JP2005041428A - Hub dynamo - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a stator at an axle side of a hub dynamo so as to realize a small diameter and miniaturization without reducing an output and a light weight when it is constituted with a coil body and a claw pole type iron core. <P>SOLUTION: The stator of the hub dynamo 3 is constituted so as to be provided with a main coil part 9 arranged with a pair of main coil iron cores 12, 13 becoming different pole each other at both sides of the coil body 9a; a first sub-coil part 14 adjacent to one of the main coil part 9 and having a single polar first sub-coil iron core 17 arranged at one side of the coil body 14a; and a second sub-coil part 15 adjacent to the other of the main coil part 9 and having a single polar second sub-coil iron core 19 arranged at the other side of the coil body 15a at the axle side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention belongs to the technical field of a hub dynamo attached to the tip of a fork constituting a bicycle frame.

Generally, in this type of bicycle, a generator is provided on an axle attached to a fork constituting the frame so that the power is generated by the rotation of a wheel as the bicycle travels, and a headlight or the like is turned on by the generated power. There is something configured. As a hub dynamo which is such a generator, a stator provided on the axle side is provided with a coil body and permanent magnets provided on both sides of the coil body and provided on the rotor side from the outer peripheral edge of the ring plate shape. There is one that is configured using a coil portion that includes a pair of iron cores (so-called claw pole type iron cores) formed with a plurality of magnetic pole pieces that are magnetized to either the N or S poles by receiving magnetic flux. The configuration is known as a configuration in which a high voltage can be obtained by increasing the number of magnetic pole pieces and increasing the number of permanent magnets.
In this product, multipolarization is equivalent to impairing compactness. To achieve compactness and further increase the output without driving the bicycle at a higher speed, the hub dynamo is used as an axle. It is assumed that the configuration is long in the direction, that is, the configuration is such that the pole piece is long in the axle direction, and the magnetic flux from the permanent magnet received by the pole piece is increased. However, if the pole piece is made too long, there is a problem that magnetic saturation occurs at the base end side portion of the pole piece and an effective magnetic flux cannot be secured for the coil body. In addition, since the pole pieces are elongated in the direction of the axle, the opposing areas of the pole pieces of different polarities increase, and the distance between the opposing poles becomes narrow and the armature reaction increases as the diameter is reduced. .

Therefore, it has been proposed to prepare a plurality of coil bodies each having a bipolar iron core as described above, and to arrange these coil bodies in parallel to a long axle so that each of these coil bodies can generate electric power. (For example, refer to Patent Documents 1 and 2.)
Utility Model Registration No. 2603339 Japanese Patent Laid-Open No. 08-192784

  In Patent Documents 1 and 2, since the length of the pole piece constituting the iron core in the axle direction can be shortened, the problems of magnetic saturation and armature reaction can be reduced. As the number increases, it is necessary to provide a pair of iron cores arranged for each coil body, and there is a problem that weight reduction is impaired, and pole pieces of different poles are closely opposed to each other. Therefore, an armature reaction occurs, and there remains a problem that generation of cogging load and power loss cannot be reduced, and there is a problem to be solved by the present invention.

The present invention has been made in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is a hub dynamo including a stator and a rotor, and includes an axle. The stator on the side includes a coil body and an iron core formed with a plurality of magnetic pole pieces that are magnetized to either the N or S pole by receiving the magnetic flux of the permanent magnet provided on the rotor side from the outer peripheral edge of the ring plate. The stator includes a main coil portion in which a pair of iron cores having different polarities are arranged on both sides of the coil body, and a single-pole first sub iron core adjacent to one of the main coil portions. A first subcoil portion disposed on one side of the coil body and a second subcoil portion adjacent to the other side of the main coil portion and having a single-pole second subcore disposed on the other side of the coil body are provided. It is what has been.
And by doing in this way, about the coil part distribute | arranged on both sides of the main coil part, a monopolar iron core may be sufficient, and it can achieve not only compactness but weight reduction, and also armature reaction Can be reduced.
According to a second aspect of the present invention, in the first aspect, the first sub iron core has the same polarity as the one side main iron core of the main coil body, and the second sub iron core has the same polarity as the other side main iron core of the main coil body. In this way, a high-power hub dynamo can be obtained.
According to a third aspect of the present invention, in the first or second aspect, the magnetic pole pieces of the first and second secondary iron cores can be formed to be approximately half the length of the magnetic pole pieces of the main iron core. By doing so, not only the diameter can be reduced but also the size can be reduced.
According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the windings of the first and second auxiliary coil bodies are set to substantially half the windings of the main coil body. is there.

By setting it as invention of Claim 1, it can be set as a high-performance hub dynamo.
By setting it as invention of Claim 2, it can be set as a high output hub dynamo.
By setting it as invention of Claim 3, both diameter reduction and compactification can be achieved.
According to the invention of claim 4, it can be configured to have the same performance as the conventional type.

Next, a first embodiment of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes an axle that constitutes the center of rotation of a front wheel (front wheel) H of a bicycle, and both left and right ends of the axle 1 are supported by tip ends of a pair of left and right front forks 2 that constitute a vehicle body. A hub dynamo 3 in which the present invention is implemented is disposed on an axle 1 located between the left and right front forks 2.
Reference numeral 4 denotes a headlamp connected to receive power from the hub dynamo 3 so as to light up.

  Reference numeral 5 denotes a casing (hub) that constitutes the rotor of the hub dynamo 3. The casing 5 is formed at a cylindrical main body 5a that fits the axle 1 and at both axial ends of the main body 5a. It comprises a pair of left and right end brackets 5b that are integrally arranged in a state of covering the cylinder opening. Each of the end brackets 5b is configured using a ring-shaped plate material, and is configured to be respectively supported via a bearing 5c with respect to the outer periphery of the spacer 1a that is integrally fitted to the axle 1. As a result, the casing 5 is configured to be rotatable relative to the axle 1. Further, the main body 5a is formed with flanges 5d that are located at both ends in the axial direction and project toward the outer diameter side, and a plurality of connecting holes 5e are formed in the flange 5d in the circumferential direction. The inner diameter side ends of the spokes 6 constituting the front wheel H are integrally connected to the connection holes 5e. Reference numeral 7 denotes a retaining member provided at both end portions on the outer side in the axial direction of the pair of left and right end brackets 5b.

  Further, in the casing 5, a cylindrical yoke 8 is integrally disposed on the inner peripheral surface of the main body 5a, and the N pole and the S pole are formed on the inner peripheral surface of the yoke 8 so as to be long in the axial direction. A plurality of pairs of permanent magnets 8a are fixedly arranged in a circumferential direction. Here, in this embodiment, fourteen pairs, that is, for convenience, twenty-eight permanent magnets 8a are provided on the inner periphery of the yoke 8, and the front wheels H rotate by rotating the front wheels H as the bicycle travels. At the same time, the casing 5 (the main body 5a and the end bracket 5b) is rotated with respect to the axle 1 so that the permanent magnet 8a on the inner peripheral surface of the main body 5a is rotated with respect to the axle 1.

On the other hand, the axle 1 that constitutes the stator that is internally provided with the casing 5 is provided with a main coil portion 9 located in the center portion. The main coil body 9a constituting the main coil portion 9 is configured by winding a winding 10 around a coil bobbin 9b, and the main coil body 9a is externally fitted to the axle 1 via a pipe material 11a. It is set so as to be integrally fitted to a main coil core 11 formed in a cylindrical shape with a magnetic member. A pair of left and right (for N and S poles) main coil cores (main iron core of the present invention) 12 for forming a magnetic path is formed on the left and right sides (both sides in the axial direction of the axle 1) of the main coil body 9a. , 13 are provided. The main coil cores 12, 13 are symmetrical to each other, and ring-shaped ring-shaped portions 12a, 13a along the side of the main coil body 9a, and the ring-shaped Magnetic pole pieces 12b and 13b which are bent and extended from the outer peripheral edge portions of the portions 12a and 13a to the main coil body 9a side. The main coil cores 12 and 13 are provided such that the ring-shaped portions 12 a and 13 a are abutted against both axial end surfaces of the main coil core 11.
Here, each of the main coil cores 12 and 13 of the present embodiment has fourteen magnetic pole pieces 12b and 13b formed in the circumferential direction, and the magnetic pole pieces 12b and 13b are arranged around each other. They are arranged in a positional relationship that shifts in the rotational direction. Accordingly, the twenty-eight magnetic pole pieces 12b and 13b arranged on the outer periphery of the main coil body 9a are adjacent to each other at equal intervals and in a positional relationship (a bowl shape) arranged alternately. It is arranged so as to face each other.

A first subcoil portion 14 is provided on the left side (one side of the present invention) of the main coil portion 9, and a second subcoil portion 15 is provided on the right side (the other side of the present invention). Thus, the stator of the hub dynamo 3 is configured.
The first subcoil body 14a constituting the first subcoil portion 14 is configured by winding the winding 10 around the coil bobbin 14b. In this case, the length of the first subcoil bobbin 14b in the axle direction is as follows. The number of turns of the winding 10 to the first sub-coil bobbin 14b is approximately the number of turns of the winding 10 to the main coil bobbin 9b. It is set to half. The first subcoil body 14a is integrally fitted on a cylindrical first subcoil core 16 formed of a magnetic member that is fitted on the axle 1 via a pipe member 16a. A first secondary coil iron core (first secondary iron core of the present invention) 17 is provided on the left side (one side) of the first secondary coil body 14a. It has the same configuration as the left main coil core 12 disposed in the main coil portion 9, and has a ring-shaped portion 17 a that abuts against the left end surface of the first subcoil core 16, and the outer peripheral edge to the right side. And fourteen magnetic pole pieces 17b bent and extended toward the surface. Here, the left and right lengths of the magnetic pole pieces 17b of the first secondary coil iron core 17 of the present embodiment are set to be approximately half the left and right lengths of the magnetic pole pieces 12b of the main coil iron core 12. Further, the first auxiliary coil core 17 has the axle 1 in a state in which each magnetic pole piece 17b is synchronized with the magnetic pole piece 12b of the main coil core 12 positioned on the left side of the main coil portion 9 (same in the circumferential direction). And are set to have the same polarity.

  On the other hand, the second subcoil body 14a constituting the second subcoil portion 15 is configured by winding the winding 10 around the coil bobbin 15b. The length of the second auxiliary coil bobbin 15b in the axial direction of the second auxiliary coil bobbin 15b is set to be approximately half of the length of the main coil bobbin 9b of the main coil portion 9 in the axial direction, and the winding 10 to the second auxiliary coil bobbin 15b. Is set to approximately half the number of turns of the winding 10 to the main coil bobbin 9b in the main coil portion 9. The second secondary coil body 15a is set so as to be integrally fitted on a cylindrical second secondary coil core 18 formed of a magnetic member fitted on the axle 1 via a pipe member 18a. Has been. A second secondary coil iron core (second secondary iron core) 19 is provided on the left side (one side) of the second secondary coil body 15a. The second secondary coil iron core 19 is composed of the main coil portion. 9 is configured in the same manner as the right-side main coil core 13 disposed in the ring 9, and a ring-shaped portion 19a that abuts on the left end surface of the second sub-coil core 18, and from the outer peripheral edge portion toward the right side. Fourteen pole pieces 19b that are bent and extended are provided. Further, the left and right lengths of the magnetic pole pieces 19b of the second auxiliary coil iron core 19 of the present embodiment are set to be approximately half the left and right lengths of the magnetic pole pieces 13b of the main coil iron core 13. Here, the iron core 19 for the second subcoil is an axle in a state where each magnetic pole piece 19b is synchronized with the magnetic pole piece 13b of the main coil iron core 13 located on the right side of the main coil portion 9 (same in the circumferential direction). 1 and is set to have the same polarity.

And in the stator comprised in this way, the casing 5 is rotated and the 14 pairs of permanent magnets 8a provided in the inner periphery of the yoke 8 are made into the main coil part 9, the 1st, 2nd subcoil part 14,15. It was confirmed that electric power was generated (power generation) in the coil bodies 9a, 14a, and 15a of the main coil portion 9, the first and second sub-coil portions 14 and 15, respectively, with each rotation.
Therefore, a power generation mechanism in this apparatus will be described with reference to FIGS.

That is, with respect to the permanent magnet 8a on the casing 5 side, the magnetic pole pieces 12b, 13b, 17b, and 19b of the iron cores 12, 13, 17, and 19 for the main coil and the first and second auxiliary coils are for the main coil. When the magnetic pole pieces 12b and 17b of the left iron core 12 and the first auxiliary coil iron core 17 are opposed to the N pole, the magnetic pole pieces 13b and 19b of the main coil right iron core 13 and the second auxiliary coil iron core 19 are respectively S. Opposite the pole. The magnetic pole pieces 12b, 13b, 17b and 19b are alternately magnetized to the N pole and the S pole every time the yoke 8 together with the casing 5 rotates by one pitch angle (360/28 ° C.) based on the rotation of the front wheel H. Has been.
Accordingly, as shown in FIG. 3, the magnetic pole pieces 12b and 17b of the main coil left iron core 12 and the first auxiliary coil iron core 17 respectively face the south pole, and the main coil right iron core 13 and the second auxiliary coil. When the magnetic pole pieces 13b and 19b with the iron core 19 are in the first magnetization state facing the N pole, the main coil core 9 is connected to the main coil core 11 from the main coil right core pole piece 13b magnetized to the N pole. , A clockwise main magnetic path to the main coil left core pole piece 12b magnetized to the S pole is formed, and a positive magnetic flux passes through the main coil body 9a.
At the same time, the left core for the main coil magnetized to the S pole from the core pole piece 19b for the second subcoil magnetized to the N pole via the core 11 for the main coil via the core 18 for the second subcoil. A second secondary magnetic path in the clockwise direction reaching the magnetic pole piece 12b is formed, so that it is assumed that the magnetic flux in the positive direction also passes through the second secondary coil body 15a.
Furthermore, at this time, the second subcoil magnetized to the S pole from the right coil core pole piece 13b for the main coil magnetized to the N pole via the core 11 for the main coil and the core 16 for the first subcoil. A clockwise first sub magnetic path to the iron core pole piece 17b is also formed, and it is assumed that a magnetic flux in a positive direction also passes through the first sub coil body 14a.

  On the other hand, the magnetic pole pieces 12b and 17b of the left iron core 12 for the main coil and the iron core 17 for the first auxiliary coil face the N pole, and the magnetic pole pieces of the right iron core 13 for the main coil and the iron core 19 for the second auxiliary coil. In the case of the second magnetization state in which 13b and 19b are opposed to the S pole, the main magnetic path in the counterclockwise direction is formed contrary to the above, and the first sub magnetic path and the second sub magnetic path are formed, respectively. (See FIG. 4 (A)), and as a result, a negative direction magnetic flux passes through each coil body 9a, so that the first and second auxiliary coil bodies 14a and 15a are also negative. In this way, the first magnetization state and the second magnetization state are alternately repeated, so that not only the main coil body 9a but also the first and second sub-coil bodies 14a and 15a Are considered to generate electricity, and in fact, each of these coil bodies 9 , 14a, the result of observation is taken out of power generated in 15a, the power of high voltage can be obtained was confirmed.

  The hub dynamo 20 shown in FIG. 4 (B) prepares two coil portions 21 having the same configuration as the main coil portion 9 of the above-described embodiment as a stator. Conventionally, among the pair of iron cores 22 of the coil portion 21, the adjacent iron cores 22 are provided in parallel with the axle with the same poles, and housed in the yoke 8 similar to the above embodiment. It is of type structure. In this case, when the number of windings of each coil portion 21 is 1, and the amount of magnetic flux received by each iron core 22 from each permanent magnet 8a is 1, the winding 10 in the main coil portion 9 in the present embodiment. The number of turns is 1, and the number of turns of the winding 10 of the first and second auxiliary coils 14 and 15 is 0.5. And in this thing, as above-mentioned, the 1st, 2nd subcoil cores 17 and 19 of the 1st and 2nd subcoil 14 and 15 are respectively for the left and right main coil of the main coil part 9. Since it is provided in synchronization with the iron cores 12 and 13, the amount of magnetic flux in the first and second subcoil portions 14 and 15 is 0.5, while the amount of magnetic flux in the main coil portion 9 is 1 As a result, it is predicted that the present embodiment has the same output performance as that of the conventional structure, and it was confirmed that the output was the same as the actual measurement value. .

In the embodiment of the present invention configured as described, the hub dynamo 3 is reduced in diameter by providing the main coil portion 9, the first and second auxiliary coil portions 14, 15 in parallel with the axle 1. However, in this case, as the iron cores for forming the magnetic paths of the first and second auxiliary coil portions 14 and 15 adjacent to the main coil portion 9, each of them is a single pole. The first and second subcoil cores 17 and 19 are used, and the first and second subcoil cores 17 and 19 are synchronized with the left and right main coil cores 12 and 13 of the main coil portion 9, respectively. It is the structure provided in the state to do. As a result, the main coil core pole pieces 12b and 13b are close to each other in the main coil portion 9 so that the armature reaction occurs. However, in the first and second auxiliary coil portions 14 and 15, a single pole first Since the second auxiliary coil iron cores 17 and 19 exist, the armature reaction does not occur, the armature reaction of the hub dynamo 3 as a whole can be reduced, and the cogging load can be prevented. It is possible to provide a high-performance hub dynamo 3 that can reduce power loss and efficiently secure power.
In addition, in this case, the first and second auxiliary coil portions 14 and 15 are formed to be half the length in the axle direction of the main coil portion 9, and the first and second auxiliary coil cores 17 and 19 are formed. Since each of the pole pieces 17b and 19b has a length in the axle direction that is half that of the main coil iron cores 12 and 13, the weight reduction is achieved. It is possible to realize a light weight and a compact size.

  Of course, the present invention is not limited to the above embodiment, and the first and second sub-cores, which are the iron cores of the sub-coil portions provided on the left and right of the main coil portion, are the first sub-cores. May be configured to synchronize with the iron core on the other side of the main coil portion, and the second sub iron core may be synchronized with the iron core on one side of the main coil portion. It is possible to generate electricity.

It is a partial side view of the front wheel of a bicycle. It is front sectional drawing of a hub dynamo. It is sectional drawing explaining the magnetic path in a hub dynamo. 4A and 4B are a cross-sectional view for explaining the magnetic path of the hub dynamo in the present embodiment, and a cross-sectional view for explaining the magnetic path of the hub dynamo in the conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axle 2 Front fork 3 Hub dynamo 5 Casing 8a Permanent magnet 9 Main coil part 9a Main coil body 10 Winding 12 Main coil core 12b Magnetic pole piece 14 First subcoil part 15 Second subcoil part 17 For first subcoil Iron core 19 Iron core for second subcoil

Claims (4)

  A hub dynamo having a stator and a rotor, wherein the stator on the axle side receives the magnetic flux of the coil body and the permanent magnet provided on the rotor side from the outer peripheral edge of the ring plate, and is either N or S pole The stator includes a main coil portion in which a pair of iron cores having different polarities are arranged on both sides of the coil body, and the main coil portion. A first subcoil part having a monopolar first secondary iron core disposed on one side of the coil body, and a second secondary iron core having a single pole adjacent to the other of the main coil part. A hub dynamo provided with a second auxiliary coil portion arranged on the other side.   2. The hub according to claim 1, wherein the first sub iron core has the same polarity as the one side main iron core of the main coil body, and the second sub iron core has the same polarity as the other side main iron core of the main coil body. Dynamo.   3. The hub dynamo according to claim 1 or 2, wherein the pole pieces of the first and second secondary iron cores are formed to be approximately half the length of the pole pieces of the main iron core.   4. The hub dynamo according to claim 1, wherein the winding of the first and second sub-coil bodies is set to substantially half of the winding of the main coil body.

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