Insulation and short-circuit switching device for insulated wheels, line maintenance vehicle, and insulation and short-circuit switching method for insulated wheels

Abstract

To provide an insulation / short-cut switching device of insulation wheels which can reliably obtain power supply voltage in a stable manner and which can reliably combine in an electromagnetic induction manner even if distance between a transmission coil and a power receiving coil varies.SOLUTION: An insulation / short-cut switching device of insulation wheels is configured such that distance capable of electromagnetically inducing is secured by one transmission coil approaching a power receiving coil even when the other transmission coil separates from the power receiving coil because oppositely disposing two sheets of transmission coil on both outsides of the power receiving coil at an interval and then composite voltage of the two sheets of transmission coil is received by the power receiving coil, so that the composite voltage of the two sheets of transmission coil is reliably received by the power receiving coil. A transmission side circuit is configured so as to generate two or more modulation carrier waves (control signal) which apply modulation by two or more modulation waves with distinct frequency to the modulation wave transferring electric power and then send the same to the transmission coil. A power receiving side circuit operates a switch by power system voltage on the basis of the control signal and then makes it possible to switch an inner ring and an outer ring of insulation wheels to dead short-cut, partial short-cut and perfect insulation.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an insulation / short-circuit switching device for an insulated wheel that can switch between complete insulation, complete short-circuit, and LPF short-circuit (partial short-circuit), a maintenance vehicle equipped with the switching device, and an insulation / short-circuit switching method for an insulated wheel.

Background Art

[0002] Maintenance work is performed on railway lines (rails: tracks) using maintenance vehicles. Maintenance work is usually carried out at night. Maintenance work on level crossings is also carried out at night.

[0003] When a train enters the level crossing monitoring area on the track, a level crossing control signal (hereinafter referred to as "barrier and indicator signal") for lowering the barrier of the level crossing and lighting or flashing the indicator light (hereinafter referred to as "lighting") and a level crossing control signal (hereinafter referred to as "alarm signal") for sounding the alarm are flowing. The barrier and indicator signal is a low frequency of about DC to 100 Hz, and the alarm signal is a high frequency of about 8.5 to 10.5 kHz. Both signals are superimposed and flowing.

[0004] The left and right pair of wheels of an operating train are connected by an axle (wheel axle), and are electrically connected through the axle so that the left and right pair of rails are electrically connected. When the operating train enters the level crossing monitoring area, the barrier and indicator signal and the alarm signal flowing on the track flow between the left and right wheels, causing the barrier to lower, the indicator light to light, and the alarm to sound.

[0005] If the wheels of the maintenance vehicle are the same as those of the operating train, when the maintenance vehicle enters the level crossing monitoring area or when performing maintenance work within the level crossing monitoring area, the same operation as when an operating train passes will occur, causing the barrier to lower, the indicator light to light, and the alarm to sound. However, since much of the maintenance work is carried out at night, it is troublesome for the residents near the level crossing when the alarm sounds during the night maintenance work. For this reason, the maintenance vehicle is equipped with insulated wheels in which the inner and outer wheels are insulated by an insulating material.

[0006] When the track maintenance vehicle equipped with insulated wheels stays within the level crossing monitoring area during track maintenance work, it may also pass through the level crossing without staying within the level crossing monitoring area. If the insulated wheels remain in an insulated state, neither the circuit breaker, signal lamp signal, nor the warning signal flowing through the track will flow. Therefore, even if the track maintenance vehicle passes through the level crossing, the circuit breaker will not drop, the signal lamp will not light up, the warning signal will not sound, and the level crossing will not be closed. To solve this problem, when the track maintenance vehicle only passes through the level crossing, the inner and outer wheels of the insulated wheels are short-circuited so that the pair of left and right insulated wheels are electrically connected through the axle, the circuit breaker drops, the signal lamp lights up, the warning signal sounds, and the level crossing is in a complete short-circuit state (the same state as when a passenger train passes through the level crossing), and the level crossing is blocked. When staying within the level crossing monitoring area to perform track maintenance work, the insulated wheels are in a partial short-circuit (LPF short-circuit) state so that the circuit breaker drops, the signal lamp lights up, and the warning signal stops sounding. When the track maintenance vehicle does not pass through the level crossing or does not stay within the level crossing monitoring area, the insulated wheels are in a completely insulated state, the signal lamp stops lighting, the circuit breaker rises, and the level crossing can be passed. There are Patent Documents 1 to 4 as devices for switching between these complete short-circuit state, LPF short-circuit state, and completely insulated state.

[0007] The insulation / short-circuit switching devices of Patent Documents 1 and 2 open and close the contacts with the voltage induced by the electromagnetic induction coupling between the primary coil (power transmission coil) equipped on the bogie side and the secondary coil (power reception coil) equipped on the axle side of the inner and outer wheels of the insulated wheels, and switch between the complete short-circuit state (level crossing closed) and the completely insulated state (level crossing passable).

[0008] If the switching device of Patent Documents 1 and 2 is used to achieve a completely insulated state, the warning signal will not sound, so track maintenance work can be carried out near and within the level crossing without disturbing the residents near the level crossing. However, in this state, the circuit breaker of the level crossing does not drop and the signal lamp does not light up, so there is a risk that pedestrians and automobiles may enter the level crossing, which is dangerous. Therefore, when working inside the level crossing, it is not necessary to set it to the complete short-circuit state, but the circuit breaker should drop, the signal lamp should light up, and only the warning signal should not sound.

[0009] The switching device of Patent Document 3 uses the voltage induced by the electromagnetic induction coupling between the power transmission coil installed on the bogie side and the power reception coil installed on the axle side of the insulated wheels to open and close the contacts of the switch of the short-circuit circuit provided between a pair of left and right wheels. When closed, the inner and outer wheels of the insulated wheels are short-circuited and the level crossing becomes the fully short-circuited state. When open, the inner and outer wheels return to the insulated state before short-circuiting and are switched to the fully insulated state. Furthermore, by incorporating a low-pass filter (LPF) into the short-circuit circuit, it is possible to switch and control to a state where the barrier drops and passage is blocked, the indicator light is lit, but the alarm does not sound (referred to as "LPF short-circuit" or "partial short-circuit"). By using this switching device, work inside the level crossing can be performed in a quiet and safe state.

[0010] The switching device of Patent Document 4 is an application filed by the applicant of this application and was not published at the time of this application. Similar to Patent Documents 1 to 3, it can be switched between the fully short-circuited state and the fully insulated state. Furthermore, even if the distance between the bogie and the axle fluctuates, an induced voltage can be surely obtained between the power transmission coil and the power reception coil. However, although it is possible to obtain the power to drive the semiconductor switch, it is difficult to obtain the power to drive the relay switch.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

[0012] The switching device of Patent Documents 1 to 3 uses a method (transformer method) in which the power transmission coil on the bogie side and the power reception coil on the axle side are electromagnetically inductively coupled. Therefore, in order to ensure the electromagnetic inductive coupling between the two coils, the distance (gap) between the two coils must be narrowed. However, the gap between the bogie and the axle of the track maintenance vehicle may roll horizontally in the left-right direction (X-axis direction), move up and down in the vertical direction (Y-axis direction), or change in the depth direction (Z-axis direction) due to running or the slope of the ground (road surface) where the rails are laid. Along with these fluctuations, the distance between the bogie and the axle fluctuates, and the gap between the two coils fluctuates. When it becomes wider, the electromagnetic inductive coupling between the two coils becomes uncertain, and it may not be possible to obtain the necessary induced voltage.

[0013] In order to be able to cope with the distance fluctuations between the bogie and the axle, it is necessary to enable electromagnetic inductive coupling even when the gap between the two coils becomes wider (widen the operating range of the gap), or to mechanically prevent the distance from widening. However, if it is widened, reliable electromagnetic inductive coupling cannot be obtained between the two coils, so there is a limit to widening it. Also, even if the gap is widened, both the power transmission coil and the power reception coil need to be enlarged to operate. A vehicle has a driving axle and a driven axle, and the power reception coil can be attached to either axle. However, since there is a gearbox on the driving axle, there are restrictions on the installation space. For this reason, high precision is required for adjusting the gap between the power transmission coil fixed to the bogie and the power reception coil attached to the axle, making it difficult to set the attachment position of the power reception coil to the axle and making the attachment troublesome.

[0014] In Patent Document 3, since a mechanical contact switch (for example, a relay) is used for the switch of the track maintenance vehicle, a relatively large current is required to drive the relay. Also, there are problems such as the relay contacts deteriorating over time, being unable to open and close quickly and accurately, and causing malfunction.

[0015] Patent Document 4 has no problems like Patent Documents 1 to 3. However, since the number of power transmission coils and power reception coils is large, the assembly is troublesome, and a mechanism is required to prevent the distance between the power transmission and reception coils from fluctuating. As a result, the structure becomes complex, the size increases, and the cost also rises. In addition, there are problems such as the quality and failure rate of the coils, and it is difficult to ensure a stable supply from the market because they are manufactured overseas. Moreover, it only has a power supply capacity sufficient to drive semiconductor switches and cannot obtain the power to drive a mechanical switch such as a relay (hereinafter referred to as a "mechanical switch"). For this reason, there is also a problem that it cannot be used for conventional short-circuit switching devices that use a relay (relay switch) as a short-circuit switching switch.

Summary of the Invention

Problems to be Solved by the Invention

[0016] The problems to be solved by the present invention are to ensure that the power transmission coil on the bogie side and the power reception coil on the axle side are surely electromagnetically inductively coupled to obtain a stable output, and to ensure electromagnetic inductive coupling even if the distance between the power transmission coil on the bogie side and the power reception coil on the axle side fluctuates due to the distance variation between the bogie and the axle (widening the electromagnetic inductive coupling range), and to be able to switch the insulated wheel between complete insulation, complete short circuit, and partial short circuit by a simple method.

Means for Solving the Problems

[0017] [Insulation / Short-circuit Switching Device 1 for Insulated Wheels] One of the features of the insulation / short-circuit switching device for insulated wheels of the present invention is that two power transmission coils are arranged opposite to both outer sides of the power reception coil with a gap therebetween, and the combined voltage of the two power transmission coils (hereinafter referred to as the "combined voltage") is received by the power reception coil without contact through electromagnetic inductive coupling between the two power transmission coils and the power reception coil. As a result, the operating interval of the power transmission and reception coils is widened, and the received voltage is also stabilized. In addition, even if one power transmission coil moves away from the power reception coil, the other power transmission coil approaches the power reception coil to maintain an electromagnetically inductive distance.

[0018] [Insulation / Short-circuit Switching Device 2 for Insulated Wheels] Another feature of the insulation and short - circuit switching device for the insulated wheel of the present invention is that it includes an operation panel, a control panel, a primary - side circuit (power - transmission side circuit), a power - transmission coil provided on the output side thereof, a power - receiving coil that can be electromagnetically inductively coupled with the power - transmission coil, a secondary - side circuit (power - receiving side circuit) provided on the output side of the power - receiving coil, a switch for completely short - circuiting, partially short - circuiting, and completely insulating the insulated wheel, and an LPF. The operation panel can operate the control panel, and the control panel can send the power - supply voltage from the vehicle and the control signals for complete short - circuit, partial short - circuit, and complete insulation to the power - transmission side circuit based on the commands from the operation panel. The power - transmission side circuit can modulate a power - feeding carrier wave with signals of different frequencies based on the commands of the operation panel to generate two or more modulated waves (modulated carrier waves), and send this modulated carrier wave to the power - transmission coil as a control signal. The power - transmission coil and the power - receiving coil can be electromagnetically inductively coupled to wirelessly receive the modulated carrier wave. The power - receiving side circuit includes a power system that rectifies the received modulated carrier wave to extract the power - system voltage and a signal system that demodulates the modulated carrier wave to demodulate the modulation wave into a control signal. Based on the control signal demodulated by the signal system, the switch is opened and closed with the power - system voltage extracted from the power system, so that the insulated wheel can be switched to any of complete short - circuit, partial short - circuit through the LPF, and complete insulation. Also in this case, two power - transmission coils can be arranged on both outer sides of the power - receiving coil so that the combined voltage of the two power - transmission coils can be received by the power - receiving coil in a non - contact manner.

[0019] [Maintenance vehicle] The maintenance vehicle of the present invention is equipped with the above - mentioned insulation and short - circuit switching device. Its features are that it is provided with an operation panel and a control panel on the upper side of the vehicle body, and a power - transmission side circuit, at least two power - transmission coils, one power - receiving coil, a power - receiving side circuit, a switch, and an LPF on the lower side of the vehicle body under the floor. The two power - transmission coils are fixed to the bogie on the lower side of the floor, the power - receiving coil is fixed to the outer periphery of the axle on the lower side of the floor, and the two power - transmission coils are arranged opposite each other with a gap on both outer sides of the power - receiving coil. The power - receiving side circuit and the switch are attached to the insulated wheel, and the LPF is attached to the axle. The power - receiving side circuit and the switch can be mounted in a single box (switch box) and attached to the insulated wheel.

[0020] [Insulation and Short - Circuit Switching Method for Insulated Wheels] The insulation and short - circuit switching method for the insulated wheels of the present invention is a method in which a switch is opened and closed by an induced voltage obtained by electromagnetic induction coupling between a power - transmitting coil and a power - receiving coil, and the insulated wheels can be switched and controlled to be in a state of complete short - circuit, partial short - circuit, or complete insulation. Its characteristics are as follows: A signal (modulating wave) with a different frequency is used to modulate the carrier wave for power supply based on the command of the operation panel to generate two or more modulated carrier waves (control signals). The control signals are sent to the power - transmitting coil, and through the electromagnetic induction coupling between the power - transmitting coil and the power - receiving coil, power is wirelessly received by the power - receiving coil. The received modulated carrier wave is rectified to extract the power - system voltage, the received modulated carrier wave is detected, the modulating wave is demodulated to obtain a control signal, and based on the demodulated control signal, the switch is opened and closed with the previously extracted power - system voltage to switch the insulated wheels to any one of complete short - circuit, partial short - circuit through an LPF, or complete insulation. [Advantages of the Invention]

[0021] The insulation and short - circuit switching device for the insulated wheels of the present invention has the following effects. (1) Since two power - transmitting coils are arranged on both outer sides of the power - receiving coil, the combined voltage of the two power - transmitting coils is received by the power - receiving coil, and a stable voltage can be obtained. (2) Since two power - transmitting coils are arranged on both outer sides of the power - receiving coil, even if the two coils swing laterally due to the lateral swing of the car body and the bogie, and the distance between the power - transmitting coil and the power - receiving coil changes, at least the distance between one of the power - transmitting coils and the power - receiving coil is maintained within a distance where electromagnetic induction coupling is possible, so the electromagnetic induction coupling range becomes wider. (3) The modulated carrier wave (control signal) transmitted from the power - transmitting side circuit is demodulated by the power - receiving side circuit, and the opening and closing of the switch can be controlled based on the control signal, so the configurations of the power - transmitting side circuit and the power - receiving side circuit are simplified.

[0022] The line - maintaining vehicle of the present invention has the following effects. Since the operation panel and the control panel are provided on the vehicle upper side (driver's seat side) and can be operated from the driver's seat, the operation when passing through a level crossing or in bad weather becomes easy.

[0023] The insulation and short - circuit switching method of the insulating wheel of the present invention has the following effects. (1) By modulating the carrier wave of power transmission to obtain a modulated carrier wave, demodulating the modulated carrier wave to obtain a control signal, and controlling the opening and closing of the switch based on the demodulated control signal, it is possible to switch the insulating wheel to complete short - circuit, partial short - circuit, and complete insulation. Therefore, it is a simple switching method. (2) By changing or increasing the modulation frequency, it is possible to send multi - channel (multiple types) of control signals. With a set of transmission and reception coils, the switch can be controlled in a multi - channel manner, enabling miniaturization, weight reduction, improved reliability, and cost reduction.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0025] (Embodiment of the insulation / short-circuit switching device) The insulation / short-circuit switching device of the insulating wheel of the present invention includes, as shown in FIGS. 1(a) and 1(b), a control panel 2 that operates by operating an operation panel 1, a power transmission coil drive circuit (power transmission side circuit) 3, two power transmission coils 4a and 4b, one power receiving coil 5, a power receiving side circuit 6 (FIG. 4(a)), a low-pass filter (LPF) 7, and switches. The switches are composed of two relay switches SW1 and SW2 (FIG. 4(a)) or two semiconductor switches (MOS FETs SW1 and SW2 (FIG. 4(b))). In this embodiment, the two relay switches SW1 and SW2 are collectively, or the two semiconductor switches (MOS FETs SW1 and SW2) are collectively, housed in a switch box 9 (FIGS. 1(a) and 1(b)) together with the power receiving side circuit 6.

[0026] (Embodiment of the line maintenance vehicle) The line maintenance vehicle of the present invention is equipped with the insulation and short - circuit switching device. As an example, in Fig. 1(a), the operation panel 1 and the control panel 2 are arranged on the upper side (driver's seat side) of the vehicle, and the power transmission side circuit 3, two power transmission coils 4a, 4b, one power reception coil 5, LPF 7, and switch box 9 are arranged on the lower side of the vehicle floor. The power transmission side circuit 3 and the two power transmission coils 4 are attached (fixed) to the bogie 10 of the line maintenance vehicle with mounting brackets. The power reception coil 5 and LPF 7 are fixed to the axle A with mounting brackets. The switch box 9 (Figs. 1(a) and 1(b)) in which the power reception side circuit 6 and switches SW1, SW2 are housed is fixed to one of the insulated wheels B. The power reception side circuit 6 and the switches can also be separately fixed to the insulated wheel B.

[0027] [Line maintenance vehicle] The line maintenance vehicle is equipped with existing insulated wheels B. In the insulated wheel B of Fig. 1(a), the inner wheel B1, the outer wheel B2, and the insulating material C are arranged concentrically, and the inner wheel B1 and the outer wheel B2 are insulated by the insulating material C. The two insulated wheels B are connected by the axle A and are in a set (one set), and one set of insulated wheels B is equipped with two or more on the front and rear of the bogie 10 of one line maintenance vehicle. Note that, for the convenience of explanation, Fig. 1(a) shows the insulated wheel horizontally, but the actual insulated wheel faces forward in Fig. 1(a).

[0028] [Example 1 of the operation panel] The two operation panels 1 in Fig. 1(a) are the same and are arranged one by one in the front driver's seat and the rear driver's seat of the vehicle. The operation panel 1 is equipped with an insulation button 1a, a short - circuit button 1b, and an LPF short - circuit button 1c. These buttons 1a - 1c are illuminated push - button types where a lamp lights up when pressed. As an example, when the insulation button 1a is pressed, it lights up blue, when the short - circuit button 1b is pressed, it lights up red, and when the LPF short - circuit button 1c is pressed, it lights up orange. The color of the button and the lighting color can be any different colors. The operation button does not have to be pressed for operation, and other operation methods may also be used.

[0029] The two operation panels 1 in Fig. 1(a) can be set such that the command from the operation panel 1 operated later can operate the control panel 2 prior to the command from the operation panel 1 operated earlier, or such that the control panel 2 can be operated only by the command from either the front driver's seat or the rear driver's seat operation panel 1.

[0030] [Control panel] When any one of the buttons 1a - 1c on the operation panel 1 in Fig. 1(a) is operated, the control panel 2 supplies power to the power transmission side circuit 3 based on that operation from the power supply voltage (vehicle power supply: +24V). Also, it can control to operate either one of the oscillators OSC1 and OSC2 (Fig. 3) in the power transmission side circuit 3 and stop the other, to oscillate a pulse signal from the operating oscillator, or to stop the operation of both oscillators OSC1 and OSC2 so that no pulse signal is oscillated (the pulse signal becomes "0").

[0031] [Power transmission side circuit] The power transmission side circuit 3 in Fig. 1(a) can be configured as shown in Fig. 3. The power transmission side circuit 3 in Fig. 3 can transmit the power supply voltage (+24V) supplied from the control panel 2 and two different control signals of three methods to two power transmission coils 4.

[0032] The power transmission side circuit 3 in Fig. 3 includes a protection circuit 11, a power operation indicator light 12, a stabilized power supply 13, a 3 - terminal regulator 14, a reference voltage, a gate driver 15, switching elements Q1, Q2, three oscillators OSC1, OSC2, OSC3, and a capacitor C1. Two power transmission coils 4a and 4b are connected to the output terminal of the power transmission side circuit 3.

[0033] [Protection circuit, power operation indicator light] The protection circuit 11 protects the power transmission side circuit 3 by cutting off the power transmission system when an overcurrent or overvoltage is supplied from the control panel 2. The power operation indicator light 12 lights up when the power supply voltage (for example, +24V) is supplied from the control panel 2 to the power transmission side circuit 3, indicating that the power is ON.

[0034] [Stabilized power supply, 3 - terminal regulator] The stabilized power supply 13 outputs the power supply voltage (e.g., +24V) supplied from the control panel 2 as +20V. The 3-terminal regulator 14 outputs the +20V voltage output from the stabilized power supply 13 as an internal power supply (e.g., +5V).

[0035] [Gate driver, reference power supply] The gate driver 15 operates when a gate voltage is input from the reference power supply and a modulation carrier wave (as an example, a PWM modulation wave) described later is input from the oscillator OSC3.

[0036] [Switching element] MOS FETs are used for the switching elements Q1 and Q2, and the output signal of the gate driver 15 is supplied to the power transmission coils 4a and 4b.

[0037] [Resonance capacitor] The resonance capacitor C1 is for resonance with the power transmission coils 4a and 4b, is connected to the input side of the power transmission coils 4a and 4b, and performs non-contact electromagnetic resonance coupling in combination with the power transmission coils 4a and 4b.

[0038] [Oscillator] The oscillator OSC1 and the oscillator OSC2 oscillate pulse signals (modulation waves) with different frequencies, and the oscillator OSC3 oscillates a carrier wave. As an example, the oscillator OSC1 oscillates an 800Hz pulse signal (Fig. 5(a)), the oscillator OSC2 oscillates a 1.2kHz pulse signal (Fig. 5(b)), and the oscillator OSC3 oscillates a 150kHz carrier wave (Fig. 5(c)). The oscillators OSC1 and OSC2 oscillate based on a command from the operation panel 1. When OSC1 oscillates, OSC2 stops oscillating, and when OSC2 oscillates, OSC1 stops oscillating. The oscillator OSC3 continues to oscillate when the power supply voltage (+24V) is supplied. The 150kHz carrier wave oscillated from the oscillator OSC3 is PWM-modulated by the 800Hz modulation wave oscillated from the oscillator OSC1 or the 1.2kHz modulation wave oscillated from the oscillator OSC2, and becomes a PWM modulation wave (modulation carrier wave: Fig. 5(d)).

[0039] [Operation of the power transmission side circuit] When any one of the insulation button 1a, short - circuit button 1b, and LPF short - circuit button 1c on the operation panel 1 of the driver's cab is operated, the control panel 2 is operated according to the operated mode (either insulation, short - circuit, or LPF short - circuit), and the power supply voltage (for example, +24V of the vehicle) is fed to the power - transmitting side circuit 3 (Fig. 3) via the control panel 2. The power supply voltage +24V is converted to +20V by the stabilized power supply 13 and then converted to +5V by the three - terminal regulator 14 and output as the internal power supply of the power - transmitting side circuit.

[0040] When the short - circuit button 1b on the operation panel 1 is operated, via the control panel 2, the oscillator OSC1 in the power - transmitting side circuit 3 operates to oscillate a pulse signal of 800Hz (modulation wave 1: Fig. 5(a)), and the 150kHz carrier wave (Fig. 5(c)) oscillated from the oscillator OSC3 is PWM - modulated by the 800Hz modulation wave to generate a PWM - modulated wave (Fig. 5(d)). In this embodiment, this PWM - modulated wave is used as the short - circuit control signal. At this time, the oscillator OSC2 has stopped oscillating.

[0041] When the LPF short - circuit button 1c on the operation panel 1 is operated, via the control panel 2, the oscillator OSC2 operates to oscillate a pulse signal of 1.2kHz (modulation wave 2: Fig. 5(b)), and the 150kHz carrier wave (Fig. 5(c)) oscillated from the oscillator OSC3 is PWM - modulated by the 1.2kHz modulation wave to generate a PWM - modulated wave (Fig. 5(d)). In this embodiment, this PWM - modulated wave is used as the LPF short - circuit control signal. At this time, the oscillator OSC1 has stopped oscillating.

[0042] When the insulation button 1a on the operation panel 1 is operated, neither the oscillator OSC1 nor OSC2 operates via the control panel 2, neither the 800Hz modulation wave 1 (Fig. 5(a)) nor the 1.2kHz modulation wave 2 (Fig. 5(b)) is oscillated, and the oscillation becomes "0". Also, since the modulation signals (800Hz, 1.2kHz) of the 150kHz carrier wave (Fig. 5(c)) oscillated from the oscillator OSC3 have stopped, it becomes an unmodulated signal. In this embodiment, the unmodulated signal is used as the insulation control signal.

[0043] In this embodiment, the control signal is a PWM modulation wave (pulse width modulation wave), but other methods, for example, a PFM modulation wave (pulse frequency modulation wave), other modulation methods, or three or more signals with different frequencies, amplitudes, etc. can be used. The frequencies of the pulse signals oscillated by the oscillators OSC1, OSC2, and OSC3 can also be other frequencies.

[0044] The short - circuit control signal, the LPF short - circuit control signal, and the insulation control signal are input to the gate driver 15. The gate driver 15 operates when a gate voltage and a carrier wave are input from the oscillator OSC3. The switching elements Q1 and Q2 operate based on the output of the gate driver 15, and the PWM modulation wave (Fig. 5(d)) is transmitted to the power transmission coils 4a and 4b. This signal is wirelessly received by the power reception coil 5 through electromagnetic induction coupling.

[0045] [Power transmission coil] The two power transmission coils 4a and 4b in Fig. 1(a) are the same. As an example, as shown in Figs. 7(a) and (b), coils 30a and 30b are provided horizontally in the circumferential direction of the approximately quarter - circular power transmission - side substrate 30. The winding diameters, the number of turns, the winding shapes, etc. of the power transmission coils 4a and 4b can be arbitrarily designed. The shape of the power transmission - side substrate 30 can be other shapes, for example, a semi - circular plate. In this case, the shapes of the coils 30a and 30b are also changed according to the shape of the power transmission - side substrate 30 (to be approximately semi - circular). The power transmission - side substrate 30 is made of insulating resin.

[0046] The power transmission coils 4a and 4b can be provided on both the front and back surfaces of a single power transmission side substrate 30, or only on one side. FIGS. 7(a) and 7(b) show an example of the case where they are provided on both the front and back surfaces of a single power transmission side substrate 30. The front surface side coil 30a provided on the front surface (FIG. 7(a)) and the back surface side coil 30b provided on the back surface (FIG. 7(b)) have the same shape, the same winding diameter, and the same number of turns. The winding end 31b of the front surface side coil 30a (FIG. 7(a)) and the winding start end 31c of the back surface side coil 30b (FIG. 7(b)) are connected (wired) as shown in FIG. 7(c), and the number of turns is twice that of the case where the coil is provided only on one side (either the front or the back) of the power transmission side substrate 30. The winding start end 31a of the front surface side coil 30a (FIG. 7(a)) and the winding end 31d of the back surface side coil 30b (FIG. 7(b)) serve as output terminals.

[0047] The power transmission coils 4a and 4b can be formed by fixing coils 30a and 30b, in which the conducting wire is wound horizontally as shown in FIGS. 7(a) and 7(b), to the power transmission side substrate 30, or by printing on the power transmission side substrate 30.

[0048] [Fixing of Power Transmission Coil] The power transmission coils 4a and 4b in FIGS. 7(a) and 7(b) are connected in series with two pieces, and are fixed to the bogie 10 (FIG. 9) of the catenary vehicle with metal fittings while sandwiching the power reception coil 5 in between and keeping a gap, and are arranged opposite to each other.

[0049] [Power Reception Coil] The power reception coil 5 in FIG. 1(a) is provided horizontally in the circumferential direction of each of two semi-circular plate-shaped power reception side substrates 40 as shown in FIGS. 8(a) and 8(b) to form a substantially semi-circular shape. The winding diameter, the number of turns, the winding shape, the number of pieces, etc. of the power reception coil 5 can also be arbitrarily designed. The power reception side substrate 40 is also made of insulating resin.

[0050] The power reception coil 5 can also be formed by fixing coils 40a and 40b, in which the conducting wire is wound horizontally as shown in FIGS. 8(a) and 8(b), to the power reception side substrate 40, or by printing on the power reception side substrate 40.

[0051] As shown in FIGS. 8(a) and 8(b), the power receiving coil 5 can be provided on both the front and back surfaces of each of the two power receiving side substrates 40. In this case, as shown in FIG. 8(a), the winding end 41b of the front side coil 40a provided on the front surface of the power receiving side substrate 40 and the winding start end 41c of the back side coil 40b provided on the back surface of the power receiving side substrate 40 as shown in FIG. 8(b) are connected (wired) as shown in FIG. 8(c), so that the number of turns can be made twice that in the case where the coil is provided on only one side (front or back) of the power receiving side substrate 40. By providing the power receiving coil 5 on both the front and back surfaces of a single substrate and connecting the coils on the front and back surfaces so that the number of turns increases, it is possible to induce power capable of driving a mechanical switch (relay switch) even with a small power receiving coil.

[0052] [Fixing of Power Receiving Coil] The power receiving coil 5 in FIGS. 8(a) and 8(b) is fixed to the outer periphery of the axle A of the catenary vehicle by combining semi-circular ones into a circular shape. The power receiving coil 5 is fixed with a gap L1, L2 (FIG. 2(a)) having a width capable of electromagnetic induction coupling between the two power transmission coils 4a and 4b.

[0053] When only one of the power transmission coils 4a and 4b is present, the received voltage induced in the power receiving coil 5 is as shown by only 4a or only 4b in FIG. 2(b). However, when the two power transmission coils 4a and 4b are arranged on both outer sides of the power receiving coil 5 as shown in FIG. 2(a) so that the combined voltage of both power transmission coils 4a and 4b is induced in the power receiving coil 5, it becomes the combination of 4a and 4b shown in FIG. 2(b). Therefore, the electromagnetic induction coupling range is wider and a stable output can be obtained compared to the case where there is only one power transmission coil. Also, the output voltage becomes larger than in the case of only one, and moreover, the fluctuation of the voltage value is small, resulting in a stable output. The combined voltage can be obtained by connecting the power transmission coils 4a and 4b in series. The power receiving coil 5 can also be fixed to the outer periphery of the axle A by combining two or more semi-circular ones into a circular shape. In this case, two or more power receiving coils 5 can be connected in series so that the combined output of these coils can be obtained.

[0054] The intervals L1 and L2 (Fig. 2(a)) between the power receiving coil 5 and the power transmitting coils 4a and 4b arranged on both outer sides thereof are designed to be intervals at which the power transmitting coils 4a and 4b and the power receiving coil 5 can surely perform electromagnetic induction coupling and a stable output can be obtained on the power receiving side even when there are fluctuations in the axle and bogie of the catenary maintenance vehicle (fluctuations in the bogie width direction of the rail, vertical fluctuations, and fluctuations in the depth direction (rail longitudinal direction)), and the electromagnetic induction coupling range is widened.

[0055] [Power receiving side circuit] The power receiving side circuit 6 in Fig. 1(b) can have the configuration shown in Figs. 4(a) and (b). The power receiving side circuit 6 is connected to the output side of the power receiving coil 5 that performs electromagnetic induction coupling with the power transmitting coils 4a and 4b via a resonance capacitor C2. The resonance capacitor C2 is for resonance with the power receiving coil 5 and, in combination with the power receiving coil 5, performs efficient electromagnetic field resonance coupling in a non-contact manner.

[0056] The power receiving side circuit 6 in Fig. 4(a) includes a bridge rectifier circuit 21 that rectifies the PWM modulation wave wirelessly received by the power receiving coil 5 through electromagnetic induction coupling with the power transmitting coils 4a and 4b, a power receiving voltage stabilization circuit 22, and a three-terminal regulator 23.

[0057] The power receiving voltage stabilization circuit 22 converts the voltage that changes due to the relative position fluctuations between the power transmitting coils 4a and 4b and the power receiving coil 5 into a stable voltage (for example, +12V) and outputs it. This voltage (+12V) is the output of the power system used for driving the relay switches SW1 and SW2 and others.

[0058] The three-terminal regulator 23 converts the output voltage from the power receiving voltage stabilization circuit 22 into an internal power supply (for example, +5V) and outputs it. This internal power supply (+5V) is used for driving the tone decoders 28a and 28b and other devices.

[0059] The power receiving circuit 6 in Fig. 4(a) includes a detection circuit 24, a high-pass filter (HPF) 25, a low-pass filter (LPF) 26, a comparator 27, two tone decoders 28a, 28b, and relay switches SW1 and SW2. This power receiving circuit 6 demodulates the modulated wave from the PWM-modulated carrier wave received by the power receiving coil 5, and closes (turns ON) the short-circuit switch or the LPF short-circuit switch according to the obtained control signal.

[0060] [Tone Decoder] Figs. 4(a) and (b) show a tone decoder 28a for 800 Hz and a tone decoder 28b for 1.2 kHz. When a signal with a frequency of 800 Hz ± 10% is input to the 800-Hz tone decoder 28a from the comparator 27, it demodulates and outputs an 800-Hz signal (control signal for short circuit). When a signal with a frequency of 1.2 kHz ± 10% is input to the 1.2-kHz tone decoder 28b from the comparator 27, it demodulates and outputs a 1.2-kHz signal (control signal for LPF). When the control signal is unmodulated, no control signal is input to either of the 800-Hz and 1.2-kHz tone decoders 28a and 28b, and there is no output. In this case, it is determined as an insulation control signal. That is, three types of control signals are discriminated.

[0061] [Operation of Power Receiving Circuit] The power receiving circuit 6 rectifies the PWM-modulated wave wirelessly received by the power receiving coil 5 (Fig. 4(a)) with a rectifier circuit (Fig. 4(a)), creates a +12V power system voltage through the power receiving voltage stabilization circuit 22 (Fig. 4(a)), and at the same time, detects (half-wave rectifies) the PWM-modulated wave with the detection circuit 24 (Fig. 6(b)), cuts off the DC fluctuation component through the HPF 25, allows high frequencies to pass through (Fig. 6(c)), allows low frequencies to pass through the LPF 26 (Fig. 6(d)), and obtains a demodulated signal (Fig. 6(e)) through the comparator 27. This demodulation method is the same whether it is a modulated wave of 800 Hz or 1.2 kHz.

[0062] (Embodiment of Insulation and Short-Circuit Switching Method) The insulation and short - circuit switching method of the insulating wheels of the present invention will be described below. The following description is about the case where, among the left and right insulating wheels B equipped on a single axle A (Fig. 1(a)), the outer wheel B2 and the inner wheel B1 of one right insulating wheel B are always short - circuited, and the outer wheel B2 and the inner wheel B1 of the other left insulating wheel B are insulated and short - circuited to switch the circuit breaker, indicator light, and alarm of the level crossing to the above - mentioned fully short - circuited state, fully insulated state, and partially short - circuited state. Depending on the vehicle, both insulating wheels B may be of the switching type.

[0063] [Fully short - circuited state] When the short - circuit button 1b of the control panel 1 is operated, a modulated wave of 800 Hz is oscillated from the oscillator OSC1 of the power - feeding side circuit 3 (Fig. 3), and the 150 kHz carrier wave oscillated from the oscillator OSC3 is PWM - modulated. This PWM - modulated wave is sent from the power - feeding side circuit 3 to the power - feeding coils 4a, 4b, and is wirelessly received by the power - receiving side circuit 6 (Fig. 4(a)) through the electromagnetic induction coupling between the power - feeding coils 4a, 4b and the power - receiving coil 5. When an 800 - Hz control signal for short - circuiting is input to the tone decoder 28a, the output from the tone decoder 28a is input to the relay switch SW1. As a result, the relay switch SW1 is driven by the power - system output voltage (+12V) wirelessly received by the power - receiving side circuit 6 to be closed (ON), the inner wheel B1 and the outer wheel B2 of the insulating wheel B are short - circuited to enter the fully short - circuited state, and a low - frequency signal for the circuit breaker and indicator light and a high - frequency signal for the alarm flow through the left and right insulating wheels B, the circuit breaker drops, the indicator light lights up, the alarm sounds, and the level crossing is blocked.

[0064] When the LPF short - circuit button 1c on the operation panel 1 is operated, a modulation wave of 1.2 kHz is oscillated from the oscillator OSC2 of the power - transmission - side circuit 3 (Fig. 3), and the 150 - kHz carrier wave oscillated from OSC3 is PWM - modulated. This PWM - modulated wave is sent from the power - transmission - side circuit 3 to the power - transmission coil 4. When wireless power reception is performed on the power - reception - side circuit 6 (Fig. 4(a)) by electromagnetic induction coupling between the power - transmission coils 4a, 4b and the power - reception coil 5, a 1.2 - kHz control signal for short - circuit is input to the tone decoder 28b, and the output from the tone decoder 28b is input to the relay switch SW2. As a result, the relay switch SW2 is driven by the power - system output voltage (+12V) wirelessly received by the power - reception - side circuit 6 and becomes closed (ON), and the inner wheel B1 and the outer wheel B2 of the insulated wheel B are short - circuited through the LPF7 to enter a partial - short - circuit state. At this time, the low - frequency signal for the circuit breaker and the indicator lamp flowing through the track passes through the LPF7 and flows between the left and right insulated wheels B, but the high - frequency signal for the alarm is cut off by the LPF7 and does not flow between the left and right insulated wheels B. Therefore, the circuit breaker drops, the indicator lamp lights up, but the alarm does not sound, and a state of stopping traffic is achieved, and the maintenance work inside the level crossing can be carried out in a quiet state.

[0065] When the insulation button 1a on the operation panel 1 is operated, the oscillation of the modulation wave stops in both the oscillators OSC1 and OSC2 of the power - transmission - side circuit 3 (Fig. 3), and the 150 - kHz carrier wave oscillated from OSC3 becomes unmodulated. At this time, no signal is input to either the 800 - Hz tone decoder 28a or the 1.2 - kHz tone decoder 28b, so there is no output from either tone decoder 28a or 28b. For this reason, both the relay switches SW1 and SW2 become open (OFF), and the inner wheel B1 and the outer wheel B2 of the insulated wheel B remain in the insulated state before short - circuit (complete - insulation state). Neither the signal for the circuit breaker and the indicator lamp flowing through the track nor the signal for the alarm flows between the left and right insulated wheels B. The circuit breaker rises, the indicator lamp goes out, the alarm stops, and the level crossing becomes passable.

[0066] The relay switch SW1 and the relay switch SW2 are configured so that they do not turn on simultaneously.

[0067] [Example 2 of the operation panel] Some of the specifications of the orderer require that only one operation panel be provided in the driver's seat and that the operation panel can only be operated from the driver's seat. The operation panel 1 in Fig. 9 meets this specification. The operation panel 1 is divided into one operation unit 60 and two display units 60a and 60b. One operation unit 60 is arranged only in either the front part or the rear part of the driver's seat in the vehicle so that it can only be operated from the arranged driver's seat. The two display units 60a and 60b are arranged in the front part and the rear part of the driver's seat respectively so that the operation status of the operation unit 60 can be confirmed from both the front part and the rear part of the driver's seat. For the convenience of explanation, Fig. 9 shows the insulating wheels B lying sideways.

[0068] The operation panel 1 in Fig. 1(a) is a push-button type, and the operation unit 60 of the operation panel 1 in Fig. 9 is a toggle switch. By turning the toggle switch 61, it can be switched to three positions: insulation, short circuit, and LPF short circuit. Also, according to the switched positions (insulation, short circuit, LPF short circuit), the display lamps (insulation lamp, short circuit lamp, LPF short circuit lamp) of the display units 60a and 60b are lit. It is desirable that these display lamps light in different colors for easy visual discrimination.

[0069] [Another example of the switch] The switches in Fig. 4(a) are relay switches SW1 and SW2, but the switch in the present invention may be a semiconductor switch (electronic switch). Fig. 4(b) is an example when a MOS FET is used as the electronic switch. In the case of an electronic switch, the output from the tone decoder 28a for 800 Hz is input to the MOS FET SW1, and the insulating wheels B are brought into a complete short-circuit state with that output. The output from the tone decoder 28b for 1.2 kHz is input to the MOS FET SW2 via the photovol 29 (Fig. 4(b)), and the output from the MOS FET SW2 is supplied to the insulating wheels B via the LPF 7 (Fig. 4(a)(b)) to bring the insulating wheels B into a partial short-circuit state. Also, when there is no output from either the tone decoder 28a for 800 Hz or the tone decoder 28b for 1.2 kHz, the insulating wheels B are in a complete insulation state. All operations are the same as in the case of relay switches.

[0070] In the present invention, either a relay switch or a semiconductor switch can be used. However, when it comes to practical implementation, one of the two methods will be specified at the time of order.

[0071] As shown in Fig. 1(a), the relay switches SW1 and SW2 or the semiconductor switches MOS FET SW1 and SW2 (Fig. 1(b)) in the switch box 9 attached to the wheel B are connected to the LPF 7 attached to the axle A by the cable 50. Also, the switch needs to be connected to the cable 51 that shorts the insulated wheel B. Since the maximum value of the current flowing through the cables 50 and 51 during short circuit is as large as about 30 A, it is necessary to use thick and short cables. When the cable becomes thick, its rigidity increases, and the workability such as routing becomes poor. In Fig. 1(a), the relay switches SW1 and SW2 or the semiconductor switches MOS FET SW1 and SW2 together with the power receiving side circuit 6 are grouped in the switch box 9 (Fig. 1(b)) and attached (externally attached) to one of the insulated wheels B (Fig. 1(a)), thereby shortening the cables 50 and 51 and making the work easier.

[0072] (Other Embodiments) Since the above embodiment is merely an example of the present invention, the configurations of the power transmission side circuit and the power receiving side circuit, the operations of those circuits, the modulation method of the carrier wave, the attachment structure of the insulation / short circuit switching device to the carriage and the axle, etc. are not limited to this embodiment, and various modifications and changes are possible without departing from the gist of the present invention as long as the problems to be solved can be solved.

[0073] In the above embodiment, one of the left and right insulated wheels is always short-circuited (Fig. 1(a)), and the other is switched and controlled by the insulation / short circuit switching device of the present invention. However, both insulated wheels can also be switched and controlled by the insulation / short circuit switching device of the present invention.

[0074] The shape, number of sheets, number of turns of the power transmission coil, the shape, number of sheets, number of turns of the power receiving coil, etc. can also be other shapes, numbers of sheets, and numbers of turns.

[0075] The above description is about the insulation and short - circuit switching device of the insulating wheel of the present invention when it is equipped on a single vehicle. However, the insulation and short - circuit switching device of the insulating wheel of the present invention can also be equipped on other vehicles when two or more vehicles are connected. In that case, as shown in Fig. 1(a) and Fig. 9, for other vehicles, devices and circuits similar to the power transmission side circuit 3, power transmission coils 4a, 4b, power reception coil 5, power reception side circuit 6, switches SW1, SW2, LPF7, switch box 9, etc. of the above - mentioned embodiment are prepared and equipped on the other vehicles. In this case, the operation panel 1 and the control panel 2 can be shared with those in Fig. 1(a) and Fig. 9, or those for other vehicles can be prepared separately.

Explanation of Signs

[0076] 1 Operation panel 1a Insulation button 1b Short - circuit button 1c LPF short - circuit button 2 Control panel 3 Power transmission side circuit 4a, 4b Power transmission coils 5 Power reception coil 6 Power reception side circuit 7 Low - pass filter (LPF) 9 Switch box 10 Bogie 11 Protection circuit 12 Power supply operation indicator lamp 13 Stabilized power supply 14 3 - terminal regulator 15 Gate driver 21 Bridge rectifier circuit 22 Power reception voltage stabilization circuit 23 3 - terminal regulator 24 Detection circuit 25 HPF 26 LPF 27 Comparator 28a, 28b Tone decoder 29 Photovoltaic cell 30 Power transmission side substrate 30a (On the power transmission side substrate) Surface - side coil (power transmission coil) Back-side coil (power transmission coil) of 30b (power transmission-side substrate) Starting end of winding of 31a (surface-side coil of power transmission-side substrate) (power transmission coil) End of winding of 31b (surface-side coil of power transmission-side substrate) (power transmission coil) Starting end of winding of 31c (back-side coil of power transmission-side substrate) (power transmission coil) End of winding of 31d (back-side coil of power transmission-side substrate) (power transmission coil) 40 Power reception-side substrate Surface-side coil (power reception coil) of 40a (power reception-side substrate) Back-side coil (power reception coil) of 40b (power reception-side substrate) Starting end of winding of 41a (surface-side coil of power reception-side substrate) (power reception coil) End of winding of 41b (surface-side coil of power reception-side substrate) (power reception coil) Starting end of winding of 41c (back-side coil of power reception-side substrate) (power reception coil) End of winding of 41d (back-side coil of power reception-side substrate) (power reception coil) 50, 51 Cables 60 Operation unit 60a, 60b Display units 61 Switching switch A Axle B Insulated wheel B1 Inner wheel B2 Outer wheel C Insulating material C1, C2 Resonance capacitors Gap (spacing) between L1, L2 power transmission coil and power reception coil MOS FET SW1, SW2 Semiconductor switches OSC1, OSC2 (Pulse wave (modulated wave)) oscillators OSC3 (Carrier wave) oscillator Q1, Q2 Switching elements SW1, SW2 Relay switches

Claims

1. In an insulation / short-circuit switching device for an insulated wheel, a switch is opened and closed by a voltage induced by electromagnetic induction coupling between a power transmission coil and a power reception coil, so that the inner and outer wheels of the insulated wheel can be switched between a complete short circuit, complete insulation, and a partial short circuit. When a complete short circuit occurs, a circuit breaker drops, an indicator light lights up, and an alarm sounds. When in complete insulation, the circuit breaker does not drop, the indicator light does not light up, and the alarm does not sound. When a partial short circuit occurs, the circuit breaker drops and the indicator light lights up, but the alarm does not sound. A power transmission coil is disposed opposite to both outer sides of the power reception coil with a gap therebetween. The combined voltage of both power transmission coils can non-contactingly supply power to the power reception coil by electromagnetic induction coupling. An insulation / short-circuit switching device for an insulated wheel, characterized by the above.

2. In the insulation / short-circuit switching device for an insulated wheel according to Claim 1, the insulation / short-circuit switching device for an insulated wheel includes an operation panel, a control panel, a power transmission side circuit, a power transmission coil, a power reception coil, a power reception side circuit, a switch for short-circuiting / insulating the insulated wheel, and a low-pass filter (LPF). The operation panel can operate the control panel. The control panel can supply the power supply voltage from the vehicle to the power transmission side circuit, and can control the operation of the power transmission side circuit by switching the oscillation of the modulation wave based on a command from the operation panel. The power transmission side circuit transmits the power supply voltage to the power transmission coil, and can generate a modulated carrier wave (control signal) by modulating a carrier wave with two or more modulation waves having different frequencies oscillated based on a command from the operation panel, and supply the control signal to the power transmission coil. The power reception coil can be electromagnetically inductively coupled with the power transmission coil to induce a voltage associated with the combined voltage of the two power transmission coils. The power reception side circuit rectifies the received modulated carrier wave to extract the power system voltage, demodulates the modulated carrier wave, demodulates the modulation wave to discriminate a control signal for complete short circuit, a control signal for partial short circuit, and a control signal for insulation, and operates the switch with the power system voltage based on the discriminated control signal to switch and control the inner and outer wheels of the insulated wheel between a complete short circuit, a partial short circuit driven through the LPF, and complete insulation. An insulation / short-circuit switching device for an insulated wheel, characterized by the above.

3. In the insulation / short-circuit switching device for an insulated wheel according to Claim 2, the modulation of the carrier wave by the modulation wave is PWM modulation. An insulation / short-circuit switching device for an insulated wheel, characterized by the above.

4. In the insulation / short-circuit switching device for an insulated wheel according to any one of Claims 1 to 3, The power transmission coil and the power reception coil are horizontally long in the circumferential direction of the axle. An insulation / short-circuit switching device for an insulated wheel, characterized by this.

5. In the insulation / short-circuit switching device for an insulated wheel according to any one of Claims 1 to 4, the power transmission coil is printed on both the front and back surfaces or either one of the surfaces of the power transmission side substrate, and the power reception coil is printed on both the front and back surfaces or either one of the surfaces of the power reception side substrate. In the case of coils printed on both the front and back surfaces, they are connected so that the number of turns increases. An insulation / short-circuit switching device for an insulated wheel, characterized by this.

6. In the insulation / short-circuit switching device for an insulated wheel according to any one of Claims 1 to 5, the power transmission coil is fixed to both the front and back surfaces or either one of the surfaces of the power transmission side substrate with a coil wound with a conductor, and the power reception coil is fixed to both the front and back surfaces or either one of the surfaces of the power reception side substrate. In the case of coils fixed to both the front and back surfaces, they are connected so that the number of turns increases. An insulation / short-circuit switching device for an insulated wheel, characterized by this.

7. In the insulation / short-circuit switching device for an insulated wheel according to any one of Claims 1 to 6, the power transmission coil and the power reception coil can be coupled by electromagnetic field resonance. An insulation / short-circuit switching device for an insulated wheel, characterized by this.

8. In the insulation / short-circuit switching device for an insulated wheel according to any one of Claims 1 to 7, the power reception side circuit and the switch are equipped in a switch box. An insulation / short-circuit switching device for an insulated wheel, characterized by this.

9. A line maintenance vehicle equipped with an insulation / short-circuit switching device for an insulated wheel, the insulation / short-circuit switching device is the insulation / short-circuit switching device for an insulated wheel according to any one of Claims 2 to 8, the vehicle is equipped with an operation panel and a control panel on the upper side of the vehicle, the vehicle is equipped with a power transmission side circuit, at least two power transmission coils, one or more power reception coils, a power reception side circuit, a switch for short-circuiting / insulating the insulated wheel, and a low-pass filter (LPF) on the lower side of the vehicle floor, the two power transmission coils are attached to the bogie, the power reception coil is attached in a disc shape to the outer circumference of the axle, the two power transmission coils are arranged opposite to each other with an electromagnetically inductive interval on both outer sides of the power reception coil, and the combined voltage of the voltages supplied to the two power transmission coils is received by the power reception coil non-contact by electromagnetic induction coupling with the power reception coil, the power reception side circuit and the switch are attached to the insulated wheel, and the LPF is attached to the axle. A line maintenance vehicle, characterized by this.

10. In the line maintenance vehicle according to Claim 9, The receiving-side circuit and the switch are individually or combined into one switch box and attached to an insulating wheel. This is a line maintenance vehicle characterized by this.

11. In the line maintenance vehicle according to Claim 9 or Claim 10, An operation panel is arranged one by one in the front driver's seat and the rear driver's seat of the vehicle, and commands from the operation panel operated later can give priority to commands from the operation panel operated earlier to operate the control panel. This is a line maintenance vehicle characterized by this.

12. In the line maintenance vehicle according to any one of Claims 9 to 11, The operation panel is arranged only in either the front driver's seat or the rear driver's seat of the vehicle, and the control panel can be operated only by that operation panel. This is a line maintenance vehicle characterized by this.

13. In the line maintenance vehicle according to any one of Claims 10 to 12, The switch box is arranged near the axle or the insulating wheel and is connected to the insulating wheel by a cable. This is a line maintenance vehicle characterized by this.

14. The switch is opened and closed by the induced voltage due to the electromagnetic induction coupling between the power transmission coil and the power reception coil, and the inner and outer wheels of the insulating wheel are switched to complete short circuit, partial short circuit, and complete insulation. When in complete short circuit, the circuit breaker drops, the indicator light lights up, and the alarm sounds. When in partial short circuit, the circuit breaker drops and the indicator light lights up but the alarm does not sound. When in complete insulation, the circuit breaker does not drop, the indicator light does not light up, and the alarm does not sound. This is an insulation / short circuit switching method for an insulating wheel. When two or more PWM modulated waves modulated by two or more modulation waves with different frequencies are transmitted from the power transmission side circuit to the power transmission coil, the PWM modulated waves are wirelessly received by the power reception coil due to electromagnetic induction coupling. The power reception side circuit can rectify the received PWM modulated waves to extract the power system voltage, detect the PWM modulated waves, demodulate the modulation waves to generate a control signal for complete short circuit, a control signal for partial short circuit, and a control signal for insulation. According to these control signals, the switch is opened and closed by the received power system voltage, and the inner and outer wheels of the insulating wheel are switched to complete short circuit, partial short circuit, and complete insulation. This is an insulation / short circuit switching method for an insulating wheel characterized by this.

15. In the insulation / short circuit switching method for an insulating wheel according to Claim 14, When the control signal transmitted from the power transmission side circuit is switched according to a command from the operation panel, the control signal received by the power reception side circuit is automatically switched. A method for insulating and short-circuit switching of an insulating wheel, characterized by the above.

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