JP2008172926A - Armature and brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor having specifications further adapted to the demand. <P>SOLUTION: A stator of the brushless motor 105 comprises: a core having a plurality of teeth extending in the radial direction and arranged in the circumferential direction; and three-phase segment windings Ua, Va and Wa which are constituted to electrically connect a plurality of segment conductors 109 to one another at each slot projections 108 in the circumferential direction for each phase having a slot insertion part 107 arranged in the slot and the slot projection 108 which axially protrudes from the slot so as to axially penetrate the slots (slot number (1) to (45)) between the teeth. The segment windings Ua, Va and Wa are wound on the slots in a wave form, the slot insertion part 107 different in phase is mixed into a part of the slots, and thereby the number of the slots is set to be 45 which is 1.5 times the result of a phase number (3) × a magnetic field pole number (10). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an armature and a brushless motor.

Conventionally, rotating electric machines such as DC motors and brushless motors have armatures. And as an armature as a stator of a brushless motor, a core having teeth that extend in the radial direction and provided in the circumferential direction and a plurality of segment conductors that penetrate the slots between the teeth in the axial direction are arranged in the circumferential direction. Some have a multi-phase segment winding configured to be electrically connected (see, for example, Patent Document 1).
Japanese Patent No. 3405280

  However, in the armature as described above, the number of slots is set to an integer multiple of the number of phases × the number of field poles. In other words, the armature as described above has a configuration in which segment conductors of the same phase are arranged in one slot, and therefore the number of slots needs to be an integral multiple of the number of phases (for example, 3). Therefore, variations in physique and characteristics are limited to the condition of “the number of phases × an integral multiple of the number of field poles”, and a rotating electrical machine having specifications (physique and characteristics) suitable for demand cannot be provided.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an armature and a brushless motor having specifications more suitable for demand.

  In the invention according to claim 1, a core having a plurality of teeth extending in the radial direction and provided in the circumferential direction, and a slot insertion portion disposed in the slots so as to penetrate the slots between the teeth in the axial direction; A multi-phase segment winding constituted by a plurality of segment conductors being electrically connected in the circumferential direction between the slot protrusions for each phase having a slot protrusion protruding in the axial direction from the slot. The armature is provided, wherein the segment windings are disposed in the slots by wave winding, and the slot insertion portions of different phases are mixed in some of the slots, thereby reducing the number of the slots. The number of phases was set to 1.5 times, 2.5 times, or 3.5 times the number of field poles.

  According to this configuration, the segment windings are arranged by wave windings, and slot insertion portions of different phases are mixed in some slots, so that the number of slots is 1. × number of phases × number of field poles. Since it is set to 5 times, 2.5 times, or 3.5 times, it is possible to increase the number of variations of the armature and consequently the rotating electrical machine. In other words, for the number of slots multiplied by an integer multiple of the number of phases multiplied by the number of field poles (prior art), it is possible to obtain specifications that are intermediate between their physiques and characteristics, and more suitable specifications for demand. It is possible to provide an armature, and thus a rotating electric machine. Also, the cogging torque can be reduced by increasing the number of slots.

  In the invention according to claim 2, in the armature according to claim 1, the segment winding has a value obtained by multiplying the number of phases by 1.5 times, 2.5 times, or 3.5 times. A plurality of wave winding portions wound in the slots at alternate slot pitches of values rounded down to the next decimal place and values raised.

  According to this configuration, the segment winding has alternating values obtained by rounding down the value after rounding up the value obtained by multiplying the number of phases by 1.5 times, 2.5 times, or 3.5 times. Since it has a plurality of wave winding portions wound in the slot at the slot pitch, an armature in which the segment windings are arranged with a good balance in the circumferential direction as much as possible can be obtained. Therefore, for example, an increase in torque ripple can be suppressed as much as possible, and an armature having excellent characteristics and, in turn, a rotating electric machine can be provided while obtaining the effect of the invention according to claim 1.

  According to a third aspect of the present invention, in the armature according to the second aspect, an even number of the slot insertion portions are arranged in the radial direction in one slot, and the slot insertion portion The corrugated portion is configured to be electrically connected to the slot insertion portions arranged at different radial positions in the slots having different directions, and at least one of the slot protrusions in the segment winding is 2 A connecting wire that connects the wave winding portions of the two systems and reverses the direction of the wave winding is configured, and the connecting wire electrically connects the slot insertion portions arranged at the same radial position.

According to this configuration, the configuration described in claims 1 and 2 can be easily realized.
According to a fourth aspect of the present invention, in the armature according to the third aspect, the wave winding portions of a plurality of systems are connected in series in one for each phase, and in one slot The two slot insertion portions are arranged side by side in the radial direction, and the wave winding portion is arranged on the radially outer side of the slot that is different in the circumferential direction from the slot insertion portion arranged on the radial inner side. A slot insertion portion is configured to be electrically connected, and the crossover wire electrically connects the slot insertion portions disposed on the radially outer side.

  According to this configuration, the effect of the invention according to claim 3 can be obtained in the case where a plurality of wave winding portions are connected in series in one for each phase. In addition, according to the same configuration, when the generated torque is the same as compared to the case where the plurality of wave winding portions are connected in parallel in two or more for each phase, the physique is increased, but the number of segment conductors is reduced. The number of manufacturing steps can be reduced.

  According to a fifth aspect of the present invention, in the armature according to the third aspect, the plurality of wave winding portions are connected in parallel in two for each phase, and in one slot The four slot insertion portions are arranged side by side in the radial direction, and the wave winding portion is the second from the radially inner side of the slot that is different in the circumferential direction from the slot insertion portion arranged at the radially innermost side. The slot insertion portion arranged is electrically connected and the slot insertion portion arranged third from the radial inner side is arranged on the outermost radial direction of the slot different in the circumferential direction. The slot insertion portion is configured to be electrically connected, and the connecting wire electrically connects the slot insertion portions arranged second from the radially inner side, The above-mentioned arranged on the radially outermost side Lot insertion portions consisting of electrically connects.

  According to this configuration, the effect of the invention according to claim 3 can be obtained in a case where a plurality of wave winding portions are connected in parallel for each phase. In addition, according to the same configuration, when the generated torque is the same as compared to a configuration in which the plurality of wave winding portions are connected in parallel to three or more for each phase, the physique is increased, but the number of segment conductors is reduced. The number of manufacturing steps can be reduced. In addition, if the generated torque is the same as that without parallel connection, the physique can be reduced.

  The invention according to claim 6 is a brushless motor including the armature according to any one of claims 1 to 5 as a stator and a rotor set to the number of field poles. .

  According to this configuration, variations of the brushless motor can be increased. In other words, for a product whose number of slots is an integer multiple of the number of phases multiplied by the number of field poles, it is possible to obtain specifications that are intermediate between their physiques and characteristics, and to provide brushless motors with specifications more suitable for demand. It becomes possible to do.

According to a seventh aspect of the present invention, in the brushless motor according to the sixth aspect, the rotor is connected to a speed reducer, and drives the driven portion via the speed reducer.
According to this configuration, when a reduction gear whose torque is several times to several tens of times is provided, the selectivity (variation) of the brushless motor using the segment conductor, which is a small and small noise, is poor. Can be increased. In addition, if a reduction gear is provided, cogging torque and torque ripple are amplified by the gear ratio, and it is difficult to employ in applications where quietness is particularly desired to avoid noise deterioration due to torque fluctuations. To provide a brushless motor with a speed reducer that has a large number of slots and that can adopt a brushless motor with a larger number of slots while matching the required characteristics. Is possible.

  ADVANTAGE OF THE INVENTION According to this invention, the armature of a specification more suitable with respect to a demand, and a brushless motor can be provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the motor case 102 of the brushless motor 101 includes a yoke 103 formed in a bottomed cylindrical shape, and an end plate 104 that closes the opening of the yoke 103. A stator 105 as an armature is fixed to the inner peripheral surface of the yoke 103. As shown in FIG. 2, the stator 105 includes a core 106 having a cylindrical portion 106 a and a plurality of teeth 106 b that extend radially inward from the cylindrical portion 106 a and are provided in the circumferential direction. Further, as shown in FIG. 3, the stator 105 includes multi-phase (three-phase in this embodiment) segment windings Ua, Va, Wa. The segment windings Ua, Va, and Wa are provided with a slot insertion portion 107 and a slot S arranged in the slot S so as to penetrate the slot S (slot numbers “1” to “45”) between the teeth 106b in the axial direction. A plurality of segment conductors 109 are electrically connected in the circumferential direction between the slot protrusions 108 for each phase having a slot protrusion 108 protruding in the axial direction from the slot. 3 is a schematic diagram in which the stator 105 is developed in a planar shape and further divided into upper and lower parts in the drawing. In FIG. 3, the slot number “1”, which is a number in which the slots S are consecutive in the circumferential direction, is shown. ”To“ 45 ”. A rotor 110 is disposed inside the stator 105 as shown in FIG. The rotor 110 has a rotation shaft 111, and the rotation shaft 111 is rotatably supported by bearings 112 and 113 provided on the bottom of the yoke 103 and the end plate 104. A rotor core 114 is externally fitted on the rotating shaft 111 of the rotor 110, and a plurality of permanent cores are arranged on the outer periphery of the rotor core 114 so as to face the stator 105, specifically the radially inner end of the teeth 106b. Magnets 115 are provided at equiangular intervals. In this embodiment, ten permanent magnets 115 are provided, and the number of field magnetic poles of the rotor 110 is set to ten. Further, the brushless motor 101 of the present embodiment is used in an electric power steering apparatus, and a rotating shaft 111 of the rotor 110 is connected to a speed reducer (not shown), and is driven via the speed reducer. It is connected to a steering shaft (not shown) as a part to drive the steering shaft.

  Here, as shown in FIG. 2 and FIG. 3, the number of slots S (slot numbers “1” to “45”) is the number of phases (3 in this embodiment, U phase, V phase, W phase) × It is set to 45, which is 1.5 times the number of field poles (10 in this embodiment). This is because the segment windings Ua, Va, Wa are arranged in the slots S (slot numbers “1” to “45”) by wave winding, and slots of different phases in some slots S described later. This is made possible by inserting the insertion portion 107.

  Specifically, each segment winding Ua, Va, Wa has a value (4) obtained by rounding down the decimal point of the value obtained by multiplying the number of phases (3) by 1.5 (3 × 1.5 = 4.5). And a plurality of (in the present embodiment, first to third) wave winding portions Ua1-Ua3, Va1-Va3, Wa1- It has Wa3. The wave winding portions Ua1 to Ua3, Va1 to Va3, Wa1 to Wa3 are wound so as to pass through the slot S the same number of times as the number of field poles (10), that is, 10 times in this embodiment.

  Specifically, the first system wave winding portion Ua1 in the U-phase segment winding Ua has slot numbers “1”, “41”, “37”, “32”, “28”, “23”, Waves are wound around the slot S in the order of “19”, “14”, “10”, “5”. Further, the second system wave winding portion Ua2 in the U-phase segment winding Ua is continuous from the slot number “5” of the first system wave winding portion Ua1 and has the same wave winding direction. Numbers “2”, “42”, “38”, “33”, “29”, “24”, “20”, “15”, “11”, “6” are wound in the slot S in this order. Yes. Further, the third-system wave winding portion Ua3 in the U-phase segment winding Ua is continuous from the slot number “6” of the second-system wave winding portion Ua2, and the wave winding direction is reversed. Numbers “10”, “15”, “19”, “24”, “28”, “33”, “37”, “42”, “1”, “6” are wound in the slot S in this order. Yes. The wave winding portions Ua1 to Ua3 of these first to third systems are connected in series in this order, and their terminal portions are connected to the neutral point N.

  Further, the wave winding portion Va1 of the first system in the V-phase segment winding Va has slot numbers “7”, “2”, “43”, “38”, “34”, “29”, “25”. , “20”, “16”, and “11” are wound around the slot S. The second-system wave winding portion Va2 in the V-phase segment winding Va is continuous from the slot number “11” of the first-system wave winding portion Va1 and has the same wave winding direction. Numbers “8”, “3”, “44”, “39”, “35”, “30”, “26”, “21”, “17”, “12” are wound in the slot S in this order. Yes. Further, the third-system wave winding portion Va3 in the V-phase segment winding Va is continuous from the slot number “12” of the second-system wave winding portion Va2, and the wave winding direction is reversed. Numbers “16”, “21”, “25”, “30”, “34”, “39”, “43”, “3”, “7”, “12” are wound in the slot S in this order. Yes. The wave winding portions Va1 to Va3 of these first to third systems are connected in series in this order, and the terminal portion thereof is connected to the neutral point N.

  Further, the first system wave winding portion Wa1 in the W-phase segment winding Wa has slot numbers “13”, “8”, “4”, “44”, “40”, “35”, “31”. , “26”, “22”, “17” are wound around the slot S in this order. Further, the second-system wave winding portion Wa2 in the W-phase segment winding Wa is continuous from the slot number “17” of the first-system wave winding portion Wa1 and has the same wave winding direction. Numbers “14”, “9”, “5”, “45”, “41”, “36”, “32”, “27”, “23”, “18” are wound in the slot S in this order. Yes. Further, the third-system wave winding portion Wa3 in the W-phase segment winding Wa is continuous from the slot number “18” of the second-system wave winding portion Wa2 and the wave winding direction is reversed. Numbers “22”, “27”, “31”, “36”, “40”, “45”, “4”, “9”, “13”, “18” are wound in the slot S in this order. Yes. The wave winding portions Wa1 to Wa3 of these first to third systems are connected in series in this order, and their terminal portions are connected to the neutral point N.

  Further, in the present embodiment, as described above, the slot numbers “2”, “5”, “8”, “11”, “ 14, “17”, “20”, “23”, “26”, “29”, “32”, “35”, “38”, “41”, “44”. Is mixed.

  As a result, while the segment windings Ua, Va, Wa of each phase are evenly provided, the number of slots S (slot numbers “1” to “45”) is set to the number of phases (3) × the number of field poles (10). It is set to 45, which is 1.5 times.

Further, as described above, the two slot insertion portions 107 arranged in one slot S (slot numbers “1” to “45”) are arranged side by side in the radial direction as shown in FIG. .
Each of the wave winding portions Ua1 to Ua3, Va1 to Va3, Wa1 to Wa3 includes a slot insertion portion 107 disposed on the radially inner side and a slot insertion portion 107 disposed on the radially outer side of the slot S having a different circumferential direction. Are electrically connected by the slot protrusion 108. In FIG. 3, the slot insertion portion 107 disposed on the radially inner side is illustrated by a two-dot chain line, and the slot insertion portion 107 disposed on the radially outer side is illustrated by a solid line.

  Also, one of the slot protrusions 108 in each segment winding Ua, Va, Wa connects two (second and third) systems of wave windings Ua2, Ua3, Va2, Va3, Wa2, Wa3. At the same time, a connecting wire 108a for reversing the direction of the wave winding is formed, and the connecting wire 108a electrically connects the slot insertion portions 107 arranged on the radially outer side.

  The segment conductors 109 other than those disposed at the end portions of the wave winding portions Ua1 to Ua3, Va1 to Va3, Wa1 to Wa3 have the same shape and are formed by bending a conductor plate. The segment conductor 109 is formed in a substantially U shape, and includes a pair of slot insertion portions 107 (having a slot pitch of 4) corresponding to the parallel straight portions of the U shape, and a connecting lower end of the U shape. A slot projecting portion 108 as a connecting portion that integrally connects one end (the upper end in FIG. 3) of the slot insertion portion 107, and an opening upper end portion of the U-shape. A slot projecting portion 108 that extends outward in the circumferential direction from the other end (lower end in FIG. 3) of 107 and serves as an end portion of the segment conductor 109. The segment conductors 109 are end portions (in FIG. 3, the lower end) of the slot projecting portions 108 are connected to each other by welding or the like to form a connection portion 108b, and the wave winding portions Ua1 to Ua3, Va1 to Va3. , Wa1 to Wa3. Of course, the segment conductor 109 arranged at each end of the wave winding portions Ua1 to Ua3, Va1 to Va3, Wa1 to Wa3 is set to have another shape for constituting the above-described circuit.

Next, characteristic effects of the above embodiment will be described below.
(1) The segment windings Ua, Va, Wa are arranged by wave winding, and the slot insertion portions 107 of different phases are mixed in some slots S, so that the number of slots S is reduced by the number of phases × field. Since the number of magnetic poles is set to 1.5 times, the number of variations of the stator 105, and hence the brushless motor 101, can be increased. That is, for the number of slots S that is an integral multiple of the number of phases × the number of field poles, which is 1 or 2 times (conventional technology), it is possible to obtain specifications intermediate between their physiques and characteristics, It becomes possible to provide the stator 105 and the brushless motor 101 having specifications more suitable for demand. Specifically, in the brushless motor 101 of the present embodiment, the copper loss increases and the rotation speed decreases when the torque is the same as in the case where the number of slots S is the same as the number of phases × the number of field poles. However, the physique can be reduced to about 2/3. Also, the cogging torque can be reduced by increasing the number of slots S. Conversely, in the brushless motor 101 of the present embodiment, the physique increases to about 4/3 when the torque is the same as the number of slots S is twice the number of phases × the number of field poles. However, copper loss can be reduced and the rotational speed can be increased. Therefore, it is possible to provide a brushless motor having a specification more suitable for demand in combination with the number of slots S that is an integral multiple of the number of phases multiplied by the number of field poles (conventional technology).

  (2) Each segment winding Ua, Va, Wa has a value obtained by multiplying the number of phases (3) by 1.5 (3 × 1.5 = 4.5) and rounded down (4) And a plurality of (in the present embodiment, first to third) wave winding portions Ua1-Ua3, Va1-Va3, Wa1- It has Wa3. In this way, it is possible to obtain the stator 105 in which the segment windings Ua, Va, Wa are arranged with a good balance in the circumferential direction as much as possible. Therefore, for example, an increase in torque ripple can be suppressed as much as possible, and the stator 105 with good characteristics, and thus the brushless motor 101 can be provided.

  (3) A plurality of (in the present embodiment, first to third) wave winding portions Ua1 to Ua3, Va1 to Va3, Wa1 to Wa3 are connected in series to one for each phase. In one slot S, two slot insertion portions 107 are arranged side by side in the radial direction. The wave winding portions Ua1 to Ua3, Va1 to Va3, and Wa1 to Wa3 include a slot insertion portion 107 disposed on the radially inner side and a slot insertion portion 107 disposed on the radially outer side of the slots S having different circumferential directions. It is configured to be electrically connected. The connecting wire 108a that connects the wave winding portions Ua2, Ua3, Va2, Va3, Wa2, Wa3 of the two (second and third) systems and reverses the direction of the wave winding is disposed on the radially outer side. The slot insertion portions 107 are electrically connected to each other. If it does in this way, the stator 105 of the structure which has the said effect (1), (2) can be actualized easily. In addition, according to the same configuration, when the generated torque is the same as compared to a structure in which two or more wave winding portions Ua1 to Ua3, Va1 to Va3, and Wa1 to Wa3 are connected in parallel for each phase, However, the number of segment conductors 109 can be reduced, and consequently the number of manufacturing steps can be reduced.

The above embodiment may be modified as follows.
In the above embodiment, the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets 115) is 10, and the number of slots S is the number of phases ( 3) × 1.5 times the number of field poles (10), but may be implemented by changing the number of phases and the number of field poles, or the number of slots S may be the number of phases × number of field poles. It may be implemented by changing to 2.5 times or 3.5 times. In the above embodiment, the wave winding portions Ua1 to Ua3, Va1 to Va3, and Wa1 to Wa3 of the first to third systems are connected in series for each phase. It is good also as what a winding part connects in parallel with two for every phase. Specific examples thereof are listed below.

  FIG. 4 shows that the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets) is 8, and the number of slots S is the number of phases (3) × field. The first another is set to 60 (slot numbers “1” to “60”), which is 2.5 times the number of magnetic poles (8), and the plurality of wave winding portions are connected in series to one for each phase. It is a schematic diagram of the stator 131 in the brushless motor of an example.

  In this example, each segment winding Ua, Va, Wa has a value obtained by rounding off the decimal point of the value (3 × 2.5 = 7.5) obtained by multiplying the number of phases (3) by 2.5 (7 ) And the raised value (8), and the plurality of (in this example, first to fifth) wave winding portions Ua1 to Ua5, Va1 to Va5, and Wa1 to Wa5 wound around the slot S. Have The wave winding portions Ua1 to Ua5, Va1 to Va5, Wa1 to Wa5 are wound so as to pass through the slot S the same number of times as the number of field poles (8), that is, 8 times in this example.

  Specifically, the first system wave winding portion Ua1 in the U-phase segment winding Ua has slot numbers “1”, “54”, “46”, “39”, “31”, “24”, Waves are wound around the slot S in the order of “16” and “9”. The second-system wave winding portion Ua2 in the U-phase segment winding Ua is continuous from the slot number “9” of the first-system wave winding portion Ua1 and has the same wave winding direction. Waves are wound around the slot S in the order of numbers “2”, “55”, “47”, “40”, “32”, “25”, “17”, “10”. Further, the third-system wave winding portion Ua3 in the U-phase segment winding Ua is continuous from the slot number “10” of the second-system wave winding portion Ua2 and has the same wave winding direction. Waves are wound around the slot S in the order of numbers “3”, “56”, “48”, “41”, “33”, “26”, “18”, “11”. Furthermore, the wave winding portion Ua4 of the fourth system in the U-phase segment winding Ua is continuous from the slot number “11” of the wave winding portion Ua3 of the third system and the wave winding direction is reversed. Waves are wound around the slots S in the order of numbers “17”, “24”, “32”, “39”, “47”, “54”, “2”, “9”. Further, the fifth-system wave winding portion Ua5 in the U-phase segment winding Ua is continuous from the slot number “9” of the fourth-system wave winding portion Ua4 and has the same wave winding direction. Waves are wound around the slots S in the order of numbers “18”, “25”, “33”, “40”, “48”, “55”, “3”, “10”. Note that the wave winding portions Ua1 to Ua5 of these first to fifth systems are connected in series in this order, and the terminal portion thereof is connected to the neutral point N.

Further, the first to fifth wave winding portions Va1 to Va5 in the V-phase segment winding Va are wound in a pattern similar to that of the U-phase from the slot number “11”.
In addition, the first to fifth wave winding portions Wa1 to Wa5 in the W-phase segment winding Wa are wound in a pattern similar to that of the U-phase from the slot number “21”.

  Further, in this example, the slot numbers “1”, “6”, “11”, “16”, “21”, “26”, “ Slot insertion portions 107 of different phases are mixed in “31”, “36”, “41”, “46”, “51”, “56”.

  As a result, while the segment windings Ua, Va, Wa of the phases are evenly provided, the number of slots S (slot numbers “1” to “60”) is set to the number of phases (3) × the number of field poles (8). It is set to 60, which is 2.5 times.

  Each of the wave winding portions Ua1 to Ua5, Va1 to Va5, Wa1 to Wa5 includes a slot insertion portion 107 disposed on the radially inner side and a slot insertion portion 107 disposed on the radially outer side of the slot S having a different circumferential direction. Are electrically connected at the slot protrusion 108. In FIG. 4, the slot insertion portion 107 disposed on the radially inner side is illustrated by a two-dot chain line, and the slot insertion portion 107 disposed on the radially outer side is illustrated by a solid line. In this example, the length of the slot protrusion 108 is different from that in the above embodiment, and the shape of the segment conductor 109 is slightly different accordingly. However, the same reference numerals as those in the above embodiment are used. It is attached.

  Also in this example, one of the slot protrusions 108 in each segment winding Ua, Va, Wa is one of the two (third and fourth) systems of wave windings Ua3, Ua4, Va3, Va4, Wa3. , Wa4, and a connecting wire 108a for inverting the direction of wave winding. The connecting wire 108a electrically connects the slot insertion portions 107 arranged on the outer side in the radial direction.

  In this way, an intermediate specification between those physiques and characteristics can be obtained with respect to the slot S number that is an integral multiple of the number of phases × the number of field poles and doubled or tripled (prior art). Therefore, it is possible to provide the stator 131 and the brushless motor having specifications more suitable for demand.

  FIG. 5 shows that the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets) is 10, and the number of slots S is the number of phases (3) × field. The second number is set to 45 (slot numbers “1” to “45”), which is 1.5 times the number of magnetic poles (10), and the plurality of wave winding portions are connected in parallel in two for each phase. It is a schematic diagram of the stator 141 in the brushless motor of an example.

  In this example, the segment windings Ua, Va, Wa are the same as those in addition to the wave winding portions Ua1-Ua3, Va1-Va3, Wa1-Wa3 of the first to third systems of the above embodiment. It has wave winding portions Ua4 to Ua6, Va4 to Va6, Wa4 to Wa6 of the fourth to sixth systems connected in parallel (with respect to the neutral point N) in a pattern.

Further, as described above, the four slot insertion portions 107 arranged in one slot S (slot numbers “1” to “45”) are arranged side by side in the radial direction.
Further, in this example, the wave winding portions Ua1 to Ua3, Va1 to Va3, Wa1 to Wa3 are arranged second from the radially inner side of the slot insertion portion 107 arranged on the radially innermost side and the slot S different in the circumferential direction. The slot insertion portion 107 thus formed is electrically connected by a slot protruding portion 108. The wave winding portions Ua4 to Ua6, Va4 to Va6, and Wa4 to Wa6 are slot insertions arranged on the outermost side in the radial direction of the slots S different in the circumferential direction from the slot insertion unit 107 arranged third from the inner side in the radial direction. The unit 107 is configured to be electrically connected. In FIG. 5, the slot insertion portion 107 arranged on the radially innermost side is indicated by a two-dot chain line, and the slot insertion portion 107 arranged second from the radial inner side is indicated by a broken line, from the radially inner side. The third slot insertion portion 107 is shown by a solid line, and the slot insertion portion 107 arranged at the outermost radial direction is shown by a one-dot chain line.

  In this example, two of the slot protrusions 108 in each segment winding Ua, Va, Wa are two (second and third, fifth and sixth) systems of wave windings Ua2, Ua3. , Ua5, Ua6, Va2, Va3, Va5, Va6, Wa2, Wa3, Wa5, Wa6, and a connecting wire 108a for inverting the direction of wave winding. The connecting wires 108a electrically connect the slot insertion portions 107 arranged second from the inside in the radial direction and the slot insertion portions 107 arranged on the outermost side in the radial direction. It consists of what to connect.

  In this way, in the case where the wave winding portions of a plurality of systems are connected in parallel in two for each phase, the number of slots S is an integral multiple of the number of phases × the number of field poles, which is 1 or 2 times. Therefore, it is possible to obtain specifications that are intermediate between those physiques and characteristics, and to provide a stator 141 and a brushless motor with specifications that are more suitable for demand. In addition, according to the same configuration, if the generated torque is the same as that in which the wave winding portions Ua1 to Ua6, Va1 to Va6, Wa1 to Wa6 of a plurality of systems are connected in parallel to three or more for each phase, However, the number of segment conductors 109 can be reduced, and consequently the number of manufacturing steps can be reduced. In addition, if the generated torque is the same as that without parallel connection, the physique can be reduced.

  FIG. 6 shows that the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets) is 12, and the number of slots S is the number of phases (3) × field. The third number is set to 54 (slot numbers “1” to “54”), which is 1.5 times the number of magnetic poles (12), and a plurality of wave winding portions are connected in parallel in two for each phase. It is a schematic diagram of the stator 151 in the brushless motor of an example. Also in this example, the stator 151 is configured by the same law as the above-described law.

  FIG. 7 shows that the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets) is 8, and the number of slots S is the number of phases (3) × field. The number of magnetic poles is set to 36 (slot numbers “1” to “36”) which is 1.5 times the number of magnetic poles (8), and a plurality of wave winding portions of a plurality of systems are connected in series to one for each phase. It is a schematic diagram of the stator 161 in the brushless motor of an example. Also in this example, the stator 161 is configured by the same law as the above-described law.

  In FIG. 8, the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets) is 12, and the number of slots S is the number of phases (3) × field. The number of magnetic poles is set to 54 (slot numbers “1” to “54”) which is 1.5 times the number of magnetic poles (12), and a plurality of wave winding portions are connected in series to one for each phase. It is a schematic diagram of the stator 171 in the brushless motor of an example. Also in this example, the stator 171 is configured by the same law as the above-described law.

  FIG. 9 shows that the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets) is 6, and the number of slots S is the number of phases (3) × field. The number of magnetic poles is set to 45 (slot number “1” to “45”), which is 2.5 times the number of magnetic poles (6), and a plurality of wave winding portions of a plurality of systems are connected in parallel in two for each phase. It is a schematic diagram of the stator 181 in the brushless motor of an example. Also in this example, the stator 181 is configured by the same law as the above-described law.

  FIG. 10 shows that the number of phases is 3 (U phase, V phase, W phase), the number of field poles (number of permanent magnets) is 8, and the number of slots S is the number of phases (3) × field. Seventh another in which the number of magnetic poles (8) is set to 60 (slot number “1” to “60”), which is 2.5 times, and the plurality of wave winding portions are connected in parallel in two for each phase. It is a schematic diagram of the stator 191 in the brushless motor of an example. Also in this example, the stator 151 is configured by the same law as the above-described law.

  In the above embodiment, the segment conductor 109 has a pair of slot insertion portions 107 and a slot protrusion 108 that integrally connects one end (the upper end in FIG. 3) of the slot insertion portions 107 to each other. However, the present invention is not limited to this, and the segment conductor may be changed to another configuration. For example, the segment conductor 109 of the above embodiment is divided into two segments, that is, a segment conductor having a shape in which the slot protrusion 108 that connects one end (the upper end in FIG. 3) of the pair of slot insertion portions 107 is separated. It is good. In this case, the number of segment conductors is doubled, and the segment conductors need to be connected to each other by welding or the like at the slot protruding portions on one end side and the other end side of the slot insertion portion.

  In the above embodiment, the brushless motor 101 and the stator 105 thereof are embodied. However, an armature having substantially the same configuration as that of the stator 105 may be embodied as a rotor of a DC motor. In this case, the number of field poles is the number of field poles in the stator.

Sectional drawing of the brushless motor in this Embodiment. The partial cross section top view of the stator in this Embodiment. The schematic diagram which expand | deployed the stator in this Embodiment on the plane. The schematic diagram which expand | deployed the stator in another example on the plane. The schematic diagram which expand | deployed the stator in another example on the plane. The schematic diagram which expand | deployed the stator in another example on the plane. The schematic diagram which expand | deployed the stator in another example on the plane. The schematic diagram which expand | deployed the stator in another example on the plane. The schematic diagram which expand | deployed the stator in another example on the plane. The schematic diagram which expand | deployed the stator in another example on the plane.

Explanation of symbols

  105, 131, 141, 151, 161, 171, 181, 191 ... Stator, 106 ... Core, 106b ... Teeth, 107 ... Slot insertion part, 108 ... Slot protrusion, 108a ... Crossover, 109 ... Segment conductor, 110 ... rotor, S ... slot ("1" to "60" ... slot number of slot), Ua, Va, Wa ... segment winding, Ua1 to Ua6, Va1 to Va6, Wa1 to Wa6 ... wave winding part.

Claims (7)

A core having teeth extending in the radial direction and provided in the circumferential direction;
A plurality of segment conductors protrude into the slot for each phase having a slot insertion portion disposed in the slot so as to penetrate the slot between the teeth in the axial direction and a slot protrusion protruding in the axial direction from the slot. An armature including a multi-phase segment winding configured to be electrically connected in a circumferential direction between parts,
The segment windings are disposed in the slots by wave winding, and the slot insertion portions of different phases are mixed in some of the slots, so that the number of slots is 1 times the number of phases × the number of field poles. . Armature set to 5 times, 2.5 times, or 3.5 times. The armature according to claim 1,
The segment winding has the slot pitch alternating with the value obtained by rounding down the decimal point of the value obtained by multiplying the number of phases by 1.5 times, 2.5 times, or 3.5 times and the value raised. An armature having a plurality of wave winding portions wound around. The armature according to claim 2, wherein
Within the one slot, an even number of the slot insertion portions are arranged side by side in the radial direction,
The slot insertion portion is electrically connected to the slot insertion portion arranged at different radial positions in the slots having different circumferential directions to constitute the wave winding portion,
At least one of the slot protrusions in the segment winding constitutes a connecting wire that connects the corrugated portions of two systems and reverses the direction of the corrugated winding, and the connecting wire is at the same radial position. An armature, wherein the slot insertion portions arranged are electrically connected to each other. The armature according to claim 3,
The wave winding portions of a plurality of systems are serially connected to one for each phase,
In one of the slots, the two slot insertion portions are arranged side by side in the radial direction,
The wave winding portion is configured by electrically connecting the slot insertion portion disposed radially inward and the slot insertion portion disposed radially outside the circumferentially different slot,
The said crossover wire electrically connects the said slot insertion parts arrange | positioned on the radial direction outer side. The armature according to claim 3,
The wave winding sections of a plurality of systems are connected in parallel to two for each phase,
In one of the slots, the four slot insertion portions are arranged side by side in the radial direction,
The wave winding portion is configured by electrically connecting the slot insertion portion arranged at the radially innermost side and the slot insertion portion arranged second from the radial inner side of the slot having a different circumferential direction. And the slot insertion portion arranged third from the inner side in the radial direction and the slot insertion portion arranged at the outermost radial direction of the slots having different circumferential directions are configured to be electrically connected And consist of
The connecting wire electrically connects the slot insertion portions arranged second from the inside in the radial direction, and electrically connects the slot insertion portions arranged on the outermost side in the radial direction. An armature characterized by comprising:   A brushless motor comprising the armature according to claim 1 as a stator and a rotor set to the number of field poles. The brushless motor according to claim 6,
The rotor is connected to a speed reducer, and drives a driven part through the speed reducer.

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