JPS6077655A - Pole change type generator - Google Patents

Abstract

PURPOSE:To obtain a pole change generator capable of varying the number of field poles by forming double winding or exchange of coupling of field windings of an AC generator. CONSTITUTION:A 4-pole winding 1 is provided inside a cylindrical field winding, and 8-pole winding 2 is formed at the outside. When the exciter has a 4-pole field, power rectified to DC excites a rotary field 4-pole side by a rectifier for generating via 4-pole armature winding, and a 4-pole generator is provided. When a load becomes light, the decrease in the load current is detected to set the rotating speed of an engine to a low value, the exciter is set to 8-pole field and 4-pole field is eliminated. Thus, the power is generated at 8-pole winding to form 8-pole rotary field, thereby providing a 8-pole generator. When the load increases, the exciting circuit is switched to 4-pole field, thereby providing a 4-pole generator.

Description

Detailed Description of the Invention This invention uses diesel generators used at construction sites, etc., to automatically switch the number of generator poles between 11 poles and 8 poles depending on the size of the load, and at the same time reduce the engine rotational speed. is high speed (111100RPM) or low speed (90ORP
Even if it changes to M), the frequency is always constant (601-12)
A ball change type generator that can generate

With conventional diesel generators, regardless of the load size,
In Kansai, it runs at 60 ru (1800 RPM). Diesel generators are used at construction sites to power pile drivers (vibrohammers), excavators (earth augers), etc., but due to the work process, there are times when one area of work has been completed and the next work begins. Until then, even when large-capacity electricity is not required, a generator with 4 field poles will have a rotation speed of 180OR.
PM・60) h, and the rotation speed and frequency are linked, so if you operate at a low rotation speed, the rated frequency (601
-1x), and the engine speed must be kept at high speed (IgooRPM) even under light loads. Conventional alternating current generators waste fuel due to increased frictional horsepower due to high-speed engine rotation, but with ball change generators,
When the load is light, large engine horsepower is not required, and the
By setting the number of L machine field poles to 8, the engine speed is 9.
Since it can generate 60 liters of power at 0 ORPM, it is possible to reduce engine friction horsepower (mechanical loss), which reduces operating costs such as significant fuel savings, and at the same time reduces noise. .

The present invention will be explained according to the drawings.

The 11-pole winding (1) is made on the inside of the cylindrical field winding, and the 8-pole winding (2) is made on the outside. On the same axis, there are pushles, exciter, armature winding, 4-pole winding and GTJI overlapping winding. , II pole wire and 8 pole winding wire have different coil pitches, so they will not occur at the same time.

When the exciter is a 4-pole field, the rectifier that generates power only for the 1-pole N and root winding converts it into DC, and the power excites the 4-pole side of the rotating field, making it a 4-pole generator, which generates 60H at 1g00RPM.
When the load becomes light where z occurs, a decrease in load current is detected (known circuit) and the engine speed is reduced (gooBPM).
At the same time, the exciter is set to 8fM field, and at the same time, 1
By extinguishing the 1m field, electric power is generated in the 8-pole electric winding, and by creating the 8-pole side rotating field, it becomes an 8-pole generator, and the 9
Generates 60 liters of power at 00 RPM. When the load increases, the engine automatically turns off due to the increase in load current.

At the same time as setting the rotation speed to 1g00RPM, the excitation circuit is switched to the iI polar field, and it becomes an anode generator.

Figure 2 shows the alternator armature winding. For 4-pole power generation (3
) and 8-pole power generation (4) By using the winding (known) method, one generator can be used as a 4-pole or 8-pole generator. According to the present invention, the engine speed can be adjusted to 1g depending on the load size.
By changing the speed to 00RPM or 900RPM, power is generated at 9001PM during light loads, thereby saving wasted fuel. In the example, the generator output is 30
0KVA, engine horsepower 1100) P/IgOO only P
The M requires 22 liters of consumption per hour when no load is on, but the consumption when operating with a light load of 90 ORP is 6 liters, which is a 70% fuel saving compared to the conventional model, making it the perfect diesel for the energy-saving era. It's a generator.

If the ratio of medium load to light load is 2:1, 30% of wasted fuel can be saved.

[Brief explanation of the drawing]

The drawings show examples. Figure 1 shows rotating field lines (rogu)
, (1) is it pole field winding, (2) is 8 pole field winding, Figure 2 is armature winding (stator), (3) hull pole i
ii Child winding - phase part, (4) (8-pole armature winding - phase part Patent applicant Iwamoto - Fig. 1 No. 4

Claims (1)

[Claims] By doubling the field winding of the alternator or changing the wiring,
Poe/I/f engine type generator that can vary the number of field poles