JP6251919B2 - Hub dynamo - Google Patents

Description

  The present invention relates to a hub dynamo.

2. Description of the Related Art Generators that generate electricity by rotating wheels are widely used to supply power to bicycle headlights and taillights. Such generators have various structures, but a so-called hub dynamo that is attached to a wheel shaft is known.
The conventional hub dynamo is mainly configured as a single-phase AC generator. The single-phase AC generator outputs a voltage waveform as shown in FIG.

  Recently, as a bicycle lamp, a lamp using a light emitting diode (LED) (hereinafter referred to as an LED lamp) has been used for power saving. Therefore, when supplying the output of the single-phase AC generator to the lamp, the output of the waveform shown in FIG. 20 after full-wave rectification of the voltage waveform shown in FIG. 19 is supplied.

  However, it has been found that the LED lamp flickers when traveling at a low speed because the light emission response is very good. The cause of the flicker is because, as shown in FIG. 20, there is a point where the output voltage drops to 0 volts in the voltage waveform after rectification. When a filament-type light bulb is used instead of an LED lamp, flicker does not occur even if a voltage waveform as shown in FIG. 20 is supplied to the lamp because the light emission response of the light bulb is poor. However, when using an LED lamp, it turned out that the improvement of a flicker is required.

  For this reason, in order to prevent flickering when using an LED lamp, an example using a three-phase AC generator is shown (for example, refer to Patent Document 1). In this example, by rectifying and synthesizing three-phase alternating current, an uninterrupted voltage and current are supplied to the LED lamp so that illumination light without flickering can be emitted.

JP 2007-129877 A

  However, when a three-phase AC generator is used as in the above-described prior art, the equipment is excessive, the cost is high, and compactness is sometimes difficult.

  Therefore, the present invention has been made in view of the above-described circumstances, and can suppress flickering at the time of light emission when power is supplied to the LED lamp, and can be reduced in cost and made compact with a simple configuration. The object is to provide a hub dynamo capable of.

In order to solve the above-described problems, a hub dynamo according to the present invention includes a permanent magnet mainly composed of ferrite that rotates with a wheel and in which N-pole and S-pole magnetic poles are alternately arranged in a circumferential direction. A rotor and a stator fixed to a wheel shaft rotatably supporting the wheel and disposed on an inner peripheral side of the rotor, and the stator is annularly wound around the wheel shaft. And a stator core that surrounds the coil and has a number of teeth facing the permanent magnet and having the number of poles corresponding to the number of magnetic poles on the outer periphery. A unit and a second stator unit are combined in the axial direction of the wheel shaft, and an end portion of the coil is separated from the stator through a groove provided along the wheel shaft. Is led to the outside by the rotation of the rotor, an alternating current output from the coils of the stator are configured to provide full-wave rectification to the light emitting diode, said stator, phase-shifted alternating currents The first stator unit and the second stator unit are combined by shifting the positions of the teeth of each stator unit in the circumferential direction by a predetermined angle. Thereby, the coil of the first stator unit and the coil of the second stator unit output alternating currents whose phases are shifted from each other .

In this configuration, for example, when the voltages output from the two-phase coils of the multiphase coils are the A-phase voltage and the B-phase voltage, the A-phase voltage and the B-phase voltage do not become 0 V at the same time. Accordingly, there is no point where the combined output of the two-phase output after full-wave rectification falls to 0 V, and by supplying this output to the LED lamp, flickering during light emission can be suppressed. In addition, since it has two phases, it can be equipped with the minimum necessary equipment to prevent flickering, and can contribute to cost reduction and compactness.
In addition, the permanent magnet of the rotor and the teeth of the stator core are opposed to each other, and an alternating magnetic flux is generated in the stator core as the rotor rotates, thereby causing a current to flow through the coil of the stator to generate power. Specifically, the teeth arranged in the circumferential direction alternately become N poles or S poles, an alternating magnetic flux is generated in the stator core, and an alternating current is output from the coil.
Further, the alternating current output from the coil of the first stator unit and the alternating current output from the coil of the second stator unit are out of phase, and there is no point at which the alternating voltage drops to 0V at the same time. Therefore, flickering at the time of light emission of the LED lamp can be suppressed by supplying the combined output after full-wave rectification of the output of the two-phase coil to the LED lamp.

  In the hub dynamo according to the present invention, the stator surrounds the coil around the wheel shaft, and surrounds the coil, and is opposed to the permanent magnet on the outer peripheral portion and corresponds to the number of the magnetic poles. A plurality of claw pole type stator units each including a stator core having a number of pole teeth are combined in the axial direction of the wheel shaft.

  In the hub dynamo according to the present invention, the number of teeth of each of the first and second stator units and the number of poles of the magnetic poles arranged in the circumferential direction of the permanent magnet are P, the pitch angle of the teeth is θ, When the circumferential shift angle between the teeth of the first stator unit and the teeth of the second stator unit is α, the number of poles P and the pitch angle θ are α = θ / 2 = (360 ° / P). It is set to satisfy / 2.

  In this configuration, since the circumferential shift angle α between the teeth of the first stator unit and the teeth of the second stator unit is set as described above, the phase shift of the output of the two-phase coil is reduced to the electrical angle. Can be set to 90 °. Therefore, it is possible to reduce the difference between the minimum value and the maximum value of the combined output after full-wave rectification of the voltage waveform whose phase is shifted by 90 °, and supply the combined output after full-wave rectification to the LED lamp. The flicker at the time of light emission of the lamp can be effectively suppressed. For example, when the rotor rotates at the same speed as conventional single-phase power generation, the LED lamp flicker can be reduced to half or less. In addition, in the case of allowing the same degree of flicker as in conventional single-phase power generation, the number of poles of the stator and the number of poles of the permanent magnet can be halved, which can contribute to cost reduction.

  The hub dynamo according to the present invention is characterized in that the permanent magnet is composed of a plurality of magnet parts that constitute each magnet region separately.

  In this configuration, since the permanent magnet can be configured by separately manufacturing and combining the magnet parts in each magnet region, each magnet part can be easily magnetized.

  In the hub dynamo according to the present invention, the permanent magnet is composed of one magnet component, and each magnet region is formed by magnetizing in the circumferential direction and the axial direction on the magnet component.

  In this configuration, since the magnetic poles of the respective magnet regions are magnetized on the same magnet portion, it is possible to facilitate the handling of the parts.

  The hub dynamo according to the present invention is characterized in that the permanent magnet has magnetic poles arranged in a circumferential direction of the permanent magnet formed obliquely with respect to the axial direction of the rotor.

  In this configuration, the positions of the magnetic poles in each magnet region can be easily shifted from each other in the circumferential direction.

The hub dynamo according to the present invention is provided with a magnetic flux leakage prevention portion for preventing magnetic flux leakage between the respective stator units between the first stator unit and the second stator unit. Features.

In this configuration, leakage of magnetic flux between the stator units can be prevented by the magnetic flux leakage prevention portion provided between the stator units.
For example, magnetic flux generated in the N pole teeth of the first stator unit among the plurality of stator units can be prevented from flowing into the S pole teeth of the adjacent second stator unit. Further, it is possible to prevent the magnetic flux generated in the N pole teeth of the second stator unit from flowing into the S pole teeth of the adjacent first stator unit. Therefore, the magnetic flux generated in the teeth of the first stator unit does not flow through the second stator unit, but only passes through the coil of the first stator unit, and is also generated in the teeth of the second stator unit. The magnetic flux that passes through the coil of the second stator unit does not flow through the first stator unit. As a result, the leakage magnetic flux between the magnetic paths of the first stator unit and the second stator unit having different phases is eliminated, thereby improving the characteristics of the hub dynamo.

  The hub dynamo according to the present invention is characterized in that a space for separating the stator units is secured between the stator units as the magnetic flux leakage prevention portion.

  In this configuration, leakage of magnetic flux between the stator units can be prevented by the space secured between the stator units. Therefore, it is possible to improve the characteristics of the hub dynamo by adopting a simple configuration that secures a space between the stator units.

  The hub dynamo according to the present invention is characterized in that a spacer for securing the space is disposed between the stator units.

  In this configuration, since the space is secured by arranging spacers between the stator units, it is possible to easily secure a certain space.

  The hub dynamo according to the present invention is characterized in that a spacer made of a nonmagnetic material is disposed as the magnetic flux leakage prevention portion between the end faces of each stator unit facing each other.

  In this configuration, leakage of magnetic flux between the stator units can be prevented by the action of the spacer made of a nonmagnetic material disposed between the end faces of the stator units facing each other.

  The hub dynamo according to the present invention is characterized in that the spacer is attached to at least one of end faces of each stator unit facing each other.

  In this configuration, the trouble of arranging the spacer can be simplified.

  According to the hub dynamo according to the present invention, flicker during light emission when power is supplied to the LED lamp can be suppressed. In addition, since two-phase alternating current is output, the minimum necessary equipment for preventing flickering is required, and cost reduction and compactness can be achieved.

It is a mounting schematic diagram of the hub dynamo in the first embodiment of the present invention. It is a side view of the hub dynamo in a 1st embodiment of the present invention. It is sectional drawing of the hub dynamo in 1st Embodiment of this invention. It is a perspective view of the stator which comprises the hub dynamo in 1st Embodiment of this invention. It is a figure for demonstrating the shift | offset | difference of the phase of the teeth of the A-phase stator core and the teeth of the B-phase stator core in the first embodiment of the present invention. It is a figure which shows the voltage waveform which the hub dynamo in 1st Embodiment of this invention outputs. It is a figure which shows the waveform after carrying out full wave rectification of the output of FIG. It is a front view which shows the structure of the side yoke of the stator core of the hub dynamo in 1st Embodiment of this invention. It is a front view of the modification of the side part yoke in 1st Embodiment of this invention. It is sectional drawing of the hub dynamo in 2nd Embodiment of this invention. It is a perspective view which shows the structure of a part of stator which comprises the hub dynamo in 2nd Embodiment of this invention. It is sectional drawing of the hub dynamo in 3rd Embodiment of this invention. It is sectional drawing of the hub dynamo in 4th Embodiment of this invention. It is a side view of the stator which comprises the hub dynamo in 5th Embodiment of this invention. It is a block diagram of the rotor which comprises the hub dynamo in 5th Embodiment of this invention, (a) is a sectional side view, (b) is the front view seen from the axial direction. In the fifth embodiment of the present invention, the position of the magnetic pole of the first magnet region for the A phase corresponding to the teeth of the A phase stator core and the second magnet region for the B phase corresponding to the teeth of the B phase stator core. It is a figure for demonstrating the shift | offset | difference of a phase with the position of a magnetic pole. It is a block diagram of the rotor which comprises the hub dynamo in 6th Embodiment of this invention, (a) is a sectional side view, (b) is the front view seen from the axial direction. The position of the magnetic pole in the first magnet region for A phase corresponding to the A phase stator core in the sixth embodiment of the present invention, and the position of the magnetic pole in the second magnet region for B phase corresponding to the B phase stator core It is a figure for demonstrating the shift | offset | difference of a phase. It is a figure which shows the voltage waveform which the conventional single phase alternating current generator outputs. It is a figure which shows the waveform after carrying out full wave rectification of the output of FIG.

Hereinafter, a hub dynamo according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an installation schematic diagram of the hub dynamo of the first embodiment. In the following description, a case where the hub dynamo 10 of the present invention is attached to the wheel shaft 11 of the bicycle 1 and power is supplied to the headlamp 4 of the bicycle 1 will be described. The headlamp 4 uses an LED lamp as a lamp, not a filament type bulb. Further, it is assumed that a circuit for rectifying and synthesizing the output of the hub dynamo 10 is incorporated in the LED lamp driving circuit.

(Hub dynamo mounting mode)
As shown in FIG. 1, the front wheel 5 of the bicycle 1 is rotatably supported via a wheel shaft 11 by a front fork 3 constituting a part of the frame. Both sides of the wheel shaft 11 are fastened and fixed to the front fork 3 by a nut (not shown) or the like so as not to rotate. A hub dynamo 10 is attached coaxially to the wheel shaft 11 at most of the axial center of the wheel shaft 11. The hub dynamo 10 supplies electric power to the headlamp 4 disposed on the side of the front wheel 5.

  The hub dynamo 10 is connected to the spoke 2 of the front wheel 5 and rotates around the wheel shaft 11 together with the front wheel 5, and is mounted on the wheel shaft 11 in a non-rotatable manner while being positioned on the inner peripheral side of the rotor 12. And a stator 13.

  Hereinafter, the axial direction of the central axis O of the wheel shaft 11 is simply referred to as an axial direction, a direction orthogonal to the axial direction is referred to as a radial direction, and a direction along the central axis O is referred to as a circumferential direction. Note that a male screw portion is formed in a portion of the wheel shaft 11 that is located at least on the axially outer side than the portion to which the stator 13 is attached.

(Rotor)
FIG. 2 is a side view of the hub dynamo, and FIG. 3 is a cross-sectional view of the hub dynamo.
As shown in FIGS. 2 and 3, the rotor 12 is mainly composed of a hub shell 100. The hub shell 100 includes a cylindrical body portion 61, and a first end plate 70 and a second end plate 80 that close both axial end openings of the body portion 61.

As shown in FIG. 3, the opening on one axial side P side (the left side in FIG. 3) of the body portion 61 is open at the time of manufacture, and is manufactured separately from the body portion 61 so as to close the opening. The second end plate 80 is press-fitted and fixed to the end portion on the one axial side P side of the body portion 61 after a predetermined assembly process.
The opening on the other axial side Q side (the right side in FIG. 3) of the body portion 61 is closed from the time of manufacture by the first end plate 70 formed integrally with the body portion 61. The cylindrical body portion 61 and the first end plate 70 that closes the opening on the other axial side Q side of the body portion 61 are manufactured as a hub shell body 60 that is an integral part. The hub shell main body 60 and the second end plate 80 that is separate from the hub shell main body 60 are manufactured by press-molding a magnetic metal plate (mainly an iron plate) having a certain thickness.

A pair of left and right flange portions 62 projecting outward in the radial direction is formed on the outer periphery of both end portions in the axial direction of the body portion 61 of the hub shell main body 60. Each flange portion 62 is formed by folding a metal plate, which is a raw material, into a U-shape at the time of press molding, and overlapping the axially inner flange plate 62a and the axially outer flange plate 62b in close contact with each other. Yes. A plurality of support holes 63 penetrating in the axial direction are formed in each flange portion 62 at equal intervals in the circumferential direction.
As shown in FIG. 1, the support holes 63 are engaged with inner ends of a plurality of spokes 2 extending from the rim 5 a of the front wheel 5 toward the inner diameter side. It should be noted that the support holes 63 of the left and right flange portions 62 are arranged so as to be out of phase by a half pitch.

The first end plate 70 that closes the opening on the other Q side of the body portion 61 in the axial direction includes an annular side wall 71 that swells in a conical shape on the outer side (Q side) in the axial direction, and an inner peripheral edge of the side wall 71 in the axial direction. A cylindrical bearing fitting wall 73 bent inward (P side), a bearing retainer wall 74 bent radially inward at the axially inner (P side) end of the bearing fitting wall 73, and the side wall 71 And a flange portion 75 provided continuously from the outer peripheral edge toward the radially outer side.
Since the flange portion 75 is continuous with the flange plate 62b outside the flange portion 62 on the other axial side Q side of the body portion 61, the body portion 61 and the first end plate 70 are integrated. ing. Thereby, the hub shell main body 60 as an integral part is configured.

The second end plate 80 that closes the opening on the one P side in the axial direction of the body portion 61 has an annular side wall 81 and a cylindrical shape that is bent axially inward (Q side) at the inner peripheral edge of the side wall 81. A bearing fitting wall 83, a bearing holding wall 84 bent radially inward at the axially inner (Q side) end of the bearing fitting wall 83, and an axially inner side (Q side) at the outer peripheral edge of the side wall 81. A cylindrical press-fitting fitting wall 85 that is bent.
The second end plate 80 is fixed to the body 61 by press-fitting the cylindrical press-fitting fitting wall 85 to the inner periphery of the opening on the one side P side in the axial direction of the body 61 of the hub shell main body 60. Has been.

  The radially inner sides of the bearing fitting walls 73 and 83 of the first end plate 70 and the second end plate 80 are opened as coaxially located through holes 72 and 82, and these through holes 72 and 82 are opened. Bearings (bearings) 21 and 22 are fitted to the inner peripheries of the defining bearing fitting walls 73 and 83, respectively. The rotor 12 mainly composed of the hub shell 100 is rotatably supported by the wheel shaft 11 via the bearings 91 and 22 so that the rotor 12 rotates about the wheel shaft 11 as the front wheel 5 rotates. ing. That is, the rotor 12 functions as a hub that rotatably supports the front wheel 5.

  A permanent magnet 19 made of, for example, ferrite is disposed on the inner periphery of the body 61 of the hub shell main body 60. The radius of curvature of the outer peripheral surface of the permanent magnet 19 is set to be equal to the radius of the inner peripheral surface of the body 61, and the permanent magnet 19 is directly connected to the inner periphery of the body 61 made of a magnetic material without a yoke. It arrange | positions in the closely_contact | adhered state, for example, is stuck with the adhesive agent etc. The permanent magnet 19 covers the entire outer peripheral surface of the stator 13 by arranging the permanent magnet 19 in a cylindrical shape along the inner peripheral surface of the body portion 61. The permanent magnet 19 is incorporated in the inner periphery of the body 61 in a state of being divided into a plurality in the circumferential direction.

  N-pole and S-pole magnetic poles are alternately magnetized along the circumferential direction on the inner circumferential surface of the permanent magnet 19 arranged in a cylindrical shape. Specifically, each of the N poles and the S poles is 14 poles, and a total of 28 poles are magnetized so that the N poles and the S poles are alternately arranged. In this case, the N-pole and S-pole magnetic poles are formed in parallel to the axial direction from one end to the other end in the axial direction without being displaced in the circumferential direction.

(Stator)
FIG. 4 is a perspective view of a stator constituting the hub dynamo.
As shown in FIG. 4, the stator 13 is configured by combining a claw pole type first stator unit 20 </ b> A and a second stator unit 20 </ b> B in the axial direction of the wheel shaft 11. 20A outputs an A-phase alternating current / voltage, and the second stator unit 20B outputs a B-phase alternating current / voltage.

  As shown in FIG. 3, each of the stator units 20A and 20B includes a coil 24 wound around the wheel shaft 11 via a bobbin (not shown), a coil 24 surrounding the coil 24, and a permanent magnet 19 on the outer periphery. And stator cores 26 having teeth 22 (22-1 and 22-2) having the number of poles corresponding to the number of magnetic poles.

  The stator core 26 is disposed opposite to the central yoke 25 disposed on the inner periphery of the annular coil 24 and to one side (Q side) and the other side (P side) of the annular coil 24 in the axial direction. The inner peripheral portion is disposed on a pair of disc-shaped side yokes 21 (21-1, 21-2) magnetically coupled to one end and the other end of the central yoke 25, and the outer peripheral portion of the stator core 26. Teeth 22 that face the inner peripheral side of the permanent magnet 19 of the rotor 12 via a gap, are magnetically coupled to the outer peripheral portions of the side yokes 21-1 and 21-2, and are alternately arranged in the circumferential direction. (22-1 and 22-2).

  The teeth 22 (22-1 and 22-2) are respectively formed integrally with the disk-shaped side yoke 21 (21-1 and 21-2). Then, the tooth 22-1 formed integrally with the side yoke 21-1 on one side (Q side) in the axial direction and the side yoke 21-2 on the other side (P side) in the axial direction are formed integrally. The teeth 22-2 thus formed are alternately arranged with a minute interval in the circumferential direction. In addition, each side yoke 21-1, 21-2 has 14 teeth 22-1, 22-2, respectively, and the number of poles of all the teeth 22 (22-1 and 22-2) is the permanent magnet 19. Corresponds to the number of magnetic poles.

  The side yoke 21 (21-1, 21-2) on the other Q side in the axial direction and the one P side in the axial direction integrally having the teeth 22 (22-1 and 22-2) has the same shape. The side yoke 21-1 on the other Q side in the axial direction has the teeth 22-1 facing the one side P in the axial direction, and the side yoke 21-2 on the one side P in the axial direction has the teeth 22-2 in the axial direction On the other hand, they are combined with each other on the wheel shaft 11 toward the Q side. In the center of the disk-shaped side yoke 21 (21-1, 21-2), a center hole 23 that fits to the outer periphery of the wheel shaft 11 is formed. 11 is fixed.

(Combination of first stator unit and second stator unit)
As shown in FIG. 4, the first stator unit 20A and the second stator unit 20B are combined such that the positions of the teeth 22 of the stator units 20A and 20B are shifted from each other in the circumferential direction by a predetermined angle α. As a result, two-phase alternating currents and voltages of phase A and phase B are output from the coils 24 of the stator units 20A and 20B.

In this embodiment, as shown in FIG. 5, the number of poles of the teeth 22 (22-1 and 22-2) and the permanent magnets in the first and second stator units 20A (A phase) and 20B (B phase). The number of poles of 19 magnetic poles is P, the pitch angle of the teeth 22 (22-1 and 22-2) is θ, the teeth 22 (22-1 and 22-2) of the first stator unit 20A and the second stator unit. When the circumferential shift angle of 20B teeth (22-1 and 22-2) is α, the angle α is
α = θ / 2 = (360 ° / P) / 2 (1)
It is set to satisfy.

  When the angle α satisfies the expression (1), the coil 24 of the first stator unit 20A and the coil 24 of the second stator unit 20B are 90 ° in electrical angle with each other according to the rotation of the rotor 12. Output alternating current and voltage out of phase.

  In addition, in order to combine the first stator unit 20A and the second stator unit 20B in a relationship that is phase-shifted in the circumferential direction by a deviation angle α, circumferential positioning means (not shown) is provided. Further, as shown in FIG. 3, the side yoke 21-2 on the one axial side P side of the first stator unit 20A and the side yoke 21- on the other Q side in the axial direction of the second stator unit 20B are adjacent to each other. 1 is arranged back to back.

(Regulation Department)
As shown in FIG. 3, a restricting portion that restricts the movement of the stator 13 in the axial direction is provided on portions of the wheel shaft 11 that are located on both sides in the axial direction of the stator 13. The restricting portion of the present embodiment includes a special nut 30 provided on one axial P side of the stator 13 of the wheel shaft 11 and a stator fixing member 37 provided on the other axial Q side. . The stator 13 is sandwiched and fixed at a fixed position in the axial direction by the special nut 30 and the stator fixing member 37 fixed to the outer periphery of the wheel shaft 11.

  The special nut 30 includes a sleeve portion 30a formed on the one side P in the axial direction and a flange portion 30b formed on the one side P in the axial direction and having an outer diameter enlarged relative to the sleeve portion 30a. Then, the internal thread portion is fixed to the outer periphery of the wheel shaft 11 by screwing the internal thread portion formed on the inner periphery to the external thread portion of the wheel shaft 11.

The outer peripheral surface of the sleeve portion 30a is fixed to the inner periphery of the inner ring of the bearing 92 in which the outer ring is fitted to the bearing fitting wall 83 of the second end plate 80 by press fitting or the like. The outer diameter of the flange portion 30 b is formed larger than the inner diameter of the bearing 92, and the end surface located on the one side P in the axial direction is in contact with the inner ring of the bearing 92 in the axial direction. Thereby, the bearing 92 is mounted so that the outer ring side is rotatable around the wheel shaft 11.
On the other hand, the end face located on the one side P side in the axial direction of the flange portion 30 b is in contact with the inner peripheral portion of the stator 13 in the axial direction. As shown in FIG. 4, a groove 30 c is formed on the outer peripheral surface of the special nut 30 for drawing the end of the conductive wire constituting the coil 24 to the outside of the hub dynamo 10.

  As shown in FIG. 3, a connector 40 is disposed outside the second end plate 80, and a conductor (not shown) of the coil 24 is introduced into the connector 40. The end portion of the conducting wire is led to the conducting wire lead-out portion 43 of the connector 40 through the groove 30c (see FIG. 4) of the special nut 30, and is led out of the hub dynamo 10 through the conducting wire lead-out portion 43. Yes. A sleeve portion 30 a of a special nut 30 is inserted through the inner peripheral portion of the connector 40, and the connector 40 is fixed to the wheel shaft 11 by a nut 46 via a washer 45.

  A sleeve member 50 is provided on the wheel shaft 11 on the other Q side in the axial direction from the stator fixing member 37. This sleeve member 50 is a cylindrical member having an internal thread portion formed on the inner peripheral surface, and is attached to the external thread portion of the wheel shaft 11 from the other Q side in the axial direction. Specifically, the sleeve member 50 includes a sleeve main body 50a formed on one side P in the axial direction and a flange portion 50b formed on the other Q side in the axial direction and having an outer diameter enlarged relative to the sleeve main body 50a. ing.

  The flange portion 50b is formed in a polygonal cylindrical shape, and the end surface on the one axial side P side is in contact with the inner ring of the bearing 91 on the first end plate 70 side in the axial direction. The sleeve main body 50a is formed in a cylindrical shape, and is fitted into the inner circumference of the inner ring of the bearing 91 on the first end plate 70 side. Specifically, the sleeve main body 50a has an outer diameter set to be equal to or slightly larger than the inner diameter of the bearing 91, and is fixed to the inner periphery of the inner ring of the bearing 91 by press fitting or the like.

  A cover 54 is attached to the outside of the first end plate 70 so as to cover the bearing 91 and the sleeve member 50. The cover 54 is a member formed in a bowl shape, and prevents water, dust beach, and the like from entering the rotor 12 from the outside. A nut 52 screwed to the wheel shaft 11 is arranged on the inner peripheral portion of the cover 54 to prevent the sleeve member 50 from loosening.

(Power generation mechanism)
The power generation of the hub dynamo configured in this way is performed as follows.
That is, when the front wheel 5 rotates, the rotor 12 connected to the front wheel 5 by the spoke 2 rotates around the wheel shaft 11 together with the front wheel 5, and the permanent magnet 19 rotates around the stator 13.

  Due to the magnetic flux of the rotating permanent magnet 19, the first tooth 22-1 provided on the side yoke 21-1 on the other Q side in the axial direction is provided on the side yoke 21-2 on the N pole, one P side in the axial direction. The state where the second tooth 22-2 is the S pole and the state where the first tooth 22-1 is the S pole and the second tooth 22-2 is the N pole are alternately repeated. . Thereby, an alternating magnetic flux is generated in the stator core 26 of the A-phase first stator unit 20A and the stator core 26 of the B-phase second stator unit 20B, and this alternating magnetic flux causes the first and second stator units 20A, A current flows through each coil 24 of 20B to generate power.

  At this time, the alternating current / voltage output from the coil 24 of the first stator unit 20A and the alternating current / voltage output from the coil 24 of the second stator unit 20B are out of phase and are simultaneously alternating. There is no point where the voltage drops to 0V.

  In particular, the circumferential shift angle α of the teeth 22 (22-1 and 22-2) of the first stator unit 20A and the teeth 22 (22-1 and 22-2) of the second stator unit 20B is the teeth 22. As shown in FIG. 6, the phase shift of the voltage waveform of the two-phase coil 24 of A phase and B phase is exactly 90 ° in electrical angle.

(effect)
Therefore, according to the above-described embodiment, the alternating current / voltage having a waveform that is 90 degrees out of phase in electrical angle is output from each of the first stator unit 20A and the second stator unit 20B. When the voltage is full-wave rectified, a voltage waveform as shown in FIG. 7 can be obtained. For this reason, the difference between the minimum value and the maximum value of the combined output after full-wave rectification can be reduced, and the combined output after full-wave rectification is effectively supplied to the LED, thereby effectively preventing flickering during LED emission. Can be suppressed.
For example, when the rotor 12 rotates at the same speed as the conventional single-phase power generation, the LED flicker can be reduced to half or less. Further, when the same degree of flicker as the conventional single-phase power generation is allowed, the number of poles (the number of teeth) of the stator 13 can be halved, which can contribute to cost reduction.

  Moreover, since the hub dynamo 10 of this embodiment performs AC power generation of two phases instead of three phases, it is necessary to provide the minimum necessary equipment for preventing flickering, contributing to cost reduction and downsizing. be able to.

(Operation and effect of side yoke of stator core)
Here, based on FIG. 8, FIG. 9, the effect of the side yoke 21 is demonstrated.
FIG. 8 is a front view showing the configuration of the side yoke of the stator core of the hub dynamo, and FIG. 9 is a front view showing another plan of the side yoke.

  In the side yoke 21 shown in FIG. 8, a plurality of slits 27 are formed radially outward from the center hole 23 in order to reduce eddy current loss. One of the slits 27 communicates with the outer periphery as a coil lead-out slit for the coil.

  Thus, when the slit 27 is formed from the center hole 23, the function of determining the radial position of the stator is weakened, and the coaxiality between the wheel shaft 11 and the stator 13 may be lowered.

(Modification of side yoke)
In order to improve this, in the side yoke 121 shown in FIG. 9, the slit 29 is formed not from the center hole 23 but from the outer periphery toward the radially inner side. Thereby, the coaxiality of the wheel shaft 11 and the stator 13 can be improved, and the air gap on the outer periphery (the gap between the outer periphery of the stator 13 and the permanent magnet 19) can be reduced by improving the accuracy. This makes it possible to improve characteristics or reduce costs.
In addition, the optional slit 29 can also serve as a coil lead-out portion, thereby eliminating the directionality during assembly (direction in the circumferential direction), thereby reducing assembly man-hours and preventing erroneous assembly. It becomes possible to plan.

  Incidentally, in the first embodiment, the stator core 26 of the first stator unit 20A and the stator core 26 of the second stator unit 20B are arranged close to each other, and the first stator unit 20A and the second stator are arranged. Since the unit 20B is arranged out of phase, the teeth 22 magnetized to the north pole of one stator unit 20A (or 20B) are changed to the teeth 22 magnetized to the south pole of the other stator unit 20B (or 20A). It turns out that there is a concern about magnetic flux leakage.

  Therefore, in the following, an embodiment in which such a fear of magnetic flux leakage can be solved will be described. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

(Second Embodiment)
FIG. 10 is a cross-sectional view of the hub dynamo according to the second embodiment of the present invention.
In the hub dynamo of the second embodiment, spacers 211 and 212 are provided between the first stator unit 20A and the second stator unit 20B, so that the first stator unit 20A and the second stator unit 20B are provided. A space 210 having a predetermined dimension for separating both stators in the axial direction is secured. The space 210 functions as a magnetic flux leakage prevention unit that prevents magnetic flux leakage between the first stator unit 20A and the second stator unit 20B. The width of the space 210 that separates the first stator unit 20A and the second stator unit 20B is based on the gap (gap) between the permanent magnet 19 and the outer peripheral surface of the stator 13 (the outer peripheral surface of the teeth 22). Is also set larger.

  The spacers 211 and 212 are made of a non-magnetic material such as resin or aluminum. One spacer 211 is formed in a ring shape, and the other spacer 212 is formed in a pin shape. For example, as shown in FIG. 11, the ring-shaped and pin-shaped spacers 211 and 212 are arranged on the outer surface of the side yoke 21-2 of the first stator unit 20A (this outer surface is the second stator unit 20B). Are attached to the center portion of the side yoke 21-1) and a position away from the center portion in the radial direction by a method such as adhesion or press-fitting. Here, a plurality of pin-like spacers 212 are provided on the same circumference at intervals in the circumferential direction.

  Thus, by attaching the spacers 211 and 212 to the first stator unit 20A in advance, the first stator unit 20A and the second stator unit 20B can be combined with each other when the stator 13 is assembled. Between the stator unit 20A and the second stator unit 20B, a space 210 having a predetermined width that functions as a magnetic flux leakage prevention unit can be secured.

  The ring-shaped spacer 211 and the pin-shaped spacer 212 may be attached to the second stator unit 20B instead of being attached to the first stator unit 20. Or you may divide and attach to both the 1st stator unit 20A and the 2nd stator unit 20B.

  In the hub dynamo of the second embodiment, since the space 210 is intentionally secured between the first stator unit 20A and the second stator unit 20B, the first stator unit 20A and the second stator unit 20B. It is possible to prevent magnetic flux leakage between the two. For example, it is possible to prevent the magnetic flux generated in the N-pole teeth 22 of the first stator unit 20A from flowing into the S-pole teeth 22 of the adjacent second stator unit 20B. Further, it is possible to prevent the magnetic flux generated in the N pole teeth 22 of the second stator unit 20B from flowing into the S pole teeth 22 of the adjacent first stator unit 20A.

  Therefore, the magnetic flux generated in the teeth 22 of the first stator unit 20A does not flow to the second stator unit 20B, but only passes through the coil 24 of the first stator unit 20A, and the second stator The magnetic flux generated in the teeth 22 of the unit 20B passes through the coil 24 of the second stator unit 20B without flowing to the first stator unit 20A. As a result, the leakage flux between the magnetic paths of the first stator unit 20A and the second stator unit 20B having different phases is eliminated, thereby improving the characteristics of the hub dynamo.

  In the hub dynamo of the second embodiment, only the space 210 is secured by the spacers 211 and 212 between the first stator unit 20A and the second stator unit 20B as a magnetic flux leakage prevention part. Therefore, the space 210 having a constant width can be easily secured with a simple configuration. In particular, since the spacers 211 and 212 are attached to at least one of the opposing end surfaces of the first stator unit 20A or the second stator unit 20B, the spacers 211 and 212 are attached to the first stator unit 20A and the first stator unit 20A. There is no need for assembling separately from the second stator unit 20B, and assembling can be simplified.

(Third embodiment)
FIG. 12 is a cross-sectional view of a hub dynamo according to a third embodiment of the present invention.
In the hub dynamo of the third embodiment, the pin-shaped spacer 212 used in the hub dynamo of the second embodiment is omitted, and only the ring-shaped spacer 211 is used, and the first stator unit 20A and the second stator unit 20B. A space 210 is secured between them.

  As described above, the spacer is only for securing the space 210 between the first stator unit 20A and the second stator unit 20B, and may be omitted as long as the assembly stability is achieved. For example, in the third embodiment, the case where the pin-shaped spacer 212 is omitted has been described, but instead, the pin-shaped spacer 211 may be left and the ring-shaped spacer 211 may be omitted. Further, the shape of the spacer can be arbitrarily changed. Further, the material of the spacer does not necessarily have to be a non-magnetic material as long as it does not significantly affect the magnetic flux leakage. Further, the first stator unit 20A and the second stator unit 20B are press-fitted onto the wheel shaft 11 in a state where the space 210 is secured between the first stator unit 20A and the second stator unit 20B. If it can be securely fixed by bonding or the like, the spacer itself can be saved.

  Further, instead of the space 210, a spacer made of a non-magnetic material can be interposed as a magnetic flux leakage prevention part.

(Fourth embodiment)
FIG. 13 is a cross-sectional view of a hub dynamo according to a fourth embodiment of the present invention.
In the hub dynamo according to the fourth embodiment, instead of securing the space 210 between the opposing end surfaces of the first stator unit 20A and the second stator unit 20B, the magnetic flux leakage prevention portion is made of a nonmagnetic material. A spacer 220 is arranged.

  In the hub dynamo of the fourth embodiment, the first stator unit 20A is operated by the action of the spacer 220 made of a nonmagnetic material disposed between the opposing end surfaces of the first stator unit 20A and the second stator unit 20B. And leakage of magnetic flux between the second stator unit 20B.

  In the first to fourth embodiments described above, the first stator unit 20A and the second stator unit 20B constituting the stator 13 are combined by shifting the position of the teeth 22 in the circumferential direction by a predetermined angle. Thus, the case has been described in which the coil 24 of the first stator unit 20A and the coil 24 of the second stator unit 20B output alternating currents that are out of phase with each other. However, the present invention is not limited to this, and the same effect can be obtained even if the magnetic pole positions of the permanent magnets at positions corresponding to the stator units 20A and 20B on the rotor side are shifted from each other by a predetermined angle β in the circumferential direction. be able to. An embodiment in that case will be described below.

(Fifth embodiment)
FIG. 14 is a side view of a stator constituting the hub dynamo in the fifth embodiment, FIG. 15 is a configuration diagram of the rotor, (a) is a side sectional view, and (b) is a front view as seen from the axial direction, FIG. 16 is a phase between the position of the magnetic pole in the first magnet region for the A phase corresponding to the teeth of the A phase stator core and the position of the magnetic pole in the second magnet region for the B phase corresponding to the teeth of the B phase stator core. It is a figure for demonstrating the shift | offset | difference of.

  As shown in FIG. 14, the stator 313 used in the hub dynamo of the fifth embodiment is different from the stator 13 used in the hub dynamo of the first to fourth embodiments, and the first stator unit 20A and the second stator 313 are used. The stator unit 20B is combined with the positions of the teeth 22 of the stator units 20A and 20B in the circumferential direction so as to coincide with each other.

  Instead of using the stator 313 shown in FIG. 14 as the stator, as shown in FIGS. 15 and 16, permanent magnets 319 provided on the rotor 312 are replaced with the first stator unit 20A and the second stator unit 20B. A phase-first magnet region 319A and B-phase second magnet region 319B, which are divided in the axial direction so as to correspond to each of the first and second magnet regions 319A, The positions of the magnetic poles 319B (N pole and S pole) are set to be shifted from each other in the circumferential direction by a predetermined angle β. As a result, the alternating current / voltage of the two phases of the A phase and the B phase, which are out of phase, is obtained from the coils 24 of the first and second stator units 20A and 20B in which the positions of the teeth 22 are aligned in the circumferential direction. Will be output.

In the present embodiment, as shown in FIG. 16, the number of poles of the magnetic poles in the first magnet region 319A (A phase) and the second magnet region 319B (B phase) is P, the pitch angle of the magnetic poles is θ, When the circumferential shift angle between the position of the magnetic pole of the magnet region 319A (A phase) and the position of the magnetic pole of the second magnet region 319B (B phase) is β, the angle β
β = θ / 2 = (360 ° / P) / 2 (2)
It is set to satisfy.

  When the angle β satisfies the expression (2), the coil 24 of the first stator unit 20A and the coil 24 of the second stator unit 20B are 90 ° in electrical angle with each other according to the rotation of the rotor 312. Output alternating current and voltage out of phase.

(Power generation mechanism)
The power generation of the hub dynamo configured in this way is performed as follows.
That is, when the front wheel 5 rotates, the rotor 12 connected to the front wheel 5 by the spoke 2 rotates around the wheel shaft 11 together with the front wheel 5, and the permanent magnet 319 rotates around the stator 13.

  A first tooth 22-1 provided on the side yoke 21-1 on the other axial Q side is provided on the side yoke 21-2 on the N pole and one axial P side by the magnetic flux of the rotating permanent magnet 319. The state where the second tooth 22-2 is the S pole and the state where the first tooth 22-1 is the S pole and the second tooth 22-2 is the N pole are alternately repeated. . Thereby, an alternating magnetic flux is generated in the stator core 26 of the A-phase first stator unit 20A and the stator core 26 of the B-phase second stator unit 20B, and this alternating magnetic flux causes the first and second stator units 20A, A current flows through each coil 24 of 20B to generate power.

  At this time, the alternating current / voltage output from the coil 24 of the first stator unit 20A and the alternating current / voltage output from the coil 24 of the second stator unit 20B are out of phase and are simultaneously alternating. There is no point where the voltage drops to 0V.

  In particular, the circumferential shift angle β between the position of the magnetic pole in the first magnet region 319A (A phase) of the permanent magnet 319 and the position of the magnetic pole in the second magnet region 319B (B phase) is the pitch angle θ of the magnetic pole. By setting it to 1/2, as shown in FIG. 6, the phase shift of the voltage waveform of the two-phase coil 24 of A phase and B phase is exactly 90 ° in electrical angle.

(effect)
Therefore, according to this 5th Embodiment, there can exist the same effect as the 1st-4th embodiment mentioned above. In the fifth embodiment, the position of the teeth 22 of the first stator unit 20A on the stator 313 side and the teeth 22 of the second stator unit 20A are shifted by shifting the position of the magnetic poles of the permanent magnet 319 on the rotor 312 side. Can be aligned in the circumferential direction, and the assembly of the stator 313 can be facilitated.

(Example of how to shift the magnetic pole of a permanent magnet)
By the way, a first magnet region 319A corresponding to the first stator unit 20A and a second magnet region 319B corresponding to the second stator unit 20B are formed in the permanent magnet 319 on the inner periphery of the rotor 312. As a configuration example in which the positions of the magnetic poles of the first magnet region 319A and the magnetic poles of the second magnet region 319B are set to be shifted from each other in the circumferential direction by a predetermined angle β, the following is an example. is there.

  First, as shown in FIG. 16 as a permanent magnet in the hub dynamo of the fifth embodiment, the first configuration example includes a permanent magnet 319 and a first magnet component 319-1 that constitutes the first magnet region 319A. The first magnet component 319-1 is separated from the first magnet component 319-1 and is combined with the second magnet component 319-2 constituting the second magnet region 319B. In this example, the magnetic poles (N pole and S pole) of each of the magnet regions 319A and 319B extend in parallel to the axial direction of the rotor.

  In this configuration example, since the permanent magnet 319 can be configured by separately manufacturing and combining the first magnet component 319-1 and the second magnet component 319-2, each magnet component 319-1, 319-2 can be easily magnetized.

  Next, in the second configuration example, although not shown, the first magnet region 319A and the second magnet region 319A are formed on the same magnet component, and the magnetic pole and the second magnet region of the first magnet region 319A are formed. The permanent magnet 319 is configured by magnetizing the magnetic pole of 319B in the circumferential direction and the axial direction on the same magnet component.

  In this configuration, since the magnetic poles of the first magnet region 319A and the magnetic poles of the second magnet region 319B are magnetized on the same magnet portion, handling of parts can be facilitated.

(Sixth embodiment)
Next, in the third configuration example, as shown as the hub dynamo rotor 412 of the sixth embodiment in FIGS. 17 and 18, the magnetic poles arranged in the circumferential direction of the permanent magnet 419 are arranged in the axial direction of the rotor 412. As a result, the position of the magnetic pole in the first magnet region 419A and the position of the magnetic pole in the second magnet region 419B are shifted from each other in the circumferential direction by a predetermined angle β. It is. In this case, the position of the center of the magnetic pole in the first magnet region 419A and the position of the center of the magnetic pole in the second magnet region 419B are shifted in the circumferential direction by a predetermined angle β.

  In this configuration, the position of the magnetic pole in the first magnet region 419A and the position of the magnetic pole in the second magnet region 419B can be easily shifted from each other in the circumferential direction.

  Of course, the fifth embodiment and the sixth embodiment may include the contents of the characteristic portions of the second to fourth embodiments (configurations that serve to prevent magnetic flux leakage).

  In the first to fourth embodiments, the position of the tooth 22 of the first stator unit 20A on the stator side and the position of the tooth 22 of the second stator unit 20B are shifted from each other in the circumferential direction. The case where the coil 24 of the stator unit 20A and the coil 24 of the second stator unit 20B output alternating currents that are out of phase with each other has been described. In the fifth and sixth embodiments, the positions of the teeth 22 of the first stator unit 20A on the stator side and the teeth 22 of the second stator unit 20B are aligned in the circumferential direction. By shifting the positions of the magnetic poles in the two magnet areas 319A, 319B, 419A, and 419B of the magnets 319 and 419 in the circumferential direction, the coil 24 of the first stator unit 20A and the coil 24 of the second stator unit 20B can be obtained. The case where alternating currents that are out of phase with each other are output has been described. However, the present invention is not limited to this, and the same effect can be obtained by combining both configurations.

(Seventh embodiment)
Although not shown, in the hub dynamo of the seventh embodiment, the first stator unit and the second stator unit are arranged such that the positions of the teeth of each stator unit are circular by a predetermined angle α (where α <θ / 2). They are combined with each other shifted in the circumferential direction. In addition, the permanent magnet provided on the rotor has first and second magnet areas divided in the axial direction so as to correspond to the first stator unit and the second stator unit, respectively. The positions of the magnetic poles of the first and second magnet regions are set so as to be shifted from each other in the circumferential direction by a predetermined angle β (where β <θ / 2). As a result, the first stator unit coil and the second stator unit coil output alternating currents whose phases are shifted from each other.

In addition, the number of teeth in each of the first and second stator units and the number of poles in the circumferential direction of the permanent magnet are P, the pitch angle of the teeth is θ, the teeth of the first stator unit and the second stator. When the deviation angle in the circumferential direction of the teeth of the unit is α, and the deviation angle in the circumferential direction between the magnetic pole position of the first magnet region and the magnetic pole position of the second magnet region of the permanent magnet is β, The number P and the pitch angle θ are
α + β = θ / 2 = (360 ° / P) / 2 (3)
It is set to satisfy.

  When the angle α + β satisfies the expression (3), the first stator unit coil and the second stator unit coil are alternately shifted in phase by 90 ° in electrical angle according to the rotation of the rotor. Outputs current and voltage.

  In this configuration, the alternating current output from the coil of the first stator unit and the alternating current output from the coil of the second stator unit are out of phase, and there is no point at which the alternating voltage drops to 0V at the same time. . Therefore, flickering at the time of light emission of the LED lamp can be suppressed by supplying the combined output after full-wave rectification of the output of the two-phase coil to the LED lamp.

  In particular, when α + β satisfies Expression (3), as shown in FIG. 6, the phase shift of the voltage waveform of the two-phase coils of the A phase and the B phase becomes exactly 90 ° in electrical angle. Therefore, the same effects as those of the first to sixth embodiments described above can be obtained.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the hub dynamo 10 having 28 magnetic poles is taken as an example, but the number of magnetic poles and the like is not limited to this embodiment and can be changed.

  Further, in the first and second stator units 20A and 20B of the hub dynamo 10 of the above embodiment, the side yoke 21 and the teeth 22 are formed as an integral part. You may make it couple | bond with.

  Further, in the first to fourth embodiments, the case where the phase shift angle α of the teeth 22 of the first stator unit 20A and the second stator unit 20B is set to ½ of the pitch angle θ of the teeth 22 is shown. However, the setting of the phase shift angle α is not limited thereto.

  In the fifth and sixth embodiments, the circumferential shift angle β between the magnetic pole positions of the first magnet regions 319A and 419A and the magnetic pole positions of the second magnet regions 319B and 419B is determined as the pitch angle of the magnetic poles. Although the case of setting to 1/2 of θ is shown, the setting of the phase shift angle β is not limited thereto.

Furthermore, in the above-described embodiment, a case has been described in which flickering during light emission of the LED lamp is suppressed by supplying a combined output after full-wave rectification of the output of the two-phase coil to the LED lamp. However, the present invention is not limited to this, and a combined output after full-wave rectification of outputs of multi-phase coils of two or more phases may be supplied to the LED lamp.
In this case, three or more of the plurality of stator units may be arranged while being shifted from each other in the circumferential direction by a predetermined angle. The rotor 12 is provided with a plurality of magnetic pole regions divided in the axial direction so as to correspond to the plurality of stator units, and the magnetic poles arranged in each magnetic pole region are shifted from each other in the circumferential direction by a predetermined angle. May be.

Moreover, although the claw pole type stator 13 has been described in the above embodiment, the present invention is not limited to this. For example, it is only necessary to include a two-phase coil that outputs an alternating current / voltage with a phase shift.
Furthermore, although embodiment mentioned above demonstrated the case where electric power was supplied to the headlamp 4 of the bicycle 1 with the hub dynamo of this invention, it is not restricted to this but is the structure which the rotor 12 rotates with respect to the wheel shaft 11. If there is, it can be used for the taillight of the bicycle 1.

Furthermore, in the above-described embodiment, the case where the stator 13 is configured by combining the claw pole type first stator unit 20A and the second stator unit 20B in the axial direction of the wheel shaft 11 has been described. However, the stator may be configured by providing three or more stator units and combining them in the axial direction.
In addition, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the known component, and you may combine the modification mentioned above suitably. For example, a function of increasing the output of the hub dynamo 10 and preventing the overvoltage from being applied to the headlamp 4 by changing the output to heat or the like in the high-speed rotation range of the rotors 12, 312, 412 may be employed. .

4 headlamps (light-emitting diodes)
5 Front Wheel 11 Wheel Shaft 12 Rotor 13 Stator 20A First Stator Unit 20B Second Stator Unit 22, 22-1, 22-2 Teeth 26 Stator Core 24 Coil 10 Hub Dynamo 19 Permanent Magnet
30c Groove 210 Space 211, 212 Spacer 220 Non-magnetic material spacer 312, 412 Rotor 313 Stator 319, 419 Permanent magnet 319A, 419A First magnet region 319B, 419B Second magnet region 319-1 First magnet part 319-2 Second magnet part

Claims (10)

A rotor having a permanent magnet mainly composed of ferrite that rotates with the wheel and in which N and S poles are alternately arranged in the circumferential direction;
A non-rotatable fixed to a wheel shaft that rotatably supports the wheel, and a stator disposed on the inner peripheral side of the rotor,
The stator includes a coil wound in an annular shape around the wheel shaft, a stator core that surrounds the coil, and has teeth on the outer peripheral portion facing the permanent magnet and having the number of poles corresponding to the number of magnetic poles. And a claw pole type first stator unit and a second stator unit each comprising a combination of them in the axial direction of the wheel shaft,
The end of the coil is drawn out of the rotor from the stator through a groove provided along the wheel axis,
By rotating the rotor, the alternating current output from the stator coil is full-wave rectified and supplied to the light emitting diode,
The stator is provided with a multi-phase coil that outputs an alternating current out of phase ,
The first stator unit and the second stator unit are combined by shifting the position of the teeth of each stator unit in the circumferential direction by a predetermined angle,
Thus , the hub dynamo is characterized in that the first stator unit coil and the second stator unit coil output alternating currents whose phases are shifted from each other . The number of poles of the teeth in each of the first and second stator units and the number of poles of the magnetic poles arranged in the circumferential direction of the permanent magnet are P, the pitch angle of the teeth is θ, and the teeth of the first stator unit When the deviation angle in the circumferential direction of the teeth of the second stator unit is α, the number of poles P and the pitch angle θ are
α = θ / 2 = (360 ° / P) / 2
The hub dynamo according to claim 1 , wherein the hub dynamo is set so as to satisfy. The hub dynamo according to claim 1 or 2 , wherein the permanent magnet is composed of a plurality of magnet parts that constitute each magnet region separately. The permanent magnet consists of one magnet parts, each magnetic region, any one of claims 1 to 3, characterized in that formed by magnetized in the circumferential direction and the axial direction on the magnet part The hub dynamo described in item 1. The permanent magnets are circumferentially arrayed poles of the permanent magnets, any one of claim 1 to claim 4, characterized in that it is formed obliquely to the axial direction of the rotor Hub dynamo as described in. Between said first stator unit and the second stator unit, the magnetic flux leakage prevention portion for preventing the leakage of magnetic flux between the respective stator units, characterized in that it is provided according to claim 1 wherein The hub dynamo according to any one of items 5 . The hub dynamo according to claim 6 , wherein a space for separating the stator units is secured between the stator units as the magnetic flux leakage prevention portion. The hub dynamo according to claim 7 , wherein a spacer for securing the space is disposed between the stator units. The hub dynamo according to claim 6 , wherein a spacer made of a nonmagnetic material is disposed as the magnetic flux leakage prevention portion between the end faces of each stator unit facing each other. The hub dynamo according to claim 8 or 9 , wherein the spacer is attached to at least one end face of the stator units facing each other.

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