JP5831276B2 - Operation control apparatus and operation control method for loom - Google Patents

Description

  The present invention relates to an operation control device and an operation control method for a loom including a delta connection circuit for overexciting a loom drive motor and a star connection circuit for exciting a loom drive motor.

  Patent Document 1 discloses a start-up method in which an overvoltage exceeding the rated voltage during steady operation is applied to the loom driving motor in order to prevent the occurrence of a weaving stage due to a lack of striking force immediately after the start of operation of the loom. . In the start-up method disclosed in Patent Document 1, the loom drive motor is accelerated by a commercial power source using a delta connection circuit when the loom is started, and the loom drive motor is driven by an inverter using a star connection circuit during steady operation of the loom. Is done.

  When the delta connection circuit is used, the electromagnetic contactor for the delta connection circuit is turned on. When the star connection circuit is used, the electromagnetic contactor for the delta connection circuit is turned off and the electromagnetic contactor for the star connection circuit is turned on. The electromagnetic contactor for the delta connection circuit is turned off when it is detected that the loom speed has reached a predetermined speed.

  The drive circuit (delta drive circuit) that drives the electromagnetic contactor for the delta connection circuit is a solid state relay that has a zero cross function that stops the output of the output signal in the vicinity of zero current when the ON command signal does not enter (OFF) It is equipped with.

  Such a delta drive circuit has advantages such as a solid state relay (non-contact relay) having a zero-cross function has no contact failure, is highly reliable, generates less noise, and is inexpensive. Yes.

JP-A-6-235145

  However, there is a variation in the timing at which the ON command signal does not enter (ON → OFF), but the OFF operation of the delta drive circuit is the timing at which the current crosses zero after the ON command signal is turned off regardless of the variation (the current is zero). Is turned off at the zero cross timing. The maximum width of the variation is half of (1000 milliseconds / 50 hertz) when the frequency of the commercial power source is 50 hertz. That is, there is a possibility that the OFF operation of the delta drive circuit is delayed by half of (1000 milliseconds / 50 hertz), for example, from the desired OFF timing. Such a delay causes a variation in the overshoot of the loom rotation speed at the start of the loom, and there is a possibility that a weaving step occurs at the start of the loom.

  An object of the present invention is to prevent the occurrence of a weaving step at the start-up when a delta connection circuit for overexciting a loom drive motor is used.

The invention of claim 1 to claim 4 includes a delta connection circuit for overexciting the loom drive motor, a star connection circuit for exciting the loom drive motor, the loom drive motor, and a three-phase AC power source. An operation control apparatus in a loom having a three-phase AC power supply direct input circuit connected without an inverter is used as a target, and in the invention of claim 1, a phase detection means for detecting a phase of a current applied to the loom drive motor And a control means having a start operation control function for starting the loom drive motor using the three phase AC power supply direct input circuit and the delta connection circuit, and the start operation control function is the three phase AC power supply direct input circuit. a particular zero-cross timing of the phase detection control start time after by said phase detecting means during the startup operation using, Zeroku subsequent to the particular zero-cross timing The delta drive circuit of the delta connection circuit is turned ON at a specific timing between the ON timing and the delta drive at the zero cross timing that arrives after the time when the zero cross timing is measured for a preset target number of times from the ON time. This is a control function for turning off the circuit.

  In the present invention, the number of phases refers to the number of zero cross timings of the current measured by the phase detection means. Since the delta drive circuit is turned off at the zero cross timing that arrives after the time when the zero cross timing is measured the target number of times from the specific timing at which the delta drive circuit is turned on, the delta drive circuit is turned off at a desirable OFF timing. This prevents a variation in the overshoot of the loom speed at the start of the loom and prevents the occurrence of the weaving step at the start of the loom.

  In a preferred example, the specific timing at which the delta drive circuit is turned on is a timing when a predetermined time α set in advance has elapsed from the specific zero-cross timing measured by the phase detection means.

  In a preferred example, the specific time α is a corrected loom speed corrected so as to provide a target overshoot amount at the OFF timing of the delta drive circuit, and a plurality of times at the OFF timing of the delta drive circuit. Is corrected by using the average value of the loom rotation speed and the target phase number.

  In the present invention, the overshoot amount means the difference ΔN1 between the loom speed (No + ΔN1) exceeding the preset loom target speed No and the target speed Vo, and the target speed No after reaching the target speed No. It is the ratio (ΔN1: ΔN2) of the difference ΔN2 between the lower loom rotational speed (No−ΔN2) and the target rotational speed No. The specific time α is adjusted to provide a preset target overshoot amount.

In a preferred example, the target phase number is an integer value obtained by rounding down an average value in starting a plurality of looms.
According to a fifth aspect of the present invention, a delta connection circuit for overexciting the loom drive motor, a star connection circuit for exciting the loom drive motor, the loom drive motor, and a three-phase AC power source through an inverter. In the operation control method in a loom having a three-phase AC power supply direct input circuit connected without being connected, a phase for detecting a phase of a current applied to the loom drive motor during start-up operation using the three-phase AC power supply direct input circuit After the specific zero-cross timing is measured by the detection means, the delta drive circuit of the delta connection circuit is turned on at a specific timing between the specific zero-cross timing and the zero-cross timing subsequent to the specific zero-cross timing. The zero crossing reached after measuring the zero cross point for the preset target phase count from It turns OFF the delta driving circuit in points.

  INDUSTRIAL APPLICABILITY The present invention has an excellent effect that it is possible to prevent the occurrence of a weaving step at the start-up when using a delta connection circuit for overexciting a loom drive motor.

The schematic diagram which shows one Embodiment. Timing chart. The flowchart showing an operation control program. A graph for explaining the amount of overshoot.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
M shown in FIG. 1 is a three-phase induction motor type loom driving motor, and 11 is a feeding motor independent of the loom driving motor M. A warp beam 12 is rotated by the operation of the feed motor 11, and the warp T fed from the warp beam 12 is guided to the reeds 15 and 16 via the back roller 13 and the tension roller 14. The woven fabric W is wound around the cross roll 20 via the expansion bar 17, the surface roller 18 and the press roller 19.

  The tension roller 14 is attached to one end portion of the tension lever 21, and tension is applied to the warp T by a tension applying spring 22 attached to the other end portion of the tension lever 21. The tension lever 21 is rotatably supported at one end of the detection lever 23, and a load cell 24 is connected to the other end of the detection lever 23. The warp tension is transmitted to the load cell 24 via the tension roller 14, the tension lever 21 and the detection lever 23, and the load cell 24 outputs an electric signal corresponding to the warp tension to the main control computer Co. The main control computer Co controls the rotational speed of the feed motor 11 based on the detected tension information from the load cell 24, and warp tension control during weaving is performed.

  In the loom drive motor M, the primary windings CL1, CL2, and CL3 have a delta connection circuit configuration for overexcitation when the delta magnetic contactor 25 is turned on, and the star connection circuit configuration is configured by the star electromagnetic contactor 26 being turned on. Become. The delta electromagnetic contactor 25 and the primary windings CL1, CL2, CL3 constitute a delta connection circuit. The star electromagnetic contactor 26 and the primary windings CL1, CL2, CL3 constitute a star connection circuit.

  The delta magnetic contactor 25 receives ON / OFF control of the inverter 28 via a non-zero cross type delta drive circuit 27. The star magnetic contactor 26 receives ON / OFF control of the inverter 28 via the star drive circuit 29. The non-zero cross type delta drive circuit 27 has a zero cross function that immediately outputs an output signal when an ON command signal is input (ON), and stops outputting an output signal near zero current when the ON command signal is not input (OFF). It has a solid state relay.

  The loom drive motor M is electrically connected to a commercial three-phase AC power source E via an inverter 28. The loom drive motor M is electrically connected to a three-phase AC power source E through an electromagnetic contactor 30 that is in parallel with the inverter 28. The magnetic contactor 30 receives ON / OFF control of the inverter 28 via the three-phase AC power supply direct input drive circuit 31.

  The inverter 28 receives an instruction from the sub-control computer C1 and controls the operation of the loom drive motor M. The sub-control computer C1 controls the output voltage and output frequency of the inverter 28. The loom drive motor M receives operation control of the sub-control computer C1 through the inverter 28.

  The main control computer Co is connected to a rotary encoder 32 and a start switch 33 for detecting a loom rotation angle. An input setting means 34 is connected to the main control computer Co in a signal manner. The input setting means 34 is used to input and set, in the main control computer Co, operation information including various information such as a target rotational speed No during loom steady operation, applied voltage information to the loom drive motor M, frequency information, and time information. Is. The main control computer Co outputs a control start command based on the activation of the start switch 33, loom rotation angle detection information, and various information described above to the sub control computer C1.

  A phase detection means 35 is connected to the sub-control computer C1 as a signal. The phase detection means 35 detects the phase of the current (current applied to the loom drive motor M) flowing on the output side of the electromagnetic contactor 30 on the output lines L1, L2, and L3. The phase detection information obtained by the phase detection means 35 is sent to the sub-control computer C1.

FIG. 2 shows a timing chart of ON / OFF of the magnetic contactors 25 and 30, ON / OFF of the output of the inverter 28, change in applied voltage, and change in phase.
FIG. 3 is a flowchart showing an operation control program for the loom drive motor M executed by the sub-control computer C1.

The graph of FIG. 4 shows the change in the loom rotational speed after activation.
Hereinafter, the operation control of the loom drive motor M will be described based on the timing chart of FIG. 2 and the flowchart of FIG. The main control computer Co waits for an input of a start signal when the start switch 33 is turned on. When the start signal is input, the main control computer Co outputs a control start signal to the sub control computer C1. To do.

  The sub-control computer C1 determines whether or not a control start signal has been input (step S1). When the control start signal is input (YES in step S1), the sub control computer C1 outputs an ON signal from the inverter 28 to the three-phase AC power supply direct input drive circuit 31 to turn on the three-phase AC power supply direct input drive circuit 31. (Step S2). A time t1 in FIG. 2 indicates an input time point of the control start signal, and a waveform D1 represents an output period of the ON signal for the three-phase AC power supply direct input drive circuit 31.

The electromagnetic contactor 30 is turned on after the response delay time δ1 after the three-phase AC power source direct input drive circuit 31 is turned on. A waveform D2 in FIG. 2 represents an ON period of the electromagnetic contactor 30.
A waveform Euv represents a change in voltage between the U phase and the V phase of the three-phase alternating current. A waveform Evw represents a change in voltage between the V phase and the W phase of the three-phase alternating current, and a waveform Ewu represents a change in voltage between the W phase and the U phase of the three-phase alternating current.

  After the process of step S2, the sub control computer C1 starts the phase detection control after the response delay time δ1 has elapsed (step S3). The phase detection control is control in which a current is extracted from the interphase voltages indicated by the waveforms Euv, Evw, and Ewu in FIG. 2 and the phase detection means 35 detects the phase change of the current indicated by the waveforms Ui, Vi, and Wi.

  The sub-control computer C1 determines whether or not the current phase of the detected waveform change (change in the waveform Vi in this embodiment) matches a preset specific zero cross timing Vk1 (step S4). In the present embodiment, the specific zero cross timing Vk1 is first set to 1 to 0 after the phase detection control start time [time t2 shown in FIG. 2] when the high level is 1 and the low level is 0 in the waveform Vi. This is the zero-cross timing that changes.

  When the detected current phase coincides with the specific zero cross timing Vk1 (YES in step S4), the sub-control computer C1 has passed a predetermined specific time α [see FIG. 2] from the detection time of the specific zero cross timing Vk1. It is determined whether or not it has been done (step S5). The specific time α is a value [α1 ≦ α between a preset minimum specific time α1 (> 0) [see FIG. 2] and a preset maximum specific time α2 (> α1) [see FIG. 2]. ≦ α2]. The maximum specific time α2 is a value smaller than the time β (see FIG. 2) for one phase. When the frequency is 50 Hz, β = 1000 milliseconds ÷ 50 Hz ÷ 2 = 10 milliseconds. When the frequency is 60 Hz, β = 1000 milliseconds ÷ 60 Hz ÷ 2 (milliseconds). That is, the sub control computer C1 turns on the delta drive circuit 27 at a specific timing t3 between the zero cross timing Vk2 following the specific zero cross timing Vk1.

  When the specific time α has elapsed from the time of detection of the specific zero cross timing Vk1 (YES in step S5), the sub control computer C1 outputs an ON signal from the inverter 28 to the delta drive circuit 27 to turn on the delta drive circuit 27 ( Step S6). A time t3 in FIG. 2 indicates an ON time point of the delta drive circuit 27, and a waveform Δ1 represents an output period of an ON signal for the delta drive circuit 27.

The delta electromagnetic contactor 25 is turned on after a response delay time δ2 after the delta drive circuit 27 is turned on. A waveform Δ2 in FIG. 2 represents the ON period of the delta electromagnetic contactor 25.
The sub-control computer C1 starts measuring the number of phases Mx when the specific time α has elapsed from the detection time of the specific zero cross timing Vk1 (step S7). The number of phases means the number of zero cross timings, and the measurement of the number of phases Mx in step S7 is to measure the number of phases after the specific time α has elapsed.

  The sub-control computer C1 determines whether or not the measured phase number Mx has reached a preset target phase number Mo (step S8). The zero cross timing VkMo in FIG. 2 is the zero cross timing measured from the ON time of the delta drive circuit 27 and becomes the target phase number Mo, and the time t4 indicates the OFF time of the delta drive circuit 27. When the measured phase number Mx reaches the target phase number Mo (YES in step S8), the sub-control computer C1 performs a delta from the inverter 28 at the first zero cross timing VkMo + 1 that reaches after the target phase number Mo is measured. The output of the ON signal to the drive circuit 27 is stopped, and the delta drive circuit 27 is turned off (step S9). The delta electromagnetic contactor 25 is turned off after the response delay time δ3 after the delta drive circuit 27 is turned off. Time t5 indicates the time point when the delta electromagnetic contactor 25 is OFF.

  Note that the OFF point [time t6 shown in FIG. 2] of the three-phase AC power supply direct input drive circuit 31 is set to be delayed from the expected OFF point of the delta electromagnetic contactor 25. The magnetic contactor 30 is turned off after a response delay time δ4 after the three-phase AC power supply direct input drive circuit 31 is turned off.

  The sub-control computer C1 and the inverter 28 constitute control means Ci having a start operation control function for starting the loom drive motor M using a delta connection circuit when the loom is started. The start-up operation control function turns on the delta drive circuit 27 at a specific timing between a preset specific zero-cross timing Vk1 and a zero-cross timing Vk2 subsequent to the specific zero-cross timing Vk1. This is a control function for turning off the delta drive circuit 27 at the next zero cross timing VkMo + 1 of the measured zero cross timing Vkmo.

Next, the operation of the first embodiment will be described.
A curve R in the graph of FIG. 4 showing changes in the loom rotational speed after the start represents a situation where the loom rotational speed converges to the target rotational speed No during steady operation. The transition of the loom rotational speed in the illustrated example is a transition in which the loom rotational speed falls below the target rotational speed No after exceeding the target rotational speed No, and then the loom rotational speed converges to the target rotational speed No. In this embodiment, the loom rotational speed control that causes the rotational speed transition as in the illustrated example is performed. That is, the loom rotation such that the ratio (ΔN1: ΔN2) between the maximum amount ΔN1 exceeding the target rotational speed No and the maximum amount ΔN2 below the target rotational speed No becomes the preset target ratio (ΔN1e: ΔN2e). Number control is performed. Hereinafter, the target ratio (ΔN1e: ΔN2e) is referred to as a target overshoot amount (ΔN1e: ΔN2e).

  The reference rotation speed Nm shown in FIG. 4 is the loom rotation speed when the delta drive circuit 27 is turned OFF, and the reference rotation speed Nm is selected as an appropriate value to bring the target overshoot amount (ΔN1e: ΔN2e). Has been. The reference rotation speed Nm is specified by repeating the trial activation of the loom a plurality of times. The reference rotational speed Nm is an average value of the reference rotational speeds that provides a target overshoot amount (ΔN1e: ΔN2e) for each of these multiple trial activations.

  The target phase number Mo is selected as an appropriate value to bring the reference rotation speed Nm when the delta drive circuit 27 is turned off. The target phase number Mo is specified by repeating the trial activation of the loom a plurality of times. The target phase number Mo is an integer value obtained by rounding down the decimal point of the average value of the target phase number that brings about the target overshoot amount (ΔN1e: ΔN2e) for each of the plurality of trial activations.

  The specific time α is selected as an appropriate value together with the target number of times Mo to bring the reference rotational speed Nm when the delta drive circuit 27 is turned off. The specific time α is α = α2 / 2 in the present embodiment.

  Therefore, the delta drive circuit 27 is turned on at the time when the specific time α selected as an appropriate value for providing the reference rotational speed Nm [specific timing (time t3)]. Further, the delta drive circuit 27 is turned off at the zero cross timing VkMo + 1 [time t4] after the elapse of the target phase number Mo selected as an appropriate value for bringing the reference rotational speed Nm. For this reason, the delta drive circuit 27 is turned off at an OFF timing desirable to bring the reference rotation speed Nm, and the loom rotation speed changes so as to become the target overshoot amount (ΔN1e: ΔN2e).

In the present embodiment, the following effects can be obtained.
(1) Since the delta drive circuit 27 is turned off at the zero cross timing VkMo + 1 after the target number of times Mo has elapsed from the specific timing (time t3) when the delta drive circuit 27 is turned on, the delta drive circuit 27 is turned off at a desirable OFF timing. Operate. This prevents a variation in the overshoot of the loom speed at the start of the loom and prevents the occurrence of the weaving step at the start of the loom.

In the present invention, the following embodiments are also possible.
○ Based on the reference rotation speed Nm that is an average value and the reference rotation speed Nr measured at the time of starting a new loom [corrected loom rotation speed corrected to provide a target overshoot amount (ΔN1e: ΔN2e)] Control for correcting the specific time α may be performed.

Assuming that the initial value of the specific time α is the maximum specific time α2 / 2 (value adopted in the above-described embodiment), the correction of the specific time α is performed using the following calculation formula <1>.
α = Nr ÷ Nm × (α2 ÷ 2 + Mo × β) −Mo × β (1)
However, the corrected specific time α is limited to a value [α1 ≦ α ≦ α2] between the minimum specific time α1 (> 0) and the maximum specific time α2 (> α1). That is, when the value calculated by the formula <1> is smaller than α1, the corrected specific time α is set to the minimum specific time α1, and the value calculated by the calculation formula <1> is larger than α2. In this case, the corrected specific time α is set to the maximum specific time α2.

  When the minimum specific time α1 is 0 or the maximum specific time α2 is time β, the OFF timing of the delta drive circuit 27 at the time when the target phase number Mo is measured is the time β (phase) from the original time t4. (Only once) may be displaced.

  Correction control in which the minimum specific time α1 is larger than zero and the maximum specific time α2 is smaller than the time β for one phase, that is, correction control in which the corrected specific time α is limited to [α1 ≦ α ≦ α2] This prevents the OFF timing of the delta drive circuit 27 from deviating from the original OFF timing.

  ○ When the measured overshoot amount (ΔN1: ΔN2) does not satisfy the following formula <2>, it is considered that an abnormality has occurred, the target phase number Mo is reset, and the specific time α is set to the initial value (α2 ÷ You may make it reset to 2).

−No × ε <(average value of ΔVm) <No × ε... <2>
However, ε is, for example, a value around 0.1, and ΔVm is the rotation speed represented by the following formula <3>.
ΔVm = [ΔN2e × (No + ΔN1) + ΔN1e × (No−ΔN2)] ÷ (ΔN1e + ΔN2e) −No (3)
The average value of ΔVm is a moving average value of a plurality of loom starting times set in advance.

The phase may be detected from the current indicated by the waveform Ui or the waveform Wi in FIG.
The phase change timing (zero cross timing) at which the waveform first changes from 0 to 1 after the phase detection control start time [time t2 shown in FIG. 2] may be set as the specific zero cross timing.

  The delta drive circuit 27 may be turned off simultaneously with measuring the zero cross timing VkMo. Further, the delta drive circuit 27 may be turned off not at the zero cross timing VkMo + 1 following the zero cross timing Vkmo but at the subsequent zero cross timing.

  25: Delta magnetic contactor constituting a delta connection circuit. 26 ... Star contactor constituting a star connection circuit. 27: Delta drive circuit. 28: An inverter constituting the control means. 35: Phase detection means. M: Loom drive motor. Ci: Control means. C1... Sub-control computer constituting control means. α: Specific time. Vk1: Specific zero cross timing. Mo: Target phase count. (ΔN1e: ΔN2e)... Target overshoot amount.

Claims (5)

A delta connection circuit for over-exciting the loom drive motor, a star connection circuit for exciting the loom drive motor, and a three-phase AC power source for connecting the loom drive motor and the three-phase AC power source without an inverter In the operation control device in a loom equipped with a direct entry circuit ,
Phase detection means for detecting the phase of the current applied to the loom drive motor;
Control means having a start-up operation control function for starting the loom drive motor using the three-phase AC power supply direct input circuit and the delta connection circuit;
The start-up operation control function includes a specific zero-cross timing after the start of phase detection control by the phase detection means during start-up operation using the three-phase AC power supply direct input circuit and a zero-cross timing subsequent to the specific zero-cross timing. Control to turn on the delta drive circuit of the delta connection circuit at a specific timing, and to turn off the delta drive circuit at the zero cross timing that arrives after the time when the zero cross timing is measured for a preset target number of times from the time of the ON. Operation control device in the loom which is a function.   2. The operation control device for a loom according to claim 1, wherein the specific timing for turning on the delta drive circuit is a timing at which a specific time α set in advance has elapsed from the specific zero-cross timing measured by the phase detection unit.   The specific time α includes a corrected loom rotational speed corrected to bring a target overshoot amount at the OFF timing of the delta drive circuit, and a plurality of loom rotational speeds at the OFF timing of the delta drive circuit. The operation control device for a loom according to claim 2, wherein the operation control device is corrected using an average value and the target number of phases.   The operation control device for a loom according to any one of claims 1 to 3, wherein the target phase number is an integer value obtained by rounding down a fractional part of an average value in starting a plurality of looms. A delta connection circuit for over-exciting the loom drive motor, a star connection circuit for exciting the loom drive motor, and a three-phase AC power source for connecting the loom drive motor and the three-phase AC power source without an inverter In an operation control method in a loom equipped with a direct entry circuit ,
After the specific zero cross timing is measured by the phase detection means for detecting the phase of the current applied to the loom drive motor during start-up operation using the three-phase AC power supply direct input circuit , the specific zero cross timing and the specific zero cross Zero cross point reached after the time when the delta driving circuit of the delta connection circuit is turned on at a specific timing between the timing and the zero cross timing following the timing, and the zero cross point is measured by a preset target number of times from the time of the ON. The operation control method in the loom for turning off the delta drive circuit.