JPH07322542A - Damper winding for synchronous generator - Google Patents

Abstract

PURPOSE:To obtain a synchronous generator in which the efficiency can be enhanced while suppressing temperature rise. CONSTITUTION:A core 2 is provided with a plurality of slots 4 for damper winding between adjacent slots 3 for field winding in a cylindrical rotor 1. A damper winding 5 is set in each slot 4 for damper winding and above a field winding 6 in the slot for field winding. The damper windings of adjacent poles located at an electromagnetically identical position are interconnected in reverse direction and arranged as a balanced polyphase winding thus absorbing the reverse phase current caused by armature reaction drastically.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a damper winding of a synchronous generator.

[0002]

2. Description of the Related Art Conventionally, in a synchronous generator, especially in a single-phase generator, in order to reduce the distortion of the voltage waveform, the generator shown in FIGS.
As shown in, a plurality of circular damper bar slots 34 are provided in the iron core 33 between the adjacent field winding slots 32 in the cylindrical rotor 31, and each damper bar slot 34 is provided with a copper or brass rod ( Bar 35 and insert the end of each bar 35 protruding from the end of the iron core 33 into the short-circuit ring 3
The damper winding short-circuited in 6 is applied (Actual development Sho 56
-136464). In the figure, 37 is a field winding.

[0003]

However, in a conventional synchronous generator equipped with a damper winding, particularly a single-phase generator, it is impossible to form a balanced polyphase winding, so that harmonics disappear. It's extremely difficult. That is, in a single-phase generator, the armature reaction produced by the armature current is an alternating magnetic field that does not create a rotating magnetic field unlike the multi-phase generator, but changes only its amplitude at a spatially fixed position. This alternating magnetic field is divided into a positive-phase component that rotates in the same direction as the field and a negative-phase component that rotates in the opposite direction. Due to the occurrence of the opposite-phase component, harmonics are generated in both the armature winding and the field winding. This is because it occurs. Therefore, the efficiency is lowered and the temperature is increased due to the harmonics. Therefore, an object of the present invention is to provide a synchronous generator capable of reducing temperature rise and improving efficiency.

[0004]

In order to solve the above-mentioned problems, a damper winding of a synchronous generator of the present invention comprises a plurality of damper windings on an iron core between adjacent field winding slots in a cylindrical rotor. Slots are provided, the damper windings are housed above the field windings in each damper winding slot and field winding slot, and the damper windings of adjacent poles at the same electrical position are reversed from each other. It is characterized by connecting in the direction. It is preferable that the damper winding slots cooperate with the field winding slots to be arranged substantially at a pole pitch.

[0005]

In the damper winding of the synchronous generator of the present invention, the damper winding has a balanced multi-phase winding arrangement, and the reverse phase current due to the influence of armature reaction can be dramatically absorbed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front sectional view and a side sectional view showing an embodiment of a damper winding of a synchronous generator of the present invention. In the drawing, reference numeral 1 denotes a cylindrical rotor in a single-phase generator, and a semi-open field winding slot 3 is provided on the outer peripheral portion of an iron core 2 of the cylindrical rotor 1 at appropriate intervals in the circumferential direction. In addition, the plurality of half-open damper slots 4 are provided between the adjacent field winding slots 3 so as to cooperate with the field winding slots 3 so that the damper winding slots 4 are arranged close to the pole pitch. Has been. The damper winding 5 is housed in each of the damper winding slots 4 and is also located in the field winding slot 3 above the field winding 6 (outer peripheral side). Then, the damper winding 5 is stored. The damper windings 5 are such that adjacent poles located at the same electrical position are connected in opposite directions.

In the damper winding of the single-phase generator having the above-mentioned structure, the damper winding 5 is a multi-phase winding evenly arranged around the entire circumference of the cylindrical rotor 1, and a reverse phase due to the influence of the armature reaction occurs. It is possible to dramatically absorb the current.

In the above embodiment, the single-phase generator is described, but the present invention is not limited to this, and it can be applied to a multi-phase generator. It is especially effective for large ones.

[0009]

As described above, according to the synchronous generator of the present invention, the damper winding has a multi-phase winding arrangement, and the reverse phase current due to the influence of the armature reaction can be dramatically absorbed. The generator efficiency can be remarkably improved as compared with the conventional one, the temperature rise can be significantly reduced, and the generator can be downsized. Further, since the distortion of the waveform due to the third harmonic is also improved, the output voltage waveform can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a damper winding of a synchronous generator of the present invention.

FIG. 2 is a side sectional view of the damper winding of FIG.

FIG. 3 is a front sectional view of a damper winding of a conventional synchronous generator.

4 is a side sectional view of the damper winding of FIG.

[Explanation of symbols]

 1 Cylindrical rotor 2 Iron core 3 Slot for field winding 4 Slot for damper winding 5 Damper winding 6 Field winding

Claims (2)

[Claims] 1. A plurality of damper winding slots are provided in an iron core between adjacent field winding slots in a cylindrical rotor, and each damper winding slot and the field winding in the field winding slot. A damper winding for a synchronous generator, characterized in that a damper winding is housed above the wire, and the damper windings of adjacent poles that are electrically located at the same position are connected in opposite directions. 2. The damper for a synchronous generator according to claim 1, wherein each of the damper winding slots is arranged to be substantially close to a pole pitch in cooperation with a field winding slot. Winding.