JPS61293141A - Voltage compensation circuit for synchronous brushless multiphase generator of inductor type - Google Patents

Abstract

PURPOSE:To compensate the reduction of output voltage and improve the regulation of the output voltage, by providing slots arranged on a stator core, with series windings, and by providing slots arranged at the specified positions of the polar arc sections of a rotating field core, with voltage compensating windings. CONSTITUTION:At the specified positions of a field core 1, slots 2 are arranged and wound up with compensating windings 3, and direct current obtained by rectifying a generated electromotive force with a commutator (not shown) is applied to field windings 4. A stator core 6 is provided with slots 7, and the slots 7 are wound up with main armature windings 8, and the slots 7a, 7b (The slots for one phase are shown in figure.) at specified positions are arranged at 120 deg. intervals and are wound up with series windings 9 which are connected to the main armature windings 8 in series with load. A generator is started under no-load, and load is connected to output terminals, and magnetic flux in proportion with load current flowing through the series windings 9 is generated, and the magnetic flux is cut off by the compensating windings 3, and a speed electromotive force is generated. The electromotive force is rectified and is fed to the field windings 4, and the reduction of output voltage is compensated. As a result, the regulation of output voltage can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a voltage compensation circuit for an inductor type brushless multiphase synchronous generator.

(Prior Art) Conventionally, most of the devices of this type have been a method using a current transformer and an actor, or a method using an automatic voltage regulator.

(Problems to be Solved by the Invention) However, the above-mentioned conventional system uses a current transformer actuator or an automatic voltage regulator in addition to the synchronous generator main body, and therefore has the disadvantage of high cost. The object of the present invention is to provide a voltage compensation circuit for an inductor type brushless multiphase synchronous generator that solves this problem.

(Means for Solving the Problems and Their Effects) The present invention provides a series winding in a slot for armature winding provided in a stator core in a multi-phase, for example, three-phase synchronous generator. The winding and the armature winding are connected in series and connected to the load, and a compensation winding is created by providing a slot at a predetermined position on the field magnetic pole surface with a pinch corresponding to the small magnetic pole formed by applying the series winding. The electromotive force induced in the winding is connected to the field winding through a rectifier to compensate for the voltage drop based on the load current.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows a front view of the field core including the compensation winding and field winding, and the second
The figure is a front view of the iron core of an inductor type brushless synchronous generator. As shown in FIG. 1, the field core 1 has a compensation winding slot 2 formed therein, and a compensation winding 3 is wound around the slot as shown in FIG. 4 is a field winding, and 5 is a rotor shaft. As shown in FIG. 2, the stator core 6 has armature winding slots 7 formed therein, and armature windings 8 are wound around the slots 7, and slots 7-a and 7 at predetermined positions are formed in the stator core 6. -b is provided with a series winding 9. Figure 2 shows only one phase, and in the case of three phases, the electrical angle is 1
They are spaced at 20 degree intervals.

This series winding 9 is connected to the main armature winding 8 as shown in FIG.
The compensation winding 3 is connected in series with the load, and the output of the compensation winding 3 is connected to the field winding 4 via a rectifier 10. The series winding 9, the compensation winding 3 and the rectifier 10 form a voltage compensation circuit 11. The rectifier 10 is fixed to the field core 1, and is attached to the rotor 1 along with the field winding 4 and the compensation winding 3.
form 3. Incidentally, the output of the l1iIII magnetic winding 12 is also connected to the field winding 4 via the rectifier 10', and is housed in the -1- rotor.

However, the compensation winding slot 2 formed in the field core 1
is located at the slot 2 in the distribution state of the series winding 9.
The position should be selected where the output voltage compensation of the main armature winding 8 is most effective by the compensation winding 3 housed in the main armature winding 8.

In order for the compensation winding 3 to generate power most efficiently, the reaction magnetic flux of the main armature winding 8 must be directed to the side where the iron core of the field pole face is demagnetized,
In other words, if the rotation direction of the rotor is counterclockwise, it is better to wind the compensation winding 3 so that the compensation winding slot 2 is located on the A-C, F-H side in FIG. Good power generation efficiency. This is thought to be because the field pole face on the side to be magnetized is saturated, and the generation of magnetic flux by the series winding 9 is weak.

On the other hand, the relationship between the series winding and the compensation winding is such that slots for the compensation winding are provided at predetermined positions on the magnetic field pole face at a pitch corresponding to one small box formed by the series winding, and the compensation winding is applied. By connecting the electromotive force induced in the winding to the field winding through a rectifier, it is possible to best compensate for the voltage drop due to the load current.

Next, the operation will be explained.

First, when the generator is operated with no load and then a three-phase load is connected to the output terminal, as shown in FIG. A load current flows through 9, and a magnetic flux proportional to the load current is generated. A compensation winding 3 wound around the field pole face cuts this magnetic flux to generate a speed electromotive force.

The compensation winding 3 supplies the speed electromotive force to the field winding 4 via the rectifier 10 to compensate for the drop in output voltage. Next, the above experimental data is shown below.

Figure 4 shows each winding of the inductor type brushless multiphase synchronous generator used in the experiment, A and B.

C...HTJ is a symbol indicating the position of the slot that accommodates the compensation winding 3, a and b indicate the position of the series winding 9,
8 indicates the position of only the armature winding phase.

Table 1 summarizes the experimental data and shows that the compensation winding 3 is (A
-B, E-G) (A-C, F-H> (A-E, F-J
) (C-E, H-J), and the series winding 9 and the main armature winding 8 in the case of no load and in the case of rated load.
The induced voltage values of the compensation winding 3 obtained through experiments are shown when the phase difference between the two positions is 0 degrees and 90 degrees.

Table 1 ± End 1"I-' Figure 5 is a graph of the experimental results shown in Table 1. According to the above experimental data, the winding position of the main armature winding 8 is The winding 9 is (a-b).In other words, it is better to make the direction of the reaction magnetic flux of the main armature winding and the magnetic flux of the series winding 9 in the same phase than to make the direction of the compensation winding 9 90 degrees out of phase. The amount of power generated is the largest when the winding position of the compensation winding 9 is (A-, C, j-,)T).This is shown in Fig. 5. Curve (El)
It is clear from looking at.

Note that the curves (A), (II), and (C) shown in FIG.
, (d).

(*), (f), 0), and (f) are voltage values indicated by the same symbols listed in Table 1, which are expressed as curves.

Although this embodiment has been described with reference to a rotating field type generator, the same applies to a rotating armature type generator, and is not limited to an inductor type brushless three-phase synchronous generator, but also a multi-phase AC synchronous generator.

(Effects of the Invention) As explained below, the present invention can compensate for a drop in output voltage by simply providing slots on the field poles and pole faces and applying voltage compensation windings to the slots. Furthermore, since neither a current transformer nor an automatic voltage regulator is used, the cost is low and the output voltage fluctuation rate is good.

[Brief explanation of drawings]

Fig. 1 of the embodiment is a front view of a field core including a compensation winding and a field winding, Fig. 2 is a front view of the iron core of a brushless synchronous generator, and Fig. 3 is a winding equivalent to one generator. Figure 4 is a diagram showing the relationship and connection between wires, Figure 4 is a diagram showing the mutual relationship positions of each winding of the inductor type brushless multiphase synchronous generator used in the experiments of the present invention, and Figure 5 is a diagram showing the mutual relationship of each winding of the inductor type brushless multiphase synchronous generator used in the experiments of the present invention. This is experimental data of the induced voltage value of the compensation winding when the arrangement position of the compensation winding is changed when the difference in arrangement position between the winding and the main armature winding is 1 and 90↓. 1... Field core 2... Compensation winding slot 3... Compensation winding 4... Field winding 6... Stator core 8... Main armature winding 9...・Series winding 10... Rectifier 11... Voltage compensation circuit 1
3... Rotor patent applicant Denyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 74

Claims (1)

[Claims] A slot is provided in the stator core, a series winding is applied to this slot, and a slot is also provided at a predetermined position in the pole arc portion of the rotating field core, and a voltage compensation winding is provided in this slot. This is a voltage compensation circuit for an inductor type brushless multiphase synchronous generator.