JP2002338138A - Yarn winder and retardation and stoppage controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn winder accurately retarding a winding drum such as a traverse drum in accordance with set speed and capable of stopping a driving drum. SOLUTION: The winding drum 3 is accurately controlled in accordance with the set speed by providing a rotational speed calculating means 21 detecting a drum pulse of a frequency responding to a rotational speed of the winding drum 3 and calculating the rotational speed of the winding drum apart from a magnetic sensor of a direct current brushless motor 30, and rotational speed control means 26, 27, and 28 controlling drive of the direct current brushless motor 30 on the basis of a calculation result of the rotational speed calculating means 21 and a preset speed set value and controlling speed of the winding drum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn winding machine such as an automatic winder and a deceleration stop control device, and more particularly to a control of a winding drum provided in the yarn winding machine and a control of a DC brushless motor. It relates to deceleration stop control.

[0002]

2. Description of the Related Art In an automatic winder, a yarn unwound from a yarn supplying bobbin is wrapped around a bobbin while traversing to form a cone-shaped or cheese-shaped package. As a means for traversing the yarn in this automatic winder, one in which a traverse groove is formed in a traverse drum that contacts a package and rotationally drives it is known. Attempts have been made to use DC brushless motors instead of induction motors for the purpose of improving efficiency.

[0003]

In such an automatic winder, when a yarn break occurs during winding of the yarn, rewinding is stopped. At that time, it is necessary to rapidly decelerate from a high-speed rotation state of about 7000 to 8000 rpm and maintain the state of zero speed without vibration after a few seconds. After this sudden stop, the relay pipe suctions and catches the yarn end on the yarn supplying bobbin side and introduces it into the piecing device.The suction mouth sucks and captures the yarn end on the package side and introduces it into the piecing device. The piecing device performs piecing. As a preparation process of the piecing, the yarn is pulled out to the piecing device while the winding drum is rotated in reverse to feed the yarn out of the package. At this time, after the winding drum reverses by a predetermined amount, it is necessary to surely maintain the speed at zero after a predetermined time. If the traverse drum vibrates while the yarn is being nipped by the piecing device at the time of this piecing, the yarn is pulled or loosened, and the yarn breaks or the like, so that the reliable piecing process cannot be performed. It is necessary to surely decelerate and stop the traverse drum.

For this reason, a DC brushless motor uses a magnetic sensor provided for detecting a rotor position.
The rotation speed of the DC brushless motor is calculated based on the pulse signal (2 pulses / 1 rotation in the case of 4 poles) from the magnetic sensor, feedback control is performed using the calculated rotation speed, and the traverse drum is decelerated and stopped. It was being attempted to make it happen.

[0005] However, when the rotation speed of the DC brushless motor is low, the number of pulses generated from the magnetic sensor is small. Therefore, it is impossible to accurately detect the rotation speed of the DC brushless motor in a low speed region. As a result, there is a problem that it is difficult to accurately decelerate the traverse drum according to the set speed and to stop the traverse drum reliably.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a yarn winding machine capable of decelerating a winding drum such as a traverse drum accurately according to a set speed and stopping the winding drum. The purpose is to do. It is another object of the present invention to provide a DC brushless motor deceleration stop control device capable of reliably stopping the rotation of the rotor of the DC brushless motor.

[0007]

According to a first aspect of the present invention, there is provided a yarn winding machine including a winding drum, a rotor, a stator coil, and a magnetic sensor for detecting a rotor position. A DC brushless motor for rotating, a rotation speed calculating means provided separately from the magnetic sensor, detecting a drum pulse having a frequency corresponding to the rotation speed of the winding drum, and calculating the rotation speed of the winding drum; A rotation speed control unit that controls the excitation of the DC brushless motor based on the calculation result of the speed calculation unit and a preset speed setting value to control the speed of the winding drum.

With this configuration, the rotation speed of the winding drum is calculated by using a drum pulse in which the number of pulses per rotation of the winding drum is larger than the number of pulses by the magnetic sensor, and the calculated rotation speed of the winding drum is calculated. The excitation of the DC brushless motor is controlled on the basis of the above, thereby controlling the rotation speed of the winding drum. Therefore, the winding drum can be decelerated accurately according to the set speed value. Where the drum pulse is
More than several tens of pulses per revolution, for example, 60 pulses / 1
Use a rotating one. Usually, a drum pulse is used in a yarn winding machine to detect a winding length.
This drum pulse can be used. Further, during steady winding, disturbance control for periodically accelerating and decelerating the rotation speed of the traverse drum based on the rotation speed calculated using the drum pulse is also performed. With this configuration,
In an automatic winder, a DC brushless motor that rotates a winding drum can be stopped from 7000 to 8000 rpm in a few seconds.

According to a second aspect of the present invention, in the first aspect, the rotation speed of the winding drum during deceleration is set to a predetermined brake start speed based on a calculation result by the rotation speed calculation means. Rotation speed determination means for determining whether or not the rotation speed of the winding drum has reached the brake start speed by the rotation speed determination means. Brake control means for performing brake control for alternately switching the direction of a current flowing through the stator coil of the DC brushless motor by three-phase chopping is provided.

With this configuration, the rotational speed determining means is decelerated.
It is determined that the brake start speed has been reached during
Control means flows to the stator coil of the DC brushless motor.
Current is controlled by three-phase chopping,
The winding drum can be substantially stopped. In particular, winding
Since the rotating load of the take-up drum is small, for example, 100 r
When the speed is lower than pm,⁺Cho
Ping, V^-ON, W ^-With the normal short-circuit control of ON
Hunting does not stop accurately,
Brake that alternates flow direction works effectively
You.

According to a third aspect of the present invention, in the second aspect, the brake control means activates the excitation of the DC brushless motor when a predetermined time has elapsed after the start of the brake control. It is characterized by being released.

With this configuration, it is possible to prevent the winding drum from continuing to vibrate, and to stop the winding drum. In a brake using three-phase chopping, vibration may occur at the time of stoppage. However, after the brake control is started, excitation is removed and completely stopped after a preset stop time (for example, 0.5 seconds).

According to a fourth aspect of the present invention, in the second aspect, after the brake control means starts the brake control, a cycle of a pulse detected by the magnetic sensor exceeds a predetermined time. And the excitation of the DC brushless motor is released.

According to this configuration, the continuation of the vibration of the winding drum can be prevented, and the winding drum can be stopped.

According to a fifth aspect of the present invention, there is provided a deceleration stop control device comprising: a rotor;
A DC brushless motor having a stator coil and a magnetic sensor for detecting a rotor position; a rotation speed calculation unit for calculating a rotation speed of the rotor of the DC brushless motor; and a deceleration based on a calculation result by the rotation speed calculation unit. A rotation speed determination unit that determines whether the rotation speed of the rotor of the DC brushless motor has reached a preset brake start speed; and a calculation result of the rotation speed calculation unit and a preset speed setting. Rotation control means for controlling the excitation of the DC brushless motor on the basis of the value to control the speed of the rotor. When it is determined that the speed has been reached, the current flows through the stator coil of the DC brushless motor by three-phase chopping. Characterized by comprising a brake control means for performing brake control for switching alternately the direction of the current that.

With this configuration, after the rotation speed of the rotor is reduced to the brake start speed during the deceleration of the rotor, the direction of the current flowing through the stator coil of the DC brushless motor is controlled by three-phase chopping. It is possible to substantially stop the drum.

According to a sixth aspect of the present invention, there is provided a deceleration stop control apparatus according to the fifth aspect.
In the rotation speed calculation means, the rotation speed of the rotor used for the determination by the rotation speed determination means, based on the time interval between one pulse of the frequency of the pulse according to the rotation speed of the rotor, It is characterized in that it is calculated.

According to this configuration, the timing at which the brake control is started is determined by using the rotation speed of the rotor calculated based on the time interval between one pulse of the frequency corresponding to the rotation speed of the rotor. The variation in the start timing that occurs when the timing for starting the brake control is determined using the rotation speed (average value) of the rotor calculated based on the plurality of time intervals is eliminated,
The rotation of the rotor can be stopped almost exactly within a predetermined time.

According to a seventh aspect of the present invention, there is provided a deceleration stop control apparatus according to the fifth aspect.
Alternatively, in claim 6, the duty ratio of each phase of the three-phase chopping is set to a fixed value.

For example, as a fixed value of the duty ratio, approximately 50
When% is used, the on-state and the off-state of each of the three phases are balanced, the vibration of the rotor is suppressed, and the rotor can be completely stopped reliably within a required time.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An automatic winder as a yarn winding machine according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a device configuration of an automatic winder unit, and FIG. 2 is a functional block diagram showing a functional configuration of a control circuit of the automatic winder unit.

The unit 1 of the automatic winder shown in FIG.
The yarn Y unwound from one or many yarn supplying bobbins E is wrapped around the bobbin Bf while being traversed to form a cone-shaped package P with fixed length winding. A plurality of such automatic winder units 1 are arranged in parallel to constitute one automatic winder.

The unit 1 of the automatic winder includes a cradle 2 for holding the bobbin Bf, and a traverse drum 3 for traversing the yarn Y. The cradle 2 pivots toward the traverse drum 3 or vice versa, whereby the bobbin Bf (package P) comes into contact with the traverse drum 3,
Be separated. The traverse drum 3 is provided on the side frame 4 and has a spiral traverse groove 3a for traversing the yarn Y on its surface. The traverse drum 3 is driven to rotate by a DC brushless motor 30. That is, the rotation of the traverse down drum 3 causes the yarn Y to traverse the traverse groove 3a.
And the package P is reciprocated in the axial direction of the package P.

The rotation speed of the traverse drum 3 is detected by inputting a drum pulse generated by a rotation detector 3b to a control circuit 11 described later. The drum pulse is a pulse signal having a frequency corresponding to the rotation speed of the traverse drum 3. The traverse drum 3 rotates the package P by frictional contact during winding of the yarn Y. This traverse drum 3
Is connected to the DC brushless motor 30 via a coupling, or connected to the DC brushless motor 30 via a pulley and a belt. Further, the drive shaft of the traverse drum 3 and the drive shaft of the DC brushless motor 30 may be shared, and the DC brushless motor 30 may be directly connected to the traverse drum 3.

The unit 1 of the automatic winder includes a tensor 5 (tension applying device), a slab catcher 6 (a yarn) in a yarn traveling path between the yarn supplying bobbin E and the traverse drum 3 from the yarn supplying bobbin E side. Thickness detector) and piecing device 7
Is arranged. The tensor 5 applies a predetermined tension to the traveling yarn Y. Slab Catcher 6
Is for detecting a thickness defect of the yarn Y, and has a function of cutting the yarn Y. Above the slab catcher 6, a traverse fulcrum guide 8 serving as a traverse fulcrum is provided. The yarn splicing device 7 splices a yarn end on the package P side and a yarn end on the yarn supplying bobbin E when a yarn break occurs during rewinding. Reference numeral 9 denotes a relay pipe supported by the side frame 4 as lower thread guide means, and reference numeral 10 denotes a suction mouth supported by the side frame 4 as upper thread guide means. The relay pipe 9 sucks and catches the yarn end on the yarn supplying bobbin E side after the yarn breakage, and introduces the yarn end into the yarn joining device 7. The suction mouse 10, after the thread breaks,
The yarn end on the package P side is suctioned and caught and introduced into the piecing apparatus 7. Note that the positions of the slab catcher 6 and the piecing device 7 may be interchanged so that the slab catcher 6 is disposed downstream (upper) of the piecing device 7.

At the time of piecing, the traversing drum 3 (winding drum) is reversed in a state where the suction mouth 10 (upper thread guide means) is close to the package P, so that the yarn of the package P is transferred to the suction mouth 10 (upper thread). Thread guide means)
After that, the suction mouth 10 (upper thread guide means) is moved (turned) to draw out the thread to the splicing device 7. At the same time, the yarn of the yarn supplying bobbin E is captured by the relay pipe 9 (lower yarn guide means), and the relay pipe 9 (lower yarn guide means) is moved (turned) to pull out the yarn to the yarn joining device 7. Thereafter, in the piecing device 7, the upper thread and the lower thread are spliced using the swirling airflow. Specifically, when the amount of reverse rotation of the traverse drum 3 (winding drum) reaches a predetermined amount, when the reverse rotation is stopped, the drawn yarn is held substantially simultaneously in the piecing device 7 and the swirling air flow is injected. Perform the piecing.

Referring to FIG. 2, the configuration of the speed control of the DC brushless motor 30 by the control circuit 11 will be described. DC brushless motor 30 is connected to power circuit A,
The control circuit 11 is connected to the power circuit A.

The DC brushless motor 30 includes a rotor (rotor) 30a composed of a permanent magnet, a stator coil (stator) 30b, a magnetic sensor (Hall sensor or Hall IC) 30c for detecting the position of the rotor, and a speed control. And a rotation detector 3b. As shown in FIG. 3, the power circuit A includes a plurality of transistors 31 to 36 (switching elements) connected in a three-phase bridge.
Although not shown, a reflux diode is connected to each of the transistors 31 to 36 in anti-parallel.

The magnetic sensor 30c is for detecting the timing of waveform switching, and outputs a pulse signal (hole detection signal) having a frequency corresponding to the rotation speed of the rotor 30a while the DC brushless motor 30 is rotating. . 4
In the case of the pole DC brushless motor 30, two pulses are output in one rotation. The control circuit 11 performs switching control (waveform switching) of the energized phase of the stator coil 30b by switching a drive signal for the power circuit A based on a pulse signal from the magnetic sensor 30c.

The rotation detector 3b is a magnetic or optical rotary encoder provided on the rotation shaft of the traverse drum 3 or the rotor 30a of the DC brushless motor 30,
One rotation of the rotation shaft generates several tens or more pulses, for example, 60 pulses, and outputs the generated pulses to a rotation speed calculation unit 21 of the control circuit 11 described later.

The control circuit 11 calculates the speed
It controls the rotation of the DC brushless motor 30 and adjusts the duty ratio to adjust the power (torque) supplied to the DC brushless motor 30. That is, the control circuit 11 sets the transistors 31 to 36 to PWM.
The rotation speed of the DC brushless motor 30 is controlled by energization.

The control circuit 11 comprises a unit controller and a motor driver and is provided in a control device for controlling the operation of the entire unit 1 of the automatic winder. As shown in FIG. (1) Acceleration control including disturb at start (t0 to t1),
(2) Constant speed control including disturbance during steady winding (t1
~ T2), (3) Deceleration control at the time of thread breakage (t2 ~ t3 ~
Perform t4).

The control circuit 11 includes a disturbance setting unit 23, a speed comparator (rotation speed control means) 26, a PI
D control unit 27, duty ratio calculation unit (brake control unit) 28, rotation speed calculation unit (rotation speed calculation unit) 21
And a rotation speed determination unit (rotation speed determination unit) 22. Each function of the control circuit 11 described below is mainly realized by a central processing unit such as a CPU.

The disturb setting section 23 controls the control circuit 11
The speed setting value a 'including the disturbance (variation) of several percent above and below is formed on the basis of the speed setting value a with respect to.
The rotation speed calculation unit 21 sets the time interval between the drum pulses a plurality of times (for example, 10 times) based on the detection signal of the rotation detector 3b.
Times), the rotation speed (average value) of the DC brushless motor 30 is calculated based on the time interval, and the rotation speed signal b is output. Further, the rotation speed calculation unit 21 measures the time interval between the drum pulses once based on the detection signal of the rotation detector 3b, and calculates the rotation speed of the DC brushless motor 30 based on the one time interval. , And outputs a rotation speed signal b ′. The speed comparator 26 calculates the difference between the speed set value a 'and the rotation speed signal b, and outputs a difference signal c. PID control unit 27 and duty ratio calculation unit 28
Calculates a duty ratio by performing a PID calculation based on the deviation amount signal c. Further, a magnetic sensor 30c is connected to the duty ratio calculator 28. The duty ratio calculation unit 28 outputs a drive signal d (PWM waveform signal) which becomes the calculated duty ratio and switches at a timing synchronized with the detection signal of the magnetic sensor 30c. The control circuit 11 is connected to the motor 30 via a power circuit A (power module).
Switches the switching element. By this switching, the current to the stator coil 30b of the motor 30 is switched. As described above, the control circuit 1
1, the speed feedback of the DC brushless motor 30 (traverse drum 3) is performed.

In FIG. 4, at the start, for example, t0
When accelerating to the rotation speed r1 (7000 rpm) in 5 seconds up to t1, the speed is raised to a predetermined speed (7000 rpm) within a set time (5 seconds) while periodically accelerating or decelerating (disturbing) the speed by the above-described speed feedback control. . At the time of steady winding in which the average speed is maintained at the rotation speed r1 (t1
Also in ~ t2), disturbance control for periodically accelerating / decelerating the rotational speed is performed.

When the slab catcher 6 detects a yarn defect and cuts the yarn, or when the winding amount of the package P reaches the full winding amount and cuts the yarn, the control circuit 11 controls the direct current. The deceleration control of the brushless motor 30 is performed from the steady rotational speed r1 according to the set pattern. During the deceleration of the motor 30 (t2 to t4), the control circuit 11 sets a predetermined brake start rotation speed r2 (hereinafter referred to as a brake start speed) in which the rotation speed of the traverse drum 3 is set in advance.
, The speed feedback control is performed while detecting the rotation speed of the traverse drum 3 based on the drum pulse of the rotation detector 3b.

The control circuit 11 controls the traverse drum 3
When the rotation speed of the DC brushless motor 30 reaches a brake start speed r2 of, for example, 100 rpm, the stator coil 30b of the DC brushless motor 30 is subjected to three-phase chopping (see FIG. 5).
The direction in which the current flowing through the
μs), and performs brake control for alternately switching. After a predetermined time (hereinafter referred to as a stop time) elapses after starting such a brake control, the excitation of the DC brushless motor 30 is released,
The deceleration stop control of the traverse drum 3 is ended.

The deceleration period (t) of the DC brushless motor 30
From 2 to t3), deceleration control is performed by the above-described speed feedback control so that the set speed pattern is obtained. The rotation speed determination unit 22 that has received the rotation speed signal b ′ from the rotation speed calculation unit 21 detects whether the rotation speed has reached the brake start speed r2 based on the rotation speed signal b ′. When it is detected that the brake start speed r2 has been reached, a brake start signal f is output to the duty ratio calculator 28. Upon input of the brake start signal f, the duty ratio calculation unit 28 outputs a drive signal d for switching the direction of the current flowing through the stator coil 30b of the DC brushless motor 30 to the power circuit A by three-phase chopping at predetermined intervals. . The duty ratio calculator 28 ignores the detection signal from the magnetic sensor 30c, that is, the position of the rotor 30a, and switches the direction of the current flowing through the stator coil 30b of the DC brushless motor 30 by three-phase chopping in synchronization with the carrier cycle. Perform control. The duty ratio calculation unit 28 continuously performs the brake control during a preset stop time, and stops the output of the drive signal d to the power circuit A when the stop time elapses.

The switching of the direction of the current flowing through the stator coil 30b of the DC brushless motor 30 during the brake control will be described below with reference to FIGS. 3 and 5 show the DC brushless motor 3.
FIG. 10 is an explanatory diagram for describing switching control of a direction of a current flowing through a zero stator coil 30b.

Connected to the motor winding (stator coil 30b)
The connected power circuit A has a plurality of switching elements.
Transistors 31 to 36 are provided. U-phase upper arm
(U ⁺), The V-phase upper arm (V⁺) No
Transistor 32, W-phase upper arm (W⁺) Transistor
33 collectors are connected to each other.
Arm (U-) transistor 34, V-phase lower arm (V
-) Transistor 35, W-phase lower arm (W-)
Each emitter of the transistor 36 is connected to each other.
Then, for each phase, the positive voltage side (upper arm side)
And the transistor on the negative voltage side (lower arm side)
Each is connected in series.

The emitter of the transistor 31, the collector of the transistor 34, and the U terminal of the DC brushless motor 30 are connected. Further, the emitter of the transistor 32, the collector of the transistor 35, and the DC brushless motor 3
0 V terminal is connected. Further, the transistor 33
, The collector of the transistor 36, and the W terminal of the DC brushless motor 30 are connected.

In the brake control, one of the switching elements on either the positive voltage side (upper arm side) or the negative voltage side (lower arm side) is turned on (on) and the other switching element is turned on. A first switching pattern in which two switches are turned on (on);
In the switching pattern, one of the switching elements on the side (positive voltage side or negative voltage side) where the two switching elements were energized (on state) is energized (on state), and in the first switching pattern Only one switching element is energized (ON state)
And the second switching pattern in which two of the switching elements on the side (negative voltage side or positive voltage side) are turned on (on). The direction of the current flowing through the stator coil 30b is alternately switched by such three-phase chopping. At the time of energization switching during motor driving, control is performed so that the upper arm transistor and the lower arm transistor of each phase are not simultaneously energized (ON state).

In the example of the brake control shown in FIG.
1 is maintained in the first switching pattern, and time T2 is maintained in the second switching pattern. The duty ratio is the ratio of the time during which the transistor is energized to the time during which the transistor is not energized, that is, T1 / (T1 + T2). During the brake control, the duty ratio by switching the energization of each transistor is maintained at a fixed value. The fixed value is approximately 50
By setting the percentage, the energized state and the non-energized state of each phase can be balanced, and the DC brushless motor 30 can be reliably stopped without shaking for a required time. In the example shown in FIG. 5, in the first switching pattern, the V-phase lower arm (V ⁻ ) 35, which is one of the transistors 34, 35, and 36 on the negative voltage side, is turned on, and , The U-phase upper arm (U ⁺ ) 31 and the W-phase upper arm (W ⁺ ) 33, which are two of the transistors 31, 32, and 33, are in a conductive state. In the second switching pattern, the positive voltage side transistor 31,
V-phase upper arm (V ⁺ ) 3 which is one of 32 and 33
2 is energized, and the U-phase lower arm (U) of two of the transistors 34, 35, 36 on the negative voltage side
⁻ ) 34 and the W-phase lower arm (W ⁻ ) 36 are in the energized state. In the brake control, such switching between the first switching pattern and the second switching pattern is performed in synchronization with the carrier cycle.

In the case of the first switching pattern, a current flows from the U terminal and the W terminal to the V terminal in the stator coil 30b (in the direction of the dotted arrow in FIG. 3). From the V terminal to the U terminal and W
A current flows to the terminal (in the direction of the solid arrow in FIG. 3). or,
As long as the direction of the current flowing through the stator coil 30b of the DC brushless motor 30 can be alternately switched, three-phase chopping other than the above combination may be used.

Next, the deceleration stop control of the traverse drum 3 in the unit 1 of the automatic winder shown in FIG. 1 will be described. When the yarn winding in the automatic winder 1 is started, the yarn feeding bobbin is started.
The yarn Y unwound from E travels through the tensor 5, the slab catcher 6, and the traverse fulcrum guide 8, and is rewound into the package P while being traversed by the rotating traverse drum 3.

When the yarn Y breaks during this rewinding, the control circuit 11 starts the deceleration stop control of the traverse drum 3. The rotation speed calculation unit 21 detects the drum pulse from the rotation detector 3b, calculates the rotation speed of the traverse drum 3 based on the detection result, and outputs a rotation speed signal b using the calculation result as information.
And the rotation speed signal b ′ are output to the speed comparator 26 and the rotation speed determination unit 22, respectively.

Since the rotation speed of the traverse drum 3 is equal to or higher than the brake start speed at the beginning of the deceleration stop control of the traverse drum 3, the rotation speed determination unit 22
Traverse drum 3 indicated by rotation speed signal b 'input from
It is determined that the rotation speed is not lower than the brake start speed.
Then, deceleration control is performed by feedback control based on the deviation amount between the speed setting value a ′ along the deceleration pattern (t2 to t4) in FIG. 4 and the rotation speed signal b from the rotation speed calculation unit 21. That is, the duty ratio calculator 23 calculates the duty ratio based on the calculated deviation amount, and the drive signal d is output from the duty ratio calculator 23 to the power circuit A. In the power circuit A, the switching element is driven by the drive signal d. The excitation of the DC brushless motor 30 is controlled by the switching. Through this series of controls, the rotation speed of the traverse drum 3 is reduced to the brake start speed r2.

When the rotation speed of the traverse drum 3 is reduced to the brake start speed r2 by the above series of controls, the rotation speed determination unit 22 determines the traverse indicated by the rotation speed signal b ′ input from the rotation speed calculation unit 21. It is determined that the rotation speed of the drum 3 is equal to or lower than the brake start speed r2. Then, the brake start signal f is output from the rotation speed determination unit 22 to the duty ratio calculation unit 28, and the duty ratio calculation unit 28
Brake control for alternately switching the direction of the current flowing through the stator coil 30b of the DC brushless motor 30 in synchronization with the carrier cycle by three-phase chopping, an example of which is shown in FIG. 5, is performed. By this brake control, the traverse drum 3 is substantially stopped from the high-speed rotation in a short time.

Such a brake control is stopped when a preset stop time elapses, and the excitation of the DC brushless motor 30 is released.

As described above, according to the automatic winder 1 of this embodiment, instead of using the pulse (in the case of 4 poles: 2 pulses / 1 rotation) by the magnetic sensor built in the DC brushless motor, the drum pulse (60 pulses) is used. / 1 rotation), the rotation speed of the traverse drum 3 is detected, so that the rotation speed can be accurately detected even in a low-speed range, and the traverse drum 3 (DC brushless motor) can be accurately detected according to the target speed. The rotation speed of the 30 rotors 30a) can be reduced.

When the rotation speed of the traverse drum 3 becomes equal to or lower than the brake start speed r2, the brake control for alternately switching the direction of the current flowing through the stator coil 30b of the DC brushless motor 30 by three-phase chopping is performed. As a result, the traverse drum 3 can be reliably brought into a substantially stopped state. Further, after the brake control is started, the brake control is continuously performed until a preset stop time elapses. When the stop time elapses, the excitation of the DC brushless motor 30 is released.
The vibration of the (rotor 30a of the DC brushless motor 30) can be suppressed, and the traverse drum 3 (the rotor 30a of the DC brushless motor 30) can be completely stopped reliably.

Further, since the timing at which the brake control is started is determined by using the rotation speed of the DC brushless motor 30 calculated based on the time interval between one drum pulse, a plurality of drum pulses are output. Variations in the start timing that occur when the brake control start timing is determined using the rotation speed (average value) of the DC brushless motor 30 calculated based on the time interval are eliminated, and the traverse drum 3 (DC brushless The rotation of the rotor 30a) of the motor 30 can be stopped almost exactly within a predetermined time.

Here, the above-described embodiment can be modified and implemented as follows. (1) The brake control is described as an example in which the brake is stopped after a preset stop time elapses and the excitation of the DC brushless motor 30 is released. However, the cycle of the pulse detected by the magnetic sensor 30c is changed. When the time exceeds a preset time, the brake control may be stopped and the excitation of the DC brushless motor 30 may be released.

(2) Regardless of the rotation speed of the traverse drum 3 at the start of deceleration stop, the above-described brake control is performed when the rotation speed of the traverse drum 3 reaches the brake start speed during deceleration. The control content after the rotation speed of the traverse drum 3 reaches the brake start speed during deceleration may be changed according to the rotation speed of the traverse drum 3 at the start of deceleration stop. For example, the rotation speed at the start of the deceleration stop of the traverse drum 3 is a predetermined rotation speed (for example, 10 rotations).
When the rotation speed of the traverse drum 3 is equal to or less than the predetermined rotation speed when the rotation speed of the traverse drum 3 is equal to or less than the predetermined rotation speed, the rotation speed of the traverse drum 3 at the start of deceleration is equal to or higher than the predetermined rotation speed. When the rotation speed of the traverse drum 3 reaches the brake start speed during deceleration, the free-run can be performed without performing the above-described brake control.

The embodiment described above can be modified and implemented as follows. (1) Although the automatic winder has been described as an example of the yarn winding machine, the present invention can be applied to various winding machines such as a draw false twisting machine having a single-mass driven yarn winding mechanism. Further, the winding drum is not limited to the traverse drum, but may be provided with a separate traverse device as long as it is a friction type drum.

(2) The deceleration and stop control of the traverse drum when the DC brushless motor is applied to an automatic winder has been described. Applicable.

Further, technical ideas other than the claims that can be grasped from the above-described embodiment will be described together with their effects. (A) In claim 2, the brake control means for performing the brake control for alternately switching the current flowing through the stator coil 30b of the DC brushless motor 30 by three-phase chopping is provided by a magnetic sensor 30c for detecting the rotor position of the DC brushless motor 30. Ignoring the pulse signal (detection signal), the current direction is switched for each carrier cycle based on the carrier signal for generating the PWM waveform.
Since the carrier cycle is shorter than the pulse cycle of the detection signal from the magnetic sensor 30c, stop control with less vibration can be performed.

(B) In the first aspect, disturb means for periodically accelerating and decelerating the rotation speed of the winding drum based on the rotation speed calculated by the rotation speed calculation means during steady winding is provided. is there. More reliable prevention of ribbon winding can be achieved using drum pulses.

[0059]

In the yarn winding machine according to the first aspect of the present invention, the rotation speed of the winding drum is calculated by using a drum pulse in which the number of pulses generated per rotation of the winding drum is larger than that of the magnetic sensor. Since the excitation of the DC brushless motor is controlled based on the calculated rotation speed of the winding drum to control the speed of the winding drum, the winding drum can be accurately decelerated in accordance with the set speed. Further, control such as disturbance control can be performed based on the rotation speed calculated using the drum pulse.

Further, in the yarn winding machine according to claim 2 of the present invention,
When the rotation speed of the winding drum falls below the brake start speed, brake control is performed to switch the direction of the current flowing through the stator coil of the DC brushless motor alternately by three-phase chopping. Can be

Further, in the yarn winding machine according to the third aspect of the present invention, when the predetermined time elapses after the start of the brake control, the excitation of the DC brushless motor is released, so that the winding drum Can be prevented from continuing and the winding drum can be stopped more reliably.

Further, in the yarn winding machine according to a fourth aspect of the present invention, when the pulse period detected by the magnetic sensor exceeds a predetermined time after the brake control, the DC brushless motor is excited. Since it has been released,
Continuation of the vibration of the winding drum can be prevented, and the winding drum can be stopped more reliably.

According to a fifth aspect of the present invention, after the rotation speed of the rotor is reduced to the brake start speed during the deceleration of the rotor, the direction of the current flowing through the stator coil of the DC brushless motor is changed by three-phase chopping. , The winding drum can be substantially stopped.

In the deceleration stop control device according to a sixth aspect of the present invention, the brake control is performed by utilizing the rotation speed of the rotor calculated based on the time interval between one pulse of the frequency corresponding to the rotation speed of the rotor. Since the start timing is determined, variations in the start timing can be suppressed, and the rotation of the rotor can be stopped almost accurately within a predetermined time.

In the deceleration stop control device according to the seventh aspect of the present invention, when approximately 50% is used as the fixed value of the duty ratio, the on-state and the off-state of each of the three phases are balanced, and the vibration of the rotor is reduced. And the rotor can be completely and completely stopped within a required time.

[Brief description of the drawings]

FIG. 1 is a front view showing a device configuration of a unit of an automatic winder.

FIG. 2 is a functional block diagram illustrating functions of a control circuit of a unit of the automatic winder.

FIG. 3 is an explanatory diagram for explaining switching control of an energization pattern for a DC brushless motor.

FIG. 4 is a graph showing a speed control pattern.

FIG. 5 is a diagram illustrating an example of three-phase chopping.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 automatic winder 2 cradle 3 traverse drum (winding drum) 3 b rotation detector 4 side frame 5 tensor 6 slab catcher 7 piecing device 8 traverse fulcrum guide 9 relay pipe (lower thread guide means) 10 suction mouth (upper thread) Guide unit) 11 Control circuit 21 Rotation speed calculation unit (Rotation speed calculation unit) 22 Rotation speed determination unit (Rotation speed determination unit) 23 Disturb setting unit 26 Speed comparator (Rotation speed control unit) 27 PID control unit 28 Duty ratio calculation Section (brake control means) 30 DC brushless motor 30c Magnetic sensor A Power circuit a, a 'Speed set value r2 Brake start speed

Claims (7)

[Claims] A DC brushless motor having a winding drum, a rotor, a stator coil, and a magnetic sensor for detecting a rotor position, the DC brushless motor rotating the winding drum; and a winding motor provided separately from the magnetic sensor. A rotation speed calculating unit that detects a drum pulse having a frequency corresponding to the rotation speed of the drum and calculates the rotation speed of the winding drum; and the rotation speed calculation unit calculates the rotation speed based on a calculation result and a preset speed setting value. A winding speed control means for controlling the excitation of the DC brushless motor to control the speed of the winding drum. 2. A rotational speed determining means for determining whether or not the rotational speed of the winding drum during deceleration has reached a preset brake start speed, based on a calculation result by the rotational speed calculating means. Wherein the rotation speed control means flows to the stator coil of the DC brushless motor by three-phase chopping when the rotation speed determination means determines that the rotation speed of the winding drum has reached the brake start speed. The yarn winding machine according to claim 1, further comprising: a brake control unit that performs a brake control that alternately switches a direction of a current. 3. The yarn according to claim 2, wherein the brake control means releases the excitation of the DC brushless motor when a predetermined time has elapsed after the start of the brake control. Strip winder. 4. The apparatus according to claim 1, wherein the brake control means cancels the excitation of the DC brushless motor when a period of a pulse detected by the magnetic sensor exceeds a predetermined time after the start of the brake control. The yarn winding machine according to claim 2. 5. A DC brushless motor having a rotor, a stator coil, and a magnetic sensor for detecting a rotor position, a rotation speed calculation unit for calculating a rotation speed of the rotor of the DC brushless motor, and a calculation by the rotation speed calculation unit. A rotation speed determination unit configured to determine whether a rotation speed of the rotor of the DC brushless motor during deceleration has reached a preset brake start speed, based on a result, and a calculation result of the rotation speed calculation unit. And rotation control means for controlling the excitation of the DC brushless motor based on a preset speed set value to control the speed of the rotor. If it is determined that the rotation speed of the DC brushless motor has reached the brake start speed, the DC brushless motor is driven by three-phase chopping. Deceleration stop control device being characterized in that a brake control means for performing brake control for switching alternately the direction of the current flowing through the stator coil. 6. The rotation speed calculation means converts the rotation speed of the rotor used for the determination by the rotation speed determination means to a time interval between one pulse of a frequency corresponding to the rotation speed of the rotor. The deceleration stop control device according to claim 5, wherein the calculation is performed based on the calculation. 7. The deceleration stop control device according to claim 5, wherein a duty ratio of each phase of the three-phase chopping is set to a fixed value.