JP3680973B2 - Outer rotor type engine generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outer rotor type engine generator.
[0002]
[Prior art]
In recent years, multipolar generators in which magnets are arranged on the inner peripheral surface of the outer rotor have been frequently used as power generation parts such as portable generators that extract commercial frequency output by inverter control.
[0003]
When driving this outer rotor type multi-pole generator with an engine, it is possible to use the outer rotor as a flywheel rotor that also serves as the engine flywheel. By adopting this method, a separate dedicated flywheel Therefore, it is possible to reduce the size of the entire engine generator.
[0004]
[Problems to be solved by the invention]
However, on the other hand, there is a problem that it is quite difficult to use an external ignition device such as a self-triggered ignition device that attaches a magnet to the outer periphery of a flywheel as in the prior art and extracts the ignition energy.
[0005]
In other words, in the case of the outer rotor, the diameter of the outer rotor cannot be reduced in order to obtain sufficient energy due to the arrangement of the power generating magnet on the inner peripheral surface, and the large diameter that increases the peripheral speed. Further, attaching a magnet to the outer periphery of the outer rotor (for example, Japanese Patent Application Laid-Open No. 61-40463) makes it difficult to obtain the support strength of the magnet and increases the size of the outer rotor.
[0006]
For this reason, when the outer rotor is used as an engine flywheel, for example, as described in Japanese Utility Model Publication No. 6-46219, a part of the pole of the multipolar power generation section inside the outer rotor is exclusively used for ignition. Therefore, the ignition device itself becomes complicated and expensive, and a part of the multipolar power generation unit that should be able to extract high output is used for ignition to generate power output. There was a problem of sacrifice.
[0007]
Therefore, in the previous application (Japanese Patent Application No. 9-9309), the applicant of the present application guides the magnetic force of the magnet arranged inside the outer ring-shaped wall of the outer rotor to the outside through the transparent window, and An engine generator is proposed in which an ignition power source can be taken out by a power generation unit for an engine ignition device arranged to face the outside of the engine.
[0008]
According to this, the ignition power supply can be taken out with a simple structure without sacrificing the power generation output, but when a transparent window is formed by removing a part of the thick outer ring belt-like wall, high speed It becomes a problem to maintain the rotational balance of the outer rotor that rotates at the same time.
[0009]
The present invention has been made in view of the above points, and the object of the present invention is simple by guiding the magnetic force of a magnet arranged inside the outer ring belt-like wall of the outer rotor to the outside through a transparent window. It is in providing an outer rotor type engine generator that can maintain a good rotational balance of the outer rotor while taking out the ignition power source with the structure.
[0010]
[Means for solving the problems and effects]
In order to achieve the above object, the present invention provides an internal space in which a plurality of magnets are arranged in the circumferential direction on the inner periphery of an outer ring belt-like wall of an outer rotor formed in a bottomed cylindrical shape and facing the magnets. In an outer rotor type engine generator that houses a stator in which a multipolar power generation coil is wound, an engine ignition device power generation unit is disposed opposite the outer ring-shaped wall of the outer rotor, A through-hole for penetrating magnetic force is formed on a part of the outer ring belt-like wall of the outer rotor so as to apply the magnetic force of the magnet toward the power generation unit for the engine ignition device, and the side portion of the outer ring belt-like wall of the outer rotor is formed. Among the plurality of cooling ventilation openings formed in the bottom wall portion that closes the gap, the cooling ventilation opening formed on the opposite side to the transparent window for magnetic penetration and the rotation center is enlarged, and the rotation of the outer rotor Previous to center On the opposite side of the outer ring belt wall opening side edge of the show-window for force through providing the notch, and the structure was outer rotor type engine generator so as to adjust the rotational balance of the outer rotor.
[0011]
A transparent window for penetrating magnetic force is provided in a part of the outer ring belt-like wall of the outer rotor having a bottomed cylindrical shape, and is opposed to the transparent window and the rotation center in the cooling ventilation opening provided in the bottom wall of the outer rotor. Including the presence of this notch while increasing the cooling ventilation opening formed on the side and providing a notch on the opening side edge of the outer ring belt-like wall on the opposite side of the transparent window to balance the axial direction The outer rotor's rotational balance is adjusted by the large opening for cooling ventilation , so the outer rotor can be made without changing the size of the conventional cooling ventilation opening and providing a notch without compromising the overall size and compactness. A good rotation balance can be maintained.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of a main part showing the structure of the outer rotor type engine generator 1 of the present embodiment.
[0017]
The flywheel rotor 3, which is an outer rotor that also serves as a flywheel, is formed in the shape of a bowl with a bottomed cylinder from a disk-like bottom wall 4 and an outer ring belt-like wall 5, and the bottom wall 4 is connected to the drive shaft 2. It is fitted through a sleeve 7 and is rotatably supported integrally with the drive shaft 2.
[0018]
Eighteen magnets 6 are arranged and attached to the inner peripheral surface of the outer ring-shaped wall 5 in the circumferential direction.
The magnet 6 is configured such that the N pole and the S pole are polarized on the outer peripheral side and the inner peripheral side, and the adjacent magnets 6 and 6 have different polarities facing each other (see FIG. 6).
[0019]
A stator 10 is accommodated in an internal space facing the magnet 6 arranged in an annular shape.
In the stator 10, a stator core 11 fixed and supported at the center via a sleeve projects 27 salient poles 12 radially on the outer periphery, and a power generating coil 13 is wound around each salient pole 12.
Each salient pole 12 faces the magnet 6 through a minute gap.
[0020]
FIG. 3 shows a circuit diagram of the power generation circuit.
There are three types of generator coils 13, one of which is a three-phase generator coil 13 a connected to a regulator 16 via a three-phase full-wave rectifier circuit composed of six diodes 15, and the regulator 16 is connected to an inverter 17. The inverter 17 obtains an AC output at a commercial frequency (for example, 50 Hz or 60 Hz).
[0021]
Another type of single-phase power generation coil 13 b is connected to the power supply circuit 18 that drives the regulator 16 and the inverter 17.
The remaining three-phase power generation coils 13c are connected to a three-phase half-wave rectifier circuit composed of three diodes 19, and a DC output for battery charging or the like is obtained from the output of the rectifier circuit.
[0022]
In the outer rotor type engine generator 1 as described above, in the present embodiment, the flywheel rotor 3 has a shape as shown in FIGS. On the bottom wall 4 of the bottomed cylindrical flywheel rotor 3, four cooling ventilation openings 20a and 20b are formed at equal intervals around a circular hole into which the central sleeve 7 is fitted.
[0023]
The cooling ventilation openings 20a and 20b have a triangular shape with smoothly rounded corners, and one of the four cooling ventilation openings 20a and 20b has one cooling ventilation opening 20a and the other three cooling ventilation openings. The shape is slightly larger than 20b.
[0024]
The outer ring belt-like wall 5 of the flywheel rotor 3 has three magnetic penetrating holes as shown in FIGS. 5 and 6 on the opposite side to the large cooling ventilation opening 20a with respect to the center of rotation. Slit holes 21, 22, and 23 (lattice hatched portions in FIG. 5) that are windows are formed.
Then, a self-triggered ignition device 30 is disposed on the outer side facing the outer ring belt-shaped wall 5 (see FIG. 1).
[0025]
In FIG. 5, the upper and lower slit holes 21 and 23 are symmetrical in the vertical direction and are elongated in the axial direction. The upper and lower slit holes 21 and 23 are generally L-shaped with one end extending in a direction approaching each other. Is formed corresponding to the position where the two opposite side portions of the adjacent magnets 6 and 6 on the inner side can be seen from the outside, and the long axial width is slightly smaller than the magnet 6.
[0026]
The slit hole 22 sandwiched between the slit holes 21 and 23 is a rectangular hole that is provided on the opposite side in the axial direction from the circumferentially extending portion of the slit holes 21 and 23, and is slightly elongated in the circumferential direction. The inner magnet 6 is formed at a position directly above the circumferential direction.
[0027]
In FIG. 5, the upper and lower magnets 6 and 6 are supported on the outer ring belt-like wall 5 only by one side corresponding to the slit holes 21 and 23, respectively. Some of them correspond to the slit holes 21, 22 and 23, and the others are supported by the outer ring belt-like wall 5, so that the magnets 6 are reliably supported even if a large centrifugal force is applied to each magnet 6 during high-speed rotation. Can do.
[0028]
FIG. 6 shows a cross-sectional view perpendicular to the axial direction at the slit hole 22 (cross-sectional view taken along VI-VI in FIG. 5).
In FIG. 6, the magnetic field lines coming out from the vicinity of the center of the N pole on the outer circumference side of the center magnet 6 leak to the outside from the slit hole 22, and then from the slit holes 21 and 23 on both sides to the S pole on the outer circumference side of the adjacent magnets 6 and 6. It reaches.
[0029]
Further, the magnetic field lines coming out from the left and right sides of the outer peripheral side N pole of the central magnet 6 leak outside from the slit holes 21 and 23 on both sides, and then the outer peripheral side S of the adjacent magnets 6 and 6 from the same slit holes 21 and 23. To the pole.
[0030]
When the flywheel rotor 3 rotates, the magnetic field lines leaking to the outside rotate together with the self-triggered igniter 30 each time it passes through the self-triggered igniter 30 arranged outside the outer ring belt-like wall 5. The engine is ignited.
[0031]
As described above, slit holes 21, 22, 23 for penetrating magnetic force are formed in a part of the outer ring belt-like wall 5, and cooling of the bottom wall 4 located on the opposite side of the slit holes 21, 22, 23 with respect to the center of rotation. Since the ventilation opening 20a is an opening larger than the other three cooling ventilation openings 20b, the enlarged opening is adjusted so as to be balanced with the slit holes 21, 22, 23 and the rotation center. Thus, the rotation balance can be easily maintained.
[0032]
Since the rotation balance of the flywheel rotor 3 can be maintained with a simple structure in which the opening of one cooling ventilation opening 20a is formed large by using the cooling ventilation opening, the whole can be compactly and compactly assembled. Can do.
[0033]
As shown in FIG. 7, the flywheel rotor 3 is formed with a notch 25 on the opening side edge of the outer ring belt-like wall 5 opposite to the slit holes 21, 22, 23 with respect to the center of rotation. The balance of direction is adjusted.
[0034]
The notch 25 is on the same side as the cooling ventilation opening 20a having a large opening with respect to the center of rotation and is balanced in the axial direction. The cooling ventilation opening 20a including the notch 25 adjusts the rotation balance. doing.
[0035]
The self-trigger igniter 30 has an igniter 31 facing the outer peripheral surface of the outer ring belt-like wall 5.
The igniter 31 is formed by winding a primary coil 31a and a secondary coil 31b around a connecting portion between a pair of leg portions 40a and 40b of a U-shaped iron core 40, and the pair of leg portions 40a and 40b. The dimension between the insides is smaller than the dimension in the circumferential direction of the magnet 6, and the dimension between the outsides is formed larger than the dimension in the circumferential direction of the magnet 6 (see FIG. 1).
[0036]
FIG. 8 shows a circuit configuration of a self-triggered ignition device 30 having the igniter 31 integrally therewith.
Both ends of the primary coil 31a of the igniter 31 are connected to electric wires 32 and 33, respectively, the emitter terminals of the transistors 34 and 35 are connected to the electric wire 32, and the collector terminal of the transistor 34 and the transistor 35 are connected to the grounded electric wire 33. The other end of the resistor 36 connected to the collector terminal is connected.
[0037]
The base terminal of the transistor 34 is connected to the collector terminal of the transistor 35, and the base terminal of the transistor 35 is connected to the connection point of the resistors 37 and 38 connected in series between the wires 32 and 33.
On the other hand, one end of the secondary coil 31b of the igniter 31 is connected to one end of the spark plug 39, and the other end of the secondary coil 31b is connected to the other end of the spark plug 39 and grounded.
[0038]
When the flywheel rotor 3 rotates and the magnetic flux leakage portion formed by the slit holes 21, 22, and 23 reaches one leg 40a of the iron core 40 of the igniter 31, voltage is first applied to the primary coil 31a of the igniter 31. And when the emitter side of the transistor 34 becomes a positive potential and both the transistors 34 and 35 do not operate and the magnetic flux leakage part approaches the other leg part 40b of the iron core 40, the direction of the lines of magnetic force flowing through the U-shaped iron core 40 changes. On the other hand, a reverse voltage is generated and the collector side of the transistor 34 becomes a positive potential, the transistor 34 becomes conductive, and a primary current flows through the primary coil 31a.
[0039]
Then, the collector-emitter potential of the transistor 34 gradually rises as it approaches the leg 40b, and when the base voltage of the transistor 35 divided by the resistors 37 and 38 reaches the trigger voltage, the transistor 35 becomes conductive and the transistor 34 As a result, the primary coil 31a of the igniter 31 is instantaneously cut off. As a result, a high voltage pulse is induced in the secondary coil 31b of the igniter 31 and a spark can be generated in the spark plug 39.
[0040]
As described above, the outer rotor type engine generator 1 shown in the present embodiment is an engine generator in which the entire outer rotor using the flywheel rotor 3 in which the outer rotor also serves as a flywheel is miniaturized. This is a simple structure in which slit holes 21, 22, 23 for penetrating magnetic force are provided in a part of the rotor 3, and the magnetic force of the magnet 6 disposed on the inner periphery of the outer ring belt-like wall 5 of the flywheel rotor 3 is slit. The ignition power is taken out by an igniter 31 of a self-triggered igniter 30 that is led to the outside through the holes 21, 22, 23, and is arranged opposite to the outer side of the outer ring belt-like wall 5, and the spark plug 39 is taken once per revolution. Is sparking.
[0041]
The slit holes 21, 22, 23 for penetrating magnetic force provided in the outer ring belt-like wall 5 of the flywheel rotor 3 may be the minimum necessary holes, and the magnet 6 disposed on the inner circumference of the outer ring belt-like wall 5. Can be secured, and sufficient support strength can be ensured even if a large centrifugal force acts on the magnet 6 due to high-speed rotation.
[0042]
In addition, since a part of the generator output magnet 6 is used for ignition and ignition energy is obtained from an ignition power generation unit separately provided outside, the generation energy that can be used as a power source for the generator for ignition is obtained. A part of the power is not sacrificed, and a high generator output can be obtained efficiently.
[0043]
The outer rotor type engine generator 1 includes a slit hole 21, 22, 23 provided for guiding the magnetic force of the magnet 6 arranged on the inner side of the outer ring belt-like wall 5 of the flywheel rotor 3 to the outer side and the rotation center. On the other hand, with the simple structure in which the cooling ventilation opening 20a on the opposite side is formed large, the rotational balance of the flywheel rotor 3, that is, the outer rotor can be maintained well without impairing the overall compactness and compactness.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing the structure of an outer rotor type engine generator according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is a circuit diagram of a power generation circuit of the outer rotor type engine generator.
FIG. 4 is a front view of a flywheel rotor.
FIG. 5 is a view taken in the direction of arrow V in FIG. 4;
6 is a cross-sectional view taken along line VI-VI in FIG.
7 is a view taken along arrow VII in FIG. 4;
FIG. 8 is a circuit diagram of a self-triggered ignition device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Outer rotor type engine generator, 2 ... Drive shaft, 3 ... Flywheel rotor, 4 ... Bottom wall, 5 ... Outer ring-shaped wall, 6 ... Magnet,
10 ... Stator, 11 ... Stator core, 12 ... Salient pole, 13 ... Generator coil, 15 ... Diode, 16 ... Regulator, 17 ... Inverter, 18 ... Power supply circuit,
20a, 20b ... cooling ventilation openings, 21, 22, 23 ... slit holes, 25 ... notches,
30 ... Self-triggered ignition device, 31 ... Igniter, 32, 33 ... Electric wire, 34, 35 ... Transistor, 36, 37, 38 ... Resistance, 39 ... Spark plug, 40 ... Iron core.

Claims (1)

A stator in which a plurality of magnets are arranged on the inner circumference of an outer ring belt-like wall of an outer rotor formed in a bottomed cylindrical shape in the circumferential direction, and a multipolar power generation coil is wound in an internal space facing the magnet. In an outer rotor type engine generator containing
A power generation part for an engine ignition device is arranged opposite to the outer side of the outer ring belt-like wall of the outer rotor,
While forming a through-hole for penetrating the magnetic force to act the magnetic force of the magnet toward the power generation part for the engine ignition device in a part of the outer ring belt-like wall of the outer rotor,
Out of a plurality of cooling ventilation openings formed in the bottom wall portion that blocks between the sides of the outer ring belt-like wall of the outer rotor, the cooling ventilation formed on the opposite side to the transparent window for magnetic penetration and the rotation center Increase the opening for
A notch is provided on the opening side edge of the outer ring belt-like wall on the side opposite to the transparent window for penetrating the magnetic force with respect to the rotation center of the outer rotor,
An outer rotor type engine generator configured to adjust the rotational balance of the outer rotor.

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