JPS61116908A - Controller of magnetic levitation vehicle - Google Patents

Abstract

PURPOSE:To suppress the variation in the output of a gap sensor in case of passing the seam of iron rails by providing a seam compensator in a feedback circuit from the sensor to a power source side of a levitation electromagnet. CONSTITUTION:The first seam detector 6 is provided forward of moving direction of a gap sensor 1, and the second seam detector 7 is provided backward. When the detector 6 operates, an SCR20 is turned OFF, an SCR21 is turned ON to form the charger of a capacitor C. Thus, the sensor 1 detects the seam 19 of an iron rail 12 to generate the abrupt variation in the signal, which is absorbed to the capacitor C, and not input to a comparator 9. Then, when the detector 7 operates, the SCR20 is turned ON, and the SCR21 is turned OFF to discharge the capacitor C. Then, the signal from the sensor 1 is directly fed back to the comparator 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a magnetically levitated traveling body, and particularly to a control device that eliminates the influence of rail joints.

[Conventional technology]

In a magnetic levitation vehicle that uses the force that an electromagnet attracts to a steel rail, a gap sensor detects the gap between the levitation electromagnet and the iron rail, and the detection result is fed back to the power source of the levitation electromagnet. The gap is controlled to be kept constant.

[Problem that the invention seeks to solve]

In the magnetically levitated vehicle as described above, if there is a seam in the levitation iron rail, the gap sensor detects the seam, and as a result, the output of the gap sensor fluctuates greatly each time it passes the seam, resulting in poor gap feedback control. It becomes stable. Therefore, there is a risk that the levitation electromagnet will come into contact with the iron rail, and there is also the problem that riding comfort will be poor in vehicles such as linear motor cars.

[Means for solving problems]

As shown in FIG. 1, this invention provides a seam compensation circuit 5 in the feedback circuit 4 leading from the gap sensor 1 to the power source 3 side of the levitation electromagnet 2, and provides a seam compensation circuit 5 at a constant interval in front and rear of the gap sensor 1 in the traveling direction. First and second seam detection devices R6 and 7 are installed in the building, and the output of the first seam detection device 6 activates the seam compensation circuit 5, and the output of the second seam detection device 7 activates the seam compensation circuit 5. It was designed to stop.

In FIG. 1, 8 is a gap setting section, 9 is a comparison section, and 10 is an amplification section.

[Effect]

In the above control table, when traveling on a part other than the joint of the iron rail, the supplementary road circuit 5 is in an inactive state,
The output of the gap sensor 1 is directly input to the comparator 9. When the 1a-th detection device 6 detects the joint of the iron rail, the compensation circuit 5 is activated, so that a compensation signal is output to the comparator 9. Furthermore, when the gap sensor 1 passes through the seam, the second seam detection device 7 stops the operation of the compensation circuit 5, so the output of the gap sensor 1 is input to the comparator 9, and from then on, the first seam detection device This state is maintained until 6 detects the next seam.

〔Example〕

As shown in FIG. 2, the running body 11 is equipped with a levitation electromagnet 2 that is attracted to the rail 12, a gap sensor 1, and a control circuit 13. In front of the gap sensor 1 in the running direction, a first joint detection device 6 is provided which is a photoelectric switch that sandwiches the chichi rail 12 and has a light projecting section 14 on one side and a light receiving section 15 on the other side. Further, behind the gap sensor 1 in the traveling direction, a second seam detection device 7 is provided, which is a photoelectric switch provided with a similar light projecting section 16 and light receiving section 17.

In addition, the code|symbol 19 is a joint of the iron rail 12.

FIG. 3 shows an example of the compensation circuit 5, in which a capacitor C is connected to the feedback circuit 4 from the gap sensor 1 to the comparator 9, and SCRs 20, 21 as switching elements are connected in parallel and in series with the capacitor C. is connected. These 5CR20, 21 are of the so-called GTO type (gate turn-off type), and the first
The second transistor is turned on by a positive pulse from the pulse generating circuit 22, 23, and turned off by a negative pulse. Further, the first and second birds are the pulse generating circuit 22.
23 is actuated by the aforementioned first and second seam detection devices 6.7.

That is, the first seam detection device 6 detects the first seam +)ff
The pulse generation circuit 22 generates a pulse with a negative trigger and generates a pulse.
CR20 is turned off, and the second pulse generating circuit 23 generates a pulse with the positive trigger turning on S(:R21. This forms a charging circuit for the capacitor C, and the gap sensor 1 connects to the iron rail. The capacitor C1ζ absorbs the sudden RrL flaw signal change generated by detecting the seam 19 of No. 12 and does not input it to the comparison section 9.

Next, when the second seam detection device 7 is activated after the gap sensor 1 passes the seam 19, the first bird generates a pulse and the positive pulse generator circuit 22 turns on 5CR20, and the second bird The pulse generating circuit 23 generates a negative pulse to turn off the 5oR 21.

As a result, the capacitor C is discharged, and thereafter, the signal from the gap sensor 1 is directly fed back to the comparator 9.

Next, in the embodiment shown in FIG. 4, a DC power supply E is connected to the feedback circuit 4 via a 5CR24.
5CR24 in this case is also of the GTO type as in the above case. The above DC power supply E is set to have a voltage at the same level as the signal fed back from the gap sensor 1 to the comparator 9 when the gap is maintained at the set value.

In addition, the first seam detection length 6 is connected to the pulse generation circuit 25.
The positive trigger generates a pulse to turn on the SCR 24 and maintain the voltage of the feedback circuit 4 at a constant voltage. Further, when the second seam detection device 7 is activated, the pulse generating circuit 25 generates a negative pulse to turn off the 5CR 24 and disconnect the DC power source E from the feedback circuit 4.

In the embodiment shown in FIG. 5, a hold circuit 26 having a memory function is connected to the feedback circuit 4, and when the activation signal of the first seam detection device 6 is input, the signal level of the feedback circuit 4 at that time is detected. The signal level is stored in the hold circuit 26, and the signal level output to the comparator 9 is held at the memory value.

This hold is released when the activation signal of the first seam detection device 7 is input.

〔effect〕

As described above, the present invention provides a seam compensation circuit in the feedback circuit leading from the gap sensor to the power supply side of the levitation electromagnet, operates the seam compensation circuit by the first seam detection device to output a compensation signal, and Since the detection device is used to stop its operation, it is possible to suppress fluctuations in the output of the gap sensor when passing through the joints of the iron rail.

1. As a result, there is no danger of the levitation electromagnet coming into contact with steel, and when applied to a vehicle such as a linear motor car, it has the effect of improving riding comfort.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the basic structure of this invention, Figure 2
The figure is a schematic plan view of a part of the gap sensor, and FIGS. 3 to 5 are block CI of an embodiment of the compensation circuit. 1... Gap sensor, 2... Levitating electromagnet, 3
... Power source, 4... Feedback circuit, 5... Compensation circuit, 6... First joint detection device, 7... Second joint detection device, 11... Traveling body, 12... iron rail, 1
9... Seam. Patent applicant Sumitomo Electric Industries, Ltd. Agent Kama 1) Text 2 Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] In a control device for a magnetically levitated vehicle that maintains the gap constant by feeding back the output of a gap sensor that detects the gap between the iron rail and the levitation electromagnet to the power supply side of the levitation electromagnet, A seam compensation circuit is provided in the feedback circuit leading from the gap sensor to the power supply side of the levitation electromagnet, and first and second seam detection devices are installed at a certain interval in front and behind the gap sensor in the traveling direction, respectively, and 1. A control device for a magnetically levitated vehicle, characterized in that a seam compensation circuit is activated by an output of a seam detection device, and an operation of the seam compensation circuit is stopped by an output of a second seam detection device.