JPH073817Y2 - Generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a generator, and in particular, a circular opening is formed in a stator core, and a magnetic pole is provided so as to face the inner peripheral surface of the stator core. A rotor is rotatably arranged in the opening so as to face the magnetic pole on the stator side through a gap, and the rotor is rotated so that the power generation output is taken out from the armature coil wound around the stator core. Regarding the generator.

[Outline of device]

The present invention rectifies an alternating current output obtained as a power generation output by a rectifier circuit, and uses the rectified direct current as an alternating current again by an inverter circuit to take out an alternating current power source of a desired frequency. It is arranged in a cover that covers the circular opening of the stator core to be received, whereby the circuit portion of the generator is compactly attached to the generator.

[Conventional technology]

By combining the engine and the generator and driving the generator by the engine, it becomes possible to extract the power generation output through the armature coil of the generator. In particular, by using an inversion type magnet generator with an armature coil provided on the stator side of the generator, it is possible to take out the power generation output through a stationary generator coil without passing through a brush or slip ring. .

[Problems to be solved by the invention]

In the case of downsizing a generator having a predetermined power generation output, a method in which the number of magnetic poles is a multipole and a high frequency AC generator is considered. The high-frequency AC power supply obtained by such a generator can be once converted into DC power, and then converted into AC power again by the inverter circuit, whereby an AC power supply having the same frequency as the commercial power supply can be obtained. Therefore, in such a case, a rectifier circuit or an inverter circuit must be provided in the generator. Therefore, conventionally, the elements constituting such a circuit are housed in a casing, and the casing is fixed to the outside of the generator. Therefore, according to the conventional generator, there is a drawback that a dedicated case for housing the circuit portion is required, and this case is an obstacle when traveling to the outside.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a generator capable of omitting a dedicated case for housing a circuit unit.

[Means for solving problems]

According to the present invention, a circular opening is formed in a stator core and a magnetic pole is provided so as to face the inner peripheral surface of the stator core. The magnetic pole on the rotor side is rotated in the opening so as to face the magnetic pole on the stator side via an air gap. In a generator in which a rotor is arranged as much as possible and the rotor is rotated to extract a power generation output from an armature coil wound around the stator core, the power generation output is rectified by a rectifier circuit and rectified. The direct current is converted into an alternating current by the inverter circuit to take out an alternating current power source having a desired frequency, and the rectifying circuit and the inverter circuit are arranged in a cover that covers the circular opening of the stator core.

[Action]

Therefore, according to the present invention, it becomes possible to house the circuit components that form the rectifier circuit and the inverter circuit in the cover of the stator core, and not only does a special case for housing the circuit unit become unnecessary, but also the circuit With the case that stores the parts, it is possible to prevent problems such as business trips on the side of the generator.

〔Example〕

FIG. 1 shows an overall configuration of a generator according to an embodiment of the present invention, which generator includes a stator core 10. The stator core 10 has a flat rectangular parallelepiped shape and has a circular opening 11 in the center thereof. A rotor 12 is rotatably arranged in the opening 11. The rotor 12 is fixed to the end of the crankshaft 13, is fitted into the tapered portion 14 at the tip of the shaft 13, and is fixed by the nut 15. A cooling fan 16 is attached to the back side of the rotor 12, and a circular opening 11 on the front side of the stator core 10 is closed by a cover 17. The cover 17 has screw insertion holes 18 at its four corners, as shown in FIG.

Next, the internal structure of the generator will be described. As shown in FIG. 5, 24 slots 20 are formed in the circular opening 11 of the stator core 10 at a predetermined pitch in the circumferential direction, and 24 teeth 21 are formed by these slots 20. ing. The tips of the teeth 21 form the magnetic poles 22 on the stator side, and the armature coils 23 are wound around the teeth 21, respectively. The armature coil 23
As shown in FIG. 6, there are three phases, and the U-phase, V-phase, and W-phase coils are sequentially wound alternately around the tooth 21 in the circumferential direction. Also stator core
10 is configured by stacking punched thin silicon steel plates to reduce iron loss at high frequencies. Mounting holes 24 are provided at the corners of the stator core 10, and these holes 24 allow screws to be installed.
25 is used to attach the cover 17 (see FIG. 1).

On the other hand, the outer peripheral side of the rotor 12 is composed of a laminated body of iron plates or a cast iron product, and 16 magnets 27 are embedded in the rotor 12 at equal intervals in the circumferential direction. In addition, the magnets 27 are alternately inserted so that the same poles face each other, whereby 16 magnetic poles are formed on the outer peripheral surface of the rotor 12.
28 are to be formed. The center side of the rotor 12 is made of a non-magnetic material made of aluminum alloy or resin, and the center side portion forms the fitting portion 29. As shown in FIG. 3, a tapered hole 30 is formed in the fitting portion 29, and the tapered portion 14 of the crankshaft 13 is fitted into the tapered hole 30 and fixed by the nut 15. ing.

As described above, the generator according to the present embodiment is an inversion type magnet generator, and the rotor 12 has two poles and the stator core 10 has three poles.
With a so-called three-phase configuration that serves as a pole, a high-frequency three-phase output is taken out by the armature coil 23. The U-phase, V-phase, and W-phase coils of the armature coil 23 are connected to the rectifier circuit 33 as shown in FIG. 6, and the output side of the rectifier circuit 33 is connected to the regulator circuit 34. The output terminal of the regulator circuit 34 is connected to the inverter circuit 35, and the output of the inverter circuit 35 is taken out by the output terminal 36.

The circuit components of the rectifier circuit 33, the regulator circuit 34, and the inverter circuit 35 are the circuit board shown in FIG.
It is supposed to be mounted on 37. The circuit board 37 is arranged in the cover 17 shown in FIGS. 1 and 3,
Moreover, the circuit elements on the circuit board 37 are molded and sealed with the resin 38. The cover 17, which holds and holds the circuit board 37 in this way, has an air introduction port 39 in its central portion and also has an air introduction port 40 in its peripheral portion (see FIGS. 1 and 4).

In such a generator, a high magnetic flux density can be secured even by using an inexpensive magnet 27 such as ferrite without using an expensive rare earth magnet due to the structure of the rotor 12. Further, since the magnet 27 is sandwiched by magnetic materials, leakage of magnetic flux is reduced. Further, the air gap can be made small because the magnetic poles 22 at the tips of the teeth 21 of the stator core 10 and the magnetic poles 28 of the rotor 12 face each other. Incidentally, when the magnet directly faces the air gap, the air gap becomes large due to variations in the thickness and adhesion of the magnet. Also, since the magnet 27 is sandwiched by magnetic materials, the output increase can be adjusted by the stacking thickness ratio. Further, since it is an inversion type generator, there is almost no leakage of magnetic flux even if the product thickness is increased, and the output can be effectively improved.

Since the core and the magnet 27 of the rotor 12 are integrally molded with non-ferrous metal or resin to form the fitting portion 29, the strength against damage is very large, and the balance is good, and the rotor is an abduction type. Compared with this, the moment of inertia becomes smaller, which is advantageous in strength. In addition, the stator core 10
Since the slots are arranged on the outer peripheral side, the area of the slot 20, that is, the winding space can be made large, and the winding becomes easy. It is not necessary to output the 24-pole armature coil 23 as one output, and in the case of an engine generator, a power source for battery charging as an auxiliary power source or another power source such as a power winding of an electronic circuit such as the inverter 35 It is also possible to use.

As shown in FIG. 6, the output of the three-phase armature coil 23 is rectified by the rectifier circuit 33 and regulated by the regulator circuit 34, and the inverter circuit 35 adjusts the voltage at the same frequency as the commercial power source, that is, 100V. , 50Hz
It is converted to and output from the output terminal 36.

The rectifier circuit 33, the regulator circuit 34, and the inverter circuit 35 are mounted on the circuit board 37 in the cover 17 and sealed by the resin 38.
The cover 17 is fixed to the stator core 10 by screws 25 which are inserted through the screw insertion holes 18 at the four corners. When the generator is rotated, the cooling air is blown by the fan 16 provided in the rotor 12 on the center side and the outer peripheral side of the case 17.
It is introduced into the case 17 through 9, 40, and efficiently cools the armature coil 23 on the stator side, the surface of the rotor 12, and the air gap. Therefore, while being excellent in cooling effect, by enclosing the circuit part in the case 17,
It is possible to achieve downsizing of the generator without the need for a dedicated case. Since the magnet 27 on the rotor 12 side has a large temperature gradient, cooling it by the fan 16 greatly affects the output increase. Therefore, the resin to be encapsulated 38
Is preferably a resin having a good thermal conductivity.

[Effect of device]

As described above, according to the present invention, the generated output is rectified by the rectifier circuit, and the rectified direct current is converted to the alternating current by the inverter circuit to take out the AC power source of the desired frequency. It is arranged in a cover that covers the circular opening. Therefore, it is possible to easily obtain the same power supply as the commercial power supply, and by storing the circuit part in the cover, a special case becomes unnecessary, and
The generator can be made compact.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the entire structure of a generator according to an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. Is a plan view, FIG. 5 is a front view of the generator with the cover removed, and FIG. 6 is a circuit diagram showing a circuit of this generator. In the reference numerals used in the drawings, 10 ... Stator core 11 ... Circular opening 12 ... Rotor 16 ... Cooling fan 17 ... Cover 21 ... Teeth 22 ... Magnetic pole 23 ... Armature coil 25 ... Screw 27 ... Magnet 28 ... Magnetic pole 33 ... Rectifier circuit 34 ... Regulator circuit 35 ... Inverter circuit 37 ... Circuit board 38 ... Resin 39, 40 ... Air inlet.

Claims (1)

[Scope of utility model registration request] 1. A circular opening is formed in a stator core, a magnetic pole is provided so as to face the inner peripheral surface of the circular opening, and the magnetic pole on the rotor side faces the magnetic pole on the stator side with an air gap in the opening. In a generator in which a rotor is rotatably arranged and the rotor is rotated to extract a power generation output from an armature coil wound around the stator core, the power generation output is rectified by a rectification circuit and rectified. The rectified circuit and the inverter circuit are arranged in a cover that covers the circular opening of the stator core by converting the generated direct current into an alternating current by an inverter circuit to extract an alternating current power source having a desired frequency. And a generator.