JPS61266054A - Generator - Google Patents

Abstract

PURPOSE:To generate a voltage having a different phase in an armature concentrated winding die by forming a stator at an outer iron mold, and forming a slot at the center of a pole to wind one of a main winding and an exciter winding. CONSTITUTION:In a generator having a rotor 14 for generating a magnetic field and a stator 11 of an armature concentrated winding die, a stator core 12 is formed in an outer iron mold, and pairs of poles 12a-12d formed in a projecting shape at the inside. Slots 13a, 13b are formed at the center of the poles. Windings Wa1-Wa4 of one of the main and exciter windings are wound in the slots 13a, 13b, and the other windings Wb1, Wb2 are wound at the outside to generate voltages of different phases. Thus, a shortcircuiting current is increased, and an output voltage is held constantly.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a generator in which a main winding and an exciter winding are wound at the same location, and the electromotive forces generated in these two windings are in different phases. The present invention relates to a generator having:

(Prior Art) Conventionally, an armature concentrated winding type generator having two independent windings has a structure as shown in FIG. That is, in FIG. 8, a magnetic pole portion 2a is provided facing the rotor 1 that generates a magnetic field.

2b, and a yoke part 2C that integrally connects these magnetic pole parts 2a and 2b.
Main winding 3 of armature winding and exciter winding! 4 were wound 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, the armature winding, that is, the main winding 3. The magnetic pole parts 2a, 2b vibrate due to the electromagnetic force that pulsates according to the frequency of the induced electromotive force generated in the exciter winding 4, and it is difficult to maintain the gap between the rotor 1 and each magnetic pole part 2a, 2b. There was a drawback that rotor contact occurred. Also.

Since the main winding 3 and the exciter winding 4 are wound at the same location, voltages with different phases cannot be obtained.

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 a voltage different from that of the main winding 3, and load compensation is performed using the leading phase current of the capacitor. Furthermore, since the main winding vA3 and the exciter winding vA4 are wound around the yoke part 2C of the same magnetic path, due to the armature reaction as the load increases,
The magnetic resistance of the yoke portion 2C appears to increase. Therefore, since the magnetic flux density of the yoke 2C decreases, the electromotive force induced in the exciter winding 4 decreases, and as shown by the broken line (A) in FIG. 7, the load on the main winding 3 decreases. 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.

The present invention aims to solve the above-mentioned drawbacks,
The stator core is formed into a closed type (outer iron type), and a convex magnetic pole part is formed inside the closed type stator core, and a slot is provided in the center of the magnetic pole part. The object of the present invention is to provide a generator that generates induced electromotive force having a different phase in the main winding of the armature winding or the exciter winding by winding the main winding of the armature winding or the exciter winding in the slot.

(Another Means to Solve the Problems) Therefore, the generator of the present invention includes a rotor that generates a field, a main winding of an armature concentrated winding type that generates an electromotive force by interlinking with the magnetic field of the rotor, and The stator includes an exciter winding and a stator around which the main winding and the exciter winding are wound. and a slot in which one of the windings is wound is provided in the center of each magnetic pole part, so that electromotive forces of different phases are generated in the main winding and the exciter winding. It is characterized by This will be explained below with reference to the drawings.

(Example) Figure 1 is a Δ cross-sectional view of an example of a generator according to the present invention, Figure 2 is a front view of the stator core, and Figures 3 (A) to E) are An explanatory diagram of winding connections.

Figure 4 is a vector illustration, Figure 5 is a diagram explaining the generated electric current r''E, Figure 6 is a magnetic flux diagram explaining how the magnetic flux flows in a brushless generator, and Figure 7 is a brushless generator. shows the load characteristic curve of

In FIG. 1, reference numeral 11 is a stator.

The stator 11 has a stator core 1 shown in FIG.
2 are laminated. The stator core 12 is
As shown in Figure 2, there is a convex m facing inside the square core.
j'ml 2 a, 12 b and 12C112d are formed, [fields 12a and 12b and magnets 112c and 12d
slots 13a, 13 into which the windings are inserted.
b is written. Using the slot 13a, the 11th
As shown in V1'71 (the magnetic pole 12a has a first winding W1.
is wound around the magnetic pole 12b, and a first winding W is wound around the magnetic pole 12b. Similarly, using the slot 13b, the magnetic pole 12
A first winding &1W-3 is wound around the magnetic pole c, and a first winding Waa is wound around the magnetic pole 12d. and the first winding W1. .

A second winding w+, + is wound around the outer periphery of W, and a second winding Wb□ is wound around the outer periphery of the first winding W, . Field winding "ffA15" is located at the center of the stator 11.
A rotor 14 wound with is rotatably provided.

The first windings V/al to Wa4 and the second windings Wb+, Wb□ are wound in advance on a rectangular bobbin 9. For example, the first windings W-, W, □ are Magnetic pole 12a, 1
2b, the second winding W, 1 is inserted into the first winding W,
,, W, insert it into the outer periphery of □ and assemble it. The other second winding Wb□ is assembled in exactly the same manner.

Now, the first windings Wa+ to W14. Second winding Wbl
.

If wbz are connected so that the current flows in the direction shown in Figure 1, the voltage generated across the first winding W3 and the voltage Wb generated across the second winding W5 are As is clear from FIG. 4, the phase difference between the two windings is expressed by the connections of the first winding shown in FIG. 3(A). (or QJs = 'QJ*z
+W114) Senb = Wb+Jyusen.

With respect to W, Wl has a phase difference of 906.

However, in the above W al+ V/air W*3+
4 is the vector of the voltage generated in the first winding W□ to Wl4, and *b+, W, z is the vector of the voltage generated in the second winding Wb+, Wbz.

That is, as shown in FIG. 5, the second winding W.

, the voltage generated in the first winding W1 lags by 90',
A phase difference of 90'' occurs between the first winding vAw and the second winding W.

As described above, there are the wiring methods shown in FIGS. 3(B) to 3(E) as a method of wiring in which a phase difference of 90° is produced between the first winding and the second winding. In any of these cases, the first windings W□ to W, 4. Second winding Wb1.
Wires are connected to Wb□ so that current flows in the direction shown in FIG.

Next, between the first winding W1 and the second winding Wb, 9
In a two-winding generator that provides a phase difference of 0'', for example, the first winding W1 is an exciter winding, and the second winding W1 is an exciter winding.
When , is the main winding.

By connecting a phase advance capacitor to both ends of the first winding W, a phase advance current having the same phase as that of the second winding W5 can be passed through the first winding W. Therefore, the second winding Wb
+ That is, load compensation can be performed in accordance with an increase in the load current flowing through the main winding. That is, the rotor 14
Both ends of the field winding vA15 wound around the armature are short-circuited with a diode, and the counter electromotive force of the armature reaction is utilized. It can be a generator with a brushless structure called the so-called Nonaka type.

FIG. 6 shows a magnetic flux explanatory diagram explaining how the magnetic flux flows in the brushless generator, and the symbols 11 to 14. W□
No way lol, 4. Wbll Wb2 corresponds to that in FIG. Reference numeral 16 is a diode, which is connected to the field winding 1.
Connected to both ends of 5.

When a load current flows through the second winding Wb, that is, the main winding, magnetic flux in the direction of the solid arrow shown in FIG. 6 due to armature reaction increases as the load current increases. On the other hand, in the first winding '4fAw, ie, 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 that increases the magnetic flux generated by the field winding 15 of the rotor 14. Therefore, the seventh
The output voltage of the main winding is kept constant for the load current in the section shown in the figure.

In addition, with respect to overload current, although the magnetic resistance of the magnetic path around which the main winding, that is, the second winding Wb is wound, appears to be larger, the above-mentioned exciter winding, that is, the The magnetic flux caused by the phase-advanced current flowing through each of the windings W1 and 1 becomes effective, generates an electromotive force in the field winding 15, and prevents a decrease in the magnetic field, so that the load characteristic changes from the conventional winding characteristic type to that shown in FIG. The drooping characteristic is a solid line as shown in . Therefore, the short circuit current (3) 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 1, that is, the first winding Wa, is less affected by the output voltage waveform, so it can be tuned to the third harmonic, and the capacitor's capacitance can be done with a relatively small capacity.

In the above, the first winding Wa is an exciter winding.

Although the case where the second winding Wb is the main winding has been described, the same applies to the reverse case as well.

Further, although the stator core 12 is illustrated as a square core, it can also be a two-circular core.

(Effects of the Invention) As explained above, according to the present invention, it is possible to generate voltages with one phase different from each other in the armature concentrated winding type, and use this voltage to generate output with a large short circuit current and within a constant load current. A brushless generator whose voltage is kept constant can be realized.

Since the short-circuit current is large, it can be used as a power source for a motor that is required to start under a heavy load. Furthermore, since the stator core has no open end and is integrally formed, a gap between the rotors is always ensured, and rotor contact does not occur.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of one embodiment of the generator according to the present invention, Fig. 2 is a front view of the stator core, and Fig. 3 (A) to E) is an explanatory diagram of the connection of the first winding. . Figure 4 is a diagram explaining vectors, Figure 5 is a diagram explaining generated voltage waveforms, Figure 6 is a diagram explaining magnetic flux explaining how magnetic flux flows in a brushless generator, and Figure 7 is a load characteristic curve of a brushless generator. , FIG. 8 shows a longitudinal sectional view of a starter using a conventional U-shaped stator core. In the figure, 1 is the rotor, 2 is the stator, 3 is the main winding, 4
is the exciter winding, 11 is the stator, and 12 is the stator winding.
Core, 12a, 12b, 12c. 12d is a magnetic pole, 13a and 13b are slots, 14 is a rotor, 15 is a field winding, and 16 is a diode. W ml+ w, t, Wa3+ W! 14 represents the first winding, and Wbl and wb□ represent the second winding. Patent applicant Sawafuji Electric Co., Ltd. Agent Patent attorney Mori 1) Hiroshi (2 others) Ki 1 Tsuyoku 2 Calm 3 m

Claims (1)

[Claims] A rotor that generates a magnetic field, a main winding and an exciter winding of an armature concentrated winding type that generate an electromotive force by interlinking with the rotor's magnetic field, and a stator around which these main windings and exciter windings are wound. The stator is formed into an outer iron type, and includes a pair of magnetic pole parts formed in a convex shape inside the stator, and one of the windings is disposed in the center of each magnetic pole part. 1. A generator characterized in that a slot is provided in which the winding is wound, and electromotive forces of different phases are generated in the main winding and the exciter winding.