JPH0880020A - Flywheel magnet generator - Google Patents

Abstract

PURPOSE: To make the amplitude of an output voltage of a generating coil almost constant by constituting generating coils in such a manner that generator coils turned sequentially are connected in series at n-number of salient poles arranged alternately among 2n-number of salient poles of an armature iron core. CONSTITUTION: Among 12 salient poles, 6 salient poles M1 to M9 alternately and M11 are a first salient pole group, other 6 salient poles M2 to M10 alternately and M12 are a second salient pole group, thus dividing the 12 salient poles into two salient pole groups. Then, generating coils W1 to W9 and W11 are sequentially turned in the same winding direction for the first salient pole group, these generating coils are connected in series thereby constituting generating coils for the first system. Also for the second salient pole groups, the same kind of second system generating coils are constituted. And while the magnetic rotor makes one turn, the voltage waveform created between the output ends of the first system generating coils has a waveform with almost constant amplitude.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel magnet generator equipped with an ignition armature used for an ignition device of an internal combustion engine and a general load armature.

[0002]

2. Description of the Related Art A flywheel magnet generator installed in an internal combustion engine and used for supplying electric power to an internal combustion engine ignition device and a general load such as a headlamp (meaning a load other than the ignition device). As a machine, a flywheel magnet rotor having a magnet field for ignition and a magnet field for general load on the outer peripheral side and the inner peripheral side of the flywheel, and a magnet field for ignition and magnet for general load. Some include an ignition armature and a general load armature that induce a voltage for driving an ignition device and a voltage for driving a general load by a change in magnetic flux given by a field.

In this type of magnet generator, a concave portion is formed by deforming a part of the peripheral wall portion of the flywheel inward in the radial direction, and a magnet constituting an ignition magnet field is mounted in the concave portion. Therefore, a portion (a portion that is deformed to form the concave portion) cannot be attached to the inner peripheral side of the flywheel. Therefore, the magnetic field for a general load, which is formed on the inner peripheral side of the flywheel, lacks a part of the 2n magnetic poles (n is an integer of 2 or more) that should originally be provided at equal angular intervals. The AC voltage obtained from the armature for general load has a part of its waveform distorted.

FIG. 1 shows the structure of a magneto generator of an embodiment of the present invention described later. However, both the conventional magneto generator and the magneto generator of the present invention have a winding coil for a general load. Since the basic configuration is the same except for the method, the basic configuration will be described with reference to FIG. A flywheel magnet rotor 1 of a generator of this type includes a cup-shaped iron flywheel 11 and a peripheral wall portion 11 of the flywheel.
The permanent magnet 12 mounted in the magnet mounting recess 11b formed in a part of a and the peripheral wall portion 1 of the flywheel.
The flywheel 11 is attached to the rotating shaft of a prime mover such as an internal combustion engine, and the permanent magnets 14 to 16 are attached to the inner circumference of a region excluding a portion corresponding to the magnet attaching recess 11b of 1a. In this magnet rotor, the permanent magnet 12 and the peripheral wall portions of the flywheels on both sides of the permanent magnet 12 constitute an ignition magnet field, and the magnets 14 to 1
6 constitutes a general load magnet field.

The ignition armature 2 has an iron core 21 having a magnetic pole portion facing the ignition magnet field on the outer peripheral side of the peripheral wall of the flywheel 11, and a generator coil 22 for driving the ignition device wound around the iron core 21. It is arranged outside the flywheel and is fixed to a mounting portion provided in a case or the like of the engine.

The general load armature 3 is provided at each salient pole portion of the armature core 4 having 2n (n = 6 in this example) salient pole portions M1 to M12 radially provided at equal angular intervals. The generator coils W1 to W12 are wound, and inside the flywheel magnet rotor 1, each salient pole portion faces the general load magnet field.

In a conventional flywheel magnet generator of this type, when the generator coil of the general load armature 3 is used as a lighting power source for directly lighting two lamps such as a headlamp of a vehicle. In order to prevent an excessive voltage from being applied to the other lamp when one of the lamps is broken, n of the 2n salient pole portions are arranged adjacent to each other in one half of the armature core. 1 salient pole
As one salient pole group, 2n salient pole portions are divided into first and second salient pole groups, and the n salient pole portions forming the first salient pole group have different winding directions in order and alternately. Generator coil group that is wound around and connected in series, and generator coil that is wound around the n salient pole portions forming the second salient pole group in order and alternately with different winding directions, and connected in series The groups are respectively set as a first system power generation coil and a second system power generation coil, and two lamps are lit by the first and second system power generation coils.

FIG. 6 shows a conventional connection of the magneto coils W1 to W12 wound around twelve salient pole portions M1 to M12 in the generator having the structure shown in FIG. Are adjacent six salient pole portions M1 to M
The generator coils of the first system are constructed by connecting in series the generator coils W1 to W6 wound in different winding directions to 12 in series, and the other adjacent six salient pole portions M7.
The power generating coils of the second system are constructed by connecting the power generating coils W7 to W12 wound in different winding directions to M12 to M12 in series.

In the conventional flywheel magnet generator, the magnet rotor 1 is rotated clockwise (in the direction of the arrow shown in FIG. 1).
When it makes one full rotation, the magnetic flux φ1 passing through one salient pole portion of the salient pole portions forming the first salient pole group, for example, the salient pole portion M1,
As shown in (A), this magnetic flux change induces a voltage V1 'having a waveform shown in FIG. 7 (B) in the magneto coil W1 wound around the salient pole portion M1. The rotation angle θ on the horizontal axis in FIG. 7 is set to the origin (θ = 0) in the state shown in FIG.

Another salient pole portion M2 which constitutes the first salient pole group,
A magneto coil W2 wound around M3, ..., M6, respectively.
As shown in FIGS. 7 (C) to 7 (G), W3, ..., W6 are sequentially 180 ° in electrical angle (360 ° / 2 in mechanical angle).
Voltages V2 ', V3', ..., V6 'having a phase difference of (n = 30 °) and whose polarities are alternately inverted are induced. Therefore, V1 'and V2 are placed between the output terminals of the first system generating coil.
Output voltage V shown in FIG. 7 (H) obtained by adding V6 ', ...
a'is obtained. Also between the output terminals of the second system power generation coil, an output voltage having a similar waveform with a mechanical angle 180 ° out of phase with respect to Va ′ can be obtained.

[0011]

In the conventional flywheel magnet generator, as shown in FIG. 7 (H), while the magnet rotor makes one revolution, the generator coils of the first and second systems are generated. Since the amplitude of the output voltage generated between the output terminals varies, when the general load is a lamp, there is a problem that an annoying flicker occurs especially when the engine rotates at a low speed where the output frequency becomes low. In the case of loads other than lamps, the above-mentioned voltage fluctuation may cause a beat phenomenon.

It is an object of the present invention to use a generator coil of a general load armature as a generator coil of a first system, in which a magnetic flux is applied by a magnet field in which a part of a magnetic pole is missing to induce a voltage. It is an object of the present invention to provide a flywheel magnet generator capable of obtaining an output voltage with almost no fluctuation in amplitude from the power generating coils of each system when the power generating coils of the second system are separately configured.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a permanent magnet is mounted in a magnet mounting recess formed by forming a part of a peripheral wall of a cup-shaped iron flywheel inward in the radial direction. A magnet is attached to form an ignition magnet field on the outer peripheral side of the peripheral wall portion, and a permanent magnet is fixed to a region of the inner periphery of the peripheral wall portion except a portion corresponding to the magnet mounting recess. A flywheel magnet rotor that constitutes a general load magnet field, and an iron core having a magnetic pole portion facing the ignition magnet field on the outer peripheral side of the peripheral wall of the flywheel, around which a generator coil for driving the ignition device is wound. 2n pieces (n is 2) that are radially provided at equal angular intervals with the ignition armature.
An armature core having salient poles of (the above integers) and a generator coil wound around the salient poles of the armature core, and each salient pole is a general load magnet field inside the flywheel. The present invention relates to a flywheel magnet generator equipped with opposed armatures for general loads.

In the present invention, the n salient pole portions arranged every other armature core are regarded as one salient pole group and 2n.
The individual salient pole portions are divided into first and second salient pole groups. And
An n-th salient pole group is constructed by connecting in series the n-salient pole group's n-th salient pole group winding coils in series to form a first-system magneto-coil. A power generating coil wound in order on each salient pole portion is connected in series to form a second power generating coil.

[0015]

As described above, the generator coils, which are sequentially wound around the n salient pole portions of every 2n salient pole portions of the armature core, are connected in series to each other. 1st and 2nd
When the magneto coils of the system are configured, the amplitude of the voltage induced in each of the n magneto coils which respectively configure the magneto coils of the first and second systems varies while the magnet rotor makes one revolution. , The voltage induced in each of the n generator coils of each system is 360 ° in electrical angle (360 ° in mechanical angle).
The voltage has the same waveform with the phase sequentially shifted by ° / n).
Between the output terminals of the first and second power generation coils, a combined voltage that is the sum of n voltages whose phases are sequentially shifted by 360 ° in electrical angle (360 ° / n in mechanical angle) is output. Therefore, the amplitude of each output voltage of each system is substantially constant during one rotation of the magnet rotor and does not fluctuate.

Therefore, when the lamps are driven by the outputs of the first and second power generation coils, respectively, flicker occurs at low speed rotation, and a beating phenomenon occurs when a load other than the lamps is driven. Can be prevented.

[0017]

EXAMPLE FIG. 1 shows that the armature core has 12 salient poles (n
= 6), an overall configuration of an embodiment to which the present invention is applied is shown. In FIG. 1, 1 is a flywheel magnet rotor, and 2 is an outer peripheral side of the flywheel magnet rotor 1. The ignition armature 3 is a general load armature arranged inside the flywheel magnet rotor 1.

The flywheel magnet rotor 1 has a cup-shaped cast iron flywheel 11 in which a magnet mounting recess 11b is formed by forming a part of the peripheral wall portion inward in the radial direction, and a magnet mounting magnet. It is provided with one permanent magnet 12 mounted in the recess 11b, and permanent magnets 14 to 16 fixed to the inner circumference of a region of the peripheral wall of the flywheel excluding the portion corresponding to the recess 11b.

More specifically, the permanent magnet 12 is magnetized in the radial direction of the flywheel, and the magnetic pole piece 13 is brought into contact with the magnetic pole surface of the permanent magnet 12 on the outer side in the radial direction. The magnet 12 and the magnetic pole piece 13 are fixed to the flywheel 11 by a screw (not shown) provided so as to penetrate the magnet 13 and the magnet 12. The magnetic pole piece 13 is formed so that its outer peripheral surface is located on the same cylindrical surface as the outer peripheral surface of the peripheral wall portion 11a of the flywheel excluding the recessed portion 11b. An ignition magnet field is formed by the outer peripheral surface of the peripheral wall portion 11a of the wheel.

A portion of the peripheral wall portion 11a of the flywheel corresponding to the magnet mounting recess 11b is formed so as to protrude inward in the radial direction from the other portion of the peripheral wall portion 11a to form the simulated magnetic pole 11B. The polar arc angle of the simulated magnetic pole 11B is set equal to the polar arc angle of each of the magnets 14-16. The magnets 14 to 16 and the simulated magnetic pole 11B are 9
They are arranged with an angular interval of 0 degree.

In the present embodiment, the predetermined areas of the permanent magnets 14 to 16 are arranged so that the magnetic poles N, S, N, ... Having alternating polarities are arranged at an angular interval of 30 degrees (= 360/12 degrees). Direction is magnetized to form a total of 9 magnetic poles.
The magnetic field for a general load is constituted by the individual magnetic poles.
This general load magnet field is equivalent to one obtained by replacing three magnetic poles of the magnet field of the 12-pole magnet rotor with the simulated magnetic pole 11B.

A boss portion 11d formed integrally with the bottom wall portion 11c of the flywheel 11 is provided at the center of the bottom wall portion 11c, and the boss portion is fitted to the rotating shaft of a prime mover such as an internal combustion engine. The flywheel magnet rotor 1 is attached to the prime mover.

The ignition armature 2 has a pair of iron core leg portions 2 each having a magnetic pole portion facing the ignition magnet field outside the flywheel 11 via a predetermined small gap at one end side.
1a and 21b, and a U-shaped iron core 21 including a rod-shaped iron core portion 21c for connecting between the iron core legs, and an ignition coil 22 for driving an ignition device wound around the rod-shaped iron core portion 21c of the iron core. It consists of The ignition armature 2 is attached to a crankcase or the like of the engine by mounting screws (not shown) inserted into mounting holes 21d provided in the iron core leg portions 21a and 21b, respectively.

The power generating coil 22 for driving the ignition device is appropriately configured according to the configuration of the ignition device used. For example, when a capacitor discharge type igniter is used, the generator coil 22 includes a large number of small conductors so that the induced voltage can charge the ignition energy storage capacitor to a sufficiently high voltage. It is wound around. When a primary current interruption type ignition device is used, the generator coil 22 is wound with a conductor having a relatively large diameter in order to allow a sufficiently large primary current to flow. . There is also a case where an ignition coil having a primary coil and a secondary coil is wound around the iron core 21, and the primary coil of the ignition coil is used as a power generating coil for driving the ignition device.

The general load armature 3 is composed of an armature core 4 made of a laminated body of steel plates and a magneto coil wound around the armature core. The armature core 4 includes twelve (2n) salient pole portions M1 radially from the annular yoke portion 41 at equal angular intervals.
〜M12 is a star-shaped multi-pole iron core with salient poles M1
Magnetic poles at the tips of M12 to M12 are opposed to the general load magnet field of the flywheel magnet rotor 1 via a predetermined small gap. In the present invention, of the twelve salient pole portions, six salient pole portions M1 arranged at intervals of one
M3, M5, M7, M9 and M11 are the first salient pole group,
Six other salient pole parts M2, M4, M arranged every other one
Twelve salient pole portions are divided into two salient pole groups with 6, M8, M10 and M12 as the second salient pole group. Then, as shown in FIG. 2, the six salient pole portions M1 and M constituting the first salient pole group are formed.
3, M5, M7, M9, and M11, respectively, with a generator coil W
1, W3, W5, W7, W9 and W11 are sequentially wound in the same winding direction to connect these magneto coils in series, and these six magneto coils constitute the magneto coil of the first system. Further, the six salient pole portions M2, M4, M6, M8, M10 and M12 constituting the second salient pole group are sequentially wound with the same direction as the winding coils W2, W4, W6, W8, W10 and W12. By winding and connecting these power generating coils in series, the power generating coils of the second system are constituted by these six power generating coils. Leaders 51a and 51 from the winding start and winding end of the first system power generation coil, respectively.
b is drawn to the outside, and lead lines 52a and 52b are drawn to the outside from the winding start and winding end of the second system power generation coil, respectively.

The general load armature 3 has mounting holes 41b, 41b, ... Provided in the annular yoke portion 41 of the armature core.
It is attached to a crankcase of an engine (not shown) or the like by a mounting screw inserted in.

In the flywheel magnet generator described above, when the magnet rotor 1 rotates, the magnetic flux flowing through the iron core 21 is changed by the ignition magnet field, and the power generation coil 22 of the ignition armature 2 is driven by the ignition device. A voltage is induced, and the magnetic field flowing through each salient pole portion of the armature core 4 is changed by the general load magnet field, so that a voltage is induced in each magneto coil wound around the salient pole portion.

FIG. 3A shows a magnet rotor 1 in FIG.
Salient pole portion M1 of the armature core 4 when rotating clockwise
The waveform of the magnetic flux φ 1 flowing in the axis of rotation is shown. The rotation angle θ on the horizontal axis is the origin (θ = 0) in the state shown in FIG. As can be seen from the figure, the waveform of this magnetic flux φ 1 is θ = 0
The left half portion (θ = −180 ° to 0 °) and the right half portion (θ = 0 ° to 180 °) have symmetrical waveforms with respect to the position. In the magneto coil W1 wound around the salient pole portion M1, a voltage V1 having a waveform shown in FIG. 3B is induced by the temporal change of the magnetic flux φ1 of the salient pole portion. The magnetic flux flowing through the other salient pole portions M3, M5, M7, M9 and M11 forming the first salient pole group of the armature core 4 is 360 ° in electrical angle with respect to the magnetic flux φ1 flowing through the salient pole portion M1 (machine Since the waveforms are the same with the phases sequentially shifted by 360 ° / 6) at each angle, each of the other magneto coils W3, W5 constituting the magneto coil of the first system wound around each salient pole portion, W7, W9 and W11 are respectively shown in FIG.
As shown in FIGS. 3 (C) to 3 (G), the generator coil W1
To the induced voltage V1 of 360 ° in electrical angle (3 in mechanical angle)
Voltage V of similar waveform with phase sequentially shifted by 60 ° / 6)
3, V5, V7, V9 and V11 are induced.

The voltage Va generated between the output terminals of the generator coils of the first system is defined by the generator coils W1, W3, W5, W7, W.
The voltages V1, V3, V5 induced on 9 and W11, respectively,
The combined voltage is the sum of V7, V9 and V11.
The six positive half-waves and the six negative half-waves of the combined voltage Va are both the six positive half-waves and the six negative half-waves of the induced voltage (for example, V1) of one magneto coil. Since it is almost equal to the sum of the waves, the waveform of the voltage Va generated between the output terminals of the magneto coils of the first system during one revolution of the magnet rotor has the amplitude shown in FIG. 3 (H). Is almost constant. Similarly, the generator coils W2, W4, W6
, W8, W10 and W12 are connected in series, the voltage generated between the output terminals of the second system magneto coils is also a waveform whose amplitude is almost constant. Therefore, when the lamp is driven as a general load by the output of the power generation coil of the first system and the output of the power generation coil of the second system, the lamp does not flicker and another load is used as the general load. When driving, the beating phenomenon does not occur.

In the above embodiment, the armature iron core of the general load armature has 12 poles. However, in the present invention, the number of poles of the armature iron core is arbitrary and generally 2n (n is n). The present invention can be applied to the case where an armature core having salient pole portions of 2 or more) is used as an armature for general loads.

For example, FIG. 4 shows a case where the armature core 4 having eight salient pole portions M1 to M8 is used, and the magneto coils W1 to W8 are wound around the salient pole portions M1 to M8. In this case, the magnets 14 to 16 fixed to the inner circumference of the flywheel
45 degrees (= 360 /
Six magnetic poles arranged at an angular interval of 8 degrees are formed, and these magnetic poles form a general load magnet field. The general load magnet field of this example is equivalent to one obtained by replacing two of the eight magnetic poles of the eight-pole magnet rotor with the simulated magnetic pole 11B.

In the embodiment of FIG. 4, four salient pole portions M1, M3, M5 and M7 arranged at every other armature core 4 are sequentially wound in the same winding direction and connected in series. The four power generating coils W1, W3, W5 and W7 thus configured constitute the power generating coil of the first system, and are the same as the other four salient pole portions M2, M4, M6 and M8 arranged at every other position. The four power generation coils W2, W4, W6 and W8, which are sequentially wound in the winding direction and connected in series, form a power generation coil of the second system.

FIG. 5A shows the waveform of the magnetic flux .phi.1 flowing through the salient pole portion M1 of the embodiment of FIG. 4, and the rotation angle position .theta. Of the magnet rotor 1 is based on the state of FIG. 0). FIG. 5 (B) shows the waveform of the induced voltage V1 of the magneto coil W1 wound around the salient pole portion M1. The waveform of this voltage V1 is at the left half (θ = -1
The waveform is symmetrical between 80 ° to 0 ° and the right half (θ = 0 ° to 180 °). The voltage induced in each of the other generator coils W3, W5 and W7 constituting the generator coil of the first system is 360 ° in electrical angle (360 ° / 4 in mechanical angle) with respect to the induced voltage V1 in the generator coil W1. 4 positive half waves and 4 negative half waves of the voltage Va obtained between the output ends of the magneto coils of the first system during one revolution of the magnet rotor. Has almost the same waveform as the sum of the four positive half waves and the four negative half waves of the induced voltage V1 of one generator coil (for example, the generator coil W1). Therefore, the amplitude of the voltage Va obtained between the output ends of the magneto coils of the first system during one revolution of the magnet rotor becomes substantially constant as shown in FIG. 5 (C). Similarly, the amplitude of the voltage obtained between the output terminals of the second system power generation coil during one rotation of the rotor becomes substantially constant.

[0034]

As described above, according to the present invention, salient poles arranged at every other armature core of a general load armature having 2n salient pole portions provided at equal angular intervals. The power generating coils of the first and second systems are configured by connecting the power generating coils wound around the respective parts in series, and the general load is driven by the outputs of the power generating coils of the first and second systems, respectively. By doing so, the amplitude of the output voltage of the power generation coil of each system can be made substantially constant. Therefore, when the lamp is driven to be driven as a general load, it is possible to prevent the lamp from flickering at low speed rotation, and it is possible to eliminate the possibility of a beating phenomenon when driving another load as a general load.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an overall configuration of an exemplary embodiment of the present invention.

FIG. 2 is a connection diagram of the magneto coils in FIG.

FIG. 3 is a waveform diagram showing a magnetic flux waveform and a voltage waveform of each part in the embodiment of FIG.

FIG. 4 is a configuration diagram showing an overall configuration of another embodiment of the present invention.

5 is a waveform diagram showing a magnetic flux waveform and a voltage waveform of each part in the embodiment of FIG.

FIG. 6 is a connection diagram showing the connection of the magneto coils in a conventional example.

FIG. 7 is a waveform diagram showing a magnetic flux waveform and a voltage waveform of each part in a conventional generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flywheel magnet rotor 2 Ignition armature 3 General load armature 4 Armature iron core 11 Flywheel 11a Peripheral wall part 11b Magnet mounting recess 11B Simulated magnetic pole 11c Bottom wall part 11d Boss part 12 Permanent magnet 13 Magnetic pole piece 14- 16 permanent magnet 21 iron core 21a, 21b iron core leg part 21c rod-shaped iron core part 21d mounting hole 22 generator coil 41 yoke part 51a, 51b, 52a, 52b lead wire

Claims (1)

[Claims] 1. A permanent magnet is mounted in a magnet mounting recess formed by forming a part of the peripheral wall of a cup-shaped iron flywheel inward in the radial direction, and a permanent magnet is mounted in the recess. An ignition magnet field is formed on the outer peripheral side, and a permanent magnet is fixed to a region of the inner wall of the peripheral wall portion except a portion corresponding to the magnet mounting recess to form a general load magnet field of multiple poles. A flywheel magnet rotor configured, and an ignition armature formed by winding a generator coil for driving an ignition device around an iron core having a magnetic pole portion facing the ignition magnet field on the outer peripheral side of the peripheral wall of the flywheel, The fly comprises an armature core having 2n (n is an integer of 2 or more) salient pole portions radially provided at equal angular intervals, and a magneto coil wound around the salient pole portion of the armature core. Inside the wheel, each salient pole is in front A flywheel magnet generator comprising a general load armature facing a general load magnet field, wherein n salient pole portions arranged at every other armature core are provided as one salient pole. As a group, the 2n salient pole portions are divided into a first salient pole group and a second salient pole group, and the magneto coils that are sequentially wound around the n salient pole portions that form the first salient pole group are connected in series. To form a first system magneto coil, and to connect in series the magneto coils wound in order around the n salient poles forming the second salient pole group to form the second system magneto coil. A flywheel magnet generator characterized in that it is configured.