JP2006067681A - Permanent magnet generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet generator in which magnetmotive forces are induced, in good balance, in a plurality of coils having two types or more of different use and winding of coil wire is facilitated. <P>SOLUTION: The permanent magnet generator 1 comprises a cylindrical rotor 2 provided with a permanent magnet 22 on the inner side face, and a stator 3 provided on the inside of the rotor 2 wherein the stator 3 is constituted of a plurality of salient poles 32 arranged radially from the center of rotation 20 of the rotor 2, a bobbin 33 fixed to the salient poles 32, and a coil 4 formed by winding a coil wire around the bobbin 33. Coils having a common use among the coils 4 are arranged at radial positions while being spaced apart equally from the center of rotation 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a permanent magnet generator such as a flywheel magneto mounted on a motorcycle or the like, and more specifically, a permanent magnet generator in which a plurality of coils having two or more different uses are radially arranged. It is about.

  Generally, a permanent magnet generator mounted on a vehicle such as a motorcycle is connected to a crankshaft and rotates in conjunction with an engine, and is disposed on the rotation center side of the rotor and fixed to the vehicle body side. It consists of a stator.

  The rotor is cylindrical, and a permanent magnet is attached to the inner wall surface. The stator includes a core disposed on the rotation center of the rotor, and a plurality of coils arranged radially projecting outward from the outer peripheral surface of the core. These coils are formed by winding a coil wire around a bobbin fitted to a salient pole portion protruding radially outward from a core. These plural coils are usually used for two or more kinds of applications, for example, some coils are used for battery charging and other coils are used for lamp lighting.

  In the permanent magnet generator configured as described above, the rotor rotates as the engine is driven, and an alternating current is induced in each coil to generate power. The electric power generated by the battery charging coil is charged into the battery via the rectifier, and the electric power generated by the lamp lighting coil is used for lighting the lamp while maintaining an alternating current.

  Such a permanent magnet generator includes a rotor and a stator, and the stator includes, for example, 12 salient pole portions and a coil 4 having two kinds of uses for lamp lighting and battery charging. Yes.

  FIG. 5 shows a conventional winding method of the coil 4 in the generator 1 of FIG. In the actual generator, the coils 4 arranged radially are displayed in a row in this figure, and the coils are shown as adjacent in alphabetical order of 4A to 4L. First, twelve coils 4 </ b> A to 4 </ b> L are wound with one coil wire 41 so that the winding directions of adjacent coils are opposite to each other. Thereafter, of the 12 coils 4A to 4L, for example, 3 coils 4J, 4K, and 4L are separated from the other 9 coils 4A to 4I for charging the battery, and the other 9 coils 4A to 4I are The tip of the coil wire 41 is attached to the taps 5a, 5b, and 5c so as to be connected for lamp lighting.

  However, the amount of current that flows usually differs between coils used in different applications. Moreover, the amount of current flowing through the coil differs when the battery is in a fully charged state and when it is not. Thus, when the amount of current flowing through each coil is different, the magnetomotive force generated in the coil is biased.

  FIG. 6 shows the magnitude of the magnetomotive force generated in each of the coils 4A to 4L in FIG. 5 by arrows. Since the magnetomotive forces of the other lamp charging coils 4A to 4L are larger than the magnetomotive forces of the battery charging coils 4J, 4K, and 4L concentrated in the upper left part of FIG. The sum of the magnetomotive force vectors generated in 4L becomes a vector in the lower right direction in FIG. 6 and is eccentric with respect to the rotation center 20 of the rotor 2, and thus vibration in the radial direction occurs. When this vibration is large, engine parts vibrate through the rotor 2 to generate noise, and the durability of the engine parts is reduced.

  Therefore, in order to solve the above problem, as shown in Patent Document 1, a battery charging coil wire is overlapped and wound around a part of a lamp lighting coil.

  However, in this case, when the lamp lighting coil is wound for the first time, a crossover between the end of winding of each coil and the start of winding of the adjacent coil is stretched between the coils. The connecting wire may interfere with the next winding of the battery charging coil. For this reason, a battery charging coil that is wound later is difficult to wind and winding disturbance may occur. If the number of windings is reduced due to turbulence, sufficient performance cannot be exhibited. The same applies to the case where the lamp lighting coil is wound later.

Even in this case, since the amount of current flowing through the battery charging coil differs between when the battery is charged and when the battery is fully charged, the bias of the magnetomotive force does not disappear.
JP-A-7-95753

  The present invention is based on the above-described prior art, and is a permanent magnet generator in which the magnetomotive force generated in a plurality of coils having two or more different uses is well balanced and the coil wire can be easily wound. For the purpose of provision.

  The invention of claim 1 comprises a cylindrical rotor having a permanent magnet on its inner surface and a stator provided inside the rotor, and the stator is arranged radially from the center of rotation of the rotor. In a permanent magnet generator composed of a plurality of salient pole parts, a bobbin attached to the salient pole part, and a coil formed by winding a coil wire around the bobbin, a common application among the coils is used. The coils are arranged at radial positions at equal intervals with respect to the center of rotation.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a coil having a common use is continuously wound by a single coil wire.

  According to a third aspect of the present invention, the bobbin has a flange on the distal end and the proximal end side, a groove is provided on a surface of the proximal end flange on the coil winding side, and includes a coil wire between the coils. The line is locked in the groove.

  According to the first aspect of the present invention, a plurality of coils having a common application are arranged at radial positions at equal intervals with respect to the rotation center, so that the magnetomotive force vector is canceled for each coil of each application. The Therefore, the balance of the magnetomotive force with respect to the rotation center is improved, the vibrations of the generator and engine parts are reduced, and no noise is generated.

  According to the second aspect of the present invention, it is not necessary to cut or connect the coil wires, and the coil can be easily formed.

  According to the third aspect of the present invention, since the connecting wire of the coil wound earlier is placed in the groove, the connecting wire does not get in the way on the bobbin when the coil is wound next time. Therefore, all the coils can be easily aligned and wound with a sufficient number of turns.

  The permanent magnet generator of the present invention is mounted on a vehicle such as a motorcycle, and generates AC power necessary for the vehicle using the rotational force of the engine as a drive source.

  FIG. 1 is a front view of a generator 1 according to the present invention. The generator 1 includes a cylindrical or saddle-shaped rotor 2 that is mounted on a crankshaft (not shown) of an engine and is driven to rotate in conjunction with the engine, and a stator 3 that is attached to a non-rotating part of the vehicle body. . The rotor 2 includes a holder 21 having a cylindrical side wall and a plurality of permanent magnets 22 attached to the inner wall surface of the holder 21 in the circumferential direction. A plurality of permanent magnets 22 are arranged at equal intervals in the circumferential direction with appropriate intervals.

  The stator 3 is disposed on the inner side of the rotor 2, the core 31 is disposed on the rotation center 20 of the rotor 2, and is disposed radially with the core 31 so as to extend outward from the outer peripheral surface of the core. A plurality of salient pole portions 32, a bobbin 33 attached to the salient pole portion 32, and a coil 4 formed by winding a coil wire around the bobbin 33.

  When the engine starts, the rotor 2 rotates together with the crankshaft, and the permanent magnet 22 attached to the rotor 2 rotates on the outer periphery of the stator 3, so that an electromotive force is generated between the rotor 2 and the stator 3. Is generated, and a power generation effect is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the generator 1 has coil wires wound around bobbins 33 mounted on twelve salient pole portions 32 arranged radially from the rotation center 20 to form a coil 4. Yes.

  FIG. 2 shows the winding order of the coil wire 41 according to the present invention. In this embodiment, of the 12 coils 4A to 4L, 9 coils 4A to 4C, 4E to 4G, and 4I to 4K are used for lamp lighting for supplying power to the lamp, and the remaining three coils A case where the coils 4D, 4H, and 4L are used for charging a battery that serves as a power source of the engine or at the time of engine ignition is shown. In an actual generator, coils are arranged radially as shown in FIG. 1, but in FIG. 2, they are displayed in a vertical line for convenience. Coils 4A to 4L are adjacent in alphabetical order.

  First, a lamp lighting coil is wound around the first round. Winding is started in order from the coil 4A, and adjacent coils are wound with their winding directions reversed. The coil wire 41 having the base end connected to the tap 5a is continuously wound around the three portions of the coils 4A, 4B, and 4C, and one salient pole portion is skipped, and the three portions of the coils 4E, 4F, and 4G are continuously connected. Then roll it up. Further, one portion is skipped, and the three portions of the coils 4I, 4J, and 4K are continuously wound, and the tip of the coil wire 41 is connected to the tap 5b. Next, as the second turn, a battery charging coil is wound. Three coil 4D, 4H, 4L which was not wound in the 1st round is wound in order with another coil wire 41 which connected the base end to tap 5c, and the tip is connected to tap 5b.

  FIG. 3 is an enlarged cross-sectional view of the coil 4 portion. The salient pole portion 32 is formed of a multilayer plate in which a plurality of thin plates made of a magnetic material are stacked. The bobbin 33 is made of an insulating material such as synthetic resin, and is fitted into the outer periphery of the salient pole portion 32. The bobbin 33 has a flange 34 on the proximal end side and the distal end side, and a groove 35 is formed on the inner side (coil winding side) of the flange 34 on the proximal end side.

  When the coil wire 41 is wound around one bobbin 33, the adjacent salient pole part is skipped. For example, in the example of FIG. 2, the coil 4C is skipped to the coil 4D and then the coil 4E is skipped. Coil 4I-4K is skipped and coil wire 41 is passed to coil 4L. Since the jumping part 42 of the skipped part passes on the bobbin of the skipped salient pole part, it becomes an obstacle. In the present embodiment, the connecting wire 42 is hooked on the groove 35 of the bobbin, and the coil wire 41 is wound around the next bobbin 33. When nine coils are wound in the first turn, the connecting wire 42 between two separate coils that are continuously wound with a coil for another purpose interposed therebetween is locked in the groove 35 in this way. Thus, when the coil is wound around the bobbin through which the connecting wire 42 passes, the connecting wire 42 between the coils prevents the coil wire 41 from becoming difficult to wind. The connecting wire 42 locked in the groove 35 is pulled toward the rotation center 20 by the tension generated by coil winding. For this reason, the crossover wire 42 is pressed against the flange 34 on the proximal end side, so that it does not require a fixing member or the like and is locked without coming off from the groove 35.

  Therefore, since the connecting wire 42 between the coils wound in the first round does not interfere with the winding of the coil in the second round, any coil can be wound in an accurate manner.

  FIG. 4 shows the magnetomotive force generated in each of the coils 4A to 4L by arrows in the stator 3 in which the coils 4A to 4L are wound in the order shown in FIG.

  Since the battery charging coils 4D, 4H, and 4L are arranged at an equally spaced angle of 120 degrees with respect to the rotation center 20, the sum of the magnetomotive force vectors of the coils 4D, 4H, and 4L becomes zero. Become. Further, the lamp lighting coils 4A, 4B, 4C, 4E, 4F, 4G, 4I, 4J, and 4K arranged at positions excluding the battery charging coils 4D, 4H, and 4L are also rotated as three groups. Since they are arranged radially at equal intervals with respect to the center 20, the sum of the respective magnetomotive force vectors becomes zero. Therefore, even if the magnitude of the magnetomotive force varies depending on the use of the coil, the magnetomotive force is decentered and the stator 3 does not vibrate. Therefore, noise and the like are not generated, and engine parts are not affected.

  The number of salient pole portions 32 is not limited to twelve as described above, and the use of power is not limited to two types. Further, the number of coils 4 used for each application is appropriately determined as necessary, and in any case, the coils 4 are arranged at equal intervals with respect to the rotation center 20 for each application.

  The present invention can be applied to a permanent magnet generator connected to a crankshaft of a vehicle having an engine.

The front view of the generator which concerns on this invention. Explanatory drawing which shows the winding method of the coil of the generator of this invention. The expanded sectional view of the coil part of this invention. Explanatory drawing of the magnetomotive force which generate | occur | produces in each coil of FIG. Explanatory drawing which shows the winding method of the coil of the conventional generator. Explanatory drawing of the magnetomotive force which generate | occur | produces in each coil of FIG.

Explanation of symbols

1: Generator, 2: Rotor, 3: Stator, 4, 4A, 4B, 4C, 4D, 4E, 4F, 4G, 4H, 4I, 4J, 4K, 4L: Coil, 5a, 5b, 5c: Tap , 20: rotation center, 21: holder, 22: permanent magnet, 31: core, 32: salient pole part, 33: bobbin, 34: collar part, 35: groove, 41: coil wire, 42: crossover.

Claims (3)

  The rotor includes a cylindrical rotor having a permanent magnet on the inner surface and a stator provided inside the rotor, and the stator includes a plurality of protrusions arranged radially from the rotation center of the rotor. In the permanent magnet generator comprising a pole portion, a bobbin attached to the salient pole portion, and a coil formed by winding a coil wire around the bobbin, a coil having a common use among the coils Are arranged at radial positions at equal intervals with respect to the center of rotation.   The permanent magnet generator according to claim 1, wherein the coil having the common use is continuously wound by a single coil wire. The bobbin has a flange portion at the distal end and the proximal end side, and a groove is provided on a surface of the flange portion on the proximal end side on the coil winding side. The permanent magnet generator according to claim 2, wherein the permanent magnet generator is engaged with the permanent magnet generator.

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