JPH0419959Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a power generator that has a DC output, especially a power generator that is equipped with an armature winding for forming the DC output so that the electromagnetic force acting on the rotor during the DC output is equalized. It's about machines.

Conventionally, in generators that have the function of rectifying the generated alternating current voltage, converting it to direct current, and outputting direct current voltage, a center tap is provided and a rectifying element is provided on each side of each armature winding piece. There are many formulas. The armature winding pieces are often arranged symmetrically with respect to a line passing through the center line of the stator, and each armature winding piece is wound left and right with respect to the center line. Because this type of winding is used, when load current is flowing through one armature winding piece, the flow of load current is blocked by the rectifying element in the other armature winding piece, and the load current is reduced. It's starting to stop flowing. Therefore, the electromagnetic force (armature reaction) acting on the rotor is unevenly generated every half cycle. As a result, an unbalanced force due to magnetic imbalance acts on the rotor, causing magnetic vibration noise and rotor center runout.

The purpose of the present invention is to solve the above-mentioned problems, and to provide a generator in which the armature winding is applied so that the electromagnetic force generated during DC output acts evenly, thereby preventing the occurrence of magnetic imbalance. It is an object. This will be explained below with reference to the drawings.

Figure 1 is an explanatory diagram of a conventional engine-driven generator, Figure 2 is a simplified illustration of Figure 1, and Figure 3 is an illustration of a conventional engine-driven generator.
4 is a conventional winding diagram, FIG. 5 is an explanatory diagram of the generator according to the present invention, FIG. 6 is a simplified explanatory diagram of FIG. 5, and FIG. 7 is a diagram of the conventional generator. The equivalent circuit diagram, FIG. 8, shows a winding diagram of an embodiment of the present invention.

In FIG. 1, a rotor 2 rotates inside a stator 1, creating a rotating magnetic field. Thick line Z
indicates the axis of symmetry, and the armature winding piece A and the armature winding piece B are connected to the slot 5 provided in the stator 1.
are inserted symmetrically into each other. As clearly shown in FIG. 1B, the armature winding piece A and the armature winding piece B are present in the armature winding 6 on the stator 1 shown. Further, when the rotor 2 does not constitute a permanent magnet field as shown in FIG. 1A, a rotor winding 7 is wound around the rotor 2 as shown in FIG. 1B. Further, in FIG. 1B, 8 represents the generator rotating shaft, and 9 represents the engine side frame. In the illustrated configuration, the rotor 2 is cantilevered by the bearing 10 provided in the engine side frame 9. It is in a state of support.
One end of the armature winding piece A and the armature winding piece B are connected and taken out as a center tap terminal C, and are connected to the other terminals X and Y of the armature winding piece A and armature winding piece B, respectively. is connected to diodes 3 and 4. The cathodes of these diodes 3 and 4 are connected to each other and serve as a positive terminal U for direct current output. It goes without saying that the center tap terminal C serves as a negative terminal V for direct current output.

FIG. 2 is a simplified diagram of armature winding piece A and armature winding piece B in FIG. 1, and the reference numerals correspond to those in FIG. 1.

FIG. 3 is an equivalent circuit diagram of FIG. 1, and the symbols in the figure also correspond to those in FIG.

In FIGS. 1 to 3, when the rotor 2 rotates, the armature winding pieces A and B wound around the stator 1 are in a form that cuts the rotating magnetic field, and each armature winding piece A , B, an equal induced electromotive force is generated. When a load is connected to the DC output terminals U, V, the diodes 3, 4 cause the load current to alternately flow through the armature winding pieces A or B every half cycle. For example, when the flow of the load current is blocked by the diode 3, no electromagnetic force is generated by the armature winding piece A, but an electromagnetic force is generated by the armature winding piece B through which the load current flows.

Since conventional armature windings are wound on the left and right sides symmetrically about the axis of symmetry Z, electromagnetic force is generated unevenly, and an unbalanced force due to magnetic imbalance acts on the rotor 1, especially as shown in Fig. 1. B In a generator with a cantilever support structure as shown in the diagram, for example, in a motor generator driven by an engine, vibrations due to engine torque pulsations are compounded with this magnetic imbalance, causing excessive stress on the bearing portion of the rotor. add burden or
Problems such as increased rotor runout may occur.

Figure 4 shows a specific example of a conventional winding, in which the number of conductors is 176, the number of conductors in armature winding piece A is 88, and the number of conductors in armature winding piece B is 88. It is.
The numbers in the circles in the figure represent the number of conductors inserted into the slots.

By making changes to this winding, the present invention
The above-mentioned drawbacks are solved by applying the electromagnetic force described above evenly.

In Figure 8, an armature winding piece with 44 conductors
A ₁ and armature winding piece B ₁ with 44 conductors are shown in Figure 5.
It is inserted into each slot 5 of the stator 1 shown in FIG. The remaining 88 conductors are armature winding piece A ₂ with 44 conductors and armature winding piece B ₂ with 44 conductors,
Insert the conductor of armature winding piece B ₂ into each slot into which the conductor of armature winding piece A 1 is inserted, and insert the conductor of armature winding piece B ₂ into each slot into which the conductor of armature winding piece B ₁ is inserted. Insert the conductor of the winding piece A ₂ . Note that center tap C is extracted from the connection point between armature winding pieces _B1 and _B2 , and terminals X and Y are extracted from armature winding pieces _A1 ,
Take it out from A ₂ .

Figure 5 shows this type of winding.
This is the generator shown in FIG. In FIGS. 5 to 7, A ₁ and A ₂ represent armature winding pieces A ₁ and A ₂ , and B ₁ and B ₂ represent armature winding pieces B ₁ and B ₂ . Code 1, 3 to 5, X, Y, C,
U and V correspond to those in FIG.

As is clear from Figures 6 and 7, when a load is connected between U and V and a load current flows through the armature winding piece, for example, when the load current flows through the diode 3, the armature winding piece A ₁ and the armature winding piece B ₁ , and this causes electromagnetic force to be generated by each armature winding piece A ₁ and B ₁ . However, the armature winding pieces
Since A ₁ and B ₁ are wound symmetrically on the left and right with respect to the axis of symmetry Z, the above electromagnetic force acts evenly, eliminating the magnetic imbalance, and the rotor (not shown in Figure 5) The imbalance will not be multiplied by

A load circular current flows through diode 4, and the armature winding piece
Even if electromagnetic force is generated by A ₂ and B ₂ , the magnetic unbalance is resolved and no unbalanced force is applied to the rotor, as described above. Although the above description has been made for a rotating field type in which the armature winding pieces are fixed and the magnetic field rotates, it goes without saying that this also applies to an armature rotating type in which the armature side is rotated. As for the number of conductors in the armature winding piece, it is not necessarily necessary to insert exactly half the number of conductors into the slots corresponding to the electrical angular positions that are substantially shifted by 180 degrees; if it is approximately half, the electromagnetic force acting on the rotor is evenly distributed, so the imbalance of electromagnetic force is eliminated.

As explained above, according to the present invention, the center
By inserting half the conductors of each armature winding strip with taps into slots corresponding to electrical angular positions offset by substantially 180°, along with the remaining conductors of each armature winding strip, the DC output This eliminates the magnetic imbalance that sometimes acts on the rotor, creating a generator that does not generate magnetic vibration or rotor runout.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional generator with DC output, Fig. 2 is a simplified explanatory diagram of Fig. 1, and Fig. 3 is an explanatory diagram of a generator with a conventional DC output.
Figure 4 is a conventional winding diagram, Figure 5 is an explanatory diagram of the generator according to the present invention, Figure 6 is a simplified explanatory diagram of Figure 5, and Figure 7 is the circuit of Figure 5. 8 shows a winding diagram of an embodiment of the present invention. In the figure, 1 is a stator, 2 is a rotor, 3 and 4 are diodes, 5 is a slot, A, A ₁ , A ₂ , B,
B ₁ and B ₂ represent armature winding pieces.

Claims (1)

[Scope of utility model registration request] A generator in which a center tap is formed at the connection part of each armature winding piece connected in series, and a half-wave rectifier is provided on each side of each armature winding piece to form a DC output part. In this step, the conductor of each armature winding piece is divided into two conductor groups, and the two conductor groups of each armature winding piece are inserted into slots corresponding to positions substantially shifted by 180°. A generator characterized in that the electromagnetic force from each armature winding piece acts equally by inducing voltages that are 180° different in phase from each other.