JPS61142905A - Levitation controller of magnetic attraction levitating train - Google Patents

Abstract

PURPOSE:To prevent the abnormal operation of a levitating magnet by switching a signal fed back to a controller of a levitation magnet by the output signal of a rail seam detecting sensor to either first or second sensor. CONSTITUTION:Gap detecting sensors 3, 3' are disposed by displacing them at the positions toward the traveling direction of a body. A levitation control is performed by the output signal of the sensor 3' until a proximity switch 7 arrives at a rail seam. When the switch 7 detects the seam of rail, a flip-flip 9 is set, and the control signal of a magnet is switched from the sensor 3' to the sensor 3. When passed through the seam so that the switch 7 is opened, the flip-flop 9 is reset, and the control signal is switched from the sensor 3 to the sensor 3'. Thus, a stable levitation control can be executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a levitation control device for a magnetic attraction levitation type traveling vehicle, such as a railway vehicle or a conveyance table on an article conveyance line, and in particular, to control the influence of rail joints. This invention relates to a highly reliable levitation control device that eliminates levitation.

[Conventional technology]

In magnetic attraction railways that utilize the attraction force of electromagnets to iron rails, a levitation control device is used to prevent mutual contact between the levitation magnets and the iron rails and to stabilize the running of the car body. Figure 4 shows the basic configuration of the device.

Reference numeral 1 in the figure is an iron rail installed on the ground. The gap G between the rail and the levitation magnet 2 is detected by a gap sensor 3 installed on the vehicle body, and the feedback signal from it is sent to i-/jA-・Arithmetic processing is performed using the power amplifier m, m, l*4, and this is amplified by the power amplifier 5 and the magnet 2
The current is controlled to keep the gap G constant. As signals used for control, in addition to the gap signal, an acceleration signal from the acceleration sensor 6, a current signal from the magnet 2, etc. may be used in combination.

[Problem that the invention seeks to solve]

The above-mentioned levitation control device can be expected to provide stable control in areas where the iron rail has no joints. However, at the rail joint, the gap sensor detects the gap A between the rails as shown in Figure 5, so its output signal increases in a pulse-like manner as shown in the figure, and as a result, the attraction force of the levitation magnet increases momentarily. The control circuit determines that the gap has widened and increases the current in the levitation magnet more than necessary, bringing the magnet closer to the iron rail. On the other hand, when the gap sensor returns to a place where there is no rail joint, the control circuit determines that the gap has become narrower and moves away to lower the current of the levitation magnet more than necessary, causing the car body to vibrate up and down, resulting in a worsening of ride comfort. There are drawbacks. The same can be said not only for railways but also for goods transportation lines etc. that apply the same principle.

[Means for solving problems]

Therefore, in order to solve the above-mentioned problem, the present invention provides a levitation control device that uses at least a feedback signal from a gap sensor for levitation control, in which a sensor for gap detection is arranged in front or behind the first sensor in the direction of movement. The rail joint detection switch is composed of two sensors, a common second sensor, and the joint detection signal of the proximity switch switches the feedback signal to the magnet control circuit from the second sensor to the first sensor, and the joint passage signal of the switch is used to switch the feedback signal to the magnet control circuit from the second sensor to the first sensor. It was arranged to return from the first sensor to the second sensor.

In this way, the influence of the pulsed output of the gap sensor can be avoided without interrupting the detection of the gap between the rail and the rail, and the reliability of the levitation control is increased.

〔Example〕

Embodiments of the present invention are shown in the attached FIGS. 1 to 3.

1 and 2, reference numeral 1 indicates the iron rail, 2 indicates the floating magnet, 3 indicates the first sensor that detects the gap between the iron rail and the main body, and 3' indicates the direction of movement of the main body (forward or forward direction) with respect to the first sensor. 4 is a control circuit for the floating magnet 2, 5 is a power amplifier, 6 is an acceleration sensor, and as shown in the figure, the mounting point of the second sensor 3' is Proximity switches 7 are installed side by side. Further, a circuit 9 is inserted in the signal feedback circuit 8 of the first and second sensors to switch the gap signal input to the control circuit 4 to either the first sensor or the second sensor based on the ON/OFF signal of the proximity switch. There is.

This switching circuit 9 may have a configuration as shown in FIG. 3, for example. In the illustrated circuit, an FF (flip-flop) circuit 1° is provided at the output part of the proximity switch 7;
Transistors 11-1 and 11-2 are inserted into the feedback circuits of the sensor and the second sensor, respectively, and in the reset state, the output on the Q side of the FF circuit 10 is large and the output on the Q side is small. is ON, 11-2 is OFF
-t' The output signal of the second sensor 3' is taken into the control circuit 4.

Next, the above-mentioned reset state is maintained until the proximity switch 7 reaches the rail joint, and the floating control is performed using the output signal of the second sensor. However, when the switch 7 detects the rail joint, the output is The FF circuit 10 is set so that Q is a large output, ζ is an output part, and a transistor 11-1
, OFF, 11-2 is turned ON, and the control signal of the magnet is switched from the second sensor 3'' to the first sensor 3.Furthermore, when the switch 7 is turned OFF after passing through the rail joint, the FF circuit 10 is turned OFF. Returning to the reset state, the control signal is switched from the first sensor 3 to the second sensor 3'.

Therefore, the rail joint detection signals from the first and second sensors do not affect the levitation control, making stable levitation control possible.

〔effect〕

As described above, according to the present invention, the signal fed back to the control circuit of the levitation magnet by the output signal of the rail joint detection sensor is switched to either the first sensor or the second sensor,
Since the pulse outputs of these sensors when the vehicle passes through the joint are excluded from the levitation control, abnormal movement of the levitation magnet is prevented and stable running of the vehicle body is guaranteed.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of the levitation control device of the present invention, Fig. 2 is a plan view showing a part thereof, Fig. 3 is a circuit diagram of a specific example of a switching circuit, and Fig. 4 is a conventional levitation control device. FIG. 5, a block diagram of the control device, is a diagram showing the output state of the gap sensor of the device when the device passes through a seam. 1... Iron rail, 2... Levitation magnet, 3...
・First gap sensor, 3'... Second gap sensor, 4... Magnet control circuit, 5... Power amplifier,
7... Proximity switch, 9... Switching circuit, 10...
・FF circuit, 11-1, 12...2... Transistor Patent applicant Sumitomo Electric Industries Co., Ltd. Agent Kama 1) Text 2 Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a levitation control device for a magnetic attraction levitation vehicle, which maintains the gap constant by feeding back a gap detection signal between at least the iron rail and the levitation magnet to a control circuit of the levitation magnet, a gap sensor is provided. 2 of the 2nd sensor which shares the detection switch of the rail joint arranged in front or behind the direction of movement of the 1st sensor.
A signal feedback circuit from the two sensors to the magnet control circuit switches the feedback signal from the second sensor to the first sensor with the rail joint detection signal of the joint detection switch, and sends a rail joint passing signal. A levitation control device characterized in that a signal switching circuit for returning signals from the first sensor to the second sensor is inserted.