JP2006101612A - Magneto-generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To incorporate permanent magnets for power generation into a core and prevent the exposed portions of the permanent magnets from becoming rusted, while preventing magnetic short-circuiting in the permanent magnets. <P>SOLUTION: The core 4 with a power generation coil 8 as an exciter coil for ignition wound on it is placed at a position opposite to the circumferential surface of a rotor 1 typified by a flywheel. The permanent magnets 10 are inserted into cut holes, formed in the magnetic poles 5 and 7 of the core 4. At least one inductor 11, that forms the magnetic path of magnetic flux produced by the permanent magnets 10, is provided on the circumferential surface of the rotor 1. A resin cover 20 is attached that includes a magnet cover that covers the exposed portions of the permanent magnets 10, and a coil case that houses the exciter coil 8. The exciter coil 8 attached to the core 4 and the permanent magnets 10 are sealed with resin, in a process in which the resin cover 20 is molded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnet power generator, and more particularly to a magnet power generator suitable as a power source for an ignition device used for a relatively small engine or a battery charging or lighting device.

In an ignition device used for a relatively small engine or a power generation device for charging a battery or a lighting device, an arcuate shape is formed along the inner peripheral surface of the edge of the bottomed cylindrical (saddle-shaped) flywheel. There is known a magnet power generation device in which a permanent magnet formed on the inner surface is attached by an appropriate joining means such as screwing or bonding, and an iron core and a power generation coil are arranged on the inner peripheral side of the permanent magnet (for example, Japanese Patent Publication No. 61-25347). Publication).
Japanese Patent Publication No. 61-25347

  In a flywheel magnet power generator as described in Patent Document 1, a permanent magnet is attached to a flywheel that rotates at a high speed.

  Moreover, in order to obtain a large power generation output, it is necessary to increase the number of permanent magnets to increase the magnetic flux change in the power generation coil for each rotation of the flywheel, and the number of operations for attaching permanent magnets is further increased. There is a problem that it takes time and effort.

  This invention is made | formed with respect to this problem, and it aims at providing the magnet electric power generating apparatus which can obtain an electric power generation output, without attaching a permanent magnet to the flywheel side.

  The present invention relates to a magnet power generator that generates electric power by rotating a rotor, an iron core that is disposed by winding a power-generating coil at a position facing a circumferential surface of the rotor, and a notch formed in the iron core. A permanent magnet, at least one inductor that is provided on the peripheral surface of the rotor and forms a magnetic path of magnetic flux generated by the permanent magnet, and a resin cover that covers an exposed portion of the permanent magnet. There is a first feature.

  In addition, the present invention has a second feature in that the resin cover includes a coil case portion that houses the power generation coil and a magnet cover portion that is formed integrally with the coil case portion.

  Further, the present invention has a third feature in that, in the step of forming the resin cover, the power generating coil and the permanent magnet mounted on the iron core are sealed with resin.

  Further, according to the present invention, a part of the exposed portion of the permanent magnet is covered with one surface of a support member that supports the iron core, the remaining portion of the exposed portion is covered with the resin cover, and the iron core is covered with the resin. There is a fourth feature in that it is fixed to a support member that supports the iron core via a cover.

  In addition, the present invention has a fifth feature in that the magnet cover portion is formed in a cylindrical shape surrounding the iron core on which the permanent magnet is mounted.

  According to the present invention having the first feature described above, the flywheel only needs to be provided with an inductor, so that the configuration becomes very simple. In addition, since the exposed portion of the permanent magnet mounted in the iron core can be covered with a resin cover, it is possible to prevent the intrusion of moisture that causes rust of the magnet, and since the resin cover is used, the permanent magnet Magnetic shorts can also be prevented.

  According to the second feature, since the permanent magnet can be integrally formed with the coil case portion, the magnet cover portion can be formed, so that the permanent magnet can be sealed with the magnet cover portion by attaching the coil case portion. .

  According to the third feature, since the power generation coil and the permanent magnet attached to the iron core can be sealed in the resin cover molding step, the work of attaching the resin cover to the iron core is omitted.

  According to the fourth feature, it is not necessary to cover the entire exposed portion of the permanent magnet with the resin cover, and the exposed portion may be partially covered, so that the shape of the resin cover can be simplified.

  According to the fifth feature, since the resin cover has a shape surrounding the magnetic pole, it is easy to secure the resin cover to the magnetic pole.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a main configuration of an ignition device according to an embodiment of the present invention. In FIG. 1, a rotor 1 is, for example, a flywheel connected to a crankshaft 2 of an engine (not shown), and rotates in a direction indicated by an arrow R in synchronization with the rotation of the engine. An exciter 3 is disposed at a position facing the outer peripheral surface of the rotor 1.

  The iron core 4 of the exciter 3 has three magnetic poles 5, 6, 7 having one end connected to each other and the other end opened to form an alphabet “E” shape as a whole. The iron core 4 is configured by laminating a plurality of electromagnetic steel sheets punched into the “E” shape. On the magnetic pole 6 at the center of the iron core 4, a power generation coil, that is, an exciter coil 8 as an ignition power generation coil is wound through a bobbin 9 made of an insulating material.

  Permanent magnets 10 are embedded near the tips of the magnetic poles 5, 7, that is, near the outer peripheral surface of the rotor 1. A hole into which the permanent magnet 10 can be inserted, that is, a notch hole, is simultaneously formed when the electromagnetic steel sheet constituting the iron core 4 is punched, and the permanent magnet 10 is fitted from the front into the formed hole after the steel sheets are laminated. The permanent magnet 10 is desirably a rare earth magnet such as Nd—Fe—B (neodymium-iron-boron). The permanent magnets 10 and 10 incorporated in the magnetic poles 5 and 6 are arranged so that their polarities are in the opposite directions. For example, the permanent magnet 10 in the magnetic pole 5 has an S pole on the side close to the rotor 1 and the N pole on the side far from the rotor 1, while the permanent magnet 10 in the magnetic pole 7 has an S pole on the side far from the rotor 1. The side close to the rotor 1 is the N pole.

  An inductor 11 made of a magnetic plate is fixed to the outer peripheral surface of the rotor 1. The inductor 11 is connected between the magnetic poles 5 and 6 or between the magnetic poles 6 and 7 according to the position of the rotor 1, and magnetic fluxes Φ1 and Φ2 by the permanent magnet 10 (magnetic flux Φ2 will be described later with reference to FIG. 2). Form a road. The inductor 11 is set to the length shown in FIG. 1 so that the open magnetic path between the magnetic poles 5 and 6 or between the magnetic poles 6 and 7 does not simultaneously become a closed magnetic path.

  FIG. 2 is a front view of the ignition device in the second position. In FIG. 2, the rotor 1 rotates in the direction of arrow R from the first position shown in FIG. 1, and the inductor 11 reaches the second position facing the magnetic poles 6 and 7. When the inductor 11 is in this second position, the permanent magnet 10 embedded in the magnetic pole 7 forms a magnetic flux Φ 2 that passes through the magnetic pole 7, the inductor 11, and the magnetic pole 6.

  As described with reference to FIGS. 1 and 2, the directions of the magnetic fluxes Φ <b> 1 and Φ <b> 2 passing through the exciter coil 8 are opposite to each other due to the arrangement of the polarities of the permanent magnets 10 and 10. Therefore, the direction and the number of magnetic fluxes passing through the exciter coil 8 vary depending on the position of the inductor 11 relative to the iron core 4, that is, the rotational position of the rotor 1.

  FIG. 3 is a diagram illustrating an example of an ignition circuit including the exciter coil 8. In the figure, both ends of the exciter coil 8 are connected to the primary side coil T1 of the ignition coil 12. A thyristor 13 is connected between the exciter coil 8 and the primary side T1 of the ignition coil 12. Further, a rectifying diode 14 and a backflow preventing diode 15 are connected between the exciter coil 8 and the primary coil T1 of the ignition coil 12. A capacitor 17 is connected between a connection point between the thyristor 13 and the diode 14 and a connection point between the diode 15 and the primary coil T1. A gate circuit 16 is connected to the gate of the thyristor 13. The gate circuit 16 outputs a gate trigger when the voltage across the exciter coil 8, that is, the exciter voltage becomes a predetermined gate trigger voltage. The gate trigger causes the thyristor 13 to conduct, and a primary voltage is applied to the primary coil T1 of the ignition coil 12 by the accumulated charge of the capacitor 17. The secondary coil T2 of the ignition coil 12 is connected to an engine spark plug 18. A high voltage corresponding to the winding ratio is induced in the secondary coil T2 by the current flowing through the primary coil T1.

  FIG. 4 is a timing chart showing the operation of the ignition circuit. The operation of the ignition circuit will be described with reference to FIG. When the crankshaft 2 is rotated in a direction indicated by an arrow R in FIGS. 1 and 2 using known engine start operation means such as a starter motor or a start rope, the rotor 1 also rotates integrally.

  As the rotor 1 rotates, the inductor 11 approaches and separates from the iron core 4. Along with this, the direction and the number of magnetic fluxes in the iron core 4 change. First, as the tip of the inductor 11 in the rotational direction passes through the magnetic pole 5 and approaches the magnetic pole 6, the magnetic flux Φ1 in the magnetic pole 6 around which the exciter coil 8 is wound increases as shown in FIG. Then, when the rear end of the inductor 11 in the rotational direction moves away from the magnetic pole 6, the magnetic flux Φ1 decreases. On the contrary, since the tip of the inductor 11 approaches the magnetic pole 7, the magnetic flux Φ2 starts to increase. Then, as the rear end of the inductor in the rotational direction moves away from the magnetic pole 7, the magnetic flux φ2 decreases.

  In response to the change in the number of magnetic fluxes Φ1 and Φ2 and the direction of the magnetic flux, a counter electromotive voltage, that is, an exciter voltage V is generated in the exciter coil 8, and the exciter voltage V is as shown in FIG. It changes according to the changing speed of the number of magnetic fluxes. If the number of magnetic fluxes suddenly increases or decreases, the induced voltage is large. The capacitor 17 is charged by the positive side voltage V1 of the exciter voltage V. The gate trigger voltage of the gate circuit 16 is set to a negative voltage value Vg, and when the exciter voltage V becomes lower than the negative voltage value Vg, the gate circuit 16 triggers the gate trigger on the thyristor 13.

  FIG. 4C is a diagram showing a change in voltage of the capacitor 17. The capacitor 17 starts to be charged when the exciter voltage V turns to the positive side. When the exciter voltage V becomes lower than the negative voltage value Vg, the thyristor 13 is turned on, so that the accumulated charge of the capacitor 17 is discharged to the primary coil T1 of the ignition coil 12, and the voltage Vc of the capacitor 17 decreases ( Virtually zero).

  The ignition phase can be easily adjusted by changing the gate trigger voltage Vg or delaying the trigger signal in the gate trigger circuit 16.

  FIG. 4D is a diagram showing the secondary side voltage of the ignition coil 12. Due to the discharge of the capacitor 17, a current suddenly flows into the primary coil T1 of the ignition coil 12, and this current causes the secondary coil T2 of the ignition coil 12 to have a high secondary voltage as shown in FIG. V2 is induced. The secondary voltage V2 causes a discharge between the electrodes of the spark plug 18 to ignite the engine. This discharge releases energy in the secondary coil T2 of the ignition coil 12, and the secondary voltage V2 decreases.

  The positions of the rotor 1, the inductor 11, and the iron core 4, and the gate trigger voltage are set so that the discharge of the capacitor 17 to the primary coil T1 of the ignition coil 12 is at a time suitable for engine ignition. .

  Since the permanent magnet 10 described above is only inserted into a hole formed in the iron core 4 on which the electromagnetic steel plates are laminated, both end faces are exposed on the front surface and the back surface of the iron core 4. For this reason, it is necessary to provide a cover for covering the end surface of the permanent magnet 10 to prevent the permanent magnet from falling off or moisture from entering. 5 is a front view of an exciter provided with a cover that covers the end face of the permanent magnet 10, FIG. 6 is a side view, and FIG. 7 is a bottom view. The cover 20 is made of a resin material such as PBT (polybutylene terephthalate), and is formed integrally with a coil case that covers the exciter coil 8. The cover 20 includes a coil case portion 201 that accommodates the exciter coil 8 wound around the bobbin 9 and a magnet cover portion 202 that protrudes laterally from the coil case portion 201. As shown in FIG. 7, the magnet cover portion 202 is formed in an annular shape when viewed from the bottom, and has a rectangular shape in which at least the inner circumference surrounds the magnetic poles 5 and 7. That is, the magnetic poles 5 and 7 have a cylindrical shape surrounding the periphery of the installation position of the permanent magnet 10. In this way, both end surfaces of the permanent magnet 10 are covered with the magnet cover portions 202 surrounding the magnetic poles 5 and 7.

  The cover 20 may be molded by resin molding integrally with the iron core 4 after the bobbin 9 with the exciter coil 8 wound is inserted into the magnetic pole 6 of the iron core 4, or the cover 20 may be molded as a separate part from the iron core 4. Then, the cover 20 may be assembled to the iron core 4 in a subsequent process. According to the integral molding, the permanent magnet 10 is sealed in the iron core 4 simultaneously with the molding of the cover 20.

  A procedure for assembling the cover 20 to the iron core 4 in a later process will be described. 8 is a front view of the exciter 3 from which the cover 20, the exciter coil 8 and the bobbin 9 are removed, that is, the iron core 4 into which the permanent magnet 10 is inserted, FIG. 9 is a side view of the iron core 4, and FIG. FIG. 11 is a side view of the cover 20. As shown in FIGS. 8 and 9, the iron core 4 is prepared in a state where the permanent magnet 10 is inserted. On the other hand, as shown in FIGS. 10 and 11, a cover 20 having a bobbin 9 around which an exciter coil 8 is wound is prepared by integral molding with resin. Then, the cover 20 is assembled to the iron core 4. The magnetic pole 6 is inserted into the hole 91 of the bobbin 9 and the magnetic poles 5 and 7 are inserted into the magnet cover portion 202 so that the cover 20, the exciter coil 8 and the iron core 4 are assembled together.

  Although the cover 20 described above is provided with the magnet cover portion 202 formed so as to surround the magnetic poles 5 and 7, the cover 20 may be simplified so as to cover only the end face of the permanent magnet 10. FIG. 12 is a front view according to a modified example of the cover 20. In FIG. 12, the cover 20 does not have a portion where the magnet cover portion 202 surrounds the magnetic poles 5 and 7. That is, the outer surfaces of the magnetic poles 5 and 7 remain open, and the magnet cover portion 202 is configured to cover at least both end surfaces of the permanent magnet 10.

  The cover 20 shown in FIG. 12 can be further simplified. For example, the cover 20 can be simplified so that only one end surface of the permanent magnet 10 is covered with the cover 20 and the other end surface is covered with another adjacent member. FIG. 13 is a side view of the iron core 4 showing a structure in which one end surface of the permanent magnet is covered with the magnet cover portion 202 of the cover 20 and the other surface is covered with the cylinder block 21 of the engine.

  In FIG. 13, the iron core 4 is attached to a cylinder block 21 of the engine. Specifically, the cylinder block 21 has a boss 22 that receives the iron core 4, and the iron core 4 is fixed to the boss 22 by screwing a bolt 23 into a screw hole formed in the boss 22. The iron core 4 is provided with a long hole 24 through which the bolt 23 passes. The boss 22 is formed so as to expand to a region covering one of the end faces of the permanent magnet 10. Thus, one side of the end surface of the permanent magnet 10 is covered with the enlarged surface of the boss 22 with the iron core 4 attached to the boss 22.

  Further, the cover 20 can be modified as follows. The above-described cover 20 is an integral member that covers the end surfaces of the exciter coil 8 and the permanent magnet 10, but the end surfaces of the exciter coil 8 and the permanent magnet 10 can be covered with separate members.

  FIG. 14 is a perspective view showing a dedicated cover that covers one of the end faces of the permanent magnet 10 provided on the magnetic poles 5 and 7, and FIG. 15 is a front view of the iron core showing an example in which this cover is attached to the magnetic pole 5. It is. The permanent magnet dedicated cover 26 is made of a resin material, has a surface facing the front surface and both side surfaces of each of the magnetic poles 5 and 7, and covers one of the end surfaces of the permanent magnet 10 with the surface facing the front surface. It is formed so that it can. The permanent magnet dedicated cover 26 has a long hole 27 through which a bolt 23 for fixing the iron core 4 to the boss 22 can be passed.

  The cover 26 is applied to the magnetic pole 5, and the bolt 23 is passed through the long hole 27 and the long hole 24 of the iron core 4 and screwed into the boss 22, whereby the permanent magnet dedicated cover 26 and the iron core 4 are fixed to the boss 22 ( FIG. 15). The permanent magnet dedicated cover 26 is similarly attached to the magnetic pole 7.

  Since the cover 20 is formed of a resin material while fulfilling the function of covering the permanent magnet 10, the magnetic short circuit of the permanent magnet 10 can be prevented. The permanent magnet dedicated cover 26 that covers the end face of the permanent magnet 10 is also made of a non-magnetic material such as aluminum in order to prevent a magnetic short circuit of the permanent magnet 10.

  The above-described embodiment is an example in which the magnet power generator of the present invention is applied to a CDI type ignition device for an engine. However, a self-triggered ignition device of a type that combines an exciter coil 8 and an ignition coil 12 as a power generation coil. Further, the present invention is not limited to the ignition device, and can be applied as a power generation device for charging a battery or lighting a lighting device.

  The number of inductors 11 is not limited to one, and a plurality of inductors 11 may be arranged on the peripheral surface of the rotor 1. When the present invention is applied as a power generation device, a large power generation output can be obtained by providing a plurality of inductors 11.

  Further, the iron core 4 is not limited to be disposed so as to face the outer peripheral surface of the rotor 1, but the iron core 4 can be disposed on the inner surface side of the outer peripheral edge of the bottomed cylinder, that is, the saddle-shaped rotor. In that case, the inductor 11 is also arranged on the inner surface side of the rotor 1 so that the inductor 11 passes through a region facing the iron core 4 when the rotor 1 rotates.

  In the above-described embodiment, an example in which the present invention is applied to a power generation device driven by an engine is shown. Applicable. The inductor 11 is not limited to being provided on the outer peripheral surface or inner peripheral surface of the rotor 1, and may be provided on a surface (peripheral surface) near the outer periphery such as the outer peripheral side surface.

It is a front view (the 1) showing the important section composition of the engine ignition device concerning one embodiment of the invention. It is a front view (the 2) which shows the principal part structure of the engine ignition device which concerns on one Embodiment of invention. 3 is a diagram illustrating an example of a charging circuit including a power generation coil 8. FIG. It is a timing chart which shows operation | movement of a charging circuit. It is a front view of the permanent magnet cover integrated with the coil case. It is a side view of the permanent magnet cover integrated with the coil case. It is a bottom view of the permanent magnet cover integrated with the coil case. It is a front view of the iron core in which the permanent magnet was incorporated. It is a side view of the iron core in which the permanent magnet was incorporated. It is a front view of the permanent magnet cover in which the coil was incorporated. It is a side view of the permanent magnet cover in which the coil was incorporated. It is a front view of the permanent magnet cover integrated with the coil case. It is a side view of the ignition device attached to the engine. It is a perspective view of a cover for permanent magnets. It is a front view of the iron core which attached the permanent magnet exclusive cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotor, 2 ... Crankshaft, 3 ... Exciter, 4 ... Iron core, 5, 6, 7 ... Magnetic pole, 8 ... Exciter coil, 10 ... Permanent magnet, 11 ... Inductor, 12 ... Ignition coil, 20 ... Cover, 26 ... Permanent magnet cover, 201 ... Coil case part, 202 ... Magnet cover part

Claims (5)

In a magnet power generator that generates power by rotating a rotor,
An iron core disposed by winding a power generation coil at a position facing the circumferential surface of the rotor;
A permanent magnet mounted in a notch formed in the iron core;
At least one inductor provided on the peripheral surface of the rotor and forming a magnetic path of magnetic flux generated by the permanent magnet;
A magnet power generator comprising a resin cover that covers an exposed portion of the permanent magnet.   2. The magnet power generator according to claim 1, wherein the resin cover includes a coil case portion that houses the power generating coil and a magnet cover portion that is formed integrally with the coil case portion.   3. The magnet power generator according to claim 2, wherein, in the step of forming the resin cover, the power generating coil and the permanent magnet mounted on the iron core are sealed with resin.   A part of the exposed portion of the permanent magnet is covered with one surface of a support member that supports the iron core, the remaining portion of the exposed portion is covered with the resin cover, and the iron core is interposed through the resin cover. The magnet power generator according to claim 1, wherein the magnet power generator is fixed to a support member that supports the iron core. The magnet power generator according to claim 2, wherein the magnet cover portion is formed in a cylindrical shape surrounding the iron core on which the permanent magnet is mounted.

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