JPH11178299A - Outer-rotor engine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer-rotor engine generator in which the rotation balance of an outer rotor can be maintained satisfactorily, while an ignition power supply is taken out with a simple structure by a method, wherein the magnetic force for a magnet arranged on the inner side of the outer ring belt-shaped wall of the outer rotor is guided to the outside via a clearance window. SOLUTION: In an outer-rotor engine generator, a plurality of magnets 6 are arranged over the circumferential direction on the inner circumference of the outer ring belt-shaped wall 5 of an outer rotor 3 which is formed as a bottomed cylindrical shape, and a stator on which multipolar power-generation coils are wound is housed in an inside space which is faced with magnets 6. The outer-rotor engine generator is constituted in such a way that a power-generation part for an engine ignition device is arranged, so as to be faced with the outside of the outer ring belt-shaped wall 5 of the outer rotor 3, that clearance windows 21, 22, 23, for magnetic-force passage, by which magnetic forces of the magnets 6 are made to act toward the power-generation part for the engine ignition device are formed in a part of the outer ring belt-shaped wall 5 of the outer rotor 2, so that dimensions of a plurality of openings 20a, 20b, for cooling ventilation, which are formed in the bottom wall part 4 used to close parts between side parts of the outer ring belt-shaped wall 5 of the outer rotor 3 are made nonuniform and that the rotation balance of the outer rotor 3 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an outer rotor type engine generator.

[0002]

2. Description of the Related Art In recent years, a multipolar generator in which magnets are arranged on the inner peripheral surface of an outer rotor has been frequently used as a power generating portion of a portable generator or the like that extracts a commercial frequency output by inverter control. Was.

When the outer rotor type multi-pole generator is driven by the engine, the outer rotor can be used as a flywheel rotor that also serves as the flywheel of the engine. It is not necessary to provide a flywheel, and the entire engine generator can be downsized.

[0004]

On the other hand, however, it is quite difficult to use a conventional external ignition device such as a self-triggering ignition device in which a magnet is attached to the outer periphery of a flywheel to extract ignition energy. There is a problem that is difficult.

That is, in the case of the outer rotor, the diameter of the outer rotor cannot be reduced in order to obtain sufficient energy because the magnet for power generation is disposed on the inner peripheral surface. When a magnet is attached to the outer periphery of a large-diameter outer rotor (for example, JP-A-61-40463), it is difficult to obtain the supporting strength of the magnet and the size of the outer rotor is increased.

For this reason, if an attempt is made to use the outer rotor as a flywheel of an engine, for example,
As described in Japanese Patent No. 6219, some poles of the multipolar power generation section inside the outer rotor must be used exclusively for ignition so as to take out the power of the ignition device. And become expensive,
There is a problem in that a part of the multipolar power generation unit that should be able to take out a high output is used for ignition, thereby sacrificing the power generation output.

Accordingly, the applicant of the present application has filed an earlier application (Japanese Patent Application No.
No. 9309), the magnetic force of a magnet disposed inside the outer ring-shaped band wall of the outer rotor is guided to the outside through the transparent window, and the power generation for the engine ignition device disposed opposite to the outer ring-shaped band wall. Proposes an engine generator in which the ignition power can be taken out by a section.

According to this, the ignition power source can be taken out with a simple structure without sacrificing the power generation output.
When a transparent window is formed by removing a part of the outer ring-shaped wall having a large thickness, there is a problem in maintaining a rotational balance of the outer rotor that rotates at a high speed.

The present invention has been made in view of the above point, and an object thereof is to guide the magnetic force of a magnet disposed inside the outer annular band-shaped wall of the outer rotor to the outside through a transparent window. Another object of the present invention is to provide an outer rotor type engine generator capable of maintaining a good rotational balance of the outer rotor while taking out an ignition power supply with a simple and simple structure.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a plurality of circumferentially extending outer circumferential belt-like walls of an outer rotor formed in a bottomed cylindrical shape. In an outer rotor-type engine generator in which a magnet is arranged and a stator in which a multi-pole power generation coil is wound is housed in an internal space facing the magnet, the outer rotor-type engine generator faces the outer ring-shaped outer wall of the outer rotor. A power window for the engine ignition device is disposed, and a transparent window for magnetic force penetration for applying a magnetic force of the magnet toward the power generation portion for the engine ignition device is formed on a part of the outer ring-shaped wall of the outer rotor. And adjusting the rotational balance of the outer rotor by making the sizes of the plurality of cooling ventilation openings formed in the bottom wall portion closing between the side portions of the outer annular band-shaped wall of the outer rotor non-uniform with respect to the rotation center axis. like Was the form the outer rotor type engine generator.

A transparent window for magnetic force penetration is provided in a part of the outer annular band-shaped wall of the outer rotor having a bottomed cylindrical shape, and the size of the cooling ventilation opening provided on the bottom wall of the outer rotor is made non-uniform. Since the rotation balance of the outer rotor is adjusted, it is possible to maintain a good rotation balance of the outer rotor without impairing the overall downsizing with a simple structure in which only the size of the conventional transparent window is changed.

According to a second aspect of the present invention, in the outer rotor type engine generator according to the first aspect, of the plurality of cooling ventilation openings, the opposite side to the transparent window for magnetic force penetration and the center of rotation. The rotation balance of the outer rotor is adjusted by enlarging the cooling ventilation opening formed in the outer rotor.

[0013] Since it is sufficient to form the cooling ventilation opening, which is large with respect to the transparent window of the outer rotor, on the side opposite to the center of rotation, a good rotation balance can be easily achieved.

According to a third aspect of the present invention, in the outer rotor type engine generator according to the first or second aspect, the outer ring opposite to the magnetically penetrating window with respect to the rotation center of the outer rotor. A notch is provided on the opening side edge of the strip-shaped wall.

An axial balance can be adjusted by providing a notch on the opening side edge opposite to the bottom wall in the axial direction with respect to the unevenness of the size of the cooling ventilation opening provided on the bottom wall of the outer rotor. can do.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a main part showing a structure of an outer rotor type engine generator 1 of the present embodiment.

A flywheel rotor 3, which is an outer rotor also serving as a flywheel, is formed in a bottomed cylindrical bowl shape from a disc-shaped bottom wall 4 and an outer ring band-shaped wall 5, and the bottom wall 4 is driven. It is fitted to the shaft 2 via a sleeve 7 and is supported so as to be rotatable integrally with the drive shaft 2.

Eighteen magnets 6 are arranged and mounted on the inner peripheral surface of the outer annular belt-shaped wall 5 in the circumferential direction. The magnet 6 has an N-pole and an S-pole polarized on the outer peripheral side and the inner peripheral side.
6 are configured so that opposite polarities are different from each other (see FIG. 6).

A stator 10 is accommodated in an internal space facing the magnets 6 arranged in an annular shape. The stator 10
Stator core 11 whose center is fixed and supported via a sleeve
Has radially projecting 27 salient poles 12 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 via a minute gap.

FIG. 3 shows a circuit diagram of the power generation circuit. There are three types of power generating coils 13, one of which is a three-phase power generating coil 13a.
Is 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.
An AC output of the commercial frequency (for example, 50 Hz or 60 Hz) is obtained.

Another type of single-phase power generation coil 13b is connected to a power supply circuit 18 for driving the regulator 16 and the inverter 17. And the remaining types of three-phase power generating coils 13c
Is connected to a three-phase half-wave rectifier circuit composed of three diodes 19, and obtains a DC output for battery charging or the like by the output of the rectifier circuit.

In the outer rotor type engine generator 1 as described above, in the present embodiment, the flywheel rotor 3 is shaped as shown in FIGS. In the bottom wall 4 of the bottomed cylindrical flywheel rotor 3, cooling ventilation openings 20a and 20b are formed at four regular intervals around a circular hole into which the central sleeve 7 is fitted.

The cooling ventilation openings 20a and 20b have a triangular shape with smoothly rounded corners, and have four cooling ventilation openings 20.
One of the cooling ventilation openings 20a has a shape one size larger than the other three cooling ventilation openings 20b.

The outer annular band-shaped wall 5 of the flywheel rotor 3 has a portion, as shown in FIG. 5 and FIG.
Slit holes 21, 22, 23, which are two transparent windows for magnetic force penetration
(The lattice-shaped hatch portion in FIG. 5) is formed. A self-triggering ignition device 30 is provided on the outside facing the outer annular belt-shaped wall 5.
Are arranged (see FIG. 1).

In FIG. 5, the upper and lower slit holes 21 and 23 are
It is vertically symmetrical, elongated in the axial direction, and has a substantially L-shape with one end extending in a direction approaching each other. Each slit hole 21, 23 is opposed to the inner adjacent magnets 6, 6. Do 2
One side portion is formed corresponding to the position seen from the outside, and the long axial width is slightly smaller than the magnet 6.

Slit hole sandwiched between both slit holes 21 and 23
Reference numeral 22 denotes a rectangular hole slightly offset in the circumferential direction and provided at a position directly above the inner magnet 6 in the circumferential direction. It is formed.

In FIG. 5, the upper and lower magnets 6, 6 are mostly supported on the outer ring-shaped wall 5 only on one side corresponding to the slit holes 21, 23, respectively. And a part of the center corresponds to the slit holes 21, 22, and 23, and the other part is supported by the outer annular band-shaped wall 5, so that even if a large centrifugal force acts on each magnet 6 during high-speed rotation, the magnet 6 can be securely held. Can be supported.

FIG. 6 is a sectional view taken along the axial direction perpendicular to the slit hole 22 (a sectional view taken along line VI-VI in FIG. 5). In FIG. 6, the lines of magnetic force exiting from the vicinity of the center of the N pole on the outer periphery of the center magnet 6 leak out from the slit holes 22 and then from the slit holes 21 and 23 on both sides to the S pole on the outer periphery of the adjacent magnets 6 and 6. Reach.

Lines of magnetic force exiting from the left and right sides of the N pole on the outer peripheral side of the center magnet 6 leak to the outside from the slit holes 21 and 23 on both sides, and then the adjacent magnets 6 and 6 from the same slit holes 21 and 23.
To the south pole on the outer periphery side.

Due to the rotation of the flywheel rotor 3, the lines of magnetic force leaking to the outside rotate together with the outer ring band-like wall 5
The ignition operation of the engine is performed by the self-triggering ignition device 30 every time the engine passes through the self-triggering ignition device 30 arranged outside the vehicle.

As described above, the slit holes 21, 22, and 23 for magnetic force penetration are formed in a part of the outer annular band-shaped wall 5, and the bottom wall located on the opposite side to the slit holes 21, 22, and 23 with respect to the center of rotation. Since the cooling ventilation opening 20a of No. 4 is an opening which is larger than the other three cooling ventilation openings 20b, the enlarged portion of the opening is balanced with the slit holes 21, 22, and 23 with respect to the rotation center. By adjusting, the rotation balance can be easily maintained.

Since the rotation balance of the flywheel rotor 3 can be maintained by using a cooling ventilation opening with a simple structure in which one of the cooling ventilation openings 20a is formed to be large, the whole is small and compact. Can be put together.

In this flywheel rotor 3, as shown in FIG. 7, a notch 25 is formed on the opening side edge of the outer annular band-shaped wall 5 opposite to the slit holes 21, 22, 23 with respect to the center of rotation. To adjust the axial balance.

The notch 25 is located 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, and the cooling ventilation opening 20a including the presence of the notch 25 rotates. Adjusting the balance.

The self-triggering ignition device 30 has an igniter 31 facing the outer peripheral surface of the outer annular belt-shaped wall 5.
The igniter 31 includes a pair of legs 40 of a U-shaped iron core 40.
a primary coil 31a and a secondary coil 31b
The dimension between the inside of the pair of legs 40a and 40b is smaller than the dimension in the circumferential direction of the magnet 6, and the dimension between the outsides is larger than the dimension in the circumferential direction of the magnet 6. (See FIG. 1).

FIG. 8 shows a circuit configuration of the self-triggering ignition device 30 having the igniter 31 integrally. Both ends of the primary coil 31a of the igniter 31 are connected to electric wires 32 and 33, respectively.
And the other end of the resistor 36 connected to the collector terminal of the transistor 34 and the collector terminal of the transistor 35 is connected to the grounded wire 33. .

The base terminal of the transistor 34 is connected to the collector terminal of the transistor 35.
The base terminal is a resistor 3 connected in series between wires 32 and 33.
Connected to connection points 7 and 38. Meanwhile igniter 31
One end of the secondary coil 31b is connected to one end of the ignition plug 39, and the other end of the secondary coil 31b is connected to the other end of the ignition plug 39 and grounded.

When the flywheel rotor 3 rotates, the magnetic flux leakage portion formed by the slit holes 21, 22, and 23 forms an igniter.
When one of the legs 40a of the iron core 31 of the igniter 31 reaches the primary coil 31a of the igniter 31, a voltage is generated and the transistor 34 is turned on.
The emitter side of the core 40 becomes positive potential, and both transistors 34 and 35 do not operate. Then, the magnetic flux leakage part is the other leg of the core 40.
When approaching 40b, the direction of the lines of magnetic force flowing through the U-shaped iron core 40 is reversed, and a voltage in the opposite direction is generated, the collector side of the transistor 34 becomes positive potential, the transistor 34 conducts, and the primary current flows through the primary coil 31a. Flows.

The collector-emitter potential of the transistor 34 gradually rises as it approaches the leg 40b,
When the base voltage of the transistor 35 divided by 37 and 38 reaches the trigger voltage, the transistor 35 is turned on, the transistor 34 is turned off, and the primary coil 31a of the igniter 31 is turned on.
Is instantaneously shut off, and as a result, a high voltage pulse is induced in the secondary coil 31b of the igniter 31 to generate a spark in the spark plug 39.

As described above, the outer rotor type engine generator 1 shown in the present embodiment is a downsized engine generator using the flywheel rotor 3 whose outer rotor also serves as a flywheel. And slit holes 21 and 2 for magnetic force penetration in a part of the flywheel rotor 3
This is a simple structure in which the outer ring 2 and 23 are provided, and the magnetic force of the magnet 6 arranged on the inner periphery of the outer ring band-shaped wall 5 of the flywheel rotor 3 is guided outward through the slit holes 21, 22 and 23, and the outer ring is formed. Self-triggering ignition device 30 disposed opposite to the outside of the band-like wall 5
The ignition power is taken out by the igniter 31 of the above, and the ignition plug 39 is sparked once per rotation.

The slit holes 21, 22, and 23 for penetrating the magnetic force provided on the outer ring-shaped band wall 5 of the flywheel rotor 3 may be the minimum necessary holes, and are arranged on the inner periphery of the outer ring-shaped band wall 5. There is no problem in supporting the magnet 6, and sufficient supporting strength can be ensured even if a large centrifugal force acts on the magnet 6 by high-speed rotation.

Since a part of the generator output magnet 6 is used for ignition to obtain ignition energy from an ignition power generation unit provided separately outside, it can be used as a generator power supply for ignition. A high generator output can be obtained efficiently without a portion of the generated energy being sacrificed.

The outer rotor type engine generator 1 has slit holes 21, 22, 23 provided to guide the magnetic force of the magnets 6 arranged inside the outer ring-shaped band wall 5 of the flywheel rotor 3 to the outside. And the flywheel rotor 3 has a simple structure in which the cooling ventilation opening 20a on the opposite side to the rotation center is formed large without impairing the overall size and compactness.
That is, the rotation balance of the outer rotor can be favorably maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a structure of an outer rotor type engine generator according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the 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 as seen from the arrow V in FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a view on arrow VII in FIG. 4;

FIG. 8 is a circuit diagram of a self-triggering ignition device.

[Description of Signs] 1 ... Outer rotor type engine generator, 2 ... Drive shaft, 3
... Flywheel rotor, 4 ... Bottom wall, 5 ... Outer ring belt-like wall,
6 ... magnet, 10 ... stator, 11 ... stator core, 12 ... salient pole,
13… Generating coil, 15… Diode, 16… Regulator,
17 ... Inverter, 18 ... Power supply circuit, 20a, 20b ... Cooling ventilation opening, 21,22,23 ... Slit hole, 25 ... Notch, 30 ... Self-triggering ignition device, 31 ... Igniter, 32,33 ... Electric wire, 34, 35 ... transistor, 36, 37, 38 ... resistance, 39 ... spark plug, 40 ... iron core.

Claims (3)

[Claims] 1. A plurality of magnets are arranged in a circumferential direction on an inner periphery of an outer annular band-shaped wall of an outer rotor formed in a bottomed cylindrical shape, and a multipolar power generating coil is provided in an internal space opposed to the magnets. An outer rotor-type engine generator containing a wound stator, wherein a generator for an engine ignition device is disposed so as to face an outer ring-shaped band wall of the outer rotor, and an outer ring-shaped band wall of the outer rotor is provided. And forming a transparent window for magnetic force penetration for applying the magnetic force of the magnet toward the engine ignition device power generation unit, and at the bottom wall portion closing between the side portions of the outer annular band-shaped wall of the outer rotor. An outer rotor type engine generator, wherein the size of the plurality of cooling ventilation openings formed is made non-uniform with respect to the rotation center axis to adjust the rotation balance of the outer rotor. 2. The rotational balance of the outer rotor is increased by enlarging a cooling ventilation opening formed on a side opposite to the rotation center with respect to the transparent window for magnetic force penetration among the plurality of cooling ventilation openings. The outer rotor type engine generator according to claim 1, wherein the outer rotor type engine generator is configured to be adjusted. 3. A notch is provided at an opening side edge of an outer ring-shaped wall opposite to the transparent window for magnetic force penetration with respect to a rotation center of the outer rotor. Item 3. An outer rotor type engine generator according to item 2.