JPH0799914B2 - Magnet generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnet generator including a stator formed by winding a generator coil around an armature core and a flywheel magnet rotor. .

[Prior Art] A magnet generator is often used as a generator using an internal combustion engine, a wind turbine, or the like as a drive source. For example, as shown in FIG. 7, the magnet generator includes a stator 1 and a flywheel magnet rotor 2
Composed of and. The stator in this example has an annular yoke section.
The coiled parts 301a, 301b, ... Are projected from the coil 300, and the magnetic pole parts 302a, 302b, ... Are formed at the tips of the coiled parts, and are wound around the star armature core 3 and the coiled parts. Generator coil 4
The armature core 3 is composed of a, 4b, ... And has a predetermined mounting portion (for example, a mounting portion provided in the case of the internal combustion engine) by a bolt (not shown) inserted into a mounting hole 303 provided in the yoke portion 300 thereof. It is fixed to.

The flywheel magnet rotor 2 is composed of a flywheel 5 formed in a substantially cup shape and permanent magnets 6A, 6B, ... Fixed on the inner circumference of the flywheel. Each permanent magnet is arranged in the radial direction of the flywheel. A plurality of rotor magnetic poles 7a, 7b, ... Which are magnetized and arranged at intervals in the circumferential direction are configured. The flywheel 5 has a boss 501 on its bottom wall,
This boss is attached to a rotary drive shaft (for example, an output shaft of an internal combustion engine), and the rotor magnetic poles 7a, 7b, ... Are fixed magnetic poles 302a, 302.
It is made to face b, ... through a predetermined gap.

In FIG. 7, the diagonal lines of the magnets 6A, 6B, ... Do not show the cross section but show the magnetized region. The magnetized regions of the magnets 6A, 6B, ... Are distributed over almost the entire area in the circumferential direction of each magnet, and are magnetized in different radial directions alternately so that the magnetic poles on the inner circumferential side of adjacent magnets have different polarities. It is magnetized.

The permanent magnets may be arranged in a ring shape on the inner circumference of the flywheel, and the magnets arranged in the ring shape may be magnetized to a predetermined number of poles to form the rotor magnetic poles. Similar to the example shown in the figure, each rotor magnetic pole is composed of one magnetized region.

[Problems to be Solved by the Invention] In the conventional magnet generator, the waveform of the magnetic flux φ1 interlinking each of the magneto coils with respect to the rotation angle θ is as shown by the broken line in FIG. It was unavoidable that the corrugations had rounded shoulders. Therefore, there is a limit when trying to increase the peak value of the voltage e1 induced in the magneto coils 4a, 4b, ... When supplying electric power to a load that requires a high output voltage, for example, ignition for an internal combustion engine. When the device is used as a load, the load performance may not be sufficiently exhibited.

An object of the present invention is to provide a magnet generator capable of obtaining a higher output voltage than ever before.

[Means for Solving the Problems] The present invention has a flywheel and a permanent magnet fixed to the inner circumference of the flywheel, and the permanent magnet is magnetized in the radial direction of the flywheel to circumferentially A flywheel magnet rotor having a plurality of rotor magnetic poles arranged side by side, and a stator formed by winding a generator coil around an armature core having a magnetic pole portion facing each rotor magnetic pole of the flywheel magnet rotor. In the magneto-generator provided with, the roundness of the shoulder portion of the magnetic flux waveform interlinking with the generator coil is reduced so that the peak value of the output voltage can be made higher than in the conventional case.

Therefore, in the present invention, each rotor magnetic pole of the flywheel magnet rotor is configured by two magnetized regions that are arranged at intervals in the circumferential direction. Further, the pole arc angle of each of the magnetic pole portions of the stator is set so as to face the rotor magnetic poles, that is, to face the two magnetized regions forming the rotor magnetic poles.

[Operation] As described above, each rotor magnetic pole is composed of the two magnetized regions arranged at intervals in the circumferential direction, and each magnetized magnetic pole part of the stator is two magnetized regions constituting each rotor magnetic pole. By setting the pole arc angle of each stator so that they can face each other, the magnetic flux density in the vicinity of both ends in the circumferential direction of each rotor magnetic pole can be increased, and each rotor magnetic pole is positioned at the position of the stator magnetic pole. Since it is possible to reduce the roundness of the shoulder of the magnetic flux waveform interlinking with the generator coil when passing through, it is possible to increase the rate of change of the magnetic flux interlinking the generator coil and increase the peak value of the output voltage. it can.

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

In each of the drawings described below, the diagonal lines do not show the cross section but the magnetized region of the permanent magnet.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, parts that are the same as the parts of the conventional example shown in FIG. 7 are given the same reference numerals.

In FIG. 1, 1 is a stator and 2 is a flywheel magnet rotor. In the stator 1, like the generator shown in FIG. 7, the coil winding portions 301a, 301b, ... Are projected from the annular yoke portion 300, and the magnetic pole portions 302a, 302b, are attached to the tips of the coil winding portions. …
The star-shaped armature core 3 and the power-generating coils 4a, 4b, ... Wound around the respective coil winding parts, and the armature core 3 is inserted into the mounting hole 303 provided in the yoke part 300. It is fixed to a mounting portion provided on a case or the like of the internal combustion engine by a bolt (not shown).

The flywheel magnet rotor 2 is formed by fixing four arc-shaped permanent magnets 6A to 6D at an equal interval in the circumferential direction on the inner circumference of the peripheral wall portion of an iron flywheel 5 formed in a substantially cup shape. A boss 501 for mounting a rotary shaft is provided at the center of the bottom wall of the flywheel.

In the present embodiment, the permanent magnets 6A to 6D have two magnetized regions arranged in the circumferential direction at intervals, and the two magnetized regions are partitioned by the non-magnetized regions. More specifically, the permanent magnet 6A has magnetized areas An and As divided by the non-magnetized area MA, and the permanent magnet 6B has magnetized areas Bs and Bn divided by the non-magnetized area MB. is doing. The permanent magnet 6C has magnetized regions Cn and Cs divided by the non-magnetized region MC, and the permanent magnet 6D has the non-magnetized region M.
It has magnetized regions Ds and Dn divided by D.
These magnetized regions are An-As in the clockwise direction in FIG.
-Bs-Bn-Cn-Cs-Ds-Dn are arranged in this order, and the adjacent permanent magnets 6D and
Magnetic poles (N pole) on the inner circumference side of adjacent magnetized areas Dn and An of 6A
7a1 and 7a2 cause the rotor magnetic pole 7a to move to the magnetized area As
, And Bs on the inner peripheral side (S pole) 7b1 and 7b2 constitute a rotor magnetic pole 7b. Further, the magnetized area B
The inner magnetic poles (N poles) 7c1 and 7c2 of n and Cn constitute the rotor magnetic pole 7c, and the inner magnetic poles (S pole) 7d1 and 7d2 of the magnetized regions Cs and Ds constitute the rotor magnetic pole 7d. Has been done.

The two magnetized regions of each permanent magnet are provided so that their circumferential lengths are equal, and the magnetized amounts of the magnetized regions are set to be equal.

Further, the two magnetized regions forming each of the rotor magnetic poles 7a to 7d are symmetrical on both sides of the central portion in the circumferential direction of each rotor magnetic pole (in this embodiment, the central portion of the gap between adjacent permanent magnets). It is supposed to be placed in.

Further, the magnetic pole portions 302a to 302d of the armature core of the stator are arranged so as to face the rotor magnetic poles, that is, to face the two magnetized regions forming the rotor magnetic poles as shown in the figure. , Each polar arc angle is set.

As described above, two magnetized regions are provided in each rotor magnetic pole, and the non-magnetized region M of the permanent magnet is provided between the rotor magnetic poles 7a to 7d.
When the rotor magnetic poles are divided by A to MD, as compared with the case where the rotor magnetic poles are constituted by a single magnetized region and the rotor magnetic poles are divided by a gap as shown in FIG. It was clarified by experiment that the magnetic flux density near both ends of the becomes higher. According to the experiment, the magnetic flux density in the vicinity of both ends of each rotor magnetic pole can be increased by 20% to 30% as compared with the case of FIG. 7 by configuring as shown in FIG.

FIG. 2 shows the magnetic flux density on the surface of the rotor magnetic pole with respect to the angle θ. In FIG. 2, G1 shows the magnetic flux density distribution on the surface of the rotor magnetic pole in the conventional magnet generator shown in FIG. G2 shows the magnetic flux density distribution on the surface of the rotor magnetic pole in the magnet generator of the present invention shown in FIG. From this, it is understood that according to the present invention, the magnetic flux density at both ends of each rotor magnetic pole can be made considerably higher than that of the conventional one.

As described above, in the present invention, since the magnetic flux density at both ends of each rotor magnetic pole is high, the magnetic flux φ2 linked to each magneto coil is
As shown by the solid line in FIG. 3 (A), the waveform of has a small shoulder roundness. As shown by the solid line in FIG. 3 (B), the output voltage e1 obtained by the conventional magneto-generator is The voltage e2 having a high peak value can be obtained.

When a voltage having a high crest value is obtained as described above, the performance can be improved when, for example, an ignition device for an internal combustion engine is used as a load. As an example, FIG. 4 shows a circuit example of an ignition device for an internal combustion engine, which is suitable for being driven by the magnet generator. The ignition device shown in FIG. 4 has an ignition coil IG and
A known capacitor discharge type consisting of a spark plug P attached to a cylinder of an engine, an exciter coil Ex, an ignition energy storage capacitor C1, a thyristor Th, diodes D1 to D5, a zener diode ZD, and a resistor R1. In the ignition device, as the exciter coil Ex, at least one power generation coil in the magnet power generator, for example, the power generation coil 4a is provided. In this ignition device, the exciter coil
The positive half cycle output voltage of Ex charges the capacitor C1 to the polarity shown in the figure, and the negative half cycle output voltage of the exciter coil causes the Zener diode ZD → thyristor.
An ignition signal is given to the thyristor Th through the path between the gate and cathode of Th → the diode D3 → the exciter coil Ex. When the ignition signal is given to the thyristor Th, the electric charge of the capacitor C1 is discharged through the thyristor Th and the primary coil of the ignition coil IG, and a high voltage is induced in the secondary coil of the ignition coil. As a result, a spark is generated in the spark plug P, and the engine is ignited.

In order to improve the performance of the ignition device shown in FIG. 4, it is necessary to increase the peak value of the charging voltage (terminal voltage) of the capacitor C1. When the conventional magnet generator shown in FIG. 7 is used, the terminal voltage of the capacitor C1 is Vc1 in FIG. 3 (C), but when the magnet generator of the present invention is used, the terminal voltage of the capacitor C1 is The ignition performance can be improved by increasing Vc2 as shown in FIG. 3 (C). In particular, when the magneto-generator of the present invention is used, the ignition performance at low speed of the engine can be enhanced, so that the rotational speed at which the ignition operation is started can be lowered, and the startability of the engine can be improved. it can.

In the above embodiment, the armature core is a star-shaped core, but as shown in FIG. 5, the I-shaped core having the magnetic pole parts 311 and 311 formed at both ends of the coil winding part 310 is used to generate electricity in the core. The present invention can be applied to the case where the coil 4 is wound. The pole arc angle is set so that the magnetic pole portions 311 of the iron core can face each other across the magnetized regions forming the rotor magnetic poles, as in the embodiment of FIG.

In the above embodiment, four permanent magnets are attached to the inner circumference of the flywheel. However, the present invention is also applicable to the case where more permanent magnets are attached and rotor poles having more than four poles are provided. Can be applied.

FIG. 6 shows another embodiment of the present invention. In this embodiment, a ring-shaped permanent magnet 6 is attached to the inner circumference of the flywheel 5. The permanent magnet 6 may be integrally formed in a ring shape, or may be a plurality of arcuate magnets arranged in a ring shape.

Similar to the example shown in FIG. 1, the permanent magnet 6 has magnetized areas An, As, Bs, Bn, ... Ds, Dn having the same circumferential dimension and the same amount of magnetization.
have. Of these magnetized regions, As to Ds are magnetized in the radial direction so that their inner peripheral sides are S poles, and the magnetized regions An to Dn are radially magnetized so that their inner peripheral sides are N poles. It is magnetized. Between the magnetized areas An and As, Bs
And Bn, between Cn and Cs, and between Ds and Dn, the non-magnetized areas MA and M partitioning the rotor magnetic poles from each other.
B, MC and MD are provided, and between the magnetized areas As and Bs, Bn
And Cn, between Cs and Ds, and between Dn and An, the non-magnetized regions P1, P2, P3 located at the center of the rotor magnetic pole, respectively.
And P4 are provided. Similar to the example shown in FIG. 1,
The magnetized regions Dn and An form the N-pole rotor magnetic pole 7a, and the magnetized regions As and Bs form the S-pole rotor magnetic pole 7b. The magnetized regions Bn and Cn form the N-pole rotor magnetic pole 7c, and the magnetized regions Cs and Ds form the S-pole rotor magnetic pole 7d.

The same effect as described above can be obtained by the embodiment shown in FIG. In the embodiment shown in FIG. 7 as well, the rotor can be configured with multiple poles of four or more.

[Effects of the Invention] As described above, according to the present invention, each rotor magnetic pole is configured by two magnetized regions arranged at intervals in the circumferential direction,
Since the pole arc angle of each stator is set so that each magnetic pole portion of the stator can be opposed to each other across the two magnetized regions forming each rotor magnetic pole, both ends of each rotor magnetic pole in the circumferential direction are close to each other. There is an advantage that the magnetic flux density can be increased to reduce the roundness of the shoulder portion of the magnetic flux waveform interlinking with the generator coil, and the rate of change of the magnetic flux can be increased to increase the peak value of the output voltage.

[Brief description of drawings]

1 is a front view showing an embodiment of the present invention, and FIG. 2 is a magnetic flux density distribution on the surface of the rotor magnetic pole of the embodiment of FIG. 3A, 3B and 3C show a magnetic flux waveform, an output voltage waveform of the embodiment of FIG. 1 and a generator of the embodiment, which is a capacitor discharge type ignition device for an internal combustion engine. Fig. 4 shows a capacitor terminal voltage waveform in the case of driving a capacitor compared with the conventional case, and Fig. 4 shows a capacitor discharge type ignition device for an internal combustion engine as an example of a load driven by the generator of the present invention. Circuit diagram, FIG. 5 is a front view showing another embodiment of the present invention, FIG. 6 is a front view of a flywheel magnet rotor used in still another embodiment of the present invention, and FIG. 7 is a conventional magnet. It is a front view which shows a generator. 1 ... Stator, 2 ... Flywheel magnet rotor, 3 ...
… Armature core, 4a-4d …… Generating coil, 5 ・ ・ ・ Flywheel, 6,6A ～ 6D …… Permanent magnet, 7a ～ 7d …… Rotor magnetic pole, An ～ Dn, As ～ Ds …… Magnification area , MA ~ MD, P1 ~ P4
...... Unmagnetized area.

Claims (4)

[Claims] 1. A plurality of rotor magnetic poles having a flywheel and a permanent magnet fixed to an inner circumference of the flywheel, wherein the permanent magnet is magnetized in a radial direction of the flywheel and arranged in a circumferential direction. In a flywheel magnet rotor and a stator formed by winding a generator coil around an armature core having magnetic pole portions facing the rotor magnetic poles of the flywheel magnet rotor. The rotor magnetic poles of the flywheel magnet rotor are composed of two magnetized regions that are arranged at intervals in the circumferential direction, and the magnetic pole portions of the stator are magnetized to form two rotor magnetic poles. A magneto-generator having a polar arc angle set so as to be able to face each other across the region. 2. A plurality of the permanent magnets are arranged side by side at intervals in the circumferential direction of the flywheel, and each permanent magnet has two magnetized regions arranged at intervals in the circumferential direction. An area between the two magnetized areas is an unmagnetized area that partitions the rotor magnetic poles, and the two magnetized areas of each permanent magnet are provided so that the inner peripheral sides have different polarities. The adjacent magnetized regions of the adjacent permanent magnets are provided such that the inner peripheral sides thereof have the same polarity, and the adjacent magnetized regions of the adjacent permanent magnets form one rotor magnetic pole. The magnet generator according to claim 1, characterized in that 3. The permanent magnets are arranged in a ring shape on the inner circumference of the flywheel, and the permanent magnets arranged in a ring shape have a plurality of magnetic pole constituent regions forming the rotor magnetic poles, The adjacent magnetic pole constituent regions are partitioned by non-magnetized regions, and each magnetic pole constituent region has two magnetized regions arranged at intervals in the circumferential direction. Two magnetized regions of each magnetic pole constituent region Claim 1 is characterized in that the inner peripheral side is provided so as to exhibit the same polarity, and adjacent magnetized regions of adjacent magnetic pole constituent regions are provided so that the inner peripheral side exhibits different polarities. Alternatively, the magnet generator according to item 2. 4. The two magnetized regions forming each rotor magnetic pole are provided so as to be symmetrically arranged on both sides of the central portion in the circumferential direction of each rotor magnetic pole. , The magnet generator according to any one of items 2 and 3.