JP2007236123A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can easily increase an output torque without enlargement of the size. <P>SOLUTION: This motor 1 has a magnet which is fixed to a shaft 3 and a stator 5 which is arranged to surround the magnet 3. The stator 5 has the first phase coil group 14 where the first flat air-core coils 15A-15H having air-gaps S at the centers are connected serially in plural numbers, and the second phase coil group 16 where the second flat air-gap coils 17 having air-gaps S at the centers are connected serially in plural numbers. For the first phase coil group 14 and the second phase coil group 16, the first air-core coils 15A-15H and the second air-core coils 17A-17H lie one upon another while being slid alternately in its circumferential direction. The first fellow adjacent air-core coils 15 line one upon another so that the directions of current application may be the same across the air-gap S of the second air-core coil 17. The second fellow adjacent air-core coils 17 lie one upon another so that the directions of current application may be the same across the air-gap S of the first air-core coil. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical device lens driving actuator, a disk storage device writing / reading head driving actuator, an optical and magnetic reading sensor, and a coreless motor used in various medical devices.

  Conventionally, as a technology in such a field, there is a PM type two-phase excitation stepping motor (see Patent Document 1). The stepping motor includes a rotor in which a magnet is fixed to a shaft, a stator in which a plurality of flat air-core coils configured to be divided into a first phase and a second phase are arranged along the outer peripheral surface of the magnet, Have When the air core coil is energized, a rotational force is generated in the air core coil according to Fleming's left-hand rule. Since the air-core coil is fixed, the rotor rotates by receiving the reaction force. The air-core coils of each phase are arranged 90 degrees apart in electrical angle, and the shaft continuously rotates in one direction by energizing the air-core coils of each phase with a voltage waveform that is 90 degrees out of phase. . In this stepping motor, since there is no magnetic yoke core in the stator, no detent torque is generated, and it is not affected by the detent torque during driving and stopping.

JP 2003-70223 A

  In the conventional stepping motor, it is necessary to arrange the air-core coils corresponding to the phase difference of the power supply voltage of each phase, and further, it is necessary to arrange them with a gap so that the air-core coils do not overlap each other. Due to such restrictions on the arrangement of the air-core coils, it has been difficult for the conventional stepping motor to increase the output torque by increasing the number of air-core coils. Further, if the number of turns of each air-core coil is increased, the air-core coil becomes thicker and the motor becomes larger. Therefore, it is difficult to increase the output torque by increasing the number of turns of each air-core coil.

  An object of this invention is to provide the motor which is easy to enlarge output torque, without enlarging a motor.

  A motor according to the present invention is a motor having a magnet fixed to a shaft and a stator arranged in an annular shape so as to surround the magnet, and the stator is a flat first air-core coil having a gap in the center. The first-phase coil group includes a plurality of first-phase coil groups connected in series, and a second phase-coil group in which a flat second air-core coil having a gap in the center is connected in series. The first air-core coil and the second air-coil coil overlap with each other while the first air-core coil and the second air-core coil are alternately shifted in the circumferential direction, and the adjacent first air-core coils are gap portions of the second air-core coil. The second air-core coils are overlapped so that the energization directions are the same, and the adjacent second air-core coils are overlapped so that the energization directions are the same across the gap of the first air-core coil. .

  In the motor according to the present invention, the air-core coils in the first-phase and second-phase coil groups overlap with each other while being displaced alternately in the circumferential direction of the shaft, so a stator using more air-core coils than the conventional motor is formed. Easy to do. Further, the adjacent first air-core coils are overlapped so that the energization directions are the same across the gap of the second air-core coil, and the adjacent second air-core coils are the gap of the first air-core coil. The gaps of the first and second air-core coils can be effectively utilized since the current-carrying directions are the same with the gap between them, and the first air-core coils and the second air-core coils can be effectively used. By superimposing them so that the energization directions are the same, it is possible to avoid canceling out the magnetic force between the first air core coils and the second air core coils, and to increase the output torque. As a result, the output torque can be increased without increasing the occupation area of the stator. When used as a stepping motor, an arbitrary shaft hold can be obtained by switching the combination of the number of first and second air-core coils and the number of poles of the magnet and energizing the first and second air-core coils with a predetermined time. Points can be created, allowing control of the shaft step angle.

  Further, the first air core coil and the second air core coil have the same shape curved with the same curvature, and the flat portion curved with the same curvature as the above curvature is formed in the gap of the first air core coil. It is preferable that a flat second spacer curved with the same curvature as that described above is fitted in the gap of the second air-core coil. In this case, the air gap between each air-core coil and the magnet can be reduced by overlapping each air-core coil with the inside of each curved air-core coil facing the shaft side, and the output torque can be reduced. It becomes easy to raise. Further, the first and second spacers are fitted into the gaps of the first and second air core coils, respectively, so that the first and second air core coils can be prevented from being deformed. And it becomes easy to firmly fix the 1st and 2nd air core coils firmly by piling up the 1st and 2nd air core coils of the same shape without shape loss. In particular, when the motor is small, preventing the first and second air-core coils from being deformed by the first and second spacers improves the ease of handling of the small first and second air-core coils and improves the stator. Assembling performance is improved.

  Further, the first spacer and the second spacer are respectively formed with a convex portion and a concave portion in the front and rear in the circumferential direction, and the convex portion of the first spacer is fitted into the concave portion of the adjacent second spacer, and the convex portion of the second spacer is formed. It is preferable that the portion is fitted into the concave portion of the adjacent first spacer, and the first air core coil and the second air core coil are alternately overlapped. In this case, of the first and second spacers, the first air core coil and the second air core coil overlap with each other because the convex portion of one spacer is fitted into the concave portion of the other spacer. . Therefore, it becomes easy to arrange | position the 1st and 2nd air-core coils which mutually overlap with the highly accurate angle difference according to the phase difference of an energization voltage. As a result, the rotation accuracy of the motor can be improved.

  In addition, the first unit coil portion in which the first spacer is fitted into the first air core coil and the second unit coil portion in which the second spacer is fitted into the second air core coil are mutually connected. It is preferable that it is adhered to. In this case, since the first unit coil portion and the second unit coil portion are fixed, the stator becomes more difficult to collapse, and the air gap between the magnet and the stator can be kept constant at all times. Torque can be further stabilized.

  According to the present invention, the output torque can be easily increased without increasing the size of the motor.

  Hereinafter, preferred embodiments of a motor according to the present invention will be described in detail with reference to the drawings.

[First embodiment]
As shown in FIGS. 1 and 2, the motor 1 is a small stepping motor, and has a cylindrical motor case 2 having a diameter of about 30 mm, a shaft 3 that extends through the motor case 2, and a shaft 3. And a ring-shaped stator coil 6 surrounding the magnet 4.

  The motor case 2 has a cylindrical housing portion 7 formed of a magnetic material. A front bracket 8 made of nonmagnetic metal is fixed to the opened front end of the housing part 7. A disc-shaped rear bracket 9 made of a nonmagnetic metal is fixed to the rear end of the housing portion 7. A radial bearing 11 is crimped on the front bracket 8, and a radial bearing 12 is crimped on the rear bracket 9. The shaft 3 extends through the front bracket 8 and the rear bracket 9 and is supported by radial bearings 11 and 12.

  The magnet 4 is an annular permanent magnet (see FIG. 3) having eight magnetic poles, and is fixed to the peripheral surface of the shaft 3 via a tubular spacer 13. The stator coil 6 is bonded to the inner peripheral surface of the housing portion 7 and is disposed along the rotational direction of the shaft 3 so as to surround the magnet 4. The stator 5 is configured by the cooperation of the stator coil 6 and the housing portion 7.

  As shown in FIG. 3, the stator coil 6 includes a first phase coil group 14 and a second phase coil group 16. As shown in FIG. 4, the first phase coil group 14 has the same number of first air-core coils 15 </ b> A to 15 </ b> H as the number of poles of the magnet 4. The first air-core coils 15A to 15H are connected in series, and the connection terminals 14a and 14b provided at both ends are soldered to a flexible substrate 18 (see FIG. 1) bonded to the rear bracket 9. Yes. The first spacers 19 (see FIG. 2) are fitted into the gaps S of the first air-core coils 15A to 15H, and the eight first air-core coils 15A to 15H and the eight first spacers 19 are used. Eight first unit coil portions 23 are configured. Similarly, as shown in FIG. 5, the second phase coil group 16 has the same number of second air-core coils 17 </ b> A to 17 </ b> H as the number of poles of the magnet 4. The second air core coils 17 </ b> A to 17 </ b> H are also connected in series, and the connection terminals 16 a and 16 b provided at both ends are soldered to the flexible substrate 18 bonded to the rear bracket 9. A second spacer 22 (see FIG. 2) is fitted in the gap S of each of the second air core coils 17A to 17H, and eight second air core coils 17A to 17H and the first spacer 19 are used to form eight second spacers. A unit coil unit 25 is configured.

  As shown in FIGS. 2 and 3, the first air core coils 15 </ b> A to 15 </ b> H of the first phase coil group 14 and the second air core coils 17 </ b> A to 17 </ b> H of the second phase coil group 16 are in the circumferential direction of the shaft 3. The magnets 4 are surrounded in an annular manner by alternately overlapping with each other. In the following description, the circumferential direction means a clockwise direction around the shaft 3 in the cross-sectional view of the motor 1 shown in FIG. 2, and the front and rear are defined based on this direction.

  As shown in FIGS. 6 to 9, the first air-core coil 15 </ b> A is formed by winding a self-bonding enamel wire flatly so as to form a substantially rectangular gap S at the center and applying heat to the first air-core coil 15 </ b> A. It is formed by bonding enameled wires together. The first air-core coil 15A is formed with a pair of long side portions 15a and a pair of short side portions 15b that are opposed to each other with the gap S therebetween. The dimension L1 of the long side portion 15A and the dimension L2 of the gap S in the circumferential direction of the shaft 3 are substantially the same. Further, the long side portion 15 a is straight so as to extend along the direction of the rotation axis C <b> 1 (see FIG. 1) of the shaft 3, and the short side portion 15 b has a constant curvature 1 so as to follow the circumferential direction of the magnet 4. Curved at / r. The other first air core coils 15B to 15H have the same shape as the first air core coil 15A. The second air core coils 17A to 17H have the same shape as the first air core coil 15A, and have a pair of long side portions 17a and a pair of short side portions 17b that face each other with the gap S therebetween. .

  A resin-made first spacer 19 is fitted into the gap S of the first air-core coil 15A. The first spacer 19 has substantially the same thickness as the first air-core coil 15A, has an elongated flat shape corresponding to the rectangular gap S, and is curved with a curvature of 1 / r. Both end portions 19a, 19b in the front-rear direction of the first spacer 19 are in contact with the inner peripheral surface of the long side portion 15a of the first air-core coil 15A. Further, a convex portion 19c protruding inward is formed at the front end portion 19a, and a notch groove (concave portion) 19d corresponding to the shape of the convex portion 19c is formed at the rear end portion 19b. Yes. On the other hand, there is a gap between the left and right ends 19e, 19f of the first spacer 19 and the short side 15b of the first air-core coil 15A, and the left and right ends 19e, 19f are connected to the short side 15b. It projects in a semicircular direction.

  The second spacer 20 is also fitted into the gap S between the second air-core coils 17A to 17H. The second spacer 20 has the same shape as the first spacer 19, and has a convex portion 20 c and a notch groove 20 d, as with the first spacer 19.

  As shown in FIGS. 2, 8 and 9, the first air core coil 15 </ b> A is superimposed on the upper surface of the second air core coil 17 </ b> B, and the convex portion 19 c of the first spacer 19 is notched groove 20 d of the second spacer 20. It is inserted in. Thereafter, the second air core coil 17B is overlaid on the upper surface of the first air core coil 15B, and the convex portion 20c of the second spacer 20 is inserted into the notch groove 19d of the first spacer 19. In this way, the first empty space 19c and the notched groove 20d of the second spacer 20 and the notched groove 20d of the second spacer 20 and the notched groove 19d of the first spacer 19 are fitted together. The core coils 15A to 15H and the second air core coils 17A to 17H are alternately overlapped, and the annular stator coil 6 is formed. An adhesive is applied to the surface of the stator coil 6, and after finishing with an insulating varnish, the stator coil 6 is bonded to the inner peripheral surface of the housing portion 7.

  As shown in FIGS. 3 to 5 and 10, in the stator coil 6, the long side portions 15 a of the adjacent first air core coil 15 </ b> A and the first air core coil 15 </ b> B are the same as those of the second air core coil 17 </ b> A. The overlapping long side portions 15a are connected so that the energization directions are the same. Similarly, the long side portions 15a of all the adjacent first air core coils 15A to 15H overlap with each other so as to sandwich the gap S between the second air core coils 17A to 17H, and the long side portions 15a that overlap each other. Are connected so that the energization directions are the same.

  Similarly, the long side portions 17a of all the adjacent second air core coils 17A to 17H are overlapped so as to sandwich the gap portion S of the first air core coils 15A to 15H, and the long side portions 17a that overlap each other. Are connected so that the energization directions are the same.

  As shown in FIG. 3, the motor 1 has a magnet 4 with the number of poles “8”, and the stator coil 6 has the same number of first air-core coils 15 </ b> A to 15 </ b> H as the number of poles of the magnet 4 and the magnet 4. The same number of second air core coils 17A to 17H as the number of poles are provided. The first air-core coils 15A to 15H and the second air-core coils 17A to 17H overlap each other while being shifted by 22.5 degrees alternately in the circumferential direction of the shaft 3. The second phase coil group 16 will be described as a shift in the circumferential direction of the shaft 3 with respect to the phase coil group 14. Note that the deviation of 22.5 degrees corresponds to a phase difference of 90 degrees in electrical angle when the 8-pole magnet 4 is used.

  An energization method for rotating the shaft 3 in the motor 1 will be described. As shown in FIG. 11A, the energization direction is illustrated with respect to the long side portion 15a of the first air core coils 15B and 15C and the long side portion 17a of the second air core coils 17C and 17D facing the N pole. A constant current is applied from the back in 11 (a). In addition, the energization direction of the long side portion 15a of the first air core coils 15C and 15D and the long side portion 17a of the second air core coils 17D and 17E facing the south pole is from the front to the back in FIG. Such a current flows. The magnetic field lines B generated from the N pole of the magnet 4 pass through the stator coil 6 and the housing portion 7, and then return to the adjacent S pole through the stator coil 6 again. A magnetic force acts in the counterclockwise direction on the first phase and second phase coil groups 14 and 16 of the stator coil 6 according to the Fleming left-hand rule. Since the stator coil 6 is fixed to the housing part 7, a magnetic reaction force acts on the magnet 4 in the clockwise direction, and the shaft 3 rotates in the clockwise direction.

  When the magnet 4 rotates by the amount of deviation of the second phase coil group 16 with respect to the first phase coil group 14, this time, as shown in FIG. 11B, the first air core coils 15A to 15H and the second air core coil The magnetic force that cancels each other acts on 17A to 17H, the magnetic reaction force acting on the magnet 4 is also canceled, and the shaft 3 stops at that position. In this case, if the direction of energization to the second phase coil group 16 is not switched, a holding force acts on the magnet 4. When the energization to the second phase coil group 16 is switched and the energization direction is reversed, as shown in FIG. 11C, a magnetic reaction force acts on the magnet 4 in the clockwise direction so that the shaft 3 rotates in the clockwise direction. Continue to rotate. The deviation between the first phase coil group 14 and the second phase coil group 16 is 22.5 degrees, and the motor 1 has a step angle of 22.5 degrees. The number and position of the holding points of the shaft 3 can be changed by changing the timing of switching energization to the first phase coil group 14 and the second phase coil group 16.

  As described above, in the motor 1, the air-core coils 15 </ b> A to 15 </ b> H and 17 </ b> A to 17 </ b> H in the first phase coil group 14 and the second phase coil group 16 overlap with each other while being alternately shifted in the circumferential direction of the shaft 8. It is easier to form the stator 5 using more air-core coils than a conventional motor (see Patent Document 1). Further, the long side portions 15a of the adjacent first air-core coils 15A to 15H are overlapped so that the energization directions are the same across the gap S of the second air-core coils 17A to 17H, and the adjacent second air-core coils 15A to 15H are adjacent to each other. Since the long side portions 17a of the core coils 17A to 17H overlap with each other so that the energization directions are the same across the gap portion S of the first air core coil, the gap portion S can be effectively used, and the first It is possible to avoid magnetic force cancellation between the first air-core coils 15A to 15H and between the second air-core coils 17A to 17H and to increase the output torque. As a result, the output torque can be increased without increasing the occupation area of the stator 5.

  The air-core coils 15A to 15H and 17A to 17H have the same shape curved with the same curvature 1 / r, and each gap portion S has a flat first spacer 19 curved with the curvature 1 / r. The second spacer 20 is fitted. And each air core coil 15A-15H, 17A-17H is piled up in the state which turned the inner side of each curved air core coil 15A-15H, 17A-17H to the shaft 3 side, and the coil stator 6 and the magnet 4 are overlapped. The air gap between them can be reduced, and the output torque can be easily increased. Furthermore, by fitting the first and second spacers 19 and 20 into the gap S, it is possible to prevent the air core coils 15A to 15H and 17A to 17H from being out of shape. And it becomes easy to firmly fix each air-core coil 15A-15H and 17A-17H firmly by superimposing each air-core coil 15A-15H, 17A-17H of the same shape without shape loss. In particular, the motor 1 is a small stepping motor, and the first and second spacers 19 and 20 prevent the air core coils 15A to 15H and 17A to 17H from being out of shape. The small air core coils 15A to 15H, The handleability of 17A to 17H is improved, and the assemblability of the stator 5 is improved.

  Further, the first and second spacers 19 and 20 are respectively formed with protrusions 19c and 20c and notch grooves 19d and 20d in the circumferential direction of the shaft 3, and the protrusions 19c and 20c and the notch grooves 19d and 20d. And the air core coils 15A to 15H and 17A to 17H are positioned. Therefore, it becomes easy to arrange the first and second air-core coils 15A to 15H and 17A to 17H overlapping each other with a highly accurate angle difference according to the phase difference of the energized voltage. As a result, the rotation accuracy of the motor 1 can be improved.

[Second Embodiment]
The second embodiment of the motor according to the present invention differs from the first embodiment shown in FIGS. 1 to 11 in the first and second unit coil portions 30 and 31. Therefore, the first and second unit coil sections 30 and 31 will be mainly described, and the other components are denoted by the same reference numerals as those of the first embodiment, and the description thereof is omitted.

  As shown in FIGS. 12 to 14, the first air-core coil 32 is flat and has a pair of long side portions 32 a and a pair of short side portions 32 b that are opposed to each other with the substantially rectangular gap portion S interposed therebetween. The short side portion 32b is curved with a constant curvature 1 / r. And the dimension of the space | gap part S and the long side part 32a in the circumferential direction of the shaft 3 is substantially the same. A resin-made first spacer 33 is fitted into the gap S of the first air-core coil 32. The first spacer 33 has an elongated flat shape corresponding to the gap S and is curved with a curvature of 1 / r. The front and rear end portions 33 a and 33 b in the circumferential direction of the shaft 3 in the first spacer 33 abut on the inner peripheral surface of the long side portion 32 a in the first air-core coil 32. On the other hand, there is a slight gap between the left and right end portions 33c and 33d of the first spacer 33 and the short side portion 32b of the first air-core coil 32, and the left and right end portions 33c and 33 d protrudes in a semicircular shape toward the short side portion 32 b of the first air-core coil 32. The other first air-core coil 32 has the same shape. The second air-core coil 34 has the same shape as the first air-core coil 32, and has a pair of long side portions 34a and a pair of short side portions 34b that face each other with the gap S therebetween. The first spacer 33 is fitted in the gap S of the first air core coil 32 to form the first unit coil portion 30, and the second spacer 35 is fitted in the gap S of the second air core coil 34. Two unit coil portions 31 are formed.

  The first unit coil portion 30 and the second unit coil portion 31 overlap each other with a shift of 22.5 degrees in the circumferential direction of the shaft 3, and are bonded to each other by a double-sided tape 36. The upper surface 36 a of the double-sided tape 36 is affixed across the first spacer 33 and the long side portion 32 a of the first air core coil 32, and the lower surface 36 b of the double-sided tape is the long side portion 34 a of the second air core coil 34. And the second spacer 35. Further, the upper surface 37 a of the other double-sided tape 37 is pasted across the second spacer 35 and the long side portion 34 a of the second air-core coil 34.

  Recesses 33a and 33b having a depth corresponding to the thickness of the double-sided tapes 36 and 37 are formed on the upper and lower surfaces of the first spacer 33. Similar recesses 35a and 35b are formed on the upper and lower surfaces of the second spacer 35. Is formed. The double-sided tapes 36 and 37 are accommodated in the recesses 33a, 33b, 35a, and 35b, so that no gap is generated between the first unit coil portion 30 and the second unit coil portion 31. Further, the depressions 33 b and 35 b formed on the lower surfaces of the first and second spacers 33 and 35 become shallow on the front side in the circumferential direction of the shaft 3, and the depressions 33 a and 35 b formed on the upper surface are in the circumferential direction of the shaft 3. Shallow on the back side. When the first unit coil portion 30 and the second unit coil portion 31 are alternately shifted and overlapped, the first and second spacers 33 and 35 partially overlap each other, and the first spacer 33 is depressed at that location. 33a, 33b and the recesses 35a, 35b of the second spacer 35 are smoothly connected. As a result, the double-sided tapes 36 and 37 are gently curved and are in close contact with the first and second spacers 33 and 35 without any gaps, making it easy to firmly fix the first and second spacers 33 and 35 to each other. .

  In the second embodiment according to the present invention, the first unit coil portion 30 and the second unit coil portion 31 are bonded to each other by double-sided tapes 36 and 37. In this case, the first unit coil portions 30 and the second unit coil portions 31 are alternately overlapped and fixed at the same time, and therefore, are less likely to collapse when the stator 5 is transported and bonded to the housing portion 7. Thus, since the air gap between the magnet 4 and the stator 5 can be kept constant at all times, the output torque can be further stabilized. In particular, since the double-sided tapes 36 and 37 are used for bonding, it is easy to handle and the assemblability is good.

  In addition, this invention is not limited to the above embodiment, You may apply to an induction motor. In addition, magnets having 6 poles, 12 poles, or other even poles can be used, and the number of first air core coils and second air core coils is determined according to the number of magnet poles. You can also.

It is sectional drawing which shows 1st Embodiment of the motor which concerns on this invention. It is sectional drawing along the II-II line of FIG. It is a figure which shows arrangement | positioning of the 1st phase coil group and 2nd phase coil group with respect to a magnet. The 1st phase coil group is shown, (a) is a figure showing arrangement of the 1st air core coil, and (b) is a figure showing the connection relation of each 1st air core coil. The 2nd phase coil group is shown, (a) is a figure showing arrangement of the 2nd air core coil, and (b) is a figure showing the connection relation of each 2nd air core coil. It is a disassembled perspective view of a 1st unit coil part. It is a top view of the 1st unit coil part. It is a top view which shows the state which connected the 2nd unit coil part to the 1st unit coil part. It is sectional drawing along the IX-IX line of FIG. It is a figure which shows the electricity supply direction at the time of performing predetermined electricity supply to a 1st phase coil group and a 2nd phase coil group. The electromagnetic force acting on the first air core coil and the second air core coil and the magnetic reaction force acting on the magnet when a predetermined energization is applied to the first phase coil group and the second phase coil group are shown. (c) is a diagram showing the time of rotation, (b) is a diagram showing the time of holding. It is a top view which shows the 1st unit coil part which concerns on 2nd Embodiment. It is a top view which shows the state which connected the 2nd unit coil part to the 1st unit coil part. It is sectional drawing along the XIV-XIV line | wire of FIG. It is a perspective view which fractures | ruptures and shows the state which connected the 2nd unit coil part to the 1st unit coil part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor, 3 ... Shaft, 4 ... Magnet, 5 ... Stator, 6 ... Stator coil, 7 ... Housing part, 14 ... 1st phase coil group, 15A-15H ... 1st air core coil, 16 ... 2nd phase coil Group, 17A to 17H: second air core coil, 19: first spacer, 19c: convex portion, 19d ... notched groove, 20 ... second spacer, 20c ... convex portion, 20d ... notched groove, 23, 30 ... first Unit coil part, 25, 31 ... second unit coil part, S ... gap part, 1 / r ... curvature.

Claims (4)

A motor having a magnet fixed to a shaft and a stator arranged in an annular shape so as to surround the magnet,
The stator is
A first phase coil group in which a plurality of flat first air-core coils having a gap in the center are connected in series;
A flat second air-core coil having a gap in the center has a second phase coil group connected in series,
The first phase coil group and the second phase coil group are overlapped while the first air core coil and the second air core coil are alternately shifted in the circumferential direction,
The adjacent first air-core coils are overlapped so that the energization directions are the same across the gap portion of the second air-core coil,
The adjacent second air-core coils overlap with each other such that energization directions are the same across the gap portion of the first air-core coil.   The first air core coil and the second air core coil have the same shape curved with the same curvature, and the gap portion of the first air core coil is curved with the same curvature as the curvature. The motor according to claim 1, wherein a flat first spacer is fitted, and a flat second spacer curved with the same curvature as the curvature is fitted in the gap of the second air-core coil.   The first spacer and the second spacer are respectively formed with a convex portion and a concave portion in the circumferential direction, and the convex portion of the first spacer is fitted into the concave portion of the adjacent second spacer, The said convex part of a 2nd spacer is engage | inserted by the said recessed part of the said 1st spacer which adjoins, The said 1st air core coil and the said 2nd air core coil overlap alternately. motor. What is a first unit coil part in which the first spacer is fitted in the first air core coil, and a second unit coil part in which the second spacer is fitted in the second air core coil? The motor according to claim 2, wherein the motors are bonded to each other.

Images