JP7057477B1 - Manufacture method of stator, M-phase AC motor equipped with it, and stator - Google Patents

Abstract

From the stator core, MN slots (M and N are positive integers respectively) arranged in the circumferential direction of the stator core, and the winding through which the alternating current of any one of the M phases flows. The stator of an M-phase AC motor including a plurality of coils, and one of X slots adjacent to each other in the circumferential direction, where X is a positive integer that is mutually elementary with respect to the value obtained by MN. As a group of basic slots, a group of basic slots in which a winding is arranged in any one of the X slots in the group of basic slots and a winding is arranged in any of the X slots. It is repeatedly arranged in the circumferential direction with a cycle of slot pitch X.

Description

The present invention relates to a stator, an M-phase AC motor including the stator, and a method for manufacturing the stator.

The characteristics of an AC motor vary greatly depending on the relationship between the number of poles and the number of slots and the arrangement of windings in the slots. For example, if the number of poles is large, the stator is less likely to be magnetically saturated, so that there is an advantage that the stator can be miniaturized, but there is a disadvantage that the maximum speed (control frequency) of the AC motor cannot be increased. Further, when the number of slots is large, there is an advantage that the counter electromotive voltage waveform becomes a clean sine wave, but there is a disadvantage that the number of coils increases. Further, the value obtained by dividing the number of slots by the number of poles is close to the coil pitch, but the smaller the value, the smaller the coil end, and as a result, the coil length becomes shorter, so that the copper loss decreases. On the other hand, since the amount of magnetic flux concentrated in one pole increases, iron loss increases. Further, in the rotor of an AC motor, it is possible to increase the torque density of the AC motor by increasing the amount of magnetic flux by increasing the amount of magnets used per pole, but on the other hand, it is possible to increase the torque density of the rotor. There is a demerit that the cogging torque and torque ripple increase due to the increase in the amount of magnetic flux. When designing and manufacturing an AC motor, the number of poles, the number of slots, and the winding arrangement are appropriately selected according to the characteristics, applications, usage environment, cost, etc. required for the AC motor, taking these advantages and disadvantages into consideration. Will be done. Further, it is desired that the characteristics of the AC motor and the method of manufacturing the AC motor, in which the trade-off relationship between these contradictory merits and demerits is eliminated and more merits can be obtained, are desired.

For example, a mover in which P magnetic poles are arranged at approximately equal intervals and a fixed position in which the winding centers of N winding coils excited by the m phase are arranged at approximately equal intervals in the moving direction. The combination of the number of magnetic poles P of the mover and the number of winding coils N of the stator is P = 2n (hereinafter, n is a natural number) and N = 2n ± 1 or N = 2 (n ± 1). In a permanent magnet type motor in which P and N are selected so that N is not an integral multiple of the number of phases m, the number of turns of the winding coil is set to be different between the winding coils, and the winding is described. A permanent magnet type motor characterized in that only one phase of a winding coil is wound around one winding center of a wire coil is known (see, for example, Patent Document 1).

For example, a stator having a plurality of pairs of magnetic poles and a stator having a plurality of slots formed in the rotation axis direction of the rotor and arranged in the circumferential direction and radially opposed to the rotor. In a three-phase AC motor equipped with a plurality of windings inserted into the slot and wound around the stator, the number of rotor poles is 2P and the number of slots into which the stator windings are inserted. Let N be, and the value obtained by dividing the number of slots N by the number of pole pairs P is the irreducible fraction, and the value of the denominator of the irreducible fraction is odd. In, any of the three phases of U phase, V phase and W phase, and the windings of a total of six phases of the opposite phase are arranged in three layers per slot, and are arranged in each slot 3. Of the windings of the layers, the windings of the first layer are arranged so that the arrangements of the U-phase, V-phase, and W-phase three-phase windings have rotational symmetry of ± 120 degrees with respect to each other at the mechanical angle. The winding of the second layer, which is one of the remaining two layers, is arranged so that the arrangement of the winding of the first layer is shifted from the arrangement of the winding of the first layer by the L slot. For the winding of the third layer, which is the remaining layer of the two layers, the arrangement of the winding of the first layer is the same as the arrangement of the winding of the first layer by the amount of the winding of the second layer. A three-phase AC motor characterized in that it is arranged so as to be offset in the direction opposite to the arrangement of the wires is known (see, for example, Patent Document 2).

For example, a rotor having a plurality of pairs of magnetic poles and a stator having a plurality of slots formed in the rotation axis direction of the rotor and arranged in the circumferential direction and radially opposed to the rotor. , A plurality of windings inserted into the slot and wound around the stator, the number of poles of the rotor is 2P, the number of slots into which the windings of the stator are inserted is 6N, and the number of slots is When the value obtained by dividing 6N by the number of poles P is the irreducible fraction, and the quotient of the number of slots 6N divided by the number of poles 2P in the stator of the 3-phase AC motor having the relationship of 2N> P is X. In the stator, coils wound with a predetermined number of turns are arranged in 2N slots per phase, and each coil is aligned with another coil connected in series in the direction of current. One side of each opposite side that shares one side and is stacked in one central slot and does not share the slots of the two coils is one in which the slots are separated by X from the central slot. The two coils are arranged in a figure eight-shaped connection over three slots, and the set of the eight-shaped connecting coils is arranged in one phase in the slot of the stator. A three-phase AC motor is known in which each of the N sets is arranged at a position where they do not completely overlap each other and are connected in series (see, for example, Patent Document 3).

For example, a stator having a cylindrical shape and having a plurality of slots formed in the circumferential direction on the inner peripheral surface, a stator having a plurality of phases of coils inserted into the plurality of slots, and the stator. A method for manufacturing a rotary electric machine having a stator core rotatably supported with respect to a stator core and a stator having at least a pair of stator poles provided on the stator core, wherein the plurality of stators are formed from a lead wire. The bundle coil forming step of forming the bundle coil in which the phase coils are divided into a plurality of parts for each of the phases, and the plurality of blades which are rod-shaped and are arranged on the circumference apart from each other, and each of the above. A plurality of each of the phases between the blades of a coil inserter provided with pushers arranged inside the blades so as to face the inner portion of the blades and move along the direction of formation of the blades. The stator core so that the position of each of the slots coincides with the position of the gap formed between the blades and the coil setting step of stacking and inserting the bundled coils in a layer in the forming direction of the blades. In the stator core setting step of setting the coil in the coil insertion machine, and by moving the pusher to the stator core side, a plurality of the bundled coils inserted between the blades on the pusher side. By pressing the bundle coil adjacent to the stator core side of the bundle coil, a plurality of the bundle coils of each of the phases are sequentially stacked in the slots at once and inserted in a layered manner. A method for manufacturing a rotary electric machine having a bundle coil batch insertion step is known (see, for example, Patent Document 4).

For example, an annular stator core having a plurality of slots in the circumferential direction, a slot accommodating portion arranged in the slots having different circumferential directions, and a turn portion connecting the slot accommodating portions outside the slot. In the stator of a rotary electric machine including a stator winding composed of a plurality of conductors having The second slot accommodating portion, the third slot accommodating portion, ..., The nth (n is a natural number of 4 or more) slot accommodating portion, and the outside of the slot and the stator on one end side in the axial direction of the stator core. The first turn portion, the second turn portion, ..., The first (n-1) slot accommodating portion that alternately connects the slot accommodating portions to the outside of the slot on the other end side in the axial direction of the core. And a (n-1) turn portion connecting the nth slot accommodating portion, and the radial distance from the first slot accommodating portion to the central axis of the stator core of the nth slot accommodating portion is sequentially obtained. The stator core diameter is larger or sequentially smaller than the surface of the slot accommodating portion at a portion of the lead wire on the slot accommodating portion or an extension of the slot accommodating portion. A stator of a rotary electric machine characterized by having a bulging portion that bulges in a direction is known (see, for example, Patent Document 5).

Japanese Unexamined Patent Publication No. 2011-223676 Japanese Unexamined Patent Publication No. 2016-140202 Japanese Unexamined Patent Publication No. 2017-011959 Japanese Unexamined Patent Publication No. 2018-08584 Japanese Unexamined Patent Publication No. 2011-142798

Akihiko Yukie, "Introduction to Algebra 1 Group Theory", Nihon Hyoronsha, February 15, 2019 Akihiko Yukie, "Algebra 2 Rings, Body, and Galois Theory," Nihon Hyoronsha, October 25, 2019.

There is a demand for technological development of a highly versatile AC motor that can handle various numbers of poles, number of slots, and winding arrangements.

According to one aspect of the present disclosure, any one of a stator core, MN (M and N are positive integers) slots arranged in the circumferential direction of the stator core, and M phase. The stator of an M-phase alternating current motor comprising a plurality of coils consisting of windings through which a phase alternating current flows is circumferential, where X is a positive integer that is mutually elementary with respect to the values obtained by MN. With X adjacent slots as one basic slot group, a winding is arranged in any of the X slots in the basic slot group, and the winding is wound in any of the X slots. The basic slot group in which is arranged is repeatedly arranged in the circumferential direction at a cycle of slot pitch X.

Further, according to one aspect of the present disclosure, the M-phase AC motor includes the stator and a rotor arranged radially opposite to the stator.

Further, according to one aspect of the present disclosure, a stator of an M-phase AC electric motor including a plurality of coils composed of windings through which an AC current of any one of the M-phases (M is a positive integer) flows is manufactured. The method consists of a stator core forming step of forming a stator core having MN (N is a positive integer) slots arranged in the circumferential direction, and a mutual element with respect to the value obtained by MN. When a positive integer is X, the basic slot group obtained by arranging the winding in any of the X slots adjacent to each other in the circumferential direction is repeatedly arranged in the circumferential direction in the cycle of the slot pitch X. It comprises a winding arrangement step.

Further, according to one aspect of the present disclosure, a stator of an M-phase AC electric motor including a plurality of coils composed of windings through which an AC current of any one of the M-phases (M is a positive integer) flows is manufactured. The method is obtained by a stator core forming step of forming a stator core having a cylindrical hollow and MN (N is a positive integer) slots arranged in the circumferential direction, and MN. When X is a positive integer that is mutually elementary with respect to a value, X in the basic blade group when X blades adjacent to each other in the circumferential direction are used as one basic blade group in the inserter winding device. Placed on the blade by inserting into the stator core a blade preparation step that places the winding on one of the blades and an inserter winding device that has the winding placed on the blades in the basic blade group. The winding is transferred to one of the X slots in the basic slot group when the X slots adjacent to each other in the circumferential direction are made into one basic slot group in the cycle of the slot pitch X. It comprises a winding placement step for placing the winding in a slot.

Further, according to one aspect of the present disclosure, the manufacture of a stator of an M-phase AC electric motor including a wave-wound coil composed of a winding through which an AC current of any one of the M-phases (M is a positive integer) flows. The method consists of a stator core forming step of forming a stator core having MN (N is a positive integer) slots arranged in the circumferential direction, and first and second sides substantially parallel to each other. A flat line generation step for generating a plurality of U-shaped flat lines having a third side connecting the first side and the second side, and a positive positive with respect to the values obtained by MN. When the integer of A part of the first side of one basic slot group and a part of the second side of the other basic slot group are formed between the adjacent basic slot groups and the flat wire accommodating step formed in the circumferential direction. It comprises a coil forming step of forming a wave-wound coil in which a winding is housed in a slot in each basic slot group by bending and joining to each other.

Further, according to one aspect of the present disclosure, a stator of an M-phase AC electric motor including a wave-wound coil composed of a winding through which an AC current of any one of the M-phases (M is a positive integer) flows is manufactured. The method is based on the fact that X is a positive integer that is mutually elementary with respect to the value obtained by M and N (N is a positive integer), and X slots adjacent to each other in the circumferential direction of the stator core are one basic. As a slot group, a first flat wire forming step for forming a flat wire having a wavy shape having a length corresponding to the basic slot group for one cycle of the wave winding, and a second for winding the flat wire in an annular shape. One of the flat wire by inserting a plurality of magnetic materials having a groove shape corresponding to the slot provided in the stator core from the radial outside of the flat wire forming step and the circularly wound flat wire. It comprises a coil forming step in which a winding composed of portions forms a wave winding coil housed in a slot.

According to one aspect of the present disclosure, it is possible to realize a highly versatile AC motor capable of supporting various numbers of poles, number of slots, and winding arrangements, a stator provided therein, and a method for manufacturing the stator. can.

It is a developed sectional view illustrating the coil arrangement in one basic slot group consisting of 7 slot pitches in the stator of a 36-slot three-phase AC motor according to the embodiment of the present disclosure. Expanded cross section illustrating the coil arrangement when the basic slot group consisting of the 7 slot pitch shown in FIG. 1 is arranged in the circumferential direction in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a figure. In the stator of a 36-slot three-phase AC motor according to the embodiment of the present disclosure, when 36 slots are virtually expanded to 252 and a group of basic slots consisting of a 7-slot pitch is virtually arranged for 36 pieces. It is a developed sectional view which illustrates the coil arrangement of. It is a developed sectional view illustrating the first allocation example of each phase coil in the case of the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure, in the case where the basic slot group has a 7-slot pitch. It is a developed sectional view illustrating the winding arrangement of the three-phase coil assigned by the first allocation example shown in FIG. 4 in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a developed sectional view illustrating the second allocation example of each phase coil in the case of the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure, in the case where the basic slot group has a 7-slot pitch. It is a developed sectional view illustrating the winding arrangement of the 3-phase coil assigned by the 2nd allocation example shown in FIG. 6 in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a developed sectional view which illustrates the 3rd allocation example in the case where the basic slot group is 7-slot pitch in the stator of the 36-slot three-phase AC motor according to the embodiment of this disclosure. It is a developed sectional view illustrating the coil arrangement allocated by the third allocation example shown in FIG. 8 over one circumference in the circumferential direction in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a developed sectional view illustrating the coil arrangement allocated by the third allocation example shown in FIG. 8 over 7 turns in the circumferential direction in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a developed sectional view illustrating the variation of the coil arrangement in one basic slot group when the basic slot group is set to 7 slot pitch in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a developed sectional view illustrating the first example of the coil arrangement in one basic slot group in the case where the basic slot group is a 13-slot pitch in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. .. It is a developed sectional view explaining the 1st embodiment of the manufacturing method of the stator of the M-phase AC motor by embodiment of this disclosure. It is a perspective view which shows the inserter winding apparatus used in the 2nd Embodiment of the manufacturing method of the stator of the M-phase AC motor by embodiment of this disclosure. It is a perspective view which shows the positional relationship between the inserter winding device and an annular coil in the 2nd embodiment of the method of manufacturing the stator of the M-phase AC motor according to the embodiment of this disclosure. It is a top view explaining the 2nd embodiment of the manufacturing method of the stator which has the annular coil of the M-phase AC motor by embodiment of this disclosure. It is a perspective view which shows the positional relationship between the inserter winding device and the wave winding coil corresponding to the 1st slot group in the 2nd embodiment of the method of manufacturing the stator of the M-phase AC motor according to the embodiment of this disclosure. It is a perspective view which shows the positional relationship between the inserter winding device and the wave winding coil corresponding to the 2nd slot group in the 2nd embodiment of the method of manufacturing the stator of the M-phase AC motor by the embodiment of this disclosure. FIG. 3 is a perspective view showing a positional relationship between an inserter winding device and a wave winding coil corresponding to the first to sixth slot groups in the second embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure. be. It is a top view which shows the wave winding coil which has finished arranging the 1st to 6th slot group in the 2nd form of the manufacturing method of the stator of the M phase AC motor by the embodiment of this disclosure. It is a developed sectional view explaining the 3rd mode of the manufacturing method of the stator of the M phase AC motor by embodiment of this disclosure. It is a perspective view explaining the 1st flat wire forming step in 4th Embodiment of the manufacturing method of the stator of the M phase AC motor by embodiment of this disclosure. It is a perspective view explaining the 2nd flat wire forming step in 4th Embodiment of the manufacturing method of the stator of the M phase AC motor by embodiment of this disclosure. FIG. 5 is a perspective view showing a state in which a flat wire formed into a wavy shape is wound in an annular shape in the fourth embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure. It is a perspective view (the 1) explaining the coil formation step in 4th Embodiment of the manufacturing method of the stator of the M phase AC motor by embodiment of this disclosure. FIG. 2 is a perspective view (No. 2) illustrating a coil forming step in the fourth embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure. It is sectional drawing which illustrates the positional relationship between the stator and the rotor of the M-phase AC motor according to the embodiment of this disclosure. It is a figure which illustrates the appearance of the M-phase AC motor provided with the stator according to the embodiment of this disclosure. It is a figure explaining the definition of a winding in an annular coil. It is a figure explaining the definition of a winding in a wave winding coil.

Hereinafter, a method for manufacturing a stator, an M-phase AC motor including the stator, and a stator will be described with reference to the drawings. In each drawing, similar members are designated by the same reference numerals. In addition, the scales of these drawings have been changed as appropriate for ease of understanding. Further, the embodiment shown in the drawings is an example for carrying out, and is not limited to the illustrated embodiment.

Further, in the present specification, "・" is an operator representing multiplication in the four arithmetic operations of numbers. The operator "・" representing multiplication may be represented by the operator "*". Further, for three positive integers M, N, and X, the fact that MN and X are relatively prime relations means that there is no common divisor between MN and X other than 1. .. At this time, there is also a disjoint relationship between M and X and between N and X, respectively. Further, the value of the least common multiple of MN and X has the property of being MN / X multiplied by three integers. These properties are utilized in the embodiments of the present disclosure.

First, the definitions of the coil and the winding in the embodiment of the present disclosure will be described.

FIG. 29 is a diagram illustrating a definition of winding in an annular coil. As shown in FIG. 29, a coil such as a copper wire through which an electric current flows is used to form a closed annular shape, and the coils connected in the same shape and overlapped in a bundle are referred to as an "annular coil". The annular coil 4 is composed of a winding 41 which is a portion accommodated in the slot 2 provided in the iron core (core) 3 of the stator and a coil end 42 which is a portion not accommodated in the slot 2. The wire drawn from one coil is referred to as a lead wire 43. In particular, the lead wire for connecting the coil to the coil is referred to as a crossover wire. The winding 41 may be composed of a single wire or a plurality of bundled wires. The number of winding wires in one annular coil is referred to as "number of turns".

FIG. 30 is a diagram illustrating a definition of winding of a wave winding coil. Wave winding is a method in which an annular coil extending over 360 degrees is bent into a wave shape and wound in a slot of a stator. As shown in FIG. 30, since the wave winding coil 4 is wound in the slot 2 while alternately forming the coil ends 42 at a specific slot pitch with respect to both end faces in the axial direction of the iron core 3 of the stator. It will be composed only of the winding 41, the coil end 42, and the lead wire 43. The wave winding coil 4 has an advantage that the coil end 42 can also be made smaller because the number of crossover wires between the coils is small and the number of required coils can be reduced. The number of turns of the wave winding coil is generally 1.

Here, the M-phase alternating current in the motor and the + (plus) winding and the- (minus) winding of the winding in the embodiment of the present disclosure will be described. In the embodiment of the present disclosure, the M-phase AC motor is a motor in which an AC current or an AC voltage having the same amplitude and different M types of phases is applied to the winding. Further, it is assumed that different phases of the M phase are electrically equilibrated with each other. The electrically balanced M-type phase refers to the M-type phase in which each phase is displaced by 360 / M degrees from each other.

Further, the winding of a coil through which a certain one-phase alternating current flows is divided into two windings in which the phases of the currents differ by 180 degrees according to the direction of the current flowing through the windings of the coil. For example, taking the annular coil shown in FIG. 29 as an example, the winding 41 in one annular coil is composed of two windings having different directions of flowing currents. When one winding 41P is defined as "+ winding", the other winding 41N is a "-winding" in which a current whose phase differs by 180 degrees at an electric angle flows. When clearly distinguishing between "+ winding" and "-winding" of the winding of each phase, in general M-phase alternating current, the winding of each phase is distinguished by twice the number, and "+ winding". The phase in which "-winding" is distinguished is called "phase band".

Taking an electric motor driven by a conventional three-phase alternating current power supply as an example, the three phases of three-phase alternating current are distinguished by the names U-phase, V-phase, and W-phase, and the magnitudes of the respective currents are the same. They are 120 degree out of phase and electrically balanced. The current flowing through the windings of the motor can divide the windings of the coils of each phase into + windings and-windings, so each can be distinguished as "-U", "+ U", "-V", It is divided into 6 phase bands of "+ V", "-W", and "+ W". These 6-phase band windings are "-U" (0 degrees), "+ V" (60 degrees), "-W" (120 degrees), and "+ U" (180 degrees) based on "-U". Degrees), "-V" (240 degrees), and "+ W" (300 degrees) in that order, the phases differ by 60 degrees depending on the electrical angle. By allocating these six phase bands to the windings placed in the stator slots of the motor and passing an electric current around each winding placed discretely according to Ampere's law of electromagnetics (right-handed screw law). A magnetic field is generated and periodic polarity can be generated in the stator core. Since it is sufficient for the winding of the motor to be electrically balanced, the positions of the U-phase, V-phase, and W-phase windings should be rotationally symmetric (three-fold rotationally symmetric) by 120 degrees at each mechanical angle. Although it is often arranged, the positions of the 6-phase bands of "+ U", "-V", "+ W", "-U", "+ V", and "-W" rotate by 60 degrees at each mechanical angle. It may be configured to be symmetric (six-fold rotational symmetry). Whether or not the winding arrangement can have six-fold rotational symmetry depends on the number of slots in the stator, the number of pole pairs of the rotor, or the number of windings stored in the slots (the number of layers in the slots). It is restricted by whether it can be arranged evenly. For example, the number of slots may not be a multiple of 6 as an example in which the rotation symmetry cannot be clearly made 6 times. If the number of slots is not a multiple of 6, it is physically impossible to arrange the 6-phase bands so that they are rotationally symmetric by 60 degrees at a mechanical angle.

Furthermore, as another example of M-phase alternating current, an electric motor driven by a 5-phase alternating current power supply will be described as an example. When distinguished into phases, each phase is electrically different in phase by 72 degrees in order of electrical angle. Furthermore, when distinguishing between + winding and-winding in the winding of each phase of the motor, "-A" (0 degree), "+ D" (36 degrees), and "-" are used as the reference. B "(72 degrees)," + E "(108 degrees)," -C "(144 degrees)," + A "(180 degrees)," -D "(216 degrees)," + B "(252 degrees)," A total of 10 phases of current, in which the electric angles differ by 36 degrees in the order of "-E" (288 degrees) and "+ C" (324 degrees), flows through the winding. By allocating this 10-phase band to the winding of the stator of the motor so that it is electrically balanced, the motor can be driven. Since the windings to which the A phase, B phase, C phase, D phase, and E phase are assigned need to be electrically balanced, the windings of each phase should have five-fold rotational symmetry with each other. Is placed in. That is, the windings are arranged so that the positions are rotationally symmetric by 72 degrees at the machine angle. It is sufficient that the wounds to be arranged have five-fold rotational symmetry, but "-A", "+ D", "-B", "+ E", "-C", "+ A", " The stator may be configured by distinguishing the 10-phase bands of "-D", "+ B", "-E", and "+ C" and arranging the windings so that they are in a rotationally symmetric relationship 10 times with each other. .. However, as a necessary condition, the number of slots needs to be a multiple of 10 (twice the number of phases 5).

Based on the same principle, it is possible to configure a motor powered by polyphase alternating current such as 9-phase alternating current and 12-phase alternating current.

In the embodiment described below, in order to simplify the explanation, a linearly developed cross-sectional view of a cylindrical stator will be used. The developed sectional view includes a view seen from the upper surface of the sectional view of the stator and a view seen from the side surface of the stator. A "slot identification number" is assigned to each slot provided in the stator.

Hereinafter, a stator according to the embodiment of the present disclosure, an M-phase AC motor provided with the stator (M is a positive integer), and a method for manufacturing the stator will be described. Here, as an example, an inner rotor type AC motor as an M-phase AC motor according to the embodiment of the present disclosure will be described. In the inner rotor type AC motor, a slot that opens on the inner peripheral side is formed in the stator core. The embodiment of the present disclosure is also applicable to an outer rotor type M-phase AC motor, in which case a slot opening on the outer peripheral side is formed in the stator core.

The stators of the M-phase AC motor (M is a positive integer) according to the embodiment of the present disclosure are the stator core and MN (N) which are each formed in a groove shape and arranged in the circumferential direction of the stator core. Is a positive integer) slot and a plurality of coils consisting of windings through which an alternating current of any of the M phases flows.

In the embodiment of the present disclosure, when X is a positive integer that is relatively prime to the value obtained by MN, the X slots adjacent to each other in the circumferential direction are regarded as one basic slot group, and the basic slot is the basic slot. A coil winding is placed in any of the X slots in the group. Since the value obtained by MN and the positive integer X have a relationship with each other, the greatest common divisor of the value obtained by MN and the positive integer X is 1. Further, a group of basic slots configured by arranging windings in any of the X slots is repeatedly arranged in the circumferential direction of the stator core. The coils in each basic slot group have the same shape, that is, the slot pitch (slot cycle) of the slots in which the windings are arranged (accommodated) is the same in each basic slot group. Further, the basic slot group configured by arranging the windings in any of the X slots is repeatedly arranged M and N in the circumferential direction of the stator core at a cycle of the slot pitch X. -The windings will be arranged in all N slots. According to one aspect of the present disclosure, various combinations of the number of poles, the number of slots, and the winding arrangement can be realized, but some specific examples are listed below.

First, as an example, in the stator of a 3 (= M) phase AC motor with 36 (= MN) slots, the coil arrangement when 7 (= X) slots are set as the basic slot group is shown in FIG. 1. This will be described with reference to FIG.

FIG. 1 is a developed sectional view illustrating a coil arrangement in one basic slot group consisting of a 7-slot pitch in a stator of a 36-slot three-phase AC motor according to the embodiment of the present disclosure. In FIG. 1, the upper row shows the stator 1 seen from the upper surface, and the lower row shows the stator 1 seen from the side surface, but the same may be described in subsequent drawings.

In the stator of a 36-slot three-phase AC motor, the number of phases M is 3, so N is 12. As positive integers X that are relatively prime to the value 36 obtained by 3 (= M) and 12 (= N), 1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31 , And 35, but here, as an example, 7 is selected as a positive integer X that is relatively prime for the value 36. In this case, 7 (= X) slots 2 adjacent to each other in the circumferential direction are defined as a "basic slot group". The winding arrangement of the coil in the basic slot group may be such that the winding 41 is arranged in any one of the slots 2 within the 7-slot pitch, but in FIG. 1, as an example, the slot 2 of the slot identification numbers 1 and 4 is arranged. The winding 41 is arranged (accommodated) in the winding coil 41 to form one annular coil. That is, the coil 4 is a coil which is a winding portion which is accommodated in the slot 2 of the slot identification numbers 1 and 4 and a portion which is not accommodated in the slot 2 in the basic slot group consisting of the slots 2 of the slot identification numbers 1 to 7. It is composed of an annular wire consisting of an end. In FIG. 1, the leader line and the crossover line to the other basic slot group adjacent to the basic slot group consisting of the slots of the slot identification numbers 1 to 7 are not shown.

FIG. 2 shows the coil arrangement when the basic slot group consisting of the 7-slot pitch shown in FIG. 1 is arranged over one circumference in the circumferential direction in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a developed sectional view to exemplify.

As shown in FIG. 2, in the stator core 3 in which 36 slots are arranged in the circumferential direction of the stator core 3, the basic slot group shown in FIG. 1 having a 7-slot pitch is provided over one circumference in the circumferential direction. Five can be repeatedly arranged in a cycle of slot pitch 7. The coils in each basic slot group have the same shape, that is, the slot pitch (slot cycle) of the slot 2 in which the windings are arranged (accommodated) is the same in each basic slot group. In FIG. 2, in the first basic slot group, the coil 4 formed in an annular shape is arranged in the slots 2 of the slot identification numbers 1 and 4, and in the second basic slot group, the slots 2 of the slot identification numbers 8 and 11 are arranged. The coil 4 formed in an annular shape is arranged, and in the third basic slot group, the coil 4 formed in an annular shape is arranged in the slots 2 of the slot identification numbers 15 and 18, and the slot identification is performed in the fourth basic slot group. In the fifth basic slot group, the coil 4 formed in an annular shape is arranged in the slots 2 of the slots 22 and 25, and the coil 4 formed in an annular shape is arranged in the slots 2 of the slot identification numbers 29 and 32. The coils between adjacent basic slot groups are connected by a crossover wire. Since the basic slot group has a slot pitch of 7 (= X), even if five basic slot groups having a 7-slot pitch are arranged in the stator core 3 of 36 (= MN) slots (that is, the stator core). (Even if the basic slot group is arranged in the circumferential direction in 3), the end of the fifth basic slot group is slot 2 of slot identification number 35, and does not reach slot 2 of slot identification number 36.

FIG. 3 shows, in the stator of a 36-slot 3-phase AC motor according to the embodiment of the present disclosure, 36 slots are virtually expanded to 252, and a basic slot group consisting of a 7-slot pitch is virtually 36 pieces. It is a developed sectional view which illustrates the coil arrangement at the time of arrangement.

As shown in FIG. 3, regarding the coil arrangement on the first circumference of the stator core 3 in the circumferential direction, as described with reference to FIG. 2, the first basic slot group to the fifth basic slot group are arranged. To.

In the sixth basic slot group following the fifth basic slot group, the coil 4 formed in an annular shape is arranged in the slots 2 of the slot identification numbers 36 and 39. After that, m is an integer of 6 or more, and in the m + 1st basic slot group, the coil 4 formed in an annular shape is arranged in the slots 2 of the slot identification numbers “m ・ 7 + 1” and “m ・ 7 + 4”, and m is set as m. By inductively repeating from 6 to 251 the 36 basic slot groups are evenly arranged in each of the virtual 252 slots.

Here, for virtual slot identification numbers numbered 1 to 252, a method of projecting each slot identification number onto 36 slot identification numbers will be described. Each slot identification number is divided by 36 of the number of slots to obtain the remainder, and the value of the remainder is reassigned to each slot as the slot identification number. If the remainder is 0, the slot identification number is 36. By these operations, the identification numbers of the 252 slots are all converted into the slot identification numbers of any one of 1 to 36. For example, for 1, 37, 73, 109, 145, 181 and 217, the remainder is 1 when divided by 36, so that the slot identification numbers 1, 37, 73, 109, 145, 181 and 217 are slot identification. Can be projected on number 1. Similarly, for 2, 38, 74, 110, 146, 182, and 218, the remainder is 2 when divided by 36, so slot identification numbers 2, 38, 74, 110, 146, 182, and 218 are slots. It can be projected on the identification number 2. After that, the same operation can be performed to project to any of the slot identification numbers 3, 4, ..., 35. For 36, 72, 108, 144, 180, 216, and 252, the remainder is 0 when divided by 36, but the slot identification number is 36 for these. From the above operation, the basic slot group is evenly arranged in each of the 36 slots of the stator.

Except for the winding start of the coil of the first basic slot group and the winding end of the coil of the 36th basic slot group, the coils between adjacent basic slot groups are connected by a crossover.

Since the 252 virtual slots are a total of 36.7 slots, a coil having the same shape as the coil in the basic slot group of FIG. 1 is considered to be arranged seven times in the circumferential direction of the stator. As shown in FIG. 3, the coil 4 is arranged over 7 (= X) circumferences in the circumferential direction of the stator core 3 by repeatedly arranging 36 (= MN) basic slots. Finally, the windings of the coil 4 will be arranged in all 36 slots. In this way, by repeatedly arranging 36 basic slot groups in the circumferential direction of the stator core 3, the coil is wound over 7 turns in the circumferential direction of the stator core 3 and wound around all 36 slots. Is arranged because the value "7", which has an elementary relationship with the number of slots 36, is selected as the slot pitch of the basic slot group. According to the embodiment of the present disclosure, a positive integer that is mutually elementary with respect to the number of slots M and N is a basic slot group having X as a slot pitch, and the coil is wound so as to have the same shape in each basic slot group. By repeatedly arranging such basic slot groups in the circumferential direction of the stator core at a cycle of slot pitch X, windings can be evenly arranged in all MN slots. can. It should be noted that the stator 1 of the 3 (= M) phase AC motor may be created in which the basic slot group is repeatedly arranged by a smaller number than 36 in the circumferential direction of the stator core 3.

As shown in FIG. 3, by appropriately allocating the coil 4 to the U-phase coil, the V-phase coil, and the W-phase coil, a stator of a 36-slot 3-phase AC motor is completed.

Here, some examples of allocation of each phase coil of the stator of the three-phase AC motor of 36 slots are listed. Hereinafter, a plurality of basic slot groups are continuously arranged in the circumferential direction, and each basic slot group is electrically connected by a coil end or a lead wire, and is referred to as a "slot group". A line to which any of the phase bands "-U", "+ U", "-V", "+ V", "-W", and "+ W" is assigned is referred to as a "coil group".

FIG. 4 is a developed sectional view illustrating a first allocation example of each phase coil in the case where the basic slot group has a 7-slot pitch in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure.

In the first allocation example shown in FIG. 4, the crossover line at the position where the 36 (= MN) basic slot group described with reference to FIG. 3 is equally divided into 3 (= M) is cut (in the figure). , Cut at the position of the broken line.).

That is, the crossing line between the twelfth basic slot group and the thirteenth basic slot group arranged on the third lap in the circumferential direction of the stator core 3 is cut, and five laps in the circumferential direction of the stator core 3 are cut. Cut the crossing line between the 24th basic slot group and the 25th basic slot group arranged in the eye. Then, starting from the lead wire of the winding of the slot 2 of the slot identification number 1 in the first basic slot group arranged on the first lap in the circumferential direction of the stator core 3, the third lap in the circumferential direction of the stator core 3 starts. The coil ending at the lead wire of the winding of slot 2 having slot identification number 9 in the twelfth basic slot group arranged in is called the first slot group and is assigned to the coil of the first phase (for example, U phase). Specifically, by assigning the -U phase to the winding of the slot of the slot identification number 1 of one coil of the first basic slot group, the other winding of the coil becomes the winding of the + U phase and is pulled out. The windings arranged in the other first slot group connected by the wire are sequentially determined to be -U phase or + U phase, whereby the phase band of each winding of the first slot group is uniquely determined. To. This is referred to as a first coil group. Further, starting from the lead wire of the winding of the slot 2 of the slot identification number 13 in the 13th basic slot group arranged on the third lap in the circumferential direction of the stator core 3, the fifth lap in the circumferential direction of the stator core 3 starts. The coil ending with the lead wire of the winding of the slot 2 of the slot identification number 21 in the 24th basic slot group arranged in the second slot group is defined as the second slot group and is assigned to the coil of the second phase (for example, V phase). The second slot group to which the V phase is assigned is referred to as the second coil group. Further, starting from the lead wire of the winding of the slot 2 of the slot identification number 25 in the 25th basic slot group arranged on the 5th lap in the circumferential direction of the stator core 3, the 7th lap in the circumferential direction of the stator core 3 starts. The coil ending with the lead wire of the winding of the slot 2 of the slot identification number 36 in the 36th basic slot group arranged in the third slot group is defined as the third slot group and is assigned to the coil of the third phase (for example, W phase). The third slot group to which the W phase is assigned is referred to as the third coil group. By the above operation, three coil groups are formed by allocating a phase band to the lead wire at one end of the slot group for the slot group divided into three. In the example shown in the figure, since the number of phases of the AC motor is 3, 36 basic slot groups are divided into three equal parts for the coil 4 and assigned to the coils of each of the three phases. When is M, 36 basic slot groups may be divided into M equal parts for the coil 4 and assigned to the coils of each phase of the M phase.

FIG. 5 is a developed sectional view illustrating the winding arrangement of the three-phase coil assigned by the first allocation example shown in FIG. 4 in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. .. In FIG. 5, the cross section of the stator is viewed from above.

By allocating the coils of each of the three phases to the coil 4 described with reference to FIG. 3 according to the first allocation example described with reference to FIG. 4, two windings are wound in each of the 36 slots. A stator 1 having a two-layer winding coil in which the coils are evenly arranged is obtained.

FIG. 6 is a developed sectional view illustrating a second allocation example of each phase coil in the case where the basic slot group has a 7-slot pitch in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure.

In the second allocation example shown in FIG. 6, 36 (= M · N) basic slot groups are equally divided into 3.2 (= M · 2) positions with respect to the coil 4 described with reference to FIG. Cut the crossover line (cut at the position of the broken line in the figure).

That is, the crossover line between the 6th basic slot group and the 7th basic slot group arranged on the 2nd lap in the circumferential direction of the stator core 3 is cut, and the 1st to 6th continuous basics are cut. Let the slot group be the first slot group. The crossover line between the 12th basic slot group and the 13th basic slot group arranged on the 3rd lap in the circumferential direction of the stator core 3 is cut, and the 7th to 12th continuous basic slot groups are cut. Is the second slot group. The crossover line between the 18th basic slot group and the 19th basic slot group arranged on the 4th lap in the circumferential direction of the stator core 3 is cut, and the 13th to 18th continuous basic slot groups are formed. Is the third slot group. The crossover line between the 24th basic slot group and the 25th basic slot group arranged on the 5th lap in the circumferential direction of the stator core 3 is cut, and the 19th to 24th continuous basic slot groups are cut. Is the fourth slot group. Cut the crossover between the 30th basic slot group and the 31st basic slot group arranged on the 6th lap in the circumferential direction of the stator core 3, and form a continuous basic slot group from the 35th to the 30th. It is a fifth slot group. Further, the continuous basic slot group from the 31st to the 36th is referred to as a sixth slot group. As a result, the coil 4 is divided into 6 slot groups according to 5 cutting points.

The six slot groups are the first of the six phase bands, that is, the first slot group, so that the windings of the coils of each phase are evenly distributed to the slot 2 in order along the circumferential direction of the stator core 3. 1st phase band (eg-U phase) on one winding of the coil, 1st winding on the 1st coil of the 2nd slot group (winding at the same position as the 1st slot group) 2nd Phase band (for example, + V phase), 1st coil winding of the 1st coil of the 3rd slot group (winding at the same position as the 1st slot group), 3rd phase band (for example, -W phase), 4th 4th phase band (for example, + U phase) in one winding of the first coil of the slot group (winding at the same position as the first slot group), 1 of the first coil of the fifth slot group. One winding of the 5th phase band (for example, -V phase) in one winding (winding at the same position as the 1st slot group), 1 winding of the 1st coil of the 6th slot group (same as the 1st slot group) It is assigned to the winding of the position) in the order of the sixth phase band (for example, + W phase). In the example shown in the figure, since the number of phases of the AC motor is 3, 36 basic slot groups are divided into 6 equal parts for the coil 4 and assigned to the coils of each of the 6 phases. When is M, 36 basic slot groups may be equally divided into M and 2 with respect to the coil 4 and assigned to the coils of each of the M and 2 phases. By these simple operations, a plurality of coil groups allocated up to the phase band can be obtained. Since the coils of each coil group are periodically connected by leader wires in the circumferential direction, the intersection of the leader wires does not occur.

FIG. 7 is a developed sectional view illustrating the winding arrangement of the three-phase coil assigned by the second allocation example shown in FIG. 6 in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. .. In FIG. 7, the cross section of the stator is viewed from above.

By allocating the coils of each of the three phases to the coil 4 described with reference to FIG. 3 according to the second allocation example described with reference to FIG. 6, two windings are wound in each of the 36 slots. A stator 1 having a two-layer winding coil in which the coils are evenly arranged is obtained.

Subsequently, the reason why the windings are evenly arranged in each slot will be described by simply arranging MN pieces of the basic slot group periodically and continuously in the circumferential direction, which is the main point of the embodiment of the present disclosure. First, an example of a similar physical phenomenon will be explained, and then the mathematical background will be explained.

One example of a similar physical phenomenon is an analog clock (12-hour clock) used in ordinary households. An analog clock is a machine that keeps track of time. The minute hand of the minute hand represents the "minute" of the time from 0 to 59, and the hour hand of the short hand represents the "hour" of the time from 0 to 11. For example, if 5 hours have passed since 0:00, the minute hand points to 0 and the hour hand points to 5. The time will return to 0:00 after 11:59. That is, the time ticked by the clock has a periodicity of 12 hours.

If the start time is set to 0:00 and the time is ticked by +5 hours (recording the time) under the setting of the 12-hour clock of the analog clock, there is a periodicity of 12 hours, so 0:00 → 5:00 → 10:00 → 3:00 → 8:00 → 1:00 → 6:00 → 11:00 → 4:00 → 9:00 → 2:00 → The time is ticked in the order of 7:00 → 0:00, and after ticking 12 kinds of time, it returns to the original 0:00. Starting from 0:00, the time is ticked by 5 hours, and then while returning to 0:00, the hour hand rotates the clock 5 times, and the elapsed time at that time is 12 hours and 5 rotations = 60 hours.

As described above, when the time is ticked by +5 hours with 0:00 as the start time, the time ticks 12 kinds of time, while the hour hand goes around the clock 5 times. It also returns to the original time after 60 hours, which is the least common multiple of 12 and 5. This phenomenon occurs not only when the ticking time is +5 hours, but also when a relatively prime number such as +7 hours, +11 hours, +13 hours, and +25 hours is selected.

On the other hand, if the start time is 0:00 and the time is ticked by +6 hours, then 0:00 → 6:00 → 0:00 → 6:00 → ..., and 0:00 and 6 Only two types of hours are ticked, and no other time is ticked. This is because the greatest common divisor of 12 and 6 is 6, and if the time is ticked by 6 hours, the cycle will be at the same time of 0:00 and 6:00.

The minute hand of the "analog-type clock hour hand" is omitted to use an MN time clock instead of a 12-hour clock, which is regarded as a "fixer with MN slots" and "+ X hours each time". If "carving" is regarded as "circulating slots in the circumferential direction by X slot pitch in the circumferential direction", when the stators of MN slots are circulated in the circumferential direction by + X slot pitch, X If the value of is a number that is mutually exclusive to MN, the slots from slot identification number 1 to MN are patrolled once, and even after straddling the slots by the number of MN. Return to the position of. While straddling the slots by the number of M, N, and X, the path that goes around each slot goes around the stator by X rotations. This is because the integer multiple of X does not match MN, and the number of slots is the same as the number of MN X (the least common multiple of MN and X) where the integer multiple of X and the integer multiple of MN match for the first time. This is to return to the original position after starting straddling. Moreover, since the number of slots M and N of the stator is a multiple of the number of phases M, the "path of the circulating slot identification number" is evenly divided by the M phase.

Here, the above-mentioned "path of the patrol slot identification number" is referred to as a "slot trajectory". For example, when the number of slots MN = 36 and X = 7, the slot trajectory in which the number is added by +7 with the slot identification number 1 as the first term is "1 → 8 → 15 → 22 → 29 → 36 → 7 →". 14 → 21 → 28 → 35 → 6 → 13 → 20 → 27 → 34 → 5 → 12 → 19 → 26 → 33 → 4 → 11 → 18 → 25 → 32 → 3 → 10 → 17 → 24 → 31 → 2 → 9 → 16 → 23 → 30 → ”(→ 1, repeated thereafter), and is represented by a sequence of 36 slot identification numbers and an arrow symbol“ → ”. Dividing the slot orbit evenly by the M phase means dividing the above-mentioned slot orbit into M equal parts. That is, in the case of three-phase alternating current of M = 3, "1 → 8 → 15 → 22 → 29 → 36 → 7 → 14 → 21 → 28 → 35 → 6 →", "13 → 20 → 27 → 34 → 5 → 5 → 12 → 19 → 26 → 33 → 4 → 11 → 18 → ”,“ 25 → 32 → 3 → 10 → 17 → 24 → 31 → 2 → 9 → 16 → 23 → 30 → ”. By giving each phase band to these evenly divided slot orbits, it is possible to construct an electrically balanced motor. For example, assign the -U phase to "1 → 8 → 15 → 22 → 29 → 36 → 7 → 14 → 21 → 28 → 35 → 6 →" and "13 → 20 → 27 → 34 → 5 → 12 → 19 → 19 →". Assign the -V phase to "26 → 33 → 4 → 11 → 18 →" and assign the -W phase to "25 → 32 → 3 → 10 → 17 → 24 → 31 → 2 → 9 → 16 → 23 → 30 →". This makes it possible to configure an AC motor that is electrically balanced.

For the above-mentioned slot trajectory, the same phenomenon occurs even if the starting slot identification number is not 4 but a number of another slot identification number is selected. For example, if slot identification number 4 is started and +7 is added, the slot trajectory will be "4 → 11 → 18 → 25 → 32 → 3 → 10 → 17 → 24 → 31 → 2 → 9 → 16 → 23 → 30 → 1". → 8 → 15 → 22 → 29 → 36 → 7 → 14 → 21 → 28 → 35 → 6 → 13 → 20 → 27 → 34 → 5 → 12 → 19 → 26 → 33 → ”(→ 4, repeat thereafter) Become. The second slot activation with different first terms is evenly divided by three phases, and + U phase, + V phase, and + W phase are assigned. That is, + U phase is assigned to "4 → 11 → 18 → 25 → 32 → 3 → 10 → 17 → 24 → 31 → 2 → 9 →" and "16 → 23 → 30 → 1 → 8 → 15 → 22 → 29". → 36 → 7 → 14 → 21 → ”is assigned the + V phase, and“ 28 → 35 → 6 → 13 → 20 → 27 → 34 → 5 → 12 → 19 → 26 → 33 → ”is assigned the + W phase. Even if the first term of the slot trajectory is changed to another number, all slot numbers are patrolled in the same way.

The slot identification number of the three slot orbits divided into -U phase, -V phase, and -W phase, and the slot identification of the three slot orbits divided into + U phase, + V phase, and + W phase. When combined with the numbers and regarded as windings accommodated and arranged in slots in the stator, two windings are arranged in each slot. The windings of each phase band assigned by the divided slot trajectories perfectly match the arrangement of the windings in the first allocation example of FIG.

The slot trajectory may be divided by 2M, or may be divided by an integer of 2 or more × M. For example, in a slot trajectory where the number of slots is 36, X = 7, and the first term is 1, when dividing by 6 which is twice 3, it becomes "1 → 8 → 15 → 22 → 29 → 36 →". -Assign the U phase, assign the + V phase to "7-> 14-> 21-> 28-> 35-> 6->", assign the -W phase to "13-> 20-> 27-> 34-> 5-> 12->", and "19-> Assign + U phase to "26 → 33 → 4 → 11 → 18 →", assign -V phase to "25 → 32 → 3 → 10 → 17 → 24 →", and assign "31 → 2 → 9 → 16 → 23 → 30". → ”is assigned the + W phase. On the other hand, in the slot orbit with the first term shifted by +3, the + U phase is assigned to "4 → 11 → 18 → 25 → 32 → 3 →" and -V to "10 → 17 → 24 → 31 → 2 → 9 →". Allocate a phase, assign + W phase to "16 → 23 → 30 → 1 → 8 → 15 →", assign -U phase to "22 → 29 → 36 → 7 → 14 → 21 →", and assign "28 → 35 →". By assigning the + V phase to "6 → 13 → 20 → 27 →" and the -W phase to "34 → 5 → 12 → 19 → 26 → 33 →", the second allocation shown in FIGS. 6 and 7. Get the same winding arrangement as in the example.

If X is not a relatively prime number with the number of slots M and N of the stator, the slot trajectory cannot go around all the slots. For example, when the number of slots = 36 and X = 18, if the slot with the identification number 1 is used as the first term and the +18 slot pitch is circulated in the circumferential direction, the slot trajectory becomes "1 → 19 → 1 → 19 → ...". Only two slots, the slot with slot identification number 1 and the slot with slot identification number 19, are patrolled. This is because the greatest common divisor of 36 and 18 is 18. Therefore, the slot orbit circulates by 18 slot pitches and does not circulate all the slots evenly, and the slot orbit cannot evenly divide all the slots by three phases.

When the number of slots MN and X are relatively prime, the slot orbit can pass through all the slot identification numbers even if the slot identification numbers at the start of the orbit (the first term of the slot orbit) are different. does not change. Therefore, the following Proposition 1 and Proposition 2 are established.

[Proposition 1]
When the basic slot group is repeatedly arranged in the stator slot by MN at the slot pitch X, the number of windings arranged in one slot (the number of layers in one slot) is the basic slot group. Matches the total number of windings placed in.
[Proposition 2]: (Equivalent to Proposition 1)
Assuming that the number of turns of the windings arranged in each of the X slots of the basic slot group is n ₁ , n ₂ , ..., N _X , the basic slot group is continuously MN at the slot slot pitch X of the stator. When repeatedly arranged, the number of turns arranged in each slot is n ₁ + n ₂ + ... + n _X (n ₁ , n ₂ , ..., n _X is an integer of 0 or more).

Proposition 1 and Proposition 2 are strictly proved by Proposition 4 described later. Further, for example, in the case of FIG. 4 which is the embodiment of the present disclosure, since the number of windings arranged in one basic slot group is 2, if it is considered that two slot trajectories having different first terms exist, all of them are considered. Two windings are arranged in each of the slots to form a two-layer winding slot. Further, from Proposition 2, it is possible to easily adjust the number of turns per slot arranged in the stator. For example, when it is desired to increase the number of turns arranged in one slot, the total number of turns of the entire stator can be easily increased by increasing the number of turns arranged in the basic slot group.

In the following, the explanation will be based on algebra of mathematics. For various basic matters such as set theory, group theory, ring theory and basics of modules on rings, and details of each theorem, refer to the introductory book on algebra (for example, Non-Patent Document 1 (Akihiko Yukie, "" "Introduction to Algebra 1 Group Theory", Japan Critics, February 15, 2019), Non-Patent Document 2 (Akihiko Yukie, "Algebra 2 Rings, Body and Galois Theory", Japan Critics, October 25, 2019 )Such). The notation of the symbol "on top of =" in each equation indicates that the elements of the set on the left side and the elements of the set on the right side have a 1: 1 correspondence.

Generally, the Chinese Remainder Theorem shown in Equation 1 is known as a property of relatively prime integers in the ring theory of algebra.

Here, p and q are relatively prime integers. Z represents a set of integers and is called a ring of integers. pZ, qZ, and (p · q) Z represent a set of multiples of p, a set of multiples of q, and a set of multiples of p · q, respectively, and are called ideals. Z / pZ, Z / qZ, and Z / (p · q) Z are the set of remainders obtained by dividing an integer by p, the set of remainders obtained by dividing an integer by q, and the remainder obtained by dividing an integer by p · q. It shows a set and is called a quotient ring. When the elements of each quotient ring of Z / pZ, Z / qZ, and Z / (p · q) Z are displayed, the equations 2 to 4 are obtained. The element of each quotient ring is the number of the remainder obtained by dividing an integer, and in order to distinguish it from a general integer, it is expressed as "a character with a bar added on the number" in each formula. Further, for the element whose remainder is 0 in the quotient ring, p, q, p · q are used instead of being expressed as 0.

The "x" in Equation 1 represents the direct product of the set, and the two components of the two sets are displayed at the same time. Further, the relationship between both sides of Eq. 1 is the mapping f which is the bijection of the set and its inverse image f ^-1 (f: Z / pZ × Z / qZ → Z / (p · q) Z, f ^-1 :. It means that Z / (p · q) Z → Z / pZ × Z / qZ) exists.

Further, on the premise of the theorem of Equation 1, the following proposition 3 holds.

[Proposition 3]
When the map φ: Z / pZ → Z / (p · q) Z is a surjective function of equivalent density, they are via the map ψ: Z / (p · q) Z → Z / qZ surjective function. Composite map ψφ: Z / pZ → Z / qZ is also surjective with equivalent density.

Further, a set in which an addition "+" in the ring of integers is used as an operation and a scalar multiple is determined is defined as a Z module. As in Proposition 3, the Z module on the Z / pZ surplus ring is SPZ, the Z module on the Z / _qZ surplus ring is T _qZ , and the Z module on the Z / (p · q) Z surplus ring is Z. When the module is U _{(p · q) Z} , the following proposition is established by applying the proposition 3 to the linear mapping of the Z module on the ring of integers (the arithmetic operation and the mapping that keeps the scalar multiple).
[Proposition 4]
When the map φ': S _pZ → U _{(p · q) Z} is a surjective function of equivalent density, they are combined via the map ψ': U _{(p · q) Z} → T _qZ surjective function. Map ψ'φ': S _pZ → T _qZ is also surjective with equivalent density.

Here, "surjective function of equivalent density" means B among the elements a ₁ , a ₂ , ..., An of the set _A in the mapping F: A → B of the surjective function from the set A to B. The elements (a _i , a _j , a) of the set A projected on b in the relationship of one element b of the above and F (a _i ) = F (a _j ) = F ( _ak ) ... = b. Let _k , ...) be surjective with equal numbers in any element b of the set B. That is, an equivalent density surjective is a map of surjective functions in which the number of elements of A transferred to any two different elements b ₁ and b ₂ of the set B is always equal.

Propositions 3 and 4 are equivalent by applying the first to third isomorphisms theorems of rings or additions in the inclusion relationship between the Chinese Remainder Theorem shown in Equation 1 and the Remainder Rings and Integer Rings shown in Equation 5. It is proved by assuming the total emission of the concentration.

Since pZ and qZ are subsets and ideals of the ring of integers Z, equations 6 and 7 can be obtained from the second isomorphism theorems of the rings from their equivalence.

Equations 6 and 7 are applied to the third isomorphism theorems shown in Equations 8 and 9.

In equations 8 and 9, in the quotient ring Z / (p · q) Z, the quotient rings Z / qZ or Z / pZ are equivalence relations, and the grouped quotient rings are isomorphic to Z / pZ and Z / qZ, respectively. Means that Further, in Equations 8 and 9, from the first isomorphism theorems, Kerφ "= Z / qZ or Kerψ" = Z / pZ as the core of the surjective φ ": Z / (p · q) Z → Z / pZ. , Ψ ": Z / (p · q) Z → Z / pZ is clear, and the surjective function φ": Z / (p · q) Z → Z / pZ, the reverse image φ " ^-1 : It suffices if a map corresponding to Z / pZ → Z / (p · q) Z can be constructed. Proposition 3 is established by applying the above-mentioned surjective function of equivalent density as one of the methods of taking the inverse image of surjective function. Also, the same proof is applied to the Z module on each quotient ring to obtain Proposition 4.

In Proposition 3 and Proposition 4, when the element of Z / pZ is projected onto the element of Z / qZ, if the mapping: Z / pZ → Z / (p · q) Z is uniformly projected, Z / (p. -Q) Z → Z / qZ also shows that there is always a map that is uniformly projected, and as a result, the Z / pZ element is uniformly projected onto the Z / qZ element. For example, the number of slots is 36, the integer X that is relatively prime to it is 7, the set of identification numbers of the basic slot group is regarded as the quotient ring Z / 7Z, and the set of slot identification numbers of the stator is the quotient ring Z / 36Z. I catch it. Here, when considering the mapping from the residual ring Z / 7Z to the residual ring Z / 36Z, the number of elements of Z / 7Z is 7, and the number of elements of Z / 36Z is 36, so each element is 1: 1. Although it is not possible to simply construct a corresponding map, the structure of Z / 7Z is once uniformed to Z / 252Z, which is configured as a natural homomorphism from Z to 252Z, which is a common part of 7Z and 36Z. The structure of Z / 252Z is uniformly projected onto Z / 36Z by dividing each element of Z / 252Z projected and uniformly projected by 36 and dividing the group according to the value of the remainder. Moreover, the map is surjective with equivalent density.

Proposition 3 and Proposition 4 will be described below with reference to FIGS. 1, 2 and 3. Even if each slot of the basic slot group shown in FIG. 1 is evenly arranged in the 36 slots of the stator, the number of slots of the stator and the number of slots of the basic slot group are multiples as shown in FIG. Since the above does not match, the basic slot group can be arranged only up to 35 slots. Rather than arranging the basic slot group only for one cycle of the slot of the stator, as shown in Fig. 3, 36 slots are multiplied by 7 with the stator, and there are a total of 252 virtual slots. Thinking that, 36 copies of the basic slot group corresponding to 7 slots were copied, and each basic slot group was continuously connected while maintaining the order relationship of the slot identification numbers in the basic slot group, resulting in a total of 252 slots. After that, it becomes possible to place (project) in each of the virtual 252 slots of the stator. Also, assign numbers 1 to 252 in order to each of the virtual 252 slots in which the basic slot group is evenly arranged, divide the number by 36, and use the remaining value as the new slot identification number. Then, slot identification numbers 1 to 36 are given (at this time, the one whose division remainder is 0 is considered to be 36), and 252 slots are evenly associated with 36 slots (projection). ) Is possible. As a result, the structure of the basic slot group corresponding to 7 slots is evenly projected onto the 36 slots of the stator. Proposition 3 or Proposition 4 is from 252 slots to 36 slots if there is an even projection method (surjective function of equivalent density) from the basic slot group with 7 slots to 252 slots. Guarantee that there is always an even projection method. As a method of projecting from 252 slots to 36 slots, the projection to 36 slots is uniquely determined by grouping groups with the same value obtained by dividing the 252 slot identification numbers by 36 of the number of slots. ..

Comparing FIG. 5 showing the first allocation example with FIG. 7 showing the second allocation example, even if the winding arrangement is in the basic slot group having the same 7-slot pitch, the winding arrangement of each phase coil It can be seen that if the allocation method is different, the winding arrangement of each slot is different as a result. Generally, the winding coefficient is known as an index for investigating the number of poles of the magnetic poles of the stator in which the winding is arranged. The polarity of the stator can be grasped by the primary winding coefficient of the AC motor. The winding coefficient is obtained by performing a discrete Fourier transform on the number of turns of each winding of one phase arranged in each slot of the stator, with the central angle at the electrical angle of the stator slot as the discrete variable of the position, and further calculating the calculation result. It is obtained by dividing by the total number of turns of the winding, standardizing, and taking the absolute value. The winding coefficient takes a value from 0 to 1, and the central angle of the two poles (= one pole pair) of the number of poles of the rotor is one wavelength at the time of the discrete Fourier transform (the primary component of the winding coefficient). Cycle). The larger the primary winding coefficient, the larger the torque of the AC motor. On the other hand, the smaller the higher-order winding coefficient, the smaller the torque pulsation (torque ripple) of the AC motor. For example, even if the amount of magnetic flux per pole in the rotor is greatly increased by increasing the amount of magnets in order to increase the torque of the motor, if the value of the higher-order winding coefficient is small, the torque is increased. However, the pulsation of torque becomes small. In particular, the winding coefficient of the multiple of 3 also affects the reduction of iron loss. If it is desired to increase the torque and reduce the iron loss, an arrangement in which the winding coefficient of the multiple of 3 is reduced may be selected. Table 1 shows the winding coefficient of the winding arrangement according to the first allocation example and the winding coefficient of the winding arrangement according to the second allocation example, where the magnetic poles of the rotor are 10 poles. In addition, for comparison, the winding coefficients of the winding arrangement according to the third allocation example described later are also shown.

Comparing the primary winding coefficient of the winding arrangement according to the first allocation example and the primary winding coefficient of the winding arrangement according to the second allocation example, the primary winding of the winding arrangement according to the second allocation example. Since the coefficient is larger than the primary winding coefficient of the winding arrangement according to the first allocation example, it can be seen that the torque of the AC motor is large. This indicates that the larger the number of divisions of the 36 (= MN) basic slot group, the larger the winding coefficient. Further, in both the winding arrangement according to the second allocation example and the winding arrangement according to the first allocation example, the high-order winding coefficient is close to 0, which is considerably smaller than that of a general conventional AC motor. This is a good indication of the characteristics of fractional slot type AC electric machines in which the "number of slots per pole and phase" (number of slots / (number of poles / number of phases)) is not an integer but an irreducible fraction.

In general, if it is possible to make all the coil pitches of the coils arranged in the stator the same for the winding coefficient, then "winding coefficient" = ("complex at the center of the coil with the number of turns of the coil as the coefficient". It can be expressed by multiplying the two terms of "average sum of vectors") and ("reduction by phase difference due to coil pitch of one coil"). The term "average sum of complex vectors at the center of the coil with the number of turns of the coil as the coefficient" is called the distributed winding coefficient, and the term "reduction due to the phase difference due to the coil pitch of one coil" is called the short section coefficient. ing. In particular, the fractional slot type AC motor has a feature that the value of the high-order distributed winding coefficient can be reduced.

In the basic slot group, the winding can be arranged at any position. In the above-described embodiment, the windings are arranged so as to be one annular coil in the basic slot group consisting of 7 slot pitches, but the windings are arranged so as to be two annular coils as in the third allocation example shown below, for example. It may be arranged. As a result, the winding coefficients are different in each of the embodiments of the present disclosure. Each winding arrangement may be selected so that the required characteristics can be obtained according to the intended use of the motor.

FIG. 8 is a developed cross-sectional view illustrating a third allocation example in the case where the basic slot group has a 7-slot pitch in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. In FIG. 8, the upper row shows the stator 1 seen from the upper surface, and the lower row shows the stator 1 seen from the side surface.

In the basic slot group consisting of 7 slot pitches, for example, two annular coils are arranged. The coil 4 has a winding that is accommodated in slot 2 of slot identification numbers 1 and 4 and a coil end that is not accommodated in slot 2 in the basic slot group consisting of slots 2 of slot identification numbers 1 to 7. A first annular coil comprising a first annular coil and a second annular coil comprising a winding portion accommodated in slot 2 of slot identification numbers 4 and 7 and a coil end not accommodated in slot 2 are provided. Be done. By connecting the wire extending from the first annular coil and the wire toward the second annular coil in the slot 2 of the slot identification number 4, a figure eight annular coil is formed in the basic slot group.

FIG. 9 is a developed cross section illustrating the coil arrangement allocated by the third allocation example shown in FIG. 8 over one circumference in the circumferential direction in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a figure.

FIG. 10 is a developed cross section illustrating the coil arrangement allocated by the third allocation example shown in FIG. 8 over 7 turns in the circumferential direction in the stator of the 36-slot three-phase AC motor according to the embodiment of the present disclosure. It is a figure. In the third allocation example, as in the second allocation example, 36 basic slot groups are divided into 6 slot groups, and 6 types of phase bands are assigned to one winding of each slot group. 6 coils. Get a swarm. In FIG. 10, the cross section of the stator is viewed from above.

As shown in FIG. 9, in the stator core 3 in which 36 slots are arranged in the circumferential direction of the stator core 3, the basic slot group shown in FIG. 8 having a 7-slot pitch is 5 in the circumferential direction. Individuals can be placed repeatedly. FIG. 9 shows the same basic slot group arrangement as in FIG. 2 except for the configuration in the basic slot group. By repeating the basic slot group as shown in FIG. 3 and taking the same phase band combination as in FIG. 6, FIG. 11 Get the winding arrangement of. As shown in FIG. 10, the windings of the coil 4 are arranged in all 36 slots. As shown in FIG. 10, 36 slots are obtained by allocating coils for each of the three phases to a group of six coils obtained by, for example, dividing the coil 4 in which windings are arranged in all of the 36 slots into six evenly. A stator 1 is obtained with four layers of slots in which four windings are evenly distributed in each of the two.

FIG. 11 is a developed sectional view illustrating a variation in coil arrangement in one basic slot group when the basic slot group is set to 7 slot pitch in the stator of a 36-slot three-phase AC motor according to the embodiment of the present disclosure. be. In FIG. 11, the upper row shows the stator 1 seen from the upper surface, and the lower row shows the stator 1 seen from the side surface.

In the basic coil group of the pattern A shown in FIG. 11, the winding 41 is housed in the slot 2 of the slot identification numbers 2 and 6, and one annular coil is formed. That is, the coil 4 is a coil which is a winding portion which is accommodated in the slot 2 of the slot identification numbers 2 and 6 and a portion which is not accommodated in the slot 2 in the basic slot group consisting of the slots 2 of the slot identification numbers 1 to 7. It is composed of an annular wire consisting of an end. According to Proposition 1, the total number of windings of the basic slot group is 2 on the upper surface of the pattern A shown in FIG. 11. Therefore, when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 2.

In the basic coil group of the pattern B shown in FIG. 11, a first annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 2 and 6 and a coil end not accommodated in the slot 2 is provided. , A second annular coil including a winding portion accommodated in slot 2 of slot identification numbers 3 and 5 and a coil end not accommodated in slot 2 is provided. The basic slot group is formed by connecting the wire extending from the winding of slot 2 of the slot identification number 6 of the first annular coil and the wire toward the winding of slot 2 of slot identification number 3 of the second annular coil. A double annular coil is formed in. According to Proposition 1, the total number of windings of the basic slot group is 6 on the upper surface of the pattern B shown in FIG. 11. Therefore, when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 6.

In the basic coil group of the pattern C shown in FIG. 11, a first annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 1 and 5 and a coil end not accommodated in the slot 2 is provided. A second annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 2 and 6 and a coil end not accommodated in the slot 2 is provided. The basic slot group is formed by connecting the wire extending from the winding of slot 2 of the slot identification number 5 of the first annular coil and the wire toward the winding of slot 2 of slot identification number 2 of the second annular coil. A double annular coil is formed in. According to Proposition 1, the total number of windings of the basic slot group is 10 on the upper surface of the pattern C shown in FIG. 11. Therefore, when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 10.

In the basic coil group of the pattern D shown in FIG. 11, a first annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 4 and 2 and a coil end not accommodated in the slot 2 is provided. , A second annular coil including a winding portion accommodated in slot 2 of slot identification numbers 4 and 7 and a coil end not accommodated in slot 2 is provided. However, the winding direction of the coil differs between the first annular coil and the second annular coil. By connecting the wire extending from the first annular coil and the wire toward the second annular coil in the slot 2 of the slot identification number 4, a figure eight annular coil is formed in the basic slot group. According to Proposition 1, the total number of windings of the basic slot group is 8 on the upper surface of the pattern D shown in FIG. 11. Therefore, when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 8.

In the basic coil group of the pattern E shown in FIG. 11, the wave winding coil 4 is formed so that the windings are arranged in the slots 2 of the slot identification numbers 1 and 6. According to Proposition 1, the total number of windings of the basic slot group is 2 on the upper surface of the pattern E shown in FIG. 11. Therefore, when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 2.

In the basic coil group of the pattern F shown in FIG. 11, the wave winding coil 4 is formed so that the windings are arranged in the slots 2 of the slot identification numbers 1, 3, 5 and 7. According to Proposition 1, the total number of windings of the basic slot group is 4 on the upper surface of the pattern F shown in FIG. 11. Therefore, when MN of the basic slot groups are arranged, the number of layers of each slot is increased. 4.

Each pattern of the basic slot group consisting of the above-mentioned 7-slot pitch is an example, and the winding may be arranged in any one of the slots 2 in the 7-slot pitch in the basic slot group, and the winding of the other pattern may be arranged. Line arrangement is also possible.

FIG. 12 is a developed sectional view illustrating a variation in coil arrangement in one basic slot group when the basic slot group is set to 5 slot pitch in the stator of a 36-slot three-phase AC motor according to the embodiment of the present disclosure. be. In FIG. 12, the upper row shows the stator 1 seen from the upper surface, and the lower row shows the stator 1 seen from the side surface.

In the stator of a 36-slot three-phase AC motor, the number of phases M is 3, so N is 12. As positive integers X that are relatively prime to the value 36 obtained by 3 (= M) and 12 (= N), 1, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31 , And 35, but here, as an example, 5 is selected as a positive integer X that is relatively prime for the value 36.

In the basic coil group of the pattern A shown in FIG. 12, the winding 41 is housed in the slot 2 of the slot identification numbers 2 and 4, and one annular coil is formed. That is, the coil 4 is a coil which is a winding portion which is accommodated in the slot 2 of the slot identification numbers 2 and 4 and a portion which is not accommodated in the slot 2 in the basic slot group consisting of the slots 2 of the slot identification numbers 1 to 5. It is composed of an annular wire consisting of an end. According to Proposition 1, the total number of windings of the basic slot group is 2 on the upper surface of the pattern A shown in FIG. 12, so that when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 2.

In the basic coil group of pattern B shown in FIG. 12, a first annular coil including a winding portion accommodated in slot 2 of slot identification numbers 1 and 5 and a coil end not accommodated in slot 2 is provided. A second annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 2 and 4 and a coil end not accommodated in the slot 2 is provided. The basic slot group is formed by connecting the wire extending from the winding of slot 2 of the slot identification number 5 of the first annular coil and the wire toward the winding of slot 2 of slot identification number 2 of the second annular coil. A double annular coil is formed in. According to Proposition 1, the total number of windings of the basic slot group is 8 on the upper surface of the pattern B shown in FIG. 12, so that when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 8.

In the basic coil group of the pattern C shown in FIG. 12, a first annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 1 and 4 and a coil end not accommodated in the slot 2 is provided. A second annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 2 and 5 and a coil end not accommodated in the slot 2 is provided. The basic slot group is formed by connecting the wire extending from the winding of slot 2 of the slot identification number 4 of the first annular coil and the wire toward the winding of slot 2 of slot identification number 3 of the second annular coil. A double annular coil is formed in. According to Proposition 1, the total number of windings of the basic slot group is 10 on the upper surface of the pattern C shown in FIG. 12, so that when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 10.

In the basic coil group of the pattern D shown in FIG. 12, a first annular coil including a winding portion accommodated in the slot 2 of the slot identification numbers 3 and 1 and a coil end not accommodated in the slot 2 is provided. , A second annular coil including a winding portion accommodated in slot 2 of slot identification numbers 3 and 5 and a coil end not accommodated in slot 2 is provided. However, the winding direction of the coil differs between the first annular coil and the second annular coil. By connecting the wire extending from the first annular coil and the wire toward the second annular coil in the slot 2 of the slot identification number 3, a figure eight annular coil is formed in the basic slot group. According to Proposition 1, the total number of windings of the basic slot group is 10 on the upper surface of the pattern D shown in FIG. 12, so that when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 10.

In the basic coil group of the pattern E shown in FIG. 12, the wave winding coil 4 is formed so that the windings are arranged in the slots 2 of the slot identification numbers 1 and 5. According to Proposition 1, the total number of windings of the basic slot group is 2 on the upper surface of the pattern E shown in FIG. 12, so that when MN of the basic slot groups are arranged, the number of layers of each slot is increased. It is 2.

In the basic coil group of the pattern F shown in FIG. 12, the wave winding coil 4 is formed so that the windings are arranged in the slots 2 of the slot identification numbers 1, 3 and 5. According to Proposition 1, the total number of windings of the basic slot group is 3 on the upper surface of the pattern F shown in FIG. 12, so that when MN of the basic slot groups are arranged, the number of layers of each slot is 3. Is.

Each pattern of the basic slot group consisting of the above-mentioned 5-slot pitch is an example, and the winding may be arranged in any one of the slots 2 in the 5-slot pitch in the basic slot group, and the winding of the other pattern may be arranged. Line arrangement is also possible. Further, the number of slots of the stator in which the basic slot group is arranged is not limited to 36, and the patterns A to F (X = 7) shown in FIG. 11 and the A to A to 12 shown in FIG. The pattern F (X = 5) is applicable as long as MN and X are relatively prime.

Subsequently, a method for manufacturing a stator of a three-phase AC motor according to the embodiment of the present disclosure will be described with reference to FIGS. 13 to 26. The following description is similarly valid for the three-phase AC motor having the number of poles and the number of slots described above.

First, a first embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure will be described.

FIG. 13 is a developed sectional view illustrating a first embodiment of a method for manufacturing a stator of an M-phase AC motor according to an embodiment of the present disclosure. Here, as an example, a method of manufacturing a stator having a basic slot group consisting of a 7-slot pitch in a 36-slot three-phase AC motor will be described.

First, in the stator core forming step, a stator core having 36 (= 3.12) slots arranged in the circumferential direction is formed. In the step of forming the stator core, an insulating member that electrically insulates between the stator core and the coil may be attached to the stator core, but this is omitted in the description of the present embodiment.

Next, in the winding arrangement step, 7 (= X), which are positive integers relatively prime to 36 (= 3.12 = MN), are wound in any of the slots adjacent to each other in the circumferential direction. The basic slot group obtained by arranging the lines is repeatedly arranged in the circumferential direction.

For example, as shown in FIG. 13, in the first basic slot group consisting of slots 2 having slot identification numbers 1 to 7, the winding and slot 2 which are the portions accommodated in slots 2 of slot identification numbers 1 and 4 It forms an annular coil consisting of a coil end that is an unaccommodated portion. Then, 36 (= 3.12 = MN) basic slot groups, which are the same as the winding arrangement of the first basic slot group, are repeatedly arranged in the circumferential direction of the stator core 3 to form 36 pieces. Windings can be evenly distributed in all slots. FIG. 13 shows a case where five stator cores 3 are repeatedly arranged over one circumference in the circumferential direction in order to simplify the drawing. It should be noted that the stator 1 of the 3 (= M) phase AC motor may be created in which the basic slot group is repeatedly arranged by a smaller number than 36 in the circumferential direction of the stator core 3.

Subsequently, a second embodiment of the method for manufacturing the stator of the M-phase AC motor according to the embodiment of the present disclosure will be described.

FIG. 14 is a perspective view showing an inserter winding device used in the second embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure.

In the second embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure, the inserter winding device 500 is used. The inserter winding device 500 is provided with a blade 501 having an outer diameter slightly smaller than the inner diameter of the inner rotor type stator core 3 and having the same width as the tooth tip of the teeth of the stator core 3. .. The number of blades 501 corresponds to the number of slots in the stator of the M-phase AC motor to be manufactured.

In the second embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure, first, in the stator core forming step, a cylindrical hollow and MN slots arranged in the circumferential direction are used. And to form a stator core with. Next, in the blade preparation step, when X is a positive integer that is relatively prime to the value obtained by MN, one X blade 501 adjacent to each other in the circumferential direction in the inserter winding device 500 is used. The winding is arranged in any one of the X blades 501 in the basic blade group when the basic blade group is used. In the blade preparation step, MN pieces of the basic blade group are arranged in the circumferential direction of the inserter winding device 500. Next, in the winding arrangement step, by inserting the inserter winding device 500 in which the winding is arranged on the blade 501 in the basic blade group into the stator core 3, the winding arranged on the blade 501 is inserted into the stator. When the X slots 2 adjacent to each other in the circumferential direction of 1 are used as one basic slot group, the winding is arranged in the slot 2 by transferring to one of the X slots 2 in the basic slot group. do.

The method for manufacturing a stator using the inserter winding device according to the second embodiment can be applied to both the annular coil and the wave winding coil.

In the second embodiment, the stator having an annular coil can be manufactured by using an inserter winding device as follows.

FIG. 15 is a perspective view showing the positional relationship between the inserter winding device and the annular coil in the second embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure.

In the second aspect of the method for manufacturing the stator of the M-phase AC motor according to the embodiment of the present disclosure, the coil 4 formed in an annular shape is hung on the blade 501. For example, when the slot pitch X of the basic slot group of the stator of a 36-slot three-phase AC motor is 7, in the blade preparation step, 7 (= X) blades adjacent to each other in the circumferential direction in the inserter winding device 500 Is arranged as one basic blade group, the winding is arranged on any one of the 7 (= X) blades 501 in the basic blade group. FIG. 15 shows, as an example, a state in which an annular coil 4 is hung on three blades 501 so as to correspond to a winding arrangement for three slots in the basic slot group consisting of the seven slot pitch shown in FIG. ing.

FIG. 16 is a top view illustrating a second embodiment of a method for manufacturing a stator having an annular coil of an M-phase AC motor according to the embodiment of the present disclosure.

In the blade preparation step, MN pieces of the basic blade group are arranged in the circumferential direction of the inserter winding device 500. For example, when the slot pitch X of the basic slot group of the stator of a 36-slot 3-phase AC motor is 7, as shown in FIG. 16, in the process 1 of the blade preparation step, the basic slot pitch is composed of the 7 slot pitch shown in FIG. An annular coil 4-1 is hung on the three blades 501 in the basic blade group consisting of 7 (= X) blades so as to correspond to the winding arrangement for three slots in the slot group. Next, in the process 2, the annular coil 4-2 is hung on the basic blade group adjacent to the basic blade group in which the annular coil 4-1 is arranged in the circumferential direction. Next, in the process 3, the annular coil 4-3 is hung on the basic blade group adjacent to the basic blade group in which the annular coil 4-2 is arranged in the circumferential direction. Next, in the process 4, the annular coil 4-4 is hung on the basic blade group adjacent to the basic blade group in which the annular coil 4-3 is arranged in the circumferential direction. Next, in the process 4, the annular coil 4-4 is hung on the basic blade group adjacent to the basic blade group in which the annular coil 4-3 is arranged in the circumferential direction. Next, in the process 5, the annular coil 4-5 is hung on the basic blade group adjacent to the basic blade group in which the annular coil 4-4 is arranged in the circumferential direction. Next, in the process 6, the annular coil 4-6 is hung on the basic blade group adjacent to the basic blade group in which the annular coil 4-5 is arranged in the circumferential direction. Although not shown in FIG. 16, the coil 4-1 to the coil 4-6 are connected by a crossover. Further, by mounting the coils 4-1 to 4-6, for example, the coil 4 corresponding to the first slot group in the example of the second embodiment of the present disclosure is completed. Hereinafter, although not shown in FIG. 16, the same process is repeated in process 6 and subsequent steps, and finally, the annular coils are arranged in 36 (= MX) basic blade groups. Then, in the winding arrangement step, by inserting the inserter winding device 500 in which the winding is arranged on the blade 501 in the basic blade group into the stator core 3, the winding arranged on the blade 501 is rotated in the circumferential direction. The winding of the annular coil is arranged in the slot 2 by transferring to the slot 2 in the group of 36 (= MX) basic slots arranged in the line.

In the manufacturing method using the above-mentioned inserter winding device, all the coils 4 of the stator are inserted by rotating the blade 501 of FIG. 14 with the Z axis as the rotation axis by a constant angle and repeatedly inserting the coils. It will be placed on the blade 501.

In the second embodiment, the stator having a wave winding coil can be manufactured by using an inserter winding device as follows. In this second embodiment, it is assumed that the number of slot groups is 6 in total.

17 to 19 show the positional relationship between the inserter winding device and the wave winding coil arranged in the blade preparation step in the second embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure. In a perspective view, FIG. 17 shows a wave winding coil corresponding to the first slot group, FIG. 18 shows a wave winding coil corresponding to the second slot group, and thereafter, similarly to the third to sixth. FIG. 19 shows a state in which the wave winding coil corresponding to the slot group is hung on the blade. FIG. 20 is a top view showing a wave winding coil in which the first to sixth slot groups have been arranged in the second embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure.

In the second aspect of the method for manufacturing the stator of the M-phase AC motor according to the embodiment of the present disclosure, the coil 4 formed into a wave winding shape is hung on the blade 501. For example, when the slot pitch X of the basic slot group of the stator of a 36-slot three-phase AC motor is 7, in the blade preparation step, 7 (= X) blades adjacent to each other in the circumferential direction in the inserter winding device 500 The coil 4 is hooked on any one of the seven blades 501 in the basic blade group when the above is regarded as one basic blade group. In FIGS. 17 to 19, as an example, the length corresponding to the 7-slot pitch of the basic slot group is set to one cycle of the wave winding coil 4, and the basic slot group undulates alternately in the 4 slots and the 3 slots in the cycle. In the blade group, the coil 4 is hooked on the three blades 501, and the coil 4 having a length corresponding to the four blades 501 is arranged outside the blade 501. As shown in FIGS. 17 to 19, the coil 4 formed into a wave-shaped shape is arranged on the blade for each round, and finally the coil having a wave-shaped shape for seven turns as shown in FIG. 20. 4 is hung on the blade 501. Then, in the winding arrangement step, by inserting the inserter winding device 500 in which the winding is arranged on the blade 501 in the basic blade group into the stator core 3, the winding arranged on the blade 501 is rotated in the circumferential direction. The winding of the wave winding coil is arranged in the slot 2 by transferring to the slot 2 in the group of 36 (= MX) basic slots arranged in the line. As a result, a wave winding coil that undulates alternately in 4 slots and 3 slots in the 1 cycle with a 7 slot pitch as one cycle is formed in the stator core 3.

Subsequently, a third embodiment of the method for manufacturing the stator of the M-phase AC motor according to the embodiment of the present disclosure will be described.

FIG. 21 is a developed sectional view illustrating a third embodiment of a method for manufacturing a stator of an M-phase AC motor according to an embodiment of the present disclosure. Here, as an example, a method of manufacturing a stator having a basic slot group consisting of a 7-slot pitch in a 36-slot three-phase AC motor will be described.

First, in the stator core forming step (process 1), the stator core 3 having 36 (= 3.12 = MN) slots 2 arranged in the circumferential direction is formed.

Next, in the flat wire generation step, a U-shape having a first side and a second side substantially parallel to each other and a third side connecting the first side and the second side by using a wire material that can be a coil. Generate a plurality of flat lines formed in.

Next, in the flat wire accommodating step (process 2), when 7 (= X) is a positive integer that is relatively prime for 36 (= MN), 7 (= X) adjacent to each other in the circumferential direction. A plurality of basic slot groups obtained by accommodating the first side and the second side of the flat wire in any of the slots 2 are formed in the circumferential direction. In the example shown in FIG. 21, as an example, in the first basic slot group consisting of slots 2 having slot identification numbers 1 to 7, the first side of the flat wire is accommodated in slot 2 of slot identification number 1, and the second side is accommodated. It is housed in slot 2 of slot identification number 4. In the second basic slot group consisting of slots 2 having slot identification numbers 8 to 14, the first side of the flat wire is housed in slot 2 of slot identification number 8, and the second side is housed in slot 2 of slot identification number 11. .. In the third basic slot group consisting of slots 2 having slot identification numbers 15 to 21, the first side of the flat wire is housed in slot 2 of slot identification number 15, and the second side is housed in slot 2 of slot identification number 18. .. In the fourth basic slot group consisting of slots 2 having slot identification numbers 22 to 28, the first side of the flat wire is housed in slot 2 of slot identification number 22, and the second side is housed in slot 2 of slot identification number 25. .. In the fifth basic slot group consisting of slots 2 having slot identification numbers 29 to 35, the first side of the flat wire is housed in slot 2 of slot identification number 29, and the second side is housed in slot 2 of slot identification number 32. .. Although not shown in FIG. 21, processing 2 is repeated in the sixth and subsequent basic slot groups adjacent to the fifth basic slot group, and finally in 36 (= MX) basic slot groups. By accommodating the first side and the second side of the flat wire in the slot 2, the first side and the second side of the flat wire are evenly accommodated in all 36 slots.

Next, in the coil forming step (process 3), a part of the first side of one basic slot group and a part of the second side of the other basic slot group are bent between adjacent basic slot groups. Then, by joining each other at the connection point T, a wave winding coil in which windings are housed is formed in each slot 2 in each basic slot group. Although not shown in FIG. 21, the process 3 is repeated in the sixth and subsequent basic slot groups adjacent to the fifth basic slot group, and finally in 36 (= MX) basic slot groups. By accommodating the first side and the second side of the flat wire in the slot 2, a wave winding coil in which the first side and the second side of the flat wire are evenly accommodated is formed in all 36 slots.

Subsequently, a fourth embodiment of the method for manufacturing the stator of the M-phase AC motor according to the embodiment of the present disclosure will be described with reference to FIGS. 22 to 26.

In the fourth embodiment of the method for manufacturing the stator of the M-phase AC motor according to the embodiment of the present disclosure, X is a positive integer that is mutually elementary with respect to the value obtained by MN (N is a positive integer). When, a flat wire having a wave winding shape having X slots adjacent to each other in the circumferential direction of the stator core as one basic slot group and a length corresponding to the basic slot group for one cycle of the wave winding. Corresponds to the first flat wire forming step to be molded, the second flat wire forming step in which the flat wire is wound in an annular shape, and the slot provided in the stator core from the radial outside of the rectangular wire wound in an annular shape. It comprises a coil forming step of forming a wave-wound coil in which a winding composed of a part of a rectangular wire is accommodated in a slot by inserting a plurality of magnetic materials having a groove shape.

FIG. 22 is a perspective view illustrating a first flat wire forming step in a fourth embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure.

As described above, when X is a positive integer that is relatively prime to the value obtained by M and N (N is a positive integer), one X slot adjacent to the circumferential direction of the stator core is set. The basic slot group of. In the first flat wire forming step, as shown in FIG. 22, the length corresponding to the X slot pitch of the basic slot group is set to one cycle of the wave winding coil 4 for the flat wire which is a wire material that can be a coil. Mold into a wavy shape.

FIG. 23 is a perspective view illustrating a second flat wire forming step in the fourth embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure.

In the second flat wire forming step, the flat wire formed into the wavy shape shown in FIG. 22 is wound in an annular shape as shown in FIG. 23. FIG. 24 is a perspective view showing a state in which a flat wire formed into a wavy shape is wound in an annular shape in the fourth embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure.

25 and 26 are perspective views illustrating the coil forming step in the fourth embodiment of the method for manufacturing a stator of an M-phase AC motor according to the embodiment of the present disclosure.

In the coil forming step, as shown in FIG. 25, by inserting a plurality of split cores 11 made of a magnetic material having a groove shape corresponding to the slot 2 provided in the stator core 3 from the outside. A winding composed of a part of a flat wire forms a wave winding coil 4 housed in the slot 2. As a result, as shown in FIG. 26, a wave winding coil 4 in which windings are arranged in MN slots 2 arranged in the circumferential direction of the stator core 3 is formed. When forming the stator core 3 having MN slots 2, the angle occupied by the divided cores 11 in the circumferential direction of the stator core 3 is "360 degrees / (MN)". The divided cores 11 are formed in the above, and MN of such divided cores 11 are connected to each other.

FIG. 27 is a cross-sectional view illustrating the positional relationship between the stator and the rotor of the M-phase AC motor according to the embodiment of the present disclosure.

FIG. 27 shows, as an example, a rotor and a stator of an inner rotor type M-phase AC motor. A rotor is provided inside the stator core 3 of the stator of the M-phase AC motor according to the embodiment of the present disclosure described above so as to face each other in the radial direction. The rotor includes a rotor core 6 including a rotating shaft, and a rotor magnetic pole 5 which is a magnet provided on the radial surface of the rotor core 6. The embodiment of the present disclosure is also applicable to an outer rotor type M-phase AC motor. In this case, the stator core is formed with a slot that opens on the outer peripheral side, and is inside the stator core. , Rotors are provided facing each other in the radial direction.

FIG. 28 is a diagram illustrating the appearance of an M-phase AC motor including a stator according to the embodiment of the present disclosure.

The three-phase AC motor 1000 according to the embodiment of the present disclosure includes the stator 1 described above and the rotor 10 radially opposed to the stator 1. In the figure, reference numeral 3 indicates a stator core a, and reference numeral 4 indicates a coil. The coil 4 includes a winding 41 accommodated in the slot and a coil end 42 not accommodated in the slot. Reference numeral 5 indicates a rotor magnetic pole which is a magnet provided on the rotor 10, and reference numeral 6 indicates a rotation axis of the rotor 10.

1 Stator 2 Slot 3 Stator core 4 Coil 5 Rotor pole 6 Rotor core 7 Rotor shaft 11 Split core 41 Winding 41P + (plus) winding 41N- (minus) winding 42 Coil end 43 Lead wire 500 Insertor winding device 501 blade

Claims (12)

A stator core, MN slots (M and N are positive integers respectively) arranged in the circumferential direction of the stator core, and a winding through which an alternating current of any one of the M phases flows. A stator of an M-phase AC motor with multiple coils consisting of
When X is a positive integer that is relatively prime to the value obtained by M and N, X of the X slots adjacent to each other in the circumferential direction are regarded as one basic slot group, and X in the basic slot group. The winding is placed in any of the slots of the
A stator in which the basic slot group in which the winding is arranged in any of the X slots is repeatedly arranged in the circumferential direction at a cycle of slot pitch X. The stator according to claim 1, wherein the basic slot group in which the winding is housed in any of the X slots is arranged in MN pieces in the circumferential direction. The stator according to claim 1 or 2, wherein the coil is a coil formed into a wavy shape. The stator according to claim 1 or 2, wherein the coil is a coil formed into an annular shape. The stator according to any one of claims 1 to 4, wherein a plurality of continuous basic coil groups are electrically connected by a coil end or a lead wire and a phase band is assigned. The stator according to any one of claims 1 to 5 and the stator.
Rotors arranged radially facing the stator and
Equipped with an M-phase AC motor. A method for manufacturing a stator of an M-phase AC motor including a plurality of coils composed of windings through which an AC current of any one of the M-phases (M is a positive integer) flows.
A stator core forming step for forming a stator core having MN slots (N is a positive integer) arranged in the circumferential direction,
When X is a positive integer that is relatively prime to the value obtained by M and N, the basic obtained by arranging the winding in any of the X slots adjacent to each other in the circumferential direction. A winding arrangement step in which slots are repeatedly arranged in the circumferential direction at a cycle of slot pitch X, and
A method of manufacturing a stator. The method for manufacturing a stator according to claim 7, wherein in the winding arrangement step, MN pieces of the basic slot group are arranged in the circumferential direction. A method for manufacturing a stator of an M-phase AC motor including a plurality of coils composed of windings through which an AC current of any one of the M-phases (M is a positive integer) flows.
A stator core forming step for forming a stator core having a cylindrical hollow and MN (N is a positive integer) slots arranged in the circumferential direction.
When X is a positive integer that is relatively prime for the values obtained by M and N, the basics when X blades adjacent to each other in the circumferential direction are used as one basic blade group in the inserter winding device. A blade preparation step in which the winding is placed on any of the X blades in the blade group.
By inserting the inserter winding device in which the windings are arranged on the blades in the basic blade group into the stator core, the windings arranged on the blades are inserted into the blades at a cycle of slot pitch X. When the X slots adjacent to each other in the circumferential direction are used as one basic slot group, the winding is arranged in the slot by transferring to any one of the X slots in the basic slot group. Winding arrangement step and
A method of manufacturing a stator. The method for manufacturing a stator according to claim 9, wherein in the blade preparation step, MN pieces of the basic blade group are arranged in the circumferential direction of the inserter winding device. A method for manufacturing a stator of an M-phase AC motor including a wave-wound coil composed of windings through which an AC current of any one of the M-phases (M is a positive integer) flows.
A stator core forming step for forming a stator core having MN slots (N is a positive integer) arranged in the circumferential direction,
A flat line generation step for generating a plurality of U-shaped flat lines having a first side and a second side substantially parallel to each other and a third side connecting the first side and the second side. ,
When X is a positive integer that is relatively prime to the value obtained by M and N, the first side of the flat line and the first side of the flat line in any of the X slots adjacent to each other in the circumferential direction. A flat wire accommodating step in which a plurality of basic slot groups obtained by accommodating two sides are formed in the circumferential direction in a cycle of slot pitch X, and
Between the adjacent basic slot groups, a part of the first side of one of the basic slot groups and a part of the second side of the other basic slot group are bent and joined to each other. In the coil forming step of forming the wave winding coil in which the winding is housed in the slot in each basic slot group.
A method of manufacturing a stator. A method for manufacturing a stator of an M-phase AC motor including a wave-wound coil composed of windings through which an AC current of any one of the M-phases (M is a positive integer) flows.
When X is a positive integer that is relatively prime to the value obtained by M and N (N is a positive integer), X slots adjacent to each other in the circumferential direction of the stator core are used as one basic slot group. A first flat wire forming step for forming a flat wire having a wavy shape having a length corresponding to the basic slot group for one cycle of the wavy winding.
A second flat wire forming step in which the flat wire is wound in a ring shape,
By inserting a plurality of magnetic materials having a groove shape corresponding to the slot provided in the stator core from the radial outside of the flat wire wound in an annular shape, a part of the flat wire can be inserted. A coil forming step in which the winding is housed in the slot to form the wave winding coil.
A method of manufacturing a stator.

Images