JPH11144954A - Method and means for controlling solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a means for controlling a solenoid by which its plunger exhibits high responsiveness. SOLUTION: A coil wound in the shape of a cylinder is energized for generating magnetic fields. A magnetic circuit is formed through a yoke, a fixed core and a plunger. The plunger is attracted to the excited fixed core. A solenoid operates in this way, and a method for controlling the energization of the coil is provided. In energization, the overexcitation voltage for attracting the separated plunger to the fixed core is applied as a multistage voltage (100 V and 48V), and the holding voltage for maintaining the attraction of the plunger to the fixed core is applied as constant voltage (12V).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method and control means for a solenoid which reciprocates a plunger in an axial direction by a magnetic field generated in an energized coil, and more particularly to a control method and control means for a solenoid which drives a plunger at high speed. It is about.

[0002]

2. Description of the Related Art Conventionally, solenoids have been used in various fields, and among them, a device driven at high speed includes, for example, a weft locking pin device in a shuttleless loom. The weft locking pin device is for winding and storing the weft on a storage drum, and the locking pin is released so that the weft is released by a predetermined length within a predetermined time and the weft insertion operation is performed. Is provided. And
A solenoid is used to project or retract the locking pin at a predetermined timing. Further, the weft locking pin device is configured such that the locking pin moves forward and backward with respect to the surface of the drum that winds and stores the weft by the plunger.
It is configured to have a locking position that prohibits the weft from being released from the drum, and a release position that allows this. A solenoid is used as a mechanism for operating the locking pin. .

As such a solenoid, for example, the solenoid disclosed in Japanese Utility Model Publication No. 6-14414 filed by the present applicant can be mentioned. FIG. 4 is a cross-sectional view of a solenoid disclosed in the official gazette. Solenoid 1
01 is a spring 1 when weft is wound and stored.
The locking pin 103 is projected to the locking position by the elastic expansion force of 02 (the state shown). When the weft is released from the drum, the coil 104 is energized and the core 10 is released.
5 is excited, and the plunger 106 is attracted against the urging force of the spring 102, whereby the locking pin 103 is pulled to the open position.

[0004]

Incidentally, such a solenoid is required to be driven at an extremely high speed depending on the application, but conventionally, it has not been possible to sufficiently cope with the high speed from the viewpoint of control. Was. That is, in a conventional drive circuit (not shown) to which the solenoid 101 is connected, an over-excitation voltage (48 V) for causing the plunger 106 to be attracted to the core 105 is applied to the coil 104, and the attraction of the plunger 106 to the core 105 is completed. At this point, a two-stage pulse input of reducing the voltage to a holding voltage (12 V) for holding the suction state was performed.

FIG. 5 is a graph comparing the relationship between the applied voltage and the stroke of the plunger in a conventional solenoid control method. The upper part is a voltage waveform, and the lower part is a plunger stroke waveform. First, an overexcitation voltage (48 V) is applied for 8 ms from the point E. A magnetic field is generated in the energized coil 104, and the core 105, the plunger 106 and the yoke 10
A magnetic circuit is formed through the layers 7, 108. Then, the plunger 106 is attracted by the excited core 105, and is completely lifted at the time point F (approximately 6.4 ms after the time point E) (the stroke of the plunger is 4.6 m).
m). However, in such conventional control, it takes time until the plunger 106 starts to move, and therefore, a higher responsiveness of the plunger is desired for further higher speed.

Accordingly, an object of the present invention is to provide a control method and control means for a solenoid having a high responsiveness of a plunger.

[0007]

According to the present invention, when a coil wound in a cylindrical shape is energized, a magnetic field generated in the coil is excited through a magnetic circuit formed through a yoke, a fixed iron core and a plunger. A solenoid in which a plunger is attracted to a fixed core that has been separated, and in a solenoid control method that controls energization of a coil thereof, wherein the applied voltage at the time of energization is overexcited for causing a separated plunger to be attracted to the fixed core. The voltage is applied as a multi-stage voltage having different magnitudes, and the holding voltage for maintaining the suction state in which the plunger has completed suction on the fixed iron core is applied as a constant voltage. Therefore, first, a higher voltage is applied as the over-excitation voltage, and a large attractive force acts on the plunger. Then, the voltage value is reduced, and the applied over-excitation voltage further exerts a large attractive force on the plunger, so that the fixed core is fixed. Sucked to the side. Then, the plunger for which suction has been completed is further applied with a holding voltage having a reduced voltage value to the coil to maintain suction. Therefore, according to this solenoid control method, the plunger starts to operate in a short time by the first overexcitation voltage, and the responsiveness can be improved.

Further, in the solenoid control method according to the present invention, the overexcitation voltage is a two-stage voltage, and the application time of the first overexcitation voltage is a time during which the coil does not generate heat. Therefore, first, a higher voltage as the over-excitation voltage is applied for a short time so as not to generate heat in the coil, and a large attractive force acts on the plunger. The suction force works and it is sucked to the fixed iron core side. Therefore, according to this solenoid control method, the plunger starts to operate in a short time by the first over-excitation voltage, and the responsiveness can be improved, and the voltage is applied for a short time so as not to generate heat in the coil. Therefore, damage to the coil is prevented.

According to the present invention, when a current is applied to a coil wound in a cylindrical shape, a magnetic field generated in the coil forms a magnetic circuit through a yoke, a fixed core, and a plunger, and the magnetic field is formed on the excited fixed core. Is a solenoid that is attracted, and in a solenoid control means that controls energization of the coil, the applied voltage at the time of energization is different in magnitude of overexcitation voltage for attracting the separated plunger to the fixed iron core. The method is characterized in that the voltage is applied as a multi-stage voltage, and a holding voltage for maintaining the suction state in which the plunger has completed suction on the fixed iron core is applied as a constant voltage. Therefore, first, a higher voltage is applied as the overexcitation voltage, and a large attractive force acts on the plunger. Then, the voltage value is reduced, and the overexcitation voltage applied further continues to exert a large attractive force on the plunger, so that the fixed core is fixed. Sucked to the side. Then, the plunger for which suction has been completed is further applied with a holding voltage having a reduced voltage value to the coil to maintain suction. Therefore, according to this solenoid control means, the plunger starts operating in a short time by the first overexcitation voltage, and the responsiveness can be improved.

Further, in the solenoid control means according to the present invention, the overexcitation voltage is a two-stage voltage, and the application time of the first overexcitation voltage is a time during which the coil does not generate heat. Therefore, first, a higher voltage as the over-excitation voltage is applied for a short time so as not to generate heat in the coil, and a large attractive force acts on the plunger. The suction force works and it is sucked to the fixed iron core side. Therefore, according to the solenoid control means, the plunger starts to operate in a short time by the first over-excitation voltage, the responsiveness can be improved, and the voltage is applied for a short time so as not to generate heat in the coil. Therefore, damage to the coil is prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a solenoid control method and control means according to the present invention will be described. FIG. 1 is a sectional view showing an embodiment of a solenoid to be controlled by a control method and control means according to the present invention. The solenoid 1 of the present embodiment is a single-type solenoid composed of one coil 2. The coil 2 is wound around a cylindrical coil bobbin 3, and is covered by a yoke formed by assembling a frame 4 surrounding the coil bobbin 3 and a plate 5 provided on the bottom.
Further, the plate 5 is screwed to the stepped cylindrical body 6 to be integrated.

A fixed iron core 7 screwed from above is inserted into the coil bobbin 3, and a plunger 8 movably coaxially is disposed below the fixed iron core 7.
A cushion rubber 9 that absorbs an impact when the upper end of the plunger 8 collides is fitted to the bottom of the fixed iron core 7.
On the other hand, the diameter of the plunger 8 is reduced at the bottom, and the reduced diameter portion is provided in a small hole portion 8 a protruding from the center of the body 6.
It is penetrated so that it may slide. A thin cushion rubber 11 is attached to the bottom surface of the step portion of the body 8, and is urged by a spring 12 so that the step portion of the plunger 8 comes into contact therewith. A drive circuit 21 is connected to a terminal of the coil 2 of the solenoid 1 having such a configuration as a control means for applying a voltage to the coil 2 at a timing described below.

FIG. 2 is a graph showing the relationship between the voltage waveform of the voltage applied by the drive circuit 21 and the stroke waveform of the plunger. The upper part is a voltage waveform, and the lower part is a stroke waveform. The solenoid 1 is energized by the connected drive circuit 21 to the coil 2 as shown in the voltage waveform shown in the figure. First, immediately after the start of driving, the first overexcitation voltage of 100 V is applied to the coil 2 of the solenoid 1 by one.
The second over-excitation voltage of 48 V is applied for a time of 7 ms. Therefore, as compared with the conventional case described above, the overexcitation voltage of the conventional 48 V is 8 m.
In this embodiment, the application time of the over-excitation voltage is the same as 8 ms, whereas the application time of the over-excitation voltage is 8 ms.
A high voltage of 0 V was applied.

Therefore, when the coil 2 is energized, a magnetic circuit is formed in the solenoid 1 through the yoke composed of the frame 4 and the plate 5 and the fixed core 7 and the plunger 8. Will be sucked. In this case, the first overexcitation voltage (100
Since a large magnetic field is generated in the coil 2 by V), the attractive force acting on the plunger 8 is large, and the coil 2 is pulled up vigorously against the urging force of the spring 12, so that the pulling start time is shortened. Further, the acceleration of the plunger 8 pulled up due to the increase of the suction force was increased, and the pulling time was shortened.

Such an over-excitation voltage is timed by a clock pulse, and the first over-excitation voltage (100 V) is supplied for 1 ms at a time A from the drive circuit 21 at the start of driving.
Is output, and then the second over-excitation voltage (48
V) is output, and a two-stage overexcitation voltage as shown in FIG. Therefore, the plunger 8
A magnetic force generated by the first over-excitation voltage (100V),
It is continuously attracted by the magnetic force generated by the second over-excitation voltage (48V), and at time B (approximately 5.4 m from time A).
s), it is completely pulled up to the fixed iron core 7 side (the plunger stroke is 4.6 mm as in the conventional example). After that, the holding voltage (12 V) is output from the drive circuit 21, and the plunger 8 is attracted and held on the fixed iron core 7 by the exciting force generated by the coil 2.

FIG. 3 is a diagram in which stroke waveforms of the plunger in the case of control by three-stage pulse input of the present embodiment and the case of conventional control by two-stage pulse input are overlapped. As can be seen, even when the over-excitation voltage is applied at the same timing, the time until the start of the plunger is reduced, and the moving speed of the plunger is also increased. At point Q (at the time of collision with the fixed iron core), there was a difference of about 2 ms. Therefore, in the control of the solenoid 1 by the drive circuit 21, a three-stage pulse input is made by the overexcitation voltage and the holding voltage in two stages, and in particular, the first overexcitation voltage immediately after the start of driving, which requires the most force to pull up the plunger 8, is Conventional about 2
By applying a voltage of twice the value, the pull-up time was shortened, while the application time was shortened so as not to generate heat in the coil 2, so that high-speed driving was possible without imposing a load on the coil.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention. For example, the first over-excitation voltage, the second over-excitation voltage, and the applied voltage and application time of the holding voltage shown in the above-described embodiment are examples, and other settings can be made. Further, for example, in the above embodiment, the single type solenoid 1 is shown, but a double type solenoid formed so that the plunger is driven up and down by a pair of solenoids may be used.

[0018]

According to the present invention, the voltage applied to the coil is applied as a multi-stage voltage having different magnitudes of overexcitation voltage for attracting the separated plunger to the fixed core, and the plunger is completely attracted to the fixed core. Since the holding voltage for maintaining the suction state is applied as a constant voltage, it is possible to provide a solenoid control method with a high responsiveness of the plunger. In addition, the present invention applies an applied voltage to the coil, applies an over-excitation voltage for attracting the separated plunger to the fixed core as a multi-stage voltage of a different magnitude, and sets a suction state in which the plunger is completely attracted to the fixed core. Since the holding voltage for holding is applied as a constant voltage, it is possible to provide a solenoid control means with high plunger responsiveness.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a solenoid connected to a drive circuit.

FIG. 2 is a graph showing a relationship between a voltage waveform of an applied voltage by a drive circuit 21 and a stroke waveform of a plunger.

FIG. 3 is a diagram in which stroke waveforms of a plunger in the case of control by three-stage pulse input according to the embodiment and the case of conventional control by two-stage pulse input are overlapped.

FIG. 4 is a sectional view showing a conventional solenoid.

FIG. 5 is a diagram showing a graph in which a relationship between an applied voltage and a plunger stroke in a conventional solenoid control is compared.

[Explanation of symbols]

 Reference Signs List 1 solenoid 2 coil 3 coil bobbin 4 frame 5 plate 6 body 7 fixed iron core 8 plunger 9 cushion rubber 10 bush 11 cushion rubber 12 spring 21 drive circuit

Claims (4)

[Claims] When a current is applied to a coil wound in a cylindrical shape, a magnetic field generated in the coil is formed through a yoke, a fixed core, and a plunger to form a magnetic circuit, and the plunger is attracted to the excited fixed core. A solenoid control method for controlling energization of a coil of the solenoid, wherein the applied voltage at the time of energization is a multi-stage voltage having different magnitudes of overexcitation voltage for attracting a separated plunger to a fixed iron core. And applying a holding voltage for maintaining the suction state in which the plunger has been completely suctioned to the fixed iron core as a constant voltage. 2. The method for controlling a solenoid according to claim 1, wherein the overexcitation voltage is a two-stage voltage, and the application time of the first overexcitation voltage is a time during which the coil does not generate heat. Solenoid control method. 3. When a current is applied to a coil wound in a cylindrical shape, a magnetic field generated in the coil forms a magnetic circuit through a yoke, a fixed core, and a plunger, and the plunger is attracted to the excited fixed core. A solenoid control means for controlling energization of the coil, wherein the applied voltage at the time of energization is a multi-stage voltage having different magnitudes of overexcitation voltage for attracting the separated plunger to the fixed iron core. And a constant voltage for applying a holding voltage for maintaining a suction state in which the plunger has been completely sucked into the fixed iron core. 4. The solenoid control device according to claim 3, wherein the over-excitation voltage is a two-stage voltage, and the application time of the first over-excitation voltage is a time during which the coil does not generate heat. Solenoid control means.