JP2008157901A - Anemometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anemometer which can obtain accurate a wind speed signal even in a strong electric field such as steel tower of high voltage power lines. <P>SOLUTION: In this anemometer, a fuselage section equipped with empennage is rotatably pivoted, while a rotor blade for wind sailing is rotatably pivoted on the fuselage section, and a magnetized material 10 is installed in the shaft of the rotor blade. Additionally, it is designed so as to generate an AC signal on a coil installed adjacent to the above magnetized material, wherein this coil consists of a first and a second coils 11, 12 coaxially-arranged, while these first and second coils 11, 12 are series-connected so as to mutually be reversed phase, allowing at least one coil to locate in the magnetic field of the magnetized material 10. Thus accurate wind speed signal can be obtained even in the strong electric field without detecting any foreign electric field. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an AC power generation type anemometer.

Anemometers are roughly classified into AC generators having the same structure as AC generators and those using optical sensors. In particular, since the former method does not require a power source for sensing, it is used for applications where power consumption must be saved, such as unattended measurement in polar regions.

The structure shown in Patent Document 1 is known. As shown in FIG. 6, a propeller 20 for receiving wind is rotatably supported, and a disc-shaped magnet 22 is attached to the shaft 21. A coil 23 is disposed in the vicinity of the magnet 22 so that an electromotive force is generated in the coil 23 as the magnet 22 rotates.

Since this electromotive force becomes an AC signal proportional to the rotation speed of the propeller 20, it operates to calculate the wind speed by measuring this frequency.

The measured data is recorded in a data logger or the like and collected later or transmitted to the outside via a wireless network.
JP-A-8-160063

However, the above-described conventional anemometer may cause an error depending on the installation environment.
In other words, this type of anemometer is generally installed in a place where the weather conditions are severe, but there are cases where it is used for analyzing a weather situation in which a snowstorm freezes like a high-voltage cable in a snowy area.

  In such a case, it is ideal to measure in the vicinity of the transmission line that actually freezes, so it is ideal to install it on the high-voltage line tower, but then the transmission frequency is affected by the effect of the electric field generated from the transmission line. AC will be generated in the coil with the same frequency.

That is, as shown in FIG. 7, the electromotive force W4 induced by the external electric field is combined with the original electromotive force W5 by the magnet 22 and is a signal different from the actual wind speed, for example, the frequency of the power line in the area north of Tokyo. A 50 Hz signal is erroneously recorded, which causes a decrease in data reliability.

An object of the present invention is to provide an anemometer capable of obtaining an accurate wind speed signal even under a strong electric field such as a high-voltage electric wire tower.

In order to solve the above-described problems, the present invention includes the following specific matters.
In the first configuration, the body portion provided with the tail blade is rotatably supported, and the wind receiving rotor blade is rotatably supported on the body portion, and the magnet body is provided on the shaft of the rotor blade, An AC signal is generated in a coil provided adjacent to the magnetized body.

The coil is configured by arranging the first and second coils in the coaxial direction, and is connected in series so that the first and second coils are in reverse phase, and at least one of the coils is a magnetized body. It arrange | positioned so that it might be located in a magnetic field.

As a result, an AC signal having a frequency proportional to the rotation of the magnetized body is output from one of the first and second coils in accordance with the rotation of the magnetized body, and the first and second coils are applied to an external magnetic field. The coil cancels this and does not output an external signal.

Therefore, no error occurs in the detection signal even under a strong electric field such as the vicinity of a high voltage line.

Note that when the first and second coils are connected in series so as to be in opposite phases, two coils wound in reverse may be connected in series as they are, or two coils wound in the same direction may be Both coils may be connected in series with only the first coil having the opposite phase. In short, the connection may be made in such a direction as to cancel the magnetic field applied from the outside.

In the second configuration, the coil is configured by arranging the first and second coils in the coaxial direction, and the first and second coils are connected in series so as to be in reverse phase, and one coil is It is arranged so that the other coil is located in the N magnetic field of the magnetized body while being located in the S magnetic field of the magnetized body.

As a result, an AC signal superimposed in proportion to the rotation of the magnetized body is output from the serial connection terminals of the first and second coils with the rotation of the magnetized body, and the first is applied to the external magnetic field. And the 2nd coil cancels this and does not output an external signal.

In this configuration, an external electric field can be canceled and the original signal intensity is approximately doubled, so that the S / N is further improved.

When one coil is located in the S magnetic field of the magnetized body and at the same time the other coil is located in the N magnetic field of the magnetized body, a part of the disk is the S pole and the opposite side is the N pole. Can be mentioned. In order to improve the accuracy at the time of low rotation by increasing the generated frequency, it is preferable to provide as many poles as the opposite poles such as 6 poles or 10 poles.

Next, in a third configuration, the first and second coils are integrated coils in which half the number of turns is reverse and wound at different positions.

In this configuration, since the coil can be manufactured and assembled together, the production efficiency is extremely good.

  According to the present invention, an AC signal having a frequency proportional to the rotation of the magnetized body is output from one of the first and second coils with the rotation of the magnetized body, and the first is applied to an external magnetic field. And the 2nd coil cancels this and does not output an external signal. Therefore, the detection signal is not affected even under a strong electric field such as the vicinity of a high voltage line, and accurate measurement is possible.

Further, when one coil is positioned in the S magnetic field of the magnetized body and the other coil is positioned in the N magnetic field of the magnetized body, the original signal strength is approximately doubled, so the S / N is further increased. It becomes good.

Further, when the first and second coils are integrated coils in which half the number of turns is reverse and each is wound at a different position, the manufacture becomes easy.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

This will be described with reference to FIGS. 1 to 3 and FIG.
FIG. 1 shows the entire apparatus, and a body 3 having a tail 2 is rotatably supported on a base 1 fixed to a steel tower or the like. The base portion 1 has a cylindrical shape and is positioned inside a cylindrical cover 4 that extends from the lower portion of the body portion 3.

A bearing 5 having very little resistance is inserted between the base part 1 and the cylindrical cover 4 so that the body part 3 can rotate even in a slight wind and the tip part 3a faces the windward side. .

A wind receiving rotary blade 6 is rotatably supported at the distal end portion 3 a of the body portion 3. The shaft 7 of the rotor blade 6 is supported by two bearings 8 and 9 provided inside the body portion 3 so that the rotor blade 6 can rotate even with a slight wind.

A disc-shaped magnetized body 10 is provided at the rear end of the shaft 7. The magnetized body 10 is alternately magnetized with S and N poles along the circumference.

On the other hand, first and second coils 11 and 12 are provided on the upper portion of the base 1. As shown in FIG. 2, the first and second coils 11 and 12 are attached to a holding rod 1 a erected on the upper part of the base part 1 and wound in a donut shape centering on the vertical direction. . The second coil 12 is disposed so that the side surface of the second coil 12 is located in the magnetic field of the magnetized body 10.

As the arrangement position of the first and second coils 11 and 12, it is sufficient that at least one of the coils is located in the magnetic field of the magnetized body 10, but as shown in FIG. The coil 11) may be arranged so that the other coil (second coil 12) is located in the N magnetic field of the magnetized body at the same time as the S magnetic field of the magnetized body 10 is located.

As shown in FIG. 3, the first and second coils 11 and 12 are connected in series so as to have opposite phases to each other, and the first and second coils 11, 12 are rotated as the magnetized body 10 rotates. An AC signal having a frequency proportional to the rotation of the magnetized body 10 is output from any one of 12. In the case shown in FIG. 3, since the same phase alternating current is output from the first and second coils 11 and 12, the output from the output terminals 11a and 12b is approximately doubled.

The operation of the above configuration will be described with reference to FIG. W1 is a pseudo output accompanying an external electric field. W2 indicates a waveform when a doubled output is obtained as the magnetized body 10 rotates, and W3 indicates an output when only one coil is positioned in the magnetic field of the magnetized body 10.

As is apparent from the figure, although the pseudo output accompanying the external electric field is generated in each coil, it does not come out as a composite output because both coils are connected in opposite phases. On the other hand, since the output accompanying the rotation of the magnetized body 10 is output as it is or doubled, by detecting this, accurate and good S / N measurement is possible.

Therefore, no error occurs in the detection signal even under a strong electric field such as in the vicinity of a high voltage line, a substation, or a power plant. Of course, the extraneous inductive component can be canceled even in a high-frequency electric field such as a transmitting station or a relay station.

Note that when the first and second coils are connected in series so as to be in opposite phases, two coils wound in reverse may be connected in series as they are, or two coils wound in the same direction may be Both coils may be connected in series with only the first coil having the opposite phase. In short, the connection may be made in such a direction as to cancel the magnetic field applied from the outside.

A data logger 14 is connected to the output terminals 11a and 12b, and the wind speed is calculated from the input frequency and stored in an internal memory. Further, it is possible to transmit data in real time by attaching a wireless network function to the data logger 14.

In this embodiment, as shown in FIG. 4, the first and second coils 11 and 12 have half the number of turns as a normal winding and the other half as a reverse winding. And the winding position is divided | segmented up and down in the normal winding and the reverse winding. With such a configuration, since the coil (13) capable of canceling external noise can be manufactured as a single unit, production of an anemometer becomes extremely easy.

It is a side view of the internal structure which shows the whole anemometer which concerns on Example 1 of this invention. It is a side view which shows the coil periphery which concerns on Example 1 of this invention. 1 is a substantial circuit diagram according to Embodiment 1 of the present invention. It is a substantial circuit diagram concerning Example 2 of the present invention. It is a graph which shows operation | movement of Example 1 and 2 of this invention. It is a perspective view of the principal part which shows the conventional anemometer. It is a graph which shows operation | movement of the conventional anemometer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base part 2 Tail 3 Body part 4 Cylindrical cover 5 Bearing 6 Rotary blade 8, 9 Bearing 10 Magnetized body 11 1st coil 12 2nd coil 13 Integrated coil 14 Data logger

Claims (3)

While supporting the body part provided with the tail wing on the base part in a freely rotatable manner, the rotor part for receiving wind is rotatably supported on the body part, and a magnetized body is provided on the axis of the rotor wing. In the anemometer configured to arrange the coil in the base portion adjacent to the magnetized body, and the rotor blade always faces the windward side, and the AC signal is generated in the coil with the rotation of the rotor blade,
The coil is configured by arranging the first and second coils in the coaxial direction, and the first and second coils are connected in series so as to be in reverse phase, and at least one of the coils is in the magnetic field of the magnetized body. An AC signal having a frequency proportional to the rotation of the magnetized body is output from one of the first and second coils in accordance with the rotation of the magnetized body, and for an external magnetic field. An anemometer characterized in that the first and second coils cancel each other and do not output an external signal. The coil is configured by arranging the first and second coils in the coaxial direction, and the first and second coils are connected in series so as to be in reverse phase, and one coil is in the S magnetic field of the magnetized body. And the other coil is positioned so as to be located in the N magnetic field of the magnetized body, and is superimposed in proportion to the rotation of the magnetized body from the series connection terminals of the first and second coils as the magnetized body rotates. 2. An anemometer according to claim 1, wherein the alternating current signal is output, and the first and second coils cancel each other against an external magnetic field and no external signal is output. 3. The anemometer according to claim 1, wherein the first and second coils are integral coils in which half of the number of turns is reverse and wound at different positions.

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