JPH0345199A - Generating device driven by engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a power generation device driven by an engine, and more particularly to a power generation device equipped with a single-phase synchronous generator and a magnet generator.

(Prior Art) Conventionally, there is a power generation device driven by an engine as shown in FIG.

To explain this with a diagram, l is a gasoline engine,
A capacitor-compensated single-phase synchronous generator 2 is interlocked with the crankshaft of this engine 1. A power generation winding 3 of this single-phase synchronous generator 2 is connected to a load 5 via a power supply circuit 4. 6 is a switch.

The current flowing through the power supply circuit 4 causes the engine l
A rotational speed adjusting device is provided to control the rotational speed of the motor. This device has a current detection control section 8 that detects the current flowing through the power supply circuit 4, and 9 indicates the current detection control section 8.
This is a current transformer for

Further, an electromagnetic device 10 driven by the output signal of the current detection control section 8 is provided, and this electromagnetic device l.

is connected via a lever mechanism 11 to a speed governor 12 for engine l. The current detection control section 8 has a rectifying means therein, and power for controlling this section is supplied from a partial winding 13 of the power generation winding 3.

Then, when the engine l is operated to drive the single-phase synchronous generator f 2 and the switch 6 is closed, the power output from the single-phase synchronous generator 2 is transmitted to the load via the power supply circuit 4. 5.

When power is supplied from the single-phase synchronous generator 2 to the load 5 via the power supply circuit 4 as described above, the current detection control section 8 detects the current flowing through the power supply circuit 4. Then, according to the output signal, the electromagnetic device 10, the lever mechanism 11. The speed of the engine 1 is increased via the speed governor 12, and the speed of the single-phase synchronous generator 2 is increased by increasing the speed of the engine 1, so that sufficient electric power is output.

In the above case, as shown in FIG. 4, the single-phase synchronous generator 2 is driven at the rated rotation speed Nh' and outputs the rated voltage V'. Further, a 6 rated voltage V' is ensured for the power supply of the current detection control section 8.

By the way, as shown in FIG. 4, the single-phase synchronous generator 2 has a characteristic that the output voltage suddenly disappears when the rotational speed decreases below a predetermined critical rotational speed NO. If the output voltage disappears in this way, the load 5 will be generated after that, and the current will not start flowing into the power supply circuit 4. In other words, this current will remain zero, and the current will not start flowing. The detection control unit 8 does not automatically speed up the engine l.

For this reason, in the case of the above configuration, in the case where there is no load 5 and 6, at least the above critical rotation speed N, o
The single-phase synchronous generator 2 is driven so as to maintain a low rotational speed NJ2' that is larger than the rotational speed NJ2'.

(Problem to be Solved by the Invention) However, driving the single-phase synchronous generator 2 in an attempt to maintain the above-mentioned low rotational speed Nβ' means that even though there is no load, the single-phase synchronous generator 2 2 will generate an unnecessarily large amount of electric power, and as a result, the engine l driving this single-phase synchronous generator 2 will generate unnecessary noise and also cause the inconvenience of wasting fuel. Become.

(Object of the Invention) The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to suppress generation of unnecessary engine noise and wasteful fuel consumption.

(Structure of the Invention) A feature of the present invention for achieving the above object is that a single-phase synchronous generator and a magnet generator are each driven by an engine, and one of the two generators is driven by an engine. On the other hand, the circuit switching means is used to selectively connect the load via the power supply circuit, and when the voltage generated by the generating winding of the single-phase synchronous generator exceeds a predetermined voltage, the circuit switching means connecting the supply circuit to the single-phase synchronous generator, while the circuit switching means connects the power supply circuit to the magnet generator when the voltage generated by the power generation winding falls below the predetermined voltage; The present invention is characterized in that a current detection control section for detecting the current flowing through the power supply circuit is provided, and the rotation speed of the engine is controlled by an output signal of the current detection control section.

(for production) The effects of the above configuration are as follows.

In FIGS. 1 and 2, when the single-phase synchronous generator 2 exceeds a predetermined low rotational speed Nβ that is higher than the critical rotational speed No, that is, the voltage generated by the power generation winding 3 of the single-phase synchronous generator 2 ( 2
When the voltage (shown by a solid line in the figure) exceeds a predetermined voltage VI2, the load 5 is connected to the single-phase synchronous generator 2 by the single-circuit switching means 20. Also, at this time, the current detection control unit 8 detects the current flowing through the power supply circuit 4, and uses the detection signal to increase the speed of the engine 1 and maintain the single-phase synchronous generator 2 at a predetermined rated rotation speed Nh. The power generation winding 3 outputs the rated voltage V. Therefore, this single-phase synchronous generator 2 supplies desired power to the load 5.

Next, when the load 5 disappears by, for example, opening the switch 6, the current flowing through the power supply circuit 4 becomes zero, and the current detection control unit 8 detecting this reduces the speed of the engine l. At this time, when the rotation speed of the single-phase synchronous generator 2 becomes lower than the low rotation speed NI2, that is, when the output voltage of the power generation winding 3 falls below the predetermined voltage Ve, the one-circuit switching means 2
0 connects the load 5 to the magnet generator 16.

Here, the output voltage of the magnet generator 16 (shown by the dotted chain line in FIG. 2) has a characteristic that it is proportional to its rotation speed. Therefore, when the rotational speed of the single-phase synchronous generator 2 reaches a low rotational speed n lower than the critical rotational speed NO, the output voltage of the single-phase synchronous generator 2 becomes zero, but the load 5 is connected to the magnet generator 16 via
A low voltage V commensurate with the low rotational speed n is applied to the power supply circuit 4.

Therefore, after that, when the load 5 is generated by closing the switch 6, etc., current begins to flow through the power supply circuit 4 to which the low voltage V is applied by the magnet power generation m l 6 as described above. The current detection control section 8 detects this and increases the speed of the engine l. When the single-phase synchronous generator 2 driven by the engine 1 exceeds the low rotational speed Nβ, the circuit switching means 20 connects the load 5 to the single-phase synchronous generator 2 as described above. Electric power from the generator 2 is again supplied to the load 5. Also, along with this,
The current detection control unit 8 detecting the current flowing through the power supply circuit 4 speeds up the engine 1 to return the single-phase synchronous generator 2 to the rated rotation speed Nh.

According to the above configuration, when there is no load 5, it is not necessary to maintain the single-phase synchronous generator 2 above the critical rotation speed No.
By driving at a rotation speed n lower than , it is sufficient to apply a minimum voltage to the power supply circuit 4 that is sufficient for the current detection control section 8 to operate when the load 5 is generated thereafter. .

Therefore, the required number of rotations of the engine 1 during the no-load state can be made sufficiently lower than that of the prior art.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

Note that this embodiment has the same basic configuration and operation as the prior art shown in FIG. Therefore, the common configurations will be given their reference numerals in the drawings and their explanations will be omitted, and only the different configurations will be explained.

A magnet generator 16 driven by the engine 1 together with the single-phase synchronous generator 2 is provided. The magnet power generator [16] includes a load power generation winding 17 and a power generation winding 18 for the current detection control section 8, which are independent of each other. The power generation winding 18 for current detection is connected to the load 5 through the current detection control section 8.
It is said to be the power source.

Further, circuit switching means 20 is provided for selectively connecting the load 5 to either the single-phase synchronous generator 2 or the magnet generator 16 via the power supply circuit 4. This circuit switching means 20 is of an electromagnetic contact type,
It is composed of a changeover switch 21 and a coil 22 that operates the changeover switch 21 with the power of the power generation winding 3.

That is, when the first power generation winding 3 outputs a voltage and this exceeds a predetermined voltage Vff, the coil 22 causes the changeover switch 21 to connect the load 5 to the power generation winding L93 (as shown in the virtual diagram in FIG. 1). The output voltage of the power generation winding 3 is the predetermined voltage vf.
When it drops below 2.

A changeover switch 21 connects the load 5 to the load power generation winding 17 (shown in solid cotton in FIG. 1).

Although the above is based on the illustrated example, the single-phase synchronous generator 2 is
A VR (automatic voltage regulator) may be provided, and the current transformer 9 of the current detection control unit 8 may be replaced with a Hall element that detects the presence or absence of a magnetic field.

Further, it is preferable that the current detection power generation winding II I8 is a separate circuit from the load power generation winding 17. The reason is,
When the load 5 is connected to the magnet generator 16, if the load 5 is large, the output voltage of the magnet generator 16, which has a small power generation capacity, will be consumed, which may interfere with the control of the current detection control section 8. This is because there is. Further, in this case, the power source for the current detection control section 8 may be obtained from a battery instead of the power generation winding 18.

Further, the circuit switching means 20 may be configured by a voltage detector and a relay.

Furthermore, especially when the engine 1 is equipped with a flywheel magneto and ignition is performed by the ignition coil 24, the magnet generator 16 may utilize a part of this flywheel magneto.

Furthermore, the low rotational speed N2 may be the same value as the critical rotational speed No.

(Effects of the Invention) According to the present invention, a single-phase synchronous generator and a magnet generator are each driven by an engine, and a load is applied to one of the two generators via a power supply circuit. A circuit switching means for selectively connecting the power supply circuit is provided, and when the voltage generated by the power generation winding of the single-phase synchronous generator exceeds a predetermined voltage, the circuit switching means connects the power supply circuit to the single-phase synchronous generator. On the other hand, when the voltage generated by the power generation winding falls below the predetermined voltage, the circuit switching means connects the power supply circuit to the magnet generator, and detects the current flowing through the power supply circuit. Since a detection control section is provided and the rotation speed of the engine is controlled by the output signal of this current detection control section,
When there is no load, there is no need to keep the single-phase synchronous generator above the critical rotation speed as in the past; that is, by driving the magnet generator at a low rotation speed lower than the critical rotation speed, Thereafter, when a load occurs, a minimum voltage sufficient to enable the current detection control section to detect the load may be applied to the power supply circuit.

Therefore, the required rotational speed of the engine during the no-load state can be made sufficiently lower than that of the conventional engine, and unnecessary noise generation and wasteful fuel consumption by the engine can be suppressed accordingly.

(Margin below)

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is an overall circuit diagram, FIG. 2 is a graph showing the relationship between the rotational speed of the generator and the output voltage, and FIGS. 4 shows a conventional example, FIG. 3 is a diagram corresponding to FIG. 1, and FIG. 4 is a diagram corresponding to FIG. 2. l...Engine, 2°...Single-phase synchronous generator, 3...Generating winding, 4...Power supply circuit, 5...Load. 8...Current detection control unit, 16...Magnet generator, 20...
Circuit switching means, V2...predetermined voltage. Figure 1 Figure

Claims (1)

[Claims] 1. A single-phase synchronous generator and a magnet generator are each driven by an engine, and circuit switching means is provided for selectively connecting a load to one of the two generators via a power supply circuit. and when the voltage generated by the generator winding of the single-phase synchronous generator exceeds a predetermined voltage, the circuit switching means connects the power supply circuit to the single-phase synchronous generator, while controlling the voltage generated by the generator winding. When the voltage drops below the predetermined voltage, the circuit switching means connects the power supply circuit to the magnet generator, and a current detection control unit is provided to detect the current flowing through the power supply circuit. An engine-driven power generation device in which the rotation speed of the engine is controlled by an output signal from a control section.