JPH0611196B2 - Linear induction motor control system - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a linear induction motor control system, and more particularly to a control system capable of correctly stopping a linear induction motor at a desired position.

[Technical background and problems]

Linear induction motor (hereinafter referred to as LIM)
Its use has been studied not only for railways but also for other transportation means such as transportation of work parts in factories and transportation of various files in offices.

Various transportation devices including LIM are generally required to be able to accurately and promptly stop at a desired position.
Due to its high speed, no effective electrical means for accurately and quickly stopping at a desired position has been found in M.

Conventionally, for example, by detecting the speed of the LIM at a plurality of predetermined positions and calculating and supplying an anti-phase exciting current that gives a deceleration acceleration necessary for stopping at a predetermined stop point at each position by a computer. Thus, the speed was reduced to near zero at a predetermined stop point, and finally stopped by the mechanical braking means at the predetermined stop point.
Further, complicated control means is required to properly decelerate to a speed at which it can be stopped by the mechanical braking means.

In general, when controlling the drive control of the LIM using a computer as described above, not only start (including acceleration), stop (including deceleration) and traveling direction, but also complicated control such as carrier speed control of the secondary conductor of the LIM However, if all of these controls are performed by software, the software is also extremely complicated, and the number of signal lines for that is also large, which makes it susceptible to noise.

[Object of the Invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a LIM control system which can start, speed control and accurately and quickly stop at a predetermined position with a control system having a simple structure and which is less susceptible to noise.

[Object of the Invention]

In order to achieve this object, the LIM control system of the present invention has a stator on which the primary-side conductor is mounted and a mover on which the secondary-side conductor is mounted, and runs the mover along the transport path. In such a manner that the stator is arranged along the transport path or the linear induction motor, the mover has a sensor board for position detection and speed detection,
The stator arranged along the conveyance path is applied with a single-phase alternating current, a position detecting means for detecting a position of the mover in the stator, a speed detecting means for detecting a speed of the mover, and a single-phase alternating current. A positioning stop coil and a control coil to which a direct current is applied, and in order to stop control the mover corresponding to the stator, the mover has entered the stator. When it is detected by the position detecting means, deceleration control is performed by exciting the control coil by direct current, and when the speed detecting means detects that the speed of the mover is equal to or higher than a certain value, the primary side conductor is further moved in the traveling direction. And a control circuit for exciting the positioning stop coil when the position detecting means detects that the mover has moved to a substantially predetermined position of the stator. How to run against the circuit , Start-up instruction, the acceleration instruction, deceleration instruction,
It is characterized by being configured by a main control device for selectively sending a stop command and the like.

Example of Invention

 The present invention will be described in detail based on each embodiment.

1 to 7 show an embodiment of the present invention.

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 and FIG. 3 are explanatory views of a stop operation of a LIM used in the present invention, FIG. 4 is an explanatory view of its traveling system, and FIG. A flow chart of the control system, FIG. 6 is a block diagram of a control circuit for performing drive control of the present invention, and FIG. 7 is a control signal system diagram between the main control unit MPU and the control circuit.

In FIG. 1, CB is a transportation device, which includes a carrier CA, tire wheels R _{1 to} R ₄ , a secondary side conductor SC, and a sensor board SB for position and speed detection. GL is a guard rail on which the transportation device CB travels, and D ₁ and D ₂ are columns that hold the guard rail GL at a predetermined height. And carrier CA
Is supported by tire wheels R _{1 to} R ₄ and travels on a guardrail.

CU ₁ and CU ₂ are a plurality of control devices arranged along the guardrail GL. The configurations are common, and the stator S, which is the primary iron core, the primary conductor PC, which is provided on the stator S and generates a traveling magnetic field, A ₁ , A ₂ , which detects the speed of the carrier CA, the carrier CA. And position sensors B ₁ and B ₂ for detecting the positional relationship between the stator S and position sensors C ₁ and C ₂ for detecting whether the carrier CA has advanced into the area of the stator S.

First, the speed and position detection by the speed sensor and the position sensor and the start and stop of the LIM will be briefly described.

The speed detection of the carrier CA by the speed sensors A ₁ and A ₂ is
It is performed by calculating the number of the slits Sl provided on the sensor board SB passing in a unit time.

In addition, the carrier C by the position sensors B ₁ , B ₂ and C ₁ , C ₂
Examples of the position detection method A include a method in which the lower conductor portion CP of the sensor board SB detects a voltage induced in a coil (not shown) of the position sensor, and a position sensor in which a plurality of resonance circuits having a predetermined frequency are provided on the sensor board SB. Receiving a radio wave of a predetermined frequency from the sensor and re-emitting it toward the receiving section of the position sensor, providing a reflector of light or radio wave on the sensor board SB, and transmitting the light or the radio wave emitted from the position sensor to the receiving section. There is a method of directing and reflecting. In this method, the resonance frequency is set to each carrier and each position sensor B ₁ , B ₂ , C ₁ ,
It can be done by changing it according to C ₂ .
In the other method, the carrier and each position sensor can be identified by changing the pattern of the reflected wave or the frequency of the radio wave so as to correspond to each carrier and each position sensor. Both of these speed detection and position detection methods are publicly known.

Next, the LIM starting (including acceleration) and stopping (including deceleration) methods suitable for the control system of the present invention will be briefly described with reference to FIGS. The control device shown in FIG. 2 is a view of the control device shown in FIG. 1 seen from above, and is proposed by the same applicant (Japanese Patent Laid-Open No. 57-3569).

In FIG. 2, S ₁ and S ₂ are stators, PC ₁ and PC ₂ are primary side conductors that generate a traveling wave magnetic field by three-phase alternating current, SC is a secondary side conductor of carrier CA, QCa ₁ and QCa ₂ And QC
b ₁ and QCb ₂ are a pair of positioning stop coils, D
C ₁ and DC ₂ are braking coils.

In this configuration, the stators S ₁ , S ₂ primary side conductors PC ₁ ,
The operation of the PC ₂ and the part of the secondary conductor SC is the same as that of the conventional LIM.

That is, three-phase AC is supplied to the primary side conductors PC ₁ and PC ₂ ,
Depending on the phase relationship, a rightward or leftward traveling magnetic field is generated to accelerate and advance the secondary conductor SC, that is, the carrier CA rightward or leftward. Further, when the secondary conductor SC is traveling in the right (left) direction, the phase of the three-phase alternating current is switched to generate a traveling magnetic field in the left (right) direction. Slow down.

However, in such a conventional method, as described above, it is impossible to accurately stop the secondary conductor SC at a predetermined position in the stators S ₁ and S ₂ only by the electrical method, but for the positioning stop. Coil QCa ₁ , QCa ₂ ; QCb ₁ , Q
Cb ₂ as described in detail in JP-A Sho 57-3569 by the provision, accurately stopped at a predetermined position,
Can be held.

The operation of the positioning stopping coil will be described with reference to FIG. 3 by taking QCa ₁ and QCa ₂ as an example. The primary conductors PC ₁ , P
The effect of C ₂ is neglected because it can be ignored.

The positioning stop coils QCa ₁ and QCa ₂ are excited by using two phases of the three-phase alternating current, that is, a single phase, and as shown in FIG. 3, the coils QCa ₁ and QCa ₂ and QCb ₂ and QCb ₁ are connected to each other. A magnetic flux distribution consisting of a main magnetic flux loop passing through and other leakage loops is generated (see FIG. 2).

Now, when the secondary conductor SC advances from right to left as shown by the arrow and enters the central gears of the stators S ₁ and S ₂ , the secondary conductor SC is positioned by the positioning stop coils QCa ₁ and Qa.
The force F received from Ca ₂ is shown in FIG. 3B when the position of the tip E of the secondary conductor is used as a reference.

That is, when the rightward force is the repulsive force and the leftward force is the attractive force, the magnetic poles out of the two magnetic poles MPa ₁ , MPb ₁ ; MPa ₂ , MPb ₂ around which the positioning low-use coils QCa ₁ , QCa ₂ are wound. When the tip E of the secondary conductor exists between the edge point G ₁ and the center point G ₂ of MPb ₁ and MPb ₂ , a weak attraction force acts, and a repulsion force acts at both ends thereof. And the central point G
After passing ₂ , a large repulsive force Fb ₁ is received.

Focusing on the central point G _2, this past the G ₂ points secondary conductor SC is pushed back to the _two points G receives the repulsive force, toward the _two points G receives the suction force in the prior _two points G Since it is pulled, the secondary conductor SC eventually stops when the tip end E of the secondary conductor SC is at the central point G ₂ and keeps this state.

Therefore, the one-side conductor P is formed so that a traveling magnetic field in the opposite direction is generated.
If C ₁ and PC ₂ are excited to decelerate the secondary conductor SC, that is, the carrier CA, and the forward force is made smaller than the repulsive force Fb ₁ , the secondary conductor SC, that is, the carrier CA It can be correctly stopped at a position where E reaches the central point G ₂ .

Note that the position of stable point G ₂ is the positioning low-use coil QC
It depends on the number of magnetic poles around which a ₁ and QCb ₁ are wound, and it is confirmed that a stable point is inevitably present as the number of magnetic poles increases, but it moves to the left.

Up to now, the force that the secondary conductor SC receives from QCa ₁ and QCa ₂ is only the repulsive force F'as shown by the dotted line in Fig. 3 (b). Therefore, QCa ₁ and QCb ₁ Therefore, it is considered that only deceleration can be performed, and stopping at a predetermined position of the stator cannot be performed unless mechanical braking means is used, and it has been designed as such.

The present invention pays attention to the fact that the force applied to the secondary conductor SC becomes as shown in FIG. 3 (b), and this characteristic is utilized for the bending, and the secondary conductor SC, that is, the carrier C, is used only by the electrical control method.
A is properly stopped at a predetermined position. Moreover the forces acting on the stop point G ₂ in the secondary conductor SC can stably stop without being force any way to the stop so becomes zero.

In principle, only the positioning stop coils QCa ₁ and QCa ₂ are required, but as shown in FIG. 2, by further providing the positioning stop coils QCb ₁ and QCb ₂ , repulsive force,
The suction force is doubled, and it is easy to stop at a predetermined position.

By the way, the positioning stop coils QCa ₁ , QCa ₂ ; QC
When stopping by b ₁ and QCb ₂ , there is a tendency to repeatedly stop forward and backward, so as shown in FIG. ₂ , if control coils DC ₁ and DC ₂ that are excited by direct current are provided, the braking will be performed. The action provides a smooth and quick stop.

Acceleration, deceleration, and starting other than the stopping operation are performed by controlling the excitation of the primary side conductors PC ₁ and PC ₂ as in the conventional LIM, and therefore detailed description thereof will be omitted.

Next, the drive control system of the LIM of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 4 shows the arrangement of the control device, the control circuit for the control device, and the main control device. Six control devices CU _{1 to} CU ₆ are arranged along the guardrail GL, and each control device has:
Independent control circuits CS _{1 to} CS ₆ are arranged for it. These control circuits CS _{1 to} CS ₆ are main control units M
It is controlled by the PU. Then, the left direction is going up and the right direction is going down.

Of the six control unit CU ₁ to CU _6, CU _1, the CU ₄ and CU ₆ as a control device for stopping the positioning, the other CU _2,
CU ₃ and CU ₅ are acceleration / deceleration control devices. In the case of the control device for acceleration / deceleration, the positioning stop coils QCa ₁ , QCa ₂ , QCb ₁ , QCb ₂ and the braking coils DC ₁ , DC _{2 shown} in FIG. Or they may be left open without being excited.

The control circuits CS _{1 to} CS ₆ will be described later.

The control operations such as start, acceleration, deceleration, and stop are shown in FIG. 5 by taking the operation of moving the transportation device CB stopped in the control device CU ₁ to the control device CU ₆ and stopping it there as an example. Follow the flow chart to explain.

(1) In the ST-1 main control unit MPU, initialize the use address for each control circuit CS _{1 to} CS ₆ and check whether each control circuit is in the clear state. If it does not clear,
It is judged that some kind of failure has occurred, and control operation is not performed and the inspection of the failure control circuit is reported. If all the control circuits are in the clear state, the process proceeds to next ST-2.

(2) ST-2 Check whether it is possible to turn on the AC100V power supply for operation to each control circuit. This is for safety measures, for example, to prevent accidental application of current when the control circuit is being inspected.

(3) ST-3 Make the control circuits CS ₁ , CS ₄ , CS ₆ for positioning low stop check whether or not the current position of the carrier can be determined,
Have them report the presence or absence of carriers.

FIG. 6 shows a control circuit common to the positioning low stop and the adjustment use.

The discriminating circuit K ₁ for confirming whether or not the carrier CA is in the stators S ₁ , S ₂ sends the carrier confirmation signal AK ₁ when the sensor board SB is detected by the position sensors B ₁ , B _2. Send to. It is assumed that the carrier CA is present at the control unit CU ₁ . When the carrier CA is stopped in the middle of the controller for some reason, the carrier CA is instructed to be set to the nearest controller. The operator manually sets to the nearest control unit.

(4) ST-4 For each control circuit, AC200V for excitation of primary side conductor PC ₁ etc. positioning stop coil QCa ₁ etc., control coil DC ₁ etc.
Check whether power can be turned on. This is also a safety measure like the AC100V power supply.

Note that the AC200V for the positioning stop coil and the braking coil is not necessary for the control circuit for the acceleration / deceleration device, but this point will be described in the control circuit. As the direct current of the braking coil, AC200V full-wave rectified is used.

(5) ST-5 The operator decides where to stop carrying the carrier CA.

(6) ST-6 The carrier CA currently in the control unit CU ₁ is connected to the control unit CU ₆
The operator inputs the stop destination to a keyboard (not shown) of the main control unit MPU. As a result, the main control unit MPU starts each control unit,
Which of the up, down, and down traveling directions, whether acceleration, stop, or deceleration, is automatically calculated and determined.

(7) ST-7 The main control unit MPU checks whether the condition settings such as start, acceleration, stop, deceleration and traveling direction performed by each control unit are correct, and when they are correct, each control unit starts a predetermined operation. .

(8) ST-8 Each control device performs the set control operation.

The start-up operation control unit CU ₁ of the control device CU ₁ coming command to start from the main control device MPU in the downstream direction is sent.

When the control unit CU ₁ receives the operation start command, the start signal SS
And a down signal RD are generated and supplied together with a carrier confirmation signal AK ₁ to AND ₃ (AND circuit, the same applies below), and through OR ₂ (OR circuit, apply below) to the primary side conductors PC ₁ and PC. ₂ is excited to generate a downward traveling magnetic field, and the carrier CA is activated and accelerated.

In the control unit CU ₁ , the positioning stop coil QCa ₁ etc. and the braking coil DC ₁ etc. are not excited. Also Carrier C
A because the confirmation signal AK ₁ from the position sensor B ₂ and passes through the position sensor B ₂ eliminates primary conductor PC _1, the excitation of the PC ₂ is stopped. Further, the position sensor C ₂ is a carrier CA
When the disconnection is detected, this control circuit is made inoperative.
This blocks noise and reduces power consumption.

Command to accelerate the downward direction from the main control device MPU is sent to the acceleration operation control unit CU ₂ to CU ₅ of the control unit CU ₂ to CU _5. Control unit CU _{2 to} CU ₅
When receiving an operation start command, generates an acceleration signal ACC at the time of passing and a downward traveling signal RD and outputs it to AND ₄ .

When the carrier CA is detected by the position sensor C ₁ , the determination circuit K ₂ for confirming whether the carrier CA has entered the stator generates the confirmation signal AK ₂ and outputs it to the AND ₄ . As a result, AND ₄ generates an output, which excites the primary side conductors PC ₁ and PC ₂ via OR ₂ to generate a downward traveling magnetic field and accelerate the carrier CA in the downward direction.

In this case the control unit CU ₂ to CU _5, the positioning stop coil QCa ₁ etc. and the braking coil DC ₁ like not excited.
The control unit CU ₄ also operates in the same manner as CU ₂ , CU ₃ , and CU ₅ .

Confirmation signal A when carrier CA passes position sensor C ₂
Since K ₂ disappears, the excitation of the primary conductors PC ₁ and PC ₂ is stopped. At the same time, the control circuit is deactivated. As a result, it is possible to prevent the exciting current from mixing into other control circuits as noise and also reduce power consumption.

The stop motion controller CU ₆ of the control unit CU ₆ come command for operation stop the downlink direction of travel from the main control device MPU is sent. When the control unit CU ₆ receives the operation start command, it generates a stop signal STP and a downward traveling signal RD, and outputs them to AND ₆ , AND ₇ , and AND ₈ .

When the carrier CA is first detected by the position sensor C ₁ , a confirmation signal AK ₂ is generated and output to AND ₆ and AND ₇ . This puts the control circuit into operation and
The braking coils DC ₁ and DC ₂ are excited.

Then, the speed of the carrier CA is detected by the speed sensor A and transmitted to the carrier entry speed determination circuit K ₃ .
The carrier inrush speed determination circuit K ₃ determines whether or not the inrush speed of the carrier CA is higher than a set speed, that is, a speed at which only the positioning stop coil can stop, and when it is higher than the set speed, a confirmation signal AK ₃ is generated. AND ₅ and AND
Supply to ₆ .

As a result, AND ₆ generates an output and the primary side conductor PC ₁ ,
The PC ₂ is excited in a reverse phase to generate a traveling magnetic field in the opposite direction to the down direction, and the carrier CA is decelerated below the set speed. When the position sensors B ₁ and B ₂ detect that the carrier CA has been inserted near the center of the stators S ₁ and S ₂ , the determination circuit K ₄ supplies the confirmation signal AK ₄ to the AND ₆ . The distance x ₁ between the position sensors B ₁ and B ₂ is equal to the sensor board S
Because it is substantially equal to the length x ₀ of B, and when the position sensor B _1, B ₂ and both detect sensor board SB, it is determined that carrier CA came to approximately the center of the stator.

When the confirmation signal AK ₄ is supplied to the AVD ₈ , the positioning stop coils QCa ₁ , QCa ₂ , QCb ₁ and QCb ₂ are excited,
The carrier CA is stopped in cooperation with the already excited braking coils DC ₁ and DC ₂ .

(9) ST-9 The speed detection by the speed sensor A is zero, and the position sensor B ₁ ,
When both B ₂ are detected for a certain period of time, it is judged that the stop positioning is completed.

(10) ST-10 Determine whether there is a transportation plan for Carrier CA,
If there is a next transportation plan, the operation returns to ST-5 and the above-mentioned operations are repeated.

Although the above description has been directed to the downward direction, the same applies to operations in the upward direction. Further, the operation for stopping the intermediate control unit CU ₄ is also the same. Of course, the position and number of the acceleration / deceleration control device and the positioning stop control device can be arbitrarily selected.

In this embodiment, the speed is not adjusted during the traveling of the carrier, but speed information from speed sensors in each control unit is sent to the main control unit MPU, and the main control unit next control unit based on this speed information. It is possible to control the traveling speed of the carrier by controlling the exciting current of the primary conductor.

As described above, according to the LIM drive control method of the present invention, the control signal from each control device to the main control device MPU only needs to be in which control device the carrier is located. Then, the operator only needs to input the control device to stop the carrier by an appropriate means, and the MPU automatically determines the start, acceleration, stop, deceleration and traveling direction for each control device, and a predetermined control signal is given. The predetermined drive control is performed by a simple method of transmitting the signal to each control circuit.

For this reason, the software becomes very simple, and maintenance, inspection, modification, etc. become easy.

Further, as shown in FIG. 7, the control signal lines between the respective control devices and control circuits and the main control device MPU can be reduced to the necessary minimum.

Further, the control circuit is inhibited by the position sensors B ₁ , B ₂ , C ₁ and C ₂ except when transmitting and receiving control signals. In other words, the control circuit is in a non-operating state, and the distributed control circuits are each floated (not shown), so that various advantageous effects such as noise being less likely to occur are exhibited. .

Further, if each carrier is identified by the position sensor, it is possible to control the drive of a plurality of carriers.

The above description also applies to other embodiments of the present invention described below.

FIG. 8 shows another embodiment of the present invention.

In this embodiment, the speed sensor A is used to detect the stop position of the carrier CA without using the position sensors B ₁ and B ₂ as shown in FIG.

For this purpose, the speed sensor A counts the number of slits Sl on the sensor board SB to detect the speed, and the number of slits detects the position of the carrier CA.
That is, when the midpoint of the secondary conductor SC and the midpoint of the sensor board SB coincide with the carrier CA, the speed sensor A is placed at the midpoint of the stator S which is the stopping point of the carrier CA.
Is provided. Then, half of the total number of slits on the sensor board SB is set as a counting target, and by counting this value, it can be detected that the carrier has reached the center of the stator S, that is, the target stop positioning point. As a result, one sensor can detect the speed and the stop position, and the number of sensors can be reduced. A counter circuit for detecting the stop position is required, but one chip C is required for the control circuit.
Since it can be easily realized by using PU or the like, there is no particular problem.

The number of slits to be counted does not have to be 1/2 of the total number of slits, and may be a preset fixed value.

For the first carrier drive, the sensor port S
When the speed sensor A is located at the slit portion of B, the position of the carrier CA cannot be detected only by the speed sensor A, so the sensor board S can be used only by the control device that drives the carrier.
The position sensor B may be additionally provided at the height of the lower conductor portion CP of B.

Yet another embodiment of the present invention is shown in FIG.

In FIG. 9, the embodiment of FIG. 8 is further improved so that the sensor board SB is also used as the secondary conductor SC. This integrates the sensor board SB and the secondary conductor SC and simplifies the configuration of the position sensors C ₁ , C ₂ , the speed sensor A and the auxiliary position sensor B.

FIG. 10 shows still another embodiment of the present invention.
The position sensors C ₁ and C ₂ detect the position of the carrier CA by using the secondary conductor SC.

The carrier CA controls the control unit CU by the position sensors C ₁ and C _2.
It is detected that the vehicle has entered the inside of ₁ or CU ₂ , and the control circuit is activated only at that time, and the control devices C ₁ and CU ₂ carry the carrier CA.
As in the case of FIG. 1, the noise is prevented and the malfunction of the control circuit is prevented by making it inoperative when is separated from.

〔The invention's effect〕

According to the present invention, since the carrier can be driven and stopped at a predetermined position by an electric control system having a simple structure, the LIM can be easily used as a transportation means in a yard. That is, according to the present invention, since the single-phase coil is independently provided, it is connected to the single-phase coil when operating the single-phase coil, as described in, for example, Japanese Patent Laid-Open No. 57-3569. The leakage does not occur in the three-phase coil and the stop is not incomplete, so the power can be increased and the control noise is not adversely affected by the inverter noise, so the circuit configuration is simple. Can be Moreover, by providing a direct current applying coil in combination with this, it is possible to effectively suppress dubbing at the time of stopping, and to stop accurately in a short time.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, FIG. 2 and FIG. 3 are explanatory views of a stop operation of a LIM in the present invention, FIG. 4 is an explanatory view of a traveling system thereof, and FIG. A flow chart for explaining the operation of the control system, FIG. 6 is a control circuit configuration diagram for performing drive control of the present invention, FIG. 7 is a control signal system diagram between the main controller and the control circuit, and FIGS. It is explanatory drawing of the other Example of this invention. In the figure, CU _{1 to} CU ₆ are control devices, CB is a transportation device, CA
Is a carrier, R _{1 to} R ₄ are tire wheels, SB is a sensor board, S ₁ is a slit, CP is a lower conductor plate, SC is a secondary conductor, GL is a guardrail, A ₁ and A ₂ are speed sensors,
B ₁ , B ₂ , C ₁ and C ₂ are position sensors, S, S ₁ and S ₂ are stators, D ₁ and D ₂ are columns, PC ₁ and PC ₂ are primary conductors, QC
a ₁ , QCa ₂ , QCb ₁ and QCb ₂ are positioning stop coils,
DC ₁ and DC ₂ are braking coils, MPU is main controller, C
S _{1 to} CS ₂ are control circuits, K _{1 to} K ₄ are discrimination circuits, and AK ₁ to
AK ₄ is a confirmation signal, SS is a start signal, ACC is an acceleration signal, RU is an uphill traveling signal, RD is a downhill traveling signal, STP.
Is a stop signal, AND _{1 to} AND ₈ are AND circuits, OR ₁ ,
OR ₂ represents an OR circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-56-91686 (JP, A) JP-A-56-71491 (JP, A) JP-A-57-3569 (JP, A) Practical application Sho-53- Microfilm (JP, U) of the detailed description and drawings attached to the application for 145841 (Shokai Sho 55-63257)

Claims (3)

[Claims] 1. A stator having a primary-side conductor mounted thereon and a mover having a secondary-side conductor mounted thereon, wherein the stator is fixed so that the mover travels along a conveyance path. In a linear induction motor arranged along a conveyance path, the mover has a sensor board for position detection and speed detection, and the stator arranged along the conveyance path is the stator in the stator. Position detecting means for detecting the position of the mover, speed detecting means for detecting the speed of the mover, a positioning stop coil to which a single-phase alternating current is applied, and a control coil to which a direct current is applied, In order to stop and control the mover corresponding to the stator, deceleration is performed by exciting the braking coil with direct current when the position detecting means detects that the mover has entered the stator. Control the speed of the mover to When the speed detecting means detects that the above is the case, the position detecting means further excites the primary side conductor in a direction opposite to the traveling direction, and the mover moves to a substantially predetermined position of the stator. A control circuit for exciting the positioning stop coil when detected is provided, and a traveling direction, a start command, an acceleration command, and
A linear induction motor control system comprising a main controller that selectively outputs a deceleration command, a stop command, and the like. 2. The linear induction motor control system according to claim 1, wherein the sensor board is a part of a secondary side conductor of the linear induction motor. 3. A first position detecting means for detecting that the secondary-side conductor has entered and left the control device, and a second position for detecting that the secondary-side conductor has come to approximately the center of the control device. The linear induction motor control system according to claim (1) or (2), which comprises a detection means.