JPS61128707A - Levitation controller of magnetic attraction levitating vehicle - Google Patents

Abstract

PURPOSE:To remove an influence which affects the levitation control of a rail seam by switching feedback signals from two gap sensors by the pulse output at the seam passing time. CONSTITUTION:A gap detecting sensor is composed of a main gap sensor 3a and an auxiliary gap sensor 3b disposed forward of a traveling direction. When the output of a diode 9-1 increases in a pulsating manner due to the seam passage of the sensor 3b, an FF circuit 11 is set to switch a feedback signal from the sensor 3a to the sensor 3b. Then, when the sensor 3a passes the seam by the movement of a vehicle, the FF circuit 11 is reset to again return the feedback signal of controlling the levitation to the sensor 3a.

Description

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

[Conventional technology]

In magnetic attraction levitation 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. A gap G between the rail and the levitation magnet 2 is detected by a gap sensor 3 installed on the vehicle body, and a feedback signal from it is calculated by a magnet control device 4. This is processed and amplified by a power amplifier 5 to control the current of the magnet 2 and 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. This has the disadvantage that the magnets may come into contact with the iron rails and the riding comfort may deteriorate. The same can be said not only for railways but also for goods transportation lines etc. that apply the same principle.

An object of the present invention is to eliminate such problems and improve the reliability of the levitation control device.

[Means for solving problems]

In order to achieve the above object, the present invention provides a levitation control device that uses at least a feedback signal from a gap sensor for levitation control, and includes a main gap sensor and an auxiliary gap sensor disposed in front of the main gap sensor in the direction of movement. Consisting of two sensors, the feedback circuit from both sensors to the levitation magnet control device switches the feedback signal from the auxiliary gap sensor's rail joint passing output to the levitation magnet control device from the main gap sensor to the auxiliary gap sensor. A seam passage discriminator is provided which returns the seam passage output from the main gap sensor to the original main gap sensor.

In this way, the influence of the pulsed output of the gap sensor can be avoided, and the gap between the rail and the rail can be detected without interruption.

Fig. 1 is a block diagram showing the overall configuration of the device, where 3a is a main gap sensor placed above or below the iron rail, 3b is an auxiliary gap sensor placed a certain distance in front of it, and 7 is a joint passage. 4 is a magnet control device, 5 is a power amplifier, and 2 is a levitation magnet.

Further, FIG. 2 shows an example of a specific circuit configuration of the seam passage discriminator 7. This discriminator is used for each gap sensor 3
Differential amplifier 8-118-2 connected to the output section of a and 3b
1 diode 9-1 + 9 2 + delay circuit 10-t,
IC) z, RS flip-flop circuit 11 (hereinafter abbreviated as FF circuit) connected to both delay circuits,
It is interposed in a feedback circuit from each gap sensor to the control device 4, and is turned on and off by the output of the FF circuit 11.
The FF circuit 11 is composed of transistors 121 and 122 which are F-controlled, and in a reset state, the output of the circuit Q is high and the output of the circuit Q is low. This state is when there is no rail joint, and the transistor 12-2 is ON.
, 12-x are turned OFF, levitation control at locations where there are no rail joints is performed by the feedback signal of the main gap sensor 3a.

On the other hand, the operation of the device when passing through the seam is as shown in the time chart of FIG. That is, as described above, until the auxiliary gap sensor 3b reaches the seam, the FF circuit 11 is in the reset state, and the levitation control is performed by the feedback signal of the main gap sensor 3a. When the output from that increases in a pulse-like manner as shown in FIG. 3, the output of the diode 9-t increases in a pulse-like manner, passes through the delay circuit 10-1, and is outputted from there after delaying the timing t by a certain period of time. FF
The circuit 11 is set so that the output of Q is high and the output of Q is low. Therefore, the transistor 12-1 is turned on,
12-, it becomes OFF and the feedback signal for magnet control is switched from the main gap sensor to the auxiliary gap sensor.

Next, as the traveling body continues to move, the main gap sensor 3
When a passes through the seam, the output of the diode 9-2 increases in a pulse-like manner due to an operation symmetrical to the above, which resets the FF circuit 11 after a certain time delay in the delay circuit 10-2, causing the output of Q to become low. , Q becomes high, and the feedback signal for the levitation control returns to the main gap sensor again.

Note that the delay circuits 10 s and 102 are designed so that if the feedback circuit is switched while the gap sensor is passing through the seam, the effect of the gap will appear on the levitation control.
This is provided to reliably prevent this inconvenience and further enhance the reliability of the device.

〔effect〕

According to the device of the present invention described above, the feedback signals from the two gap sensors are automatically switched by the pulse output when the rail joint passes, and the influence on the levitation control of the rail joint is eliminated. Abnormal movement of the magnet is prevented, and vertical movement due to mutual contact between the magnet and the rail and the passage of the traveling body through the joint is eliminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the levitation control device of the present invention, and FIG.
The figure shows an example of the circuit configuration of the seam passage discriminator adopted in the device, FIG. 3 is a time chart of the operation of the device, FIG. 4 is a block diagram of a conventional levitation control device, and FIG. It is a figure which shows the output state of the gap sensor of the apparatus when it passes through a seam. 1... Iron rail, 2... Levitation magnet, 3a.
...Main gap sensor, 3b...Auxiliary gap sensor, 4...Magnet control device, 5...Power amplifier,
7... Seam passage discriminator, 81.82... Differential amplifier, 91.9-2... Diode, 10 s, 102
...Delay circuit, 11...R5 flip-flop circuit, 121, 122...Transistor Patent applicant: Sumitomo Electric Industries, Ltd. Agent: Kama 1) Text 2 Figure 1 Figure 3 Tiger/Distor 12- #1
I2-2 OFF ON Fig. 4 Fig. 5

Claims (2)

[Claims] (1) A levitation control device for a magnetically attracted levitation vehicle which maintains the gap constant by feeding back at least a gap detection signal between the iron rail and the levitation magnet to a control device for the levitation magnet. The gap detection sensor consists of two sensors: a main gap sensor and an auxiliary gap sensor placed in front of the main gap sensor in the direction of travel.The feedback circuit from both sensors to the control device for the levitation magnet uses the output of the auxiliary gap sensor to pass through the rail joint. A levitation control device comprising a seam passage discriminator that switches a feedback signal to a levitation magnet control device from a main gap sensor to an auxiliary gap sensor and returns it to the original main gap sensor using a seam passage output of the main gap sensor. (2) The levitation control device according to claim (1), wherein the seam passage discriminator includes a delay circuit that delays the timing of switching and restoring the feedback signal by a certain period of time.