JPH06322630A - Device for driving motor of warper or the like, stoppage control device using the same - Google Patents

Abstract

PURPOSE:To largely improve the utilization efficiency of electric power and smoothly decelerate and stop motors on the outage of the power by disposing a common capaci tor on the input side of an inverter circuit and decelerating the motors through rate control devices in accordance to a prescribed deceleration curved line. CONSTITUTION:A motor-driving device of multi-selection driving system for a warper, etc., is characterized by disposing a common capacitor C on the input sides of power regeneration inverter circuits disposed in response to plural motors, respectively, and connecting a resistor R through a switching circuit SW switched by the output of an electric voltage detector VD to constitute the driving system of the motors. A regenerated power from the motors M1-Mn of regeneration states subjected to the feeding of a electric power from an electric source AC through a converter circuit CV is stored in the capacitor C and subsequently fed to the motors M1-Mn of power states. The rotations of the motors are controlled with rate control devices corresponding to the above-mentioned inverter circuit IV1-IV deg.C, respectively, and the rotation rates of the motors M1-Mn are reduced in accordance to a deceleration curved line in which the sum of the regenerated powers of the plural motors M1-Mn always exceeds the sum of the powers on the outages of the powder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention effectively utilizes regenerative electric power from a plurality of motors constituting a multi-section drive system, and is capable of smoothly decelerating and stopping even when a power failure occurs. The present invention relates to a motor drive device such as a transponder and a stop control device using the motor drive device.

[0002]

2. Description of the Related Art A warp preparation machine such as a warp sizing machine, a warping machine, and a rewinding machine (hereinafter simply referred to as a warping machine) runs a warp sheet through a plurality of motors arranged in multiple stages. ,
These motors constitute a so-called multi-section drive system.

A plurality of such motors Mi (i = 1, 2, ...
n) is an AC motor, and a common power source A is supplied via independent inverter drive devices Di (i = 1, 2, ... N).
It is generally driven by C (FIG. 8).

Each inverter drive device Di is composed of a converter circuit CV and an inverter circuit IV capable of regenerating electric power, which are connected in series. A smoothing capacitor C and a resistor R are arranged on the input side of the inverter circuit IV. It is set up. However, the resistor R is connected to the input side of the inverter circuit IV via the switching circuit SW driven by the voltage detector VD. Since the voltage detector VD closes the switching circuit SW by detecting that the regenerative power from the motor Mi is accumulated in the capacitor C and the voltage of the capacitor C has risen, the resistor R consumes the regenerative power from the motor Mi. However, dynamic braking can be applied to the motor Mi. The voltage detector VD opens the switching circuit SW when the voltage of the capacitor C becomes excessively small, and keeps the voltage of the capacitor C within an appropriate range. The control signal S is externally applied to the inverter circuit IV of each inverter driving device Di.
Since i (i = 1, 2, ... N) is input, the inverter circuit IV can accelerate and decelerate the motor Mi according to the control signal Si.

[0005]

According to such a conventional technique, the regenerative electric power from each motor is consumed only by the resistance and cannot be effectively used as the power running electric power of other motors. There was a problem that there is room for further improvement in terms of overall power use efficiency. That is, in general, a plurality of motors constituting a multi-section drive system are often in a regenerative state when a part thereof is in a power running state. Therefore,
If the regenerative power from the motor in the regenerative state can be supplied to the motor in the power running state, the overall power use efficiency can be greatly improved. However, in the conventional configuration, each inverter drive device is electrically connected. This was not possible because it was independent.

In addition, when it is attempted to smoothly stop the whole according to a predetermined deceleration curve during a power failure, the motor connected to the load having a small inertia has to be decelerated in a power running state, so some backup power supply is used. There was also a problem that it would not be possible unless it was provided.

In view of the problems of the prior art, the object of the present invention is to significantly improve the overall power utilization efficiency by providing a common capacitor for energy storage on the input side of the inverter circuit. It is to provide a motor drive device such as a warper that can be used.

Another object of the present invention is to use the regenerative electric power of the motor during deceleration so as to decelerate the whole according to a predetermined deceleration curve without trouble even when a power failure occurs without providing a backup power supply. It is to provide a stop control device such as a warper that can be stopped.

[0009]

The structure of the first invention according to this application for achieving the above object is an inverter circuit capable of regenerating electric power corresponding to each of a plurality of motors constituting a multi-section drive system, The gist of the invention is to include a converter circuit that is placed in front of the inverter circuit and a common capacitor for energy storage that is arranged on the input side of the inverter circuit.

The configuration of the second invention comprises the motor drive device according to the first invention, and a speed control device which controls the rotation of one motor through an inverter circuit and serves as a master control system of a multi-section drive system. The speed control device has the gist of decelerating the motor to be controlled according to the deceleration curve for a power failure such that the sum of the regenerative electric power of a plurality of motors always exceeds the sum of the power running electric power during a power failure. To do.

Incidentally, the speed control device, when energized,
It is possible to follow a deceleration curve different from that for a power failure.

[0012]

In the structure of the first aspect of the invention, since the capacitor is commonly arranged on the input side of the inverter circuit, if any of the plurality of motors is in a regenerative state, the regenerative power from the motor is regenerated. Can be stored as energy, and the stored energy can be released as the power running power of other motors. That is, when some of the motors are in the regenerative state, the other motors can effectively use the regenerative power from the motors in the regenerative state as power running power.

According to the configuration of the second invention, the speed control device performs deceleration control of the motor to be controlled according to the deceleration curve for the power failure during the power failure. The deceleration curve at this time is the total regenerative power. Is selected so that it always exceeds the sum of power running power, so even if the power from the power supply is not supplied due to a power outage, by using the regenerative power from the motor in the regenerative state, all motors can be Is decelerated according to a predetermined deceleration curve and is not left in a free running state. That is, the speed control device at this time can decelerate while maintaining all the motors included in the multi-section drive system in a predetermined mutual relationship and stop the entire motor without any trouble.

When the speed control device follows a deceleration curve different from the deceleration curve for a power failure when energized, the entire speed is smoothly decelerated according to an arbitrary deceleration curve when the power supply is normally stopped. , Can be stopped.

[0015]

Embodiments Embodiments will be described below with reference to the drawings.

The motor drive circuit of the warper or the like includes an inverter circuit IVi (i = 1, 2, ... N) corresponding to each of the plurality of motors Mi (i = 1, 2, ... N) and an input of the inverter circuit IVi. And a common capacitor C connected to the side (FIG. 1). However, the motor Mi constitutes a multi-section drive system as a whole, and the inverter circuit IVi is capable of regenerating electric power.

The inverter circuit IVi has a common power source AC.
Thus, power is supplied via the common converter circuit CV. A common resistor R is connected to the input side of the inverter circuit IVi via a switching circuit SW, and the switching circuit SW is assumed to be opened / closed by the output of the voltage detector VD. A control signal Si (i = 1, 2, ... N) is input to each inverter circuit IVi.

In such a motor drive device, when any motor Mi is in a regenerative state, the regenerative power generated in the motor Mi can be stored in the capacitor C via the corresponding inverter circuit IVi. That is, the capacitor C at this time is for energy storage for storing the regenerative electric power from the motor Mi. At this time, when the voltage of the capacitor C becomes excessive, the voltage detector VD operates and closes the switching circuit SW, so that the resistor R can consume the excess regenerative power.

On the other hand, at this time, another arbitrary motor Mj
When (j = 1, 2, ... N, j ≠ i) is in the power running state, the motor Mj can effectively use the regenerative power from the motor Mi as the power running power. The regenerated electric power that can be used at this time includes both the energy stored in the capacitor C and the energy recovered from the motor Mi via the inverter circuit IVi. Therefore, the power supply AC and the converter CV need only bear the shortage of the power running power required by the motor Mj that the capacitor C and the motor Mi cannot supply.

Such a motor drive device can be applied to a warp sizing machine (FIG. 2).

The warp sizing machine runs the warp sheet SH from the delivery beam BM1 so as to have a predetermined tension, and finally winds the warp sheet SH around the winding beam BM5. That is, the warp sheet SH from the delivery beam BM1 is fed by the tension roller T
Feed roller F with R1 and pressure roller FR1
R, sizing rollers SR, SR ... for gluing, drum rollers DR, DR ..., Tension roller TR2 for drying having guide rollers GR1, GR2 on both front and rear sides,
It reaches the take-up beam BM5. The tension roller TR
1 and TR2 are load cell elements LC1 for tension measurement,
LC2 is attached, and sizing rollers SR, SR
A sizing pan SR1 for accommodating the sizing material is disposed below the ...

Sending beam BM1, feed roller FR,
Sizing rollers SR, SR ..., Drum rollers DR, D
R ..., the winding beam BM5 has motors M1, M2 ... M5
Are connected, and these motors Mi (i = 1, 2, ...
5) constitutes a multi-section drive system. It should be noted that each motor Mi is supplied with an inverter circuit IVi fed by a power source AC via a common converter circuit CV.
(I = 1, 2, ... 5) are connected, and a common capacitor C is connected to the input side of each inverter circuit IVi. However, the resistor R for consuming the regenerative electric power, which is connected in parallel with the capacitor C, is not shown together with the voltage detector VD and the switching circuit SW. Further, each inverter circuit IVi has a control signal Si (i = 1, 2).
The controller CRi (i = 1, 2, ...) Which outputs 5)
5) is attached.

The controllers CR1 and CR5 have tensions T1 detected by the load cell elements LC1 and LC2, respectively.
, T2 is fed back. Further, the rotation speeds n2 and n3 of the motors M2 and M3 are fed back to the controller CR2 via pulse generators PG and PG attached to the motors M2 and M3, and the rotation speed n2 and n3 of the motor M3 is fed to the controller CR3. In addition, the rotation speed n4 of the motor M4 is fed back via the pulse generator PG attached to the motor M4.
Further, the rotation speed n4 of the motor M4 is fed back to the controller CR4.

The controller CR4 is a speed controller (FIG. 3). That is, the controller CR4
Speed setter 11, acceleration / deceleration curve generator 12, summing point 1
3, the controller 14 is connected in series, the acceleration / deceleration curve generator 12
The relay contacts RL1 and RL2 are input to. The relay contact RL1 is closed according to the operation command signal of the warp sizing machine, and the relay contact RL2 is opened at the time of power failure of the power supply AC. The rotation speed n4 of the motor M4 is fed back to the addition point 13, and the output of the controller 14 is input to the inverter circuit IV4 as the control signal S4.

The warp sizing machine is a controller CR4.
Can operate as a master control system.

Now, when the operation command signal is generated and the relay contact RL1 is closed while the power source AC is normal, the acceleration / deceleration curve generator 12 of the controller CR4 causes the set value n11 of the speed setter 11 to change to the target speed. Then, a speed increasing curve K1 that rises at a predetermined rate of change is generated (time t = 0 in FIG. 4), and the speed target value no that increases according to this speed increasing curve K1 is output to the summing point 13 (in the same figure). Time 0≤t≤t1). Therefore, the summing point 13 outputs the speed deviation Δn = no −n4 to the controller 14, and the controller 14 can output the control signal S4 corresponding to the speed deviation Δn to the inverter circuit IV4. That is, the inverter circuit IV4 power-controls the motor M4 in accordance with the control signal S4, and the speed increasing curve K1
Accordingly, the motor M4 can be slowly started.

When the motor M4 is started, its rotation speed n4 is input to the controller CR3. Therefore, the controller CR3 follows the rotation speed n3 of the motor M3 with respect to the rotation speed n4 of the motor M4 at a predetermined ratio. Thus, the rotation of the motor M3 is controlled via the inverter circuit IV3. On the other hand, the controller CR2 similarly controls the rotation of the motor M2 via the inverter circuit IV2 so that the rotation speed n2 of the motor M2 follows the rotation speed n3 of the motor M3 at a predetermined ratio. That is, the controllers CR3 and CR2 are connected to the motors M4 and M3, respectively.
During this time, the stretch control device controls the rotational speeds n3 and n2 of the motors M3 and M2 so that the stretch ratio between the motors M3 and M2 becomes a predetermined value.

On the other hand, the controller CR1 feeds back the tension T1 from the load cell element LC1 to control the rotation of the motor M1 and the delivery beam BM1 through the inverter circuit IV1 so that the tension T1 becomes a predetermined value. Further, the controller CR5 similarly controls the motor M5 and the winding beam B via the inverter circuit IV5 so that the tension T2 from the load cell element LC2 becomes a predetermined value.
Control the rotation of M5. That is, the controller CR1,
CR5 is a tension control device that keeps the tensions T1 and T2 at predetermined values.

When the controller CR4 starts the motor M4 as described above, the other motors Mi (i = 1, 2)
... 5, i ≠ 4) are activated all at once, and the transmission beam BM1
It is possible to run the warp sheet SH from No. 2 with a predetermined tension and then wind it up on the winding beam BM5.

The rotation speed n4 of the motor M4 is the speed setter 1
When the set value n11 of 1 is reached (time t = t1 in FIG. 4),
After that, the motor M4 is operated at a constant speed and other motors Mi
(I = 1, 2, ... 5, i ≠ 4) is the controller CRi
Under the control of (i = 1, 2, ... 5, i ≠ 4), the operation can be continued at a substantially constant speed. When the operation command signal disappears (time t = t2 in FIG. 4), the relay contact RL
Since 1 is opened, the acceleration / deceleration curve generator 12 generates a predetermined deceleration curve K2 and decreases the speed target value no (time t2 ≤t≤t3 in the figure).
The vehicle can decelerate and stop according to
= T3).

In the above control during energization, the deceleration curve K2 from the acceleration / deceleration curve generator 12 may be an appropriate S-shaped curve in order to smoothly decelerate and stop the whole (Fig. 5). The same applies to the speed increasing curve K1.

When a power failure occurs during operation of the warp sizing machine,
The relay contact RL2 opens (time t = t2a in FIG. 6). Therefore, the acceleration / deceleration curve generator 12 at this time generates a deceleration curve K3 for a power failure different from that for energization.

Now, a virtual deceleration curve K4 when all the motors Mi included in the warp sizing machine are mechanically connected and the whole system is naturally stopped is generally of an exponential function type (see the same figure). Time t2a ≦ t ≦ t2c). Therefore, if a deceleration curve K3 for a power failure is determined so as not to exceed such a deceleration curve K4, a plurality of motors M included in the entire system
The sum of the regenerative electric power of i can always exceed the sum of the power running electric power. In order to realize the deceleration curve K3 that exceeds the deceleration curve K4, it is necessary to drive the motor Mi to perform power running, while in order to realize the deceleration curve K3 that falls below the deceleration curve K4, the motor Mi is in the regenerative state. This is because the motor Mi must be braked. Therefore, the deceleration curve K that falls below the deceleration curve K4
According to 3, motor M that is in a regenerative state at the time of power failure
By using the regenerative power from i, the whole system can be smoothly decelerated and stopped without providing any backup power supply.

However, if the deceleration curve K3 is made too steep, the control of the motor Mi by the controller CRi may be impaired. Therefore, it is most preferable that the deceleration curve K3 coincides with the tangent line of the virtual deceleration curve K4 when a power failure occurs. Further, by selecting such a deceleration curve K3, even if a part of each motor Mi is in the power running state, it is possible to use the regenerative electric power from the other regenerative state. That is,
At this time, the controller CRi and the inverter circuit IVi
Using the controller CR4 as the master control system, all the motors Mi can be smoothly decelerated and stopped according to the deceleration curve K3 (time t2a≤t≤t2 in FIG. 6).
b) The controller CR4 decelerates the motor M4 to be controlled according to the deceleration curve K3, so that all the other motors Mi (i = 1, 2, ... 5, i ≠).
4) can be followed.

During deceleration, if the sum of the regenerative electric power of each motor Mi falls below the sum of the power running electric power, each motor Mi is short of the power running electric power at that time and the deceleration curve K3 May not be maintained. Therefore, it is preferable that the deceleration curve K3 is set so that the total sum of the regenerative electric power always exceeds the total sum of the power running electric power over the entire period during the deceleration.

However, at time t ≧ t2a in FIG. 6,
Since the power supply AC is lost due to the power failure, the controller CRi during this period uses the regenerative electric power from the motor Mi in the regenerative state, or uses another appropriate backup power source to supply power.

In the above description, the converter circuit C
V and capacitor C are n motors Mi (i = 1, 2, ...
n converters CVi (i)
= 1, 2, ... N), and n capacitors Ci (i = 1, 2, ...
n) (FIG. 7). Each of the converter circuit CVi and the capacitor Ci can correspond to the capacity of the motor Mi, and the individual capacity can be reduced.

Needless to say, the above description is not limited to the warp sizing machine, but can be applied to other machines such as a warping machine and a rewinding machine. Further, at that time, the motor Mi, the controller CRi, the inverter circuit IVi
Is an arbitrary number of at least two or more.

[0039]

As described above, according to the first invention of this application, by providing a common capacitor for energy storage on the input side of the inverter circuit, the capacitor can be separated from the motor in the regenerative state. Since the regenerated electric power can be accumulated and supplied to the motor in the power running state, there is an excellent effect that the electric power use efficiency as a whole can be significantly improved.

According to the second aspect of the invention, the speed control device decelerates the motor to be controlled in accordance with a predetermined deceleration curve so that the regenerative power from the motor in the regenerative state is used as the power running power of the other motor. Therefore, even if there is a power outage, without providing a backup power supply,
There is an effect that the whole can be smoothly decelerated and stopped according to a predetermined deceleration curve for a power failure.

[Brief description of drawings]

[Figure 1] Overall block system diagram (1)

[Figure 2] Overall block system diagram (2)

[Figure 3] Block system diagram of main parts

[Fig. 4] Operation explanatory diagram (1)

FIG. 5 is an operation explanatory diagram (2)

FIG. 6 is an operation explanatory diagram (3)

FIG. 7 is a view corresponding to FIG. 1 showing another embodiment.

FIG. 8 is a view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 Mi (i = 1, 2 ... n) ... Motor IV, IVi (i = 1, 2 ... n) ... Inverter circuit CV, CVi (i = 1, 2 ... n) ... Converter circuit C, Ci (i = 1, 2 ... n) ... Capacitors K2, K3 ... Deceleration curve

Claims (3)

[Claims] 1. An inverter circuit capable of regenerating electric power corresponding to each of a plurality of motors constituting a multi-section drive system, a converter circuit placed in front of the inverter circuit, and energy arranged on the input side of the inverter circuit. A motor drive device such as a warper, which is provided with a common storage capacitor. 2. The motor drive device according to claim 1, and a speed control device that controls rotation of one of the motors via the inverter circuit and serves as a master control system of a multi-section drive system. The speed control device is characterized by decelerating a motor to be controlled according to a deceleration curve for a power failure such that a sum of regenerative electric powers of the plurality of motors always exceeds a sum of power running electric powers during a power failure. Stop control device for business machines, etc. 3. The speed control device, when energized,
The stop control device for a warper or the like according to claim 2, wherein the stop control device follows a deceleration curve different from the deceleration curve for a power failure.