JPH02269450A - Stator coil - Google Patents

Abstract

PURPOSE:To reduce a torque ripple by a method wherein a back electromotive voltage of the whole of phases of a second coil pole group obtained by summing up the counter electromotive voltages of coil poles on both planes serially is made to equal to the value of the counter electromotive voltage of the whole of a first coil pole group. CONSTITUTION:The number of turns of a pattern conductor for one pole on a plane on one side of each of sheet coils 20, 20' and 20'' is N1, N2 and N3 (N1<N2< N3) respectively. Lamination is made in the sequence of a phase U, a phase V and a phase W with a shift of 2pi/3 of an electrical angle from each other, and sheet layers are fixed to each other by a bonding agent or the like. In an electromagnetic element of a motor, the sheet coil of the phase U is disposed on the side of the position whereat a magnetic field intensity is high, while the sheet coil of the phase W is disposed on the side of the position whereat the intensity is low. Each of the the numbers N1, N2 and N3 of turns of the sheet coils of the phases is set at such a value as makes it possible to equalize the amount of linkage to a magnetic flux at the fixed position thereof corresponding to the distribution of the magnetic field intensity in the electromagnetic element of the motor, and therefore the value of a counter electromotive voltage generated between the ends of the sheet coil of each phase becomes equal to the others when the sheet coils are incorporated in the motor.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a stator coil for a motor formed of a patterned conductor (a thin film conductor formed in a spiral shape by a manufacturing method such as etching or plating). It's about structure.

[Conventional technology]

A conventional motor is shown in FIG. 1, which is an example using a flat 8-pole, 3-phase, 24-pole stator coil formed by winding. Fig. 2 is a plan view of one phase of the coil of this motor, Fig. 3 is an explanatory diagram of the relative position of each phase coil, and Fig. 4 is a plan view of the magnetic poles of the rotor magnet. is the second
Three coils of the shape shown in the figure are stacked as shown in Figure 3 so that the coil poles are shifted from each other by mm (electrical angle) in the direction of the rotational force of the rotor magnet 2, and fixed as shown in Figure 1. It has a configuration in which it is fixed onto the surface of the child yoke 3 with adhesive or the like. The shape, wire diameter, and number of turns of each phase coil of the stator coil are the same.
In the motor electromagnetic section, the magnetic pole surface of the rotor magnet 2 faces the coil so that the magnetic flux interlinks with the coil.

Furthermore, stator yoke 3. A cup-shaped shield case 4 is provided to enclose the coil and rotor magnet 2 to prevent the leakage magnetic field of the rotor magnet 2 from leaking to the outside of the shield case 4.

The magnetic flux distribution of the rotor magnet 2 in the electromagnetic section of this motor is shown in FIGS. 5 and 6. FIG. 5 is an axial distribution diagram, and FIG. 6 is a circumferential distribution diagram.

In addition to reaching the stator yoke 3, the magnetic flux 1o of the rotor magnet 2 also leaks to the rotating shaft 6 side, leaks to the shield case 4 side, and enters adjacent magnetic poles of the rotor magnet 2 in a short-circuit manner. be. The magnetic flux that reaches the stator yoke 3 interlinks with all phase coils 1゜1'1' of the stator coil on the magnetic flux path, but the magnetic flux that leaks to the shield case 4, rotating shaft 6, and adjacent magnetic poles is It is either unlinked to all phase coils, linked to some coils, or not linked to any coils. Therefore, the amount of flux linkage differs depending on each phase coil, and in this conventional motor in which the shape and number of turns of each phase coil are made equal, the back electromotive force induced in each phase coil by the rotation of the rotor magnet 2 are different. Generally, in a DC motor, the generated torque τ and the back electromotive force e of the coil for one phase.

There is a relationship between the following equations. That is, τcc g ,
・T-6・・・・・・・・・・・・・・・(1) Here, r is the average driving radius, and t is the current flowing through the coil.

The average drive radius is limited by the radial position of the coil relative to the rotor magnet. Further, the back electromotive force e0 is also a function of both the amount of magnetic flux interlinked with the coil conductor and the radial position of the chain portion. Therefore, when a constant current is applied to each phase coil with the same installation position size and shape, such as radial position, the torque generated between each phase coil and rotor magnet is proportional to the back electromotive voltage value e6 of each phase. It turns out. Therefore, in this example where there is a difference in the back electromotive voltage value between the phases, there is a difference in one generated torque between the phases corresponding to the respective back electromotive voltage difference. FIG. 7 shows a model of the back electromotive force waveform generated in each phase of the stator coil of this conventional example.

The stator coil has U, V, and W phases in order from the coil closest to the magnetic pole surface of the rotor magnet 2, and the back electromotive force waveform is a sine wave, and the m width ratio is 3:2:1. Figure 8 shows the generated torque waveform when a current with a constant amplitude is applied to each phase by switching in three phases.
There is a torque ratio of 3:2:1 between the phases corresponding to the amplitude ratio of the back electromotive force, and the resultant torque τ has a waveform with large ripples as shown in the figure.

The frequency of the fundamental wave is equal to the frequency of the torque generated by each phase coil, and harmonics of three times this frequency are superimposed thereon. This becomes a dominant factor causing uneven rotation of the motor rotating shaft.

FIGS. 9 and 10 are diagrams showing examples of actual measurement results of back electromotive force and magnetic flux density in the electromagnetic section of a flat motor using a conventional stator coil. Figure 9 shows the back electromotive force and the
Figure 0 shows the components of the magnetic flux density in the direction of the rotation axis, each expressed as a relative value. For the experiment, the outer diameter was 40 nm and the inner diameter was 12 nm.
, 5mm thick and circumference 2.6m (1 phase thickness 0.75m)
The stator coil was used, and the distance between the rotor magnet magnetic pole surface and the stator yoke surface was set to 3.1no. As a result,
The relative values of the back electromotive force have a ratio of 1, 0.87, and 0.80 between the phases, starting from the coil closest to the magnetic pole surface of the rotor magnet 2.

This becomes the torque ratio between each phase. The ripple of the resultant torque is approximately ±12%. In addition, the ratio of the magnetic flux density values at the positions of each phase coil is approximately equal to the ratio of the back electromotive force mentioned above. Also, if the distance error is set to 4no. and the coil thickness is set to 3.5 mm, the magnetic flux density distribution will also be significantly The back electromotive force ratio is 1:0.
85: 0.70, and the ripple of the composite torque is ±
This increases to 18%.

[Problem to be solved by the invention]

As mentioned above, in this type of conventional stator coil, (
1) There is a drawback that a large torque ripple occurs on the rotating shaft based on the magnetic flux distribution characteristics of the electromagnetic part, which is the main cause of uneven rotation of the rotating shaft. Furthermore, (2) since it is manufactured by winding a thin wire, special winding equipment is required, and the winding work takes time and increases costs. Furthermore, (3) it is difficult to make the shape of the coil poles uniform, and the accuracy of the arrangement angle of the poles is also low, resulting in low output stability. Also, (4)! There are disadvantages such as: (5) it is difficult to construct a thin motor because it is difficult to manufacture a shaped coil; and (5) space is required within the stator coil for terminal connection of each coil pole.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to equalize the values of the back electromotive voltages generated in each phase, and to construct a motor with low torque ripple and high output stability at a low cost. is to provide stator coils.

[Means to solve the problem]

In order to achieve the above object, in the stator coil of the present invention.

The coil poles of the coil pole group of multiple phases are spirally formed with patterned conductors on a plurality of different planes arranged in a direction sequentially moving away from the magnetic pole surface of the rotor magnet, and when the rotor magnet rotates, the coil poles are spirally formed with patterned conductors. A stator coil in which the value of the back electromotive force generated in the coil pole group of each phase is made equal or substantially equal between the phases due to a change in magnetic flux from the magnetic pole surface of the rotor magnet.

Coil poles of the same phase are divided into a plurality of planes, including an opposing plane near the magnetic pole surface of the rotor magnet and an opposing plane far from the magnetic pole surface b1, and are concentric with the rotation axis of the rotor magnet. a first coil pole group arranged in a shape; and a coil pole group forming a phase different from the first coil pole group, the plurality of coil pole groups having the first coil pole group divided and arranged. It is divided into a plurality of planes, including an opposing plane arranged on a side farther from the magnetic pole face of the rotor magnet than the opposing plane, and an opposing plane arranged on a nearer side, and relative to the rotation axis of the rotor magnet. A second coil pole group arranged concentrically;

[Effect]

In the first coil pole group, the coil poles are arranged on a plurality of planes, a plane near the magnetic pole surface of the rotor magnet and a plane far from the magnetic pole surface, so the coil poles on the plane near the magnetic pole surface are
When a patterned conductor is interlinked with magnetic flux in a relatively strong magnetic field, the back electromotive force generated per unit length of this patterned conductor is relatively high. When a patterned conductor is interlinked with magnetic flux in a weak magnetic field, the back electromotive force generated per unit length of the conductor is relatively low. The back electromotive voltages of the coil poles on both planes are added in series to form the back electromotive voltage of the entire phase of the first coil pole group.

The second coil pole group is arranged on a plane farther from the magnetic pole surface of the rotor magnet than the coil poles arranged closer to the magnetic pole surface of the rotor magnet among the coil poles of the first coil pole group. The coil poles have a smaller amount of interlinkage with the magnetic flux than the coil poles of the first coil pole group, so the value of the back electromotive force per unit length of the patterned conductor is also lower, and conversely,
Among the coil poles of the first coil pole group, the coil poles arranged on a plane closer to the magnetic pole surface of the rotor magnet than the coil poles arranged on the side farther from the magnetic pole surface of the rotor magnet are Since the first coil pole group has a larger amount of interlinkage with the magnetic flux than the coil poles, the value of the back electromotive force per unit length of the patterned conductor is high. The back electromotive voltages of the coil poles on both planes are added in series to form the back electromotive voltage of the entire phase of the second coil pole group, which is equal to the value of the back electromotive force of the entire first coil pole group. or approximately equal.

(Example) The present invention will be described below based on Examples. Figures 11 and 12 show the structural side openings of sheet coils constituting the stator coil of the present invention, and Figure 11 shows one sheet. Fig. 12 is a plan view of the shaped coil, and Fig. 12 is an enlarged view of its coil poles. Fig. 13 is a cross-sectional view of the pattern, and Fig. 14 is a wiring diagram. This example also has a coil pole configuration with eight poles. A spiral pattern conductor 12 of eight poles is formed on the front and back surfaces of a thin film-like insulating sheet 11, respectively, and the front and back coil poles are connected in series by a through-hole electrode 14 provided at the center inside each coil pole. All 16 coil poles on the front and back sides are connected in series without increasing the coil thickness.The patterned conductors 12 on the front and back sides of the insulating sheet 11 have almost the same shape and are formed at the same position so as to overlap each other on the front and back sides. The spiral directions of the patterned conductor 12 of the coil poles are opposite to each other in adjacent poles, and coil terminal electrodes 13.13' are formed from the patterned conductor at the beginning and end of the winding. The surface of the patterned conductor 12 is covered with a thin insulating film 15 to prevent short circuits even when laminated.In a sheet coil with a zero-wire structure, al, cL, etc.
α is the pattern coil on the surface of the sheet, cL1'
,' ・・・・・・・・・α, ′ are the patterns α and 1 coil on the back side. The connection order of each pattern coil is as follows. That is, the terminal electrode 13 at the beginning of the first turn
Surface pattern coil α1 ~ through-hole electrode P□ ~ back pattern coil α,' ~ back pattern coil cL, 1
~Through hole electrode P2~Surface pattern coil 42~Surface pattern coil 43~... Back pattern coil α,'~Through hole electrode P, ~Surface pattern coil α, ~End of winding terminal electrode 13 ′,
The pattern conductor 12 can be manufactured by etching, plating, or a combination of these methods.

The cross-sectional area of the pattern conductor 12 is controlled by the pattern width wp and the pattern thickness tp. As a stator coil for a motor, it is desirable that the amount of interlinkage with the magnetic flux of the motor electromagnetic part (the electromagnetic part between the motor stator and the rotor) is large and the resistance is low, since the motor efficiency can be increased.

For this purpose, in this seal coil, the patterned conductor 12
The thickness ip is made as thick as possible to increase the cross-sectional area and the resistance is lowered, while the inter-conductor gap gP is made as narrow as possible to increase the number of turns to concentrate the pattern conductor group on the outer periphery of the coil pole and increase the magnetic flux. Try to increase the amount of linkage. The shape of each coil pole also affects the efficiency and rotational smoothness of the motor.

Therefore, the shape of the coil pole must be such that the performance can be improved. For example, in the case of a brushless motor, in the case of a zero-sheet coil, the horizontal shape of the coil is shaped to have a large amount of interlinkage with the magnetic flux and a small torque ripple in accordance with the distribution shape of the magnetic flux generated from the magnetic poles of the rotor magnet. With this method, complicated coil pole shapes can be easily and uniformly manufactured, and the arrangement angle precision of the upper coil poles can be very high, so the rotational stability of the motor 8 force can also be greatly improved. In addition, for the side opening of the fist body manufactured by the chemical method as described above, Fig. 15 shows the number of turns N of the pattern conductor of the sheet coil of each phase corresponding to the magnetic field distribution of the motor electromagnetic part. This is a configuration example in which the pattern conductor length is changed between phases to equalize the amount of magnetic flux linkage in each phase and equalize the back electromotive force between the phase coils. Sea 1-Coil 20
is a U-phase coil, sheet coil 20' is a V-phase coil, sheet coil 20' is a W-phase coil, and the number of turns of the pattern conductor per pole on one side of each plane is N1. N,,N□(N
1<N2<N3), and the coil pole dimensions and installation radius positions of each phase are the same. The layers are stacked in the order of U phase, ■ phase, and W phase with an electrical angle of b shifted from each other, and each sheet layer is fixed with an adhesive or the like. In the motor electromagnetic section, the U-phase sheet coil is placed on the side where the magnetic field strength is high, and the W-phase sheet coil is placed on the side where the magnetic field strength is low. The number of turns of the sheet coil in each phase is N,, N,.

N is set to a value that corresponds to the magnetic field strength distribution in the motor electromagnetic section and equalizes the amount of interlinkage with the magnetic flux at that fixed position, so when installed in the motor, the sheet coils of each phase The back electromotive voltage values generated between the ends are equal to each other. The method of connecting the pattern conductors in each sheet coil is the same as that for the sheet coil shown in FIG. 11 above. In this structure, when the space occupied by the pattern conductor is the same for each phase, the cross-sectional area of the U-phase and V-phase pattern conductors with fewer turns is made larger than the cross-sectional area of the W-phase pattern conductor, resulting in even lower resistance. It can be done.

By lowering the resistance, it is possible to increase the torque generated by the motor and reduce copper loss in the coil, thereby improving remoter efficiency. Sheet coil stackingAs mentioned above, the back electromotive force generated at the coil poles is a function of both the radial position where the coil poles are installed and the amount of magnetic flux linkage, and the amount of magnetic flux linkage is also a function of the amount of magnetic flux linkage of the conductor. The number of turns is the product of the conductor length and the amount of magnetic flux. Therefore, by independently changing any one of the installation radial position, conductor length, and magnetic flux amount of the coil pole, or by changing the combination of these conditions in conjunction, the The value of the back electromotive voltage can be changed.

Figure 17 shows an example in which the radial dimension of each coil pole is changed between each phase to change the length of the pattern conductor, and at the same time the radial installation position of the coil pole is changed to equalize the back electromotive force of each phase. This is a configuration example in case. The number of turns, pattern conductor cross-sectional area, and outermost coil diameter (To) are equal for each phase. Sheet coil 20"' is U-phase coil, sheet coil, JIII is V-phase coil, sheet coil 20HII
I is a W-phase coil whose radial lengths are Δr and Δr, respectively.
at Δr3 (ΔT × Δr, <Δr), and the stacking method and coil pole connection method are the same as in the case of the stator coil of the first embodiment. In the stator coil of this structure, terminal wiring pattern conductors, frequency signal generation pattern conductors for speed control, etc. are installed in the blank space on the inner circumference of the sheet coil, which has a short radial length, and the necessary functions as a motor are fixed. It can be integrated and added to the child coil, allowing the motor to have a compact configuration. The number of laminated sheet coils is equivalent to 2
The same applies when the number of sheets is more than one.

Further, in a configuration in which the radial dimension of the coil pole is varied between phases, the number of turns, the cross-sectional area of the patterned conductor, the outermost diameter dimension of the coil, etc. may be varied between phases. In particular, the outermost diameter dimension of the coil is changed between each phase, and the outermost diameter dimension of the coil pole arrangement on the sheet surface on the side near the magnetic pole surface of the rotor magnet and the center position of the coil pole are changed.
The configuration in which the coil poles on the sheet surface on the side far from the magnetic pole surface of the rotor magnet are provided at larger radius positions than those of the coil poles has the following characteristics. That is, in this configuration, when the rotor magnet rotates, the rate of change of the magnetic field of the rotor magnet with respect to the coil conductor is such that the coil poles closer to the magnetic pole surface of the rotor magnet are faster than the coil poles farther away. big. Therefore, the value of the back electromotive force generated in the coil conductor of unit length is higher at the closer coil pole. Therefore, the length of the conductor of the coil pole on the near side can be further shortened by that amount from this point as well.This is an example of a sheet coil configuration in which the length of the pattern conductor is changed by changing the length of the coil between each phase. The number of coil poles is reduced for sheet coils of phases installed in positions with high magnetic flux, and the number of coil poles is increased for sheet coils of phases installed in positions of low magnetic flux, so that the amount of magnetic flux linkage is equalized between each phase. Equalize the back electromotive force generated.

This figure shows an example in which the number of coil poles is 7 per plane on one side.

In the case of this embodiment as well, as in the case of the second embodiment, a coil end unwired pattern conductor etc. is provided in the blank area where the coil pattern is not provided on the sheet coil surface to achieve a structure that further improves productivity. I can do it.

As a method of changing the number of coil poles, we have described an example of a configuration in which the stiffness is changed using separate methods, but the same effect as described above can be obtained by using a combination of these methods.

3-phase stator Koino with a total of 6 sheet coils in VL layer!
A mode is shown in which the trochanter magnet is fixed on the surface of the stator yoke 3 so as to face the magnetic pole surface of the 2-net. The six sheet coils each have the same coil pole size, 9 turns, pattern conductor size, etc. An example of a configuration in which the stacking order of the sheet coils is reversed for the upper three sheets and the lower three sheet coils, and the length of the pattern conductor is changed as a method of magnetic flux linkage for the total of two sheet coils. Radial installation position of the sheet coils Or, a configuration example in which the installation position in the gap direction is changed, or a configuration example in which these are combined has been described. If these are used differently depending on the type and structure of the motor, the effects of each will be further utilized.

FIG. 20 is an explanatory diagram of the generated torque of a motor using the stator coil of the present invention. The stator coil of the present invention is configured so that the back electromotive voltage values between the phases are equal, and the generated torque values are also equal between each phase, and the resultant torque is only a harmonic component of a frequency three times the switching frequency of each phase current. The amount of ripple is approximately ±8% or less. The rotational unevenness of the rotating shaft of a motor is generally proportional to the amount of torque ripple and inversely proportional to the ripple frequency. Therefore, when the stator coil of the present invention is used, the uneven rotation of the motor shaft can be significantly reduced compared to the conventional stator coil.

FIGS. 21 and 22 are explanatory diagrams of the torque vs. rotation speed characteristics and torque vs. current characteristics of a motor using the stator coil of the present invention. FIG. 21 shows a coil in which the 1-lux constant of the motor is kept constant and the resistance value of the stator coil is reduced in the number of turns as shown in FIG. When the voltage applied to the coil is constant, the torque versus rotation speed characteristic line 4o of a motor incorporating a coil with a small resistance value shifts to the side where the torque value increases compared to the characteristic line 41 in the case of a coil with a large resistance value. .

The figure in the figure is the steady operating point (steady rotational speed π5, steady load torque τ,), 0 is the maximum torque point that can be generated by a motor with characteristic 41 at rotational speed 7Lj, and IO is the maximum torque that can be generated by a motor with characteristic 40. It is a point. As is clear from this figure, by setting the stator coil to a low resistance characteristic of 40, the torque change width (referred to as torque margin) when the load torque increases at a steady rotation speed can be made larger (τ1.!1> In addition, since the starting torque can be made larger (τjtx>τjtz), the starting time of the motor can be shortened. Furthermore, copper loss in the stator coil can be reduced, and motor efficiency can be improved accordingly.

FIG. 22 is an explanatory diagram of the characteristics of the favorite stator coil when the torque margin is fixed at a constant value (τ□). The stator coil having the characteristic 40' in the figure has a larger number of turns than the stator coil having the characteristic 4o in FIG. 21, and has an increased 1-lux constant. The 21st point is to equalize the back electromotive voltage value of each phase coil and to make the cross-sectional area of the pattern conductor as wide as the winding space allows to reduce the coil resistance value.
This is similar to the stator coil having the characteristic 40 shown in the figure.

1 - In this stator coil with an increased torque constant, the torque vs. current characteristic becomes a characteristic as shown in characteristic 43, in which the current value decreases with respect to the load torque. This coil can reduce the load current value at the steady operating point, reducing power consumption in the output stage of the drive electronic circuit and copper loss in the coil, making it possible to significantly improve motor efficiency.

〔Effect of the invention〕

According to the present invention, by using a stator coil, (1) it is possible to eliminate the back electromotive force difference between the phases, so the torque ripple generated by the motor can be extremely reduced, and rotational unevenness can be significantly reduced;

(2) Since the coil resistance can be reduced without reducing the torque constant value of the motor, it is possible to increase the torque generated by the motor and improve the motor efficiency.

(3) The torque control range during steady rotation can be widened and the startup time can be shortened.

(4) Since the coil can be easily formed into a thin shape, a thin motor can be constructed.

(5) Y! Since i production is done using chemical methods such as etching and plating, the multi-polar structure coil is also highly accurate, low cost, and
Can be produced in a short time.

(6) Costs can be reduced because each phase coil can be easily made into a continuous structure between poles, and the number of terminal processing steps can be significantly reduced.

(7) It is easy to automate 112 works.

(8) Since the uniformity and arrangement precision of the coil pole shape can be improved, the stability of the motor output can be improved.

Effects such as this can be obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional motor, Figs. 2 and 3 are plan views showing the structure of the stator coil, Fig. 4 is a plan view of the magnet, and Figs. 5 and 6 are the electromagnetic parts of the motor. Magnetic flux distribution diagram, Figure 7 is an explanatory diagram of the back electromotive force waveform due to the conventional stator coil, Figure 8 is an explanatory diagram of the motor torque waveform generated thereby, and Figures 9 and 10 are the back electromotive voltage of the conventional coil. Fig. 11 is an actual measurement characteristic diagram of the magnetic field distribution of the electromagnetic part of the motor. FIG. 12 is a plan view showing the structure of the sheet coil of the stator coil of the present invention, FIG. 13 is a cross-sectional view showing an easy-to-reverse embodiment of the stator coil of the present invention, and FIG. An explanatory diagram of the torque generated by the motor using the stator coil of the invention,
FIGS. 21 and 22 are characteristic diagrams of torque versus rotation speed characteristics and torque versus current characteristics of a motor using the stator coil of the present invention. 11: Insulating sheet, 12: Spiral pattern conductor. 14 Varnish through-hole electrode. 50th 76th east branch, east opening, 10th q mouth"i B fL;LY2 t)E frt The Shoshi Wife of the Glue Electric 11 Yujikashari l (ynm) 躬／1 Maro Seiki ≦ β Tsuki no Masashi Hiyumi Coil / 111 M'J (Zen 4 Waguchi)?tz Zumoto Soto Akira = ) Kosei: Yumi Koitsumu J! Sec (Lζhuman hand face phrase 130 Honsushi Akira・Fixed-Japanese L's structure threat 'J(/zutsu-ni draft 4 grain light n)躬/411!1 #a!!] し■ ld a nose crime /'7 mouth coil 4th/1 and a half fL way IvI possible j u and makoi I'-
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Claims (1)

[Claims] 1. A plurality of magnetic poles having different polarities facing the magnetic pole faces of a rotor magnet arranged around its rotation axis, each having a plurality of coil poles. The coil poles of the coil pole group of the phase are spirally formed with patterned conductors on a plurality of different planes facing the magnetic pole surface of the rotor magnet and arranged in a direction sequentially moving away from the magnetic pole surface, In a stator coil having a configuration in which the value of the back electromotive force generated in the coil pole group of each phase is equal or approximately equal between the phases due to the magnetic flux from the magnetic pole surface of the rotor magnet when the child magnet rotates. , Coil poles of the same phase are divided into a plurality of planes including an opposing plane near the magnetic pole surface of the rotor magnet and an opposing plane far from the magnetic pole surface, and are concentric with the rotation axis of the rotor magnet. A plurality of coil poles are arranged in a plurality of coil poles, the poles are connected to each other, and at least a group of coil poles are arranged on opposing planes on the side closer to the magnetic pole face, and a group of coil poles are arranged on the opposing plane on the side farther from the magnetic pole face. a first coil pole group formed by connecting in series; a coil pole group forming a phase different from the first coil pole group, and the first coil pole group is arranged in a distributed manner; The rotation axis of the rotor magnet is divided into a plurality of planes including an opposing plane disposed on a side farther from the magnetic pole face of the rotor magnet and an opposing plane disposed on a side closer to the magnetic pole face of the rotor magnet than the plurality of opposing planes. A plurality of coil poles are arranged concentrically and the poles are connected to each other, and at least a group of coil poles arranged on the opposing plane on the far side and a group of coil poles arranged on the opposing plane on the near side are connected in series. a second coil pole group connected to;
A stator coil characterized by a configuration. 2. The second coil pole group has a configuration in which the number of turns of the spiral pattern conductor of the coil pole is equal to the number of turns of the spiral pattern conductor of the coil pole of the first coil pole group. A stator coil according to claim 1, comprising: a stator coil according to claim 1; 3. Both the first coil pole group and the second coil pole group have coil poles that are concentric with the rotation axis within a plurality of planes perpendicular to the rotation axis direction of the rotor magnet. The stator coil according to claim 1 or 2, having a configuration in which a plurality of stator coils are arranged in a row. 4. The second coil pole group includes at least a plurality of phases of coil pole groups, and each phase of the plurality of phase coil pole groups is divided from the first coil pole group. It is divided into a plurality of planes, an opposing plane arranged on a side farther from the magnetic pole face of the rotor magnet than the plurality of opposing planes arranged on the rotor magnet, and an opposing plane arranged on a side closer to the magnetic pole face of the rotor magnet. The stator coil according to claim 1, 2 or 3, wherein a plurality of stator coils are arranged concentrically with respect to the rotation axis of the rotor magnet and the poles are connected to each other. 5. The second coil pole group is a plurality of coil pole groups of the same phase stacked consecutively as upper and lower adjacent layers between the plurality of opposing planes on which the first coil pole groups are formed. A stator coil as claimed in claim 1, 2, 3 or 4, comprising an arrangement arranged on two opposing planes. 6. The first coil pole group and the second coil pole group each have a configuration in which a plurality of coil poles are divided and arranged on two planes, Claim 1 , 2, 3, 4 or 5.