JP3353362B2 - Loom driving method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a star connection circuit for driving a loom drive motor with a commercial power supply at the time of starting the loom, and thereafter driving the loom drive motor by a frequency conversion circuit to excite the loom drive motor at a rated rate. The present invention also relates to a driving method and an apparatus for a loom having an openable and closable delta connection circuit for overexciting a loom driving motor.

[0002]

BACKGROUND OF THE INVENTION This type of loom of the drive unit is Utility Model 61 -
It disclosed in 9 0877 JP. In this drive device, the loom drive motor is started with a commercial power supply at the initial stage of the start of the loom, and the loom drive motor is driven by the variable frequency type inverter when the rotational speed of the loom reaches the set rotational speed. I have. When the loom drive motor is driven by a commercial power supply, a delta connection circuit is formed to over-excit the loom drive motor. When the loom drive motor is driven by the inverter, a star connection circuit is formed to excite the loom drive motor at a rated rate. Driving the loom drive motor with the inverter during normal operation enables the rotational speed of the loom to be changed as necessary.

[0003] The combined use of the commercial power supply and the delta connection circuit results in overtorque several times the rated torque of the loom drive motor due to the rated excitation in the combined use of the inverter and the star connection circuit. Due to the occurrence of such over-torque, the beating force immediately after the start of operation is increased to the same level as the beating force in the steady operation, and the weaving step caused by the insufficient beating force immediately after the start of operation is prevented. I have.

If overexcitation is performed by the delta connection circuit, the loom rotation speed reaches the set rotation speed after one revolution of the loom,
Therefore, the beating force immediately after the start of the operation is increased to the same level as the beating force during the steady operation. Therefore, the switching from overexcitation to rated excitation is performed when the rotating state of the loom reaches a state that provides a beating force that is substantially equal to the beating force during steady operation. If the switching timing is delayed, the beating force immediately after the start of the operation becomes too strong, causing a thick step, or a thin step occurs when the drop in torque due to the switching and the beating time overlap. Conversely, if the switching timing is too early, the beating force immediately after the start of operation becomes weak, and a thin section occurs.

[0005]

The output from the inverter is started after switching to the star connection circuit. Switching from applying the commercial power supply to the delta connection circuit to applying the inverter to the star connection circuit may cause a loom rotation fluctuation. One of the causes is that the output frequency from the inverter is not appropriate. Typically,
The load on the loom drive motor causes the loom drive motor to slip. Therefore, in order to obtain a desired loom rotation speed, a frequency higher than the theoretical output frequency corresponding to this rotation speed must be set. However, the load on the loom drive motor is not constant due to differences in weaving conditions and the like, and it is difficult to properly set the output frequency.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a decrease in the rotational performance of a loom when shifting from a commercial power supply to a frequency conversion circuit, while ensuring a good start-up characteristic which affects the generation of a weaving step. .

[0007]

According to the present invention, when the loom is started, the loom drive motor is driven by a commercial power supply, and thereafter, the loom drive motor is driven by the frequency conversion circuit to start the loom.
Delta connection circuit for overexciting the loom drive motor during running
To excite the rated value of the loom drive motor during road and steady operation
For looms equipped with openable and closable star connection circuits,
A commercial power switch for turning on and off the commercial power to the loom drive motor, a rotational speed detecting means for detecting the rotational speed of the loom, a detected rotational speed obtained from the rotational speed detecting device and a preset rotational speed based on a comparison between, switching from delta connection circuit to the star connection circuit
Then , switch the commercial power switch from the closed state to the open state .
Switching control means for controlling the switching to use of the frequency conversion circuit, and driving the loom by the output of the frequency conversion circuit.
During steady-state operation of the motor is driven, stores the output frequency of the frequency conversion circuit corresponding to the weaving machine rotating speed that is detected by the rotation speed detecting means, the normal operation and the set rotation speed in the next operation of the loom next loom luck frequency obtained by multiplying the output frequency to the memory to the ratio between the rotational speed of the loom when
A drive device comprising frequency conversion circuit output control means for controlling the output from the frequency conversion circuit so as to output the signal at the time of rotation .

[0008]

The switching control means compares the detected rotation speed of the loom obtained from the rotation speed detection means with a preset rotation speed. When the detected rotation speed reaches the set rotation speed, the switching control means switches from the delta connection circuit to the star connection circuit, and then switches the commercial power switch from the closed state to the open state to switch to the use of the frequency conversion circuit . The frequency conversion circuit output control means outputs from the frequency conversion circuit to the star connection circuit in the closed state based on the star connection circuit close detection information.

The output control means of the frequency conversion circuit stores the output frequency of the frequency conversion circuit corresponding to the number of revolutions of the loom during steady operation. The frequency conversion circuit output control means instructs the output frequency to the frequency conversion circuit, and the frequency conversion circuit multiplies the stored output frequency by the ratio between the set rotation speed in the next loom operation and the loom rotation speed in the steady operation. The output from the frequency conversion circuit is controlled so that the output frequency is output at the next operation of the loom .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
A description will be given based on FIG. FIG. 1 schematically shows a side view of the entire loom. M is a three-phase induction motor type loom driving motor, and 1 is a feed motor independent of the loom driving motor M. Numeral 2 denotes a warp beam rotated by the operation of the feed motor 1. A warp T sent from the warp beam 2 passes through a back roller 3 and a tension roller 4 and has a heald 5, a reed 6, and a weft insertion device (not shown). It is guided to the forming device side. The woven cloth W is woven with an expansion bar 7, a surface roller 8, and a press roller 9.
And is wound up on the cross roll 10.

The tension roller 4 is a tension lever 1
1 is attached to one end of the tension lever 1
The tension is applied to the warp T by a tension applying spring 12 attached to the other end of the thread 1. The tension lever 11 is rotatably supported at one end of the detection lever 13, and a load cell 14 is connected to the other end of the detection lever 13. Warp tension is the tension roller 4 is transmitted to the load cell 14 through the tension lever 11 and detecting lever 13, load cell 14 outputs an electric signal corresponding to the warp tension to the loom control computer C _0. The loom control computer C ₀ controls the rotational speed of the detected motor 1 feed based on the tension information from the load cell 14, the warp tension control during weaving is performed.

The loom drive motor M is connected to the O
N causes the primary windings CL ₁ , CL ₂ , CL ₃ to form a delta connection circuit configuration, and the electromagnetic contactor 16 to turn on to form a star connection circuit configuration. A driving device 18 is interposed between the commercial power supply 17 and the loom driving motor M.

FIG. 2 shows the internal structure of the driving device 18. An electromagnetic contactor 19 is interposed on the commercial power supply output lines L ₁ , L ₂ and L ₃ . In any of the configurations of the delta connection circuit and the star connection circuit, the electromagnetic contactor 19 is
If N, the starting voltage of the commercial power supply 19 becomes primary winding CL ₁ , C
Applied between L ₂ and CL ₃ .

Frequency conversion lines L ₄ , L ₅ , L ₆ are connected in parallel to the output lines L ₁ , L ₂ , L ₃ . A frequency conversion circuit 2 is provided on the frequency conversion lines L ₄ , L ₅ and L _6.
0 is interposed. The frequency conversion circuit 20 and driving circuit 21 is electrically connected to the drive circuit 21 is the signal connected to the rotation control computer C _1. The rotation control computer C ₁ phase detection circuit 22 is a signal connection. The phase detection circuit 22 detects the phase on the output side of the electromagnetic contactor 19 on the output lines L ₁ , L ₂ , L ₃ and outputs this phase detection information to the rotation control computer C ₁ .
The rotation control computer C ₁ controls the output of the frequency conversion circuit 20 via the drive circuit 21 based on the phase detection information.

The phase detection circuit 22 includes diodes D ₁ , D
₂ , D ₃ , photocouplers F ₁ , F ₂ , F ₃ and a DC power supply E. If the inter-phase output voltage on the output lines L ₁ , L ₂ , L ₃ is negative, the photocoupler F ₁ ,
F ₂ and F ₃ output signals that cancel the output of the DC power supply E. When the output voltages on the output lines L ₁ , L ₂ , L ₃ are positive, the photocouplers F ₁ , F ₂ , F ₃ do not output. The rotation control computer C ₁ is connected to each photocoupler F ₁ , F ₂ ,
The phases on the output lines L ₁ , L ₂ , and L ₃ are determined based on a composite signal of the output signal of the F _{3 and} the output signal of the DC power supply E.

The rotation control computer C ₁ has a receiving circuit 2
3 is signal-connected, and the loom control computer C ₀ is signal-connected to the receiving circuit 23. The loom control computer C ₀ sends the operation instruction through the reception circuit 23 to rotate the control computer C _1. A waveform shaping circuit 24 is connected to the rotation control computer C ₁ by signal, and a rotary encoder 25 is connected to the waveform shaping circuit 24 by signal. The rotary encoder 25 outputs the origin pulse signal once per rotation of the loom, and outputs a plurality of k (for example, 180) angle detection pulse signals for detecting the rotation angle of the loom. The waveform shaping circuit 24 includes the rotary encoder 2
The detection signals from the 5 to waveform shaping and outputs the rotation control computer C _1.

A drive circuit 2 is provided in the rotation control computer C _1.
6 are connected to the signal, and the drive circuit 26 is electrically connected to the electromagnetic contactors 15, 16, and 19. Electromagnetic contactor 15 rotates the control computer C ₁ is connected through the drive circuit 26,
Opening / closing of 16 and 19 is controlled.

FIG. The output of the electromagnetic contactor switching control means and rotation control computer C ₁ which is a frequency converter output control means 15,16,19 are opened and closed, and the frequency converting circuit 20 of the electromagnetic contactor 15,16,19 4 7 is controlled based on the loom rotation control program shown in the flowchart of FIG.

When the power of the loom is turned on, the loom control computer C0 sends the set rotation speed V0 preset by the input device 28 to the rotation control computer C1.
The rotation control computer C1 calculates a temporal target pulse interval T0 when switching from the delta connection circuit to the star connection circuit based on the set rotation speed V0. The initially set target pulse interval T0 is equal to the interval between the angle detection pulse signals output from the rotary encoder 25 at the set rotation speed V0. Rotarie Nko spacing angle detection pulse signal outputted from da 25 loom if they match the target pulse interval T0 calculated set will be rotating at the preset revolution speed V0.

When the start switch 27 is turned on, the loom control computer C ₀ sends a start signal to the rotation control computer C.
Output to ₁ . The rotation control computer C ₁ instructs the electromagnetic contactors 15 and 19 to turn on in response to the input of the start signal. When the electromagnetic contactor 15 is turned on, the delta connection circuit is closed, and the commercial power supply 17 is supplied to the delta connection circuit. In the delta connection circuit configuration, an overvoltage exceeding the rated voltage between the primary windings CL ₁ , CL ₂ and CL ₃ in the star connection circuit configuration is applied between the primary windings CL ₁ , CL ₂ and CL ₃ .

The rotation control computer C ₁ determines the instantaneous loom rotation speed Vx based on the interval Tx between the pulse signals for angle detection from the rotary encoder 25. When the detection pulse interval Tx reaches the target pulse interval T ₀ , the rotation control computer C ₁ issues an instruction to turn off the electromagnetic contactor 15 and an instruction to turn on the electromagnetic contactor 16.

FIG. 3 is an output control timing chart corresponding to the rotation control program. A waveform S ₁ represents an ON signal to the electromagnetic contactor 19. Waveform S ₂ is electromagnetic contactor 1
Represents the ON signal for the 5, waveform S ₃ electromagnetic contactor 16
Represents an ON signal corresponding to.

The waveform S ₄ represents the actual ON state of the electromagnetic contactor 19. Waveform S ₅ represent the actual ON state of the electromagnetic contactor 15, the waveform S ₆ represents the actual ON state of the electromagnetic contactor 16. Waveform S ₁₀ represents an output command to the frequency converter circuit 20, the waveform S ₁₁ represents the response of the frequency conversion circuit 20.

The electromagnetic contactors 15, 16 and 19 have a response delay, and an electric iter lock is set between the electromagnetic contactors 15 and 16. That is, the time α ₁ represents the response delay time of the electromagnetic contactor 19, and the time α ₂ represents the response delay time of the electromagnetic contactor 15. The time γ is the value of the electromagnetic contactor 1
6 represents the sum of the response delay time α ₃ and the interlock time β. OFF command of electromagnetic contactor 15 and electromagnetic contactor 16
After the ON command, the delay time t ₀ has elapsed, the rotation control computer C ₁ instructs the OFF of the electromagnetic contactor 19. Electromagnetic contactor 19 is turned OFF after the response delay time alpha _1,
The turning on of the commercial power supply 17 to the loom drive motor M is shut off.

The waveform S _{7 in} FIG. 3 represents the phase on the commercial power supply output line L ₁ detected by the phase detection circuit 22. Waveform S ₈ is detected phase, S ₉ on the commercial power source output line L ₂ represents the detected phase of the commercial power supply output line L _3. When the electromagnetic contactor 15 is turned off, both the delta connection circuit and the star connection circuit are opened. Due to this open state, the outputs of the photocouplers F ₁ , F ₂ , F _{3 in} the phase detection circuit 22 are stopped, and only the output of the DC power supply E is input to the rotation control computer C ₁ . Therefore, the waveforms S ₇ , S ₈ , and S ₉ output from the phase detection circuit 22 correspond to the OF of the electromagnetic contactor 15.
It goes high at the same time as F.

The electromagnetic contactor 16 turns on after an interlock time β since the electromagnetic contactor 15 turns off. The star connection circuit is formed by turning on the electromagnetic contactor 16. The loom drive motor M is still rotating even after the electromagnetic contactors 15 and 16 are both turned off. Electromagnetic contactor 16
There a star formation line circuit is constituted by turned ON, inertial rotation of the loom driving motor M is brought power generating action, the generated voltage is generated in the star connection circuit. The phase detection circuit 22 detects the phase of the generated voltage. As shown in FIG.
The phase waveforms S ₇₁ , S ₈₁ , and S ₉₁ after the ON time θ _{2 of No.} 6 indicate the phases P ₁ , P ₂ , and P ₃ of the generated voltage. When the electromagnetic contactor 16 is turned on, one of the phases of the commercial power supply output lines L ₁ , L ₂ , L _{3 in} the high level state is inverted.

The rotation control computer C ₁ stores the level inversion timings t ₁ , t ₂ , t ₃ and the inversion directions from the second to the fourth detection phases P ₁ , P ₂ , P ₃ . The period (t ₂ −t ₁ ) from the level inversion timing t ₁ to the level inversion timing t ₂ is π / 3 in terms of the rotation angle of the loom drive motor M. Similarly, the period (t ₃ −t ₂ ) from the level inversion timing t ₂ to the level inversion timing t ₃ is π / 3 in terms of the rotation angle of the loom drive motor M. By examining the state of the level inversion every π / 3 rotation of the loom drive motor M three times, it is possible to grasp the phase waveform including the level inversion portion as the phase waveform on each of the commercial power supply output lines L ₁ , L ₂ , L ₃ . Rotation control computer C ₁ is to grasp the commercial power output line L _1, L _2, L ₃ overall detected phase _{(P 1, P 2, P} 3) based on the understanding of the level inversion situation described above. Level inversion n-th on the basis of the grasped rotation control computer C ₁ is detected phase _{(P 1, P 2, P} 3) (8 th in the present embodiment)
At the time point t ₄ , the phase ( _n
P ₁ , _n P ₂ , _n P ₃ ) are determined.

Rotation control computer C₁Is the detected
Bell turnover time t₁, T_Two, T_ThreeRotate based on
The rotational speed of the loom drive motor, that is, the frequency f of the generated voltage is calculated.
Set out. First, the level inversion timing t₁, T_TwoBased on
The frequency f_{twenty one}= 1 / [6 (t_Two-T₁)]
And then the frequency f₃₂= 1 / [6 (t_Three-T_Two)]
Put out. And both frequencies f_{twenty one}, F₃₂Average value (f_{twenty one}+
f₃₂) / 2 = (t_Three-T ₁) / [12 (t_Two-T₁)
(T_Three-T_Two)] Is calculated. This average adoption is photo
Coupler F₁, F_Two, F_ThreeTaking into account the detection delay of
You. And the rotation control computer C₁Is the frequency f
T (t_Three-T₁) / [6 (t_Two-T₁) (T _Three−
t_Two)] + Δf is set. Δf is a positive value and the frequency
Motor by a load accompanying switching of use to conversion circuit 20
Compensate for slippage.

Further, the rotation control computer C ₁ , based on the set frequency f, determines the n-th time point of the level inversion t ₄ =
Calculate t ₁ + (n−2) / 6f. Rotation control computer C ₁ explores the memory whether information of the constant pulse interval T _I and the frequency f _I. Constant pulse interval T _I is the time interval of the origin pulse signal outputted from the rotary encoder 25 in the previous steady-state operation, the rotation control computer C ₁ stores the constant pulse interval T _I. Stationary pulse interval T
Reciprocal 1 / T _I of the _I represents the average rotational speed of the loom. Further, the rotation control computer C ₁ operates the frequency conversion circuit 20 at this time.
Storing frequency f _I output from.

When there is no information on the steady pulse interval T _I and the frequency f _I , the rotation control computer C ₁ calculates t = t ₄
Then, the frequency f = (t ₃ −t ₁ ) / [6 (t ₃ −
t ₂ ) (t ₂ −t ₁ )] and phase ( _n P ₁ , _n P ₂ , _n
The output of P ₃ ) is commanded to the frequency conversion circuit 20. The phase waveforms S ₇₂ , S ₈₂ , and S ₉₂ of FIG. 3 are the frequency f and the phase ( _n P ₁ , _n P ₂ , _n P ₃ ) output from the frequency conversion circuit 20.
Power. That is, the rotation control computer C ₁ tunes to the detected phase (P ₁ , P ₂ , P ₃ ) at a frequency f = (t ₃
−t ₁ ) / [6 (t ₃ −t ₂ ) (t ₂ −t ₁ )] and the phase ( _n P ₁ , _n P ₂ , _n P ₃ ) based on the power generation during the inertia rotation of the loom drive motor M. To set. By adjusting the phase of the electric power from the frequency conversion circuit 20 to the rotation speed of the loom drive motor M during the inertial rotation, a phase shift at the time of switching from driving by the commercial power supply 17 to driving by the frequency conversion circuit 20 is avoided. Is done. When the rotation phase and the power phase of the loom drive motor M are shifted, the phase shift acts on the loom drive motor M as a braking action or an acceleration action. If the braking action or the acceleration action acts on the loom drive motor M, the fluctuation from the set steady number of times V ₀ increases, which adversely affects the weaving. In the present embodiment, such a decrease in the loom rotation performance does not occur in order to perform accurate phase tuning.

When the information of the steady pulse interval T _I and the frequency f _I is stored, the rotation control computer C ₁ sets T _I f _I / (kT ₀ ) as the output frequency f, and when t = t ₄ , the frequency f = T _I f _I / (kT ₀ ) and phase ( _n P
_{1, n} P _2, the output of the _n P ₃₎ instructs the frequency conversion circuit 20. kT ₀ is equal to the time interval of the origin pulse signal,
1 / (kT ₀ ) represents the set rotation speed V ₀ that has been set. T
_I f _I / (kT ₀ ) is a frequency obtained by multiplying the ratio of the set rotation speed V ₀ to the loom rotation speed 1 / T _I during steady operation by the output frequency f _I.

The frequency conversion circuit 20 determines the frequency f and the phase (
_n P ₁ , _n P ₂ , _n P ₃ ) and the time T
After the lapse of f, the rotation control computer C ₁ compares the detected pulse interval T _I with the set pulse interval kT ₀ . When T _I > kT ₀ , the output frequency f _I becomes (f _I +
Δf _I ). Δf _I is a positive value, and the output frequency unit f _I is increased and changed to (f _I + Δf _I ). This frequency increase change causes the loom rotation speed to increase and converge to the set rotation speed V ₀ . If T _I <kT ₀ , the output frequency f _I is replaced with (f _I −Δf _I ), and the output frequency unit f _I is reduced and changed to (f _I −Δf _I ). This frequency reduction loom rotational speed by changing converges to the set rotational speed V ₀ decreases. When the loom rotation speed reaches the set rotation speed V ₀ , the detection pulse interval T _I becomes equal to the set pulse interval kT ₀ .

T_I= KT₀The rotation control computer
Data C₁Is the output frequency f at this time _IIs the output frequency
And the detection pulse interval T_IAnd output
Frequency f_IIs stored. The detection pal stored in this way
Interval T_IAnd output frequency f _IAt the next start of the loom
Adopted as described above.

The loom driving motor M is provided with a frequency conversion circuit 20.
Slip occurs due to the load associated with switching to use. Therefore, when the frequency during power generation of the loom drive motor M is set to the frequency at the time of starting output of the frequency conversion circuit 20, the loom rotation speed decreases. In this embodiment, when there is no information on the steady pulse interval T _I , the frequency obtained by adding Δf to the frequency during power generation of the loom drive motor M is used as the frequency during output rotation. This addition prevents the loom speed from dropping.

The method of determining the frequency at the start of output from the frequency conversion circuit 20 at the time of restarting the loom using the steady pulse interval T _I and the frequency f _I during the steady operation is almost unaffected by the loom operating load. Provides smooth loom rotation performance. The frequency f _I is the output frequency from the frequency conversion circuit 20 when rotating stably at the set rotation speed V ₀ .
The rotation drive of the loom that has been started up to the set rotation speed V ₀ by the commercial power supply 17 is transferred to the output of the frequency f _I from the frequency conversion circuit 20 that stably provides the set rotation speed V ₀ . Accordingly, the rotation of the loom started by the commercial power supply 17 smoothly changes to the set rotation speed V ₀ by the output of the frequency conversion circuit 20, and good loom rotation performance can be obtained.

ON operation of stop switch 29 or abnormality
When a stop signal is input due to the occurrence, the loom control computer
Data C₀Is the rotation control computer C₁Output stop signal to
I do. Rotation control computer C₁Responds to the stop signal input.
In response, a command is issued to turn off the electromagnetic contactors 16 and 19. Configuration
If there is a change in the number of revolutions, the loom control computer C ₀
The rotation setting computer C
₁Send to Rotation control computer C₁Is the changed setting
From delta connection to star connection based on speed
Target pulse interval T at the time of switching₀Is calculated
Put out.

[0037]

As described above in detail, according to the present invention, the output frequency of the frequency conversion circuit corresponding to the rotation speed of the loom during steady operation is stored in the frequency conversion circuit output control means, and the setting in the next operation of the loom is performed. Since the frequency conversion circuit outputs a frequency obtained by multiplying the ratio of the rotation speed to the loom rotation speed during the steady operation by the stored output frequency, the switching from use of the commercial power supply to use of the frequency conversion circuit is performed by the loom drive. This can be performed while suppressing the rotation fluctuation of the motor, and has an excellent effect that a good loom rotation performance can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment embodying the present invention and incorporating a control circuit.

FIG. 2 is a drive circuit diagram.

FIG. 3 is an output control timing chart.

FIG. 4 is a flowchart showing a loom rotation control program.

FIG. 5 is a flowchart showing a loom rotation control program.

FIG. 6 is a flowchart showing a loom rotation control program.

FIG. 7 is a flowchart showing a loom rotation control program.

[Explanation of symbols]

Reference numeral 17 denotes a commercial power supply, 18 a drive device, 19 an electromagnetic contactor serving as a commercial power switch, 20 a frequency conversion circuit, 25 a rotary encoder serving as a rotation speed detecting means,
M: a loom drive motor; C ₁ : a rotation control computer serving as switching control means and frequency conversion circuit output control means.

Claims (2)

(57) [Claims] 1. A during startup of the loom drives the loom driving motor by a commercial power supply, then drives the loom driving motor by a frequency converter, a loom driving motor during startup of the loom over
Delta connection circuit for excitation and loom drive during normal operation
A commercial power supply switch for turning on and off the commercial power supply to the loom drive motor in a loom that is capable of opening and closing a star connection circuit for exciting the dynamic motor at the rated excitation, and a rotational speed detector that detects the rotational speed of the loom Means, and based on a comparison between the detected rotation speed obtained from the rotation speed detection means and a preset rotation speed, after switching from the delta connection circuit to the star connection circuit, the commercial power switch is changed from the closed state to the open state . Switching control means for controlling the switching to use of the frequency conversion circuit, and the loom drive motor is driven by the output of the frequency conversion circuit.
During steady-state operation to be dynamic, stores the output frequency of the frequency conversion circuit corresponding to the weaving machine rotating speed that is detected by the rotation speed detecting means, during the steady operation and setting rotational speed at the next operation of the loom The above is stored in the ratio to the loom speed.
And a frequency conversion circuit output control means for controlling an output from the frequency conversion circuit so as to output a frequency multiplied by the output frequency during the next operation of the loom . Wherein during startup of the loom drives the loom driving motor by a commercial power supply, then drives the loom driving motor by a frequency converter, a loom driving motor during startup of the loom over
Delta connection circuit for excitation and loom drive during normal operation
In a loom that can be opened and closed with a star connection circuit for exciting the dynamic motor at the rated excitation, the rotational speed at the start of the loom is detected by the rotational speed detector.
And delta if the resulting detected rotation speed and the rotation speed that is pre-Me set proportional <br/> compare, the detected rotation speed reaches the set rotational speed imaging
Line circuit to the star connection circuit, and then switch the commercial power switch from the closed state to the open state to change the frequency.
Performs steady operation of the loom due to the use of several conversion circuit, the output frequency of the frequency conversion circuit corresponding to the rotational speed of the loom during the constant <br/> normal operation remembers, the a set speed for the next operation of the loom next a frequency obtained by multiplying the output frequency to the memory to the ratio between the rotational speed of the loom in steady-state operation is output from the frequency conversion circuit
The driving method of weaving machine to perform the operation times of the loom.