JP2007143335A - Field magneton and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lower the leaked magnetic flux from the end in the direction of the rotation axis of a field magneton. <P>SOLUTION: A magnetic pole face 112a is counterposed to an armature 2, in parallel with a rotation axis Q. The first magnet 112 is arranged in the rotational direction, around the axis of rotation Q. A magnetic pole face 122a is provided on the end side of the magnetic pole face 112a, and it is arranged to face a region surrounded by the magnetic pole face 112a and the armature 2. Since the region concerned is surrounded by the magnetic pole face of the same polarity, at a gap magnetic flux flows roughly vertically between the armature 2 and a field magneton 1, and the magnetic density improves more as compared with the case where the magnetic pole face 122a is not provided. The third section 13 functions as a back yoke which magnetically short-circuits the fellow magnetic faces 122b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor, and more particularly to a field element thereof.

  In a motor using a field element that employs a permanent magnet as a field, the axial length of the field element is set to be larger than the axial length (length along the rotation axis) of the armature core around which the armature winding is wound. Prolonging techniques have been proposed.

JP 2000-287423 A JP-A-11-332140 JP 2000-152534 A JP 2001-258189 A Gion et al., "Flux Convergence Type High Magnetic Field Permanent Magnet Magnetic Circuit", 17th "Electromagnetic Force Related Dynamics" Symposium 3PM24, June 2005

  However, a large amount of magnetic flux leaks from the end of the permanent magnet in the rotation axis direction. For example, when the armature core is formed of laminated steel plates, the magnetic resistance in the lamination direction is increased by the amount of the insulating film. The gap between the armature and the field element passes through the shortest path between the armature and the field element at and near the end of the field element that does not directly face the armature. In addition, magnetic flux that crosses diagonally is also generated. This reduces permeance.

  The present invention has been made in view of the above problems, and has an object to increase the magnetic flux generated by the permanent magnet of the field element and to reduce the leakage magnetic flux from the end of the field element in the rotation axis direction. .

  A field element according to the present invention is disposed so as to face an armature, and is capable of rotating relative to the armature in a rotation direction (R) about a rotation axis (Q) ( 1; 4; 5; 6).

  The first mode is to provide a first magnet (112, 412) that provides a first magnetic pole face (112a; 412a) disposed parallel to the rotation axis (Q) and facing the armature (2; 3). And having the same polarity as the first magnetic pole surface, and being adjacent to or spaced apart from the end side of the first magnetic pole surface in the direction parallel to the rotation axis, and surrounded by the armature and the first magnetic pole surface Second magnets (122, 123; 422, 423) that provide second magnetic pole faces (122a; 422a) facing the region to be mounted.

  A second aspect of the field element according to the present invention is the first aspect of the field element, wherein a first magnetic body (2; 3) provided on the armature (2; 3) side of the first magnetic pole surface ( 111; 411).

  A third aspect of the field element according to the present invention is the second aspect of the field element, wherein the first magnetic body (111; 411) includes the first magnetic pole surface of the first magnet. Are also provided on the opposite magnetic pole face (112b; 412b) side.

  According to a fourth aspect of the field element of the present invention, there is provided a first magnetic pole face (512a / 512b; 612a / 612b) having the same polarity and facing each other in the rotational direction (R). The magnet (512; 612) is the same polarity as the first magnetic pole surface forming the pair and is adjacent to or spaced apart from the end of the first magnetic pole surface in the direction parallel to the rotation axis. And a second magnet (522; 622) for providing a second magnetic pole surface (522a; 622a) facing a region surrounded by the first magnetic pole surface and the armature.

  A fifth aspect of the field element according to the present invention is the fourth aspect of the field element, and is provided between the pair of first magnetic pole surfaces (512a / 512b; 612a / 612b). The first magnetic body (511; 611) is further provided.

  A field element according to a sixth aspect of the present invention is any one of the fourth to fifth aspects of the field element, wherein the field element is arranged from the side opposite to the armature (2; 3). A third magnet (614) that provides a third magnetic pole surface (614a, 614b) of the same polarity as the first magnetic pole surface and the second magnetic pole surface, facing a region surrounded by the first magnetic pole surface and the second magnetic pole surface. In addition.

  A seventh aspect of the field element according to the present invention is the sixth aspect of the field element, wherein the magnetic core (4; 3) is provided on the third magnet on the side opposite to the armature (2; 3). 613).

  An eighth aspect of the field element according to the present invention is any one of the first to seventh aspects of the field element, wherein the first magnetic pole surface (112a; 412a; 512a / 512b; 612a / The length along the direction of the rotation axis (Q) of 612b) is a region (201) in which the magnetic core around which the armature winding (202a; 302a) is wound is arranged in the armature (2; 3). , 301) is equal to the length along the rotation axis direction.

  A ninth aspect of the field element according to the present invention is any one of the first to seventh aspects of the field element, wherein the second magnet (122; 422; 522; 622) has a polarity. The different second magnetic pole surfaces are ring magnets (123; 423; 522; 622) arranged along the rotation direction (R).

  A tenth aspect of a field element according to the present invention is any one of the first to third aspects of the field element, and embeds the second magnet (122; 422; 522; 622). A field element core (121; 421; 621) is further provided.

  An eleventh aspect of the field element according to the present invention is the ninth aspect of the field element, wherein the first magnet (121; 421; 521; 621) is seen from the direction of the rotation axis (Q). In the case of having a portion that protrudes beyond the second magnet (122; 422; 522; 622), the field element core is non-magnetic at least around the portion when viewed from the direction of the rotation axis (Q).

  A twelfth aspect of the field element according to the present invention is any one of the fourth to sixth aspects of the field element, wherein the field magnet core embeds the second magnet (522; 622). (621) is further provided.

  A thirteenth aspect of the field element according to the present invention is the twelfth aspect of the field element, wherein the first magnet (521; 621) is the second magnet when viewed from the direction of the rotation axis (Q). In the case of having a portion protruding beyond (522; 622), the field element core is non-magnetic at least around the portion when viewed from the direction of the rotation axis (Q).

  A fourteenth aspect of the field element according to the present invention is the seventh aspect of the field element, further comprising a field element core (621) in which the second magnet (522; 622) is embedded.

  A fifteenth aspect of the field element according to the present invention is the fourteenth aspect of the field element, wherein the second magnet (622) is the third magnetic pole surface when viewed from the direction of the rotation axis (Q). When not present on (614a, 614b), the field element core is non-magnetic at least around the position when viewed from the direction of the rotation axis (Q).

  The sixteenth aspect of the field element according to the present invention is any one of the first to fifteenth aspects of the field element, and is the second magnetic pole surface (122a; 422a; 522a; 622a). It further has the 2nd magnetic body (13; 43; 53; 63) which magnetically short-circuits the magnetic pole surface (122b; 422b; 522b; 622b) which the said 2nd magnet provides on the other side.

  A seventeenth aspect of the field element according to the present invention is the sixteenth aspect of the field element, wherein the second magnetic body (13; 43; 53; 63) in the direction of the rotation axis (Q). The end of the armature (2; 3) is farther from the first magnetic pole surface than the end of the region (202, 302) around which the armature winding (202a; 302a) is wound.

  You may comprise the motor provided with the 1st aspect thru | or the 17th aspect of the field element concerning this invention, and the said armature.

  According to the field element according to the first aspect of the present invention, the second magnetic pole surface is provided, so that the magnetic flux generated from the field element is efficiently linked to the armature. Moreover, the magnetic flux density of the magnetic flux passing through the gap between the armature and the field element is improved.

  According to the field element according to the second aspect of the present invention, the first magnetic body efficiently links the magnetic flux generated from the first magnetic pole face and the second magnetic pole face to the armature.

  According to the field element according to the third aspect of the present invention, since the first magnetic body functions as the back yoke of the first magnet, the magnetic flux generated from the first magnetic pole surface is efficiently linked to the armature. Let

  In the field element according to the fourth aspect of the present invention, since the second magnetic pole surface is provided, the magnetic flux generated from the field element is efficiently linked to the armature. Moreover, the magnetic flux density of the magnetic flux passing through the gap between the armature and the field element is improved.

  According to the field element according to the fifth aspect of the present invention, the first magnetic body efficiently links the magnetic flux generated from the first magnetic pole face and the second magnetic pole face to the armature.

  According to the field element according to the sixth aspect of the present invention, the magnetic flux linked to the armature is increased.

  According to the field element according to the seventh aspect of the present invention, the magnetic core functions as the back yoke of the third magnet.

  According to the field element according to the eighth aspect of the present invention, the second magnetic pole surface can be provided at a position facing the coil end of the armature, so that there is no significant increase in the outer shape of the field element.

  According to the field element concerning the 9th mode among this invention, formation and arrangement of a plurality of 2nd magnets are easy.

  According to the field element according to the tenth aspect, the twelfth aspect, or the fourteenth aspect of the present invention, the second magnet can be easily positioned.

  According to the field element according to the eleventh aspect or the thirteenth aspect of the present invention, between the first magnetic pole surface provided by the first magnet and another magnetic pole surface having a different polarity from the first magnetic pole surface, The magnetic flux is prevented from being short-circuited through the field element core, so that the magnetic flux generated from the first magnetic pole face is efficiently linked to the armature.

  According to the field element according to the fifteenth aspect of the present invention, the magnetic flux is prevented from being short-circuited between the third magnetic pole faces via the field element core, and thus generated from the third magnetic pole face. To efficiently link the magnetic flux to the armature.

  According to the field element of the sixteenth aspect of the present invention, since the second magnetic body functions as the back yoke of the second magnet, the magnetic flux generated from the second magnetic pole surface is efficiently linked to the armature. Let

  According to the field element according to the seventeenth aspect of the present invention, the dimension of the field element in the rotation axis direction can be made substantially the same as that of the armature.

First embodiment.
FIG. 1 is a sectional view showing the structure of a field element 1 according to a first embodiment of the present invention. In FIG. 1, the position where the armature 2 is arranged is also indicated by a broken line. The field element 1 is disposed so as to face the armature 2 and is rotatable relative to the armature 2 in the rotation direction about the rotation axis Q. FIG. 1 is a cross-sectional view at a position including the rotation axis Q.

  The field element 1 may be a stator and the armature 2 may be a rotor. However, in the following description, the field element 1 is a rotor and the armature 2 is a stator. . In the present embodiment, the field element 1 functions as a so-called outer rotor that rotates on the outer side of the armature 2 that is a stator as viewed from the rotation axis Q.

  FIG. 2 is an enlarged view partially showing the armature 2. The position where the armature 2 is arranged is divided into areas 201 and 202. In the region 201, a magnetic core around which the armature winding 202a is wound is disposed. In the region 202, an armature winding 202a is wound. In FIG. 2, a bobbin 202 b around which the armature winding 202 a is directly wound is also illustrated, and this is also disposed in the region 202.

  The field element 1 can be grasped by being divided into a first portion 11, a second portion 12, and a third portion 13. However, these boundaries do not necessarily have to be physical boundaries.

  FIG. 3 is a cross-sectional view perpendicular to the rotation axis Q, showing the configuration of the first portion 11. FIG. 1 corresponds to a cross-sectional view at a position II shown in FIG. Also in FIG. 3, the position where the armature 2 is arranged is indicated by a broken line. The rotation direction R is also indicated by an arrow. In this case, the direction of rotation does not matter, so the arrowheads are shown at both ends.

  The first portion 11 has a first magnet 112. The first magnet 112 provides magnetic pole faces 112a and 112b located on opposite sides of each other. The magnetic pole surface 112a is disposed parallel to the rotation axis Q and opposed to the armature 2. The first magnet 112 is disposed along the rotation direction R around the rotation axis Q. Normally, the magnetic pole surfaces 112a of the adjacent first magnets 112 have different polarities, but a plurality of magnetic pole surfaces 112a having the same polarity may be adjacent to each other.

  The first portion 11 further includes a first magnetic body 111. The first magnetic body 111 has a first magnet 112 embedded therein. The presence of the first magnetic body 111 facilitates the positioning of the first magnet 112 and thus the magnetic pole surface 112a. Furthermore, since the reluctance torque using the high magnetic permeability of the first magnetic body 111 can also be used in combination with the magnet torque, the efficiency that the magnetic flux contributes to the rotation is improved.

  It should be noted that magnetic pole surfaces 112a having the same polarity are close to the inner peripheral surface of the first magnetic body 111, thereby preventing magnetic flux short-circuiting with other adjacent magnetic pole surfaces 112a. it can.

  Since the 1st magnetic body 111 exists in the armature 2 side of the magnetic pole surface 112a, the magnetic flux which generate | occur | produces from the magnetic pole surface 112a is linked to the armature 2 efficiently. Further, since the first magnetic body 111 is also present on the magnetic pole surface 112b side, it functions as a back yoke of the first magnet 112 and improves the permeance coefficient, thereby improving the operating point of the first magnet 112, and thus the magnetic pole surface 112a. Are efficiently linked to the armature 2.

  FIG. 4 is a cross-sectional view perpendicular to the rotation axis Q, showing the configuration of the second portion 12. FIG. 1 corresponds to a cross-sectional view at a position II shown in FIG. Also in FIG. 4, the position where the armature 2 is arranged is indicated by a broken line. The second magnet 122 provides magnetic pole faces 122a and 122b located on opposite sides of each other.

  The magnetic pole surface 122a is disposed on the end side in the direction parallel to the rotation axis Q of the magnetic pole surface 112a having the same polarity. In FIG. 1, the magnetic pole surfaces 112a and 122a are illustrated as being adjacent to each other, but may be separated from each other. The magnetic pole surface 122 a provided on the end side of the magnetic pole surface 112 a is disposed toward a region surrounded by the magnetic pole surface 112 a and the armature 2.

  The second portion 12 further has a field element core 121. The field element core 121 has a second magnet 122 embedded therein. The presence of the field element core 121 facilitates the positioning of the second magnet 122, and hence the magnetic pole surface 122a.

  The smaller the length in the radial direction of the field element core 121 located on the armature 2 side than the second magnet 122 (that is, the distance between the second magnet 122 and the inner peripheral surface of the field element 121), the thinner the field. It is easy to ask whether the magnetic core 121 is magnetic or non-magnetic in principle. This is because magnetic saturation is likely to occur in that portion. However, when the first magnet 112 and the second magnet 122 are in a positional relationship as will be described later, it may be desirable that they are non-magnetic.

  FIG. 5 is a cross-sectional view perpendicular to the rotation axis Q, and shows how the first magnet 112 and the second magnet 122 overlap. As illustrated in FIG. 5, the second magnet 122 is at least on the armature 2 side of the first magnet 112 when viewed from the second portion 12 side along the direction parallel to the rotation axis Q from the second portion 12 side. It is desirable to exist on the magnetic pole surface 112a. This is because the magnetic flux generated from the magnetic pole surface 112a is not easily short-circuited with the magnetic pole surface 112b belonging to the same first magnet 112.

  However, when the portion where the first magnet 112 protrudes beyond the second magnet 122 as viewed from the direction of the rotation axis Q is large, or when the second magnet 122 does not exist on the magnetic pole surface 112a, the rotation axis Q It is desirable that the field element core 121 is non-magnetic at least around the portion viewed from the direction. By preventing the magnetic flux from being short-circuited via the field element core 121 between the magnetic pole surfaces 112a and 112b provided by the same first magnet 112, the magnetic flux generated from the magnetic pole surface 112a is efficiently armatured. This is to link to 2.

  FIG. 6 is a cross-sectional view perpendicular to the rotation axis Q showing the configuration of the third portion 13. FIG. 1 corresponds to a cross-sectional view at a position II shown in FIG. Also in FIG. 6, the position where the armature 2 is arranged is indicated by a broken line. The third portion 13 is composed of a second magnetic body that functions as a back yoke that magnetically short-circuits the magnetic pole surfaces 122b. By providing the second magnetic body, the permeance coefficient is improved in the same manner as the first magnetic body 111, the operating point of the second magnet 122 is improved, and the magnetic flux generated from the magnetic pole surface 122a is efficiently transferred to the armature 2. Interlink with.

  FIG. 7 is a sectional view schematically showing the magnetic flux Φ flowing in the gap between the armature 2 and the field element 1 and parallel to the rotation axis Q (not shown in FIG. 7). For simplicity, the magnetic flux Φ is illustrated only in the gap and the first magnetic body 111 on the armature 2 side.

  Since the first magnetic body 111 exists on the armature 2 side of the magnetic pole surface 112a, not only the magnetic flux generated from the magnetic pole surface 112a but also the magnetic flux generated from the magnetic pole surface 122a is efficiently linked to the armature 2. In other words, not only the magnetic pole face 112a provided in the conventional field element but also the magnetic pole face 122a is provided in the field element 1, so that the magnetic flux generated from the field element 1 is efficiently transferred to the armature 2. Interlink. In addition, the magnetic pole surface 122 a is provided on the end side of the magnetic pole surface 112 a and is disposed toward a region surrounded by the magnetic pole surface 112 a and the armature 2. Since the region is surrounded by magnetic pole faces of the same polarity, the magnetic flux Φ flows almost perpendicularly between the armature 1 and the field element 2 in the gap, and the magnetic flux density is compared with the case where the magnetic pole face 122a is not provided. Improve.

  Further, the magnetic flux that has been leaked at the end along the rotation axis Q can be reduced. In particular, as the field element becomes smaller in the direction of the rotation axis Q, the ratio of the magnetic flux leaking at the end portion tends to increase in the conventional structure. Therefore, the present invention that guides most of the magnetic flux generated from the first magnet to the armature greatly contributes to the miniaturization of the field element.

  The second portion 12 or the third portion 13 that brings about such an advantage can be provided at a position facing the coil end of the armature 2 (region 202: see FIG. 2). Therefore, there is no significant increase in the outer shape of the field element 1. This can be realized by making the length of the magnetic pole surface 112a along the direction of the rotation axis Q equal to the length of the region 201 along the direction of the rotation axis Q.

  FIG. 8 is a sectional view showing a modification of the present embodiment. The third portion 13 includes a second magnetic body 13a that functions as a back yoke and an end plate 13b. The end plate 13b may be a magnetic material or a non-magnetic material. Further, the second magnetic body 13a and the end plate 13b may be integrally formed.

  The end plate 13b is connected to a rotating shaft 9 that is disposed including the rotating shaft Q. In such a motor having an outer rotor, it is also desirable to provide an end plate 13b to support the rotating shaft 9.

  At this time, the second magnetic body 13a is provided and the end parallel to the rotation axis Q is closer to the magnetic pole surface 112a than the end of the region 202 from the viewpoint of securing insulation and reducing the generation of eddy current. It is desirable to be far away. This is because it is easy to provide the end plate 13b. This is because the dimension of the field element 1 in the direction along the rotation axis Q can be made substantially the same as that of the armature 2. This is because it is easy to provide the end plate 13b. From this viewpoint, it can be said that the present invention is suitable for a motor having an outer rotor.

  In the above description, the case where the field element 1 is provided with the second portion 12 and the third portion 13 at both ends in the rotation axis Q direction is illustrated, but may be provided only at one end side.

Second embodiment.
FIG. 9 is a sectional view showing the structure of the field element 4 according to the second embodiment of the present invention. In FIG. 9, the position where the vicinity of the inner periphery of the armature 3 is also shown by a broken line. The field element 4 is disposed so as to face the armature 3 and is rotatable relative to the armature 3 in the rotation direction about the rotation axis Q. FIG. 9 is a cross-sectional view at a position including the rotation axis Q.

  The field element 4 may be a stator and the armature 3 may be a rotor. However, in the following description, the field element 4 is a rotor and the armature 3 is a stator. . In the present embodiment, the field element 4 functions as a so-called inner rotor that rotates on the inner side of the armature 3 as a stator as viewed from the rotation axis Q.

  FIG. 10 is an enlarged view partially showing the armature 3. The position where the armature 3 is arranged is divided into regions 301 and 302. In the region 301, a magnetic core around which the armature winding 302a is wound is disposed. In the region 302, the armature winding 302a is wound. FIG. 10 also shows a bobbin 302b on which the armature winding 302a is directly wound, and this is also arranged in the region 302.

  The field element 4 can be grasped by being divided into a first portion 41, a second portion 42, and a third portion 43. However, these boundaries do not necessarily have to be physical boundaries. The first portion 41, the second portion 42, and the third portion 43 are respectively provided with cylindrical holes 410, 420, and 430 centering on the rotation axis Q. These holes communicate with each other, and together, the shaft hole 40 is formed. A rotary shaft (not shown) can be inserted into the shaft hole 40.

  FIG. 11 is a cross-sectional view showing the configuration of the first portion 41 and perpendicular to the rotation axis Q. FIG. 9 corresponds to a cross-sectional view at position IX-IX shown in FIG. In FIG. 11, the position of the inner periphery of the armature 3 is indicated by a broken line, and the rotation direction R of the field element 4 is indicated by an arrow.

  The first portion 41 has a first magnet 412. The first magnet 412 provides magnetic pole faces 412a and 412b located on opposite sides of each other. The magnetic pole surface 412a is arranged parallel to the rotation axis Q and facing the armature 3. The first magnet 412 is disposed along the rotation direction R around the rotation axis Q. Normally, the magnetic pole surfaces 412a of the adjacent first magnets 412 have different polarities, but a plurality of magnetic pole surfaces 412a having the same polarity may be adjacent to each other.

  The first portion 41 further includes a first magnetic body 411. The first magnetic body 411 has a first magnet 412 embedded therein. The presence of the first magnetic body 411 facilitates the positioning of the first magnet 412 and consequently the magnetic pole surface 412a. Furthermore, since the reluctance torque using the high magnetic permeability of the first magnetic body 411 can also be used in combination with the magnet torque, the efficiency that the magnetic flux contributes to the rotation is improved.

  In addition, when both ends of the magnetic pole surface 412a having the same polarity are close to the outer peripheral surface of the first magnetic body 411, it is possible to prevent a magnetic flux from being short-circuited with the magnetic pole surface 412a having another polarity. .

  Since the first magnetic body 411 exists on the armature 3 side of the magnetic pole surface 412a, the magnetic flux generated from the magnetic pole surface 412a is efficiently linked to the armature 3. Further, since the first magnetic body 411 is also present on the magnetic pole surface 412b side, it functions as a back yoke of the first magnet 412 and improves the permeance coefficient, thereby improving the operating point of the first magnet 412 and thus the magnetic pole surface 412a. Are efficiently linked to the armature 3.

  FIG. 12 is a cross-sectional view perpendicular to the rotation axis Q showing the configuration of the second portion 42. FIG. 9 corresponds to a cross-sectional view at position IX-IX shown in FIG. Also in FIG. 12, the position of the inner periphery of the armature 3 is indicated by a broken line. The second magnet 422 provides magnetic pole faces 422a and 422b located on opposite sides of each other.

  The magnetic pole surface 422a is disposed on the end side in the direction parallel to the rotation axis Q of the magnetic pole surface 412a having the same polarity. In FIG. 9, the magnetic pole surfaces 412a and 422a are illustrated as being adjacent to each other, but may be separated from each other. The magnetic pole surface 422 a provided on the end side of the magnetic pole surface 412 a is disposed toward a region surrounded by the magnetic pole surface 412 a and the armature 3.

  The second portion 42 further has a field element core 421. The field element core 421 has a second magnet 422 embedded therein. The presence of the field element core 421 facilitates the positioning of the second magnet 422 and consequently the magnetic pole surface 422a.

  Whether the field element core 421 is magnetic or non-magnetic is in principle unknown, but depending on the positional relationship between the first magnet 412 and the second magnet 422, similar to the first embodiment. It may be desirable to be non-magnetic.

  FIG. 13 is a cross-sectional view perpendicular to the rotation axis Q, and shows how the first magnet 412 and the second magnet 422 overlap. As illustrated in FIG. 13, when viewed along the direction parallel to the rotation axis Q, the second magnet 422 is present at least on the magnetic pole surface 412 a on the armature 3 side of the first magnet 412. desirable. This is because the magnetic flux generated from the magnetic pole surface 412a is not easily short-circuited with the magnetic pole surface 412b belonging to the same first magnet 412.

  However, when the portion where the first magnet 412 protrudes beyond the second magnet 422 is large when viewed from the rotation axis Q direction, or when the second magnet 422 does not exist on the magnetic pole surface 412a, the rotation from the rotation axis Q direction. It is desirable that the field element core 421 is non-magnetic at least at the part and around the position as seen. By preventing the magnetic flux from being short-circuited via the field element core 421 between the magnetic pole surfaces 412a and 412b provided by the same first magnet 412, the magnetic flux generated from the magnetic pole surface 412a can be efficiently armatured. This is to link to 3.

  FIG. 14 is a cross-sectional view perpendicular to the rotation axis Q showing the configuration of the third portion 43. FIG. 9 corresponds to a cross-sectional view at position IX-IX shown in FIG. Also in FIG. 14, the position of the inner periphery of the armature 3 is indicated by a broken line. The third portion 43 is composed of a second magnetic body that functions as a back yoke that magnetically short-circuits the magnetic pole surfaces 422b. By providing the second magnetic body, the permeance coefficient is improved in the same manner as the first magnetic body 111, the operating point of the permanent magnet is improved, and the magnetic flux generated from the magnetic pole surface 422a is efficiently chained to the armature 3. Let them cross.

  FIG. 15 is a sectional view schematically showing the magnetic flux Φ flowing in the gap between the armature 3 and the field element 4 and parallel to the rotation axis Q (not shown in FIG. 15). For simplicity, the magnetic flux Φ is shown only in the gap and the first magnetic body 411 on the armature 3 side.

  Similarly to the first embodiment, the first magnetic body 411 efficiently links not only the magnetic flux generated from the magnetic pole surface 412a but also the magnetic flux generated from the magnetic pole surface 422a to the armature 3. Also, by providing the magnetic pole surface 422a, the magnetic flux Φ flows almost perpendicularly between the armature 4 and the field element 3 in the gap, and the magnetic flux density is improved as compared with the case where the magnetic pole surface 422a is not provided. .

  Similar to the first embodiment, the second portion 42 or the third portion 43 that brings about such an advantage is provided at a position facing the coil end of the armature 3 (region 302: see FIG. 10). be able to. Therefore, there is no significant increase in the outer shape of the field element 4. This can be realized by making the length of the magnetic pole surface 412a along the direction of the rotation axis Q equal to the length of the region 301 along the direction of the rotation axis Q.

  In the above description, the field element 4 is exemplified by the case where the second portion 42 and the third portion 43 are provided at both ends in the direction of the rotation axis Q. However, the field element 4 may be provided only at one end side.

Third embodiment.
16 and 17 are sectional views perpendicular to the rotation axis Q, showing a field element according to a third embodiment of the present invention. Each of these has a configuration in which so-called ring magnets 123 and 423 are used as the second magnets 122 and 422 in the second portion 12 of the first embodiment and the second portion 42 of the second embodiment. ing. In the ring magnets 123 and 423, magnetic pole surfaces having different polarities are arranged along the rotation direction R.

  By adopting the ring magnets 123 and 423, it becomes easy to form and arrange the plurality of second magnets 122 and 422.

  In the case of constituting an inner rotor type motor, it is desirable to provide a field element core 421 as shown in FIG. This is because the positioning of the ring magnet 423 is facilitated and the hole 420 constituting the shaft hole is easily formed.

  Here, the case where the ring magnet 423 is provided on the outer peripheral side of the field element core 421 is illustrated, but the field element core 421 may exist further outside the ring magnet 423. For example, if the field element core 421 and the second magnetic body 43 (FIG. 9 and the like) are integrally formed, the ring magnet 423 can be embedded in these.

  However, it may be desirable that the field element core 421 includes a portion that is not a magnetic body. This is because the magnetic flux is not short-circuited between the magnetic pole faces 422a and 412b of the first magnet 412 as already described in the second embodiment.

  FIG. 18 is a cross-sectional view of the first portion 41 viewed from the second portion 42 along the rotation axis Q direction. The case where the ring magnet 423 which is a 2nd magnet does not exist on the magnetic pole surface 412a by the side of the armature 3 of the 1st magnet 412 is illustrated. Around the position, the field element core 421 is preferably non-magnetic. Since the ring magnet 423 is magnetized in the axial direction, the magnetic resistance does not differ depending on whether or not the inner side of the ring magnet 423 is a magnetic body. That is, the performance of the ring magnet 423 is not impaired when the field element core 421 is a non-magnetic material.

Fourth embodiment.
FIG. 19 is a sectional view showing the structure of a field element 5 according to the fourth embodiment of the present invention. In FIG. 19, the position where the armature 2 is disposed is also indicated by a broken line. The field element 5 is disposed so as to face the armature 2 and is rotatable relative to the armature 2 in the rotation direction about the rotation axis Q. FIG. 19 is a cross-sectional view at a position including the rotation axis Q.

  Similarly to the field elements 1 and 4, the field element 5 may be a stator or a rotor. Below, the case where the field element 5 is a rotor and functions as a so-called outer rotor will be described as an example.

  The field element 5 can be grasped by being divided into a first part 51, a second part 52, and a third part 53. However, these boundaries do not necessarily have to be physical boundaries.

  FIG. 20 is a cross-sectional view perpendicular to the rotation axis Q, showing the configuration of the first portion 11. FIG. 20 corresponds to a cross-sectional view at position XIX-XIX shown in FIG. Also in FIG. 20, the position where the armature 2 is arranged and the rotation direction R are illustrated.

  The first portion 51 has a first magnet 512. The first magnet 512 provides magnetic pole faces 512a and 512b located on opposite sides of each other. A plurality of first magnets 512 are provided, and in this embodiment, if the magnetic pole surface 512a indicates one of the N pole and the S pole, and the magnetic pole surface 512b indicates either of the other, the pair of magnetic pole surfaces 512a face each other in the rotation direction R. The same applies to the magnetic pole surface 512b. That is, the same polarity magnetic pole surfaces 512a or 512b facing each other in the rotation direction R are provided by the adjacent first magnets 512.

  The first portion 11 further includes a first magnetic body 511. The first magnetic body 511 has a first magnet 512 embedded therein. The presence of the first magnetic body 511 facilitates the positioning of the first magnet 512, and hence the magnetic pole faces 512a and 512b. The first magnetic body 511 efficiently links the magnetic flux generated from the magnetic pole faces 512a and 512b to the armature 2.

  Here, the shortest distance between the inner peripheral surface (the armature 2 side surface) of the first magnetic body 511 and the first magnet 512, or the shortest distance between the outer peripheral surface of the first magnetic body 511 and the first magnet 512, that is, The radial direction length of the thin part in the vicinity of the inner peripheral surface or the outer peripheral surface of the first magnetic body 511 is preferably small. This is to prevent the magnetic flux from being short-circuited between the magnetic pole faces 512a and 512b. Although it is desirable that the length is long from the viewpoint of obtaining the strength necessary to hold the first magnet 512, the strength is secured by employing appropriate fastening means, and thus the length is shortened. Or it can be eliminated. In this case, the leakage magnetic flux passing through the thin portion can be reduced or eliminated.

  FIG. 21 is a cross-sectional view perpendicular to the rotation axis Q, showing the configuration of the second portion 52. FIG. 21 corresponds to a cross-sectional view at position XIX-XIX shown in FIG. Also in FIG. 21, the position where the armature 2 is arranged is indicated by a broken line. The second magnet 522 provides magnetic pole faces 522a and 522b located on opposite sides of each other.

  The magnetic pole faces 522a have the same polarity as the paired magnetic pole faces 512a or 512b facing each other in the rotation direction R, and are parallel to the rotation axis Q of the magnetic pole faces 512a and 512b. It is arranged on the end side. FIG. 19 illustrates the case where the magnetic pole surface 512a or the magnetic pole surface 512b and the magnetic pole surface 522a are adjacent to each other, but may be separated from each other. The magnetic pole surface 522 a provided on the end side of the magnetic pole surface 512 a is disposed toward a region surrounded by the magnetic pole surface 512 a and the armature 2. Similarly, the magnetic pole surface 522 a provided on the end side of the magnetic pole surface 512 b is disposed toward the region surrounded by the magnetic pole surface 512 a and the armature 2.

  For example, when a ring magnet is employed as the magnet 522, a plurality of second magnets 522, 422 can be easily formed and arranged. The second portion 52 may further have a field element core. By embedding the second magnet 522 therein, the positioning of the second magnet 522, and hence the magnetic pole surface 522a, is facilitated.

  FIG. 22 is a cross-sectional view perpendicular to the rotation axis Q, showing the configuration of the third portion 53. 19 corresponds to a cross-sectional view at position XIX-XIX shown in FIG. Also in FIG. 22, the position where the armature 2 is arranged is indicated by a broken line. The third portion 53 is composed of a second magnetic body that functions as a back yoke that magnetically short-circuits the magnetic pole surfaces 522b. By providing the second magnetic body, the permeance coefficient is improved, the operating point of the second magnet 522 is improved, and the magnetic flux generated from the magnetic pole surface 522a is efficiently linked to the armature 2.

  FIG. 23 is a perspective view schematically showing the magnetic flux Φ flowing in the gap between the armature 2 and the field element 5. For simplicity, the magnetic body 511 is omitted, and only the magnetic flux Φ generated from a region surrounded by the magnetic pole surface 512b and the magnetic pole surface 522a facing each other in pairs is illustrated.

  The magnetic body 511 efficiently links not only the magnetic flux generated from the magnetic pole surfaces 512a and 512b but also the magnetic flux generated from the magnetic pole surface 522a to the armature 2. In other words, not only the magnetic pole faces 512a and 512b provided in the conventional field element but also the magnetic pole face 522a is provided in the field element 5, so that the region is surrounded by the same polarity magnetic pole face. Magnetic flux generated from the magnetic element 5 is linked to the armature 2 efficiently.

In addition, the magnetic pole surface 522 a is provided on the end side of the magnetic pole surface 512 a (or magnetic pole surface 512 b) with the same polarity, and is disposed toward the region surrounded by the magnetic pole surface 512 a (or magnetic pole surface 512 b) and the armature 2. Therefore, the magnetic flux Φ flows almost vertically between the armature 1 and the field element 5 in the gap, and the magnetic flux density is improved as compared with the case where the magnetic pole surface 522a is not provided.

  The second portion 52 or the third portion 53 that brings about such an advantage can be provided at a position facing the coil end of the armature 2 (region 202: see FIG. 2). Therefore, there is no significant increase in the outer shape of the field element 5. This can be realized by making the length of the magnetic pole surface 512a along the direction of the rotation axis Q equal to the length of the region 201 along the direction of the rotation axis Q.

  FIG. 24 is a sectional view showing a modification of the present embodiment. The third portion 53 includes a second magnetic body 53a that functions as a back yoke and an end plate 53b. The end plate 53b may be a magnetic material or a non-magnetic material. Further, the second magnetic body 53a and the end plate 53b may be integrally formed.

  The end plate 53b is connected to a rotating shaft 9 that is arranged to include the rotating shaft Q. In such a motor having an outer rotor, it is also desirable to provide an end plate 53b to support the rotating shaft 9.

  At this time, it is desirable that the second magnetic body 53 a is provided and the end parallel to the rotation axis Q is farther from the magnetic pole surface 512 a than the end of the region 202. This is because of the same reason as the end plate 13b.

  In the above description, the field element 5 is illustrated as being provided with the second portion 52 and the third portion 53 at both ends in the direction of the rotation axis Q, but may be provided only at one end side.

Fifth embodiment.
FIG. 25 is a cross-sectional view showing the structure of a field element 6 according to the fifth embodiment of the present invention. In FIG. 25, the position where the vicinity of the inner periphery of the armature 3 is arranged is also indicated by a broken line. The field element 6 is disposed so as to face the armature 2 and can be rotated relative to the armature 2 in the rotation direction about the rotation axis Q. FIG. 25 is a cross-sectional view at a position including the rotation axis Q.

  Similarly to the field elements 1, 4, and 5, the field element 6 may be a stator or a rotor. Hereinafter, the case where the field element 6 is a rotor and functions as a so-called inner rotor will be described as an example.

  FIG. 26 is a cross-sectional view perpendicular to the rotation axis Q showing the configuration of the first portion 61. FIG. 25 corresponds to a cross-sectional view at position XXV-XXV shown in FIG. Also in FIG. 26, the position of the inner periphery of the armature 3 and the rotation direction R are illustrated.

  The first portion 61 has a plurality of first magnets 612 similar to the first magnets 512 of the fourth embodiment. The first magnet 612 provides magnetic pole faces 612a and 612b, which are located on opposite sides of each other. In the present embodiment, if the magnetic pole surface 612a indicates one of the N pole and the S pole, and the magnetic pole surface 612b indicates the other, the paired magnetic pole surfaces 612a face each other in the rotational direction R. To do. The same applies to the magnetic pole surface 612b.

  The first portion 61 further includes a first magnetic body 611 similar to the first magnetic body 511 of the fourth embodiment. The first magnetic body 611 has a first magnet 612 embedded therein. Similar to the first magnetic body 511, the first magnetic body 611 facilitates the positioning of the magnetic pole faces 612a and 612b and efficiently links the magnetic flux generated from the magnetic pole faces 612a and 612b to the armature 3.

  The first portion 61 may have a field element core 613. The field element core 613 is preferably nonmagnetic in order to prevent a short circuit of magnetic flux between the magnetic pole faces 612a and 612b. The field element core 613 is preferably provided with a cylindrical hole 610 through which the rotary shaft is inserted.

  FIG. 27 is a cross-sectional view perpendicular to the rotation axis Q, showing the configuration of the second portion 62. FIG. 25 corresponds to a cross-sectional view at position XXV-XXV shown in FIG. FIG. 27 also shows the position of the inner periphery of the armature 3. The second portion 62 includes a second magnet 622 similar to the second magnet 522 of the fourth embodiment, and provides magnetic pole surfaces 622a and 622b located on opposite sides of each other.

  Similarly to the magnetic pole surface 522a, the magnetic pole surface 622a has the same polarity as the magnetic pole surface 612a or the magnetic pole surface 612b that forms a pair (that is, opposite to each other in the rotation direction R), and the rotation axis Q of these magnetic pole surfaces 612a and 612b It is arrange | positioned at the end side about a direction parallel to. FIG. 25 illustrates the case where the magnetic pole surface 612a or the magnetic pole surface 612b and the magnetic pole surface 622a are adjacent to each other, but may be separated from each other. The magnetic pole surface 622 a provided on the end side of the magnetic pole surface 612 a is disposed toward a region surrounded by the magnetic pole surface 612 a and the armature 3. Similarly, the magnetic pole surface 622a provided on the end side of the magnetic pole surface 612b is disposed toward a region surrounded by the magnetic pole surface 612a and the armature 3.

  For example, when a ring magnet is employed as the magnet 622, it is easy to form and arrange a plurality of second magnets 622, 622.

  The second portion 62 may further include a field element core 621. By embedding the second magnet 622 therein, the positioning of the second magnet 622 and thus the magnetic pole surface 622a is facilitated. Although the field element core 621 may be a magnetic body, it may be desirable that at least a part thereof is non-magnetic as will be described later.

  The field element core 621 is preferably provided with a cylindrical hole 620 for inserting the rotary shaft.

  FIG. 28 is a cross-sectional view perpendicular to the rotation axis Q, showing the configuration of the third portion 63. FIG. 25 corresponds to a cross-sectional view at a position XXV-XXV shown in FIG. Also in FIG. 28, the position where the armature 3 is arranged is indicated by a broken line. Similar to the third portion 63 of the fourth embodiment, the third portion 63 is composed of a second magnetic body that functions as a back yoke that magnetically short-circuits the magnetic pole surfaces 622b. By providing the second magnetic body, the permeance coefficient is improved, the operating point of the second magnet 622 is improved, and the magnetic flux generated from the magnetic pole surface 622a is efficiently linked to the armature 2. The third portion 63 is preferably provided with a cylindrical hole 630 for inserting the rotary shaft.

  When at least any two of the holes 610, 620, and 630 are provided and the rotation shaft is inserted through them, (when the second portion 62 or the third portion 63 is provided on both sides of the first portion 61, It is desirable that the diameters of the pair of holes 620 and the pair of holes 630 provided on both sides are substantially equal and communicate with each other. FIG. 25 illustrates a case where the shaft holes 60 are configured by the holes 610, 620, and 630.

  FIG. 29 is a perspective view schematically showing the magnetic flux Φ flowing in the gap between the armature 3 and the field element 6. For simplicity, the magnetic body 611 is omitted, and only the magnetic flux Φ generated from the region surrounded by the magnetic pole surface 612b and the magnetic pole surface 622a facing each other in pairs is illustrated. The symbols N and S between the parentheses indicate the polarities that appear on the back side of the illustrated magnetic pole surface.

  Similar to the magnetic body 511, the magnetic body 611 efficiently links not only the magnetic flux generated from the magnetic pole faces 612a and 612b but also the magnetic flux generated from the magnetic pole face 622a to the armature 2.

  Further, since the magnetic pole surface 622a is arranged in the same manner as the magnetic pole surface 522a, the magnetic flux Φ flows almost perpendicularly between the armature 3 and the field element 6 in the gap, and the magnetic flux density is not provided with the magnetic pole surface 622a. Compared with.

  The second portion 62 or the third portion 63 that brings about such an advantage can be provided at a position facing the coil end of the armature 3 (region 302: see FIG. 10). Therefore, there is no significant increase in the outer shape of the field element 6. This can be realized by making the length of the magnetic pole surface 612a along the direction of the rotation axis Q equal to the length of the region 301 along the direction of the rotation axis Q.

  FIG. 30 is a cross-sectional view illustrating a first portion 61 of a field element according to a modification of the fifth embodiment. The first portion 61 has a configuration in which a third magnet 614 is interposed between the field element core 613 and the first magnetic body 611. The third magnet 614 has magnetic pole surfaces 614a and 614b that are adjacent in the circumferential direction and have different polarities, the magnetic pole surface 614a has the same polarity as the magnetic pole surfaces 612a and 622a, and the magnetic pole surface 614b has the same magnetic pole surfaces 612b and 622b. It is the same polarity. For example, the third magnet 614 can be formed of a ring magnet magnetized in the radial direction.

  The magnetic pole surface 614a is arranged from the side opposite to the armature 3 toward the region surrounded by the magnetic pole surfaces 612a and 622a. Further, the magnetic pole surface 614b is arranged from the side opposite to the armature 3 toward the region surrounded by the magnetic pole surfaces 612b and 622b.

  In this modification, the field element core 613 located on the side opposite to the armature 3 is preferably a magnetic body so as to function as a back yoke of the magnetic pole surfaces 614a and 614b.

  FIG. 31 is a perspective view schematically showing the magnetic flux Φ flowing in the gap between the armature 3 and the field element involved in this deformation. For simplicity, the magnetic body 611 is omitted, and only the magnetic flux Φ generated from the region surrounded by the magnetic pole surface 612b and the magnetic pole surface 622a facing each other in pairs is illustrated. However, the magnetic flux generated from the magnetic pole surface 614a also contributes to increasing the magnetic flux linked to the armature.

  FIG. 30 shows an aspect in which a third magnet is provided on an inner rotor type field element. However, the third magnet is applied to the outer rotor type field element exemplified in the fourth embodiment. The armature 2 may be provided from the side opposite to the armature 2 toward the region surrounded by the magnetic pole faces 512a and 512b. Also in this case, the region is surrounded by magnetic pole faces having the same polarity.

  FIG. 32 is a cross-sectional view perpendicular to the rotation axis Q and shows how the first magnet 612 and the second magnet 622 overlap.

  As illustrated in FIG. 25, it is desirable that the second magnet 622 covers the first magnet 612 when viewed from the second portion 62 side along the direction parallel to the rotation axis Q from the second portion 62 side. This is because the magnetic flux generated from the magnetic pole surface 612a is not easily short-circuited with the magnetic pole surface 612b belonging to the same first magnet 612.

  However, as illustrated in FIG. 32, when the first magnet 612 has a portion protruding from the second magnet 622 when viewed along the direction parallel to the rotation axis Q, at least the direction seen from the rotation axis Q direction. Around the portion, the field element core 621 is preferably non-magnetic. The magnetic flux generated from the magnetic pole surfaces 612a and 612b is efficiently prevented by avoiding a short circuit of the magnetic flux via the field element core 621 between the magnetic pole surfaces 612a and 612b provided by the same first magnet 612. This is for interlinking with the armature 3.

  FIG. 33 is a cross-sectional view perpendicular to the rotation axis Q, and shows how the first magnet 612 and the third magnet 614 overlap with the second magnet 622.

  As illustrated in FIG. 31, the second magnet 622 desirably covers the third magnet 614 when viewed from the second portion 62 side along the direction parallel to the rotation axis Q from the second portion 62 side. This is because the magnetic flux is unlikely to be short-circuited between the magnetic pole surfaces 614a and 614b.

  However, as illustrated in FIG. 33, when the second magnet 622 does not exist on the magnetic pole surface 614a on the first magnet 612 side of the third magnet 614 when viewed along the direction parallel to the rotation axis Q, It is desirable that the field element core 621 is nonmagnetic at least around the position when viewed from the direction of the rotation axis Q. This is because the magnetic flux is prevented from being short-circuited via the field element core 621 between the magnetic pole faces 614a and 614b provided by the same or adjacent third magnets 614, and the increase of the magnetic flux is not impaired. .

  In the above description, the field element 6 is illustrated as being provided with the second portion 62 and the third portion 63 at both ends in the rotation axis Q direction, but may be provided only at one end side.

Various variants.
The armature windings 202a and 302a may be wound using concentrated winding, distributed winding, toroidal winding, or wave winding. When the armatures 2 and 3 are so-called claw pole types, the regions 202 and 302 (see FIGS. 2 and 10) do not substantially appear. Therefore, from the viewpoint of effective use of the coil end, it is particularly effective when used in combination with an armature other than the claw pole type.

  The length of the first portions 11, 41, 51 in the direction along the rotation axis Q may be longer than that of the regions 201, 301. For example, when the armature windings 202a and 302a are wound by distributed winding, the third portions 13, 43, and 53 do not need to approach the vicinity thereof.

  In the second portions 12, 42, 52, 62, the ring magnets are used to form the second magnets 123, 423, 522, 622 after forming the field elements 1, 4, 5, 6, respectively. There is also an advantage that it is easy compared to forming the second magnet by magnetization.

  The maximum energy product of the second magnets 122, 123, 422, 423, 522, 622 may be smaller than that of the first magnets 112, 412, 512, 612. This is because the function of the second magnet is to prevent leakage of magnetic flux generated from the first magnet, rather than increase of interlinkage magnetic flux. Therefore, a sintered neodymium magnet can be adopted as the first magnet, and a ferrite magnet can be adopted as the second magnet.

  However, in order to expect the second magnet to have a function of increasing the flux linkage, it is desirable to employ a sintered neodymium magnet. The second magnet may be molded integrally with the first magnet. In that case, it is desirable to employ a neodymium-based or samarium cobalt-based bonded magnet.

  The first magnetic bodies 111, 411, 511, and 611 can be formed by punching and laminating electromagnetic steel sheets. Alternatively, since magnetic flux flows in the direction of the rotation axis Q at these ends, it is preferable to use a dust core that can easily make the magnetic characteristics uniform in any direction. Also in other magnetic bodies, when a magnetic flux flows in the direction of the rotation axis Q (for example, the third portions 13, 43, 53, and 63), it is preferable to use a dust core.

  The third portions 13, 43, 53, and 63 can be accompanied by a function of fixing the second magnets 122, 123, 424, 423, 522, and 622. Moreover, the function of an end plate can also be accompanied.

It is sectional drawing which shows the structure of the field element concerning the 1st Embodiment of this invention. It is an enlarged view which shows an armature partially. It is sectional drawing which shows the structure of a 1st part. It is sectional drawing which shows the structure of a 2nd part. It is sectional drawing which shows the overlapping condition of a 1st magnet and a 2nd magnet. It is sectional drawing which shows the structure of a 3rd part. It is sectional drawing which shows the magnetic flux which flows into the gap between an armature and a field element. It is sectional drawing which shows the deformation | transformation of the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the field element concerning the 2nd Embodiment of this invention. It is an enlarged view which shows an armature partially. It is sectional drawing which shows the structure of a 1st part. It is sectional drawing which shows the structure of a 2nd part. It is sectional drawing which shows the overlapping condition of a 1st magnet and a 2nd magnet. It is sectional drawing which shows the structure of a 3rd part. It is sectional drawing which shows the magnetic flux which flows into the gap between an armature and a field element. It is sectional drawing which shows the structure of the field element concerning the 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the field element concerning the 3rd Embodiment of this invention. It is sectional drawing which shows the overlapping condition of a 1st magnet and a 2nd magnet. It is sectional drawing which shows the structure of the field element concerning the 4th Embodiment of this invention. It is sectional drawing which shows the structure of a 1st part. It is sectional drawing which shows the structure of a 2nd part. It is sectional drawing which shows the structure of a 3rd part. It is a perspective view which shows the magnetic flux which flows into the gap between an armature and a field element. It is sectional drawing which shows the deformation | transformation of this Embodiment. It is sectional drawing which shows the structure of the field element concerning the 5th Embodiment of this invention. It is sectional drawing which shows the structure of a 1st part. It is sectional drawing which shows the structure of a 2nd part. It is sectional drawing which shows the structure of a 3rd part. It is a perspective view which shows the magnetic flux which flows into the gap between an armature and a field element. It is sectional drawing which shows the structure of the 1st part in the deformation | transformation of the 5th Embodiment of this invention. It is a perspective view which shows the magnetic flux which flows into the gap between an armature and a field element. It is sectional drawing which shows the overlapping condition of a 1st magnet and a 2nd magnet. It is sectional drawing which shows the overlapping condition of a 1st magnet and a 3rd magnet, and a 2nd magnet.

Explanation of symbols

1, 4, 5, 6 Field element 2, 3 Armature 11, 41, 51, 61 First part 12, 42, 52, 62 Second part 13, 43, 53, 63 Third part 13a, 53a Second Magnetic body Q Rotating shaft R Rotating direction 111, 411, 511, 611 First magnetic body 112, 412, 512, 612 First magnet 112a, 112b, 122a, 122b, 422a, 412a, 412b, 422b, 512a, 512b, 522a , 522b, 612a, 612b, 622a, 622b
Magnetic pole surface 121, 421, 621 Field element core 122, 123, 422, 423, 522, 622 Second magnet 201, 202, 301, 302 region

Claims (18)

A field element (1; 4) disposed opposite to the armature (2; 3) and rotatable relative to the armature in a rotation direction (R) about the rotation axis (Q). Because
A first magnet (112, 412) providing a first magnetic pole face (112a; 412a) disposed parallel to the rotation axis (Q) and facing the armature (2; 3);
A region having the same polarity as the first magnetic pole surface and adjacent to or spaced apart from the end side of the first magnetic pole surface in a direction parallel to the rotation axis and surrounded by the armature and the first magnetic pole surface And a second magnet (122, 123; 422, 423) that provides a second pole face (122a; 422a) that faces the magnetic field. A first magnetic body (111; 411) provided on the armature (2; 3) side of the first magnetic pole surface
The field element according to claim 1, further comprising:   3. The field element according to claim 2, wherein the first magnetic body (111; 411) is also provided on the magnetic pole surface (112 b; 412 b) side of the first magnet opposite to the first magnetic pole surface. A field element (5; 6) arranged opposite to the armature (2; 3) and rotatable about the rotation axis (Q),
A first magnet (512; 612) for providing first magnetic pole faces (512a / 512b; 612a / 612b) having the same polarity and facing each other in the rotational direction (R);
The first magnetic pole surface having the same polarity as the first magnetic pole surface forming the pair, adjacent to or spaced apart from the end side of the first magnetic pole surface in the direction parallel to the rotation axis, and the first magnetic pole surface forming the pair A field element comprising a second magnet (522; 622) that provides a second magnetic pole surface (522a; 622a) facing a region surrounded by the armature.   The field element according to claim 4, further comprising a first magnetic body (511; 611) provided between the paired first magnetic pole faces (512 a / 512 b; 612 a / 612 b). A third magnetic pole having the same polarity as the first magnetic pole surface and the second magnetic pole surface, facing from the opposite side to the armature (2; 3) toward the region surrounded by the first magnetic pole surface and the second magnetic pole surface. Third magnet (614) providing surfaces (614a, 614b)
The field element according to any one of claims 4 to 5, further comprising:   The field element according to claim 6, further comprising a magnetic core (613) provided on the third magnet on a side opposite to the armature (2; 3).   The length of the first magnetic pole surface (112a; 412a; 512a / 512b; 612a / 612b) along the direction of the rotation axis (Q) is the length of the armature winding (202a; The field element according to any one of claims 1 to 7, wherein the field element (201, 301) in which the magnetic core around which the magnetic core 302a is wound is disposed is equal to the length along the rotation axis direction.   The second magnets (122; 422; 522; 622) are ring magnets (123; 423; 522; 622) in which the second magnetic pole surfaces having different polarities are arranged along the rotation direction (R). The field element according to claim 1. Field element core (121; 421) embedding said second magnet (122; 422)
The field element according to any one of claims 1 to 3, further comprising:   When the second magnet (122; 422) does not exist on the first magnetic pole surface (112a; 412) when viewed from the direction of the rotational axis (Q), at least the position when viewed from the direction of the rotational axis (Q). The field element according to claim 9, wherein the field element core is non-magnetic around. Field element core (621) for embedding the second magnet (522; 622)
The field element according to any one of claims 4 to 6, further comprising:   When the first magnet (521; 621) has a portion protruding from the second magnet (522; 622) when viewed from the direction of the rotational axis (Q), at least when viewed from the direction of the rotational axis (Q). The field element according to claim 12, wherein the field element core is non-magnetic around the portion. Field element core (621) for embedding the second magnet (522; 622)
The field element according to claim 7, further comprising:   When the second magnet (622) does not exist on the third magnetic pole surface (614a, 614b) when viewed from the direction of the rotational axis (Q), at least around the position when viewed from the direction of the rotational axis (Q). The field element according to claim 14, wherein the field element core is nonmagnetic. The second magnetic body (13; magnetically short-circuiting the magnetic pole surface (122b; 422b; 522b; 622b) provided by the second magnet on the side opposite to the second magnetic pole surface (122a; 422a; 522a; 622a). 43; 53; 63)
The field element according to any one of claims 1 to 15, further comprising: In the direction of the rotation axis (Q),
An end of the second magnetic body (13; 43; 53; 63) is an end of a region (202, 302) around which the armature winding (202a; 302a) is wound in the armature (2; 3). The field element according to claim 16, which is far from the first magnetic pole surface in comparison. A field element according to any one of claims 1 to 17,
A motor comprising the armature.

Images