Electric Motor

Abstract

The motor (50) has an excitation and an armature. The armature has a core seat (11), a plurality of teeth (12) and a plurality of coils (13). The plurality of teeth (12) include a first tooth, which is a tooth (12) on which only a coil (13) of one phase is installed, and a second tooth, which is a tooth (12) on which a coil (13) of multiple phases is installed. The plurality of coils (13) are respectively arranged so as not to cross slots. The number of teeth (12) of the armature is set to N, and the greatest common divisor between the number of teeth (12), i.e. N, and the number of magnetic poles of the excitation that are in a range opposite to the N teeth (12) is set to C, and a collection section consisting of N / C teeth (12) is arranged with C teeth in the direction of travel. Two second teeth are arranged continuously in the direction of travel in the collection section, or the collection section contains one second tooth.

Description

Technical Field

[0001] The present invention relates to an electric motor having teeth and coils mounted on the teeth. Background Art

[0002] Conventionally, the following electric motor is known, which sets the number of magnetic poles of the rotor to P, sets the number of teeth of the stator to N, sets the greatest common divisor of P and N to C, N / C=P / C±1, and sets N / C to an integer other than a multiple of 3, thereby reducing the cogging torque. Regarding this electric motor, Patent Document 1 discloses that the number of turns in the teeth on which only one phase of the three-phase coil is mounted is different from the total number of turns for each phase in each tooth on which multiple phases of the three-phase coil are mounted, thereby reducing the torque pulsation. The electric motor shown in Patent Document 1 has a first tooth on which only one phase of the coil is mounted and a second tooth on which multiple phases of the coil are mounted.

[0003] Patent Document 1: International Publication No. 2019 / 008848 Summary of the invention

[0004] According to the technology of Patent Document 1, the stator includes two or more second teeth, and the first tooth is arranged between the second teeth. The more the number of second teeth, that is, the more the number of coils, the more dispersed the phase of the magnetic flux generated, and the lower the distributed winding coefficient. In addition, the first tooth is arranged between the second teeth, so that the phase difference of the magnetic flux generated in the coil becomes larger, and the distributed winding coefficient decreases. The distributed winding coefficient decreases, and the heat generation of the coil increases. Therefore, in the technology of Patent Document 1, there is a problem that the heat generation of the coil increases.

[0005] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to obtain a motor capable of reducing heat generation of a coil.

[0006] In order to solve the above problems and achieve the purpose, the motor involved in the present invention has: an excitation; and an armature, which is arranged opposite to the excitation and can move relative to the excitation. The armature has: a core seat; a plurality of teeth, which extend from the core seat in the direction of the excitation and are arranged in the direction of travel of the armature relative to the excitation; and a plurality of coils, which are mounted on the plurality of teeth. The plurality of teeth include teeth, i.e., first teeth, on which only a coil of one phase is mounted, and teeth, i.e., second teeth, on which coils of multiple phases are mounted. The plurality of coils are respectively arranged so as not to cross the slots formed between mutually adjacent teeth. The number of teeth of the armature is set to N, and the greatest common divisor between the number of teeth, i.e., N, and the number of magnetic poles of the excitation in the range opposite to the N teeth is set to C, and a collection portion consisting of N / C teeth is arranged with C teeth in the direction of travel. Two second teeth are continuously arranged in the collection portion in the direction of travel, or the collection portion contains one second tooth.

[0007] Effects of the Invention

[0008] The electric motor according to the present invention has an effect of reducing heat generation of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram showing a schematic configuration of a motor system including the motor according to the first embodiment.

[0010] Figure 2 It is a cross-sectional view of the electric motor according to the first embodiment.

[0011] Figure 3 This is a diagram showing an example of the number of turns of the coil attached to each tooth in the first embodiment.

[0012] Figure 4 It is a cross-sectional view of a motor according to a comparative example of the first embodiment.

[0013] Figure 5 This is a diagram showing an example of the number of turns of the coil mounted on each tooth in a comparative example of the first embodiment.

[0014] Figure 6 1 is a vector diagram showing the induced voltage in each coil of the motor according to the first embodiment.

[0015] Figure 7 1 is a vector diagram showing the induced voltage in each coil of the motor according to the comparative example of the first embodiment.

[0016] Figure 8 This is a diagram for explaining an increase in the distributed winding coefficient in the electric motor according to the first embodiment.

[0017] Fig. 9 This is a diagram for explaining the reduction of mutual inductance achieved by the electric motor according to the first embodiment.

[0018] Fig.10 It is a cross-sectional view of the electric motor according to the second embodiment.

[0019] Fig.11 This is a diagram showing an example of the number of turns of the coil mounted on each tooth in the second embodiment.

[0020] Fig.12 It is a cross-sectional view of a motor according to a comparative example of the second embodiment.

[0021] Fig.13 This is a diagram showing an example of the number of turns of the coil mounted on each tooth in a comparative example of the second embodiment.

[0022] Fig.14 This is a vector diagram showing the induced voltage in each coil of the motor according to the second embodiment.

[0023] Fig.15 1 is a vector diagram showing the induced voltage in each coil of the motor according to the comparative example of the second embodiment.

[0024] Fig.16 This is a diagram for explaining an increase in the distributed winding coefficient in the electric motor according to the second embodiment.

[0025] Fig.17 It is a cross-sectional view of the electric motor according to the third embodiment.

[0026] Fig.18 It is a cross-sectional view of the electric motor according to the fourth embodiment.

[0027] Fig.19 This is a diagram showing an example of the number of turns of the coil mounted on each tooth in the fourth embodiment.

[0028] Fig. 20 This is a diagram for explaining an increase in the distributed winding coefficient in the electric motor according to the fourth embodiment.

[0029] Fig.21 It is a cross-sectional view of the electric motor according to the fifth embodiment. DETAILED DESCRIPTION

[0030] Hereinafter, the electric motor according to the embodiment will be described in detail with reference to the drawings.

[0031] Implementation method 1.

[0032] Figure 1 1 is a schematic diagram showing a schematic configuration of a motor system 100 including the motor 50 according to Embodiment 1. The motor system 100 includes the motor 50 , a guide portion 60 which is a linearly extending object, and a slider 70 which is movable along the guide portion 60 .

[0033] The motor 50 has a movable part 1 and a stator 2. The movable part 1 is arranged opposite to the stator 2. The stator 2 is an excitation. The movable part 1 is an armature for obtaining a thrust generated by interaction with the excitation. The movable part 1 is opposite to the stator 2 with a gap therebetween. The movable part 1 is fixed to the slider 70. The movable part 1 moves along the guide part 60 together with the slider 70 by utilizing the thrust generated by the interaction between the movable part 1 and the stator 2. The movable part 1 can move in a linear direction relative to the stator 2. That is, the movable part 1 can move relative to the stator 2. The motor 50 is a direct-acting motor that moves the movable part 1 in a linear direction. Figure 1 The double arrow shown indicates the direction in which the movable member 1 can move, that is, the direction in which the movable member 1 travels.

[0034] The stator 2 includes a stator core having a mounting seat 22 and a plurality of permanent magnets 21 disposed on the surface of the mounting seat 22. The stator core is not shown in the figure. Each permanent magnet 21 is attached to the mounting seat 22 on the surface of the stator core. The plurality of permanent magnets 21 are arranged in the direction of travel of the movable element 1.

[0035] Figure 2 It is a cross-sectional view of the electric motor 50 according to the first embodiment. Figure 2 The cross section shown is a cross section including the moving direction of the movable element 1 and the direction in which the movable element 1 and the stator 2 are opposed to each other. Figure 2 The cross section of the stator 2 shown is assumed to be a cross section of a portion of the stator 2 that faces the movable element 1 .

[0036] The movable part 1 has a movable part core and a plurality of coils 13 mounted on the movable part core. The movable part core has a core seat 11 extending in the direction of travel of the movable part 1, and a plurality of teeth 12 extending from the core seat 11 in the direction of the stator 2. In embodiment 1, the movable part 1 has five teeth 12. The five teeth 12 are arranged in the direction of travel of the movable part 1. The front end portion of the excitation side of each tooth 12 is straight. The slot in which the coil 13 is arranged is a portion adjacent to the tooth 12 in the direction of travel of the movable part 1. Slots are formed between teeth 12 adjacent to each other. Each coil 13 is formed by winding a conductive wire around the tooth 12 in a concentrated manner. That is, the plurality of coils 13 of the movable part 1 are respectively arranged so as not to cross the slot.

[0037] In Embodiment 1, four of the plurality of permanent magnets 21 arranged in the moving direction of mover 1 face five teeth 12. That is, the number of magnetic poles in the range facing five teeth 12 in the moving direction of mover 1 is four.

[0038] A voltage is applied to the movable part 1 from a three-phase AC power supply. The illustration of the three-phase AC power supply is omitted. The number of teeth 12 of the movable part 1 is set to N, and the greatest common divisor between the number of teeth 12, i.e., N, and the number of magnetic poles in a range opposite to the N teeth 12 is set to C. In the following, the number of magnetic poles is set to be the number of magnetic poles in a range opposite to the N teeth 12. In embodiment 1, the number of magnetic poles is 4, N=5 and C=1. In embodiment 1, N / C is 5, which is an integer other than a multiple of 3. N is an integer other than a multiple of 3. By satisfying this condition, the motor 50 obtains the effect of reducing the cogging torque.

[0039] In the first embodiment, for the sake of convenience, tooth numbers are assigned to the teeth 12 of the movable element 1. Figure 2 From left to right in the figure, tooth numbers t1, t2, t3, t4, and t5 are assigned to the teeth 12, respectively.

[0040] The 3-phase coils 13 are mounted on the 5 teeth 12. The -U phase coil 13 is mounted on the tooth 12 at t1. The -V phase coil 13 is mounted on the tooth 12 at t2. The +V phase coil 13 and the -W phase coil 13 are mounted on the tooth 12 at t3. The +W phase coil 13 is mounted on the tooth 12 at t4. The +U phase coil 13 is mounted on the tooth 12 at t5. "+" and "-" indicate the winding direction of the coil 13. In addition, Figure 2 The U-, V-, V+, W-, W+, and U+ shown in the figure represent the -U phase, -V phase, +V phase, -W phase, +W phase, and +U phase, respectively.

[0041] Each tooth 12 of t1, t2, t4, and t5 is a tooth 12 on which only a coil 13 of one phase is mounted. The tooth 12 of t3 is a tooth 12 on which a coil 13 of two phases is mounted. As described above, the plurality of teeth 12 of the movable part 1 include a tooth 12 on which only a coil 13 of one phase is mounted, i.e., the first tooth, and a tooth 12 on which a coil 13 of multiple phases is mounted, i.e., the second tooth. Each tooth 12 of t1, t2, t4, and t5 is a first tooth. The tooth 12 of t3 is a second tooth. The teeth 12 located at the ends of the movable part 1 in the direction of travel, i.e., the tooth 12 of t1 and the tooth 12 of t5, are respectively the first teeth.

[0042] In the motor 50, C sets of N / C teeth 12 are arranged in the traveling direction. In the first embodiment, one set of five teeth 12 is arranged in the traveling direction. In the first embodiment, one set of second teeth is included in the set 10.

[0043] Figure 3 1 is a diagram showing an example of the number of turns of the coil 13 attached to each tooth 12 in the first embodiment. Figure 3 2 shows the number of turns of the coil 13 for each phase in each tooth 12 and the total number of turns of each tooth 12 . Figure 3 The number of turns shown is a number of turns standardized based on the number of turns of the plurality of teeth 12 as a whole. Figure 3 The total number of turns shown is a total number of turns standardized based on the number of turns of the plurality of teeth 12 as a whole. That is, the number of turns of each tooth 12 and the total number of turns are expressed by the ratio to the number of turns in the entire movable element 1. Figure 3 2 shows the ratio of the number of series conductors for each phase to the number of series conductors in the entire movable element 1 .

[0044] like Figure 3As shown, the total number of turns in the tooth 12 of t3 is 0.12. The tooth 12 of t2 and the tooth 12 of t4 are the first teeth adjacent to the second tooth. The total number of turns of the tooth 12 of t2 and the tooth 12 of t4, which is 0.27, is greater than the total number of turns of the tooth 12 of t3, which is 0.12. As described above, in the aggregate 10 of the first embodiment, the total number of turns of the coil 13 in the first tooth adjacent to the second tooth is greater than the total number of turns of the coil 13 in the second tooth.

[0045] In addition, the tooth 12 of t1 and the tooth 12 of t5 are first teeth adjacent to the second tooth with one first tooth interposed therebetween. The total number of turns of the tooth 12 of t1 and the tooth 12 of t5, which is 0.17, is smaller than the total number of turns of the tooth 12 of t2 and the tooth 12 of t4, which is 0.27. As described above, in the aggregate 10 of the first embodiment, the total number of turns of the coil 13 in the first tooth adjacent to the second tooth with one first tooth interposed therebetween is smaller than the total number of turns of the coil 13 in the first tooth adjacent to the second tooth.

[0046] Here, the structure of the electric motor according to the comparative example of the first embodiment will be described. Figure 4 It is a cross-sectional view of a motor 51 according to a comparative example of the first embodiment. Figure 5 1 is a diagram showing an example of the number of turns of the coil 13 mounted on each tooth 12 in a comparative example of the first embodiment. Figure 2 Similarly, in the motor 50 shown, the movable part 1 has five teeth 12. The +U phase coil 13 is mounted on the tooth 12 at t1. The +V phase coil 13 and the -U phase coil 13 are mounted on the tooth 12 at t2. The -V phase coil 13 is mounted on the tooth 12 at t3. The +V phase coil 13 and the -W phase coil 13 are mounted on the tooth 12 at t4. The +W phase coil 13 is mounted on the tooth 12 at t5.

[0047] The integrated part 10 of the motor 51 has two second teeth. In the integrated part 10 of the motor 51, the tooth 12 of t3 as the first tooth is arranged between the tooth 12 of t2 as the second tooth and the tooth 12 of t4 as the second tooth. The number of coils 13 in the integrated part 10 of the motor 51 is greater than Figure 2 The number of coils 13 in the aggregated portion 10 of the motor 50 shown is one more. In the aggregated portion 10 of the motor 51, there is no first tooth adjacent to the second tooth with one first tooth interposed therebetween.

[0048] Figure 6 1 is a vector diagram showing the induced voltage in each coil 13 of the electric motor 50 according to the first embodiment. Figure 7 : is a vector diagram showing the induced voltage in each coil 13 of the motor 51 according to the comparative example of the first embodiment. Figure 6 and Figure 7In FIG. 1 , the vectors indicated by the solid arrows represent the amplitude and phase of the induced voltage in each coil 13 disposed on the tooth 12. Figure 6 and Figure 7 In each vector diagram of , a length twice the pitch of the permanent magnet 21 is set to a phase angle of 360 degrees. Hereinafter, a vector indicating the amplitude and phase of the induced voltage in the coil 13 is referred to as an induced voltage vector. Figure 6 The "t1_U-" shown is assumed to be the induced voltage vector of the coil 13 of the -U phase mounted on the tooth 12 of t1. Figure 6 and Figure 7 In , the induced voltage vector of each coil 13 is indicated in the same manner as in the case of "t1_U-". The vector indicated by the dotted arrow is the induced voltage vector of each phase, and is a composite vector obtained by composite the induced voltage vectors of each coil 13 for each phase.

[0049] The phase difference between adjacent teeth 12 is expressed as {360×(P / 2) / N} degrees using the number of magnetic poles, i.e., P, and the number of teeth 12, i.e., N. For example, in the motor 50, the phase difference between the tooth 12 at t1 and the tooth 12 at t2 is 360°×(4 / 2) / 5=144°. The teeth 12 of the motor 50 are configured so that the phase difference between adjacent teeth 12 is 144 degrees. In addition, the phase of the induced voltage when the winding direction is "-" is 180 degrees ahead of the phase of the induced voltage when the winding direction is "+".

[0050] The induced voltage vectors of the coils 13 are synthesized for each phase to obtain the induced voltage vectors of each phase. d That is k d，phase It is defined by the following formula (1).

[0051] [Formula 1]

[0052]

[0053] N C N represents the total number of coils 13 of each phase. phase，i (i=1、···、N C ) represents the number of turns of each coil 13. phase，i θ represents the phase of the induced voltage vector in each coil 13. phase Indicates the phase of the resultant vector of each phase. phase It is defined by the following formula (2).

[0054] [Formula 2]

[0055]

[0056] For example, the composite vector of the U phase in the motor 50 is a composite vector obtained by combining "t1_U-" and "t5_U+". If the phase of "t1_U+" is set to 0 degrees, the phase of "t1_U-" is θ U，1 is 180 degrees. The phase of "t5_U+" is θ U，2 The calculation is 144°×(5-1)=576°. U，2 Converted to an angle from 0 to 360 degrees, θ U，2 The number of turns of the coil 13 of "t1_U-" and the number of turns of the coil 13 of "t5_U+" are equal to each other, so the phase of the composite vector of the U phase, that is, θ U Calculated as (θ U，1 +θ U，2 ) / 2=(180°+216°) / 2=198°.

[0057] Distributed winding coefficient k of phase U d That is k d，U Substituting values ​​for the variables in equation (1), calculation is performed according to the following equation (3). U，1 N is the number of turns of the coil 13 constituting the U-phase coil 13, namely, the coil 13 of "t1_U-". U，2 It is the number of turns of the coil 13 constituting the U-phase coil 13, that is, the "t5_U+" coil 13.

[0058] K d，U = {N U，1 ×cos(180°-198°)+N U，2 ×cos(216°-198°)}

[0059] / (N U，1 +N U，2 )···(3)

[0060] Distributed winding coefficient k of phase V d That is k d，V and the distributed winding coefficient k of the W phase d That is k d，W can be respectively d，U The distributed winding coefficient k of all phases of the U phase, V phase and W phase is obtained by the same calculation as in the case of d The total of k d，UVW The calculation is performed using the following formula (4).

[0061] K d，UVW =(k d，U +k d，V +k d，W ) / 3· · · (4)

[0062] Figure 81 is a diagram for explaining an increase in the distributed winding coefficient in the electric motor 50 according to the first embodiment. Figure 8 , a bar graph showing the value of the distributed winding coefficient of the motor 51 involved in the comparative example and a bar graph showing the value of the distributed winding coefficient of the motor 50 involved in Embodiment 1 are shown. The value of the distributed winding coefficient is set to be a value standardized based on the value of the distributed winding coefficient of the motor 51. That is, the value of the distributed winding coefficient is represented by a ratio relative to the value of the distributed winding coefficient of the motor 51.

[0063] exist Figure 6 In the case of the first embodiment shown, there are two U-phase coils 13, two V-phase coils 13, and two W-phase coils 13. Figure 7 In the case of the comparative example shown, the number of coils 13 of the U phase is 2, the number of coils 13 of the V phase is 3, and the number of coils 13 of the W phase is 2. In the first embodiment, the number of coils 13 is one less than that in the case of the comparative example, so the same amplitude as that in the case of the comparative example can be obtained by a smaller number of turns than that in the case of the comparative example. Therefore, in the first embodiment, the distributed winding coefficient can be increased compared with the case of the comparative example.

[0064] Motor 50 adopts Figure 2 The coil configuration shown and Figure 3 The number of turns shown here is similar to that with Figure 4 The coil configuration shown and Figure 5 Compared with the case of the comparative example with the number of turns shown, the effect of increasing the distributed winding factor is obtained.

[0065] The structure in which the first teeth are arranged between the second teeth is not adopted in the motor 50. The motor 50 can increase the distributed winding factor compared with the case of the comparative example, and thus can reduce the heat generation of the coil 13 in the movable element 1.

[0066] The motor 50 can reduce the difference in induced voltage and inductance of each phase by setting the total number of turns of each tooth 12 in the above manner. As a result, the motor 50 can reduce the difference in terminal voltage of the motor 50. In addition, the motor 50 can reduce the difference in the total number of turns of each phase, so it can reduce the difference in resistance value. As a result, the motor 50 can reduce the local heating of the coil 13.

[0067] Fig. 9 1 is a diagram for explaining the reduction of mutual inductance achieved by the motor 50 according to the first embodiment. Fig. 9, a bar graph showing the value of the mutual inductance of the motor 51 involved in the comparative example and a bar graph showing the value of the mutual inductance of the motor 50 involved in the first embodiment are shown. The value of the mutual inductance is set to be a value standardized based on the value of the mutual inductance of the motor 51. That is, the value of the mutual inductance is expressed by a ratio relative to the value of the mutual inductance of the motor 51. The motor 50 adopts Figure 2 The coil configuration shown and Figure 3 The number of turns shown here is similar to that with Figure 4 The coil configuration shown and Figure 5 Compared with the case of the comparative example with the number of turns shown, the effect of reducing the mutual inductance is obtained.

[0068] In addition, the number of turns of the coil 13 mounted on each tooth 12 is not limited to Figure 3 The number of turns of the tooth 12 on which the 2-phase coil 13 is mounted does not need to be extremely large compared to the other teeth 12, and the number of turns of each tooth 12 can be combined with Figure 3 The situation shown is different. The motor 50 has a combination of the number of turns of each tooth 12 and Figure 3 In different cases, the same results as shown in Figure 3 The same effect is achieved as in the case where the number of turns of each coil 13 is set as shown.

[0069] The order of arrangement of the coils 13 on the teeth 12 on which the coils 13 of a plurality of phases are mounted is arbitrary. Figure 2 The order of the +V phase coil 13 and the -W phase coil 13 in the tooth 12 at t3 shown in FIG. Figure 2 The situation shown is the opposite. In addition, the arrangement of the coils 13 in the plurality of teeth 12 is as long as the order of the phases in the direction of travel of the movable element 1 is the same as that in the embodiment of FIG. Figure 2 If the order of the phases is the same as Figure 2 The situation shown is the same, and the phase located at the end in the traveling direction can be any phase.

[0070] In the first embodiment, the structure of the movable part 1 is set to satisfy N=5 and C=1. That is, the movable part 1 is configured such that one collection part 10 composed of five teeth 12 is arranged in the traveling direction. In the motor 50, a plurality of collection parts 10 may be arranged in the traveling direction. That is, the movable part 1 may be a structure having a plurality of collection parts 10. In this case, C is a natural number greater than 1. When C is a natural number greater than 1, the motor 50 can also obtain the above-mentioned effect in the same manner as when C is 1.

[0071] In the first embodiment, the structure of the movable member 1 is set as a structure in which a single or multiple collection parts 10 are arranged in the traveling direction. On this basis, teeth 12 without coils 13, i.e., auxiliary teeth, can be installed at both ends of the movable member 1 in the traveling direction. When the motor 50 installs auxiliary teeth at both ends of the movable member 1 in the traveling direction, the same effect as the case where no auxiliary teeth are installed can be obtained.

[0072] The plurality of teeth 12 are not limited to the case where the front end portion on the excitation side is straight. A protrusion or a depression facing the travel direction may be formed at the front end portion on the excitation side of the tooth 12. The motor 50 can obtain the same effect as the case where the teeth 12 are straight even when the protrusion or the depression is formed on the teeth 12.

[0073] In the first embodiment, the structure in which the plurality of permanent magnets 21 are attached to the mounting seat 22 on the surface of the stator core is described, but the motor 50 may also be a structure in which the plurality of permanent magnets 21 are embedded inside the stator core. In the case where the plurality of permanent magnets 21 are embedded inside the stator core, the motor 50 can obtain the same effect as the case in which the plurality of permanent magnets 21 are provided on the surface of the stator core.

[0074] According to the first embodiment, the motor 50 has a collection section 10 composed of N / C teeth 12, C of which are arranged in the traveling direction, and the number of second teeth in the collection section 10 is 1. The motor 50 can increase the distributed winding coefficient, thereby reducing the heat generation of the coil 13 in the movable part 1. As described above, the motor 50 has the effect of reducing the heat generation of the coil 13.

[0075] Implementation method 2.

[0076] Fig.10 1 is a cross-sectional view of a motor 52 according to Embodiment 2. In Embodiment 2, the arrangement of teeth 12 and coils 13 in a movable member 1 is different from that in Embodiment 1. In Embodiment 2, the same reference numerals are used for the same components as those in Embodiment 1, and the description will focus on the components different from Embodiment 1. Fig.10 The cross section of the stator 2 shown is similar to Figure 2 Similarly to the case of , it is assumed that it is a cross section of a portion of the stator 2 that faces the movable element 1 .

[0077] In the second embodiment, the number of magnetic poles is 3, N=4 and C=1. In the second embodiment, N / C is 4, which is an integer other than a multiple of 3. N is an integer other than a multiple of 3. The motor 52 can achieve the effect of reducing the cogging torque by satisfying this condition.

[0078] In the second embodiment, for the sake of convenience, tooth numbers are assigned to the teeth 12 of the movable element 1. Fig.10The teeth 12 are assigned tooth numbers t1, t2, t3, and t4 from left to right in the figure.

[0079] The three-phase coils 13 are mounted on the four teeth 12. The +U-phase coil 13 is mounted on the tooth 12 at t1. The +V-phase coil 13 and the -U-phase coil 13 are mounted on the tooth 12 at t2. The -V-phase coil 13 and the +W-phase coil 13 are mounted on the tooth 12 at t3. The -W-phase coil 13 is mounted on the tooth 12 at t4.

[0080] Each tooth 12 of t1 and t4 is a tooth 12 on which only a coil 13 of one phase is mounted. The teeth 12 of t2 and t3 are teeth 12 on which a coil 13 of two phases is mounted. As described above, the plurality of teeth 12 of the movable member 1 include teeth 12 on which only a coil 13 of one phase is mounted, i.e., first teeth, and teeth 12 on which coils 13 of multiple phases are mounted, i.e., second teeth. Each tooth 12 of t1 and t4 is a first tooth. The teeth 12 of t2 and t3 are second teeth. The teeth 12 located at the ends of the movable member 1 in the direction of travel, i.e., the teeth 12 of t1 and the teeth 12 of t4, are first teeth, respectively.

[0081] In the motor 52, C sets of the set 10 consisting of N / C teeth 12 are arranged in the traveling direction. In the second embodiment, one set 10 consisting of four teeth 12 is arranged in the traveling direction. In the second embodiment, the set 10 includes two second teeth. In the set 10, two second teeth are arranged continuously in the traveling direction. That is, the first tooth is not arranged between the second teeth.

[0082] Fig.11 1 is a diagram showing an example of the number of turns of the coil 13 mounted on each tooth 12 in the second embodiment. Fig.11 2 shows the number of turns of the coil 13 for each phase in each tooth 12 and the total number of turns of each tooth 12 . Fig.11 The number of turns shown is a number of turns standardized based on the number of turns of the plurality of teeth 12 as a whole. Fig.11 The total number of turns shown is a total number of turns standardized based on the number of turns of the plurality of teeth 12 as a whole. That is, the number of turns of each tooth 12 and the total number of turns are expressed by the ratio to the number of turns in the entire movable element 1. Fig.11 2 shows the ratio of the number of series conductors for each phase to the number of series conductors in the entire movable element 1 .

[0083] exist Fig.11In the example shown, the sum of the total number of turns in the tooth 12 of t1, i.e., 0.27, and the total number of turns in the tooth 12 of t4, i.e., 0.27, is 0.54. The sum of the total number of turns in the tooth 12 of t2, i.e., 0.23, and the total number of turns in the tooth 12 of t3, i.e., 0.23, is 0.46. As described above, in the second embodiment, the total number of turns of the coil 13 in all the first teeth included in the aggregate portion 10 is greater than the total number of turns of the coil 13 in all the second teeth included in the aggregate portion 10.

[0084] Here, the structure of the electric motor according to the comparative example of the second embodiment will be described. Fig.12 It is a cross-sectional view of a motor 53 according to a comparative example of the second embodiment. Fig.13 1 is a diagram showing an example of the number of turns of the coil 13 mounted on each tooth 12 in a comparative example of the second embodiment. Fig.10 Similarly, in the motor 52 shown, the movable part 1 has four teeth 12. The +U phase coil 13 is mounted on the tooth 12 at t1. The +V phase coil 13 and the -U phase coil 13 are mounted on the tooth 12 at t2. The +W phase coil 13 is mounted on the tooth 12 at t3. The +V phase coil 13 and the -W phase coil 13 are mounted on the tooth 12 at t4.

[0085] In the motor 53, each tooth 12 of t1 and t3 is a first tooth to which only a single-phase coil 13 is mounted. Each of the teeth 12 of t2 and t4 is mounted with a two-phase coil 13. The teeth 12 of t2 and t4 are second teeth to which a plurality of coils 13 are mounted. In the motor 53, one first tooth is arranged between the second teeth.

[0086] exist Fig.13 In the comparative example shown, the sum of the total number of turns in the teeth 12 of t1, i.e., 0.27, and the total number of turns in the teeth 12 of t3, i.e., 0.06, is 0.33. The sum of the total number of turns in the teeth 12 of t2, i.e., 0.34, and the total number of turns in the teeth 12 of t4, i.e., 0.40, is 0.74. Fig.11 Unlike the case of the second embodiment shown, the total number of turns of the coils 13 in all the first teeth included in the aggregate portion 10 is smaller than the total number of turns of the coils 13 in all the second teeth included in the aggregate portion 10 .

[0087] Fig.14 1 is a vector diagram showing the induced voltage in each coil 13 of the electric motor 52 according to the second embodiment. Fig.15 : is a vector diagram showing the induced voltage in each coil 13 of the motor 53 involved in the comparative example of the second embodiment. Fig.14 and Fig.15 In the figure, the vector indicated by the solid arrow is the induced voltage vector. Fig.14 and Fig.15In each vector diagram, the length twice the pitch of the permanent magnet 21 is set to a phase angle of 360 degrees. The vector indicated by the dotted arrow is the induced voltage vector of each phase, and is a composite vector obtained by combining the induced voltage vectors of each coil 13 for each phase.

[0088] The phase difference between adjacent teeth 12 is expressed as {360×(P / 2) / N} degrees using the number of magnetic poles, i.e., P, and the number of teeth 12, i.e., N. For example, in the motor 52, the phase difference between the tooth 12 at t1 and the tooth 12 at t2 is 360°×(3 / 2) / 4=135°. The teeth 12 of the motor 50 are arranged so that the phase difference between adjacent teeth 12 is 135 degrees. In the second embodiment, the distributed winding coefficient k of all phases of the U phase, the V phase, and the W phase is obtained by the same calculation as in the first embodiment. d The total of k d，UVW .

[0089] If you compare Fig.14 and Fig.15 , the motor 52 involved in the second embodiment has the following characteristics, namely, Fig.14 The phase difference between the synthetic vector of "t3_V-" and V phase is less than Fig.15 The phase difference between the synthetic vector of "t4 V+" and V phase.

[0090] Fig.16 2 is a diagram for explaining an increase in the distributed winding coefficient in the electric motor 52 according to the second embodiment. Fig.16 , a bar graph showing the value of the distributed winding coefficient of the motor 53 involved in the comparative example and a bar graph showing the value of the distributed winding coefficient of the motor 52 involved in Embodiment 2 are shown. The value of the distributed winding coefficient is set to be a value standardized based on the value of the distributed winding coefficient of the motor 53. That is, the value of the distributed winding coefficient is represented by a ratio relative to the value of the distributed winding coefficient of the motor 53.

[0091] Motor 52 adopts Fig.10 The coil configuration shown and Fig.11 The number of turns shown here is similar to that with Fig.12 The coil configuration shown and Fig.13 Compared with the case of the comparative example with the number of turns shown, the effect of increasing the distributed winding factor is obtained.

[0092] The structure in which the first teeth are arranged between the second teeth is not adopted in the motor 52. The motor 52 can increase the distributed winding factor compared with the case of the comparative example, and thus can reduce the heat generation of the coil 13 in the movable element 1.

[0093] The motor 52 can reduce the difference in the induced voltage and inductance of each phase by setting the total number of turns of each tooth 12 in the above manner. As a result, the motor 52 can reduce the difference in the terminal voltage of the motor 52. In addition, the motor 52 can reduce the difference in the total number of turns of each phase, so it can reduce the difference in resistance value. As a result, the motor 52 can reduce the local heating of the coil 13.

[0094] In Embodiment 2, the structure of the movable part 1 is set to satisfy N=4 and C=1. That is, the movable part 1 is configured such that one collection part 10 composed of four teeth 12 is arranged in the traveling direction. In the motor 52, a plurality of collection parts 10 may be arranged in the traveling direction. That is, the movable part 1 may be a structure having a plurality of collection parts 10. In this case, C is a natural number greater than 1. When C is a natural number greater than 1, the motor 52 can also obtain the above-mentioned effect in the same manner as when C is 1.

[0095] In Embodiment 2, the structure of the movable part 1 is set to a structure in which a single or multiple collection parts 10 are arranged in the traveling direction. On this basis, auxiliary teeth can also be installed at both ends of the movable part 1 in the traveling direction. In the case where the motor 52 is equipped with auxiliary teeth at both ends of the movable part 1 in the traveling direction, the same effect as the case where the auxiliary teeth are not installed can be obtained. In addition, similarly to the case of Embodiment 1, a protrusion or depression facing the traveling direction can be formed at the front end part of the excitation side of the tooth 12. Similar to the case of Embodiment 1, the motor 52 can be a structure in which multiple permanent magnets 21 are buried inside the stator core.

[0096] According to the second embodiment, the motor 52 is a collection part 10 composed of N / C teeth 12, C of which are arranged in the traveling direction, and two second teeth are arranged continuously in the traveling direction in the collection part 10. The motor 52 can increase the distributed winding coefficient, thereby reducing the heat generation of the coil 13 in the movable part 1. As described above, the motor 52 has the effect of reducing the heat generation of the coil 13.

[0097] Implementation method 3.

[0098] Fig.17 1 is a cross-sectional view of a motor 54 according to Embodiment 3. In Embodiment 3, the arrangement of the teeth 12 and the coil 13 in the movable member 1 is different from that in Embodiment 1 or 2. In Embodiment 3, the same reference numerals are given to the same structural elements as those in Embodiment 1 or 2, and the structure different from that in Embodiment 1 or 2 is mainly described. Fig.17 The cross section of the stator 2 shown is similar to Figure 2 Similarly to the case of , it is assumed that it is a cross section of a portion of the stator 2 that faces the movable element 1 .

[0099] In the third embodiment, the number of magnetic poles is 4, N=5 and C=1. In the third embodiment, N / C is 5, which is an integer other than a multiple of 3. N is an integer other than a multiple of 3. The motor 54 can achieve the effect of reducing the cogging torque by satisfying this condition.

[0100] In the third embodiment, for the sake of convenience, tooth numbers are assigned to the teeth 12 of the movable element 1. Fig.17 The teeth 12 are respectively assigned tooth numbers t2, t3, t4, t5, and t1 from left to right.

[0101] The three-phase coils 13 are mounted on the five teeth 12. The -V phase coil 13 is mounted on the tooth 12 at t2. The +V phase coil 13 and the -W phase coil 13 are mounted on the tooth 12 at t3. The +W phase coil 13 is mounted on the tooth 12 at t4. The +U phase coil 13 is mounted on the tooth 12 at t5. The -U phase coil 13 is mounted on the tooth 12 at t1.

[0102] The teeth 12 of t2, t4, t5, and t1 are teeth 12 on which only one-phase coil 13 is mounted. The tooth 12 of t3 is a tooth 12 on which two-phase coil 13 is mounted. As described above, the plurality of teeth 12 of the movable member 1 include teeth 12 on which only one-phase coil 13 is mounted, i.e., first teeth, and teeth 12 on which multiple-phase coil 13 is mounted, i.e., second teeth. The teeth 12 of t2, t4, t5, and t1 are first teeth. The tooth 12 of t3 is the second tooth. The teeth 12 of t2 and the tooth 12 of t1, which are located at the ends of the movable member 1 in the direction of travel, are first teeth, respectively.

[0103] In the motor 54, C sets of N / C teeth 12 are arranged in the traveling direction. In the third embodiment, one set of five teeth 12 is arranged in the traveling direction. In the third embodiment, one set of second teeth is included in the set 10.

[0104] An insulator for phase insulation is mounted on the second tooth. In the second tooth, the winding area is reduced by the amount of the insulator compared to the first tooth. In addition, a protective component for protecting the coil 13 is mounted on the tooth 12 located at the end of the moving part 1 in the direction of travel. In the tooth 12 located at the end, the winding area is reduced by the amount of the protective component compared to the tooth 12 at a position other than the end.

[0105] Assuming that the second tooth is disposed at the end of the moving direction of the movable member 1, an insulator and a protective member are installed on the second tooth, thereby significantly reducing the winding area in the second tooth. In order to increase the number of turns, a coil 13 formed of a thin wire is installed in the second tooth. In this case, the wire diameter becomes thinner, thereby increasing the heat generation of the coil 13.

[0106] In the motor 54, the tooth 12 located at the end of the moving part 1 in the moving direction is the first tooth, thereby preventing the winding area from being locally reduced in the tooth 12 located at the end of the moving direction among the plurality of teeth 12. The coil 13 formed of a wire with a thick wire diameter can be arranged at the first tooth located at the end of the moving direction, thereby reducing the heat generated by the coil 13. As described above, the motor 54 has the following effect, that is, since the tooth 12 located at the end of the moving part 1 in the moving direction is the first tooth, the heat generated by the coil 13 can be reduced.

[0107] In the first and second embodiments, since the teeth 12 of the motors 50 and 52 located at the end of the movable element 1 in the moving direction are the first teeth, the effect of reducing the heat generation of the coil 13 can be obtained.

[0108] In Embodiment 3, the movable member 1 is configured such that one collection section 10 consisting of five teeth 12 is arranged in the traveling direction. In the motor 54, a plurality of collection sections 10 may be arranged in the traveling direction. That is, the movable member 1 may be configured to have a plurality of collection sections 10. In this case, C is a natural number greater than 1. The motor 54 can also obtain the above-mentioned effect in the same manner as when C is 1 when C is a natural number greater than 1.

[0109] In Embodiment 3, the structure of the movable part 1 is set to a structure in which a single or multiple collection parts 10 are arranged in the traveling direction. On this basis, auxiliary teeth can also be installed at both ends of the movable part 1 in the traveling direction. In the case where the motor 54 installs auxiliary teeth at both ends of the movable part 1 in the traveling direction, the same effect as the case where the auxiliary teeth are not installed can be obtained. In addition, similarly to the case of Embodiment 1 or 2, a protrusion or depression facing the traveling direction can be formed at the front end part of the excitation side of the tooth 12. Similar to the case of Embodiment 1 or 2, the motor 54 can be a structure in which multiple permanent magnets 21 are buried inside the stator core.

[0110] Implementation method 4.

[0111] Fig.18 1 is a cross-sectional view of a motor 55 according to Embodiment 4. In Embodiment 4, the arrangement of the teeth 12 and the coil 13 in the movable member 1 is different from that in Embodiments 1 to 3. In Embodiment 4, the same reference numerals are given to the same components as those in Embodiments 1 to 3, and the description will be mainly made of the components different from Embodiments 1 to 3. Fig.18 The cross section of the stator 2 shown is similar to Figure 2 Similarly to the case of , it is assumed that it is a cross section of a portion of the stator 2 that faces the movable element 1 .

[0112] In the fourth embodiment, the number of magnetic poles is 3, N=4 and C=1. In the fourth embodiment, N / C is 4, which is an integer other than a multiple of 3. N is an integer other than a multiple of 3. The motor 55 can achieve the effect of reducing the cogging torque by satisfying this condition.

[0113] In the fourth embodiment, for the sake of convenience, tooth numbers are assigned to the teeth 12 of the movable element 1. Fig.18 The teeth 12 are assigned tooth numbers t1, t2, t3, and t4 from left to right in the figure.

[0114] The three-phase coils 13 are mounted on the four teeth 12. The +U-phase coil 13 is mounted on the tooth 12 at t1. The +V-phase coil 13 is mounted on the tooth 12 at t2. The +W-phase coil 13 and the -V-phase coil 13 are mounted on the tooth 12 at t3. The -W-phase coil 13 is mounted on the tooth 12 at t4.

[0115] Each tooth 12 of t1, t2, and t4 is a tooth 12 on which only a single-phase coil 13 is mounted. The tooth 12 of t3 is a tooth 12 on which a two-phase coil 13 is mounted. As described above, the plurality of teeth 12 of the movable part 1 include a tooth 12 on which only a single-phase coil 13 is mounted, i.e., the first tooth, and a tooth 12 on which multiple-phase coils 13 are mounted, i.e., the second tooth. Each tooth 12 of t1, t2, and t4 is a first tooth. The tooth 12 of t3 is a second tooth. The tooth 12 at the end of the movable part 1 in the direction of travel, i.e., the tooth 12 of t1 and the tooth 12 of t4, are respectively the first teeth. Since the tooth 12 at the end of the movable part 1 in the direction of travel is the first tooth, the motor 55 can reduce the heating of the coil 13.

[0116] In the motor 55, C sets of N / C teeth 12 are arranged in the traveling direction. In the fourth embodiment, one set of four teeth 12 is arranged in the traveling direction. In the fourth embodiment, the number of second teeth in the set 10 is one.

[0117] Fig.19 1 is a diagram showing an example of the number of turns of the coil 13 mounted on each tooth 12 in the fourth embodiment. Fig.19 2 shows the number of turns of the coil 13 for each phase in each tooth 12 and the total number of turns of each tooth 12 . Fig.19 The number of turns shown is a number of turns standardized based on the number of turns of the plurality of teeth 12 as a whole. Fig.19 The total number of turns shown is a total number of turns standardized based on the number of turns of the plurality of teeth 12 as a whole. That is, the number of turns of each tooth 12 and the total number of turns are expressed by the ratio relative to the number of turns in the entire movable element 1. Fig.19 2 shows the ratio of the number of series conductors for each phase to the number of series conductors in the entire movable element 1 .

[0118] like Fig.19 As shown, the total number of turns in the tooth 12 of t3 is 0.23. The tooth 12 of t2 and the tooth 12 of t4 are the first teeth adjacent to the second tooth, respectively. The tooth 12 of t1 is the first tooth adjacent to the second tooth with one first tooth in between. The total number of turns in the tooth 12 of t1, i.e., 0.32, is greater than the total number of turns of the tooth 12 of t2 and the tooth 12 of t4, i.e., 0.23. As described above, in the collection portion 10 of the fourth embodiment, the total number of turns of the coil 13 in the first tooth adjacent to the second tooth with one first tooth in between is greater than the total number of turns of the coil 13 in the first tooth adjacent to the second tooth.

[0119] Fig. 20 1 is a diagram for explaining an increase in the distributed winding coefficient in the motor 55 according to the fourth embodiment. Fig.12 The structure of the motor 53 shown in FIG. Fig. 20 , a bar graph showing the value of the distributed winding coefficient of the motor 53 involved in the comparative example, and a bar graph showing the value of the distributed winding coefficient of the motor 55 involved in Embodiment 4 are shown. The value of the distributed winding coefficient is set to be a value standardized based on the value of the distributed winding coefficient of the motor 53. That is, the value of the distributed winding coefficient is expressed by a ratio relative to the value of the distributed winding coefficient of the motor 53.

[0120] Motor 55 adopts Fig.18 The coil configuration shown and Fig.19 The number of turns shown here is similar to that with Fig.12 The coil configuration shown and Fig.13 Compared with the case of the comparative example with the number of turns shown, the effect of increasing the distributed winding factor is obtained.

[0121] The structure in which the first teeth are arranged between the second teeth is not adopted in the motor 55. The motor 55 can increase the distributed winding factor compared with the case of the comparative example, and thus can reduce the heat generation of the coil 13 in the movable element 1.

[0122] The motor 55 sets the total number of turns of each tooth 12 in the above manner, thereby reducing the difference in induced voltage of each phase and reducing the difference in inductance of each phase. In addition, the motor 55 can increase the distributed winding coefficient. The motor 55 can reduce the current value when the same thrust is obtained, thereby reducing the heating of the coil 13. As described above, the motor 55 has the effect of reducing the heating of the coil 13.

[0123] In Embodiment 4, the movable member 1 is configured such that one collection section 10 composed of four teeth 12 is arranged in the traveling direction. In the motor 55, a plurality of collection sections 10 may be arranged in the traveling direction. That is, the movable member 1 may be configured to have a plurality of collection sections 10. In this case, C is a natural number greater than 1. The motor 55 can obtain the above-mentioned effect in the same manner as when C is 1, even when C is a natural number greater than 1.

[0124] In Embodiment 4, the structure of the movable part 1 is set to a structure in which a single or multiple collection parts 10 are arranged in the traveling direction. On this basis, auxiliary teeth can be installed at both ends of the movable part 1 in the traveling direction. In the case where the motor 55 is equipped with auxiliary teeth at both ends of the moving part 1 in the traveling direction, the same effect as the case where the auxiliary teeth are not installed can be obtained. In addition, similarly to the cases of Embodiments 1 to 3, a protrusion or depression facing the traveling direction can be formed at the front end part of the excitation side of the tooth 12. Similar to the cases of Embodiments 1 to 3, the motor 55 can be a structure in which multiple permanent magnets 21 are buried inside the stator core.

[0125] Implementation method 5.

[0126] Fig.21 1 is a cross-sectional view of a motor 56 according to Embodiment 5. In Embodiment 5, the arrangement of each coil 13 in the tooth 12 of t3 as the second tooth is similar to Figure 2 The structure of the motor 56 is the same as that of the motor 50 except that the arrangement of each coil 13 in the tooth 12 of t3 is different from that of the motor 50. In the fifth embodiment, the same reference numerals are given to the same structural elements as those in the first to fourth embodiments, and the structures different from the first to fourth embodiments are mainly described. Fig.21 The cross section of the stator 2 shown is similar to Figure 2 Similarly to the case of , a cross section of a portion of the stator 2 facing the movable element 1 is taken.

[0127] Each tooth 12 extends from the core base 11 toward the stator 2. The direction from the core base 11 toward the stator 2 is defined as the length direction of the tooth 12. Figure 2 In the tooth 12 at t3 shown in FIG. 1 , the coil 13 of the +V phase and the coil 13 of the −W phase are adjacent to each other in the length direction of the tooth 12. Fig.21 In the tooth 12 of t3 shown, the coil 13 of the +V phase is wound on the side of the tooth 12, that is, on the inner side. The coil 13 of the -W phase is wound on the outer side of the coil 13 of the +V phase. That is, in the tooth 12 of t3, in addition to the coil 13 of the +V phase, the coil 13 of the -W phase is also installed. In addition, in the tooth 12 of t3, in addition to the coil 13 of the -W phase, the coil 13 of the +V phase may also be installed.

[0128] As described in Embodiment 5, by configuring each coil 13 with the second tooth, the position where the winding of the coil 13 starts and the position where the winding of the coil 13 ends can be aligned to the position in contact with the core seat 11. That is, for all the coils 13 possessed by the movable part 1, the position where the winding of the coil 13 starts and the position where the winding of the coil 13 ends can be aligned with the core seat 11 side. In this case, the distance from the position where the winding of the coil 13 ends to the neutral point, or the distance from the position where the winding of the coil 13 starts to the terminal can be minimized, and the resistance of the coil 13 can be reduced. As a result, the motor 56 obtains the effect of reducing the heat generation of the coil 13.

[0129] As described in Embodiment 5, by arranging the coils 13 with the second teeth, the magnetic flux passing through the coils 13 can be kept the same. Therefore, the motor 56 can reduce the difference in inductance between the phases, thereby reducing the difference in terminal voltage of the motor 56.

[0130] In the fifth embodiment, the movable part 1 is configured such that one collection part 10 composed of five teeth 12 is arranged in the traveling direction. In the motor 56, a plurality of collection parts 10 may be arranged in the traveling direction. That is, the movable part 1 may be configured to have a plurality of collection parts 10. In this case, C is a natural number greater than 1. The motor 56 can also obtain the above-mentioned effect in the same manner as when C is 1 when C is a natural number greater than 1.

[0131] In Embodiment 5, the structure of the movable part 1 is set to a structure in which a single or multiple collection parts 10 are arranged in the traveling direction. On this basis, auxiliary teeth can be installed at both ends of the movable part 1 in the traveling direction. In the case where the motor 56 installs auxiliary teeth at both ends of the movable part 1 in the traveling direction, the same effect as the case where the auxiliary teeth are not installed can be obtained. In addition, as in the case of Embodiments 1 to 4, a protrusion or depression facing the traveling direction can be formed at the front end of the excitation side of the tooth 12. As in the case of Embodiments 1 to 4, the motor 56 can be a structure in which multiple permanent magnets 21 are buried inside the stator core.

[0132] The structures of the motors 50, 52, 54, 55, and 56 according to the first to fifth embodiments can also be applied to a rotary electric machine. A rotary electric machine is a motor having a stator and a rotor and rotating the rotor. When the structures of the motors 50, 52, 54, 55, and 56 are applied to a rotary electric machine, the same effects as those of the motors 50, 52, 54, 55, and 56 can be obtained.

[0133] The structures shown in the above embodiments illustrate an example of the content of the present invention. The structures of the embodiments can be combined with other known technologies. The structures of the embodiments can also be appropriately combined with each other. Part of the structure of the embodiments can be omitted or changed without departing from the scope of the gist of the present invention.

[0134] Description of the label

[0135] 1 movable part, 2 stator, 10 collecting part, 11 core seat, 12 teeth, 13 coil, 21 permanent magnet, 22 mounting seat, 50, 51, 52, 53, 54, 55, 56 motor, 60 guide part, 70 slider, 100 motor system.

Claims

1. An electric motor, characterized in that: have: Excitation; and an armature disposed opposite to the excitation field and capable of relative movement with respect to the excitation field, The armature comprises: a core seat; a plurality of teeth, which extend from the core seat in the direction of the excitation and are arranged in the direction of travel of the armature relative to the excitation; and a plurality of coils, which are mounted on the plurality of teeth. The plurality of teeth include first teeth on which only the coil of one phase is mounted, and second teeth on which the coils of multiple phases are mounted. The plurality of coils are arranged so as not to cross slots formed between adjacent teeth. The number of teeth of the armature is N, the greatest common divisor between the number of teeth, i.e., N, and the number of magnetic poles of the excitation that are in a range opposite to the N teeth is C, and the number of sets consisting of N / C teeth is C in the direction of travel, In the aggregate portion, two of the second teeth are continuously arranged in the traveling direction, or the aggregate portion includes only one second tooth.

2. The electric motor according to claim 1, characterized in that The tooth located at an end portion of the armature in the traveling direction is the first tooth.

3. The electric motor according to claim 1 or 2, characterized in that: N / C is 4, and the number of the second teeth included in the set portion is one, The total number of turns of the coil in the first tooth adjacent to the second tooth across one of the first teeth is greater than the total number of turns of the coil in the first tooth adjacent to the second tooth.

4. The electric motor according to claim 1 or 2, characterized in that: N / C is 4, and the number of the second teeth included in the set portion is 2, The total number of turns of the coils in all the first teeth included in the collection portion is greater than the total number of turns of the coils in all the second teeth included in the collection portion.

5. The electric motor according to claim 1 or 2, characterized in that: N / C is 5, and the number of the second teeth included in the set portion is one, The total number of turns of the coil in the first tooth adjacent to the second tooth is greater than the total number of turns of the coil in the second tooth, and the total number of turns of the coil in the first tooth adjacent to the second tooth with one first tooth in between is less than the total number of turns of the coil in the first tooth adjacent to the second tooth.

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