JP2002145521A - Traverse device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traverse device operable at a high speed and capable of accurately performing the positioning control. SOLUTION: This traverse device 1 for traversing a yarn Y by normally and reversely driving a driving belt body 2 to reciprocate a traverse guide 4 fitted to the driving belt body is provided with a direct current brush-less motor 5 for normally and reversely driving the driving belt body 2, a rotation detecting unit for detecting a rotating position of the direct current brush-less motor 5, and a control device for controlling the positional feedback of the direct current brush-less motor 5 on the basis of the detecting signal of the rotation detecting unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forward / reverse belt traverse device, and more particularly to a traverse device using a DC brushless motor as a drive motor.

[0002]

2. Description of the Related Art Belt forward / reverse traverse devices are known. As shown in FIG. 10, a conventional traverse device 100
Is a drive pulley 101, guide pulleys 102 and 103
The drive belt body 104 wound around is driven forward and reverse by a stepping motor 106 connected to the drive pulley 101, so that the traverse guide 107 attached to the drive belt body 104 reciprocates to traverse the yarn. Is what you do. In recent years, with the increase in the speed of the apparatus, it has been required to reciprocate the traverse guide 107 ten times or more per second.

[0003]

However, such a conventional traverse device 100 has the following disadvantages because the stepping motor 106 is used as a drive motor.

[0004] The stepping motor 106 is generally a low-speed motor and is not suitable for high-speed operation. Therefore, in order to reciprocate the traverse guide 107 more than ten times a second, it is necessary to increase the diameter of the drive pulley 101, and there is a problem that the traverse device 100 itself increases in size.

Further, when the diameter of the drive pulley 101 is increased, inertia (inertia) of the rotating body increases, and there is a problem that it is difficult to perform high-accuracy positioning at high speed operation. When the motor 106 is reversed, strong tension is applied to the drive belt 104, so that it is difficult to satisfactorily brake the traverse guide 107 at the traverse end. Therefore, it is difficult to control the traverse reversal position with high accuracy.

[0006] Due to the structure in which the direction of the current is switched by the step signal to drive, the vibration becomes large and the shape of the winding package may be disturbed. In order to prevent vibration, it is necessary to attach a damper or a vibration-proof rubber, or to perform special control for preventing vibration.

Since the output torque of the motor is not proportional to the current value, it is not possible to monitor the load of the motor (for example, the state of the drive belt) from the current value. In order to drive forward and reverse at high speed,
A strong force is applied to the drive belt at the time of reversal, and a belt having a low strength may be broken. There is also a problem that the regenerative power cannot be easily taken out due to the structure of the stepping motor 106.

It is an object of the present invention to provide a traverse device which can solve the above-mentioned problems, can operate at high speed, and can perform high-precision positioning control.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and the invention of claim 1 relates to a method in which the drive belt is driven forward and reverse to attach to the drive belt. In a traverse device that traverses the yarn by reciprocating the worn traverse guide, a DC brushless motor that drives the drive belt body in the forward and reverse directions, and a rotation detector for detecting the rotational position of the DC brushless motor, And a control device for performing position feedback control of the DC brushless motor based on a detection signal of the rotation detector.

According to the above configuration, high-speed operation is possible, and the size of the drive wheels (drive pulleys) can be reduced. By reducing the inertia of the rotating body and performing position feedback control, highly accurate positioning in high-speed operation can be performed. Good winding can be performed with almost no vibration during rotation. Since the current value and the torque are in a proportional relationship, the load (torque) of the motor can be monitored from the current value. The traverse guide can be satisfactorily braked at the end of the traverse by using regenerative electric power which can be easily taken out.

According to a second aspect of the present invention, there is provided a traverse device according to the first aspect, further comprising a current detector for detecting a value of a current flowing through the motor coil, wherein the control device makes an abnormality determination based on a change in the detected current value. is there. According to this configuration, the state of the belt can be monitored based on the change in the current value. For example,
The breakage of the drive belt body can be detected quickly and reliably.

A third aspect of the present invention is the traverse device according to the first or second aspect, wherein the control device performs the speed feedback control of the DC brushless motor based on the detection signal of the rotation detector simultaneously with the position feedback control. By the speed feedback control, the speeds in the acceleration period and the deceleration period can be made to exactly match the set speed. Therefore, it is possible to reliably prevent the ear height at which the traverse end bulges outward in the radial direction in the winding package and the ribbon winding in which the yarn layer having a predetermined width is formed in a belt shape on the surface of the winding package.

According to a fourth aspect of the present invention, there is provided a current detector for detecting a value of a current flowing through a motor coil, and the control device performs a current feedback control based on a detection signal of the current detector simultaneously with the position and speed feedback control. A traversing device according to claim 3, wherein the traversing device is used. With current feedback control, torque that is proportional to the current value can be controlled, and even if an excessive load is applied to the motor during high-speed reversal, the motor loses synchronism (the positional relationship between the rotor magnet and the stator coil shifts). It can be reliably prevented.

According to a fifth aspect of the present invention, there is provided a magnetic sensor which is a rotor position detector built in the DC brushless motor, wherein the rotation detector has a frequency corresponding to the rotational speed of the DC brushless motor and a rotational position. 5. A rotary encoder for outputting a pulse signal of a pulse number.
A traverse device according to any of the above. By using a rotary encoder that outputs hundreds to tens of thousands of pulse signals in one rotation separately from a magnetic sensor that is a rotor position detector, for example, high-precision positioning control on the order of tens to 100 μm can be performed. .

According to a sixth aspect of the present invention, a common rectifier circuit is connected to a plurality of drive circuits provided for each DC brushless motor, and the control device has at least some DC brushless motors having different normal / reverse drive phases. The traverse device according to any one of claims 1 to 5, wherein the traverse device is controlled as described above.

According to this configuration, power consumption can be reduced. For example, when a certain weight is decelerating and another weight is accelerating, regenerative power generated by deceleration can be consumed by another weight via a common DC bus. When all the spindles decelerate at the same time, the bus voltage increases due to the regenerative power and is consumed by the regenerative power discharging resistor. According to the present invention, such useless power consumption can be suppressed.

[0017]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a traverse device 1 according to a preferred embodiment of the present invention.

As shown in FIG. 1, the traverse device 1 of the present invention drives the drive belt
A traverse guide 4 attached to the drive belt body 2 reciprocates to traverse the yarn Y, and a direct current brushless motor 5 for driving the drive belt body 2 forward and reverse;
As will be described later, a rotation detector for detecting a rotation speed and a rotation position of the DC brushless motor 5 and a control device for performing position feedback control of the DC brushless motor 5 based on a detection signal of the rotation detector are provided. Things.

The drive belt body 2 is used by being wound around a drive pulley 6 and guide pulleys 7 and 8. The drive belt body 2 has, for example, no slippage and little noise,
A timing belt suitable for high-speed rotation is used. In addition to the timing belt, wires, strings, metal cables,
A flat belt, a V-belt, a metal belt, a chain, or the like may be used.

A substantially rectangular linear guide 9 is provided between the guide pulleys 7 and 8 along the inner surface of the drive belt body 2. The linear guide 9 is for guiding the traverse guide 4 along the traverse direction.

FIG. 1 shows an example of an operation state of the traverse device 1. The yarn Y supplied from a yarn feeding bobbin (not shown) via a yarn feed roller is moved by the traverse device 1 in the left-right direction (the axis of the bobbin 10). (Direction) while being wound on the bobbin 10. Bobbin 1
0 is located at the center of the winding package 11, and is wound on the bobbin 10 by winding the yarn onto the winding package 1.
1 is formed.

The yarn Y is sandwiched between a rotary drum 13 rotated by a drum driving motor 12 and a bobbin 10, and a predetermined tension is applied between the rotary drum 13, the bobbin 10, and the yarn feed roller. That is, the rotating drum 13 is in contact with the winding package 11, and the winding package 11 is in contact with the rotating drum 13 and is driven to rotate.

Cradles 14 are provided at both ends of the bobbin 10. The cradle 14 holds the winding package 11
(The bobbin 10) is rotatably supported.

A rotation detector 15 is provided on the outer periphery of one end of the bobbin 10. The rotation detector 15 is for detecting the rotation speed of the winding package 11, and
A pulse signal (cradle pulse CP) having a frequency corresponding to the rotation speed of 0 is output. The detection signal (cradle pulse CP) of the rotation detector 15 is input to a control unit described later.

In the case of a false twisting machine, the winding package 11 is a tapered end package in which both end faces in the axial direction are inclined. This can be manufactured by controlling the motor 5 to gradually narrow the traverse width as the winding progresses (to gradually move the reversal position inward).

The present invention relates to, for example, a partially drawn yarn (POY)
Twisting (giving crimpability) to multifilament yarns such as
To a false twisting machine for winding. Usually, in the false twisting machine, the traverse width is gradually reduced as the winding becomes thicker, and a tapered end package is manufactured.
Naturally, the present invention is not limited to a false twisting machine, but can be applied to various winding machines including a spinning winder, an automatic winder, a spinning machine (spinning machine), and a multiple twisting machine.

The maximum traverse width TW of the traverse device 1
Is about 254 mm when applied to a false twisting machine, for example. In the present invention, since the DC brushless motor 5 is used, high-speed rotation is possible.
Can be as small as about 38 mm. Under such conditions, the drive pulley 6 leaves about two more turns while the traverse guide 4 moves from one end to the other.
The traverse guide 4 reciprocates about 12 times per second (in the case of 700 double strokes), and the number of rotations of the DC brushless motor 5 is about 50 per second.

Now, the DC brushless motor 5 will be briefly described.

A DC brushless motor (DC brushless motor) is a motor in which the functions of a commutator and a brush of a DC brush motor are replaced with a magnetic sensor (for example, a Hall element) and a semiconductor (for example, a transistor) built in the motor. Yes, a separately provided controller detects the position of a rotor (rotor) with a magnetic sensor, and controls the current flowing through the motor coil with a semiconductor using the signal.

FIG. 2 is a sectional view of the DC brushless motor 5.

As shown in FIG. 2, the DC brushless motor 5 has a rotor 21 provided on an outer periphery of a shaft 20, and a stator 22 provided on the outer periphery of the rotor 21 at intervals. The rotor 21 is a permanent magnet, and four north poles and four south poles are alternately arranged in the circumferential direction in the figure. A motor coil 23 (U-phase winding 23
u, V-phase winding 23v and W-phase winding 23w) are wound so as to form a three-phase star connection.

FIG. 3 is a circuit diagram showing a connection relationship between a DC brushless motor, a drive circuit, and a control device according to the present invention.

As shown in FIG. 3, a drive circuit 30 for driving the DC brushless motor 5 is connected to the motor coil 23. The drive circuit 30 includes pulse width control (P
WM) is connected to a control device (controller) 31 that controls the rotation of the DC brushless motor 5.

As the driving circuit 30, for example, six bipolar field effect transistors 32a to 32f (IGB
T: 3 using Insulated Gate Bipolar Transistor
The phase bridge type circuit is used, and each IGBT32a ~
A diode 3 is connected between the emitter terminal and the collector terminal of f.
3a to 3f are connected. U phase winding 23u is IGBT
32a and 32d, the V-phase winding 23v is an IGBT 32
b, 32e, the W-phase winding 23w is connected to the IGBT 32c, 3
It is connected between 2f. The controller 31 controls each IG
It is connected to the gate terminals of the BTs 32a to 32f.

The DC brushless motor 5 rotates in response to a pulse signal from the controller 31 so that the upper and lower IGBTs 32 alternately turn on and off in a fixed order, and change the direction of the current of the motor coil 23 to rotate. Since the DC brushless motor 5 has no brush, it is maintenance-free, has no friction loss, and can handle a considerable capacity class. In addition, the stepping motor has a large startup torque, has a good start-up, has almost no vibration during rotation, has a proportional relationship between the current value and the torque, can easily take out regenerative power, and does not depend on the power supply frequency. There are advantages.

FIG. 4 is a simplified circuit diagram of the circuit shown in FIG.

As shown in FIG. 4, the DC bus 44 is connected to a parallel capacitor 45 for averaging and smoothing the rectified DC pulsating waves. While the DC brushless motor 5 is decelerating, for example, the IGBTs 32a and 32a
Since f is OFF, the motor works as a generator to serve as a brake, and the regenerative power RP is accumulated in the parallel capacitor 45 via the motor winding 33 and the diodes 33a and 33f. As described later with reference to FIG.
The regenerative power RP generated by the decelerated weight DC brushless motor 5 is supplied from the parallel capacitor 45 to the plurality of motors 5.
(Drive circuit 30) may be supplied to DC brushless motor 5 of another weight that is accelerating via a common DC bus.

In the present invention, when the traverse guide 4 is approaching the traverse end which is the reverse position, D
The C brushless motor 5 is decelerating. At this time, DC
Since the brushless motor 5 functions as a generator and serves as a brake, and the inertia (inertia) of the rotating body such as the drive pulley 6 is small, the traverse guide 4 can be traversed without applying strong tension to the drive belt body 2. It is possible to control the position of the reversal position with high accuracy by braking well in the vicinity of the end. When the traverse guide 4 reaches the traverse end, the DC brushless motor 5 reverses and starts accelerating in a direction opposite to the rotation direction up to that point, and the traverse guide 4 moves away from the traverse end. Thus, the traverse device 1 of the present invention can make the traverse guide 4 reciprocate smoothly.

Next, a circuit for driving the DC brushless motor 5 will be described.

FIG. 5 is a block diagram for driving the DC brushless motor 5 according to the present invention (in the case where highly accurate position control is performed).

As shown in FIG. 5, the driving circuit 50 includes a commercial AC power supply 51, a rectifying circuit 52 for rectifying the commercial AC power supply 51, and a driving circuit 30 for driving the DC brushless motor 5 with rectified DC. , A rotor position detector 53 built in the DC brushless motor 5, a rotary encoder 54 as a rotation detector for detecting rotation of the DC brushless motor 5, and a current detector for detecting a current value flowing through the motor coil 23. Control device (controller) 3 which is connected to a current sensor 55 as a driving circuit, a rotor position detector 53, a rotary encoder 54, and a current sensor 55, and receives the command speed V as a voltage.
1 and a power supply circuit 56 that generates control power to be supplied to the rotor position detector 53, the controller 31, and the like.

As the rotor position detector 53, for example,
Three Hall sensors, which are magnetic sensors, are used.
The rotary encoder 54 is of an incremental type that outputs a pulse signal P having a frequency corresponding to the rotational speed of the DC brushless motor 5 and a pulse number corresponding to the rotational position. This rotary encoder 54 also enables the origin position to be grasped. More specifically, one that outputs about 2000 pulses / rotation is used,
The accuracy is about several tens of μm.

The power supply circuit 56 is connected between power supply lines of a DC voltage having a voltage of about 280 V rectified by the rectifier circuit 52, converts the high DC voltage into a low control voltage, and outputs a rotor position detector. A DC voltage of about 7 V is supplied to 53, and a DC voltage of about 15 V is supplied to the controller 31.

The drive circuit 50 is for inputting not the detection signal of the Hall sensor but the pulse signal P of the rotary encoder 54 having a large number of output pulses to the controller 31 to perform position feedback control. Thereby, highly accurate positioning control of the traverse device 1 can be performed.

As described with reference to FIG. 1, the rotation detector 15 for detecting the rotation speed of the winding package 11 is also connected to the controller 31.

When the rotating drum 13 is rotating at a substantially constant speed, the peripheral speed of the winding package 11 rotating in contact therewith becomes a substantially constant speed, so that the rotating speed of the winding package 11 gradually increases in diameter. (The rotation speed of the bobbin 10) gradually decreases.

Accordingly, the controller 31 can obtain the diameter of the winding package 11 by detecting the rotation speed of the winding package 11 using the rotation detector 15. That is, the controller 31 controls the cradle pulse C
The package diameter can be calculated based on the frequency of P. The controller 31 controls the reciprocating motion of the traverse guide 4 (forward / reverse driving of the motor 5) so that the winding width becomes a winding width corresponding to the package diameter, whereby a tapered end package having a preset taper angle can be manufactured. .

As described above, the traverse device 1 of the present invention
Since the DC brushless motor 5 is used as the drive motor, high-speed operation is possible, and the drive wheels (drive pulley 6) can be reduced in size. Therefore, the inertia of the rotating body is reduced. Further, by performing position feedback control of the DC brushless motor 5 based on the detection signal of the rotation detector, highly accurate positioning in high-speed operation can be performed.

Since the DC brushless motor 5 hardly vibrates during rotation, good winding can be performed. When the motor current is I, the output torque is T, and the torque constant is Kt, the relation is expressed by T = Kt × I. Since the current value and the output torque are in a proportional relationship, the motor load is calculated from the current value. (Torque) can be monitored. Further, the traverse guide 4 can be satisfactorily braked at the traverse end using the regenerative electric power which can be easily taken out.

In addition to the magnetic sensor as the rotor position detector 53, by using a rotary encoder 54 that outputs hundreds to tens of thousands of pulse signals per rotation as a rotation detector, for example, High-precision positioning control can be performed.

Next, the control by the control device (controller) 31 according to the present invention will be described in more detail.

FIG. 6 is a block diagram showing an example of control of the driving circuit 50 shown in FIG. 5 by the control device 31 (controller).

As shown in FIG. 6, the controller 31
First, the adder 60 adds the position command signal a and the position feedback signal b from the rotary encoder 54, and the position control element 61 generates a position control signal c. The position control element 61 measures the position for each pulse of the position feedback signal b and generates a position control signal c. Next, the adder 62 adds the position control signal c and the speed feedback signal d from the rotary encoder 54, and the speed control element 63 generates the speed control signal e. Speed control element 63
Measures the speed from the pulse interval for each pulse of the position feedback signal b. Then, the adder 64 adds the speed control signal e and the current feedback signal f from the current sensor 55, and the torque control element 65 generates a torque control signal g. The controller 31 generates a pulse signal h in the PWM circuit 66 based on the torque control signal g, and inputs the pulse signal h to the drive circuit 50 to control the DC brushless motor 5.

As described above, the controller 31 performs the current feedback control based on the detection signal of the current detector simultaneously with the position and speed feedback control.

According to the present invention, the speed in the acceleration period and the deceleration period can be made to exactly match the set speed by the speed feedback control. Therefore, the ear height, the ribbon, and the like can be reliably prevented. In addition, the torque feedback proportional to the current value can be controlled by the current feedback control, and even if an excessive load is applied to the motor during high-speed reversal, the motor loses synchronism (the positional relationship between the rotor magnet and the stator coil shifts). ) Can be reliably prevented.

The controller 31 includes the current sensor 5
The abnormality determination is performed based on the change in the current value detected in step 5. Thus, the state of the belt can be monitored based on the change in the current value. For example, the drive belt body 2
Can be detected quickly and reliably.

Rotary encoder 5 as rotation detector
Step 4 is unnecessary when high-precision position control is not required.
For example, when the present invention is applied to a machine that only needs to rotate at a constant speed, the rotation speed of the DC brushless motor 5 may be calculated from the signal of the Hall sensor as the rotor position detector 53.

In this case, the driving circuit 7 shown in FIG.
0 may be used. The drive circuit 70 performs frequency / voltage conversion of the detection signal from the rotor position detector 53 by the F / V converter 71, and determines the magnitude of the voltage and the command speed V as a voltage by the comparator 72, and performs a controller operation. 31 for performing position feedback control by a signal from the Hall sensor.

The example of a single unit (weight) has been described above. Next, an example in which the present invention is applied to a plurality of weights will be described.

FIG. 8 is a driving block diagram showing an example in which the present invention is applied to a plurality of weights.

As shown in FIG. 8, in the driving circuit 80, a common rectifier circuit 81 is connected to a plurality of driving circuits 30a, 30b... Provided for each DC brushless motor 5a, 5b. Further, a motion controller 82 is provided as a control device connected to the drive circuits 30a, 30b,. The motion controller 82 controls at least some of the DC brushless motors 5a, 5b.

Although not shown in the drawing, the yarn winding machine is configured by arranging a plurality of weights side by side. For each weight, one winding package 11 and the traverse device 1 described in FIG.
Is provided. The traverse device 1 for each weight is a single drive motor (DC brushless motor 5a, 5b
…).

When the present invention is applied to a plurality of weights, power consumption can be reduced. For example, when a certain weight is decelerating and another weight is accelerating, the regenerative power R
P can be consumed by another weight via the common DC bus 83. When all the spindles are simultaneously decelerated, the bus voltage increases due to the regenerative power RP and is consumed by the resistor for regenerative power discharge. According to the present invention, such wasteful power consumption can be suppressed.

Here, the control of the forward / reverse drive phase of the DC brushless motor between the two spindles will be described.

FIG. 9 shows an example of control of the forward / reverse drive phase of the DC brushless motor between the two spindles. The horizontal axis represents time (t).
2 is a schematic diagram in which the vertical axis represents the rotation speed (v) of the motor. In the figure, the velocity curve of the upper first weight th and a _1, has a second weight th speed lower curve and a _2. Speaking velocity curve a _1, which corresponds to one traverse from time 0 to time t _8, shows the traversing to either from time 0 to time t ₄ of the right and left, the time t
₄ to time t ₈ indicates the traverse in the other direction. For both the speed curve a ₁ and the speed curve a ₂ ,
The period between the acceleration period and the deceleration period is a constant velocity period.

[0067] As shown in FIG. 9, from the velocity curve a ₂ time 0 to time t ₁ is the deceleration period, the regenerative power RP is generated from the second weight-th DC brushless motor 5b. On the other hand, in the speed curve a ₁ , an acceleration period is from time 0 to time t ₁ , during which the second brushless DC brushless motor 5 b
Is regenerated by the first brushless DC motor 5a via the DC bus 83. By the same for a period of time t ₄ from the time t _5, by effectively using 2 times per traverse the regenerative power RP, power consumption can be suppressed.

Even in the case of a plurality of weights, if the phases of the acceleration and deceleration periods of the weights are appropriately shifted as described above, the regenerative power at the time of deceleration can be consumed by the other accelerated weights.

In the figure, the speed curve a ₁ and the speed curve a ₂
Has been described with an example of a substantially rectangular curve, but the speed change at the transition between the constant speed period and the acceleration / deceleration period is made smooth (the rectangular portion of the speed curve is made a smooth curve portion), so that It is possible to prevent a change in the tension of the yarn due to a change in speed. This is the same for each speed curve in the case of a plurality of weights.

According to the present invention, high-speed operation can be achieved by using a DC brushless motor as the drive motor. This leads to the fact that the traverse device 1 can be realized by the small-diameter drive pulley 6 that cannot be realized by the stepping motor. That is, the motor can be rotated at high speed in the normal and reverse directions, and the apparatus can be reduced in size by rotating the pulley many times to traverse. Also, by using a DC brushless motor, the state of the belt can be monitored because the motor current and the output torque are in a proportional relationship. In the case of a brushless motor, regenerative power can be easily obtained at the time of deceleration in forward / reverse operation, so that an energy saving effect can be obtained.

[0071]

As is apparent from the above description,
According to the present invention, the following excellent effects are exhibited.

(1) Since high-speed operation is possible and the drive wheels (drive pulleys) can be reduced in size, the inertia of the rotating body is reduced, and high-precision positioning in high-speed operation can be performed by position feedback control. Therefore, even when a high-speed traverse is performed, high-precision positioning control of the traverse guide can be performed, and the height of the traverse guide, the winding of the ribbon, and the like can be prevented, and a winding package with good unwinding property can be manufactured. Further, since there is almost no vibration during rotation, better winding can be performed. Since the current value and the torque are in a proportional relationship,
The load (torque) of the motor can be monitored from the current value. The traverse guide can be satisfactorily braked at the end of the traverse by using regenerative electric power which can be easily taken out.

(2) The state of the belt can be monitored based on the change in the current value. For example, it is possible to quickly and reliably detect that the drive belt body has been cut.

(3) By the speed feedback control, the speeds in the acceleration period and the deceleration period can be made to exactly match the set speed. Therefore, it is possible to reliably prevent the ear height, ribbon winding, etc., and to accurately control the winding density (hardness) at both ends in the axial direction of the winding package while reliably preventing the shedding during winding. it can.

(4) The torque which is proportional to the current value can be controlled by the current feedback control, and even if an excessive load is applied to the motor during high-speed reversal, the motor loses synchronism (position between the rotor magnet and the stator coil). Relationship is shifted)
Can be reliably prevented. Therefore, accurate positioning control of the traverse guide can always be maintained.

(5) A high-precision positioning control can be performed by using a rotary encoder that outputs hundreds to thousands of pulse signals per rotation, separately from a magnetic sensor as a rotor position detector. Therefore, the unwinding property of the winding package manufactured by the high-speed traverse can be further improved.

(6) Power consumption can be reduced. For example, when a certain weight is decelerating and another weight is accelerating, regenerative power generated by deceleration can be consumed by another weight via a common DC bus. When all the spindles decelerate at the same time, the bus voltage increases due to the regenerative power and is consumed by the regenerative power discharging resistor. According to the present invention, such useless power consumption can be suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view of a DC brushless motor according to the present invention.

FIG. 3 is a circuit diagram showing a connection relationship between a DC brushless motor, a drive circuit, and a control device (controller) according to the present invention.

FIG. 4 is a simplified circuit diagram of the circuit shown in FIG. 3;

FIG. 5 is a block diagram for driving the DC brushless motor according to the present invention (when high-precision position control is performed).

FIG. 6 is a block diagram illustrating an example of control by a controller of the driving circuit illustrated in FIG. 5;

FIG. 7 is an example of a block diagram for driving the DC brushless motor according to the present invention.

FIG. 8 is a driving block diagram showing an example in which the present invention is applied to a plurality of weights.

FIG. 9 is a schematic diagram illustrating an example of control of a forward / reverse drive phase of a DC brushless motor between two weights.

FIG. 10 is a schematic view of a conventional traverse device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traverse device 2 Drive belt body 4 Traverse guide 5 DC brushless motor

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshito Umehara 136 Takeda-Mukoshiro-cho, Fushimi-ku, Kyoto-shi, Kyoto Prefecture F-term in the headquarters of Murata Machinery Co., Ltd. 3F056 CA05 CB09

Claims (6)

[Claims] 1. A traverse device for traversing a yarn by reciprocating a traverse guide attached to the drive belt body by driving the drive belt body in a forward / reverse direction. A brushless motor, a rotation detector for detecting a rotation position of the DC brushless motor, and a control device for performing position feedback control of the DC brushless motor based on a detection signal of the rotation detector. Traverse device. 2. The traverse device according to claim 1, further comprising a current detector for detecting a value of a current flowing through the motor coil, wherein the control device makes an abnormality determination based on a change in the detected current value. 3. The traverse device according to claim 1, wherein the control device simultaneously performs the position feedback control and the speed feedback control of the DC brushless motor based on the detection signal of the rotation detector. 4. The apparatus according to claim 3, further comprising a current detector for detecting a value of a current flowing through the motor coil, wherein the control device performs the current feedback control based on a detection signal of the current detector simultaneously with the position and speed feedback control. Traverse device. 5. A magnetic sensor as a rotor position detector built in a DC brushless motor, wherein the rotation detector comprises:
The traverse device according to any one of claims 1 to 4, wherein the traverse device is a rotary encoder that outputs a pulse signal having a frequency corresponding to a rotation speed of the DC brushless motor and a pulse number corresponding to a rotation position. 6. A common rectifier circuit is connected to a plurality of drive circuits provided for each DC brushless motor, and the control device controls at least some of the DC brushless motors to have different normal / reverse drive phases. Item 6. The traverse device according to any one of Items 1 to 5.