JPH0145202Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for detecting the speed, running position, and relative position of a vehicle in a floating railway using an AC feeding detection coil installed on the vehicle so as to face a ground coil. .

Conventionally, the vehicle speed, running position, and relative position of floating railways have been determined by continuously attaching reflectors or light-shielding plates at regular intervals on the track side, and emitting and receiving light from light emitters and receivers installed on the vehicle side. The reflection from the reflector or the light shielding from the light shielding plate changes intermittently as the vehicle travels, and detection is performed by calculation from the cycle and the installation interval of the reflective plate or the light shielding plate.

This method has the drawback of requiring large construction and maintenance costs because it requires the installation of many reflectors or light shielding plates on the track side in order to detect the position and speed of the vehicle.

The present invention provides a device for detecting vehicle speed, running position, and relative position between the vehicle and the ground coil, which does not compensate for the above-mentioned drawbacks and eliminates the need for ground equipment for detection.

Hereinafter, embodiments of the present invention will be explained in detail with reference to FIGS. 1 and 2.

Figure 1 is a block diagram showing the configuration of the present invention;
The figure is an explanatory diagram showing a change in the impedance of the detection coil facing the ground coil.

In the figure, 1 is a detection coil, 2 is a ground coil (levitation coil and propulsion guide coil), 3 is an AC power source, 4 is a measurement unit that measures the impedance of the detection coil 1, its period, and the number of pulses, and 5 is a calculation unit. Department.

The speed/position detection device of the present invention includes a detection coil 1 connected to an AC power source 3, an impedance value that changes for each ground coil pitch of the detection coil 1, and a measurement method that measures the period of the impedance waveform and the number of periodic pulses from this value. It consists of a section 4 and a calculation section 5 which outputs the speed of the vehicle, the running position, and the relative position between the vehicle and the ground coil by applying predetermined operations to each measurement value measured by the measuring section 4, respectively.

That is, the detection coil 1 faces either the levitation coil or the propulsion guide coil that constitute the ground coil 2 laid at equal pitches on the orbit, and is connected to an AC power source 3 of a predetermined frequency. has been done.

Therefore, the detection coil 1 powered by the AC power source 3 is coupled to the ground coil 2 in a non-contact manner by electromagnetic induction, and the impedance of the detection coil 1 is expressed as shown in equation (1).

Z・=Z・₁ −(Z・² _n /Z・₂ ) ...(1) However, Z・: Impedance of detection coil 1 Z・₁ : Impedance of detection coil 1 when mutual induction is not included Z・₂ : Impedance of ground coil 2 Z・_n : Mutual impedance Here, mutual impedance Z・_n in equation (1)
varies depending on the facing position of the detection coil 1 and the ground coil 2. As a result, the impedance of the sensing coil 1 becomes the minimum when the centers of the sensing coil 1 and the ground coil 2 coincide, as shown in Fig. 2, and the impedance of the sensing coil 1 is shown by the dotted line.
It becomes maximum when the detection coil 1 is located between adjacent ground coils 2 as shown in FIG. Therefore, the impedance of the detection coil 1 repeats the same change for each ground coil pitch depending on the position facing the ground coil 2.

The measurement unit 4 includes a voltmeter, a frequency meter, a pulse counter, etc., and measures the period of the waveform and the number of periodic pulses from the repeatedly changing impedance value of the detection coil 1 and the impedance waveform formed by the impedance value.

The calculation unit 5 includes a division unit that divides the ground coil pitch P by the cycle τ measured by the measurement unit 4 to output the vehicle speed P/τ, and a division unit that outputs the vehicle speed P/τ by dividing the ground coil pitch P by the period τ measured by the measurement unit 4. Since the relationship between the relative position of the ground coil 2 facing the detection coil 1 and the impedance value of the detection coil 1 is known in advance, the relationship between the impedance value of the detection coil 1 is converted from the impedance value to the relative position. and a second arithmetic unit having a conversion unit that outputs the result.

In the above configuration, when the AC power supply 3 is applied to the detection coil 1, the measurement unit 4 determines the period τ and the number of periodic pulses n from the impedance waveform of the detection coil 1.
Extract. Next, the calculation unit 5 can detect the vehicle speed P/τ by multiplying the reciprocal of the period τ by the ground coil pitch P. Furthermore, by multiplying the number of periodic pulses n by the ground coil pitch p, the vehicle traveling distance n·p can be detected.

On the other hand, in order to detect the relative position between the vehicle and the ground coil 2, which is necessary to synchronize the propulsion guide coil and the on-vehicle field coil (superconducting magnet), the impedance value measured by the measurement unit 4 is used in the calculation unit 5. It can be detected by converting to the above-mentioned relative position. moreover,
The detection result of this relative position is transmitted to a linear synchronous motor synchronization control section (not shown), and the linear synchronous motor can be operated in a synchronized state.

Note that by combining several detection coils 1 mounted on the vehicle, it is possible to increase the detection accuracy of the vehicle speed, position, and relative position.

As explained in the above embodiment, the magnetic levitation vehicle speed/position detection device according to the present invention utilizes ground coils, which have been installed in large numbers on orbits conventionally used for vehicle position detection. No equipment is required, and the benefits of being able to omit construction and maintenance costs are extremely large.

In addition, in terms of functionality, the vehicle speed, running position, and relative position can be maintained under all conditions, including not only at low speeds, but also at high speeds, when the vehicle is stopped, and in the event of a failure of the ground drive propulsion guide coil power supply or power outage. Detection is possible.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention;
The figure is an explanatory diagram showing a change in the impedance of the detection coil facing the ground coil in the present invention. 1...Detection coil, 2...Ground coil, 3...
AC power supply, 4... measurement section, 5... calculation section.

Claims (1)

[Scope of utility model registration request] In a levitation vehicle that travels along ground coils (levitation coils and propulsion and guidance coils) laid in equally spaced coil pitches on the track, an alternating current of a predetermined frequency is placed opposite to one of the above ground coils. Detecting a detection coil connected to a power source and an impedance value of the detection coil that changes with each pitch of the ground coil as the detection coil moves over the ground coil as the vehicle runs,
a measuring unit that measures the period of the waveform and the number of periodic pulses from the impedance waveform formed by the impedance value; and a pitch of a ground coil facing the detection coil based on the reciprocal of the period and the number of periodic pulses obtained from the measuring unit. The first calculation unit outputs the speed and traveling position of the vehicle by multiplying the above impedance values, and calculates the relative relationship between the vehicle and the ground coil necessary for synchronous control of the linear synchronous motor that provides the vehicle's propulsion force from the above impedance value. 2nd to output the position
A speed/position detecting device for a magnetically levitated vehicle, the vehicle being equipped with a calculation unit.