JPH0510540Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a generator that generates electromotive forces of different phases in two independent windings of the armature concentrated winding type that are wound at the same location. This relates to the structure of the generator.

(Prior Art) Conventionally, an armature concentrated winding type generator having two independent windings has a structure as shown in FIG. 14. That is, in FIG. 14, a U-shaped stator 2 is provided with magnetic pole parts 2a and 2b provided opposite to the rotor 1 that generates a magnetic field, and a yoke part 2c that integrally connects these magnetic pole parts 2a and 2b. The main winding 3 and the exciter winding 4 of the armature winding were wound around the yoke part 2c in a concentrated winding type.

(Problems to be solved by the invention) Since the stator 2 has a U-shaped stator structure in which the magnetic pole portions 2a and 2b are open, an induced induction occurs in the armature winding, that is, the main winding 3 and the exciter winding 4. The magnetic pole parts 2a, 2b vibrate due to the electromagnetic force that pulsates depending on the frequency of the electric power, making it difficult to maintain a gap between the rotor 1 and each magnetic pole part 2a, 2b, resulting in the problem of rotor contact. Furthermore, since the main winding 3 and the exciter winding 4 are wound at the same location, it is not possible to obtain voltages with different phases. It has been difficult to realize a generator with a brushless structure in which a capacitor is connected to the exciter winding 4 that generates voltage and the phase-advanced current is used to compensate for the load. Furthermore, since the main winding 3 and the exciter winding 4 are wound around the yoke part 2c of the same magnetic path,
As the load increases, the armature reaction causes an apparent increase in the magnetic resistance of the yoke portion 2c. Therefore, since the magnetic flux density of the yoke portion 2c decreases, the electromotive force induced in the exciter winding 4 decreases, and the load characteristics of the main winding 3 change as shown by the broken line in FIG. In addition to the winding characteristics, short circuit current does not flow, and as a result, motor starting characteristics are poor when starting a compressor or the like.

In addition, since the main winding 3 and the exciter winding 4 are exposed toward the outer circumference of the stator 2, a structure must be adopted to protect the windings, and as explained earlier, the structure of the stator 2 is U-shaped. Since it has a U-shaped open end, magnetic flux leaks at the U-shaped open end, causing a magnetic induction disturbance to external equipment.

The purpose of the present invention is to solve the above-mentioned drawbacks, and the stator core is formed into a closed type (external iron type), and a convex magnetic pole part is formed inside the closed stator core. In addition, it is an object of the present invention to provide a generator in which a slot is provided in the center of the magnetic pole portion, into which either the main winding or the exciter winding is wound.

(Means for Solving the Problems) Therefore, the generator of the present invention has a hollow space and an outer iron type structure, and has magnetic pole parts that respectively protrude toward the inner center so as to face each other. The stator includes a rotor that is rotatably supported and has salient poles facing the magnetic pole portions, and a second power generation winding is wound around each of the magnetic pole portions of the stator. salient pole is N
In an armature concentrated winding type generator in which a pole and a south pole are magnetized and a voltage is induced in the second power generation winding in response to the rotation of the rotor, the generator is magnetized into poles and south poles, and which are opposed to each other toward the inner center side. A slot is provided in the center of each of the magnetic pole parts protruding as shown in FIG. The first child I had with
and the other of the windings, inducing voltages of different phases between the first winding and the second winding, and between one and the other of the first windings. It is characterized by a structure that induces voltages with different phases. This will be explained below with reference to the drawings.

(Example) Fig. 1 is a longitudinal sectional view of an embodiment of a generator using the stator core according to the present invention, Fig. 2 is a front view of the stator core according to the present invention, Fig. 3,
Fig. 4 is an explanatory diagram of winding each winding around the stator of the stator core according to the present invention, and Fig. 5 is a winding diagram of the stator core according to the present invention.
The cross-sectional view taken along arrow XX in the figure, Figure 6 A to E are the first
Figure 7 is a vector diagram,
Fig. 8 is an explanatory diagram of the generated voltage waveform, Fig. 9 is a magnetic flux explanatory diagram explaining how the magnetic flux flows in the brushless generator, Fig. 10 is the load characteristic curve of the brushless generator, and Fig. 11 is based on the present invention. 12 and 13 are front views of other embodiments of the stator core.
FIG. 1 is an explanatory view of winding windings around the stator of the stator core according to the present invention shown in FIG. 1;

In FIG. 1, reference numeral 11 is a stator;
The stator 11 has stator cores 12 shown in FIG. 2 stacked together. As shown in FIG.
2d are formed, and slots 13a and 13b into which the windings are inserted are provided at the center of each of the magnetic poles 12a and 12b and the magnetic poles 12c and 12d. Using the slot 13a, as shown in FIG.
A first power generation winding W a1 (hereinafter, the first power generation winding will be referred to as a first winding for simplicity) is wound around the magnetic pole 12b, and a first winding W _a2 is wound around the magnetic pole _12b . It's being passed around. Similarly, using the slot 13b, the magnetic pole 1
The first winding W _a3 is wound around 2c, and the magnetic pole 12d
The first winding W _a4 is wound around. Then, a second power generation winding (hereinafter, the second power generation winding will be referred to as a second winding for simplicity) W _a1 is wound around the outer periphery of the first windings W _a1 and W _a2 , and the first A second winding W _b2 is wound around the outer periphery of the windings W _a3 and W _a4 . A rotor 14 around which a field winding 15 is wound is rotatably provided at the center of the stator 11. The above first winding W _a1 to W _a4 and the second winding W _b1 ,
For W _b2 , winding is concentrated on a square bobbin in advance.
For example, the first windings W _a1 and W _a2 are inserted into the magnetic poles 12a and 12b as shown in FIG. first winding
W _a3 and W _a4 are also magnetic poles 12c and 12 using the same procedure.
Insert into d. After winding the first windings W _a1 and W _a2 at predetermined positions, the second winding W _b1 is wound as shown _in FIG. ₄ . Insert and assemble around the outer periphery of the The second winding W _b2 is also inserted and assembled onto the outer periphery of the first windings W _a3 and W _a4 in exactly the same manner. The stator 11 wound with the first winding and the second winding has the structure shown in FIG. In Figure 5, all symbols are from Figure 1 and 2.
It corresponds to the one shown in the figure.

Now, the first winding W _a1 to W _a4 and the second winding
If W _b1 and W _b2 are connected so that the current flows in the direction shown in Figure 1, the voltage W・a generated across the first winding W _a and the voltage W・_b generated across the second winding W・_b The phase difference with the voltage W _b generated at both ends of is W・_a = W・_a1 +W・_a2 ( Or W・_a = W・_a3 +W・
_a4 ) W・_b = W・_b1 + W・_b2 , so W・_a has a phase difference of 90° with respect to W・_b .

However, in the above, W・_a1 , W・_a2 , W・_a3 , W・_a4
is the vector of the voltage generated in the first winding W _a1 to W _a4 , and W・_b1 , W・_b2 are the vectors of the voltages generated in the second winding W _a1 and W a4.
W is the vector of voltage generated at _a2 .

That is, as shown in FIG.
The voltage generated in the first winding W _a is delayed by 90° with respect to W _b , and the voltage generated in the first winding W _a and the second winding W _b is
A phase difference of 90° has occurred.

In this way, between the first winding and the second winding
Figure 6B shows how to connect wires that produces a 90° phase difference.
There are wiring methods shown in the diagrams. In any of these cases, the first winding W _a1 to W _a4 and the second winding
The windings W _a1 and W _b2 are connected so that current flows in the direction shown in FIG.

Next, in the above two-winding generator in which a phase difference of 90° is obtained between the first winding W _a and the second winding W _b , for example, the first winding W _a is wound as an exciter. When the second winding W _b is the main winding, the second winding W a can be connected to the first winding W _a by connecting a phase advance capacitor to both ends of the first winding W _a . Winding W _b
It is possible to flow a phase-advanced current that is in phase with the current. Therefore, load compensation can be performed in accordance with an increase in the load current flowing through the second winding W _b , that is, the main winding. That is, it is possible to create a brushless generator called the Nonaka type, in which both ends of the field winding 15 wound around the rotor 14 are short-circuited with diodes, and the counter electromotive force of the armature reaction is utilized.

Figure 9 shows a magnetic flux explanatory diagram explaining how the magnetic flux flows in a brushless generator, and symbols 11 to 14, W _a1 to W _a4 , W _b1 , and W _b2 correspond to those in Figure 1. ing. A diode 16 is connected to both ends of the field winding 15.

When a load current flows through the second winding W _b , that is, the main winding, the magnetic flux in the direction of the solid arrow shown in FIG. 9 due to armature reaction increases as the load current increases. On the other hand, in the first winding W _a , that is, the exciter winding, a leading phase current flows in the direction shown in the figure by a capacitor not shown, and a magnetic flux shown by a broken line is generated based on the leading phase current. The magnetic flux acts in a magnetizing direction increasing the magnetic flux generated by the field winding 15 of the rotor 14. Therefore, the 10th
As shown in the figure, the output voltage of the main winding is kept constant for a certain section of load current.

In addition, with respect to overload current, the magnetic resistance of the magnetic path around which the main winding, that is, the second winding _W The magnetic flux due to the advanced phase current flowing through each winding W _a becomes effective, and the field winding 1
5 generates an electromotive force and prevents a decrease in the magnetic field, so the load characteristic changes from the conventional entrainment characteristic type to the 10th
The drooping characteristic is a solid line as shown in the figure. Therefore, the short circuit current _Is can be ensured and good characteristics can be exhibited even under heavy loads such as motor startup.

In the case of the present invention, the capacitor current flowing through the exciter winding, that is, the first winding W _a , is less affected by the output voltage waveform.
It can be tuned to the next harmonic, and the capacitance of the capacitor can be relatively small.

In the above, the first winding W _a is made into an exciter winding,
Although the case where the second winding W _b is the main winding has been described, the same applies to the reverse case as well.

Furthermore, the stator core 12 is illustrated as a square core. It can also be made into a circular core.

FIG. 11 shows a front view of another embodiment of the stator core according to the present invention, which is formed symmetrically along the line segment Y-Y. Stator core 22
are magnetic poles 22a, 2 facing inside the square core.
2c are formed, and the magnetic poles 22a, 22c have slots 23a, 23 around which windings are wound as shown in the figure.
3b is provided. Since the stator 21 shown in FIG. 13 is constructed by combining two stator cores 22, a convex portion 24 and a concave portion 25 are provided at both ends of the square core.

When winding the windings, as shown in Fig. 12, the first windings W _a1 and W _a3 , which have been pre-wound in a concentrated manner around a rectangular bobbin, are inserted into the magnetic poles 22a and 22c. Stator 2 with first windings W _a1 and W _a3 inserted
Assemble two halves of 1 as shown in Figure 13.
Then, as shown in Figure 13, the second winding
W _b1 is inserted into the outer periphery of the first windings W _a1 and W _a2 and assembled. The other second winding W _b2 is inserted and assembled onto the outer periphery of the first windings W _a3 and W _a4 in exactly the same manner.

These first windings W _a1 to W _a4 and the second winding
By connecting W _b1 and W _b2 as explained above, the first winding W _a and the second winding W _b are connected.
The ability to generate voltages with a phase difference of 90° is exactly the same as the above explanation, and the explanation thereof will be omitted.

(Effects of the invention) As explained above, according to the invention, voltages with different phases can be generated by the armature concentrated winding type, and the generator has a simple structure and the windings can be easily assembled and replaced. Become. Since voltages with different phases are generated, it becomes possible to create a generator with a so-called Nonaka type brushless structure that utilizes armature reaction, and the output voltage can be kept constant. Since it has the characteristic of having a large short-circuit current, it can be used as a power source for motors that start up under heavy loads. Furthermore, since the stator core has an integral structure without an open end, a gap in the rotor is always ensured, and rotor contact does not occur. Furthermore, since the windings are not exposed toward the outer periphery of the stator, the windings can be protected. A quadrupole magnetic field can also be easily created by connecting the first winding W _a .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of a generator using the stator core according to the present invention, FIG. 2 is a front view of the stator core according to the present invention, and FIG.
Fig. 4 is an explanatory diagram of winding each winding around the stator of the stator core according to the present invention, and Fig. 5 is a winding diagram of the stator core according to the present invention.
The cross-sectional view taken along arrow XX in the figure, Figure 6 A to E are the first
Figure 7 is a vector diagram,
Fig. 8 is an explanatory diagram of the generated voltage waveform, Fig. 9 is a magnetic flux explanatory diagram explaining how the magnetic flux flows in the brushless generator, Fig. 10 is the load characteristic curve of the brushless generator, and Fig. 11 is based on the present invention. 12 and 13 are front views of other embodiments of the stator core.
FIG. 1 shows a winding explanatory diagram of winding each winding around the stator of the stator core according to the present invention, and FIG. 14 shows a longitudinal cross-sectional view of a generator using a conventional U-shaped stator core. In the figure, 1 is a rotor, 2 is a stator, 3 is a main winding, 4 is an exciter winding, 11, 21 are stators, 12, 22 are stator cores, 12a, 1
2b, 12c, 12d, 22a, 22c are magnetic poles,
13a, 13b, 23a, 23b are slots, 1
4 is a rotor, 15 is a field winding, 16 is a diode, W _a1 . W _a2 , W _a3 , W _a4 are the first windings, W _b1 ,
W _b2 represents the second winding.

Claims (1)

[Scope of Claim for Utility Model Registration] A stator that is formed into an outer iron type with a hollow space and has magnetic pole portions that respectively protrude toward the inner center so as to face each other, and salient poles that face the magnetic pole portions. and a rotor rotatably supported by the stator, a second power generation winding is wound around each of the magnetic poles of the stator, and the salient poles of the rotor are N.
In an armature concentrated winding type generator in which a pole and a south pole are magnetized and a voltage is induced in the second power generation winding in response to the rotation of the rotor, the generator is magnetized into poles and south poles, and which are opposed to each other toward the inner center side. A slot is provided in the center of each of the magnetic pole parts protruding as shown in FIG. and the other of the first winding provided between the first winding and the second winding, inducing voltages of different phases between the first winding and the second winding, and A generator characterized by having a structure that induces voltages of different phases between one side and the other side of a line.