JPS60226793A - Power feeding zone switch converter of linear motor - Google Patents

Abstract

PURPOSE:To prevent a ground coil from burning out by eliminating a closing command to all power feeding coils when a current flowed to a ground coil through a power feeding zone switch is the prescribed value or higher and the command of the switch is not presented. CONSTITUTION:A switch signal generator 5 outputs closing command of power feed switches 4-43 in response to the outputs of position detectors 2-23. Defect detectors 9-93 output defect signal when the maximum value IM of 3-phase current values flowed to ground coils 3-33 through power feed zone switches 4-43 detected by current detectors 8-83 is the prescribed value I0 or higher and a switch closing command is not presented. A memory circuit 12 interlocks a switch closing command from the generator 5 when the defect signal is output from any of the detectors 9-93.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a feeding section switch switching device for a linear motor.

[Prior art]

Conventionally, there has been a device shown in FIG. 1 as a switching device for a feeding section switch for this type of linear motor. In the figure, 1 is a vehicle, 2, 21, 22, 23 is a train position detector, 3, 3
1, 32, and 33 are ground coils, 4, 41, 42, and 43 are feeder classification switches, 5 is a switching signal generator, 6 is a power converter, and 7 is a feeder line.

Next, the operation shown in FIG. 1 will be explained.

A linear motor differs from a normal rotary motor in that the vehicle 1, which is the rotor, faces only a part of the ground coil 3, which is the stator. It is necessary to divide the plurality of coils and use a feeding section switch to switch the coil through which current should flow. Therefore, the position of the vehicle 1 is detected by the train position detector 2,
A switching signal is generated from a switching signal generator 5 to turn on the room classification switch 4 of the coil where the vehicle 1 is located.

At this time, the room classification switches 4, 41, 42° 43 are
As the vehicle 1 moves forward, they are sequentially inserted one by one, and an interlock is provided to prevent two or more from being introduced at the same time. The power converter 6 passes a current through the ground coil 3I of the vehicle 1 through the feeder line 7 and the room division switch 4, and this operation generates a propulsive force between it and the L8M field on the vehicle.

The conventional linear motor room classification switch switching device is
If the room classification switch configured as described above is normal, there will be no problem, but if the room classification switch fails in the closed state, the following problems will occur. That is, assume that vehicle 1 passes through the section of ground coil 3 and enters the section of ground coil 31. At this time, when the vehicle position is detected by the position detector 21 and the detection signal at this time is sent to the switching signal generator 5, the switching signal generator 5 outputs an opening command to the compartment classification switch 4, A closing command is output to the room classification switch 41. However, if the room division switch 4 is malfunctioning and cannot be opened even after receiving the opening command, the electrical division switch 4 remains in the ON state, and both the room division switch 4 and the room division switch 41 are turned on. It will be in the inserted state. The equivalent circuit at this time is shown as shown in FIG. Although FIG. 2 considers only a single phase, the same applies to other phases. Second
As is clear from the figure, the ground coil 31 facing the L8M field 11 on the vehicle forms a closed circuit with the room classification switch 41.4 and the ground coil 3.

Therefore, the voltages e and Il generated by the movement of the field are as follows:
A short circuit occurs in the circuit shown in FIG. 2, and a large short circuit current flows. As a result, a large brake force is generated in the vehicle, and the temperature of the coil and feeder wire increases due to this current.

Further, if the initial speed is high, the vehicle further passes through the section of the ground coil 31 and also enters the coils after the ground coil 32. At this time, the room division switches 42 and subsequent ones are turned on one after another, and the short-circuit condition continues, so a short-circuit current continues to flow for a long period of time in the ground coil 3 where the faulty switch is located, and there is a risk that the coil will burn out.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by detecting the failure of the room division switch and prohibiting the turning on of a new room division switch, short circuit current can be prevented for a long time. The present invention provides a switching device for a room division switch of a linear motor that can prevent accidents that continue over time and protect the coil from burnout.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, the same parts as in FIG. 1 are shown with the same reference numerals. In FIG.
1, 32. A current detector that detects the current flowing in 33, 9
, 91, 92° 93 is the current detector 8, 81, 82 .
Detection current value of 83 and room classification switch 4, 41 to 43
The circuit is configured as shown in FIG. 4, for example, with a failure detector that receives as input the closing signal given to the switch and detects a failure of the switch. Further, 10.13 is an AND circuit, and 12 is a memory circuit.

Next, the operation of the present invention will be explained. First, current detector 8
．． The three-phase current values detected at 81 to 83 are determined by a maximum value selection circuit 901 to obtain a maximum value IM, and by a comparator 904 to be compared with a predetermined current value IO set by a DC power supply 902 and a variable resistor 903. , if IM<IO, outputs an H output. The OR circuit 905 connects the switch closing command and the comparator 90.
The outputs of 4 are ORed and used as the output signal of the failure detector 9.

That is, in the failure detector 9, there is no switch closing command and the current value is 1. The output becomes L only when ≧IQ. Normally, if the switch is open, no current flows, so IM<IO, and the output of the failure detector 9 will never become L.

However, when a failure occurs while the switch is in the on state, a short circuit current flows without a switch on command, and IM≧IQ, so the output of the failure detector 9 becomes L. Therefore, when the output of the failure detector 9 becomes L, it can be determined that the room classification switch 4 is in failure.

Therefore, the AND circuit 10 is connected to the fault detector 9, 91°92
．． The outputs of all 93 failure detectors are ANDed, and if any one detects a failure, an L output is generated. Then, it is stored in the memory circuit 12, receives the L output signal of the AND circuit 10, sets the output level to L, and holds that state.

The AND circuit 13 is an AN between the output signal of the memory circuit 12 and the switch closing command output from the switching signal generator 5.
By taking D, an interlock is provided so that if the output signal of the memory circuit 12 becomes L, even if the switching signal generator 5 outputs a closing command to each switch, it will not be accepted. Although FIG. 3 shows signal processing for only the closing command, no processing is performed for the opening command, and the opening command output from the signal switching generator 5 is directly applied to the switch.

Further, FIG. 5 is a diagram showing one embodiment of the present invention, and is an explanatory diagram of the operation of the apparatus shown in FIGS. 3 and 4. (a) shows the case where the foot room classification switch 4 is normal; Φ) shows the case where the foot room classification switch 4 cannot be opened.

First, in (a), at time t, when a command to open the fourth room classification switch is given, the fourth room classification switch
is normally open. As a result comparator 904
The output of 1. After that, the signal becomes H, and the failure detector 9 does not generate an output. Therefore, the output signal of the memory circuit 12 continues to be in the H state. Therefore, subsequent input commands are
The room classification switches 41 and 42 are sequentially turned on. On the other hand, (b) is at time t.

This shows a case where the room classification switch 4 does not open even if a command to open the room classification switch 4 is given. At this time, since a current flows through the ground coil 3 even after the closing command of the room classification switch 4 becomes L, IM≧IQ, and the failure detector 9 becomes L. As a result, AND circuit 1
The output signal of 0 becomes L, and the output signal of the memory circuit 12 changes from H to L. Therefore, even if the switching signal generator 5 outputs a closing command for the room classification switch 42 from then on, the closing command is not given to the room classification switch 42. Not invested. After that, all the changeover switches are not turned on, and no short-circuit current flows. Therefore, the ground coil is protected from burnout.

Incidentally, in the above embodiment, the case where each ground coil is supplied with power from one power converter was explained, but the ground coil is divided into multiple systems, and one power system is supplied to each system. Even in the case of a multi-power linear motor in which the electric system and the power converter correspond to each other, the same effects as in the above embodiment can be obtained by adding a device having the configuration shown in FIG. 3 to each system.

Further, the current detectors 8, 81, 82, 83 may be provided inside the coil.

〔Effect of the invention〕

As described above, according to the present invention, the fault detector accurately detects the state in which the room division switch cannot be opened, and an interlock is provided to prohibit the activation of other unit division switches. In addition to protecting the coil from burnout, abnormalities in the room division switch can be detected quickly, so recovery measures can be taken quickly.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a conventional linear motor room partition switch switching device, Fig. 2 is an equivalent circuit diagram when the room partition switch fails, and Fig. 3 is a diagram of a room partition switch according to an embodiment of the present invention. FIG. 4 is a detailed circuit diagram of a part of the device shown in FIG. 3, and FIG. 5 is an explanatory diagram of the operation of the devices shown in FIGS. 3 and 4. DESCRIPTION OF SYMBOLS 1... Vehicle, 2... Train position detector, 3... Ground coil, 4... Room classification switch, 5... Switching signal generator, 6... Power converter, 7... ...Feeding wire, 8...
・Current detector, 9... Failure detector, 10.13...
AND circuit, 12... memory circuit. Figure 1 Figure 20 1 Figure 3 ξ □Yo=1 (Q) Figure 5 1-i=ko 11: f/I (b)

Claims (1)

[Claims] The ground fill that drives the linear motor is divided into multiple parts,
−
By connecting the power converter of the set and switching the feeding classification switch, current can be applied to the ground coils in sequence. a current detector that detects the current flowing into the current detector, and a failure that determines that the feeding power classification switch is malfunctioning when the current value of the current detector is larger than a predetermined value and there is no turn-on signal of the feeding power classification switch. A detector, and an electrical interlock circuit that prevents a closing command from being given to any of the feeder section switches based on the failure detection result, so that a short-circuit current is not caused to flow through the ground coil even when the feeder section switch fails. A feeding power classification switch switching device for a linear motor, characterized in that the switching device is configured to prevent the feeder from moving.