JPS5863057A - Brushless three-phase synchronous generator - Google Patents

Abstract

PURPOSE:To cancel trouble inducing an AC voltage on an exciting winding by a method wherein a stator is provided with a three-phase main winding and a DC exciting winding and the number of poles of one winding differs from the number of poles of the other winding. CONSTITUTION:An exciting current Ie is flowed to an exciting winding We from a DC power supply B and with a rotor R rotated in the exciting winding We at predetermined angular velocity omega, an AC voltage is induced at a field circuit Wf1 by a two-pole stationary magnetic field caused by the exciting winding We. This AC voltage is rectified by diodes Df1 and Df2 to produce an exciting current if1 and four-pole field pole is generated. The abovementioned exciting currents if1, if2 remarkably fluctuate. However, the interlinkage magnetic fluxes of field circuits Wf1, Wf2 are contantly held in appearance as the inductance of the field winding is high. Therefore, the rotor can stably obtain the field poles which are the same pole as those of a main winding W.

Description

[Detailed Description of the Invention] Jin's invention excites a field winding provided with a rotor by an excitation winding provided in a stator of a generator, and generates an alternating current in the field winding. This invention relates to a brushless three-phase alternating current generator in which excitation power is rectified by a diode.

The brushless single-phase generator, which obtains excitation power by rectifying the alternating current induced in the field winding with a diode, is explosion-proof.
It is already in practical use because it is highly durable and easy to maintain and inspect. By the way, attempts have been made to apply this to three-phase alternating current generators (for example, published in June 1970,
Kyushu University Engineering Bulletin Vol. 44 No. 3 No. 357-3641
Since the excitation winding is of the same polarity as the main winding, the AC waveform induced in the excitation winding is highly distorted, resulting in unbalanced three-phase voltages. It was common.

This invention was made to eliminate the problem of tilting.
The main feature is that the DC excitation winding provided on the stator has a different number of poles than the main winding, and a plurality of field windings are provided so that the magnetic poles generated on the rotor are the same as the main winding.

The present invention will be explained below with reference to illustrated embodiments.

Figure 1 shows a four-pole three-phase generator. A four-pole, three-phase main winding W and a two-pole, single-phase excitation winding W are wound around the stator S. 11, bl, .1 and 2゜b2, c2 are output terminals of the main winding W, respectively.

The excitation winding W. is connected to a DC power source BK via an externally adjustable current regulator (2). On the other hand, the rotor R has four salient poles, each of which has a winding Wl.

wt, ws and W4 have been applied. Each winding is connected in series with two adjacent windings ws, ws and wi, Wa to form two-by-one field circuits Wf 1 , Wf M . These field circuits Wf t , Wf s Ic
diodes Dft and Dfx are inserted respectively, and a half-wave rectifier circuit is formed. Here, the windings Wr, W, W
The winding direction of the windings s and W4 and the diodes Dfl, D
The forward direction of fl is N, similar to the magnetic poles of the four salient poles and the main winding W.
5. It is set to be magnetized in an N,8 arrangement.

In this embodiment, the excitation winding we is excited by a DC power source B.
When the rotor R is rotated at a predetermined angular velocity ω while flowing the current Ie, the two-pole stationary magnetic field generated by the excitation winding We causes the field circuit Wft to have a frequency f as shown in FIG. An alternating current voltage of 6 ft of = ''/2π is induced. This alternating voltage is rectified by diodes 1)fl and Df, producing an excitation current iff shown by arrows in FIG. 1, and four field poles are generated.

Here, the excitation currents if and if vary greatly, but since the inductance of the field winding is large, the field circuits Wf l and Wf snow linkage flux φf1 decreases from the maximum value at a rate of (2) ωt. At this time, .fl shown in FIG. 3 is generated and conduction occurs between Dfl and Df, and the upper magnetic flux φf1 is apparently kept substantially constant. Similarly, the phase of φft is delayed by 180° and the same phenomenon occurs. Therefore, field poles N, S, N, S having the same polarity as the main winding W can be stably obtained in the rotor.

FIG. 2 shows another embodiment in which the present invention is applied to a Vt two-pole three-phase generator TM. That is, the stator SK has a two-pole three-phase main winding WO and a four-pole single-phase excitation winding WS, and the rotor R has four windings Wl, W! , W3, and w4 and the connection of the diodes DI and D2, the four salient poles are magnetized in the order of N, N, S, and S, similar to the magnetic poles of the main winding.

In the generator of this embodiment, when the excitation winding W is supplied with power from the power source B and the rotor R is rotated, the windings Wl to W4 cross the static magnetic field of the four poles, so as shown in FIG. As shown, f-2 (d7.
AC voltage ef! induce. This alternating current voltage is rectified by diodes Ds and DgK, generating an excitation current trt shown by the arrow in FIG. Similarly, two field poles are produced.

As described above, in this invention, the stator is provided with a three-phase main winding and a DC excitation winding, and the number of poles of one winding is different from the number of poles of the other winding. Since there is no magnetic interaction between the wire and the main winding, problems caused by AC voltage induced in the excitation winding can be eliminated.

In addition, since one of the excitation winding and the main winding has an even number of poles compared to the other, a field circuit Wf 1 is formed by combining the field winding and the diode applied to the salient poles of the rotor. ．． Wf
t allows the magnetic pole arrangement of each salient pole to be magnetized to match the magnetic pole of the main winding.

Therefore, there is an effect that a balanced three-phase voltage that approximates a sine wave can be obtained by the main winding. Moreover, since the main winding does not vibrate the waveform shaping accelerator circuit, there is no drop in power factor, and since the excitation winding does not require an AC voltage induction prevention circuit, the device does not become bulky. The effect is also significant.

Although the embodiments show two-pole and four-pole generators, it goes without saying that the present invention can also be applied to generators with six or more magnetic poles.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a circuit diagram showing the circuit configuration of a 4-pole, 3-phase generator, and Fig. 2 shows another embodiment, in which a 2-pole, 3-phase generator is used. The circuit diagram and FIG. 3 are their characteristic diagrams. W, Wo... Main winding, We... Excitation winding, Wf l, Wf! ...excitation circuit, D
f+. Df2...Diode, Sa Fist...Stator, R...Rotor, Special pestle Applicant: Saku Nonaka, Attorney: Masaki Yamakawa (and one other person) Purification of drawings (in the contents) (No change) Figure 1 Figure 3 (a) (b) Procedural amendment (large) 1, 'l ('I indication 1982 Patent Application No. 15q '7Z5-g-2, title of the invention) Existence 3 n r = = 11 Amehong Electric Power Attack 3, Relationship with the case of the person making the amendment Patent applicant (purchase of drawings (no change in content))

Claims (1)

[Claims] (11 The stator is provided with a three-phase main winding and a DC excitation winding,
The number of poles of one winding is an integral multiple of the number of poles of the other winding, and the rotor is provided with at least the same number of magnetic poles as the larger number of poles of the stator winding, and at least two sets of magnetic poles are provided on the rotor. A half-wave rectifier circuit is constructed by connecting a diode to each field winding, and the winding direction of the field winding and the forward direction of the diode are mainly connected to the field winding. A brushed three-phase synchronous generator that is set to produce the same magnetic poles as the windings. (2) A 4-pole, 3-phase main winding and a 2-pole, single-phase excitation winding are wound around the stator, and two sets of field windings are wound around the rotor, which has 4 magnetic poles. Pole N, 8. The brushless three-phase synchronous generator according to claim 1, configured to be magnetized in the order of N and 8 poles. (3) A two-pole three-phase main winding and a four-pole single-phase excitation winding are wound around the stator, two sets of field windings are wound around the rotor, which has four magnetic poles, and each Poles N, N, 8. The brushless three-phase synchronous generator according to claim 1, wherein the brushless three-phase synchronous generator is configured to magnetize the B pole INK.