JPH0642772B2 - Rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention employs a rotor or stator structure that positively utilizes armature reaction in a rotary electric machine, particularly a rotary electric machine such as a generator. The present invention relates to a rotating electric machine having a brushless structure.

(B) Problems to be Solved by Conventional Techniques and Inventions Conventionally, in rotating electric machines such as generators, there are few examples in which the magnetic flux generated by the armature reaction is positively utilized, and the occurrence of the armature reaction occurs. It has been desired to avoid the occurrence of the armature reaction because the output waveform causes undesired distortion and local magnetic path saturation occurs. However, as one of the examples in which the magnetic flux due to the armature reaction is effectively used, a so-called Nonaka type generator as shown in FIGS. 5 and 6 is known.

In the figure, 1 is an armature winding wound on the stator, 2 is an armature winding 9 with respect to the armature winding 1 on the stator.
An exciter winding wound at a position of 0 °, 3 is a capacitor for supplying a phase advancing current connected to the exciter winding 2,
Reference numeral 4 represents a field winding wound around the rotor, and 5 represents a diode connected to the field winding 4. Further, 6 is a stator and 7 is a rotor.

In the case of the Nonaka generator shown in FIG. 5, when a current flows through the field winding 4 by self-excitation of the circuit of the capacitor 3 connected to the exciter winding 2 due to the slight residual magnetism of the rotor 7, the diode 5 causes It is rectified and a magnetic pole is generated in the rotor 7. To this end, the armature winding 1 and the exciter winding 2
An alternating voltage is induced in and. At this time, a phase-advancing current flows through the capacitor 3 due to the voltage induced in the exciter winding 2, and the magnetic flux generated by the phase-advancing current (Φ _{2 in} FIG. 6).
A voltage is induced in the field winding 4 by the diode 5, and a current rectified by the diode 5 flows in the field winding 4 to increase the voltage induced in the armature winding 1 and the exciter winding 2. Operate.

FIG. 6 is an explanatory view 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 mounted on the rotor 7. A field winding 4 (not shown) is wound.

It is assumed that the rotor 7 is driven to rotate counterclockwise as indicated by an arrow in the figure, and that magnetic poles are present as indicated by N in the figure. In this case, armature winding 1 and exciter winding 2
A voltage is induced in and, and the illustrated magnetic fluxes Φ ₁ and Φ ₁ ′ are generated by the load current flowing in the armature winding 1. In addition, due to the above-mentioned phase-advancing current flowing through the exciter winding 2, the illustrated magnetic flux Φ ₂ ,
Φ ₂ ′ is generated.

The illustrated magnetic flux Φ ₃ represents the combined magnetic flux of the above magnetic fluxes Φ ₁ and Φ ₂ ,
The magnetic flux Φ ₃ ′ represents a combined magnetic flux of the magnetic fluxes Φ ₁ ′ and Φ ₂ ′.

In the case of the Nonaka generator, the magnetic fluxes Φ ₂ , Φ ₂ ′ created by the exciter winding 2 act to increase the magnetic pole N shown in the figure, but the combined magnetic flux Φ ₃ , combined with the above magnetic fluxes Φ ₁ , Φ ₁ ′,
Φ ₃ ′ intersects the rotor 7 so that the magnetic flux created by the armature winding 1 increases the magnetic pole N as shown.
That is, in the case of the Nonaka generator, the magnetic flux created by the armature reaction as described above is positively used,
For example, it has the characteristic of keeping the output voltage constant without a voltage regulator.

(C) Means for Solving the Problems The present invention provides a rotating electric machine that further develops the mode of positively utilizing the magnetic flux generated by the armature reaction as described above. Therefore, the rotating electric machine of the present invention includes a stator and a rotor that faces the stator and is rotatably instructed via a magnetic gap, and a field coil and a rotor are provided on the rotor. The field coil is provided with a diode provided so as to short-circuit the field coil, and the armature coil provided in the stator is provided with a capacitor (8) provided between both ends of the armature coil. In a brushless rotary electric machine that induces a voltage in the armature coil by the magnetic flux generated by, the rotor is wound around the leading half of the rotor in the direction of rotation and is independently provided for each magnetic pole. It is characterized by having a short-circuit coil. Hereinafter, description will be given with reference to the drawings.

(D) Embodiment FIG. 1 and FIG. 2 show an embodiment of a rotating electric machine of the present invention, FIG. 3 shows an embodiment applied to a circular rotor, and FIG. 4 (A).
(B) shows an embodiment applied to a concentrated armature winding type generator.

In FIGS. 1 and 2, reference numerals 1, 4, 5, 6, 7
Are corresponding to FIGS. 5 and 6, respectively, and 8 is an armature winding 1
Capacitor for phase-advancing current supply connected to, 9 is a load, Φ
₄ , Φ ₄ ′, Φ ₅ , and Φ ₅ ′ represent magnetic flux, respectively. Again 1
Reference numerals 0 and 10 'respectively represent short-circuit coils (shade coil) provided in the present invention.

Although the field winding 4 is omitted in the illustration of FIG. 2, as clearly shown in FIG. 2, the rotor 7 has a radial line extending from the center axis of rotation to the magnetic pole (at N in the figure). When a minute is considered virtually, it is made to have an asymmetric structure on the left and right sides of the radial line segment. That is, when the rotor 7 rotates counterclockwise as shown by the arrow in the drawing, in the case of the embodiment shown in FIG. 2, the short-circuit coils 10 are provided on the leading side (the left side in the drawing) of the rotation direction corresponding to each magnetic pole. To be That is, in the case shown in FIG. 2, the magnetic flux created by the current flowing through the armature winding 1 intersects the rotor 7 like the magnetic fluxes Φ ₄ and Φ ₄ ′ shown in the drawing, and the magnetic fluxes Φ ₅ and Φ ₅ ′ shown in the drawing are the above-mentioned short-circuit coils. The short-circuit coils 10, 10 'are formed so as to be blocked by 10.

For this reason, the magnetic flux generated by the current flowing through the armature winding 1 acts in the direction of strengthening the magnetic pole N of the rotor 7. That is, the magnetic flux generated by the armature reaction is positively utilized.

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

In the case of the configuration shown in FIG. 1, it is not always necessary to separately provide the exciter winding 2 as compared with the configurations shown in FIGS. 5 and 6.

In the case shown in FIG. 3, the circular rotor is used, but the field winding 4 is only embedded in the slot on the rotor. similarly to short-circuit coil 10, 10 'is the magnetic flux [Phi ₅ of Figure 2 shown, [Phi _5' that are identical to block.

4 (A) and (B) show the case of a concentrated armature winding type generator. Reference numerals 1, 6, 7, 10, 10 'in the figure,
Φ ₄ and Φ ₅ correspond to FIG. 2, respectively. FIG. 4 (B) shows a case where the rotor 7 of FIG. 4 (A) is in a position rotated by 180 °. Also in the case of 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).

(E) Effects of the Invention As described above, according to the present invention, it is possible to provide a rotating electric machine having a brushless structure in which the magnetic flux generated by the armature current is effectively used.

[Brief description of drawings]

1 and 2 show one embodiment of the rotating electric machine of the present invention, FIG. 3 shows one embodiment applied to a circular rotor, and FIG. 4 (A).
(B) shows an embodiment applied to a concentrated armature winding type generator, and FIGS. 5 and 6 show 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 short-circuit coils respectively.

Claims (1)

[Claims] 1. A stator and a rotor which is opposed to the stator and is rotatably instructed through a magnetic gap, and the field coil and the field coil are short-circuited on the rotor. The diode provided as described above, and for the armature coil provided for the stator, the capacitor (8) provided between both ends of the armature coil is provided, and the magnetic flux generated by the field coil is provided. In a brushless type rotating electric machine that induces a voltage in the armature coil by means of the above, the rotor is provided with a short-circuit coil wound around the leading half of the rotor in the direction of rotation and independently provided for each magnetic pole. A rotating electric machine characterized by the above.