fixed on the yoke 23. The magnetic flux guiding part 24 is in contact with the opposing surfaces of the main magnetic pole 21 and the sub magnetic pole 22 to suppress an increase in magnetic resistance between the main magnetic pole 21 and the sub magnetic pole 22. In the strip of the electromagnetic steel plate, the rolling direction is the easy magnetization direction C. Therefore, the rectangular flat plate is punched from the strip of the electromagnetic steel plate so that the easy magnetization direction C is between the magnetization direction B1 of the main magnetic pole 21 and the magnetization direction B2 of the sub magnetic pole 22. Specifically, when the angle of the magnetization direction B2 of the sub magnetic pole 22 with respect to the driving direction A is 0 ° and the angle of the magnetization direction B1 of the main magnetic pole 21 is 90 °, the magnetic flux guiding portion 24 with respect to the driving direction A The angle θ in the easy magnetization direction C is 0 ° <θ <90 °. As a result, the magnetic path in which the magnetic flux curves from the vicinity of the main surface (surface on the gap G side) of the main magnetic pole 21 on one side to the yoke 23 side and returns to the vicinity of the main surface of the other main magnetic pole 21 22 and a pair of magnetic flux guide portions 24 disposed on both sides of the sub magnetic pole 22.

  The yoke 23 is made into a rectangular flat plate shape using a magnetic material such as cast iron. The main magnetic pole 21, the sub magnetic pole 22, and the magnetic flux guiding part 24 are disposed on the first surface of the yoke 23.

  Next, the effect of the first embodiment will be described in comparison with the prior art.

  As shown in FIG. 18, the conventional permanent magnet synchronous motor includes a field 200 having a Halbach magnet arrangement structure, and an armature 100 arranged so as to face the field 200 through a gap G. ing. The field magnet 200 includes a main magnetic pole 201, a sub magnetic pole 202, and a yoke 203 that holds the main magnetic pole 201 and the sub magnetic pole 202. The main magnetic poles 201 are each magnetized and oriented in a direction orthogonal to the driving direction A, and are arranged at a constant pitch in the driving direction A with the magnetization direction B1 alternately directed to the gap G side and the yoke 203 side. , Disposed on the yoke 203. The sub magnetic poles 202 are respectively magnetized and oriented in the driving direction A, and are inserted between the adjacent main magnetic poles 201 so that the magnetization direction B2 is opposed to the main magnetic pole 201, and arranged on the yoke 203. It is installed.

In the field 200 configured as described above, the magnetic flux generated by the main magnetic pole 201 reaches from the main magnetic pole 201 on one side to the main magnetic pole 201 on the other side through the yoke 203 as shown by an arrow in FIG. Furthermore, it flows through a magnetic path 210 that passes through the gap G and returns to the main magnetic pole 201 on one side.
Further, the magnetic flux generated by the sub magnetic pole 202 is returned to the sub magnetic pole 202 from the sub magnetic pole 202 through the main magnetic pole 201 on one side, the air gap G and the main magnetic pole 201 on the other side, as indicated by arrows in FIG. 1 magnetic path 211a and a second magnetic path 211b that returns from the secondary magnetic pole 202 to the secondary magnetic pole 202 through the primary magnetic pole 201 on one side, the yoke 203, and the primary magnetic pole 201 on the other side.

  In the conventional permanent magnet synchronous motor, a combined magnetic flux of the magnetic flux generated by the main magnetic pole 201 flowing through the magnetic path 210 and the magnetic flux generated by the sub-magnetic pole 202 flowing through the first magnetic path 211 a is linked to the armature 100. For example, a three-phase alternating current is passed through the armature coil 120 to cause the armature 100 to generate a thrust in the driving direction A. As a result, the armature 100 moves in the driving direction A along the guide rail (not shown).

  Here, the flow direction of the magnetic flux passing through the first magnetic path 211a is the same as the magnetization direction B1 of the main magnetic pole 201 and does not become a demagnetizing field. On the other hand, the flow direction of the magnetic flux passing through the second magnetic path 211b is opposite to the magnetization direction B1 of the main magnetic pole 201, and acts as a demagnetizing field on the main magnetic pole 201. Thus, in the conventional permanent magnet synchronous motor, the amount of magnetic flux flowing through the second magnetic path 211b in the magnetic flux generated by the sub magnetic pole 202 increases. Further, a corner portion (region D3 surrounded by a broken line in FIG. 18) on the sub magnetic pole 202 side and the yoke 203 side of the main magnetic pole 201 has a magnetoresistance in the second magnetic path 211b passing through the main magnetic pole 201. Is the smallest region, the magnetic flux concentrates in the region D3. For this reason, the main magnetic pole 201 is demagnetized, the generated magnetic flux density is lowered, and the output characteristics of the motor are lowered.

  In the field 20A according to the first embodiment, the magnetic path that curves from the vicinity of the main surface of the main pole 21 on one side to the yoke 23 side and returns to the vicinity of the main surface of the other main magnetic pole 21 It is formed in a pair of magnetic flux guide portions 24 arranged on both sides of the magnetic pole 22. Therefore, most of the magnetic flux generated by the auxiliary magnetic pole 22 enters the magnetic flux guiding portion 24 on one side as indicated by an arrow 11a in FIG. Flowing into. The magnetic flux that has flown into the gap is linked to the armature 100 (not shown) and enters the other magnetic flux guiding section 24, and the magnetic flux guiding section 24 moves along the easy magnetization direction C toward the sub magnetic pole 22. After flowing, it returns to the auxiliary magnetic pole 22. As a result, the amount of magnetic flux flowing through the magnetic path 11b from the sub magnetic pole 22 through the other magnetic flux guiding portion 24, the main magnetic pole 21, the yoke 23, the one main magnetic pole 21, and the magnetic flux guiding portion 24 back to the sub magnetic pole 22 is small. Become. In this way, the amount of magnetic flux flowing through the magnetic path 11b acting as a demagnetizing field with respect to the main magnetic pole 201 is reduced, and demagnetization of the main magnetic pole 21 is suppressed. As a result, a decrease in the generated magnetic flux density of the main magnetic pole 21 due to demagnetization is suppressed, and the output characteristics of the motor are improved.

  Further, since the amount of magnetic flux flowing through the magnetic path 11b in the magnetic flux generated by the sub magnetic pole 22 decreases, the amount of magnetic flux flowing toward the gap G increases. As a result, the combined magnetic flux of the magnetic flux generated by the main magnetic pole 21 interlinked with the armature 100 and the magnetic flux generated by the sub-magnetic pole 22 is increased, and the motor characteristics can be improved.

Since the magnetic flux guiding part 24 is manufactured by laminating and integrating electromagnetic steel plates, the amount of magnetic flux flowing through the magnetic path 11b in the magnetic flux generated by the sub magnetic pole 22 is extremely small. Accordingly, since the concentration of magnetic flux in the corners (corresponding to the region D3 in FIG. 18) on the magnetic flux guiding part 24 side and the yoke 23 side of the main magnetic pole 21 is relieved, the main magnetic pole part is magnetized as in Patent Document 1. There is no need to divide into two in the direction and to dispose a permanent magnet with high holding power on the yoke side. Thus, there is no decrease in permeance of the main magnetic pole 21 resulting from dividing the main magnetic pole 21 into two permanent magnets, and a decrease in the demagnetization resistance of the main magnetic pole 21 can be suppressed. Furthermore, since it is not necessary to use a permanent magnet having a high holding force, the cost of the field 20A can be reduced.
Further, unlike Patent Document 1, it is not necessary to use a permanent magnet with a high manufacturing cost in which the magnetization direction is between the magnetization direction of the main magnetic pole and the drive direction. And since the magnetic flux induction | guidance | derivation part 24 is produced by laminating | stacking and integrating an electromagnetic steel plate, the manufacturing cost of the magnetic flux induction | guidance | derivation part 24 becomes low cost, and cost reduction of the field 20A is achieved.

  Further, since the sub magnetic pole 22 is sandwiched between a pair of magnetic flux guiding portions 24 made of an electromagnetic steel plate, the permeance of the sub magnetic pole 22 is improved as compared with the field 200 in which the sub magnetic pole 202 is sandwiched between the main magnetic poles 201. The Thereby, the magnet characteristics of the sub magnetic pole 22 are improved, and demagnetization of the sub magnetic pole 22 can be suppressed.

  Here, regardless of the directional magnetic steel sheet and the non-oriented electrical steel sheet, the easy magnetization direction C of the electrical steel sheet coincides with the rolling direction, but if the degree of coincidence between the easy magnetization direction C and the rolling direction is considered, the directivity It is desirable to use a magnetic steel sheet. Further, by appropriately adjusting the punching angle of the rectangular flat plate with respect to the rolling direction of the electromagnetic steel sheet, the magnetic flux guiding part 24 having the desired easy magnetization direction C can be easily produced.

  Furthermore, in an electromagnetic steel sheet, the angle range of 45 ° to 60 ° with respect to the rolling direction is the direction of difficulty in magnetization that hardly allows magnetic flux to pass. Therefore, it is desirable to produce the magnetic flux guiding portion 24 so that the easy magnetization direction C (rolling direction) is in an angle range of 45 ° to 30 ° with respect to the driving direction A. As a result, the amount of magnetic flux that enters the main magnetic pole 21 from the auxiliary magnetic pole 22 through the magnetic flux guide 24 and is perpendicular to the magnetization direction B1 of the main magnetic pole 21 is reduced, and demagnetization of the main magnetic pole 21 can be suppressed.

Embodiment 2. FIG.
FIG. 3 is a cross-sectional view showing the main part of the field of the permanent magnet synchronous linear motor according to Embodiment 2 of the present invention, and FIG. 4 is a sub-field in the field of the permanent magnet synchronous linear motor according to Embodiment 2 of the present invention. It is a figure explaining the flow of the magnetic flux which the magnetic pole generate | occur | produced.

In FIG. 3, the first concave portion 25 extends across the main magnetic pole 21 and the magnetic flux guiding portion 24 below the boundary line between the main magnetic pole 21 and the magnetic flux guiding portion 24 with the groove direction as the lamination direction of the electromagnetic steel plates. Further, it is formed on the upper surface (first surface) of the yoke 23.
The second embodiment is configured in the same manner as in the first embodiment except that the first recess 25 is formed in the yoke 23.

  Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.

  In the field 20B configured in this way, as shown in FIG. 4, the first recess 25 is present in the magnetic path 11b. Therefore, a magnetic gap due to the first recess 25 is formed in the magnetic path 11b, and the magnetic resistance of the magnetic path 11b increases. Thereby, the amount of magnetic flux flowing through the magnetic path 11b is reduced, and demagnetization of the main magnetic pole 21 can be suppressed. Furthermore, since the amount of magnetic flux flowing toward the gap G in the magnetic flux generated by the auxiliary magnetic pole 22 increases, the combined magnetic flux of the magnetic flux generated by the main magnetic pole 21 linked to the armature 100 and the magnetic flux generated by the auxiliary magnetic pole 22. The motor characteristics can be improved.

  In the second embodiment, the first recess 25 is a gap. However, for example, a nonmagnetic resin material may be filled in the first recess 25.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view showing the main part of the field of the permanent magnet synchronous linear motor according to Embodiment 3 of the present invention.

In FIG. 5, the magnetic flux guiding portion 24 </ b> A is a surface in which a corner between the surface in contact with the main magnetic pole 21 and the surface in contact with the yoke 23 is cut out, and the width Lb in the driving direction A of the surface in contact with the yoke 23 faces the gap G. Are formed in a pentagonal cross-sectional shape narrower than the width Lg in the driving direction A.
The third embodiment is configured in the same manner as in the first embodiment except that the magnetic flux guiding part 24A is used instead of the magnetic flux guiding part 24.

  Therefore, also in the third embodiment, the same effect as in the first embodiment can be obtained.

  In the field 20C configured as described above, as shown in FIG. 5, a cavity 26 is formed on the main magnetic pole 21 side and the yoke 23 side of the magnetic flux guiding portion 24A. Therefore, a magnetic gap due to the cavity 26 is formed in a magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke 23 side, and the magnetic resistance of the magnetic path increases. Thereby, the amount of magnetic flux flowing through the magnetic path is reduced, and demagnetization of the main magnetic pole 21 can be suppressed. Furthermore, since the amount of magnetic flux flowing toward the gap G in the magnetic flux generated by the auxiliary magnetic pole 22 increases, the combined magnetic flux of the magnetic flux generated by the main magnetic pole 21 linked to the armature 100 and the magnetic flux generated by the auxiliary magnetic pole 22. The motor characteristics can be improved.

  Since the magnetic gap due to the cavity 26 is formed at the corner of the main magnetic pole 21 on the side of the magnetic flux guide 24 and the side of the yoke 23 on the magnetic flux guide 24 side, the magnetic field passing through the region D1 surrounded by the one-dot chain line in FIG. The magnetic resistance of the road increases. Further, since the width Lb on the yoke 23 side of the magnetic flux guiding portion 24A is narrower than the width Lg on the gap G side, the region on the yoke 23 side of the magnetic flux guiding portion 24A is likely to be magnetically saturated, and the magnetic resistance is increased. As a result, the amount of magnetic flux flowing from the sub magnetic pole 22 through the magnetic flux guiding portion 24 and the main magnetic pole 21 to the yoke 23 is reduced, so that the concentration of magnetic flux in the region D1 of the main magnetic pole 21 is alleviated and demagnetization of the main magnetic pole 21 is reduced. It is suppressed.

In the third embodiment, nothing is filled in the cavity 26. For example, a nonmagnetic resin material may be filled in the cavity 26.
In the third embodiment, the magnetic flux guiding portion 24A is manufactured by cutting out the corner between the surface in contact with the main magnetic pole 21 and the surface in contact with the yoke 23. However, the width Lb is secured and the gap G side is secured. Alternatively, the magnetic flux guiding portion may be manufactured by cutting out the side of the surface of the magnetic pole 21 so as to include the side on the main magnetic pole 21 side. In this case, the magnetic flux guiding part comes into contact with the main magnetic pole 21 at the side on the main magnetic pole 21 side of the surface on the gap G side.

Embodiment 4 FIG.
6 is a cross-sectional view showing a main part of a field of a permanent magnet synchronous linear motor according to Embodiment 4 of the present invention.

In FIG. 6, the first concave portion 25 has the groove direction as the laminating direction of the electromagnetic steel plates, and straddles the main magnetic pole 21 and the cavity 26 below the boundary line between the main magnetic pole 21 and the magnetic flux guiding portion 24. It is formed on the upper surface of the yoke 23.
The fourth embodiment has the same configuration as that of the third embodiment except that the first recess 25 is formed in the yoke 23.

  Therefore, also in the fourth embodiment, the same effect as in the third embodiment can be obtained.

  In the field 20D configured in this way, as shown in FIG. 6, the first recess 25 and the cavity 26 exist in a magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke 23 side. The magnetic resistance of the magnetic path increases. Thereby, the amount of magnetic flux flowing through the magnetic path is further reduced, and demagnetization of the main magnetic pole 21 can be suppressed.

  In the fourth embodiment, the first recess 25 and the cavity 26 are not filled with anything. For example, a nonmagnetic resin material may be filled in the first recess 25 and the cavity 26.

Embodiment 5 FIG.
FIG. 7 is a cross-sectional view showing the main part of the field of the permanent magnet synchronous linear motor according to Embodiment 5 of the present invention.

In FIG. 7, the second concave portion 27 is formed on the upper surface of the yoke 23 so as to be positioned at a lower portion of a substantially central portion in the driving direction A of the sub magnetic pole 22 with the groove direction as the lamination direction of the electromagnetic steel plates.
Note that the fifth embodiment is configured in the same manner as in the second embodiment except that the second recess 27 is formed in the yoke 23.

  Therefore, also in the fifth embodiment, the same effect as in the second embodiment can be obtained.

  In the field 20E thus configured, as shown in FIG. 7, the first recess 25 and the second recess 27 are present in the magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke 23 side. Therefore, the magnetic resistance of the magnetic path further increases. Thereby, the amount of magnetic flux flowing through the magnetic path is further reduced, and demagnetization of the main magnetic pole 21 can be suppressed.

  In the fifth embodiment, nothing is filled in the first recess 25 and the second recess 27. For example, a nonmagnetic resin material is filled in the first recess 25 and the second recess 27. Also good.

Embodiment 6 FIG.
FIG. 8 is a cross-sectional view showing the main part of the field of the permanent magnet synchronous linear motor according to Embodiment 6 of the present invention.

In FIG. 8, the magnetic flux guiding portion 24 </ b> A is manufactured by cutting out a corner portion between a surface that contacts the main magnetic pole 21 and a surface that contacts the yoke 23.
The third embodiment is configured in the same manner as in the fifth embodiment except that the magnetic flux guiding part 24A is used instead of the magnetic flux guiding part 24.

  Therefore, also in the sixth embodiment, the same effect as in the fifth embodiment can be obtained.

  In the field 20F configured as described above, as shown in FIG. 8, a cavity 26 is formed on the main magnetic pole 21 side and the yoke 23 side of the magnetic flux guiding portion 24A. Therefore, in addition to the first and second recesses 25 and 27, a magnetic gap formed by the cavity 26 is formed in a magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke 23 side, so Resistance further increases. Thereby, the amount of magnetic flux flowing through the magnetic path is reduced, and demagnetization of the main magnetic pole 21 can be suppressed.

  In the sixth embodiment, the first recess 25, the cavity 26, and the second recess 27 are not filled with anything. For example, a nonmagnetic resin material is used as the first recess 25, the cavity 26, and the second recess. 27 may be filled.

Embodiment 7 FIG.
FIG. 9 is a cross-sectional view showing the main part of the field of the permanent magnet synchronous linear motor according to Embodiment 7 of the present invention.

In FIG. 9, the main magnetic pole 21 </ b> A is configured as a quadrangular prism having an isosceles trapezoidal cross section perpendicular to the length direction. The main magnetic pole 21A is disposed on the yoke 23 with one base of the isosceles trapezoidal cross section facing the gap G side. Here, if the length of one base of the isosceles trapezoidal cross section of the main magnetic pole 21A is Lmg and the length of the other base is Lmb, then Lmb> Lmg.
The magnetic flux guiding portion 24B is manufactured by securing a width Lb and notching so as to include the side on the main magnetic pole 21A side of the surface on the air gap G side. The magnetic flux guiding portions 24B are disposed on both sides of the main magnetic pole 21A so that the inclined surfaces that are notched are in contact with the inclined surfaces formed by two parallel sides of the isosceles trapezoid of the main magnetic pole 21A. Yes. Here, Lg + Lmg = Lb + Lmb.
The seventh embodiment is configured in the same manner as in the first embodiment except that the main magnetic pole 21A and the magnetic flux guiding part 24B are used instead of the main magnetic pole 21 and the magnetic flux guiding part 24.

  Therefore, also in the seventh embodiment, the same effect as in the first embodiment can be obtained.

  In the field 20G configured as described above, as shown in FIG. 9, the corners of the main magnetic pole 21A on the magnetic flux guiding portion 24B side and the yoke 23 side protrude toward the magnetic flux guiding portion 24B side. Therefore, since the magnetic flux guiding portion 24B made of an electromagnetic steel plate is present on the gap G side of the corner portion of the main magnetic pole 21A, the permeance of the region D2 of the main magnetic pole 21A surrounded by the alternate long and short dash line is improved. As a result, the operating point of the magnet is improved and demagnetization of the main magnetic pole 21A is suppressed.

  Since the width Lb on the yoke 23 side of the magnetic flux guiding portion 24B is narrower than the width Lg on the gap G side, the region on the yoke 23 side of the magnetic flux guiding portion 24B is likely to be magnetically saturated, and the magnetic resistance is increased. As a result, the amount of magnetic flux flowing from the sub magnetic pole 22 to the yoke 23 through the magnetic flux guiding portion 24B and the main magnetic pole 21A is reduced, so that the concentration of magnetic flux in the region D2 of the main magnetic pole 21A is alleviated and demagnetization of the main magnetic pole 21A is reduced. It is suppressed.

  In the seventh embodiment, the main magnetic pole 21A is configured as a quadrangular prism whose section perpendicular to the length direction is an isosceles trapezoid, but the cross-sectional shape perpendicular to the length direction of the main magnetic pole is It is not limited to a trapezoid, the length of the bottom of the gap side of the trapezoidal cross section of the main pole is shorter than the length of the bottom surface of the yoke side, and the corner part of the main pole on the magnetic flux induction part side and the yoke side protrudes to the magnetic flux induction part side, It is only necessary that the magnetic flux guiding portion made of the electromagnetic steel plate is present on the gap G side of the corner portion of the main magnetic pole.

Embodiment 8 FIG.
FIG. 10 is a cross-sectional view showing the main part of the field of the permanent magnet synchronous linear motor according to Embodiment 8 of the present invention.

In FIG. 10, the first recess 25 spans the main magnetic pole 21 </ b> A and the magnetic flux guiding portion 24 </ b> B below the boundary line between the main magnetic pole 21 </ b> A and the magnetic flux guiding portion 24 </ b> B with the groove direction as the lamination direction of the electromagnetic steel plates. Further, it is formed on the upper surface of the yoke 23.
The second embodiment is configured in the same manner as in the first embodiment except that the first recess 25 is formed in the yoke 23.

  Therefore, also in this eighth embodiment, the same effect as in the seventh embodiment can be obtained.

  In the field 20H configured in this way, as shown in FIG. 10, the first recess 25 exists in a magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke 23 side. Therefore, a magnetic gap due to the first recess 25 is formed in the magnetic path, and the magnetic resistance of the magnetic path increases. Thereby, the amount of magnetic flux flowing through the magnetic path is reduced, and demagnetization of the main magnetic pole 21A can be suppressed. Furthermore, since the amount of magnetic flux flowing toward the gap G in the magnetic flux generated by the auxiliary magnetic pole 22 increases, the combined magnetic flux of the magnetic flux generated by the main magnetic pole 21 </ b> A interlinked with the armature 100 and the magnetic flux generated by the auxiliary magnetic pole 22. The motor characteristics can be improved.

  In the eighth embodiment, the first recess 25 is a gap. However, for example, a nonmagnetic resin material may be filled in the first recess 25.

Embodiment 9 FIG.
FIG. 11 is a cross-sectional view showing the main part of the field of a permanent magnet synchronous linear motor according to Embodiment 9 of the present invention.

In FIG. 11, the second concave portion 27 is formed on the upper surface of the yoke 23 so as to be positioned at a lower portion of the substantially central portion in the driving direction A of the sub magnetic pole 22 with the groove direction as the lamination direction of the electromagnetic steel plates.
The ninth embodiment is configured in the same manner as in the eighth embodiment except that the second recess 27 is formed in the yoke 23.

  Therefore, also in the ninth embodiment, the same effect as in the eighth embodiment can be obtained.

  In the field 20I configured as described above, as shown in FIG. 11, the first recess 25 and the second recess 27 exist in the magnetic path passing through the yoke 23 (corresponding to the magnetic path 11b in FIG. 4). Therefore, the magnetic resistance of the magnetic path further increases. Thereby, the amount of magnetic flux flowing through the magnetic path is further reduced, and demagnetization of the main magnetic pole 21A can be suppressed.

  In the ninth embodiment, nothing is filled in the first recess 25 and the second recess 27. For example, a nonmagnetic resin material is filled in the first recess 25 and the second recess 27. Also good.

Embodiment 10 FIG.
FIG. 12 is a cross-sectional view showing the main part of the field of the permanent magnet synchronous linear motor according to Embodiment 10 of the present invention.

  In FIG. 12, the split core 30 is integrally formed in a T shape including a yoke portion 30 a and a magnetic flux guide portion 30 b, and a T-shaped core piece punched out from a strip of electromagnetic steel sheets is laminated and integrated. Produced. The split cores 30 are arranged in a row in the driving direction A with the end faces in the length direction of the yoke portion 30a butting each other. And the yoke part 30a continues in the drive direction to constitute the yoke 23 in the first embodiment. The main magnetic pole 21 and the sub magnetic pole 22 are alternately inserted and held in the driving direction A between the magnetic flux guiding portions 30b of the split core 30 where the end faces of the yoke portion 30a are abutted.

When the angle of the magnetization direction B2 of the sub magnetic pole 22 with respect to the driving direction A is 0 ° and the angle of the magnetization direction B1 of the main magnetic pole 21 is 90 °, the magnetization direction C of the magnetic flux guiding portion 30b with respect to the driving direction A The angle θ is 0 ° <θ <90 °. Thereby, the magnetic path in which the magnetic flux curves from the vicinity of the main surface of the main magnetic pole 21 on one side (surface on the gap G side) to the yoke portion 30a side and returns to the vicinity of the main surface of the other main magnetic pole 21 It is formed on the magnetic pole 22 and a pair of magnetic flux guiding portions 30b disposed on both sides of the sub magnetic pole 22.
Other configurations in the tenth embodiment are the same as those in the first embodiment.

  Therefore, also in the tenth embodiment, the same effect as in the first embodiment can be obtained.

In the field 20J configured as described above, the yoke portion 30a and the magnetic flux guiding portion 30b are made of only an electromagnetic steel plate, and therefore the yoke 23 and the magnetic flux guiding portion 24 are made of different materials. Compared to 20I, the number of structural members is reduced, and the manufacturing cost can be reduced.
Further, since the yoke portion 30a is made of an electromagnetic steel plate having higher magnetic saturation characteristics than the yoke 23 made of cast iron or the like, the permeance of the main magnetic pole 21 and the sub magnetic pole 22 due to the saturation of the yoke portion 30a. Is suppressed, and demagnetization of the main magnetic pole 21 and the sub magnetic pole 22 is suppressed.

Embodiment 11 FIG.
13 is a cross-sectional view showing a main part of a field of a permanent magnet synchronous linear motor according to Embodiment 11 of the present invention.

In FIG. 13, the first concave portion 31 spans the main magnetic pole 21 and the magnetic flux guiding portion 30 b below the boundary line between the main magnetic pole 21 and the magnetic flux guiding portion 30 b with the groove direction as the lamination direction of the electromagnetic steel plates. Further, it is formed on the yoke 23.
Note that the eleventh embodiment is configured in the same manner as in the tenth embodiment except that the first recess 31 is formed in the yoke portion 30a.

  Therefore, also in this eleventh embodiment, the same effect as in the tenth embodiment can be obtained.

  In the field 20K configured as described above, the first recess 31 is present in a magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke portion 30a side. Therefore, a magnetic gap due to the first recess 31 is formed in the magnetic path, and the magnetic resistance of the magnetic path increases. Thereby, the amount of magnetic flux flowing through the magnetic path is reduced, and demagnetization of the main magnetic pole 21 can be suppressed. Further, since the amount of magnetic flux flowing toward the gap G in the magnetic flux generated by the auxiliary magnetic pole 22 increases, the combined magnetic flux of the magnetic flux generated by the main magnetic pole 21 linked to the armature and the magnetic flux generated by the auxiliary magnetic pole 22 is increased. The motor characteristics can be improved.

  In the eleventh embodiment, the first recess 31 is a gap. However, for example, a nonmagnetic resin material may be filled in the first recess 31.

Embodiment 12 FIG.
FIG. 14 is a cross-sectional view showing the main part of the field of a permanent magnet synchronous linear motor according to Embodiment 12 of the present invention.

In FIG. 14, the second recess 32 is formed in the yoke portion 30 a so that the groove direction is the lamination direction of the electromagnetic steel plates and is positioned at a lower portion of a substantially central portion in the driving direction A of the sub magnetic pole 22.
Note that the twelfth embodiment is configured in the same manner as the eleventh embodiment except that the second recess 32 is formed in the yoke portion 30a.

  Therefore, also in the twelfth embodiment, the same effect as in the eleventh embodiment can be obtained.

  In the field 20L configured as described above, the first concave portion 31 and the second concave portion 32 exist in the magnetic path passing through the yoke portion 30a side (corresponding to the magnetic path 11b in FIG. 4). Resistance further increases. Thereby, the amount of magnetic flux flowing through the magnetic path is further reduced, and demagnetization of the main magnetic pole 21 can be suppressed.

  In the twelfth embodiment, nothing is filled in the first recess 31 and the second recess 32. For example, a nonmagnetic resin material is filled in the first recess 31 and the second recess 32. Also good.

Embodiment 13 FIG.
FIG. 15 is a cross sectional view showing a main portion of a field of a permanent magnet synchronous linear motor according to Embodiment 13 of the present invention.

In FIG. 15, main magnetic poles 21 </ b> A and sub magnetic poles 22 are alternately arranged in the driving direction A.
The split core 30A is formed in a T shape in which the magnetic flux guiding portion 30c protrudes from the inner peripheral surface of the yoke portion 30a. The magnetic flux guiding portion 30c is formed on a plane formed by an inclined surface that is in contact with an inclined surface constituted by non-parallel sides of the isosceles trapezoidal cross section of the main magnetic pole 21A, and a side formed on the main magnetic pole 21A side of the rectangular cross section of the sub magnetic pole 22 A vertical surface that is perpendicular to the inner peripheral surface of the yoke portion 30a.
Note that the thirteenth embodiment is configured in the same manner as in the tenth embodiment except that the main magnetic pole 21A and the split core 30A are used instead of the main magnetic pole 21 and the split core 30.

  Therefore, also in the thirteenth embodiment, the same effect as in the tenth embodiment can be obtained.

  In the field 20M configured as described above, the corner of the main magnetic pole 21A on the side of the magnetic flux guide 30c and on the side of the yoke 30a protrudes toward the magnetic flux guide 30c. Therefore, since the magnetic flux guiding portion 30c made of an electromagnetic steel sheet is present on the gap G side of the corner portion of the main magnetic pole 21A, the permeance of the corner portion of the main magnetic pole 21A is improved. As a result, the operating point of the magnet is improved and demagnetization of the main magnetic pole 21A is suppressed.

  Since the width on the yoke 23 side of the magnetic flux guiding portion 30c is narrower than the width on the gap G side, the region on the yoke 30a side of the magnetic flux guiding portion 30c is likely to be magnetically saturated, and the magnetic resistance is increased. As a result, the amount of magnetic flux flowing from the sub magnetic pole 22 through the magnetic flux guiding portion 30c and the main magnetic pole 21A to the yoke portion 30a is reduced, so that the concentration of magnetic flux at the corner of the main magnetic pole 21A is alleviated and the main magnetic pole 21A is reduced. Magnetism is suppressed.

  In the thirteenth embodiment, the main magnetic pole 21A is used, but the main magnetic pole 21 may be used. In this case, since the cavity is formed between the main magnetic pole 21 and the magnetic flux guiding portion 30c so as to face the yoke portion 30a, the magnetic resistance of the magnetic path of the magnetic flux flowing toward the yoke portion 30a is increased, and the main magnetic pole 21 is increased. Can be suppressed.

Embodiment 14 FIG.
FIG. 16 is a cross sectional view showing a main portion of a field of a permanent magnet synchronous linear motor according to Embodiment 14 of the present invention.

In FIG. 16, the first concave portion 31 spans the main magnetic pole 21 </ b> A and the magnetic flux guiding portion 30 c below the boundary line between the main magnetic pole 21 </ b> A and the magnetic flux guiding portion 30 c with the groove direction as the lamination direction of the electromagnetic steel plates. Further, it is formed in the yoke portion 30a.
In the fourteenth embodiment, the configuration is the same as in the thirteenth embodiment except that the first recess 31 is formed in the yoke portion 30a.

  Therefore, also in the fourteenth embodiment, the same effect as in the thirteenth embodiment can be obtained.

  In the field 20N configured as described above, the first recess 31 is present in a magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke portion 30a side. Therefore, a magnetic gap due to the first recess 31 is formed in the magnetic path, and the magnetic resistance of the magnetic path increases. Thereby, the amount of magnetic flux flowing through the magnetic path is reduced, and demagnetization of the main magnetic pole 21A can be suppressed. Further, since the amount of magnetic flux flowing toward the gap G in the magnetic flux generated by the auxiliary magnetic pole 22 increases, the combined magnetic flux of the magnetic flux generated by the main magnetic pole 21A interlinked with the armature and the magnetic flux generated by the auxiliary magnetic pole 22 is increased. The motor characteristics can be improved.

  In the fourteenth embodiment, the first recess 31 is a gap. However, for example, a nonmagnetic resin material may be filled in the first recess 21.

Embodiment 15 FIG.
FIG. 17 is a cross-sectional view showing the main parts of the field of the permanent magnet synchronous linear motor according to Embodiment 15 of the present invention.

In FIG. 17, the second concave portion 32 is formed in the yoke portion 30 a so that the groove direction is the lamination direction of the electromagnetic steel plates and is positioned at a lower portion of a substantially central portion in the driving direction A of the sub magnetic pole 22.
The fifteenth embodiment is configured in the same manner as the thirteenth embodiment except that the second recess 32 is formed in the yoke portion 30a.

  Therefore, in the fifteenth embodiment, the same effect as in the thirteenth embodiment can be obtained.

  In the field 20O configured as described above, the first recess 31 and the second recess 32 exist in a magnetic path (corresponding to the magnetic path 11b in FIG. 4) passing through the yoke portion 30a side. Resistance further increases. Thereby, the amount of magnetic flux flowing through the magnetic path is further reduced, and demagnetization of the main magnetic pole 21A can be suppressed.

  In the fifteenth embodiment, nothing is filled in the first recess 31 and the second recess 32. For example, a nonmagnetic resin material is filled in the first recess 31 and the second recess 32. Also good.

In each of the above embodiments, the armature constituting the permanent magnet synchronous linear motor includes the armature core and the armature coil. However, the armature may be a coreless armature in which the armature core is omitted.
In the above embodiment, the permanent magnet synchronous linear motor is configured to energize the armature coil and move the armature in the driving direction. However, the permanent magnet synchronous linear motor energizes the armature coil. Thus, the field may be configured to move in the driving direction.

  Moreover, although each said embodiment demonstrated the permanent-magnet synchronous linear motor, even if it applies this invention to rotary electric machines, such as a generator and an electric motor, there exists the same effect. In this case, a Halbach magnet arrangement structure including a main magnetic pole, a sub magnetic pole, and a magnetic flux guiding portion may be configured on the outer peripheral surface of the rotor core of the rotating electrical machine.

  20A, 20B, 20C, 20D, 20E, 20F, 20G, 20H, 20I, 20J, 20K, 20L, 20M, 20N, 20O Field, 21, 21A Main pole, 22 Sub pole, 23 Yoke, 24, 24A, 24B Magnetic flux induction part, 25, 31 First concave part, 26 Cavity, 27, 32 Second concave part, 30, 30A Split core, 30a Yoke part, 30b, 20c Magnetic flux induction part, 100 Armature, 120 Armature coil, A Drive direction , B1, B2 magnetization direction, C easy magnetization direction, G gap.

Claims (6)

An armature having a coil;
A yoke arranged with the armature and the gap facing the armature through the first surface, and a plurality of main elements arranged on the first surface of the yoke at a constant pitch in the driving direction and held by the yoke A plurality of sub-magnetic poles arranged in the driving direction so as to be alternately arranged with the main magnetic poles and arranged between the main magnetic poles and the main magnetic poles, and held between the yokes, and between the main magnetic poles and the sub-magnetic poles A field of a Halbach magnet array structure having a plurality of magnetic flux induction portions arranged in each of
The plurality of main magnetic poles are each composed of a permanent magnet that is magnetized and oriented in a direction orthogonal to the first surface, and the magnetizing direction is alternately directed to the yoke direction and the air gap direction. Disposed on the first surface of the yoke;
Each of the plurality of sub magnetic poles is made of a permanent magnet that is magnetized and oriented in the driving direction, and is disposed on the first surface of the yoke so that the same poles face each other via the main magnetic pole,
Each of the plurality of magnetic flux induction portions is configured by laminating electromagnetic steel sheets with their rolling directions coinciding with the laminating direction, and an angle θ between the rolling direction of the electromagnetic steel sheets and the driving direction is 0 ° < An electrical machine having a range of θ <90 °.   A first recess is formed in the first surface of the yoke so as to straddle the main magnetic pole and the magnetic flux guiding portion at a lower portion of the boundary between the main magnetic pole and the magnetic flux guiding portion. The electric machine according to claim 1.   The width in the driving direction of the surface on the yoke side of the magnetic flux guiding portion is configured to be narrower than the width in the driving direction on the surface on the air gap side of the magnetic flux guiding portion, and a cavity is formed between the main magnetic pole and the magnetic flux guiding portion. The electric machine according to claim 1, wherein the electric machine is formed so as to face the yoke therebetween.   The second concave portion is formed in the first surface of the yoke so as to face the sub magnetic pole at a lower portion of the central portion in the driving direction of the sub magnetic pole. 4. The electric machine according to any one of 3 above.   The width in the driving direction of the surface on the first surface side of the main magnetic pole is configured to be wider than the width in the driving direction on the surface on the air gap side of the first magnetic pole. The electric machine of any one of Claim 2 and Claim 4. The yoke is configured by abutting end portions in the length direction of the yoke portions at a central position in the driving direction of the main magnetic pole and the sub magnetic pole, and arranging the plurality of yoke portions in the driving direction.
The magnetic flux induction part and the yoke part are produced by laminating the electromagnetic steel plates, and the magnetic flux induction part is integrally formed in a T shape protruding from the central part in the length direction of the yoke part. The electric machine according to any one of claims 1 to 5, characterized in that:

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