JPH0619358Y2 - AC generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention uses a multi-pole high-speed rotating high-frequency generator and excites its field with a width modulation inversion pulse to obtain a desired low-frequency output, for example, The present invention relates to an alternating-current power generation device adapted to obtain a commercial frequency output of 50 Hz or 60 Hz.

[Prior Art and Problems] Various AC generators using a multi-pole high-speed rotation type high-frequency generator that is compact and provides high output have been proposed.

It is well known that in an alternator, a higher output can be obtained by increasing the rotation speed of the rotor, and the output can be downsized by increasing the rotation speed. This also applies to multipolarization.

However, when trying to obtain a low-frequency output such as a commercial frequency using a multi-pole high-speed rotation type high-frequency generator, there are various problems in practice, and it is difficult to realize it. Generally, a thyristor is used to control the conduction of the output from the output winding of the high frequency generator to convert the high frequency output to the low frequency output, but in that case, the circuit configuration and the configuration of the control device become complicated. However, there are problems that it is difficult to control commutation when switching from positive to negative and from negative to positive, and that switching is not performed smoothly and a smooth converted output waveform cannot be obtained.

[Purpose of device]

The present invention is based on the above-mentioned invention, and provides an alternating-current generator capable of obtaining a low-frequency output such as a commercial frequency with a simple configuration using a multi-pole high-speed rotation type high-frequency generator. The purpose is.

[Constitution of device]

Therefore, the AC power supply device of the present invention comprises a multi-pole high-speed rotation type high frequency generator (1) having an output winding (3), an excitation winding (4) and a field winding (2), and the above-mentioned excitation. An excitation current is supplied to the field winding (2) on the basis of the output of the winding (4), and the output of the output winding (3) is compared with a preset reference value, and the result is compared. Control means (5) for controlling the supply of the exciting current, and the fundamental frequency of the induced voltage induced in each of the output winding (3) and the exciting winding (4) is a predetermined frequency. An alternating-current power generator selected to have an integral multiple, wherein the control means (5) is configured so that the output of the output winding (3) has a positive pulsating flow at the fundamental frequency and a negative pulsating flow at the fundamental frequency. Flow and the result of filtering the output of the output winding (3) The field winding (2) is excited by a pulse that is inverted every half wave of the fundamental frequency so that the pressure frequency becomes the predetermined frequency, and the output of the output winding (3) is generated. It is characterized in that the inverted pulse changes its pulse width so that each half wave of the filtered voltage of the predetermined frequency forms an orthodox wave.

[Example of device]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a diagram for explaining the correspondence between an excitation waveform and an output waveform, and FIG. 3 is a high frequency for obtaining a commercial frequency output having a waveform close to a sine wave. FIG. 4 is a diagram showing an example of setting a peak value of output, and FIG. 4 is a diagram showing a configuration of one embodiment of a control circuit to which the present invention is applied.

In FIG. 1, 1 is a rotor, 2 is a field winding, 3 is an output winding, 4 is an excitation winding, 5 is a control circuit, and 6 is an output terminal. The rotor 1 has a 6-pole structure, and the field winding 2 is excitation-controlled by the control circuit 5. The control circuit 5 detects the output voltage of the output winding 3 and controls the excitation of the field winding 2 according to the output voltage. The output of the excitation winding 4 serves as an excitation power source for the field winding 2 at that time. In the present invention, the frequency of the output winding 3 before being controlled is further selected to be an integral multiple of a desired frequency such as a commercial frequency (50 Hz or 60 Hz). For example, a frequency 30 which is 6 times the commercial frequency 50Hz
Suppose you chose 0 Hz. In this case, from the number of poles of 6 and the frequency of 300 Hz, the rotation speed of the high frequency generator is 6000 rp.
It becomes m. Fig. 2 shows (a) through
It is shown that when the excitation waveform shown in (e) is applied to the field winding 2, the respective waveforms shown in (f) to (j) are obtained as output waveforms from the output winding 3. Generally, conventionally, the field winding 2 is DC-excited by the excitation waveform as shown in FIG. 2 (a). At this time, 300H as shown in Fig. 2 (f)
The output waveform of z is obtained from the output winding 3. A similar output waveform can also be obtained by performing pulse excitation of the excitation waveform as shown in FIG. 2 (b).

By the way, in this pulse excitation, when the field winding 2 is excited by using the width modulation pulse as shown in FIG. 2 (c), the output waveform amplitude-modulated as shown in FIG. 2 (h) is output. It turns out that it can be obtained from 3. Further, instead of the pulse excitation shown in FIG. 2 (b), the pulse is alternately inverted, as shown in FIG. 2 (d).
When the field winding 2 is excited by using the inversion pulse as shown in FIG. 2, the same pulsating direct current output waveform as the full-wave rectified waveform is obtained from the output winding 3 as shown in FIG. 2 (i). The present invention was devised by focusing on these points. That is, FIG.
As shown in (e), the field winding 2 is switched by the width modulation reversal pulse such that a pulsating current having an average value corresponding to a sine wave is obtained every period (10 msec) corresponding to a half cycle of the commercial frequency. Get excited.

The third is an example of each peak value of the high frequency output when a commercial frequency output with a frequency of 50 Hz and a peak value of 141.4 V is obtained.
It is a figure. With such a voltage, an AC output with a commercial frequency having a waveform corresponding to a sine wave can be obtained by passing through a filter.

1 of a control circuit for controlling the excitation waveform applied to the field winding 2
FIG. 4 shows the configuration of the embodiment. In FIG. 4, reference numerals 2, 4 and 5 respectively correspond to those in FIG.
Reference numeral 1 is a counter, 52 is a reference voltage generation circuit, and 53 is a modulation circuit. The excitation winding 4 has two windings 4A and 4B, and if an output in phase with the output winding is obtained from the winding 4A, an output in the opposite phase is obtained from the winding 4B. Is sent to the counter 51. The counter 51 is
Here, not only a simple counter but a logic circuit and a gate are provided. Then, the zero voltage (the output voltage of the output winding 3 or the output voltage of the excitation winding 4 may be detected) or the position of the magnetic field is detected by a magnetic pickup or a photocoupler (these configurations are directly related to the present invention. Since it is not related, a detailed description is omitted here), and the pulse is counted by the binary counter. By the output of the 12-decimal counter, the output of the excitation winding 4 and the output of the excitation winding 4 are alternately taken out for each half wave to generate the illustrated output, which is sent to the modulation circuit 53 and the switching signal to the reference voltage generation circuit 52. Reference voltage generation circuit 5
2 is a voltage as described with reference to FIG.
V, 115.3 V, and 212 V are generated as reference voltages, and a reference voltage selected according to the switching signal of the counter 51 is supplied to the modulation circuit 53. That is, as will be apparent with reference to FIG. 3, in the half cycle of the commercial frequency, 56.8V for the 1st and 6th, 115.3V for the 2nd and 5th, and the 3rd and Each of the reference voltages is selected to be 212V for the fourth and the like. Although not shown, such a reference voltage may be generated using a known constant voltage generating means such as a constant voltage diode. The modulation circuit 53 excites the field winding 2 by the output of the counter 51, and the detection voltage V
Until _D (the voltage of the output winding) exceeds the reference voltage V _S. In other words, the detection voltage V _D exceeds the reference voltage V _S, as is clear when comparing the excitation waveform 'sent from the modulation circuit 53 to the excitation winding 2 and the output of the counter 51 sent to the modulation circuit 53. And the output of the counter 51 is cut. That part is shown by the dotted line part of the excitation waveform '. It can be considered that the waveform'corresponds to the pulse having the variable pulse width shown in FIG. 2 (e).

FIG. 5 is a view for explaining another embodiment of the present invention. When the frequency of the output winding is set to 300 Hz as in the above-mentioned example, this 300 Hz is not only the commercial frequency of 50 Hz,
It is also an integral multiple of the commercial frequency of 60Hz. Therefore, as shown in Fig. 5 (a), the low frequency output of 60Hz can be obtained as shown in Fig. 5 (b) simply by changing the logic and counter of the control circuit according to the same rotation speed as when obtaining the low frequency output of 50Hz. You can also get

That is, in order to obtain low-frequency outputs of different frequencies, it is sufficient to set a frequency that is a common multiple of those frequencies as the frequency of the output winding. As a result, it is possible to operate the prime mover at an optimum operating point regardless of which frequency the low frequency output is set to, and it is possible to improve the overall power generation efficiency.

In addition, in order to obtain low frequency output over several frequencies, as described above, in addition to setting the frequency (fundamental frequency) of the output winding of the high frequency generator by the common multiple of those frequencies, Of course, it is also possible by changing the rotation speed itself. For example, in the example shown in FIGS. 1 to 4, the rotation speed is 6000 rpm.
From 7200 rpm to 7200 rpm, a commercial frequency output of 60 Hz as shown in FIG. 5 can be obtained with the same configuration without changing the control circuit. Therefore, it is possible to obtain various low-frequency outputs, not limited to the commercial frequency.

[Effect of device]

As is clear from the above description, according to the present invention, since a low frequency output can be obtained by exciting with a width modulation inversion pulse, the output circuit only needs to be provided with a filter, and the circuit configuration is simplified. Also, a low-frequency output can be easily obtained using a multi-pole high-speed rotation type high-frequency generator, and as an AC generator that outputs a commercial frequency, the generator can be significantly downsized and the circuit configuration can be simplified. Can be planned.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a diagram for explaining the correspondence between an excitation waveform and an output waveform, and FIG. 3 is a high frequency for obtaining a commercial frequency output having a waveform close to a sine wave. FIG. 4 is a diagram showing an example of setting a peak value of an output, FIG. 4 is a diagram showing a configuration of one embodiment of a control circuit to which the present invention is applied, and FIG. 5 is a diagram explaining another embodiment of the present invention. 1 ... Rotor, 2 ... Field winding, 3 ... Output winding, 4 ...
… Excitation winding, 5 ... Control circuit, 6 ... Output terminal, 51 ...
... counter, 52 ... reference voltage generation circuit, 53 ... modulation circuit.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masahiro Nagata Masahiro Nagata No. 3 Hayakawa, Hayakawa, Nitta-cho, Nitta-gun, Gunma Sawafuji Electric Co., Ltd. Nitta factory (56) References )

Claims (1)

[Scope of utility model registration request] 1. A multi-pole high-speed rotary high-frequency generator (1) having an output winding (3), an excitation winding (4) and a field winding (2), and the excitation winding (4). The excitation current is supplied to the field winding (2) on the basis of the output of the above, and the output of the output winding (3) is compared with a preset reference value, and the excitation current of the excitation current is changed according to the comparison result. A control means (5) for controlling supply is provided so that the fundamental frequency of the induced voltage induced in each of the output winding (3) and the excitation winding (4) is an integral multiple of a predetermined frequency. The control means (5) is characterized in that the output of the output winding (3) repeats positive pulsating flow at the fundamental frequency and negative pulsating flow at the fundamental frequency. The frequency of the voltage that is given and is the result of filtering the output of the output winding (3) is the above specified value. The field winding (2) is excited by a pulse that is inverted every half wave of the fundamental frequency so that the frequency becomes a frequency, and the output of the output winding (3) is filtered to obtain the predetermined frequency. An AC generator characterized in that the pulse to be inverted is configured to change its pulse width so that each half-wave of the voltage forms an orthodox wave.