JP2017208888A - Wireless power supply system to rotor, and turbine system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless power supply system to a rotor which can align the phases of radio waves radiated from power transmission antennas without provision of a phase shifter.SOLUTION: In the wireless power supply system which supplies drive power for transmitters, disposed on the rotor, from a plurality of oscillators 1 through annularly disposed power transmission antennas 2, the oscillators 1 are annularly disposed corresponding to the respective power transmission antennas 2. The oscillators 1 which are adjacent counterclockwise and clockwise to one oscillator 1, which is driven first by an oscillation trigger signal, are driven by oscillation trigger signals. Further, the oscillator 1 which is adjacent counterclockwise and the oscillator 1 which is adjacent clockwise are successively driven by respective oscillation trigger signals. Each power transmission antenna 2 is connected to each oscillator 1 by a wire 4 of an identical length.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless power feeding system and a turbine system for a rotating body, and is useful when applied wirelessly to a transmitter that transmits information used for monitoring a rotating machine such as a turbine.

  As an operation monitoring system for monitoring the operation status of the turbine, a sensor for detecting a predetermined physical quantity such as distortion or temperature of the moving blade of the turbine is disposed on the moving blade, and a detection signal representing the physical quantity detected by the sensor is fixed. A configuration is proposed in which predetermined signal processing is performed by wireless transmission to the side (ground side).

  In this type of operation monitoring system, a plurality of transmitters together with a plurality of sensors are arranged on the moving blade (rotating body side), and a detection signal representing a predetermined physical quantity is sent to the fixed side via each transmitter. Here, the driving power of the transmitter is supplied from the fixed side by the wireless power feeding system.

  FIG. 6 is a block diagram showing a wireless power feeding system according to the prior art. As shown in the figure, to each oscillator 01 on the fixed side, a plurality of power transmission antennas 02 arranged in an annular shape are connected by wiring 04 through an amplifier 03, respectively. Each oscillator 01 is connected in parallel to one reference trigger generator 010, and is driven all at once by an oscillation trigger signal sent from the reference trigger generator 010.

  On the other hand, on the rotating body side, a plurality (six in the figure) of power receiving modules 05 incorporated in each transmitter (the body is not shown) are arranged in an annular shape together with the transmitter on, for example, a turbine blade (not shown). It is installed. Thus, the radio wave radiated toward the power receiving module 05 via the power transmitting antenna 02 is converted into electric power by the power receiving module 05 and supplied as driving power for a predetermined load such as a transmitter main body or a sensor. The transmitter driven by such electric power wirelessly sends a detection signal representing a predetermined physical quantity detected by the sensor, such as distortion and temperature of the moving blade, to a fixed-side signal processing device (not shown).

  In the wireless power feeding system as described above, the radio wave radiated from each power transmission antenna 02 causes a phase shift caused by the difference in the length of the wiring 04 from the oscillator 01 to the power transmission antenna 02. That is, since each oscillator 01 oscillates a high-frequency signal in the order of GHz, the influence of the phase shift of the oscillation signal delayed according to the length of the wiring 04 becomes significant, and the signal from the adjacent power transmission antenna 02 Interference occurs, causing a reduction in the level of received power on the power receiving side.

  More specifically, FIG. 7 is a schematic diagram conceptually showing the positional relationship between the wiring and the power transmitting antenna connected thereto in the prior art and the power receiving module. As shown in the figure, the power level received by one power receiving module 05 is most strongly influenced by the intensity of the radio wave radiated from the power transmitting antenna 02A facing directly in front of the power receiving module 05, and then the power transmission on both sides thereof. It is affected by the intensity of radio waves radiated from the antennas 02B and 02C. Here, each power receiving module 05 faces the fixed-side power transmitting antennas 02B, 02A, and 02C sequentially with the rotation of the moving blades.

  Here, when the lengths of the wirings 04A, 04B, 04C from the oscillators 01A, 01B, 01C to the power transmission antennas 02A, 02B, 02C are different, the radio waves radiated from the power transmission antennas 02A, 02B, 02C are wired to the wiring 04A. It has a predetermined phase difference corresponding to the difference in length between 04B and 04C. That is, in FIG. 7, for example, the wiring 04C from the oscillator 05C to the power transmission antenna 02C is longer than the length of the wiring 04A from the oscillator 05A to the power transmission antenna 02A by the addition of the distances d1, d2, and d3. The length of the wiring 04B from the oscillator 05B to the power transmission antenna 02B is also different from the length of the wiring 04A.

Therefore, when no measures are taken, the power level characteristics of the radiated radio waves from the power transmission antennas 02B and 02C with respect to the power transmission antenna 02A are as shown by solid lines 04B1 and 04C1 in FIG. Here, FIG. 8 is a characteristic diagram showing the strength (power level) of the radio waves of the power transmission antennas 02B, 02A, and 02C at the position where the power reception module 05 shown in FIG. 7 faces the power transmission antenna 02A. This corresponds to the positions of the antennas 02B, 02A, and 02C. As shown in FIG. 8, the radio wave intensity peaks of the power transmission antennas 02B and 02C are lower by the phase difference than the radio wave intensity peak of the power transmission antenna 02A. In this case, the power level P03 received by the power receiving module 05 directly facing the power transmitting antenna 02A is the power level P01 caused by the radio waves radiated from the power transmitting antenna 02A, and the power level P02 caused by the radio waves radiated from the power transmitting antennas 02B and 02C. Will be added. That is, P03 = P01 + 2 · P02.

  In contrast, in the wireless power feeding system according to the related art shown in FIG. 6, the phase of the radio wave radiated from each power transmission antenna 02 is made uniform by interposing the phase shifter 06 between the oscillator 01 and the power transmission antenna 02. . As a result, a decrease in the radio field intensity of the power transmission antennas 02B and 02C is suppressed, and the intensity characteristics (power level characteristics) of the radio waves radiated from the power transmission antennas 02B and 02C and received by the power reception module 05 are shown by dotted lines 04B2, It is improved as shown by 04C2. As a result, the power level P05 received by the power receiving module 05 facing the power transmitting antenna 02A is set to the power level P01 caused by the radiated radio waves from the power transmitting antennas 02B and 02C. It will be an addition. That is, P05 = P01 + 2 · P04. In the prior art, by providing the phase shifter 06, the power level characteristic is improved by the difference between the power level P05 and the power level P03.

  Thus, in the prior art, not only the frequency of the radio wave radiated from each power transmission antenna 02 but also the phase shift caused by the length of the wiring 04 is removed so that the phase of the radio wave radiated from each power transmission antenna 02 is aligned. The oscillation frequency of the oscillator 01 is controlled and the phase shift amount is adjusted by the phase shifter 06.

  Patent Document 1 is a known document that discloses a technique for supplying power to a transmitter on a rotating body side by wireless power feeding.

JP 2016-39464 A

  In the wireless power feeding system according to the related art shown in FIG. 6, the phase shifter 06 for correcting the phase delay due to the difference in the length of the wiring 04 is provided, so that the phase shifter 06 is installed on the fixed side. In addition to being a factor that hinders downsizing, the adjustment of the phase shift amount of the phase shifter 06 that needs to be performed individually for each phase shifter 06 is troublesome, and this requires a lot of time. .

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a wireless power feeding system and a turbine system for a rotating body capable of aligning the phase of a radio wave radiated from a power transmission antenna without providing a phase shifter. To do.

The aspect of the wireless power feeding system according to the present invention that achieves the above object is characterized by the following points.
1) A wireless power feeding system to a rotating body that supplies driving power from a plurality of oscillators to a transmitter disposed in a rotating body via a power transmitting antenna disposed in an annular shape,
The oscillator is arranged in an annular shape corresponding to each of the power transmission antennas, and an oscillator adjacent in the counterclockwise direction and the clockwise direction is transmitted from the reference oscillator from one reference oscillator that is first driven by an oscillation trigger signal. An oscillation trigger signal that is driven by an oscillation trigger signal that transmits the oscillator adjacent in the counterclockwise direction and the oscillator that is adjacent in the clockwise direction from the oscillator that is adjacent in the clockwise direction and the oscillator that is adjacent in the counterclockwise direction. In order,
Each of the power transmission antennas is connected to each of the oscillators with the same length of wiring.

2) In the above 1), an even number of the oscillators are provided except for the reference oscillator.

3) In the above 1) or 2), the transmitter is disposed on a moving blade of a turbine.

Moreover, the aspect of the turbine system which has the said wireless electric power feeding system is characterized by the following points.
4) A sensor that is disposed on the rotor blade of the turbine and detects a predetermined physical quantity including distortion and temperature of the rotor blade, and a detection signal that represents the physical quantity that is disposed on the rotor blade and detected by the sensor are input. And a turbine system including an operation monitoring system having a transmitter for wireless transmission toward a fixed-side receiver,
The wireless power feeding system to the rotating body described in 3) above is applied as a wireless power feeding system that supplies driving power for the transmitter.

  In the present invention, the received power based on the radio wave received by the power receiving module includes the incoming radio wave from the front power transmitting antenna facing the power receiving module, and the power transmitting antenna adjacent to the power transmitting antenna facing the counterclockwise and clockwise directions. It is almost dominantly determined according to the incoming radio wave.

  Here, in the wireless power feeding system according to the present invention, the oscillator and the power transmission antenna are connected by the same length of wiring, and the oscillator, the power transmission antenna, and the wiring are all arranged in an annular shape with the same layout. As a result, no radio wave phase difference caused by the wiring length difference occurs. Therefore, the phase shifter provided in the wireless power feeding system of the prior art can be removed. Further, each oscillator is driven by sequentially sending an oscillation trigger signal from a single reference oscillator to counter oscillators counterclockwise and clockwise. As a result, the wiring for transmitting the oscillation trigger signal can be shortened as much as possible, and coupled with the fact that the phase shifter can be removed, downsizing and cost reduction of the fixed-side device can be realized.

1 is a block diagram showing a wireless power feeding system according to an embodiment of the present invention. It is a block diagram which shows the arrangement | positioning of the apparatus in the fixed side of embodiment shown in FIG. 1 in the state seen from the front. It is a schematic diagram which shows notionally the positional relationship of the oscillator in this embodiment, the power transmission antenna connected to this, and a power receiving module. FIG. 4 is a characteristic diagram showing radio wave intensity (power level) at a position where the power receiving module shown in FIG. 3 faces the power transmission antenna. It is a block diagram which shows the gas turbine system which concerns on other embodiment of this invention. It is a block diagram which shows the wireless electric power feeding system which concerns on a prior art. It is a schematic diagram which shows notionally the positional relationship of the power transmission antenna connected to the wiring in this prior art and this, and a power receiving module. It is a characteristic view which shows the intensity | strength (electric power level) of the electromagnetic wave in the position where the power receiving module shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that each embodiment described below is merely an example, and there is no intention of excluding various modifications and technical applications that are not explicitly described in the following embodiment. Each configuration of the following embodiments can be implemented with various modifications without departing from the spirit thereof, and can be selected as necessary or can be appropriately combined.

<Embodiment of Wireless Power Supply System>
FIG. 1 is a block diagram showing a wireless power feeding system according to an embodiment of the present invention. As shown in the figure, the wireless power feeding system according to this embodiment includes a transmitter disposed on a rotating body such as a moving blade of a turbine from a plurality of oscillators 1 via a power transmission antenna 2 disposed in an annular shape. (The main body is not shown). Here, the power receiving module 5 converts electromagnetic energy based on the received radio wave into electric power and supplies it as driving power for the transmitter. The electric power converted by the power receiving module 5 is also used as a power source for a sensor that detects a predetermined physical quantity to be monitored during operation, such as temperature and strain of a rotating body such as a moving blade of a turbine. Here, the power receiving modules 5 are normally arranged in a ring shape so that a smaller number (six in the figure) than the power transmitting antennas 2 face each power transmitting antenna 2.

  FIG. 2 is a block diagram showing the arrangement of devices on the fixed side of the present embodiment shown in FIG. 1 as seen from the front. Hereinafter, FIG. 2 will be added to FIG. 1 and the present embodiment will be described based on both drawings.

  The oscillator 1 is arranged in an annular shape corresponding to each power transmission antenna 2. Then, one reference oscillator 11 is first driven by the oscillation trigger signal generated by the reference trigger generator 10, and then the oscillator 1 adjacent in the counterclockwise direction and the clockwise direction is transmitted from the reference oscillator 11 from the reference oscillator 11. Each is driven by an oscillation trigger signal. Subsequently, the oscillator 1 adjacent in the counterclockwise direction and the oscillator 1 adjacent in the clockwise direction are connected to the respective oscillators 1 in the clockwise direction (reference oscillator 11 side) and in the counterclockwise direction (reference oscillator 11 side). Driven sequentially by an oscillation trigger signal sent from the adjacent oscillator 1. That is, each oscillator 1 starts a predetermined oscillating operation while sequentially moving counterclockwise and clockwise by an oscillation trigger signal sent from the adjacent oscillator 1 in the clockwise direction and counterclockwise. Here, in the present embodiment, all the wires 4 from each oscillator 1 to the power transmitting antenna 2 via the amplifier 3 have the same length. That is, the power transmission units formed by the oscillator 1, the amplifier 3, and the power transmission antenna 2 are all configured in an annular shape with the same configuration.

  Here, the code of the power transmission unit to which the first reference oscillator 11 to be driven first belongs is (Zero), and the codes of the power transmission units sequentially adjacent in the counterclockwise and clockwise directions from the power transmission unit (Zero) are counterclockwise. Regarding the direction, A-1, A-2, A-3,..., A- (N-2), A- (N-1), A-N, and B- 1, B-2, B-3,..., B- (N-2), B- (N-1), and B-N.

  Thus, each power transmission unit (A-1) and (B-1) starts to be driven by the oscillation trigger signal generated by the reference trigger generator 10, and the power transmission unit (A-2) is adjacent to the power transmission unit in the clockwise direction. Driving is started by an oscillation trigger signal sent from the oscillator 1 of (A-1). The power transmission unit (B-2) is driven by an oscillation trigger signal sent from the oscillator 1 of the power transmission unit (B-1) adjacent in the counterclockwise direction.

  In the same manner, driving of the power transmission units (A-3) to (A-N) and the power transmission units (B-3) to (B-N) is sequentially started. As a result, the number after the hyphen is the same in the counterclockwise direction and the clockwise direction, that is, for example, radio waves having completely the same phase are radiated from the power transmission unit (A-3) and the power transmission unit (B-3). The Therefore, the radio waves radiated from the power transmission unit (A-N) and the power transmission unit (B-N) also have the same phase.

  As described above, in this embodiment, each oscillator 1 is sequentially driven counterclockwise and clockwise by the oscillation trigger signal sent from the oscillator driven immediately before, so that the wiring length required for the trigger of the oscillator 1 (oscillator 1 Of the oscillation trigger signal between adjacent transmission units generated in accordance with the wiring length can be minimized. can do. As a result, the power transmission unit (Zero), the power transmission units (A-1) to (A-N), and the power transmission units (B-1) to (B-N) have the same length as the wiring 4. Thus, the phase shift of the radio waves radiated from the power transmission antennas 2 can be minimized and the phases can be well aligned. Further, the wiring for transmitting the oscillation trigger signal for driving the oscillator 1 can be shortened. As a result, it is possible to contribute to the miniaturization of the system through the reduction of the installation space of the fixed device.

  More specifically, as shown in FIG. 3, which is a characteristic corresponding to FIG. 7 in the prior art, the level of power received by one power receiving module 5 is radiated from the power transmitting antenna 2 </ b> A facing directly in front of the power receiving module 5. It is most strongly influenced by the intensity of the transmitted radio waves, and is then influenced by the intensity of the radio waves radiated from the power transmission antennas 2B and 2C on both sides thereof. Here, the lengths of the wirings 4A, 4B, and 4C from the oscillators 1A, 1B, and 1C to the power transmission antennas 2A, 2B, and 2C are the same, and the oscillation timings of the oscillators 1 are slightly shifted. Therefore, the radio waves radiated from the power transmission antennas 2A, 2B, 2C are aligned with almost no deviation.

  FIG. 4 is a characteristic diagram showing the intensity (power level) of radio waves at the position where the power receiving module 5 shown in FIG. 3 faces the power transmitting antenna 2, and corresponds to FIG. As shown in FIG. 4, in this case, the power level obtained from the power transmission antennas 2B and 2C is obtained from the power transmission antennas 2B and 2C as indicated by solid lines 4B1 and 4C1 in FIG. 4, and the dotted lines 4B2 and 4C2 in FIG. It is almost the same even if it is slightly smaller than the ideal power level shown in. Here, the ideal power level is a power level when the phase difference between the radio waves radiated from the power transmission antennas 2A, 2B, and 2C is zero, and is obtained from the power transmission antenna 2A indicated by a solid line 4A1 in FIG. The power level is equivalent to the radio wave that is received.

  In the present embodiment, the power level P3 received by the power receiving module 5 directly facing the power transmitting antenna 2A is the power level P1 caused by the radio waves radiated from the power transmitting antenna 2A, and the power caused by the radio waves radiated from the power transmitting antennas 2B and 2C. The level P2 is added. That is, P3 = P1 + 2 · P2. On the other hand, the maximum power level P5 in this case is the sum of the power level P1 and twice the power level P4 of the dotted lines 4B2, 4C2 at the position where the power receiving module 5 faces the power transmitting antenna 2A, that is, P5 = P1 + 2 · P4. Given in. The power level P3 is only slightly smaller than the power level P5. That is, in the present embodiment, a power level P3 equivalent to or higher than that can be obtained without using a phase shifter as in the prior art. In particular, when the power transmission units (A-N) and (B-N) that are considered to be completely in phase are included, the best power level characteristic is obtained.

  In the present embodiment, except for the reference oscillator 11, a total of N power transmission units (A-1) to (AN) and power transmission units (B-1) to (B-1) to (N) in the counterclockwise and clockwise directions. B-N) is provided, but the present invention is not limited to this. It may be an odd number. However, in the case of an even number, the phases of the radio waves radiated from the power transmission units (A-N) and (B-N) at the position opposite to the reference oscillator 11 as described above can be perfectly aligned.

<Embodiment of Turbine System>
FIG. 5 is a block diagram showing a gas turbine system according to another embodiment of the present invention. As shown in the figure, the gas turbine main body 100 has a compressor 101, a fuel tank 102, a combustor 103, a turbine chamber 104, a moving blade 105, a stationary blade 106, and a rotating shaft 107. The acting force is output as the rotational driving force of the rotary shaft 107. More specifically, the compressor 101 compresses the sucked air and supplies it to the combustor 103. The fuel stored in the fuel tank 102 is pumped up by the pump 108 and supplied to the combustor 103. As a result, in the combustor 103, fuel is combusted under compressed air to generate a high temperature / high pressure driving gas. The driving gas expands between the stationary blade 106 and the moving blade 105 in the turbine chamber 104 to generate a driving force, and rotates the rotating shaft 107 about the axis through the moving blade 105.

  The gas turbine system according to the present embodiment is a combination of the gas turbine main body 100, the wireless power feeding system 200, and the operation monitoring system 300. The wireless power feeding system 200 is according to the embodiment described with reference to FIG. Therefore, in FIG. 5, the same parts as those in FIG.

  A plurality of sensors 20 that measure the distortion and temperature are disposed on the rotor blade 105 that is the rotating body of the turbine body 100 in the present embodiment. A detection signal representing a predetermined physical quantity detected by each sensor 20 is directed toward the antenna 32 on the fixed side (ground side) via a transmitter 21 provided in plural on the moving blade 105 that is a rotating body together with the sensor 20. Radiated as radio waves. The detection signal received by the receiver 33 via the antenna 32 is generated as information representing the operation status of the gas turbine main body 100 by performing predetermined signal processing by the signal processing device 34, and the display unit 35 as necessary. Is displayed. Here, the transmitter 21 has a built-in power receiving module 5 (see FIG. 1), and necessary driving power is wirelessly supplied from the wireless power feeding system 200 via the power receiving module 5.

  Therefore, according to the present embodiment, the predetermined operation information related to the moving blade 105 of the gas turbine 100 is stably fixed over a long period of time by the transmitter 21 charged with driving power with high efficiency by the wireless power feeding system shown in FIG. Can be sent to the side. As a result, proper operation monitoring of the gas turbine main body 100 can be performed.

<Other embodiments>
In the above embodiment, the rotor blade of the gas turbine is taken as an example of the rotating body, but the present invention is not limited to this. There is no particular limitation as long as electric power as electromagnetic energy is supplied to the transmitter disposed in the rotating body, and the invention can be widely applied.

Zero, (A-1) to (A-N), (B-1) to (B-N) Power transmission unit 1 Oscillator 2 Power transmission antenna 4 Wiring 5 Power reception module 10 Reference trigger generator 20 Sensor 21 Transmitter 100 Gas turbine Main body 105 Rotor blade (rotating body)
200 Wireless power supply system 300 Operation monitoring system

Claims (4)

A wireless power feeding system to a rotating body that supplies driving power from a plurality of oscillators to a transmitter disposed in a rotating body via a power transmission antenna disposed in an annular shape,
The oscillator is arranged in an annular shape corresponding to each of the power transmission antennas, and an oscillator adjacent in the counterclockwise direction and the clockwise direction is transmitted from the reference oscillator from one reference oscillator that is first driven by an oscillation trigger signal. An oscillation trigger signal that is driven by an oscillation trigger signal that transmits the oscillator adjacent in the counterclockwise direction and the oscillator that is adjacent in the clockwise direction from the oscillator that is adjacent in the clockwise direction and the oscillator that is adjacent in the counterclockwise direction. In order,
The wireless power feeding system for a rotating body, wherein the power transmission antennas are connected to the oscillators by wires of the same length.   The wireless power feeding system for a rotating body according to claim 1, wherein an even number of said oscillators are arranged except for said reference oscillator.   The wireless power feeding system for a rotating body according to claim 1 or 2, wherein the transmitter is disposed on a moving blade of a turbine. A sensor for detecting a predetermined physical quantity including strain and temperature of the rotor blade disposed on the rotor blade of the turbine, and a detection signal representing the physical quantity detected by the sensor disposed on the rotor blade are input and fixed. In a turbine system including an operation monitoring system having a transmitter for wireless transmission toward a receiver on the side,
A turbine system, wherein the wireless power feeding system for a rotating body according to claim 3 is applied as a wireless power feeding system that supplies driving power of the transmitter.

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