JPS61135398A - Brushless synchronous machine - Google Patents

Abstract

PURPOSE:To increase to regulate the output of an exciter by forming a sub exciter in a rotary field type with a field coil and exciting the sub exciter by part of the output of a rotary armature type exciter. CONSTITUTION:The armature 3a of an exciter 3, the field 22b of a sub exciter 11 wound with a field coil 11a, and a converter 12 for converting the output of the exciter 3 to a DC are provided on the same rotational shaft of a synchronous machine 4. A stationary unit has a converter 13 for converting the output of the exciter 11 into a DC to supply to the field coil 3b of the exciter 3 is provided. The output of the exciter 3 converted by the converter 12 into DC is supplied to the field coil 11a of the exciter 11, and the other is supplied to the field coil 4a of the machine 4. The converter 13 is regulated to obtain desired synchronous machine output.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a brushless synchronous machine in which the output of an exciter can be adjusted and increased.

[Prior art and its problems]

In general, in a brushless synchronous machine, as shown in Fig. 2, a rotating armature type AC exciter 3 is excited by a rotating field type AC auxiliary exciter 2 using an Iζ permanent magnet 1, and a slip ring is excited by this exciter 8. The rotating field type synchronous machine 4 was energized without being used. The output of the sub-exciter 2 is the permanent magnet 1
Since the magnetomotive force of is constant, the voltage decreases in inverse proportion to the increase in current as shown in FIG. - Since the internal resistance of the exciter 8 is constant, the input is increased (ζ must be increased in proportion to the current and voltage, so the drawback is that the output of the exciter 8 cannot be increased beyond a certain value) there were.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide a brushless synchronous machine in which the output of the exciter can be increased in an adjustable manner.

[Key points of the invention]

In order to achieve the above object, the present invention uses a rotating field type sub-exciter with a field coil, and uses a part of the output of the rotating armature type exciter which is converted to direct current by a DC converter to drive the sub-exciter to the sub-exciter. At the same time, the output of the exciter is increased by exciting the exciter with the output of the sub-exciter via a controllable DC converter.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 2 are denoted by the same reference numerals. In this figure, the field 11b of the auxiliary exciter 11 on which the armature 8a of the exciter 8 and the field coil tta are wound is coaxial with the rotating shaft of the synchronous machine 4.
and a conversion device 12 for converting the output of the exciter 8 into direct current, and a conversion bag [18 is provided in the fixed part for converting the output of the sub-exciter 11 into direct current and supplying it to the field coil 8b of the exciter 8. It is provided. A part of the output of the exciter 8 converted into DC by the converter 12 is sent to the field coil 1laj of the sub-exciter 11.
This is supplied, and the others are supplied to the field coil 4 of the synchronous machine 4. The converter 13 of the fixed part can control the output of the sub-exciter 11, and when the converter 18 is adjusted to increase the output of the sub-exciter 11, the input to the exciter 8 increases and the output increases. Therefore, if the converter 18 is appropriately adjusted to increase the input to the exciter 3, the input to the synchronous machine 4 and the sub-exciter 11 will also increase, increasing their respective outputs, thereby obtaining the desired synchronous machine output. Can be done.

〔Effect of the invention〕

According to this invention, in a brushless synchronous machine, the auxiliary exciter is a rotating field type with a field coil, and a part of the output of the rotating armature type exciter is converted into DC by a DC converter. At the same time, the output of the auxiliary exciter is used to excite the exciter via the controllable DC converter, thereby providing the effect that the output of the exciter can be adjusted to a greater extent.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an embodiment of the present invention, FIG. 2 is a schematic block diagram of a conventional example, and FIG. 8 is a characteristic curve diagram of the exciter and sub-exciter shown in FIG. 8... Exciter, 8a... Armature, 4... Synchronous machine,
11... Sub-exciter, tta... Field coil, llb
...Field, 12.18...Conversion device. Figure 1 Figure 2 → Current Figure 3

Claims (1)

[Claims] 1) Equipped with a rotating armature type AC exciter and a rotating field type AC auxiliary exciter having a field coil, and exciting the auxiliary exciter with a part of the output of the exciter converted to DC by a DC converter, A brushless synchronous machine characterized in that an exciter is excited by the output of a sub-exciter via a controllable DC converter.