CN118160193A

CN118160193A - Motor with a motor housing having a motor housing with a motor housing

Info

Publication number: CN118160193A
Application number: CN202280071968.6A
Authority: CN
Inventors: 高村优; 广谷迪; 扎伊尼·阿里夫; 榊原功太郎; 桥本健太郎
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2024-06-07
Also published as: WO2023203646A1; JPWO2023203646A1; JP7191279B1; DE112022004572T5; KR20240096775A

Abstract

The motor (50) has a field and an armature. The armature has a core holder (11), a plurality of teeth (12), and a plurality of coils (13). The plurality of teeth (12) includes 1 st tooth which is a tooth (12) to which only the coil (13) of 1 phase is attached, and 2 nd tooth which is a tooth (12) to which the coil (13) of a plurality of phases is attached. The plurality of coils (13) are respectively arranged so as not to cross the slots. The number of teeth (12) of an armature is N, the greatest common divisor between N, which is the number of teeth (12), and the number of excited magnetic poles in the range facing the N teeth (12), is C, and the number of the aggregation parts formed by N/C teeth (12) is C in the traveling direction. 2 nd teeth are arranged continuously in the running direction in the collecting portion, or 1 nd tooth included in the collecting portion.

Description

Motor with a motor housing having a motor housing with a motor housing

Technical Field

The present invention relates to an electric motor having teeth and coils mounted to the teeth.

Background

Conventionally, there is known a motor in which the cogging torque can be reduced by setting the number of poles of a rotor to P, the number of teeth of a stator to N, the greatest common divisor of P and N to C, N/c=p/c±1, and N/C to an integer other than a multiple of 3. With respect to this motor, patent document 1 discloses that torque ripple can be reduced by making the total of the number of turns in the tooth on which only 1 phase coil out of 3 phases is mounted and the number of turns per phase in each tooth on which a plurality of phases coil out of 3 phases are mounted different. The motor shown in patent document 1 has a1 st tooth to which only a 1-phase coil is attached and a2 nd tooth to which a plurality of phases of coils are attached.

Patent document 1: international publication No. 2019/008848

Disclosure of Invention

According to the technique of patent document 1, the stator includes 2 or more 2 nd teeth, and the 1 st tooth is disposed between the 2 nd teeth and the 2 nd teeth. The more the number of teeth 2, that is, the more the number of coils, the more the phase of the generated magnetic flux is dispersed, and the lower the distributed winding coefficient. Further, by disposing the 1 st tooth between the 2 nd tooth and the 2 nd tooth, the phase difference of the magnetic fluxes generated in the coil becomes large, and the distributed winding coefficient is reduced. The distributed winding coefficient decreases, and thereby the heat generation of the coil increases. Therefore, the technique of patent document 1 has a problem that heat generation of the coil increases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a motor capable of reducing heat generation of a coil.

In order to solve the above problems and achieve the object, a motor according to the present invention includes: exciting; and an armature disposed so as to face the excitation, the armature being movable relative to the excitation. The armature has: a core seat; a plurality of teeth extending from the core holder in the direction of excitation, respectively, and arranged in the direction of travel of the armature with respect to the excitation; and a plurality of coils mounted to the plurality of teeth. The plurality of teeth includes a1 st tooth which is a tooth to which only a 1-phase coil is attached and a2 nd tooth which is a tooth to which a plurality of phases of coils are attached. The plurality of coils are respectively arranged so as not to cross the slots formed between the teeth adjacent to each other. The number of teeth of the armature is N, the greatest common divisor between N, which is the number of teeth, and the number of field poles in the range facing the N teeth is C, and the number of the aggregation parts made up of N/C teeth is C in the traveling direction. 2 nd teeth are arranged continuously in the running direction in the collecting portion, or 1 nd tooth included in the collecting portion.

ADVANTAGEOUS EFFECTS OF INVENTION

The motor according to the present invention has an effect of reducing heat generation of the coil.

Drawings

Fig. 1 is a schematic diagram showing a schematic configuration of a motor system including a motor according to embodiment 1.

Fig. 2 is a cross-sectional view of the motor according to embodiment 1.

Fig. 3 is a diagram showing an example of the number of turns of the coil attached to each tooth in embodiment 1.

Fig. 4 is a cross-sectional view of the motor according to the comparative example of embodiment 1.

Fig. 5 is a diagram showing an example of the number of turns of the coil attached to each tooth in the comparative example of embodiment 1.

Fig. 6 is a vector diagram showing induced voltages in each coil of the motor according to embodiment 1.

Fig. 7 is a vector diagram showing induced voltages in each coil of the motor according to the comparative example of embodiment 1.

Fig. 8 is a diagram for explaining an increase in the distributed winding coefficient in the motor according to embodiment 1.

Fig. 9 is a diagram for explaining reduction of mutual inductance by the motor according to embodiment 1.

Fig. 10 is a cross-sectional view of the motor according to embodiment 2.

Fig. 11 is a diagram showing an example of the number of turns of the coil attached to each tooth in embodiment 2.

Fig. 12 is a cross-sectional view of a motor according to a comparative example of embodiment 2.

Fig. 13 is a diagram showing an example of the number of turns of the coil attached to each tooth in the comparative example of embodiment 2.

Fig. 14 is a vector diagram showing induced voltages in each coil of the motor according to embodiment 2.

Fig. 15 is a vector diagram showing induced voltages in each coil of the motor according to the comparative example of embodiment 2.

Fig. 16 is a diagram for explaining an increase in the distributed winding coefficient in the motor according to embodiment 2.

Fig. 17 is a cross-sectional view of the motor according to embodiment 3.

Fig. 18 is a cross-sectional view of the motor according to embodiment 4.

Fig. 19 is a diagram showing an example of the number of turns of the coil attached to each tooth in embodiment 4.

Fig. 20 is a diagram for explaining an increase in the distributed winding coefficient in the motor according to embodiment 4.

Fig. 21 is a cross-sectional view of the motor according to embodiment 5.

Detailed Description

The motor according to the embodiment will be described in detail below with reference to the drawings.

Embodiment 1.

Fig. 1 is a schematic diagram showing a schematic configuration of a motor system 100 including a motor 50 according to embodiment 1. The motor system 100 includes a motor 50, a guide 60 which is a linearly extending object, and a slider 70 movable along the guide 60.

The motor 50 has a movable member 1 and a stator 2. The movable element 1 is disposed opposite to the stator 2. The stator 2 is excited. The movable element 1 is an armature for obtaining thrust generated by interaction with excitation. The movable element 1 faces the stator 2 with a gap therebetween. The movable element 1 is fixed to the slider 70. The movable element 1 moves along the guide portion 60 together with the slider 70 by thrust generated by the interaction of the movable element 1 and the stator 2. The movable element 1 is movable in a linear direction with respect to the stator 2. That is, the movable element 1 is relatively movable with respect to the stator 2. The motor 50 is a linear motor that moves the movable element 1 in a linear direction. The double arrow shown in fig. 1 indicates the direction in which the movable element 1 can move, that is, the traveling direction of the movable element 1.

The stator 2 has: a stator core having a mount 22; and a plurality of permanent magnets 21 provided on the surface of the mount 22. The illustration of the stator core is omitted. Each permanent magnet 21 is attached to a mount 22 on the surface of the stator core. The plurality of permanent magnets 21 are aligned in the traveling direction of the movable element 1.

Fig. 2 is a cross-sectional view of the motor 50 according to embodiment 1. The cross section shown in fig. 2 includes the traveling direction of the movable element 1 and the direction in which the movable element 1 and the stator 2 face each other. The cross section of the stator 2 shown in fig. 2 is a cross section of a portion of the stator 2 facing the movable element 1.

The movable element 1 has a movable element core and a plurality of coils 13 attached to the movable element core. The movable element core includes a core seat 11 extending in the traveling direction of the movable element 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 element 1 has 5 teeth 12. The 5 teeth 12 are aligned in the traveling direction of the movable element 1. The excitation-side tip portion of each tooth 12 is straight. The groove in which the coil 13 is disposed is a portion adjacent to the tooth 12 in the traveling direction of the movable element 1. The teeth 12 adjacent to each other form a groove therebetween. Each coil 13 is formed by winding a wire around the teeth 12 in a concentrated manner. That is, the plurality of coils 13 included in the movable element 1 are arranged so as not to cross the grooves.

In embodiment 1, 4 of the plurality of permanent magnets 21 aligned in the traveling direction of the movable element 1 are opposed to 5 teeth 12. That is, the number of magnetic poles in the range facing 5 teeth 12 in the traveling direction of the movable element 1 is 4.

A voltage is applied from a 3-phase ac power source to the movable element 1. The illustration of the 3-phase ac power supply is omitted. The number of teeth 12 of the movable element 1 is N, and the greatest common divisor between N, which is the number of teeth 12, and the number of magnetic poles in the range facing the N teeth 12 is C. Next, the number of magnetic poles is set to be the number of magnetic poles in the 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, and is an integer other than a multiple of 3. N is an integer other than a multiple of 3. The motor 50 satisfies this condition, and thus has an effect of reducing the cogging torque.

In embodiment 1, each tooth 12 of the movable element 1 is assigned a tooth number for convenience. In fig. 2, each tooth 12 is assigned a tooth number t1, t2, t3, t4, and t5 from left to right.

A 3-phase coil 13 is mounted on 5 teeth 12. The teeth 12 at t1 are fitted with coils 13 of the-U phase. The teeth 12 at t2 are fitted with coils 13 of-V phase. The teeth 12 at t3 are fitted with a +v phase coil 13 and a-W phase coil 13. A coil 13 of +w phase is mounted on the tooth 12 at t 4. A coil 13 of +u phase is mounted on the tooth 12 at t 5. "+" and "-" indicate winding directions of the coils 13. In addition, U-, V-, V+, W-, W+, U+ shown in FIG. 2 represent the-U phase, -V phase, +V phase, -W phase, +W phase, +U phase, respectively.

Each tooth 12 of t1, t2, t4, t5 is a tooth 12 to which only the coil 13 of phase 1 is attached. the tooth 12 of t3 is the tooth 12 on which the coil 13 of 2 phases is mounted. As described above, the plurality of teeth 12 of the movable element 1 include the 1 st tooth which is the tooth 12 to which only the 1-phase coil 13 is attached, and the 2 nd tooth which is the tooth 12 to which the plurality of phase coils 13 are attached. Each tooth 12 of t1, t2, t4, t5 is the 1 st tooth. tooth 12 of t3 is tooth 2. The teeth 12 at the end in the traveling direction among the movable element 1, that is, the teeth 12 of t1 and the teeth 12 of t5 are the 1 st teeth, respectively.

In the motor 50, the collection portion 10 composed of N/C teeth 12 is arranged with C in the traveling direction. In embodiment 1, 1 aggregate 10 of 5 teeth 12 is arranged in the traveling direction. In embodiment 1, the number of teeth 2 included in the aggregation unit 10 is 1.

Fig. 3 is a diagram showing an example of the number of turns of the coil 13 attached to each tooth 12 in embodiment 1. 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 are shown in fig. 3. The number of turns shown in fig. 3 is set to be a number of turns normalized based on the number of turns of the plurality of teeth 12 as a whole. The total number of turns shown in fig. 3 is normalized based on the number of turns of the entire plurality of teeth 12. That is, the ratio of the number of turns to the whole movable element 1 indicates the number of turns of each tooth 12 and the total number of turns. Fig. 3 shows a ratio of the number of series conductors for each phase to the number of series conductors in the whole movable element 1.

As shown in fig. 3, the total number of turns in the tooth 12 of t3 is 0.12. teeth 12 of t2 and teeth 12 of t4 are each the 1 st tooth adjacent to the 2 nd tooth. the total number of turns of each of the teeth 12 of t2 and the teeth 12 of t4 is 0.27, which is 0.12 more than the total number of turns of the teeth 12 of t 3. As described above, in the assembly 10 of embodiment 1, the total number of turns of the coil 13 in the 1 st tooth adjacent to the 2 nd tooth is larger than the total number of turns of the coil 13 in the 2 nd tooth.

The tooth 12 of t1 and the tooth 12 of t5 are 1 st tooth adjacent to the 2 nd tooth with 1 st tooth interposed therebetween. the total number of turns of each of teeth 12 and 12 of t5 of t1, i.e., 0.17, is less than the total number of turns of each of teeth 12 and 12 of t4 of t2, i.e., 0.27. As described above, in the assembly portion 10 according to embodiment 1, the total number of turns of the coils 13 in the 1 st tooth adjacent to the 2 nd tooth with 1 st tooth interposed therebetween is smaller than the total number of turns of the coils 13 in the 1 st tooth adjacent to the 2 nd tooth.

Here, the structure of the motor according to the comparative example of embodiment 1 will be described. Fig. 4 is a cross-sectional view of a motor 51 according to a comparative example of embodiment 1. Fig. 5 is a diagram showing an example of the number of turns of the coil 13 attached to each tooth 12 in the comparative example of embodiment 1. Like the motor 50 shown in fig. 2, the movable element 1 has 5 teeth 12. A coil 13 of +u phase is mounted on the tooth 12 of t 1. The teeth 12 at t2 are fitted with a +v phase coil 13 and a-U phase coil 13. The tooth 12 at t3 is fitted with a coil 13 of-V phase. The teeth 12 at t4 are fitted with a +v phase coil 13 and a-W phase coil 13. A coil 13 of +w phase is mounted on the tooth 12 at t 5.

The aggregate portion 10 of the motor 51 has 2 nd teeth. In the assembly portion 10 of the motor 51, the tooth 12 of t3 which is the 1 st tooth is arranged between the tooth 12 of t2 which is the 2 nd tooth and the tooth 12 of t4 which is the 2 nd tooth. The number of coils 13 in the assembly 10 of the motor 51 is 1 more than the number of coils 13 in the assembly 10 of the motor 50 shown in fig. 2. In addition, 1 st tooth adjacent to 2 nd tooth with 1 st tooth interposed therebetween does not exist in the assembly portion 10 of the motor 51.

Fig. 6 is a vector diagram showing induced voltages in each coil 13 of the motor 50 according to embodiment 1. Fig. 7 is a vector diagram showing induced voltages in each coil 13 of the motor 51 according to the comparative example of embodiment 1. In fig. 6 and 7, vectors indicated by solid arrows indicate the amplitudes and phases of induced voltages in the coils 13 disposed in the teeth 12. In each of the vector diagrams of fig. 6 and 7, the length 2 times the pitch of the permanent magnets 21 is set to 360 degrees in phase angle. Hereinafter, a vector representing the amplitude and phase of the induced voltage in the coil 13 is referred to as an induced voltage vector. "t1_u-" shown in fig. 6 is set as an induced voltage vector of the coil 13 of the-U phase of the tooth 12 mounted on t 1. In fig. 6 and 7, the induced voltage vector of each coil 13 is labeled in the same manner as in the case of "t1_u-". The vector indicated by the broken-line arrow is an induced voltage vector of each phase, and is a synthesized vector obtained by synthesizing the induced voltage vectors of the coils 13 for each phase.

The phase difference between the teeth 12 adjacent to each other 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 teeth 12 of t1 and the teeth 12 of t2 is 360 ° × (4/2)/5=144°. The teeth 12 of the motor 50 are arranged such that the phase difference between the adjacent teeth 12 becomes 144 degrees. Further, the phase of the induced voltage in the case where the winding direction is "-" is advanced 180 degrees with respect to the phase of the induced voltage in the case where the winding direction is "+".

The induced voltage vectors of the coils 13 are synthesized for each phase, and the induced voltage vector of each phase is obtained. The distributed winding coefficient k _d, that is, k _d,phase of each phase is defined by the following formula (1).

[ 1]

N _C represents the total number of coils 13 of each phase. N _phase,i(i＝1、···、N_C) represents the number of turns of each coil 13.θ _phase,i represents the phase of the induced voltage vector in each coil 13.θ _phase represents the phase of the composite vector of each phase. θ _phase is defined by the following formula (2).

[ 2]

For example, the U-phase synthesized vector in the motor 50 is a synthesized vector obtained by synthesizing "t1_u-" and "t5_u+". If the phase of "t1_u+" is set to 0 degrees, the phase of "t1_u-" i.e., θ _U,1 is 180 degrees. The phase of "t5_u+" i.e., θ _U,2 is calculated as 144 ° × (5-1) =576 °. If θ _U,2 is converted to an angle ranging from 0 degrees to 360 degrees, θ _U,2 is 216 degrees. Since 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, the phase θ _U of the resultant vector of the U phase is calculated as (θ _U,1+θ_U,2)/2= (180 ° +216 °)/2=198 °.

The U-phase distributed winding coefficient k _d, that is, k _d,U is calculated by substituting values for the variables of the formula (1) according to the following formula (3). N _U,1 is the number of turns of coil 13 constituting coil 13 of the U phase, "t1_U-". N _U,2 is the number of turns of coil 13 constituting coil 13 of U phase, i.e. "t5_u+".

K_d,U＝{N_U,1×cos(180°－198°)+N_U,2×cos(216°－198°)}

/(N_U,1+N_U,2)···(3)

The distributed winding coefficient k _d of the V phase, i.e., k _d,V, and the distributed winding coefficient k _d of the W phase, i.e., k _d,W, can be obtained by the same calculation as in the case of k _d,U. K _d,UVW, which is the sum of the distributed winding coefficients k _d of all the U-, V-and W-phases, is calculated by the following equation (4).

K_d,UVW＝(k_d,U+k_d,V+k_d,W)/3· · · (4)

Fig. 8 is a diagram for explaining an increase in the distributed winding coefficient in the motor 50 according to embodiment 1. Fig. 8 shows a histogram showing values of distributed winding coefficients of the motor 51 according to the comparative example and a histogram showing values of distributed winding coefficients of the motor 50 according to embodiment 1. The value of the distributed winding coefficient is normalized 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 of the value of the distributed winding coefficient with respect to the motor 51.

In embodiment 1 shown in fig. 6, the number of U-phase coils 13 is 2, the number of V-phase coils 13 is 2, and the number of W-phase coils 13 is 2. In the comparative example shown in fig. 7, the number of U-phase coils 13 is 2, the number of V-phase coils 13 is 3, and the number of W-phase coils 13 is 2. In embodiment 1, the number of coils 13 is 1 less than in the case of the comparative example, and therefore, the same amplitude as in the case of the comparative example can be obtained by the fewer number of turns than in the case of the comparative example. Thus, in embodiment 1, the distributed winding coefficient can be increased as compared with the case of the comparative example.

The motor 50 employs the coil arrangement shown in fig. 2 and the number of turns shown in fig. 3, whereby an effect that the distributed winding coefficient can be increased is obtained as compared with the case of the comparative example having the coil arrangement shown in fig. 4 and the number of turns shown in fig. 5.

The motor 50 does not have a structure in which the 1 st tooth is disposed between the 2 nd tooth and the 2 nd tooth. The motor 50 can improve the distributed winding coefficient as compared with the case of the comparative example, and therefore can reduce the heat generation of the coil 13 in the movable element 1.

By setting the total number of turns of each tooth 12 in the above manner, the motor 50 can reduce the difference between the induced voltage and the inductance of each phase. This can reduce the difference in terminal voltages of the motor 50 in the motor 50. Further, the motor 50 can reduce the difference in total number of turns of each phase, and thus can reduce the difference in resistance value. This allows the motor 50 to reduce the local heat generation of the coil 13.

Fig. 9 is a diagram for explaining reduction of mutual inductance by the motor 50 according to embodiment 1. Fig. 9 shows a bar chart showing the value of the mutual inductance of the motor 51 according to the comparative example and a bar chart showing the value of the mutual inductance of the motor 50 according to embodiment 1. 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 represented by a ratio of the value of the mutual inductance with respect to the motor 51. The motor 50 employs the coil arrangement shown in fig. 2 and the number of turns shown in fig. 3, whereby an effect capable of reducing mutual inductance is obtained as compared with the case of the comparative example having the coil arrangement shown in fig. 4 and the number of turns shown in fig. 5.

The motor 50 is not limited to the case where the number of turns of the coil 13 attached to each tooth 12 is set as shown in fig. 3. The number of turns of the teeth 12 of the coil 13 of the 2-phase is not extremely larger than that of the other teeth 12, and the combination of the numbers of turns of the respective teeth 12 may be different from that shown in fig. 3. The motor 50 also has the same effect as the case where the number of turns of each coil 13 is set as shown in fig. 3, in the case where the combination of the number of turns of each tooth 12 is different from that shown in fig. 3.

The order of arrangement of the coils 13 in the teeth 12 in which the coils 13 of the plurality of phases are mounted is arbitrary. The order of the +v phase coil 13 and the-W phase coil 13 in the tooth 12 of t3 shown in fig. 2 may be reversed from that shown in fig. 2. The arrangement of the coils 13 in the plurality of teeth 12 is not limited as long as the order of phases in the traveling direction of the movable element 1 is the same as that shown in fig. 2. The phase at the end of the traveling direction may be any phase if the order of the phases is the same as that shown in fig. 2.

In embodiment 1, the movable element 1 is configured to satisfy n=5 and c=1. That is, the movable element 1 is configured such that 1 aggregate portion 10 composed of 5 teeth 12 is arranged in the traveling direction. In the motor 50, a plurality of the collecting portions 10 may be arranged in the traveling direction. That is, the movable element 1 may have a structure having a plurality of collecting portions 10. In this case, C is a natural number greater than 1. The motor 50 can obtain the above-described effects in the same manner as in the case where C is 1 even when C is a natural number greater than 1.

In embodiment 1, the movable element 1 is configured such that a single or a plurality of the collective portions 10 are arranged in the traveling direction. On the other hand, auxiliary teeth, which are teeth 12 having no coil 13, may be attached to both ends of the movable element 1 in the traveling direction. The motor 50 can obtain the same effect as in the case where no auxiliary teeth are attached even in the case where auxiliary teeth are attached to both ends of the moving element 1 in the traveling direction.

Each of the plurality of teeth 12 is not limited to the case where the tip portion on the excitation side is straight. A protrusion or a recess toward the traveling direction may be formed at the front end portion of the excitation side of the tooth 12. Even when the teeth 12 are formed with projections or depressions, the motor 50 can obtain the same effect as in the case where the teeth 12 are straight.

In embodiment 1, the description has been given of the structure in which the plurality of permanent magnets 21 are attached to the mount 22 on the surface of the stator core, but the motor 50 may be a structure in which the plurality of permanent magnets 21 are embedded in the stator core. Even when the plurality of permanent magnets 21 are embedded in the stator core, the motor 50 can obtain the same effect as in the case where the plurality of permanent magnets 21 are provided on the surface of the stator core.

According to embodiment 1, the motor 50 is configured such that the number of the N/C teeth 12 of the assembly 10 is C in the traveling direction, and the number of the 2 nd teeth in the assembly 10 is 1. The motor 50 can increase the distributed winding coefficient, and thereby can reduce heat generation of the coil 13 in the movable element 1. As described above, the motor 50 has an effect of reducing heat generation of the coil 13.

Embodiment 2.

Fig. 10 is a cross-sectional view of a motor 52 according to embodiment 2. In embodiment 2, the arrangement of the teeth 12 and the coil 13 in the movable element 1 is different from that in embodiment 1. In embodiment 2, the same reference numerals are given to the same constituent elements as those in embodiment 1, and mainly different configurations from embodiment 1 will be described. The cross section of the stator 2 shown in fig. 10 is a cross section of a portion of the stator 2 facing the movable element 1, as in the case of fig. 2.

In embodiment 2, the number of magnetic poles is 3, n=4, and c=1. In embodiment 2, N/C is 4, and is an integer other than a multiple of 3. N is an integer other than a multiple of 3. The motor 52 satisfies this condition, and thus has an effect of reducing the cogging torque.

In embodiment 2, each tooth 12 of the movable element 1 is assigned a tooth number for convenience. In fig. 10, each tooth 12 is assigned a tooth number t1, t2, t3, and t4 from left to right.

A 3-phase coil 13 is mounted on the 4 teeth 12. A coil 13 of +u phase is mounted on the tooth 12 of t 1. The teeth 12 at t2 are fitted with a +v phase coil 13 and a-U phase coil 13. The tooth 12 at t3 is fitted with a coil 13 of-V phase and a coil 13 of +w phase. The tooth 12 at t4 is fitted with a coil 13 of phase-W.

Each tooth 12 of t1 and t4 is a tooth 12 to which only a coil 13 of 1 phase is attached. the teeth 12 of t2 and t3 are teeth 12 on which the coil 13 of 2 phases is mounted. As described above, the plurality of teeth 12 of the movable element 1 include the 1 st tooth which is the tooth 12 to which only the 1-phase coil 13 is attached, and the 2 nd tooth which is the tooth 12 to which the plurality of phase coils 13 are attached. Each tooth 12 of t1 and t4 is the 1 st tooth. teeth 12 of t2 and t3 are the 2 nd teeth. The teeth 12 at the end in the traveling direction among the movable element 1, that is, the teeth 12 of t1 and the teeth 12 of t4 are the 1 st teeth, respectively.

In the motor 52, the collection portion 10 composed of N/C teeth 12 is arranged with C in the traveling direction. In embodiment 2, 1 aggregate 10 of 4 teeth 12 is arranged in the traveling direction. In embodiment 2, the number of 2 nd teeth included in the aggregation unit 10 is 2. In the collecting portion 10, 2 nd teeth are arranged continuously in the traveling direction. That is, no 1 st tooth is disposed between the 2 nd tooth and the 2 nd tooth.

Fig. 11 is a diagram showing an example of the number of turns of the coil 13 attached to each tooth 12 in embodiment 2. 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 are shown in fig. 11. The number of turns shown in fig. 11 is normalized based on the number of turns of the plurality of teeth 12 as a whole. The total number of turns shown in fig. 11 is normalized based on the number of turns of the entire plurality of teeth 12. That is, the ratio of the number of turns to the whole movable element 1 indicates the number of turns of each tooth 12 and the total number of turns. Fig. 11 shows a ratio of the number of series conductors for each phase to the number of series conductors in the whole movable element 1.

In the example shown in fig. 11, the sum of the total number of turns in the tooth 12 of t1, that is, 0.27, and the total number of turns in the tooth 12 of t4, that is, 0.27, is 0.54. the sum of the total number of turns in tooth 12 of t2, i.e., 0.23, and the total number of turns in tooth 12 of t3, i.e., 0.23, is 0.46. As described above, in embodiment 2, the total number of turns of the coils 13 in all the 1 st teeth included in the collecting portion 10 is larger than the total number of turns of the coils 13 in all the 2 nd teeth included in the collecting portion 10.

Here, the structure of the motor according to the comparative example of embodiment 2 will be described. Fig. 12 is a cross-sectional view of a motor 53 according to a comparative example of embodiment 2. Fig. 13 is a diagram showing an example of the number of turns of the coil 13 attached to each tooth 12 in the comparative example of embodiment 2. Like the motor 52 shown in fig. 10, the movable element 1 has 4 teeth 12. A coil 13 of +u phase is mounted on the tooth 12 of t 1. The teeth 12 at t2 are fitted with a +v phase coil 13 and a-U phase coil 13. A coil 13 of +w phase is mounted on the tooth 12 at t 3. The teeth 12 at t4 are fitted with a +v phase coil 13 and a-W phase coil 13.

In the motor 53, each tooth 12 of t1 and t3 is the 1 st tooth to which the coil 13 of 1 phase only is attached. the teeth 12 of t2 and t4 are respectively provided with coils 13 of 2 phases. the teeth 12 of t2 and t4 are the 2 nd teeth on which the plurality of coils 13 are mounted. In the motor 53, 1 st tooth is arranged between the 2 nd tooth and the 2 nd tooth.

In the comparative example shown in fig. 13, the sum of the total number of turns in the tooth 12 of t1, that is, 0.27, and the total number of turns in the tooth 12 of t3, that is, 0.06, is 0.33. the sum of the total number of turns in tooth 12 of t2, i.e., 0.34, and the total number of turns in tooth 12 of t4, i.e., 0.40, is 0.74. In the comparative example, unlike the case of embodiment 2 shown in fig. 13, the total number of turns of the coils 13 in all 1 st teeth included in the collecting portion 10 is smaller than the total number of turns of the coils 13 in all 2 nd teeth included in the collecting portion 10.

Fig. 14 is a vector diagram showing induced voltages in each coil 13 of the motor 52 according to embodiment 2. Fig. 15 is a vector diagram showing induced voltages in each coil 13 of the motor 53 according to the comparative example of embodiment 2. In fig. 14 and 15, the vector indicated by the solid arrow is the induced voltage vector. In each of the vector diagrams of fig. 14 and 15, the length 2 times the pitch of the permanent magnets 21 is set to 360 degrees in phase angle. The vector indicated by the broken-line arrow is an induced voltage vector of each phase, and is a synthesized vector obtained by synthesizing the induced voltage vectors of the coils 13 for each phase.

The phase difference between the teeth 12 adjacent to each other 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 teeth 12 of t1 and the teeth 12 of t2 is 360 ° × (3/2)/4=135°. The teeth 12 of the motor 50 are arranged such that the phase difference between the adjacent teeth 12 becomes 135 degrees. In embodiment 2, k _d,UVW, which is the sum of the distributed winding coefficients k _d of all the U phase, V phase, and W phase, is obtained by the same calculation as in the case of embodiment 1.

If fig. 14 and 15 are compared, the motor 52 according to embodiment 2 has a feature that the phase difference between the resultant vector of "t3_v" and V phase in fig. 14 is smaller than the phase difference between the resultant vector of "t4v+" and V phase in fig. 15.

Fig. 16 is a diagram for explaining an increase in the distributed winding coefficient in the motor 52 according to embodiment 2. Fig. 16 shows a histogram showing values of distributed winding coefficients of the motor 53 according to the comparative example and a histogram showing values of distributed winding coefficients of the motor 52 according to embodiment 2. The value of the distributed winding coefficient is normalized 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 of the value of the distributed winding coefficient to the motor 53.

The motor 52 employs the coil arrangement shown in fig. 10 and the number of turns shown in fig. 11, whereby an effect of being able to increase the distributed winding coefficient is obtained as compared with the case of the comparative example having the coil arrangement shown in fig. 12 and the number of turns shown in fig. 13.

The motor 52 does not have a structure in which the 1 st tooth is disposed between the 2 nd tooth and the 2 nd tooth. The motor 52 can improve the distributed winding coefficient as compared with the case of the comparative example, and therefore can reduce the heat generation of the coil 13 in the movable element 1.

By setting the total number of turns of each tooth 12 in the above manner, the motor 52 can reduce the difference between the induced voltage and the inductance of each phase. This reduces the difference in terminal voltage of the motor 52, which is obtained by the motor 52. Further, the motor 52 can reduce the difference in total number of turns of each phase, and thus can reduce the difference in resistance value. This reduces the effect of the electric motor 52 of reducing the local heat generation of the coil 13.

In embodiment 2, the movable element 1 is configured to satisfy n=4 and c=1. That is, the movable element 1 is configured such that 1 aggregate portion 10 composed of 4 teeth 12 is arranged in the traveling direction. In the motor 52, a plurality of the collecting portions 10 may be arranged in the traveling direction. That is, the movable element 1 may have a structure having a plurality of collecting portions 10. In this case, C is a natural number greater than 1. The motor 52 can obtain the above-described effects in the same manner as in the case where C is 1 even when C is a natural number greater than 1.

In embodiment 2, the movable element 1 is configured such that a single or a plurality of the collective portions 10 are arranged in the traveling direction. On the other hand, auxiliary teeth may be attached to both ends of the movable element 1 in the traveling direction. The motor 52 can obtain the same effect as in the case where no auxiliary teeth are attached even in the case where auxiliary teeth are attached to both ends of the moving element 1 in the traveling direction. In addition, as in the case of embodiment 1, a protrusion or a depression may be formed on the tip portion of the excitation side of the tooth 12 toward the traveling direction. As in the case of embodiment 1, the motor 52 may have a structure in which a plurality of permanent magnets 21 are embedded in the stator core.

According to embodiment 2, the motor 52 is configured such that C pieces of the aggregate portion 10 composed of N/C pieces of teeth 12 are arranged in the traveling direction, and 2 nd teeth are arranged in succession in the traveling direction in the aggregate portion 10. The motor 52 can increase the distributed winding coefficient, and thereby can reduce heat generation of the coil 13 in the movable element 1. As described above, the motor 52 has an effect of reducing heat generation of the coil 13.

Embodiment 3.

Fig. 17 is a cross-sectional view of the motor 54 according to embodiment 3. In embodiment 3, the arrangement of the teeth 12 and the coil 13 in the movable element 1 is different from that in embodiment 1 or 2. In embodiment 3, the same reference numerals are given to the same constituent elements as those in embodiment 1 or 2, and mainly the different configurations from embodiment 1 or 2 will be described. The cross section of the stator 2 shown in fig. 17 is a cross section of a portion of the stator 2 facing the movable element 1, as in the case of fig. 2.

In embodiment 3, the number of magnetic poles is 4, n=5, and c=1. In embodiment 3, N/C is 5, and is an integer other than a multiple of 3. N is an integer other than a multiple of 3. The motor 54 satisfies this condition, and thus has an effect of reducing the cogging torque.

In embodiment 3, each tooth 12 of the movable element 1 is assigned a tooth number for convenience. In fig. 17, each tooth 12 is assigned a tooth number t2, t3, t4, t5, t1 from left to right.

A 3-phase coil 13 is mounted on 5 teeth 12. The teeth 12 at t2 are fitted with coils 13 of-V phase. The teeth 12 at t3 are fitted with a +v phase coil 13 and a-W phase coil 13. A coil 13 of +w phase is mounted on the tooth 12 at t 4. A coil 13 of +u phase is mounted on the tooth 12 at t 5. The teeth 12 at t1 are fitted with coils 13 of the-U phase.

Each tooth 12 of t2, t4, t5, t1 is a tooth 12 to which only the coil 13 of phase 1 is attached. the tooth 12 of t3 is the tooth 12 on which the coil 13 of 2 phases is mounted. As described above, the plurality of teeth 12 of the movable element 1 include the 1 st tooth which is the tooth 12 to which only the 1-phase coil 13 is attached, and the 2 nd tooth which is the tooth 12 to which the plurality of phase coils 13 are attached. Each tooth 12 of t2, t4, t5, t1 is the 1 st tooth. tooth 12 of t3 is tooth 2. The teeth 12 at the end in the traveling direction among the movable element 1, that is, the teeth 12 of t2 and the teeth 12 of t1 are the 1 st teeth, respectively.

In the motor 54, the collection portion 10 composed of N/C teeth 12 is arranged in the traveling direction by C. In embodiment 3, 1 aggregate 10 of 5 teeth 12 is arranged in the traveling direction. In embodiment 3, the number of teeth 2 included in the aggregation unit 10 is 1.

An insulator for insulation between phases is mounted on the 2 nd tooth. In the 2 nd tooth, the winding area is smaller by the amount occupied by the insulator than in the 1 st tooth. Further, a protection member for protecting the coil 13 is attached to the tooth 12 located at the end in the traveling direction among the movable elements 1. In the teeth 12 located at the end portions, the winding area is smaller by the amount occupied by the protection member than in the teeth 12 located at positions other than the end portions.

In the case where the 2 nd tooth is disposed at the end portion in the traveling direction among the movable element 1, the insulator and the protection member are mounted at the 2 nd tooth, whereby the winding area in the 2 nd tooth becomes significantly small. In this tooth 2, in order to enlarge the number of turns, a coil 13 formed of a wire having a small wire diameter is mounted. In this case, the wire diameter becomes small, and thereby the heat generation of the coil 13 becomes large.

In the motor 54, the tooth 12 located at the end in the traveling direction among the movable elements 1 is the 1 st tooth, thereby preventing the winding area from being locally reduced in the tooth 12 located at the end in the traveling direction among the plurality of teeth 12. The coil 13 formed of a wire having a large wire diameter can be disposed on the 1 st tooth located at the end in the traveling direction, and heat generation of the coil 13 can be reduced. As described above, the motor 54 has an effect that heat generation of the coil 13 can be reduced because the tooth 12 located at the end in the traveling direction among the movable element 1 is the 1 st tooth.

In embodiments 1 and 2, the motors 50 and 52 have the effect of reducing the heat generation of the coil 13 because the tooth 12 located at the end in the traveling direction of the movable element 1 is the 1 st tooth.

In embodiment 3, the movable element 1 is configured such that 1 aggregate portion 10 composed of 5 teeth 12 is arranged in the traveling direction. In the motor 54, the plurality of collecting units 10 may be arranged in the traveling direction. That is, the movable element 1 may have a structure having a plurality of collecting portions 10. In this case, C is a natural number greater than 1. The motor 54 can obtain the above-described effects similarly to the case where C is 1 even when C is a natural number greater than 1.

In embodiment 3, the movable element 1 is configured such that a single or a plurality of the collective portions 10 are arranged in the traveling direction. On the other hand, auxiliary teeth may be attached to both ends of the movable element 1 in the traveling direction. The motor 54 can obtain the same effect as in the case where no auxiliary teeth are attached even in the case where auxiliary teeth are attached to both ends of the moving element 1 in the traveling direction. In addition, as in the case of embodiment 1 or 2, a protrusion or a recess may be formed in the tip portion of the excitation side of the tooth 12 toward the traveling direction. As in the case of embodiment 1 or 2, the motor 54 may have a structure in which a plurality of permanent magnets 21 are embedded in the stator core.

Embodiment 4.

Fig. 18 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 element 1 is different from those in embodiments 1 to 3. In embodiment 4, the same reference numerals are given to the same constituent elements as those in embodiments 1 to 3, and the configuration different from those in embodiments 1 to 3 will be mainly described. The cross section of the stator 2 shown in fig. 18 is a cross section of a portion of the stator 2 facing the movable element 1, as in the case of fig. 2.

In embodiment 4, the number of magnetic poles is 3, n=4, and c=1. In embodiment 4, N/C is 4 and is an integer other than a multiple of 3. N is an integer other than a multiple of 3. The motor 54 satisfies this condition, and thus has an effect of reducing the cogging torque.

In embodiment 4, each tooth 12 of the movable element 1 is assigned a tooth number for convenience. In fig. 18, each tooth 12 is assigned a tooth number t1, t2, t3, and t4 from left to right.

A 3-phase coil 13 is mounted on the 4 teeth 12. A coil 13 of +u phase is mounted on the tooth 12 of t 1. A coil 13 of +v phase is mounted on the tooth 12 at t 2. The tooth 12 at t3 is fitted with a +w phase coil 13 and a-V phase coil 13. The tooth 12 at t4 is fitted with a coil 13 of phase-W.

Each tooth 12 of t1, t2, t4 is a tooth 12 to which only a coil 13 of 1 phase is attached. the tooth 12 of t3 is the tooth 12 on which the coil 13 of 2 phases is mounted. As described above, the plurality of teeth 12 of the movable element 1 include the 1 st tooth which is the tooth 12 to which only the 1-phase coil 13 is attached, and the 2 nd tooth which is the tooth 12 to which the plurality of phase coils 13 are attached. Each tooth 12 of t1, t2, t4 is the 1 st tooth. tooth 12 of t3 is tooth 2. The teeth 12 at the end in the traveling direction among the movable element 1, that is, the teeth 12 of t1 and the teeth 12 of t4 are the 1 st teeth, respectively. Since the teeth 12 located at the end in the traveling direction of the movable element 1 are the 1 st teeth, the motor 55 can reduce heat generation of the coil 13.

In the motor 55, the collection portion 10 composed of N/C teeth 12 is arranged in the traveling direction by C. In embodiment 4, 1 aggregate 10 of 4 teeth 12 is arranged in the traveling direction. In embodiment 4, the number of teeth 2 in the aggregation part 10 is 1.

Fig. 19 is a diagram showing an example of the number of turns of the coil 13 attached to each tooth 12 in embodiment 4. 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 are shown in fig. 19. The number of turns shown in fig. 19 is normalized based on the number of turns of the plurality of teeth 12 as a whole. The total number of turns shown in fig. 19 is normalized based on the number of turns of the entire plurality of teeth 12. That is, the number of turns of each tooth 12 and the total number of turns are represented by a ratio with respect to the number of turns in the whole movable element 1. Fig. 19 shows a ratio of the number of series conductors for each phase to the number of series conductors in the whole movable element 1.

As shown in fig. 19, the total number of turns in the tooth 12 at t3 is 0.23. teeth 12 of t2 and teeth 12 of t4 are each the 1 st tooth adjacent to the 2 nd tooth. tooth 12 of t1 is the 1 st tooth adjacent to the 2 nd tooth with 1 st tooth interposed therebetween. the total number of turns in tooth 12 of t1 is 0.32, which is greater than the total number of turns in each of teeth 12 of t2 and teeth 12 of t4 by 0.23. As described above, in the assembly portion 10 according to embodiment 4, the total number of turns of the coils 13 in the 1 st tooth adjacent to the 2 nd tooth with 1 st tooth interposed therebetween is larger than the total number of turns of the coils 13 in the 1 st tooth adjacent to the 2 nd tooth.

Fig. 20 is a diagram for explaining an increase in the distributed winding coefficient in the motor 55 according to embodiment 4. Here, the structure of the comparative example according to embodiment 4 is the structure of the motor 53 shown in fig. 12. Fig. 20 shows a histogram showing values of distributed winding coefficients of the motor 53 according to the comparative example and a histogram showing values of distributed winding coefficients of the motor 55 according to embodiment 4. The value of the distributed winding coefficient is normalized 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 of the value of the distributed winding coefficient to the motor 53.

The motor 55 employs the coil arrangement shown in fig. 18 and the number of turns shown in fig. 19, whereby an effect of being able to increase the distributed winding coefficient is obtained as compared with the case of the comparative example having the coil arrangement shown in fig. 12 and the number of turns shown in fig. 13.

The motor 55 does not have a structure in which the 1 st tooth is disposed between the 2 nd tooth and the 2 nd tooth. The motor 55 can improve the distributed winding coefficient as compared with the case of the comparative example, and therefore can reduce the heat generation of the coil 13 in the movable element 1.

The motor 55 can reduce the difference in induced voltage between the phases and the difference in inductance between the phases by setting the total number of turns of each tooth 12 as described above. 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, and thereby can reduce the heat generation of the coil 13. As described above, the motor 55 has an effect of reducing heat generation of the coil 13.

In embodiment 4, the movable element 1 is configured such that 1 aggregate portion 10 composed of 4 teeth 12 is arranged in the traveling direction. In the motor 55, a plurality of the collecting units 10 may be arranged in the traveling direction. That is, the movable element 1 may have a structure having a plurality of collecting portions 10. In this case, C is a natural number greater than 1. The motor 55 can obtain the above-described effects similarly to the case where C is 1 even when C is a natural number greater than 1.

In embodiment 4, the movable element 1 is configured such that a single or a plurality of the collective portions 10 are arranged in the traveling direction. On this basis, auxiliary teeth may be respectively installed at both ends in the traveling direction among the movable members 1. The motor 55 can obtain the same effect as in the case where no auxiliary teeth are attached even in the case where auxiliary teeth are attached to both ends of the moving element 1 in the traveling direction. In addition, as in the case of embodiments 1 to 3, a protrusion or a recess toward the traveling direction may be formed at the tip end portion of the excitation side of the tooth 12. As in the case of embodiments 1 to 3, the motor 55 may have a structure in which a plurality of permanent magnets 21 are embedded in the stator core.

Embodiment 5.

Fig. 21 is a cross-sectional view of the motor 56 according to embodiment 5. In embodiment 5, the arrangement of each coil 13 in the tooth 12 of the 2 nd tooth t3 is different from the case of the motor 50 shown in fig. 2. The structure of the motor 56 is the same as that of the motor 50 except that the arrangement of the coils 13 in the teeth 12 of t3 is different from that of the motor 50. In embodiment 5, the same reference numerals are given to the same components as those in embodiments 1 to 4, and mainly the different configurations from those in embodiments 1 to 4 will be described. The cross section of the stator 2 shown in fig. 21 is a cross section of a portion of the stator 2 facing the movable element 1, as in the case of fig. 2.

Each tooth 12 extends from the core print 11 towards the stator 2. The direction from the core holder 11 toward the stator 2 is defined as the longitudinal direction of the teeth 12. In the tooth 12 of t3 shown in fig. 2, the coil 13 of +v phase and the coil 13 of-W phase are adjacent to each other in the length direction of the tooth 12. On the other hand, in the tooth 12 of t3 shown in fig. 21, the coil 13 of +v phase is wound on the tooth 12 side, that is, on the inner side. The coil 13 of the W phase is wound outside the coil 13 of the +v phase. That is, in the tooth 12 of t3, in addition to the coil 13 of +v phase, the coil 13 of-W phase is also mounted. In addition, in the tooth 12 of t3, a coil 13 of +v phase may be mounted in addition to the coil 13 of-W phase.

As described in embodiment 5, by disposing each coil 13 of the 2 nd tooth, the position at which the winding of the coil 13 starts and the position at which the winding of the coil 13 ends can be aligned to the position at which the coil is brought into contact with the core holder 11. That is, with respect to all the coils 13 included in the movable element 1, the position at which the winding of the coil 13 starts and the position at which the winding of the coil 13 ends can be aligned with the core print 11 side. In this case, the distance from the winding end position of the coil 13 to the neutral point or the distance from the winding start position of the coil 13 to the terminal can be minimized, and the resistance of the coil 13 can be reduced. This allows the motor 56 to reduce the heat generation of the coil 13.

As described in embodiment 5, by disposing each coil 13 of the 2 nd tooth, the magnetic flux passing through the coil 13 can be kept the same. Therefore, the motor 56 can reduce the difference in inductance between the phases, and the difference in terminal voltage of the motor 56 can be reduced.

In embodiment 5, the movable element 1 is configured such that 1 aggregate portion 10 composed of 5 teeth 12 is arranged in the traveling direction. In the motor 56, the plurality of collecting units 10 may be arranged in the traveling direction. That is, the movable element 1 may have a structure having a plurality of collecting portions 10. In this case, C is a natural number greater than 1. The motor 56 can obtain the above-described effects similarly to the case where C is 1 even when C is a natural number greater than 1.

In embodiment 5, the movable element 1 is configured such that a single or a plurality of the collective portions 10 are arranged in the traveling direction. On this basis, auxiliary teeth may be respectively installed at both ends in the traveling direction among the movable members 1. The motor 56 can obtain the same effect as in the case where no auxiliary teeth are attached even in the case where auxiliary teeth are attached to both ends of the moving element 1 in the traveling direction. In addition, as in the case of embodiments 1 to 4, a protrusion or a recess may be formed in the tip portion of the tooth 12 on the excitation side in the traveling direction. As in the case of embodiments 1 to 4, the motor 56 may be configured such that a plurality of permanent magnets 21 are embedded in the stator core.

The structures of the motors 50, 52, 54, 55, 56 according to embodiments 1 to 5 can also be applied to a rotating electrical machine. The rotary electric machine is an electric motor having a stator and a rotor, and rotating the rotor. Even when the structure of the motors 50, 52, 54, 55, 56 is applied to a rotating electrical machine, the same effects as those of the motors 50, 52, 54, 55, 56 can be obtained.

The configuration shown in the above embodiments shows an example of the content of the present invention. The structure of each embodiment can be combined with other known techniques. The structures of the respective embodiments may be appropriately combined with each other. A part of the structure of each embodiment may be omitted or changed without departing from the scope of the present invention.

Description of the reference numerals

The motor system comprises a movable piece 1, a stator 2, a collecting part 10, a core seat 11, a 12-tooth coil 13, a coil 21 permanent magnet 22, a mounting seat 50, 51, 52, 53, 54, 55 and 56 motor, a guiding part 60, a 70 sliding block and a 100 motor system.

Claims

1. An electric motor, comprising:

Exciting; and

An armature disposed so as to face the excitation, the armature being movable relative to the excitation,

The armature has: a core seat; a plurality of teeth extending from the core base in the direction of excitation, respectively, and aligned in the direction of travel of the armature relative to the excitation; and a plurality of coils mounted to a plurality of the teeth,

The plurality of teeth includes teeth of the coil having only 1 phase installed, i.e., 1 st tooth, and teeth of the coil having a plurality of phases installed, i.e., 2 nd tooth,

The plurality of coils are respectively arranged so as not to cross the grooves formed between the teeth adjacent to each other,

The number of teeth of the armature is N, the greatest common divisor between N, which is the number of teeth, and the number of excited magnetic poles in a range opposite to the N teeth is C, the aggregate portion composed of N/C teeth is configured with C in the traveling direction,

In the collecting portion, 2 nd teeth are arranged continuously in the traveling direction, or 1 nd tooth included in the collecting portion.

2. The motor of claim 1, wherein the motor is configured to control the motor to drive the motor,

The tooth located at the end of the travel direction among the armatures is the 1 st tooth.

3. An electric motor according to claim 1 or 2, characterized in that,

N/C is 4, and the number of 2 nd teeth included in the aggregation part is 1,

The total number of turns of the coils in the 1 st tooth adjacent to the 2 nd tooth with 1 st tooth interposed therebetween is larger than the total number of turns of the coils in the 1 st tooth adjacent to the 2 nd tooth.

4. An electric motor according to claim 1 or 2, characterized in that,

N/C is 4, and the number of the 2 nd teeth included in the collecting part is 2,

The total number of turns of the coils in all the 1 st teeth included in the aggregation part is larger than the total number of turns of the coils in all the 2 nd teeth included in the aggregation part.

5. An electric motor according to claim 1 or 2, characterized in that,

N/C is 5, and the number of 2 nd teeth included in the aggregation part is 1,

The total number of turns of the coil in the 1 st tooth adjacent to the 2 nd tooth is larger than the total number of turns of the coil in the 2 nd tooth, and the total number of turns of the coil in the 1 st tooth adjacent to the 2 nd tooth across 1 st tooth is smaller than the total number of turns of the coil in the 1 st tooth adjacent to the 2 nd tooth.