Electric Motor

Abstract

The motor (101) comprises a movable part (30A) and a fixed part (20), wherein the movable part (30A) comprises a pair of wound main teeth (11, 12) arranged at adjacent positions in the X-axis direction, namely, a main tooth pair (1), wherein the main tooth (11) comprises a tooth (112) connected to a core seat and a front end core (113) located at a position opposite to the fixed part (30A) and connected to the front end of the tooth (112), and the main tooth (12) comprises a tooth (112) connected to the core seat. The electrical angle between the tooth (122) and a front end core (123) located opposite to the fixing member (30A) and connected to the front end of the tooth (122), the center position of the surface of the tooth (112) connected to the core seat in the X-axis direction and the center position of the surface of the tooth (122) connected to the core seat in the X-axis direction is greater than the electrical angle between the center position of the front end core (113) in the X-axis direction and the center position of the front end core (123) in the X-axis direction.

Description

Technical Field

[0001] The present invention relates to a motor using permanent magnets. Background Art

[0002] The movable part of the motor has a pair of main teeth which protrude perpendicularly to the traveling direction of the movable core and are wound with wires. In the movable part, the pair of main teeth and auxiliary teeth which are not wound with wires are alternately arranged.

[0003] For example, in order to improve efficiency, the motor described in Patent Document 1 has a permanent magnet pole number P of P=14n (n is a natural number), and a pair of winding teeth protruding in the radial direction of the stator, i.e., a main tooth pair, is 6n. The 6n main tooth pairs are arranged at an equal interval of 60° / n in the circumferential direction, and the winding tooth pairs are arranged with their circumferential center positions offset by 360° / P in the circumferential direction. In addition, corresponding coils of the same phase are wound around the two winding teeth of the main tooth pair, and auxiliary teeth are provided between adjacent tooth pairs.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2009-171748 Summary of the invention

[0005] However, in the technology of the above-mentioned Patent Document 1, the area between the main teeth and the auxiliary teeth determined by the spacing between the circumferential center positions of the main teeth and the auxiliary teeth is larger than the area between the main teeth determined by the spacing between the circumferential center positions of the main teeth pair. Therefore, the technology of the above-mentioned Patent Document 1 has the problem that the ratio of the winding area to the area where the winding teeth are arranged, that is, the winding occupancy rate is low.

[0006] The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to obtain a motor having an improved winding duty ratio.

[0007] In order to solve the above-mentioned problems and achieve the purpose, the motor of the present invention has a movable part and a fixed part, and the movable part has a pair of a first main tooth and a second main tooth arranged at adjacent positions in the first direction, that is, a main tooth pair and an auxiliary tooth between the main tooth pair and the main tooth pair that is not wound. The first main tooth has a first tooth connected to the core seat and a first front end core located at a position opposite to the fixed part and connected to the front end of the first tooth. The second main tooth has a second tooth connected to the core seat and a second front end core located at a position opposite to the fixed part and connected to the front end of the second tooth. The auxiliary teeth are extended in a direction parallel to the extending direction of the main tooth pair, and the center position of the first direction of the surface of the first tooth connected to the core seat is the same as the center position of the first direction of the surface of the first tooth connected to the first front end core. The center position of the first direction of the surface of the second tooth connected to the core seat is the same as the center position of the first direction of the surface of the second tooth connected to the second front end core. The electrical angle between the center position of the surface of the first tooth in contact with the core seat in the first direction and the center position of the surface of the second tooth in contact with the core seat in the first direction is greater than the electrical angle between the center position of the first front end core in the first direction and the center position of the second front end core in the first direction.

[0008] Effects of the Invention

[0009] The electric motor according to the present invention has an effect of being able to improve the winding duty ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view showing the structure of the electric motor according to the first embodiment.

[0011] Figure 2 is a cross-sectional view showing the structure of the electric motor according to the first embodiment

[0012] Figure 3 is a cross-sectional view showing the structure of a motor of a comparative example

[0013] Figure 4 is a cross-sectional view showing the structure of the electric motor according to the second embodiment DETAILED DESCRIPTION

[0014] Hereinafter, a motor according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0015] Implementation method 1.

[0016] Figure 1101 is a perspective view showing the structure of the motor involved in Embodiment 1. In the following description, the horizontal plane is set as the XY plane, the Z-axis direction is set as a direction parallel to the vertical direction, and the case where the movable member 30A moves in the X-axis direction is described. In the following, the positive direction of the Z-axis is sometimes referred to as the upper direction of the motor 101, and the negative direction of the Z-axis is sometimes referred to as the lower direction of the motor 101.

[0017] The motor 101 is arranged on a stand 303 provided in an industrial machine or the like. The motor 101 includes a fixed part 20 extending in the X-axis direction, a movable part 30A moving in the X-axis direction on the fixed part 20, and a workbench 302. In the first embodiment, the motor 101 is a linear motor. The X-axis direction, which is the moving direction of the movable part 30A, is the first direction. In addition, the motor 101 of the present invention can also be applied to a rotating machine. In this case, the first direction becomes the circumferential direction of the rotating machine.

[0018] A table 302 is arranged on the movable member 30A, and a workpiece 301 and the like are placed on the upper surface of the table 302. When the motor 101 is operated, the movable member 30A moves in the X-axis direction. As a result, the table 302 fixed to the movable member 30A moves in the X-axis direction, and the workpiece 301 moves in the X-axis direction.

[0019] Figure 2 2 is a cross-sectional view showing the structure of the electric motor according to Embodiment 1. Figure 2 In the figure, it is shown that Figure 1 The motor 101 shown is a cross-sectional structure of a portion of the motor 101 when the motor 101 is cut along a plane parallel to the XZ plane. Figure 2 In the embodiment, the axes of the coils 151 and 152 of the motor 101 are Figure 2 The XZ plane extends along the Z axis.

[0020] The movable member 30A has a plurality of main tooth pairs 1 and the same number of auxiliary teeth 2 as the main tooth pairs 1. One set of main tooth pairs 1 is composed of the first main tooth, i.e., the main tooth 11, and the second main tooth, i.e., the main tooth 12. In the movable member 30A, the main tooth pairs 1 and the auxiliary teeth 2 are arranged alternately. In the movable member 30A, two main teeth 11 and 12 are arranged consecutively at intervals of 180 degrees in electrical angle in the traveling direction.

[0021] The main tooth 11 has a core seat 111, a tooth 112 and a front end core 113. A coil 151 is wound around the tooth 112. In the main tooth 11, the tooth 112 extends in a convex shape toward the lower side (negative direction of the Z axis) of the core seat 111, that is, the side of the fixed part 20. As described above, the tooth 112 extends in a direction perpendicular to the direction of travel of the movable part 30A. In addition, at the front end portion of the lower side of the tooth 112, a front end core 113 is arranged at a position opposite to the fixed part 20. In the main tooth 11, the thickness (width) of the tooth 112 in the X-axis direction is thinner than the thickness of the core seat 111 in the X-axis direction. In addition, the center position of the front end core 113 in the X-axis direction is the same as the center position of the core seat 111 in the X-axis direction.

[0022] The main tooth 12 has a core seat 121, a tooth 122 and a front end core 123. A coil 152 is wound around the tooth 122. In the main tooth 12, the tooth 122 extends in a convex shape toward the lower side of the core seat 121, that is, the side of the fixed part 20. As described above, the tooth 122 extends in a direction perpendicular to the moving direction of the movable part 30A. In addition, at the front end portion of the lower side of the tooth 122, a front end core 123 is arranged at a position opposite to the fixed part 20. In the main tooth 12, the thickness of the tooth 122 in the X-axis direction is thinner than the thickness of the core seat 121 in the X-axis direction. In addition, the center position of the front end core 123 in the X-axis direction is the same as the center position of the core seat 121 in the X-axis direction.

[0023] The auxiliary tooth 2 has a core seat 21, a tooth 22 and a front end core 23. There is no coil wound on the tooth 22. In the auxiliary tooth 2, the tooth 22 extends in a convex shape toward the lower side of the core seat 21, that is, the side of the fixed member 20. As described above, the tooth 22 extends in a direction perpendicular to the moving direction of the movable member 30A. In addition, at the front end portion of the lower side of the tooth 22, the front end core 23 is arranged at a position opposite to the fixed member 20. In the auxiliary tooth 2, the thickness of the tooth 22 in the X-axis direction is thinner than the thickness of the core seat 21 in the X-axis direction.

[0024] In the motor 101, the tooth 112 is the first tooth, the tooth 122 is the second tooth, and the tooth 22 is the third tooth. In addition, the front end core 113 is the first front end core, and the front end core 123 is the second front end core.

[0025] In the movable part 30A, the core bases 21, 111, 121 are all connected and constituted by a single plate. The main tooth pair 1 includes the main tooth pair 1 of the U phase, the main tooth pair 1 of the V phase, and the main tooth pair 1 of the W phase. In the movable part 30A, the main tooth pair 1 of the U phase, the auxiliary teeth 2, the main tooth pair 1 of the V phase, the auxiliary teeth 2, the main tooth pair 1 of the W phase, and the auxiliary teeth 2 are arranged in this order along the X-axis direction.

[0026] With this arrangement, the coils 151 and 152 of the U-phase, V-phase, and W-phase are opposite to each other in the X-axis direction. Specifically, the coil 151 arranged on the main tooth 11 of the U-phase is opposite to the coil 152 arranged on the main tooth 12 of the U-phase, and the coil 152 arranged on the main tooth 12 of the U-phase is opposite to the coil 151 arranged on the main tooth 11 of the V-phase via the auxiliary tooth 2.

[0027] The coil 151 arranged on the V-phase main tooth 11 faces the coil 152 arranged on the V-phase main tooth 12 , and the coil 152 arranged on the V-phase main tooth 12 faces the coil 151 arranged on the W-phase main tooth 11 via the auxiliary tooth 2 .

[0028] The coil 151 arranged on the W-phase main tooth 11 faces the coil 152 arranged on the W-phase main tooth 12 , and the coil 152 arranged on the W-phase main tooth 12 faces the coil 151 arranged on the U-phase main tooth 11 via the auxiliary tooth 2 .

[0029] The stator 20 has a plurality of S-pole permanent magnets 36 and N-pole permanent magnets 37 alternately. In the stator 20, the S-pole permanent magnets 36 and N-pole permanent magnets 37 are alternately arranged at a specific interval, i.e., a first interval. In the motor 101, a second interval between the center position of the front end core 113 in the X-axis direction and the center position of the front end core 123 in the X-axis direction is equal to the first interval between the permanent magnets 36 and 37. In addition, when the motor 101 is a linear motor, the total number of the permanent magnets 36 and 37 is an odd number, and when the motor 101 is a rotary motor, the number of the permanent magnets 36 and 37 is an even number.

[0030] The stator 20 is arranged at a position opposite to the movable part 30A in the Z-axis direction. Specifically, the movable part 30A is arranged on the upper side of the stator 20 in such a manner that the upper surface of the permanent magnet 36 of the S pole or the upper surface of the permanent magnet 37 of the N pole is opposite to the bottom surface of the front end core 23, 113, 123 or the bottom surface of the coil 151, 152.

[0031] In the main tooth pair 1, with the boundary surface L0 between the core seat 111 and the core seat 121 as a reference, the teeth 112 and 122 are formed in such a manner that the tooth 112 is away from the boundary surface L0 and the tooth 122 is away from the boundary surface L0. The boundary surface L0 is a surface parallel to the YZ plane. As a result, the center position of the core seat 111, that is, the core seat center position a, and the center position of the tooth 112, that is, the tooth center position b, are offset. In addition, in the first embodiment, the structure of the motor 101 is described using the boundary surface L0, but in fact, the core seats 21, 111, and 121 are all connected, so the boundary surface L0 does not actually exist. The distance between the boundary surface L0 in the main tooth 11 and the tooth center position b is longer than the distance between the boundary surface L0 in the main tooth 11 and the core seat center position a. The core seat center position a and the tooth center position b are both located in the X-axis direction. Hereinafter, the distance between the core seat center position a and the tooth center position b in the X-axis direction is referred to as the position offset S.

[0032] Similarly, the center position a of the core holder 121 is offset from the center position b of the tooth 122. The distance between the boundary surface L0 in the main tooth 12 and the center position b of the tooth 122 is longer than the distance between the boundary surface L0 in the main tooth 12 and the center position a of the core holder 121.

[0033] Through this structure, in the movable part 30A, the electrical angle between the center position of the surface of the tooth 112 in contact with the core seat 111 in the X-axis direction and the center position of the surface of the tooth 122 in contact with the core seat 121 in the X-axis direction is greater than the electrical angle between the center position of the front end core 113 in the X-axis direction and the center position of the front end core 123 in the X-axis direction.

[0034] As described above, in the motor 101, the boundary surface P1 where the core seat 111 and the tooth 112 of the main tooth 11 meet is offset in a direction away from the adjacent main tooth 12. Similarly, the boundary surface P2 where the core seat 121 and the tooth 122 of the main tooth 12 meet is offset in a direction away from the adjacent main tooth 11. The boundary surfaces P1, P2 and the boundary surface P3 described later are all parallel to the XY plane.

[0035] Boundary surfaces P1 and P2 are separated from boundary surface L0, thereby increasing the distance between teeth 112 and 122, and thus increasing the winding area of ​​coils 151 and 152. The winding areas of coils 151 and 152 are the cross-sectional areas when coils 151 and 152 are cut through the XZ plane. The winding areas of coils 151 and 152 correspond to the areas that can be wound around coils 151 and 152. Figure 2, the cross section of coils 151 and 152 cut through the XZ plane is shaded. The winding area of ​​coil 151 corresponds to the total area of ​​the shaded areas shown at both ends of tooth 112, and the winding area of ​​coil 152 corresponds to the total area of ​​the shaded areas shown at both ends of tooth 122.

[0036] In the motor 101, Figure 2 The inflow direction of the coils 151 and 152 in the XZ plane is set as the winding start, and the outflow direction is set as the winding end, and the wiring is connected in such a way that the current flows into the winding start portion. In this case, the main teeth 11 and 12 are wound in opposite directions to each other, and the main tooth pair 1 and the adjacent main tooth pair 1 are wound in opposite directions to each other.

[0037] As described above, in the motor 101, the wound main tooth pairs 1 and the unwound auxiliary teeth 2 are alternately arranged, and the boundary surface P1 between the core seat 111 and the teeth 112 and the boundary surface P2 between the core seat 121 and the teeth 122 are offset in directions away from the adjacent main teeth.

[0038] Figure 3 2 is a cross-sectional view showing the structure of a motor of a comparative example. Figure 3 In the figure, it is shown that Figure 2 The cross-sectional structure of the motor 200 is shown when the motor 200 of the comparative example is viewed from the same direction as the motor 101 shown. Figure 3 In the embodiment, the axes of the coils 351 and 352 of the motor 200 are Figure 3 The XZ plane extends along the Z axis.

[0039] The motor 200 includes a movable element 15 and a stator 20. The stator 20 of the motor 200 has the same structure as the stator 20 of the motor 101.

[0040] The movable element 15 has a plurality of main tooth pairs 3 and the same number of auxiliary teeth 4 as the main tooth pairs 3. One set of main tooth pairs 3 is composed of one main tooth 31 and one main tooth 32. In the movable element 15, the main tooth pairs 3 and the auxiliary teeth 4 are alternately arranged.

[0041] The main tooth 31 includes a core base 311, a tooth 312, and a tip core 313. The tooth 312 is wound with a coil 351.

[0042] The main tooth 32 includes a core base 321, a tooth 322, and a tip core 323. The tooth 322 is wound with a coil 352.

[0043] The auxiliary tooth 4 has a core base 41, a tooth 42, and a front end core 43. No coil is wound around the tooth 42. In the auxiliary tooth 4, the tooth 42 extends in a convex shape toward the lower side of the core base 41, and the front end core 43 is arranged at the front end portion of the lower side of the tooth 42. In the auxiliary tooth 4, the thickness of the tooth 42 in the X-axis direction is the same as the thickness of the core base 41 in the X-axis direction.

[0044] The motor 200 has the same components as the motor 101 , but the shape and size of each component of the motor 200 are different from those of the motor 101 .

[0045] In the motor 200, the core base 111, the teeth 112, and the front end core 113 are replaced with the core base 311, the teeth 312, and the front end core 313. In addition, the core base 121, the teeth 122, and the front end core 123 are replaced with the core base 321, the teeth 322, and the front end core 323. In addition, the core base 21, the teeth 22, and the front end core 23 are replaced with the core base 41, the teeth 42, and the front end core 43.

[0046] In the motor 200 , the center position of the core seat 311 and the center position of the teeth 312 are the same position. Similarly, in the motor 200 , the center position of the core seat 321 and the center position of the teeth 322 are the same position.

[0047] On the other hand, in the motor 101 according to the first embodiment, the teeth 112 and 122 are arranged around a tooth center position b that is offset from the core center position a in a direction away from the adjacent main teeth.

[0048] Therefore, in the motor 200 of the comparative example, the range of the tooth 312 in the X-axis direction is X=d1~e1, but in the motor 101, the range of the tooth 112 in the X-axis direction is X=d2~e2. d2 and e2 are positions obtained by shifting d1 and e1 in a direction away from the boundary surface L0 by the position shift amount S. Similarly, in the motor 101, the range of the tooth 122 in the X-axis direction is a coordinate obtained by shifting by the position shift amount S in a direction away from the boundary surface L0.

[0049] In the motor 200 of the comparative example, the coordinate of the boundary surface P5 between the tooth 312 and the auxiliary tooth 4 in the X-axis direction is X=f1, but in the motor 101, the coordinate of the boundary surface P4 between the tooth 112 and the auxiliary tooth 2 in the X-axis direction is X=f2. If the coordinate of the boundary surface L0 in the X-axis direction is set to X=c, the distance between c to d2 is the same as the distance between e2 to f2.

[0050] Compared with the case where there is no positional offset like the motor 200 of the comparative example, in the motor 101, the winding area is increased by an amount corresponding to the positional offset amount S. That is, if the distance between the coils 151 and 152 in the Z-axis direction is set to distance z1, and the distance between the coils 351 and 352 in the Z-axis direction is set to distance z1, the winding area of ​​the coils 151 and 152 is increased by the amount of distance z1×positional offset amount S compared with the coils 351 and 352. The motor 101 can reduce copper loss and suppress heat generation by increasing the winding area.

[0051] The position offset S of the main tooth 11 relative to the spacing interval Px between the center of the core seat 21 and the center of the core seat 121 is preferably set to 0<position offset S≤(Px×0.05). That is, the position offset S is preferably less than or equal to 5% of the spacing interval Px. In order to reduce copper loss, it is considered to increase the winding area and increase the induced voltage. However, the increase in the winding area and the increase in the induced voltage are in a trade-off relationship. That is, if the position offset S is large, the winding area increases, and on the other hand, the induced voltage decreases. Conversely, if the position offset S is small, the winding area decreases, and on the other hand, the induced voltage increases. 5% of the spacing interval Px is a value where the reduction effect becomes the greatest by considering the compromise between the increase in the winding area and the increase in the induced voltage. By setting it to 0<position offset S≤(Px×0.05), the motor 101 can effectively reduce copper loss and suppress heat generation.

[0052] As described above, the distance between the center position of the tooth 112 in the main tooth 11 in the X-axis direction and the center position of the front end core 113 in the X-axis direction is less than or equal to 5% of the spacing interval Px between the center position of the tooth 112 in the X-axis direction and the center position of the tooth 22 of the auxiliary tooth 2 adjacent to the main tooth 11 in the X-axis direction.

[0053] In the motor 101, for example, the total number of main teeth 11, 12 and auxiliary teeth 2 is 9m (m is a natural number). That is, the number of main tooth pairs 1 is 3m (the total number of main teeth 11, 12 is 6m), and the number of auxiliary teeth 2 is 3m. In addition, the total number of permanent magnets 36, 37 is 7m.

[0054] Figure 1 The number of the main teeth 11, 12, the auxiliary teeth 2, and the permanent magnets 36, 37 in the motor 101 shown is an example, and the number of the main teeth 11, 12, the auxiliary teeth 2, and the permanent magnets 36, 37 is not limited to Figure 1 The number shown.

[0055] The motor 101 can be applied to a linear motor and a rotary motor, and exhibits the same effects when applied to a linear motor and when applied to a rotary motor.

[0056] As described above, in the first embodiment, the main tooth pair 1 of the motor 101 includes the main teeth 11 and 12. Moreover, in the main tooth 11, the tooth center position b of the tooth 112 in the X-axis direction is farther from the main tooth 12 than the core seat center position a of the core seat 111 in the X-axis direction. In addition, in the main tooth 12, the tooth center position b of the tooth 122 in the X-axis direction is farther from the main tooth 11 than the core seat center position a of the core seat 121 in the X-axis direction. That is, the distance between the tooth center positions b of the main teeth 11 and 12 becomes longer than the distance between the core seat center positions a of the main teeth 11 and 12. As a result, the distance between the main teeth 11 and 12 becomes longer than in the case where the tooth center position b is not offset from the core seat center position a, so that the winding area of ​​the coils 151 and 152 can be increased. Therefore, the motor 101 can improve the winding duty ratio, which is the ratio of the winding area of ​​the coils 151 and 152 to the total area of ​​the area where the teeth 112 and 122 are arranged and the winding possible area, that is, the winding area of ​​the coils 151 and 152 .

[0057] Implementation method 2.

[0058] Next, use Figure 4 Embodiment 2 will be described. In Embodiment 2, the teeth of the motor are inclined from the Z-axis direction.

[0059] Figure 4 2 is a cross-sectional view showing the structure of the electric motor according to Embodiment 2. Figure 4 In the figure, it is shown that Figure 2 The cross-sectional structure of the motor 102 is shown when the motor 102 is viewed from the same direction as the motor 101. Figure 4 In the embodiment, the axes of the coils 551 and 552 of the motor 102 are Figure 4 Extends in the Z-axis direction within the XZ plane. Figure 4 Among the structural elements of Figure 2 Components having the same functions as those of the motor 101 of the first embodiment are denoted by the same reference numerals, and duplicate descriptions thereof will be omitted.

[0060] The motor 102 includes a movable element 30B and a stator 20. The stator 20 of the motor 102 has the same structure as the stator 20 of the motor 101.

[0061] The movable element 30B has a plurality of main tooth pairs 5 and the same number of auxiliary teeth 6 as the main tooth pairs 5. One set of main tooth pairs 5 is composed of one main tooth 51 and one main tooth 52. In the movable element 30B, the main tooth pairs 5 and the auxiliary teeth 6 are alternately arranged.

[0062] The main tooth 51 includes a core base 511, a tooth 512, and a tip core 513. The tooth 512 is wound with a coil 551.

[0063] The main tooth 52 includes a core base 521, a tooth 522, and a tip core 523. A coil 552 is wound around the tooth 522.

[0064] The auxiliary tooth 6 includes a core base 61, a tooth 62, and a front end core 63. The tooth 62 is not wound with a coil.

[0065] The motor 102 has the same components as the motor 101 , but the shapes and sizes of some of the components of the motor 102 are different from those of some of the components of the motor 101 .

[0066] In the motor 102, the core base 111, the teeth 112, and the front end core 113 are replaced with the core base 511, the teeth 512, and the front end core 513. In addition, the core base 121, the teeth 122, and the front end core 123 are replaced with the core base 521, the teeth 522, and the front end core 523. In addition, the core base 21, the teeth 22, and the front end core 23 are replaced with the core base 61, the teeth 62, and the front end core 63.

[0067] The arrangement position, size and shape of the core holder 61 are the same as those of the core holder 21. The arrangement position, size and shape of the teeth 62 are the same as those of the teeth 22. The arrangement position, size and shape of the front end core 63 are the same as those of the front end core 23.

[0068] The arrangement position, size and shape of the core holders 511 and 521 are the same as those of the core holders 111 and 121 .

[0069] In the motor 102, similarly to the motor 101, the core seat center position a and the tooth center position b are offset by the position offset amount S. That is, the boundary surface P1 between the core seat 511 and the tooth 512 is offset in the direction away from the adjacent main tooth 52. Similarly, the boundary surface P2 between the core seat 521 and the tooth 522 is offset in the direction away from the adjacent main tooth 51.

[0070] The teeth 112 and 122 of the motor 101 extend in the Z-axis direction, but the axes of the teeth 512 and 522 of the motor 102 are inclined from the Z-axis direction to the X-axis direction. That is, the axis of the tooth 512 from the core base 511 to the front end core 513 is oriented toward the boundary surface L0 in the XZ plane. In addition, the axis of the tooth 522 from the core base 521 to the front end core 523 is oriented toward the boundary surface L0 in the XZ plane. In other words, in the main tooth pair 5, the main tooth 51 is inclined toward the front end core 523, and the main tooth 52 is inclined toward the front end core 513.

[0071] In addition, the configuration position of the front end core 513 is the same as the configuration position of the front end core 313, and the configuration position of the front end core 523 is the same as the configuration position of the front end core 323. The spacing between the front end cores 513 and 523 is the same as the spacing between the front end cores 113 and 123. That is, the center position of the front end core 513 in the X-axis direction is the same as the core seat center position a of the core seat 511. In addition, the center position of the front end core 523 in the X-axis direction is the same as the core seat center position a of the core seat 521.

[0072] As described above, in Embodiment 2, similarly to Embodiment 1, boundary surface P1 is offset in a direction away from core base center position a by position offset amount S. Similarly, boundary surface P2 is offset in a direction away from core base center position a by position offset amount S.

[0073] Compared with the case where there is no positional offset as in the comparative example motor 200, in the motor 102, the winding area is increased by an amount corresponding to the positional offset amount S and the inclination of the teeth 512 and 522. That is, if the distance in the Z-axis direction of the coils 551 and 552 is set to the distance z1, and the distance in the Z-axis direction of the coils 351 and 352 is set to the distance z1, the winding area of ​​the coils 551 and 552 is increased by the amount of distance z1×positional offset amount S×(1 / 2) compared to the coils 351 and 352. The motor 102 can reduce copper loss and suppress heat generation by increasing the winding area.

[0074] In the motor 102, the arrangement position, shape and size of the core holders 511 and 521 are the same as those of the core holders 111 and 121, and the arrangement position, shape and size of the front end cores 513 and 523 are the same as those of the front end cores 113 and 123. Therefore, the size of the winding area of ​​the coils 551 and 552 is the size between the winding area of ​​the coils 151 and 152 and the winding area of ​​the coils 351 and 352.

[0075] As described above, according to the second embodiment, similarly to the first embodiment, the motor 102 can improve the winding duty ratio, which is the ratio of the winding area of ​​the coils 551 and 552 to the total area of ​​the area where the teeth 512 and 522 are arranged and the winding possible area, i.e., the winding area of ​​the coils 551 and 552.

[0076] The configuration described in the above embodiment is merely an example, and may be combined with other known technologies, the embodiments may be combined with each other, and part of the configuration may be omitted or changed without departing from the gist.

[0077] Description of the label

[0078] 1, 3, 5 main tooth pairs, 2, 4, 6 auxiliary teeth, 11, 12, 31, 32, 51, 52 main teeth, 15, 30A, 30B movable parts, 20 fixed parts, 21, 41, 61, 111, 121, 311, 321, 511, 521 core seats, 22, 42, 62, 112, 122, 312, 322, 512, 522 teeth, 23, 43, 63, 113, 123, 313, 323, 513, 523 front end cores, 36, 37 permanent magnets, 101, 102, 200 motors, 151, 152, 351, 352, 551, 552 coils, 301 workpiece, 302 workbench, 303 stand, L0, P1~P5 boundary surfaces, a center position of core seat, b center position of tooth.

Claims

1. An electric motor, characterized in that: It has movable parts and fixed parts. A pair of first and second main teeth arranged at adjacent positions in a first direction, i.e., a main tooth pair, and auxiliary teeth between the main tooth pair and the main tooth pair, on which no wire is wound. The first main tooth has a first tooth connected to the core seat, and a first front end core located at a position opposite to the fixing member and connected to the front end of the first tooth. The second main tooth has a second tooth connected to the core seat, and a second front end core located at a position opposite to the fixing member and connected to the front end of the second tooth. The auxiliary teeth are extended in a direction parallel to the extension direction of the main teeth pair. The center position of the surface of the first tooth in contact with the core seat in the first direction is the same as the center position of the surface of the first tooth in contact with the first front end core in the first direction. The center position of the surface of the second tooth in contact with the core seat in the first direction is the same as the center position of the surface of the second tooth in contact with the second front end core in the first direction. The electrical angle between the center position of the surface of the first tooth in contact with the core seat in the first direction and the center position of the surface of the second tooth in contact with the core seat in the first direction is greater than the electrical angle between the center position of the first front end core in the first direction and the center position of the second front end core in the first direction.

2. The electric motor according to claim 1, characterized in that The fixing member has a plurality of permanent magnets at a first interval in the first direction. A second interval between a center position of the first front end core in the first direction and a center position of the second front end core in the first direction is equal to the first interval.

3. The electric motor according to claim 2, characterized in that The auxiliary tooth has a third tooth, The distance between the central position of the first tooth in the first main tooth and the central position of the first front end core in the first direction is greater than 0 and less than or equal to 5% of the spacing between the central position of the first tooth in the first direction and the central position of the third tooth of the auxiliary tooth adjacent to the first main tooth in the first direction.

4. The electric motor according to claim 3, characterized in that The fixing element has a permanent magnet. When m is a natural number, the number of the permanent magnets, the main tooth pairs, and the auxiliary teeth is 7m, the number of the permanent magnets is 3m, the number of the main tooth pairs is 3m, and the number of the auxiliary teeth is 3m.

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