JPH0379940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Field of Application The present invention is a rotating electrical machine, particularly a rotating electrical machine such as a generator, in which a rotor structure that actively utilizes armature reaction is adopted to provide a brushless motor. This relates to a rotating electric machine with a structure.

(B) Prior art and problems to be solved by the invention Conventionally, in rotating electric machines such as generators, there have been few examples of actively utilizing the magnetic flux generated by armature reaction, and the occurrence of the armature reaction has been limited. Since this causes undesirable distortion in the output waveform and local saturation of the magnetic path, it has been desired to avoid the armature reaction. However, a so-called Nonaka-type generator as shown in FIGS. 5 and 6 is known as one example in which the magnetic flux generated by the armature reaction is effectively utilized.

In the figure, 1 is an armature winding wound on the stator, 2 is an exciter winding wound on the stator at a position at an electrical angle of 90° with respect to the armature winding 1, 3 represents a capacitor for supplying advanced phase current connected to the exciter winding 2, 4 represents a field winding wound on the rotor, and 5 represents a diode connected to the field winding 4. . Also, 6 is a stator, 7
represents the rotor.

In the case of the Nonaka type generator shown in FIG. 5, for example, when current initially flows through the field winding 4 for some reason, it is rectified by the diode 5,
A magnetic pole is generated. For this reason, an alternating voltage is induced in the armature winding 1 and the exciter winding 2. At this time, a phase-advanced current flows through the capacitor 3 due to the voltage induced in the exciter winding 2, and a voltage is applied to the field winding 4 due to the magnetic flux (Φ ₂ in Fig. 6) created by the phase-advanced current. is induced, a current rectified by the diode 5 flows through the field winding 4, and operates to increase the voltage induced in the armature winding 1 and the exciter winding 2.

FIG. 6 is an explanatory diagram showing the state of magnetic flux generation in this case, in which the armature winding 1 and the exciter winding 2 are wound on the stator 6 as shown, and the rotor 7 is wound with the armature winding 1 and the exciter winding 2 as shown in the figure. A field winding 4 (not shown) is wound thereon.

Assume that the rotor 7 is driven to rotate counterclockwise, for example, as indicated by the arrow in the figure, and that there are magnetic poles as indicated by N in the figure. In this case, a voltage is induced in the armature winding 1 and the exciter winding 2, and the indicated magnetic fluxes Φ ₁ and Φ ₁ ' are generated by the load current flowing in the armature winding 1. In addition, the illustrated magnetic fluxes Φ ₂ and Φ ₂ ' are generated by the phase advancing current flowing through the exciter winding 2.

The illustrated magnetic flux Φ ₃ represents the composite magnetic flux of the above-mentioned magnetic fluxes Φ ₁ and Φ ₂ , and the magnetic flux Φ ₃ ′ represents the composite magnetic flux of the magnetic fluxes Φ ₁ ′ and Φ ₂ ′.

In the case of the Nonaka type generator, the magnetic fluxes Φ ₂ and Φ ₂ ' created by the exciter winding 2 act to increase the indicated magnetic flux N, but the magnetic fluxes Φ ₃ and Φ ₃ ' generated by the armature winding 1 The magnetic flux created by the magnetic flux intersects the rotor 7 in such a way that the magnetic pole N increases. In other words, in the case of the Nonaka type generator, the magnetic flux created by the armature reaction is actively utilized as described above.
For example, it has the characteristic of keeping the output voltage constant without the need for a voltage regulator.

(C) Means for Solving the Problems The present invention provides a rotating electrical machine that further advances the mode of actively utilizing the magnetic flux created by the armature reaction as described above. Therefore, the rotating electrical machine of the present invention includes an armature coil wound around a stator, a rotor that is rotatably supported opposite the stator through a minute magnetic gap, and a rotor that is rotatably supported on the rotor. In a rotating electric machine having a field coil that generates magnetic poles, the shape of the rotor is configured asymmetrically with respect to a radial line segment extending from the central axis of rotation of the rotor toward the magnetic poles, and The magnetic resistance of the leading half of the rotor in the rotational direction toward the stator is configured to be larger than the magnetic resistance of the trailing half of the rotor toward the stator, and is generated by the current flowing through the armature coil. The magnetic flux generated by the field coil increases the magnetic flux generated by the field coil. This will be explained below with reference to the drawings.

(D) Embodiment Figures 1 and 2 show an embodiment of the rotating electrical machine of the present invention, Figure 3 shows an embodiment applied to a circular rotor, and Figures 4A and B show a concentrated armature winding type. An example in which the present invention is applied to a generator will be shown.

In FIG. 1 and FIG. 2, symbols 1, 4,
5, 6, and 7 correspond to FIGS. 5 and 6, respectively,
Reference numeral 8 represents a phase-advanced current supply capacitor connected to the armature winding 1, 9 represents a load, and Φ ₄ and Φ ₅ represent magnetic fluxes, respectively. Further, 10 and 10' respectively represent slits formed in the present invention.

Although the field winding 4 is omitted in the illustration in FIG. 2, as clearly shown in FIG. When considered hypothetically, it has an asymmetric structure on the left and right sides of the radial segment. That is, when the rotor 7 rotates counterclockwise as indicated by the arrow in the figure, in the case of the embodiment shown in FIG. 2, the slit 10 is provided on the leading side in the rotation direction (left side in the figure). That is, in the case shown in FIG. 2, the magnetic flux created by the current flowing through the armature winding 1 crosses the rotor 7 as indicated magnetic flux _Φ4 , and the indicated magnetic flux _Φ5 is blocked by the slit 10. The slits 10, 10' are thus formed.

For this reason, the magnetic flux created by the current flowing through the armature winding 1 acts in a direction that strengthens the magnetic pole N of the rotor 7. In other words, the magnetic flux generated by the armature reaction is actively utilized.

When considered in conjunction with FIG. 1, it may be considered that the operation is as follows. That is, for example, if a magnetic pole N is first generated on the rotor 7 for some reason, a voltage is induced in the armature winding 1 due to this. A current is supplied to the load 9 by the induced voltage, and a phase-advanced current also flows into the capacitor 8. The current flowing through the armature winding 1 is configured so that a phase-advanced current flows as a whole, and the magnetic flux Φ ₄ shown in the second diagram is created by the phase-advanced current. A voltage is induced in the field winding 4 by the magnetic flux Φ ₄ , which is rectified by the diode 5, and the magnetic pole N
Works to strengthen.

In the case of the configuration shown in Figure 1, Figures 5 and 6
Compared to the illustrated configuration, it is no longer necessary to provide the exciter winding 2 separately.

The case shown in Fig. 3 shows an example using a circular rotor, but the field winding 4 is only embedded in the slot on the rotor, and the case shown in Fig. 2 shows an example using a circular rotor. Similarly, the slits 10, 10' block the magnetic flux Φ ₅ shown in FIG.

Figures 4A and 4B show the case of a concentrated armature winding type generator. Codes 1, 6, 7, 10 in the figure,
10', Φ ₄ and Φ ₅ correspond to FIG. 2, respectively. FIG. 4B shows the rotor 7 of FIG. 4A in a position rotated by 180°. Even in the illustrated embodiment, the magnetic flux Φ ₅ is blocked and the magnetic flux Φ ₄ acts to strengthen the magnetic pole N (or S).

In the above description, the slits 10, 1
By providing 0', the magnetic resistance is made asymmetrical, and the mechanical strength of the rotor is not impaired. However, the means for making the magnetic resistance asymmetric is not limited to the above, and for example, a configuration such as a shape in which the leading end of the magnetic pole tip in the rotation direction of the magnetic pole of the rotor 7 shown in FIG. 2 is shaved off is adopted. You can also.

(E) Effects of the Invention As explained above, according to the present invention, it is possible to provide a rotating electrical machine with a brushless structure that effectively utilizes the magnetic flux created by the armature current.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the rotating electric machine of the present invention, Figure 3 shows an embodiment applied to a circular rotor, and Figures 4A and B show an example applied to a concentrated armature winding type generator. An example is shown below. Also, Figures 5 and 6
The figure shows a conventional generator. In the figure, 1 is an armature winding, 4 is a field winding, 5 is a diode, 6 is a stator, 7 is a rotor, 8 is a capacitor, 9 is a load, and 10 and 10' are slits, respectively.

Claims (1)

[Claims] 1. A rotor is provided with an armature coil wound around a stator, and is rotatably supported opposite the stator through a minute magnetic gap; and a field coil that generates magnetic poles on the rotor. In the rotating electric machine, the shape of the rotor is configured asymmetrically with respect to a radial line segment extending from the central axis of rotation of the rotor toward the magnetic poles, and the radial line extends from the leading half of the rotor in the rotational direction. The magnetic resistance to the stator is larger than the magnetic resistance to the stator in the rear half of the rotation direction, and the magnetic flux generated by the current flowing through the armature coil is directed to the field coil. A rotating electrical machine characterized by increasing the magnetic flux generated.