JP2564384B2 - Control method of rotating ring - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of controlling a rotary ring of a ring spinning machine or a ring twisting machine and a control device thereof, and particularly to suppress power loss of the rotary ring to a minimum. The present invention relates to a preferable rotating ring control method and control device.

[Conventional technology]

In the prior art, as disclosed in Japanese Utility Model Laid-Open No. 61-191477, the rotary part is simply divided into a rotary part and a fixed part, and the rotary part is pulled by a traveler to rotate.

Further, as described in JP-A-62-206036, only the mechanical braking is used to stop the rotating part.

[Problems to be Solved by the Invention]

In the above-mentioned prior art, the rotational speed of the rotating ring during operation is not controlled at all, and therefore the rotating part reaches almost the same number of revolutions as the traveler, and the power loss of the rotating ring increases. There was a problem of inefficiency.

In addition, the rotating ring that is rotating may run elliptically during deceleration, and it may not fall below the rotation of the traveler or the spindle, unwinding or cutting the thread, so it was necessary to attach a mechanical brake.

By the way, the total power loss during rotation of the rotating ring is
As shown in the figure, it is approximately proportional to the power loss (hereinafter referred to as "ring windage loss") caused by the rotation of the rotating part of the rotating ring (a) and the relative speed of the traveler and the rotating part of the rotating ring. Friction power loss (hereinafter referred to as "traveler friction loss") and (b) are the sum ((b) + (b)). In particular, the rotary part of the rotary ring supported by the air bearing can reach a rotational speed almost equal to that of the traveler. In this way, when the number of rotations increases, the ring windage (a) increases, and there is a region where the total power loss ((a) + (b)) increases. It is necessary to control the rotation so that the total power loss ((a) + (b)) becomes the minimum value.

An object of the present invention is to provide a method for controlling a rotary ring that can minimize the power loss of the rotary ring of a ring spinning machine or a ring twisting machine.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention controls the number of rotations of the rotating portion of the rotating ring so that the sum of the ring windage loss and the traveler friction loss becomes substantially minimum.

[Action]

In the method of the present invention, the number of rotations of the rotating portion of the rotating ring is controlled so that the total power loss, which is the sum of the ring windage loss and the traveler friction loss, becomes approximately the minimum value. As a result, it is possible to minimize the total power loss of the rotating part,
In particular, since the ring spinning machine and the ring twisting machine use a large number of rotating rings, it is possible to significantly save energy.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an example of an apparatus for carrying out the method of the present invention. FIG. 1 is a plan view and FIG. 2 is a vertical sectional front view.

The apparatus of the embodiment shown in these figures includes a rotating ring, an electromagnetic coil 6, and a DC power source (not shown) for the electromagnetic coil.
And a current controller (not shown).

The rotating ring has a fixed portion 1 and a fixed portion 2. A bearing clearance 3 for a rotating portion is formed in the fixed portion 1. The rotating part 2 is provided with a flange 4 at one end in the axial direction and a sliding part 5 for a traveler at the other end. The flange 4 of the rotating portion 2 is arranged in a bearing clearance 3 formed in the fixed portion 1, and the rotating portion 2 can be rotated in a horizontal state on the fixed portion 1 via the bearing clearance 3 and the flange 4. Is supported by.

The electromagnetic coil 6 is composed of an iron core 7 provided on the fixed portion 1 of the rotating ring and a coil 8 wound around the iron core 7. The iron core 7 is arranged opposite to the outer periphery of the rotating portion 2 of the rotating ring with a gap. In the coil 8,
A DC power supply is connected via the current control unit. Further, one electromagnetic coil 6 or a plurality of electromagnetic coils 6 are arranged on the outer circumference of the rotating part 2 at equal intervals in the circumferential direction so as to be electromagnetically opposed to each other in a non-contact manner.

A traveler 9 is installed on the sliding part 5 provided at the other end of the rotating part 2 of the rotating ring so that the traveler 9 can be routed along the sliding part 5.

Next, an example of the method of the present invention will be described with reference to the operation of the apparatus shown in FIGS.

In the above apparatus, the coil 8 of the electromagnetic coil 6 provided on the fixed portion 1 of the rotating ring is used as a primary winding, and the rotating portion 2 is used as a secondary circuit for electromagnetic coupling.

Then, when a direct current (not shown) is applied to the coil 8 by a direct current (not shown), the electromagnetic coil 6 is excited, and the electromagnetic core 6 of the electromagnetic coil 6 and the rotating portion 2 of the rotating ring 2 are moved at a relative speed. An eddy current flows in the rotating part 2 and a braking force is generated. This braking force acts in the direction of suppressing the rotational speed of the rotating part 2 that is rotated by being pulled by the traveler 9 by the frictional force of the sliding part 5 provided at the other end of the rotating part 2.

Since the magnitude of the braking force can be adjusted by controlling the exciting current, a current control unit (not shown)
The direct current supplied from the DC power source to the coil 8 of the electromagnetic coil 6 is controlled by the torque by the traveler 9 to pull the rotating portion 2 and the electromagnetic coil 6 causes the rotating portion 2 to move.
The rotation speed at the point where the braking force acting on the
Will rotate. Therefore, the DC current supplied to the coil 8 of the electromagnetic coil 6 is appropriately controlled so that the rotation speed of the rotating portion 2 is, as shown in FIG. 5, ring wind loss (a) and traveler friction loss, which are total power loss. Sum with (b) ((b) +
By adjusting the point (b)) to the minimum point b, the efficiency can be improved, and the ring spinning machine and the ring twisting machine have a large number of bobbins, so that significant energy saving can be achieved.

When the rotating speed of the rotating portion 2 increases, the eddy current increases, braking force increases, and the rotating speed of the rotating portion 2 decreases. On the contrary, when the rotating speed of the rotating portion 2 decreases, the eddy current decreases. Since the braking force is reduced, the torque by the traveler 9 works in the direction of overcoming and increasing the rotation speed of the rotating portion 2, so that the rotation of the rotating portion 2 is stable, and thus the sliding of the traveler 9 is also stable, and the yarn as a product is obtained. It is possible to improve the quality of.

3 and 4 show another embodiment of the device of the present invention. FIG. 3 is a plan view and FIG. 4 is a vertical sectional front view.

In FIGS. 3 and 4, the same members as those in the embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals, and further description will be omitted.

By the way, the apparatus of the embodiment shown in FIGS. 3 and 4 shows an example in which a single-phase electric motor is adopted, in which the electromagnetic coil 6 is the primary side (armature) of the electric motor, and the rotating portion 2 of the rotating ring 2 is used. Constitutes a secondary circuit.

Further, the iron core 7 of the electromagnetic coil 6 is provided with a groove on a part of both sides facing the rotating portion 2 of the rotating ring, and the short-circuit ring 10 is mounted in this groove.

The short-circuit ring 10 forms a bear coil, and the iron core 7
The coil 8 and the short-circuit ring 10 are combined to form a stator of the electric motor. By disposing a plurality of the stators facing each other on the outer periphery of the rotating part 2 at equal intervals in the circumferential direction in a non-contact manner, the rotating part 2 is not affected by the material of the conductor, and the torque is balanced. And can rotate well.

It should be noted that the outer circumference of the rotating portion 2 may be taken in by a stator configured by combining the iron core 7, the coil 8 and the short-circuit ring 10 to form an annular shape similar to the stator of a generally used electric motor. it can.

A variable frequency power source installed separately from the variable frequency power source for driving the electric motor of the spindle is connected to the coil 8 of the electromagnetic coil 6, but these members are omitted in the drawing.

Next, another example of the method of the present invention will be described with reference to the operation of the apparatus shown in FIGS.

The short-circuit ring 10 is used as a darkening coil, the electromagnetic coil 6 is used as the primary side of the electric motor, the rotating portion 2 of the rotary ring is used as the secondary circuit, and the coil 8 of the electromagnetic coil 6 is controlled by a variable frequency power source (not shown) for the electromagnetic coil. A direct current is supplied to the electromagnetic field, the moving magnetic field is interlinked, and the electromagnetic coil 6 and the rotating unit 2 are operated as an electric motor.

At this time, by controlling the ratio of the frequency of the variable frequency power source for the electromagnetic coil to the frequency of the variable frequency power source for the electric motor that drives the spindle, the number of revolutions of the traveler 9 close to that of the spindle is controlled. Since the number of rotations of the rotating unit 2 can be adjusted, the frequency of the variable frequency power source for the electromagnetic coil is controlled, and the number of rotations of the rotating unit 2 is set to the ring wind loss (a) and the traveler friction loss (a) which are the total power loss. It can be adjusted to the point b in FIG. 5 where the sum (b) and ((b) + (b)) becomes the minimum value.

Further, since the frequency of the variable frequency power supply for the electromagnetic coil can be adjusted and the rotation speed of the rotating unit 2 can be reduced substantially in proportion to the decrease in the rotation speed of the spindle, the most highly functional and highly accurate control is possible. It is possible.

The other functions of the device shown in FIGS. 3 and 4 are the same as those of the device shown in FIGS. 1 and 2.

Further, both the device shown in FIGS. 1 and 2 and the device shown in FIGS. 3 and 4 generate a braking force by exciting the electromagnetic coil 6 by direct current when the rotating portion 2 of the rotating ring is decelerated. Even without a mechanical brake, it can be decelerated sufficiently and eventually stopped.

〔The invention's effect〕

According to the present invention described above, the rotation speed of the rotating portion of the rotating ring is controlled so that the total power loss, which is the sum of the ring windage loss and the traveler friction loss, is controlled to a minimum value. It is possible to control the total power loss of the part to the minimum, and in particular, since the ring spinning machine and the ring twisting machine use a huge number of rotating rings, there is an effect that a great energy saving can be achieved.

[Brief description of drawings]

1 and 2 show an example of an apparatus for carrying out the method of the present invention. FIG. 1 is a plan view, FIG. 2 is a vertical sectional front view,
FIGS. 3 and 4 show another embodiment of the device of the present invention. FIG. 3 is a plan view, FIG. 4 is a vertical sectional front view, and FIG. 5 is the rotational speed and loss of the rotary part of the rotary ring. It is a graph which shows the relationship with. 1 ... Fixed part of rotating ring, 2 ... Same rotating part, 3 ... Bearing of rotating part, 4 ... Flange of rotating part, 5 ... Sliding part of traveler, 6 ... Electromagnetic coil, 7 ... Iron core of electromagnetic coil, 8 ... Same coil, 9 ... Traveler, 10 ... Short-circuit ring attached to iron core.

Claims (3)

(57) [Claims] 1. A method for controlling the rotation speed of a rotary ring of a ring spinning machine or a ring twisting machine, comprising: a rotary ring having a fixed portion and a rotary portion that is rotated by being pulled by a traveler. The minimum loss rotary ring rotational speed at which the sum of the ring windage loss generated by rotation and the traveler friction loss that is approximately proportional to the relative speed of the traveler and the rotary ring is approximately the minimum value is determined in advance, and the rotary ring is fixed. A current is passed through a current control means to an electromagnetic coil which is provided in a portion and is electromagnetically opposed to the rotating portion of the rotating ring in a non-contact manner, and the current flowing through the electromagnetic coil is controlled by the current controlling means. A method of controlling a rotating ring, wherein the rotating speed of the rotating ring is adjusted to be near the minimum loss rotating ring rotating speed. 2. The rotating ring control method according to claim 1, wherein the current of the electromagnetic coil is a direct current supplied from a direct current power source through the current control means. 3. The rotating ring control according to claim 1, wherein the current control means is a variable frequency power source, and the frequency of the current of the electromagnetic coil is controlled by the variable frequency power source. Method.