JP5010903B2 - Motor and fan using the same - Google Patents

Description

  The present invention relates to a technique for providing a motor and a fan using the motor.

Motors are widely used in various fields. One form of motor is a motor having claw-shaped magnetic poles. For example, as shown in Patent Document 1, the stator for one phase of the motor includes a circular coil for passing current, a pair of claw-shaped magnetic poles, and the claw-shaped magnetic path surrounding the coil. And a magnetic body that forms a magnetic path.
In the case of a three-phase motor, a stator can be formed by using three sets. When a three-phase voltage is applied to the three sets of stators, rotational torque is generated in the rotor with the permanent magnets fixed, and the rotor can be rotated. Compared with the conventional motor, this motor has a feature that it has no coil end and can be miniaturized. Patent Document 2 describes a claw-type magnetic pole motor in which a set of coils is arranged on a single plane perpendicular to a rotation axis.

  On the other hand, a counter-rotating fan having two rotating blades and having different rotational directions is excellent as an axial flow fan with a large air volume, high pressure and low noise.

  Moreover, as shown in Patent Document 3, a motor that drives the same number of rotors with a plurality of sets of windings has been proposed. Further, Patent Document 4 proposes a motor that drives currents of a plurality of frequencies through a set of windings to drive two rotors.

Japanese Patent Laid-Open No. 2001-161054 Special Table 2003-513599 Japanese Patent Laid-Open No. 10-42600 Japanese Patent Laid-Open No. 11-275826

  Thus, when there are two rotor blades, it is usually necessary to drive by two motors, and the fan housing tends to be large. Therefore, although this counter rotating fan has excellent characteristics, there is a problem that it is difficult to apply to a fan device that requires a reduction in thickness.

  In addition, as described above, motors having a plurality of rotors have been proposed, but all of them have a stator shape with slot teeth, and have a coil end of a winding, so that there is a limit to thinning. was there.

  In either case, there was a problem in thinning the fan system with high pressure and low noise, and there was no motor suitable for it.

  In order to solve the above problems, the following measures are taken.

  A pair of stators having first and second rotors that rotate about a rotation axis, a columnar core portion into which a plurality of coils arranged on the same plane centering on the rotation axis are inserted, and claw-shaped teeth A motor including a stator that forms a core so as to face each other, wherein the claw-shaped teeth include a first claw-shaped tooth group disposed on an inner peripheral side of the stator, and an outer peripheral side of the stator And the first rotor is driven by the first claw-shaped teeth group, and the second rotor is driven by the second claw-shaped teeth group. The configuration is as follows. An alternating current having a predetermined phase is passed through the plurality of coils. Hereinafter, the coil in such a state is referred to as a set of coils. For example, it is known that normally one rotating magnetic field can be generated by flowing an alternating current having a phase difference of 120 ° through three coils.

  In addition, to describe the above as another configuration, a first rotor that rotates about a rotation axis, and a second rotor that is provided outside the first rotor and rotates about the rotation axis. And a stator provided on the outer peripheral side of the first rotor and provided on the inner peripheral side of the second rotor, the stator core that constitutes the stator includes the first core A first claw-shaped tooth having a plurality of magnetic pole faces facing the rotor with a gap and extending in the direction of the rotation axis, and an annular radial joint extending from the first claw-shaped tooth in the outer radial direction An iron part, and a second claw-shaped tooth having a plurality of magnetic pole faces extending in the direction of the rotation axis from the radial yoke part and having a magnetic pole face facing the second rotor with a gap. Formed, the stator core is paired with each other, and a plurality of coils are sandwiched therebetween. A stator is formed, and the annular radial yoke portion includes a plurality of columnar columnar cores on which the coils are disposed, and magnetic flux generated in the coils disposed on the plurality of columnar cores is the first The first rotor is rotated by reaching from the claw-shaped teeth to the first rotor, and the magnetic flux generated in the coils of the plurality of columnar cores is transferred from the second claw-shaped teeth to the second rotation. The second rotor is rotated by reaching the child.

  By adopting the above configuration, when an alternating voltage having a predetermined phase difference is applied to a set of coils, an alternating current is generated in these coils. A rotating magnetic field generated in the first claw-shaped teeth group and a rotating magnetic field generated in the second claw-shaped teeth group by configuring the first and second claw-shaped teeth groups in different arrangements and phase difference relationships. Can be designed in different directions or at different motor speeds.

  According to the above configuration, since the two rotors can be rotated in the same rotational direction or the reverse direction by one thin motor, a high-performance thin fan system and a motor suitable therefor can be provided.

  According to the present invention, it is possible to provide a motor and fan system with higher performance than before.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an embodiment of a three-phase motor having two rotors characteristic of the present invention. The first rotor 10, the second rotor 20, and the stator 30 constituting the motor are disassembled. FIG. The first rotor 10 has a structure that rotates outside the stator 30 with respect to the rotation axis, a first rotating member 11 that drives a first fan, which will be described later, and a cylindrical shape that is attached to the inside of the first rotating member 11 to generate a magnetic flux. The first magnet 12 is configured. Similarly, the second rotor 20 includes a second rotating member 21 and a cylindrical second magnet 22 that is disposed outside the second rotating member 21 and generates a magnetic flux, and has a structure that rotates inside the stator 30. Two fans are driven. Both the first rotor 10 and the second rotor 20 rotate around the straight line A-A ′ in FIG. In this embodiment, the number of poles of the first magnet 12 and the second magnet 22 are both 16 poles.

  The stator 30 is roughly composed of a coil 32 for passing a current to the motor, and stator cores 31 and 33 for forming a magnetic path of a magnetic flux generated by the current of the coil 32. The stator core 33 includes first claw-shaped teeth UN1, VN1, WN1 facing the first rotor 10, second claw-shaped teeth UN2, VN2, WN2 facing the second rotor 20, and a part of the magnetic path. The columnar cores U03, V03, and W03 are formed. The stator core 31 also has the same shape as the stator core 33, and is composed of first claw-shaped teeth UP1, VP1, WP1, second claw-shaped teeth UP2, VP2, WP2, and columnar cores U01, V01, W01. Is done. The stator cores 31 and 33 face each other so as to sandwich the respective claw-shaped teeth, and the coil 32U is arranged in a structure surrounding the columnar cores U01 and U03. Similarly, the coils 32V and 32W are also arranged so as to surround the columnar cores V01 and V03 and the columnar cores W01 and W03, respectively.

  When these parts are assembled with the straight line B-B ′ in FIG. 1 as the central axis, the stator 30 is formed. By inserting a stator 30 assembled with the straight line BB ′ as the central axis into the first rotor 10 and the second rotor 20 assembled with the straight line AA ′ of FIG. 1 as the central axis, FIG. A three-phase motor having the two rotors 10, 20 shown can be constructed.

  FIG. 3 shows a fan device equipped with this motor. A motor stator 30 is attached to a motor fixing member 42 fixed to the fan frame 41. A first fan 44 is attached to the first rotor 10 and rotates together with the first rotor 10. The second fan 45 is connected to the second rotor 20 and rotates together with the second rotor 20. When the first fan 44 rotates in the clockwise direction and the second fan 45 rotates in the counterclockwise direction, fluid such as air flows from the upper part to the lower part in FIG. A filter 43 for removing fluid dust, dust and the like is attached to the lower part of the fan device. In the motor mounted in this embodiment, when a three-phase alternating current having different phases is applied to the coils 32U, 32V, and 32W by 120 °, when the first rotor 10 rotates in the clockwise direction, the second rotor 20 has the same speed. It is configured to rotate counterclockwise.

  The principle of the motor shown in FIG. 2, which is a feature of the embodiment of the present invention, that is, the principle that the first rotor 10 rotates forward and the second rotor 20 rotates reversely will be described. 4 is a cross-sectional view of the motor shown in FIG. 2 when viewed from the front and side. The front sectional view of FIG. 4 is cut at the central portion in the axial direction of the motor, and shows that the number of poles of the first magnet 12 and the second magnet 22 are both 16. Further, the total number of first claw-shaped teeth (hereinafter referred to as a first claw-shaped tooth group) that drives the first rotor, and the total number of second claw-shaped teeth (hereinafter referred to as the second claw-shaped teeth) that drive the second rotor. Each group is 12). Note that the number of first claw-shaped tooth groups and second claw-shaped tooth groups per phase is four. Here, a front view of the stator core 33 is shown in FIG. Focusing on the positional relationship between the columnar core of each phase and the claw-shaped tooth group, the first claw-shaped tooth group is in a fixed positional relationship, whereas the position of the second claw-shaped tooth group and the columnar core. It can be seen that the relationship is different for each phase. The details will be described with reference to FIG. FIG. 6 shows the first magnet 12 of the first rotor 10, the second magnet 22 of the second rotor 20, the first claw-shaped teeth group, the second claw-shaped teeth group of the stator 30 with the horizontal axis as the rotation angle. This shows the arrangement relationship.

  In FIG. 6, the arrangement of the claw-shaped teeth of the stator will be described. A coil 32U is arranged between a mechanical angle of −7.5 ° and 120 °, and an alternating magnetic flux is generated in the first claw-shaped teeth UP1, UN1 and the second claw-shaped teeth UP2, UN2 by flowing a U-phase current. appear. With respect to the U phase, the first claw-shaped teeth are arranged every 22.5 ° in mechanical angle in the order of UP1, UN1, UP1, UN1. Similarly, the second claw-shaped teeth are arranged in the order of UN2, UP2, UN2, UP2 every 22.5 ° in mechanical angle. In FIG. 6, UP2 is shifted to the right by 15 ° mechanical angle with respect to UP1. Moreover, UN2 is arrange | positioned 30 degree left in mechanical angle with respect to UN1.

  Between the mechanical angles of 120 ° and 240 °, the coil 32W is arranged, and the W-phase current flows. appear. As for the W-phase claw-shaped teeth, the first claw-shaped teeth are in the order of WP1, WN1, WP1, and WN1, and the second claw-shaped teeth are in the order of WP2, WN2, WP2, and WN2, and the mechanical angles are each 22.5 °. It is the same arrangement.

  When the mechanical angle is between 240 ° and 352.5 °, alternating magnetic flux is generated in the first claw-shaped teeth VP1 and VN1 and the second claw-shaped teeth VP2 and VN2 due to the V-phase current flowing in the coil 32V. Regarding the V phase, the first claw-shaped teeth are arranged in the order of VP1, VN1, VP1, and VN1, and the second claw-shaped teeth are arranged in the order of VN2, VP2, VN2, and VP2 at a mechanical angle of 22.5 °. Yes. Further, VP2 is shifted to the right by a mechanical angle of 30 ° with respect to VP1. Further, VN2 is arranged at a mechanical angle of 15 ° to the left of VN1.

  Summarizing the mechanical arrangement of the claw-shaped teeth as described above, the teeth of each phase are arranged at a pitch of a mechanical angle of 22.5 ° in the first claw-shaped teeth group and the second claw-shaped teeth group. About the 1st nail | claw-shaped teeth group, each phase has the space | interval of 30 degrees of mechanical angles. Regarding the second claw-shaped teeth group, the U-W phase has a mechanical angle of 37.5 °, the W-V phase has a mechanical angle of 37.5 °, and the V-U phase has a mechanical angle of 15 °. . In FIG. 6, claw-shaped teeth UN2 and VP2 indicated by broken lines can be used in place of UN2 at the leftmost part of the drawing and VP2 at the rightmost part of the drawing, respectively. Can be obtained.

  Next, the relationship between the first claw tooth group of each phase and the first rotor will be described. The number of magnetic poles of the first rotor 10 is 16, and a mechanical angle of 45 ° corresponds to an electrical angle of 360 °. When the relationship between the U-phase first claw-shaped teeth UP1 and the magnetic pole N (the left end of N1) of the first rotor 10 is assumed to be 0 °, the electrical angle minus the V-phase first claw-shaped teeth VP1. There is a magnetic pole N (the left end of N11) at a position of 120 °. Further, a magnetic pole N (the left end of N5) is arranged at an electrical angle of 120 ° (−240 °) with respect to the W-phase first claw-shaped tooth WP1. When a three-phase current is passed through the coils 32U, 32V, and 32W in the phase order of U, V, and W, the rotating magnetic field is clockwise, so the first rotor 10 is rotated clockwise. The rotation speed is 1/8 of the frequency of the three-phase current.

  On the other hand, regarding the relationship between the second claw-shaped teeth group of each phase and the second rotor, the number of magnetic poles of the second rotor 20 is 16, and a mechanical angle of 45 ° corresponds to an electrical angle of 360 °. Therefore, when the relationship between the U-phase second claw-shaped teeth UP2 and the magnetic pole N (the left end of N18) of the second rotor 20 is 60 ° (−300 °), the V-phase second claw-shaped teeth VP2 Thus, the magnetic pole N (the left end of N28) is located at an electrical angle of -180 °. Further, the magnetic pole N (the left end of N22) is disposed at an electrical angle of −60 ° with respect to the W-phase second claw-shaped tooth WP2. When a three-phase current is passed through the coils 32U, 32V, and 32W in the phase order of U, V, and W, a rotating magnetic field is generated counterclockwise on the surface facing the second rotor 20, so that the second The rotor rotates counterclockwise. The rotation speed of the second rotor is 1/8 of the frequency of the three-phase current and is the same speed as the first rotor. Since the stator core has a complicated shape, it is not suitable for a method of manufacturing a motor configured by punching and stacking silicon steel plates. Therefore, a method in which the stator core of this embodiment is manufactured by compression molding a magnetic powder body is suitable.

  Accordingly, since the first rotor 10 and the second rotor 20 operate in synchronization with the frequency of the current flowing through the coils 32U, 32V, and 32W, the motors rotating in different directions at the same speed are configured according to this embodiment. can do. Furthermore, by applying this motor to the fan of FIG. 3, a flat double reversing fan can be realized. As described above, the claw-shaped teeth UN2 and VP2 indicated by the broken line in FIG. 6 can be realized. However, in order to reduce the vibration applied to the bearing, the motor having the configuration indicated by the solid line is superior. Yes.

  FIG. 7 is an example of a motor having two rotors having a configuration different from that shown in FIG. 2, that is, the motor shown in FIG. 4, and is a sectional view of the motor as seen from the front and side. The feature of this embodiment is that the two rotors rotate in different directions, and the rotational speeds thereof are different. This motor is composed of a pair of stator cores 34, 36 having the same shape and coils 35U, 35V, 35W, 35R, 35S, 35T. The pair of stator cores 34, 36 includes The first claw-shaped tooth group on the outer peripheral portion, the second claw-shaped tooth group on the inner peripheral portion, and the columnar core portion form a magnetic path through which the magnetic flux passes. FIG. 8 shows a front view of the stator core 36. In FIG. 8, the first claw-shaped tooth group is UN1, VN1, WN1, RN1, SN1, TN1, the second claw-shaped tooth group is UN2, VN2, WN2, RN2, SN2, TN2, and the columnar core portion is U0, V0, W0, R0, S0, and T0. The coils 35U, 35V, 35W, 35R, 35S, and 35T are arranged so as to surround the columnar core portions U0, V0, W0, R0, S0, and T0, and the teeth of the stator core 34 are mutually connected to the teeth of the stator core 36. The stator of FIG. 7 is configured by facing the position to be interpolated. In FIG. 7, a first rotor 10 composed of a first rotating member 11 and a first magnet 13 having 28 poles is arranged on the outer periphery of the first claw-shaped tooth group, and the first claw-shaped teeth are arranged. It is rotated by the rotating magnetic field of the group. Similarly, the 2nd rotor 20 comprised from the 2nd rotary member 21 and the 2nd magnet 23 of 14 poles is arrange | positioned in the inner peripheral part of a 2nd nail | claw-shaped teeth group, and a 2nd nail | claw-shaped teeth group It can be driven by the magnetic field. An external view of the stator core 36 of FIG. 8 is shown in FIG. The stator core 36 is characterized by six columnar cores, two first teeth per columnar core, one second tooth, and adjacent second teeth corresponding to the columnar cores. The three points are that the electrical angle is 180 ° (mechanical angle 25.71 °) different from each other.

  Next, the principle that the rotor of FIG. 7 rotates at different speeds in different directions will be described with reference to FIG. FIG. 10 shows the first magnet 13 of the first rotor 10, the second magnet 23 of the second rotor 20, the first claw-shaped teeth group of the stator 30, The arrangement | positioning relationship of 2 nail | claw-shaped teeth group is shown. The teeth of the stator core 34 are not described. However, like the stator core 36, UP1, VP1, WP1, RP1, SP1, and TP1 are the first claw-shaped teeth group, UP2, VP2, WP2, and RP2. , SP2 and TP2 are a second claw-shaped tooth group. In this embodiment, all coils are wound in the same direction, a U-phase current is passed through the coils 32U and 32R, a V-phase current is passed through the coils 32V and 32S, and a W-phase current is passed through the coils 32W and 32T.

  The relationship between the first claw tooth group and the first rotor will be described. Since the first rotor has 28 poles, the mechanical angle per pole is 12.86 ° (360 ° / 28), and the electrical angle is naturally 180 °. Further, since the pitch of the claw-shaped teeth is the same as that of the magnetic pole, the mechanical angle is 12.86 ° and the electrical angle is 180 °. The electrical angle between the columnar cores is 120 ° (mechanical angle 8.57 °). Since the same U-phase current flows through the coils 32U and 32R, the first claw-shaped teeth UP1, UN1, RP1, and RN1 generate magnetic flux depending on the magnitude of the U-phase current. Here, these teeth are called U-phase first nail-shaped teeth. When the relationship between the first claw-shaped teeth UP1 of the U phase and the magnetic pole N (left end of N1) of the first rotor 10 is regarded as an electrical angle of 0 °, it is natural that RP1 also has the magnetic pole N (N15 The relationship (left end) is 0 °, and the same action, that is, torque is generated with respect to the first rotor 10. On the other hand, the magnetic pole N (the left end of N19 and N5) is located at an electrical angle of −120 ° with respect to the V-phase first claw-shaped teeth VP1 and SP1 through which the V-phase current flows. A magnetic pole N (the left end of N11 and N25) is disposed at an electrical angle of 120 ° with respect to the W-phase first claw-shaped teeth WP1 and TP1. For this reason, when the above-described three-phase current is passed through the coils 32U, 32V, 32W, 32R, 32S, and 32T, the rotating magnetic field becomes clockwise, so the first rotor 10 is driven clockwise. The rotation speed is 1/14 of the frequency of the three-phase current.

  The relationship between the second claw tooth group and the second rotor will be described. The number of magnetic poles of the second rotor 20 is 14, and the total number of second claw-shaped teeth is as small as 12. In this case, the mechanical angle per pole is 25.71 ° (360 ° / 14), the electrical angle is 180 °, and the pitch of the claw-shaped teeth is the same. The interval between the columnar cores is the same mechanical angle of 8.57 ° as that of the first claw-shaped teeth. However, since the number of poles of the second rotor is 14 and 1/2 of the first rotor, the electrical angle is 60. °. Considering the relationship between the U-phase second claw-shaped teeth UP2 and the magnetic pole N of the second rotor 20 (the left end of N29) as 0 °, the U-phase second claw-shaped teeth RP2 and the magnetic pole N of the second rotor 20 (Left end of N37) is also 0 °. The magnetic pole N (the left end of N39 and N33) is located at an electrical angle of 120 ° with respect to the V-phase second claw-shaped teeth VP2 and SP2. A magnetic pole N (the left end of N33 and N41) is disposed at an electrical angle of −120 ° with respect to the W-phase second claw-shaped teeth WP2 and TP2. As described above, when a U-phase current is supplied to the coils 32U and 32R, a V-phase current is supplied to the coils 32V and 32S, a W-phase current is supplied to the coils 32W and 32T, and a three-phase current is supplied in the order of U, V, and W. Since the rotating magnetic field is generated counterclockwise on the surface facing the second rotor 10, the second rotor rotates counterclockwise.

  If this embodiment is used, there is a feature that the two rotors can be rotated in different directions and the speed of the second rotor 20 can be rotated at twice the speed of the first rotor 10. Thus, a double-rotating fan that can rotate at different wind speeds can be realized by a thin motor. Needless to say, when the fluid is supplied to the fan device in a predetermined direction, the direction of the blades of the fan device and the direction of rotation of the rotor of the motor are taken into consideration. Moreover, since the vibration accompanying rotation can be further reduced by using six columnar cores, this embodiment is suitable for a fan device that requires quietness.

  FIG. 11 shows an embodiment in which the thickness is further reduced as compared with the fan device of FIG. The second fan 47 is built in the motor by increasing the inner diameter of the rotor 20 disposed inside the stator 30 of the motor attached to the motor fixing member 42. A first fan 46 is mounted on the same plane of the first rotor 10 disposed on the outer peripheral side of the stator 30, and rotates integrally with the first rotor 10. As an example of the motor applied to the embodiment of FIG. 11, a motor having the configuration shown in FIG. 12 can be considered. In FIG. 12, the first magnet 14 of the first rotor 10 has 14 poles, and the second magnet 24 of the second rotor 20 has 8 poles. Further, in the stator cores 37 and 38, the total number of teeth of the first claw-shaped tooth group and the second claw-shaped tooth group is 12 and 6, respectively. Here, an external view of the stator core 38 is shown in FIG. When a three-phase current is passed through the coils 32U, 32V, and 32W in the phase sequence of U, V, and W with respect to the stator having such a structure, the first rotation is performed in the same manner as the principle described in FIGS. The child 10 rotates counterclockwise. The rotation frequency is 1/7 of the frequency of the three-phase current. The second rotor 20 also rotates counterclockwise at a rotation speed of 1/4 of the frequency of the three-phase current.

  If this Example is used, since a blade | wing can be arrange | positioned on the same plane as a motor, there exists an advantage which can implement | achieve a fan apparatus with a more flat structure. Further, in this embodiment, the two rotors can be rotated at different rotational speeds in the same direction by one set of coils, so that it can be applied to a more appropriate thin motor system.

  FIG. 14 shows another embodiment which is different from the embodiment shown in FIGS. 1 to 13, and is a motor having a different rotation speed and rotation direction. The first rotor 10 in FIG. 14 has the same structure as the first rotor 10 in FIG. 4 and uses a 16-pole magnet. Further, the second rotor 20 in FIG. 14 has the same 14 poles as the second rotor in FIG. The stator core 310 of FIG. 14 is shown in FIG. There are three columnar cores, which are the same as in FIG. 1 (FIG. 4). The total number of teeth in the first nail shape tooth group and the second nail shape tooth group is twelve. Accordingly, the relationship between the first rotor 10 and the first claw-shaped teeth group in FIG. 14 is the same as that of the first rotor and the first claw-shaped teeth in FIG. 4, and the first rotor 10 has a rotational speed. It rotates clockwise at 1/8 of the frequency of the three-phase current. On the other hand, the relationship between the second rotor 20 (inner rotation type) and the second claw-shaped teeth group of FIG. 14 is the same as that of the first rotor 10 (external rotation type) and the first claw-shaped teeth group of FIG. The second rotor 20 of FIG. 14 rotates in the counterclockwise direction in synchronism with 1/7 of the frequency of the three-phase current.

  By using this embodiment, it is possible to configure a motor in which two rotors rotate in slightly different directions at slightly different speeds. This motor can also be applied to a high-performance counter rotating fan. In any of the embodiments, a motor that rotates two rotors in different directions or at different rotational speeds by passing a current of one frequency through a set of coils can be configured. There is an advantage that a simple system can be realized.

  The above is an embodiment applied to a three-phase motor and a fan device, but it goes without saying that it can be applied to a two-phase motor or a multi-phase motor. It is obvious that a motor can be realized in a combination different from the embodiment by using the principle described in the embodiment. Further, the number of poles, the number of teeth, and the number of columnar cores are not limited in the present embodiment, and the configuration based on the present invention can be widely applied.

Exploded view of a three-phase motor having two rotors characteristic of an embodiment of the present invention Sectional drawing of the fan apparatus using the motor of FIG. External view when the stator of Fig. 1 is assembled Sectional view seen from the front and side of the motor of FIG. Front view of the stator core constituting the stator of FIG. FIG. 1 is a development view of a rotor and a stator showing the operation principle of the motor of FIG. Sectional drawing when it sees from the front and side of the motor which the 1st rotor and 2nd rotor which are the characteristic of the Example of this invention rotate at a different speed in a different direction Front view of the stator core constituting the stator of the motor of FIG. External view of the stator core of FIG. FIG. 8 is an exploded view of the rotor and stator showing the operating principle of the motor of FIG. A fan device having a structure in which the thickness of the main body, which is characteristic of the embodiment of the present invention, is further reduced. Sectional drawing when it sees from the front and side of the motor applied to the fan apparatus of FIG. FIG. 12 is an external view of a stator core constituting the motor of FIG. The figure explaining the motor which a 1st rotor and a 2nd rotor rotate at a different speed in a different direction in another Example different from FIG.1, FIG.6, FIG.8. External view of the stator core of FIG.

Explanation of symbols

10: 1st rotor 11: 1st rotary member 12, 13, 14: 1st magnet 20: 2nd rotor 21: 2nd rotary member 22, 23, 24: 2nd magnet 30: Stator
31, 33, 34, 36, 37, 38, 39, 310: stator core 32, 35: coil 41 fan frame 42: motor fixing member 43 filter 44, 46: first fan 45, 47: second fan

Claims (11)

A first rotor that rotates about a rotation axis;
A second rotor that is provided outside the first rotor and rotates about the rotation axis;
In the motor having the stator provided on the outer peripheral side of the first rotor and on the inner peripheral side of the second rotor,
The stator core constituting the stator is
A first claw-shaped tooth having a plurality of magnetic pole faces extending in the direction of the rotation axis and facing the first rotor with a gap;
An annular radial yoke portion extending in the outer radial direction from the first claw-shaped teeth;
A plurality of magnetic pole faces extending in the direction of the rotation axis from the radial yoke portion, and formed by a second claw-shaped tooth having a magnetic pole face opposed to the second rotor with a gap;
The stator core is paired with each other, and a plurality of coils are sandwiched between the stators,
The annular radial yoke portion has a plurality of columnar columnar cores on which the coils are arranged,
The magnetic flux generated in the coils arranged in the plurality of columnar cores reaches the first rotor from the first claw-shaped teeth, and rotates the first rotor.
The magnetic flux generated in the coils of the plurality of columnar cores reaches the second rotor from the second claw-shaped teeth to rotate the second rotor ,
The arrangement of the second claw-shaped teeth having claw-shaped teeth not located on an extension line connecting the center of an arbitrary claw-shaped tooth among the first claw-shaped teeth and the center of the rotating shaft is used. Characteristic motor. 2. The motor according to claim 1, wherein the positional relationship between the first claw-type teeth and the plurality of columnar cores is constant in the circumferential direction in each phase, and the second claw-type teeth and the plurality of columnar cores. A motor characterized in that the positional relationship with the core is different for each phase.   3. The motor according to claim 1, wherein the first rotor and the second rotor are rotated in different directions.   The motor according to claim 1, wherein the first rotor and the second rotor rotate at the same speed.   The motor according to claim 1, wherein the first rotor and the second rotor rotate at different speeds. The motor according to claim 1 , wherein
The stator is formed by compressing and molding a powder magnetic material. A fan comprising the motor according to claim 1 , comprising a first rotor blade driven by the first rotor and a second rotor blade driven by the second rotor. Characteristic fan. A first rotor, a second rotor, a first rotor for rotating the first rotor around the rotation axis;
A second rotor that is provided outside the first rotor and rotates the second rotor blade about the rotation axis;
In a fan provided with a motor having an outer peripheral side of the first rotor and a stator provided on the inner peripheral side of the second rotor,
The stator core constituting the stator is
A first claw-shaped tooth having a plurality of magnetic pole faces extending in the direction of the rotation axis and facing the first rotor with a gap;
An annular radial yoke portion extending in the outer radial direction from the first claw-shaped teeth;
A plurality of magnetic pole faces extending in the direction of the rotation axis from the radial yoke portion, and formed by a second claw-shaped tooth having a magnetic pole face opposed to the second rotor with a gap;
The stator core is paired with each other, and a plurality of coils are sandwiched between the stators,
The annular radial yoke portion has a plurality of columnar columnar cores on which the coils are arranged,
The magnetic flux generated in the coils arranged in the plurality of columnar cores reaches the first rotor from the first claw-shaped teeth, and rotates the first rotor .
The magnetic flux generated by the coils of the plurality of columnar cores reaches the second rotor from the second claw-shaped teeth to rotate the second rotor, and the inside of the first claw-shaped teeth a motor shall be the sequence of the second claw-shaped teeth having a claw teeth not positioned on an extension that connects the center center and the rotational axis of any of the claw-shaped teeth of
A filter that removes an object contained in a fluid flowing in the direction of the rotation axis of the motor by the rotation of the first rotor blade and the second rotor blade;
A motor fixing member for attaching a stator of the motor;
A fan comprising: a fan frame that supports the filter and the motor fixing member. 9. The fan according to claim 8, wherein the positional relationship between the first claw-type teeth and the plurality of columnar cores is constant in the circumferential direction in each phase, and the second claw-type teeth and the plurality of columnar cores. The fan is characterized in that the positional relationship with the core is different for each phase. The fan according to claim 9 , wherein
The first rotating blade and the second rotating blade rotate in different directions at the same speed. The fan according to claim 9 , wherein
The fan is characterized in that the stator is formed by compression molding a powder magnetic material.

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