JPS63124792A - Controller for linear motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a linear motor control device, and more particularly to multiple control of a plurality of linear motors.

[Prior Art] FIG. 2 is a side view schematically showing a conventional conveying device using a linear motor. In the figure, (1) is the primary coil of the linear motor provided in the conveyance path (2), (3)
is a conveyed object driven by a linear motor, and is called a slider.

(4) is a detector installed between each primary coil along the conveyance path (2) to detect passage of the slider (3).

Figure 3 is a block diagram showing the control circuit configuration of this linear motor. In the figure, (5) is a breaker for the power source;
(6) is the power line, (7) is the reversible primary voltage control section, (
8) is a power line that supplies power from the reversible primary voltage control unit (7) to the linear motor primary coil (1), and (9) is a power line that supplies power from the reversible primary voltage control unit (7) to the linear motor primary coil (1). (10) is the slider position detection signal from the detector (4), (11) is the initial start signal (starting command), (1
2) is a direction command that determines the direction of excitation.

(13) is a speed command that commands the primary voltage of the reversible high voltage control section (7). (14) (15) (16) are connected to each reversible primary voltage control unit (7) from the start/speed command unit (9).
), a start command, a direction command, and a speed command.

Next, the operation will be explained. Coil to linear motor m (
Consider the case of starting from LMl and sending the slider to LMn in 1). If the phase rotation of the motor driven in this direction is in the positive phase, the start command (11) and the direction command (12) will cause the start/speed command unit (9) to command the LC of the reversible-high voltage control unit (7) to start. (14), a direction command (15), and a primary voltage (speed) command (16) are sent to the slider detector (4), and when LMl is excited, the slider (3) is accelerated and moves in the right direction. PH51 is the slider (3
), the start/speed command unit (9) starts the LC2 of the reversible high voltage control device (7) in the same way as in the case of LC, and turns off the excitation of the LC. The slider (3) is re-accelerated on LM2 by energizing the LM of the coil (1) by the linear motor m, and further moves to the right. In this way, the slider (3) is sent one after another and is conveyed to the linear motor m up to LMn of the coil (1). Note that the slider (3) coasts between each primary coil (1) of the linear motor. Further, description of the relationship between the stop control at LMn of the coil (1) of the linear motor m and the primary voltage control and the speed will be omitted. Conversely, slider (3)
When sending from the LMn side to the LM engineering side, the direction command to the reversible-high voltage control section (7) is controlled in reverse phase.

[Problems to be Solved by the Invention] Since the conventional linear motor control device is configured as described above, one reversible high voltage control section is required for each linear motor, which increases the number of units and increases the size of the control device. There were also problems such as being expensive. Another option was to use a single control device and use an electromagnetic contactor to switch, but it took a long time to switch, and the slider would pass through the switch during switching, so several motors up to the light would have to be energized at the same time. As a result, the capacity of the control device is required to correspond to the number of devices that are excited simultaneously, increasing the capacity per device, making maintenance difficult due to frequent switching of the contacts, and shortening the service life. There was a problem.

This invention was made to solve the above-mentioned problems, and its purpose is to provide an inexpensive and easy-to-maintain linear motor control device that can switch the motor with a single reversible primary voltage device. .

[Means for Solving the Problems] The linear motor control device according to the present invention uses a semiconductor switching element to switch the reversible-high voltage control device, which was conventionally provided for each linear motor, so that a single linear motor control device can control a plurality of linear motors. It is designed so that it can be controlled.

[Function] The control device according to the present invention has good response because it switches using a semiconductor switching element, and even if the reversible/high voltage control section performs voltage control, the switching section only controls on/off of the switching element. Therefore, it can be miniaturized and manufactured at low cost.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of the present invention. In the figure, (1) is the primary coil of the linear motor provided in the conveyance path (2), (4) is the slider detector, and (5) is the power source. breaker, (6) is the power line, (8) is the power line that supplies power to the linear motor primary coil (1),
(10) is the slider position detection signal from the slider detector (4), (11) is the initial start signal (start command),
(12) is a direction command, and (13) is a speed command, which are similar to the conventional example shown in FIG.

(17) is one reversible-high voltage control unit similar to the conventional one, (
18) is a switching control section using a semiconductor switching element, (19) is a power line that supplies power from the reversible/high voltage control section (17) to the switching control section (18), and (20) is a slider detector (4). ) reversible according to the signal (10) from -
Start command (21), direction command (
22), speed command (23), and switching control unit (18)
) is a start/speed command section that outputs a switching signal (24) to the motor.

Next, the operation will be explained. Linear motor next coil (
Slider (3) starting from LMl in 1) to LMn
Consider the case of transporting. In this case as well, the excitation direction in which the slider (3) is conveyed to the right is set as the positive phase.

Start by start command (11), start command (13), direction command (14), speed command (15) by speed command part (9)
By sending the signal to the variable primary voltage control section (7) and sending the motor selection signal (17) to the C8 section of the switching control section (17), the LM section of the linear motor secondary coil (1) is energized and the slider (3) is accelerated to the right and sequentially transported to LMn as in the conventional example. Similarly, the description of the primary voltage control and stopping method will be omitted. Also, in the opposite direction LM, from L
Conveyance to Ml can be carried out in the opposite direction by controlling the direction command of the variable primary voltage control section (17) to be in the opposite phase.

In the above embodiment, the reversible primary voltage control unit is used as a method of controlling the linear motor, but VVVF control may also be used. In addition, although the case where there are - sliders (3) is assumed here, it is also possible to transport two or more sliders at the same time if several linear motors are used as blocks and multiple reversible primary voltage control units (7) are used. be.

[Effects of the Invention] As described above, according to the present invention, the voltage control section of the linear motor is 1111, and the semiconductor switching element is turned on and off.
Since the output of the voltage control section is switched by off control, the device can be manufactured at low cost, and has the effect of providing a device with good responsiveness and high reliability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is a side view showing a schematic configuration of a conveying device using a linear motor, and FIG. 3 is a block diagram showing a conventional linear motor control circuit. In the figure, (1) is the linear motor secondary coil, (2)
is a conveyance path, (3) is a slider (transferred object), (4) is a slider detector, (7) and (17) are reversible primary voltage control units (
(voltage control section), (9) (20) is a starting/speed command section,
(10) is a slider position detection signal (transferred object movement position detection signal), (18) is a switching control unit using semiconductor switching elements, (21) is a start command, (22) is a direction command, (23) is a speed command, and (24) is a switching signal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A linear motor in which a plurality of linear motor primary coils are arranged along a conveyance path, and the plurality of primary coils are sequentially energized in a predetermined direction to move a conveyed object on the conveyance path in the predetermined direction. In the control device, a start/speed command unit outputs a start command, a direction command, a speed command, and a switching signal to the primary coil corresponding to the position of the transported object in response to the movement position detection signal of the transported object; A voltage control section receives the startup command, direction command, and speed command from the startup/speed command section, and outputs a voltage according to those commands to each of the above primary coils, and a switching signal from the startup/speed command section. Accordingly, a linear motor control device comprising a switching control section that sequentially switches application of the output voltage of the voltage control section to each of the primary coils using a semiconductor switching element.