JPH1172087A - Operating device for motor-driven rotary machine and its operation control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a delivery flow smoothly to increase or decrease it by properly switching over a constant frequency power and an inverter device to a plurality of pump motors without using a starter device that must be reduced in size. SOLUTION: A first group of switch means SW1-1, SW1-2, SW1-3, and SW1-4 are provided between the output end of an inverter device VF and motors M1 to M4 connected to pumps P1 to P4, respectively, and a second group of switch means SW2-1, SW2-2, SW2-3, and SW2-4 are provided between a constant frequency power 10 and the motors M1 to M4. A flow detector means 12 to detect a delivery flow and a control means 14 are installed and, based on a signal detected according to the delivery flow, the control means 14 adjusts the output frequency of the inverter device VF and controls to open or close the first and second groups of switch means SW1-1 to SW2-4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for operating a rotating machine driven by a motor, comprising a plurality of fluid machines, and controlling the number of operating machines and the number of revolutions to control the control target amount, and an operation control method therefor. It is about.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional apparatus for controlling a discharge flow rate by operating a plurality of pumps in parallel. In FIG. 4, an inverter VF is provided between a constant frequency power supply 10 and motors M1, M2, M3, and M4 of four pumps P1, P2, P3, and P4, for example.
1, VF2, VF3, VF4 and switch means SW1, S
W2, SW3, and SW4 are interposed in series. Then, in response to the detection signal of the flow rate detecting means 12 for detecting the discharge flow rate by the parallel operation, the control means 14 controls the output frequency of the inverter devices VF1, VF2, VF3, VF4 and the opening and closing of the switch means SW1, SW2, SW3, SW4. Controlled.

To increase the discharge flow rate from zero, first, one switch means SW1 to which one motor M1 of the pump P1 is connected is closed, and another switch means SW is connected.
2, SW3 and SW4 are opened to adjust the output frequency of the inverter VF1 from zero. Accordingly, the discharge flow rate increases. If the discharge flow rate is insufficient even in the 100% rotation operation in which one pump is driven at a predetermined output frequency, the switch means SW2 to which another motor M2 of one pump P2 is connected is closed. , The output frequency of the inverter VF2 is increased from zero. Then 1
The discharge flow rate is increased by the pump P1 operated at 00% rotation and the other pump P2 operated at a rotation speed less than 100%. And the second pump P2 is 100%
If the discharge flow rate is still insufficient even in the rotation operation, the number of pumps to be operated is increased to the third and fourth pumps.

In order to reduce the discharge flow rate, 1
If there is a pump that does not perform the rotation operation of less than 00%, the output frequency of the inverter driving the pump is reduced to reduce the discharge flow rate. If the discharge flow rate does not sufficiently decrease even when the output frequency of the inverter device becomes zero, the output frequency of the inverter device that drives another pump that operates at 100% rotation is reduced. In this way, the number of pumps that are sequentially operated is reduced to a desired discharge flow rate. When the pump is no longer driven by the inverter device, the switch means connected to the motor of the pump is opened in conjunction therewith.

FIG. 5 shows another example of a conventional apparatus for controlling the discharge flow rate by operating a plurality of pumps in parallel. In FIG. 5, an inverter VF1 and a switch SW1 are interposed between a constant frequency power supply 10 and a motor M1 of one pump P1. And the motors M2, M3, of the other pumps P2, P3, P4
A starting device S is provided between M4 and the constant frequency power supply 10, respectively.
T1, ST2, ST3 and switch means SW2, SW3
SW4 is interposed in series. The starting device ST
Each of ST1, ST2 and ST3 is formed by connecting an inductance and a switch for controlling an inrush current in parallel. Also, as shown in FIG.
Control device 14 in accordance with the output of
And the switch means SW1, SW2, SW3, SW4 and the starting devices ST1, ST2, ST3 are controlled.

When the discharge flow rate is to be increased from zero, first, the switch means SW1 is closed, and the other switch means SW2, SW3, SW4 are opened, and the output frequency of the inverter VF is adjusted to increase from zero. . Accordingly, the discharge flow rate increases. If the discharge flow rate is insufficient even if the pump P1 is operated at 100% rotation, another switch means SW2 connected to the motor M2 of the pump P2, for example.
Is closed to start the motor M2. At the same time, the output frequency of the inverter VF is reduced to zero to reduce the discharge flow rate of the pump P1 of the motor M1. When the motor M2 is sufficiently started, the switch of the starting device ST1 is closed. If the discharge flow rate is insufficient, the output frequency of the inverter VF is increased again to increase the discharge flow rate of the pump of the motor M1. Similarly, until a sufficient discharge flow rate is obtained, the number of pumps that are fixedly operated at 100% rotation by the constant frequency power supply 10 is increased, and the discharge flow rate of one pump P1 that is operated at a variable speed by the inverter VF is increased. Make adjustments.

In order to decrease the discharge flow rate, first, the output frequency of the inverter VF is reduced to reduce the discharge flow rate.
% Of the pump that is operating at the same speed is opened to stop the pump operation, and at the same time, the inverter device VF is opened.
Is increased until the output frequency of the pump P1 becomes substantially the same as the frequency of the constant frequency power supply 10, and the pump P1 is operated at 100% rotation. Here, if the discharge flow rate is still too large, the output frequency of the inverter VF is further reduced to reduce the discharge flow rate. If the decrease in the discharge flow rate is still insufficient, similarly, the number of other pumps operated at 100% rotation is reduced to a desired discharge flow rate.

[0008]

FIG. 4 shows a disadvantage that the number of inverters required is equal to the number of pumps, and the distribution board on which the inverters are provided becomes large. In particular, as the output capacity of the motor linked to the pump increases, the output capacity of the inverter device also needs to be large, and the device becomes large.

Although FIG. 5 shows a single inverter, a starting device is required instead of the inverter. These starting devices also increase the size of the switchboard and do not provide satisfactory satisfaction. Also,
There is an operational problem that the switching operation of the switch means and the like when switching the pump is complicated, and the opening and closing timing thereof is extremely difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described disadvantages of the conventional device, and allows a single inverter device to be used to smoothly adjust a control target amount without using a starting device. It is an object of the present invention to provide an operation device of a rotating machine driven by a motor and an operation control method thereof, which can be performed.

[0011]

In order to achieve the above object, an operation apparatus for a rotary machine driven by a motor according to the present invention comprises a plurality of fluid machines that are operated in parallel and a motor connected to these fluid machines. A constant frequency power supply for driving and one inverter device, a first switch means group interposed between an output terminal of the inverter device and each of the motors, the constant frequency power supply and each of the motors A second group of switch means interposed therebetween, a control target amount detection means for detecting a control target quantity controlled by the plurality of fluid machines, and Control means for controlling the output frequency of the inverter device and opening / closing of each switch means of the first and second switch means groups, and driven by the constant frequency power supply according to a desired control target amount. It is configured to control the rotational speed of the motor for driving the number of serial motor and in the inverter device.

The control means may include a means for accumulating the operating time for each motor, and may be configured to preferentially start a motor having a small integrated value calculated by the means for accumulating.

Further, a different integrated value for each motor may be preset in the control means as an initial setting.

According to the method of controlling the operation of a rotary machine driven by a motor according to the present invention, a plurality of fluid machines to be operated in parallel, a constant frequency power supply for driving a motor connected to these fluid machines, and one inverter device A first switch means group interposed between the output terminal of the inverter device and each of the motors, and a second switch means group interposed between the constant frequency power supply and each of the motors And a control target amount detection unit for detecting a control target amount controlled by the plurality of fluid machines, and a control unit, wherein the control unit controls the control target amount to be a desired control target amount. When increasing the discharge flow rate or the discharge air amount of the fluid machine, first increase the output frequency of the inverter device, and then increase the discharge frequency even if the output frequency of the inverter device increases to a predetermined value. If the flow rate or the discharge air volume is insufficient, the first and second switch means are controlled to open and close to switch the motor connected to the inverter device to the constant frequency power supply and output to the non-operating motor. The constant frequency power supply is connected by connecting the inverter device having a reduced frequency, further increasing the output frequency, increasing the output frequency of the inverter device and switching the motor connected thereto until the desired control target amount is obtained. Is controlled to increase the number of motors connected to the motor.

Further, the operation control method for a motor driven rotary machine according to the present invention provides a plurality of fluid machines to be operated in parallel, a constant frequency power supply for driving a motor connected to these fluid machines, and one An inverter device, a first switch means group interposed between the output terminal of the inverter device and each of the motors, and a second switch interposed between the constant frequency power supply and each of the motors Means,
A control target amount detection unit that detects a control target amount controlled by the plurality of fluid machines, and a control unit, wherein the control unit sets the control target amount to a desired control target amount. When decreasing the discharge flow rate or the discharge air volume of the fluid machine, first reduce the output frequency of the inverter device, and if the discharge flow rate or the discharge air volume is too large even if the output frequency of the inverter device decreases to a predetermined value. For example, the first and second switch means are controlled to open and close to disconnect the motor connected to the inverter device from the inverter device and to switch the constant frequency power source from one motor operating with the constant frequency power source. And the inverter device whose output frequency has been increased is connected, and the output frequency is further decreased. The inverter is further operated until the desired control target amount is obtained. Wherein is controlled so as to reduce the motor number to be connected to a constant-frequency power source by switching the motor to be reduced and its connection output frequency of the motor apparatus.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block circuit diagram of an embodiment in which the operating device for a rotary machine driven by a motor according to the present invention is applied to pump equipment. FIG. 2 is a flowchart showing one embodiment of the operation control method of the apparatus shown in FIG.

First, the configuration of the pump equipment as a rotating machine driven by a motor will be described with reference to FIG. Between the output terminal of one inverter device VF and the motors M1, M2, M3 and M4 respectively connected to four pumps P1, P2, P3 and P4, which are a plurality of fluid machines as an example. Switch means SW1-1, SW1-2, S
W1-3 and SW1-4 are interposed. Further, between the constant frequency power supply 10 and the motors M1, M2, M3, M4, separate switch means SW2-1, SW2-2, SW2-
3, SW2-4 are interposed. Here, the switch means S
W1-1 to SW1-4 are first switch means groups,
The switch means SW2-1 to SW2-4 are a second switch means group. Then, the discharge flow rate as the control target quantity by the parallel operation is detected by the flow rate detection means 12 as the control target quantity detection means, and the detection signal is given to the control means 14. The control means 14 includes motors M1, M2,
A signal indicating that the motor is running is given from M3 and M4, and an integrating means for integrating the operating time is provided for each motor. Then, the output frequency of the inverter device VF is controlled by the control means 14, and the opening and closing of the first and second switch means groups are controlled.

Next, an operation control method will be described with reference to FIG. First, different integration values are set in advance for the operation time integration means for each motor provided in the control means 14, and a provisional activation order is set (step 1). For example, the integration means of the motor M1 has 0 operation time,
The motor M2 is set to 10 operating hours, the motor M3 is set to 20 operating hours, and the motor 4 is set to 30 operating hours. And
When the operation is started to increase the discharge flow rate, first, the switch means SW1-1 is closed so that the inverter device VF having the output frequency of zero is connected to the motor M1 having the minimum integrated value of the operation time, The other switch means remains open (step 2). And the flow rate detecting means 12
Is compared with the desired discharge flow rate (step 3). Since the discharge flow rate is insufficient, the output frequency of the inverter VF is increased (step 4), and the output frequency is further increased to 100% (output frequency). Is a state in which the motor is operated at 100% rotation at the maximum predetermined value) (step 5). If it does not reach 100%
Returning to step 3, the discharge flow rates are compared again. If the discharge flow rate is still insufficient, go to step 4, and if the discharge flow rate matches the desired discharge flow rate,
The output frequency of F is maintained (step 6), and the process returns to step 3.

Then, if the output frequency of the inverter VF reaches 100% (step 5) and the discharge flow rate is insufficient in the 100% rotation operation of one pump P1, it is determined whether there is a motor that is not operating. (Step 7). Here, only the motor M1 is operating, and the other motors are not operating. Therefore, first, the inverter device VF is stopped, the switch means SW1-1 is opened, the switch means SW2-1 is closed, and the constant frequency power supply 10 is connected to the motor M1 to drive the motor M1 at a constant frequency. Then, assuming that the output frequency of the inverter VF is zero, the motor M2 having the smallest integrated value of the operation time among the non-operating motors
The switch means SW1-2 is closed and connected (step 8), and the process returns to step 3.

In this way, until the discharge flow rate increases to the desired discharge flow rate, the output frequency of the inverter VF rises, the motor is switched to the constant frequency power supply 10, and the operation of the non-operating motor is started. The connection of the inverter device VF to the motor with the smallest integrated value of time is repeated. If the discharge flow rate matches the desired discharge flow rate (step 3), the output frequency of the inverter VF at that time is maintained (step 6), and if there is a motor connected to the constant frequency power supply 10, The driving is continued. If it is determined in step 7 that there is no non-operating motor, the discharge flow rate cannot be increased any more, and the process returns to step 3 without performing any switching control or the like.

If the discharge flow rate is higher than the desired discharge flow rate in step 3, the output frequency of the inverter VF is first reduced (step 9), and the output frequency is further reduced to 0% (the output frequency is set to the minimum predetermined value, Is determined to be a 0% rotation operation, that is, a state of stopping (step 10). If it has not reached 0%, the process returns to step 3 and the discharge flow rate is compared again. If the discharge flow rate is still too large, the flow returns to step 9; if the discharge flow rate matches the desired discharge flow, the flow returns to step 6. Even if the output frequency of the inverter VF reaches 0% (Step 1)
0) If the discharge flow rate is too large, it is determined whether there is an operating motor connected and driven to the constant frequency power supply 10 (step 11). If there is a running motor, first stop the inverter device VF, open the switch means connected to this motor, and further calculate the integrated value of the running time from the motors running on the constant frequency power supply 10. The switch means for connecting the largest motor to the constant frequency power supply 10 is opened and disconnected, and an inverter device VF having an output frequency of 100% is connected to this motor (step 12), and the process returns to step 3.

In this manner, the output frequency of the inverter VF is reduced and cut off until the discharge flow rate decreases to a desired discharge flow rate, and further, the motor operated by the constant frequency power supply 10 is cut off and the inverter to the motor is turned off. The connection of the device VF is repeated. If the discharge flow rate matches the desired discharge flow rate (step 3), the output frequency of the inverter VF at that time is maintained (step 6), and if there is a motor connected to the constant frequency power supply 10, Continue driving. If it is determined in step 11 that there is no motor being operated by the constant frequency power supply, the discharge flow rate cannot be reduced below this, and the parallel operation of the pumps is stopped.

In the above operation control method, the discharge flow rate can be smoothly increased and decreased by sequentially switching and connecting one inverter device VF to the motor. When starting another motor in order to increase the discharge flow rate, among the non-operating motors, the motor with the smallest integrated value of the operation time is started, and the operation is performed to reduce the discharge flow rate. When one of the motors is stopped, the motor with the largest integrated operation time is stopped among the running motors, so that the operation times of the plurality of motors are equalized. It should be noted that the control means 14 determines whether the motor is driven by the constant-frequency power supply 10 or not.
The case where the vehicle is driven by F is similarly recognized as being in operation, and the operation time is naturally added. In addition, the provisional integrated value for each motor set in step 1 sets the starting order of the motors when the present apparatus is operated for the first time, and once the operation is performed, each motor corresponds to the operation time. Step 1 is unnecessary if the apparatus has an integrated value, and the apparatus is operated and stopped once, and then restarted. It will be easily understood that step 1 is required when the integrated value of the integrating means of the control means 14 is cleared.

Another embodiment of the operation control method will be described with reference to FIG. First, the starting order of each motor is set in the control means 14 in advance (step 1). Here, the operation time of each motor is not integrated by the control means 14, and a signal indicating that the motor is being operated may not be given to the control means 14 from the motors M1, M2, M3, M4. . Then, when the operation is started and the discharge flow rate is increased, first, the switch means SW1-1 is closed so that the inverter device VF having the output frequency of zero is connected to, for example, the motor M1 in the starting order 1, for example ( Step 2). Then, the discharge flow rate detected by the flow rate detecting means 12 is compared with the desired discharge flow rate (step 3). If the discharge flow rate is insufficient, the output frequency of the inverter VF is increased (step 4). Is determined to be 100% (step 5), and if not, the process returns to step 3. If the discharge flow rate is still insufficient, go to step 4. If the discharge flow rate matches the desired discharge flow rate,
The output frequency of the inverter VF is maintained (step 6), and the process returns to step 3.

If the output frequency of the inverter VF reaches 100% (step 5) and the discharge flow rate is still insufficient, the motor to which the inverter VF is connected is activated in the fourth starting order, ie, in the last starting order. It is determined whether the motor is a motor (step 7). Here, the inverter device VF is connected to the motor of the starting order 1, and first, the inverter device VF is switched to the switch means SW1-1.
To disconnect from the motor M1, switch the switch SW2-1 to the motor M1, connect the constant frequency power supply 10, and close the inverter VF with the output frequency of 0% to the switch SW1-2. And the motor M2 of the starting order 2
(Step 8), and returns to Step 3.

In this manner, until the discharge flow rate increases to the desired discharge flow rate, the output frequency of the inverter VF rises, the motor is switched to the constant frequency power supply 10, and the inverter is switched to the next motor in the starting order. The connection of the VF is repeated. In step 7, if the motors connected to the inverter VF have the last starting order, all the motors are driven by the constant frequency power supply 10 and driven by the 100% output frequency of the inverter VF. As described above, the discharge flow rate cannot be increased. Therefore, the process returns to step 3 as it is.

If the discharge flow rate is higher than the desired discharge flow rate in step 3, the output frequency of the inverter VF is first reduced (step 9), and it is determined whether the output frequency is 0%. (Step 10).
If it has not reached 0%, the process returns to step 3 and the discharge flow rates are compared. Even if the output frequency reaches 0% (step 10), if the discharge flow rate is too large, the inverter device V
It is determined whether the motor F is currently connected to the motor in the starting order 1 or the earliest starting order (step 1).
1). If the motor is not the first in the starting order, the inverter device VF is first stopped and the switch means connected to this motor is opened, and further, the switch means for connecting the motor immediately prior to the starting order to the constant frequency power supply 10. Is opened and disconnected, and an inverter device with an output frequency of 100% is connected to this motor (step 12), and the process returns to step 3.

In this way, until the discharge flow rate decreases to the desired discharge flow rate, the output frequency of the inverter VF is reduced and the motor is disconnected from the motor, and the constant frequency power supply 10 of the motor whose starting order is one immediately before is disconnected. And the connection of the inverter device VF to the motor is repeated.

In the operation control method shown in FIG. 3, the operation time of each motor cannot be made uniform, but the control is simple because the starting order is set in advance.

Here, even in the operation control method shown in FIG. 3, if the starting order of the motors is sequentially changed every fixed period, for example, every two months, the operation time can be made uniform over a long period of time. Is obtained. Further, if the integrated value of the operation time of each motor is obtained and the starting order is set in ascending order of the integrated value of the operation time for each fixed period, the operation time can be made more uniform.

In the above-described embodiment, the pump equipment for controlling the discharge flow rate of a plurality of pumps has been described. However, the present invention is not limited to this, and the blower equipment as a motor driven rotary machine having a plurality of blowers as fluid machines. It goes without saying that the present invention may be applied. In this case, the control target amount is the discharge air amount. Further, in order to control the concentration of soot or carbon monoxide in the tunnel, the present invention is applied to a ventilation device as a rotary machine driven by a motor provided with a plurality of jet fans as a fluid machine in the tunnel. Is also good. In such a case, the control target amount is the fume transmittance or the carbon monoxide concentration related to the smoke concentration. Then, when these values in the tunnel exceed a predetermined amount, the discharge air amount of the jet fan may be increased, and if the value is less than the predetermined amount, the discharge air amount may be reduced to save the driving power. . In addition, the present invention can be applied to a fan coil unit as a rotating machine driven by a motor provided with a plurality of units each having a fan as a fluid machine. In this case, the control target amount is set to the temperature of the blown air of the fan coil unit, the discharge air amount of the fan is increased to increase the effect of cooling or heating, and the discharge air amount of the fan is decreased to decrease the effect. It may be configured as follows. And further, a cooling device as a rotating machine driven by a motor having a fan as a fluid machine in each of a plurality of cooling towers,
Similarly, the present invention may be applied. In this case, the control target amount is the circulating water outlet temperature. If the outlet temperature is higher than a predetermined value, the discharge air volume of the fan may be increased, and if the outlet temperature is lower than the predetermined value, the discharge air volume may be reduced.

As an example, the inverter VF used in the above embodiment is preferably a variable voltage variable frequency type inverter in which the output voltage is almost proportional to the increase of the output frequency. The motor is a three-phase squirrel-cage induction motor. Further, when the motor is disconnected from the inverter VF and the constant frequency power supply 10 is connected to the motor, the motor is set to free run by disconnecting the inverter VF, and the constant frequency power supply 10 is connected to the free run motor. I just need.
Furthermore, when the motor is disconnected from the constant-frequency power supply 10 and an inverter device is connected to the motor, the motor is set to free-run by disconnecting the constant-frequency power supply 10, and the free-running motor is set to the free-running speed. In this case, an inverter device VF having an output frequency matching with the above may be connected. The switching connection of the inverter device VF and the constant frequency power supply 10 to the motor is a known technique. For example, a commercially available inverter device manufactured by Yaskawa Electric Co., Ltd., model name VRISPEED-616G5 includes the above switching function.

[0033]

As is apparent from the above description, the driving apparatus for a rotary machine driven by a motor and the operation control method thereof according to the present invention have the following special effects which cannot be obtained by the prior art. To play.

[0034] In the driving apparatus for a rotary machine driven by a motor according to the first aspect of the present invention, one inverter device is appropriately switched and connected to motors of a plurality of fluid machines.
Both motors are started by the inverter device, so that a starting device is not required and the size of the switchboard can be reduced. In addition, the discharge flow rate or the discharge air volume can be adjusted by adjusting the rotation speed of the motor by the inverter device, and any adjustment of the discharge flow rate or the discharge air volume can be smoothly adjusted.

In the driving device for a rotary machine driven by a motor according to the second aspect, the operation time of each motor is integrated, so that the motor having the smaller integrated value is preferentially started. The operation time of each motor can be made uniform.

Further, in the driving apparatus for a rotary machine driven by a motor according to the third aspect, a temporary integrated value different for each motor is preset in the integrating means of the operating time for each motor as an initial setting. Therefore, when the present apparatus is operated for the first time, the starting order of each motor can be easily set based on the initially set integrated value.

According to a fourth aspect of the present invention, in the method for controlling the operation of a rotary machine driven by a motor, when the discharge flow rate or the discharge air amount is increased so that the control target amount becomes a desired control target amount, an inverter is required. When the output frequency of the device is increased and the output frequency reaches 100%, the motor is connected to a constant-frequency power source to drive the motor and the inverter device is connected to a non-operating motor. It is very smooth. Further, the starting of the motor during non-operation is performed by the inverter device, and does not require a starting device.

According to a fifth aspect of the present invention, there is provided an operation control method for a rotary machine driven by a motor, wherein the discharge flow rate or the discharge air amount is reduced so that the control target amount becomes a desired control target amount. The output frequency of the inverter device is reduced, and when the output frequency becomes 0%, the inverter device is disconnected from the motor, the constant frequency power source is disconnected from the motor connected to and driven by the constant frequency power source, and the inverter device is connected to the motor. Is connected, the discharge flow rate or discharge air volume can be reduced very smoothly.

Further, in any of the operation control methods of a rotary machine driven by a motor according to claim 6 or 7, since the starting order of the motors is set in advance, the discharge flow rate or the discharge air amount is increased and decreased. If you want to
Next, the motor to which the inverter device is to be connected may be set based on the starting order, and the switching control is simple.

Furthermore, in the operation control method for a rotating machine driven by a motor according to the eighth aspect, since the starting order is changed and set at regular intervals, the operation time of each motor can be made uniform over a long period of time. .

Further, in any of the operation control methods for a rotary machine driven by a motor according to the ninth or tenth aspect, when increasing or decreasing the discharge flow rate or the discharge air flow, an inverter device is connected next. Since the power motor is selected based on the integrated value of the operation time of each motor, the operation time of each motor can be made uniform.

Also, in any of the motor-driven rotary machine operating devices according to the present invention, a plurality of fluid machines are smoothly adjusted by using one inverter device, and the discharge flow rate or the discharge amount is adjusted. The air flow and the like can be increased or decreased, and the operation control device can be reduced in size and inexpensive, can be economically configured as equipment or as a whole, and is extremely useful in practical use.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of an embodiment in which an operating device of a rotary machine driven by a motor according to the present invention is applied to pump equipment.

FIG. 2 is a flowchart showing one embodiment of an operation control method of the apparatus shown in FIG.

FIG. 3 is a flowchart showing another embodiment of the operation control method of the apparatus shown in FIG. 1;

FIG. 4 is a block circuit diagram of an example of a conventional pump parallel operation device.

FIG. 5 is a block circuit diagram of another example of a conventional parallel operation device for pumps.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Constant frequency power supply 12 Flow rate detection means 14 Control means P1, P2, P3, P4 Pump M1, M2, M3, M4 Motor VF Inverter device SW1-1, SW1-2, SW1-3, SW1-4, S
W2-1, SW2-2, SW2-3, SW2-4
Switch means

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI H02P 7/74 H02P 7/74 G (72) Inventor Kenji 2-19-1, Kita, Kashihashi-cho, Kita-Katsushika-gun, Saitama Prefecture Kanto region, Ministry of Construction Construction Bureau Tonegawa upstream construction office (72) Inventor Masanobu Kunigami 2-1-1, Kurihashi-cho, Kita-Katsushika-gun, Saitama Prefecture 2-9-1-1, Kanto Regional Construction Bureau, Ministry of Construction, Tonegawa Upper Construction Office (72) Inventor, Michiaki Negishi 1-5-1, Omorikita, Ota-ku, Tokyo Denkisha Machine Works (72) Inventor, Souhei Umezawa Osaka 2-47 Shishitsuhigashi, Naniwa-ku, Osaka-shi, Japan

Claims (15)

[Claims] 1. A plurality of fluid machines which are operated in parallel, a constant frequency power supply for driving a motor connected to these fluid machines and one inverter device, an output terminal of the inverter device and each of said inverter devices. A first switch means group interposed between motors, a second switch means group interposed between the constant frequency power supply and each of the motors,
Control target amount detection means for detecting a control target amount controlled by the plurality of fluid machines; an output frequency of the inverter device and the first and second switches in response to a detection signal of the control target amount detection means Control means for controlling the opening and closing of each switch means of the means group, and controls the number of the motors driven by the constant frequency power supply and the rotation speed of the motors driven by the inverter device according to a desired control target amount. A driving device for a rotating machine driven by a motor, characterized in that it is configured as described above. 2. The driving device for a rotary machine driven by a motor according to claim 1, wherein the control means includes an operation time integrating means for each of the motors, and a motor having a small integrated value calculated by the integrating means. An operating device for a rotating machine driven by a motor, characterized in that the operating device is configured to be started preferentially. 3. An apparatus for operating a rotary machine driven by a motor according to claim 2, wherein a different integrated value for each motor is preset in said control means as an initial setting. Device for rotating machinery. 4. A plurality of fluid machines which are operated in parallel, a constant frequency power supply for driving a motor connected to these fluid machines and one inverter device, an output terminal of the inverter device and each of said inverter devices. A first switch means group interposed between motors, a second switch means group interposed between the constant frequency power supply and each of the motors,
A control target amount detection unit for detecting a control target amount controlled by the plurality of fluid machines; and a control unit, wherein the control unit controls the fluid so that the control target amount becomes a desired control target amount. When increasing the discharge flow rate or discharge air volume of the machine, first increase the output frequency of the inverter device, and if the discharge flow rate or discharge air volume is insufficient even when the output frequency of the inverter device increases to a predetermined value. The inverter device in which the first and second switch means are controlled to open and close to switch the motor to which the inverter device is connected to the constant frequency power source and to reduce the output frequency of the non-operating motor. And further increasing the output frequency, increasing the output frequency of the inverter device and the connected mode until the desired control target amount is obtained. A method for controlling the operation of a rotating machine driven by a motor, characterized in that the motor is switched so as to increase the number of motors connected to the constant frequency power supply. 5. A plurality of fluid machines to be operated in parallel, a constant frequency power supply for driving a motor connected to these fluid machines and one inverter device, an output terminal of the inverter device and each of said inverter devices. A first switch means group interposed between motors, a second switch means group interposed between the constant frequency power supply and each of the motors,
A control target amount detection unit for detecting a control target amount controlled by the plurality of fluid machines; and a control unit, wherein the control unit controls the fluid so that the control target amount becomes a desired control target amount. When decreasing the discharge flow rate or the discharge air volume of the machine, first reduce the output frequency of the inverter device, and if the discharge flow rate or the discharge air volume is too large even if the output frequency of the inverter device decreases to a predetermined value. Controlling the opening and closing of the first and second switch means to disconnect the motor connected to the inverter device from the inverter device, and to switch the constant frequency power supply from one motor operating with the constant frequency power supply. Disconnect the inverter device whose output frequency is increased by disconnecting, further reduce the output frequency, and adjust the inverter until the desired control target amount is obtained. A method for controlling the operation of a rotating machine driven by a motor, characterized in that the output frequency of the motor device is reduced and the connected motor is switched so as to reduce the number of motors connected to the constant frequency power supply. 6. The method for controlling the operation of a rotary machine driven by a motor according to claim 4, wherein the control means presets the starting order of the motors and increases the discharge flow rate or the discharge air volume. An operation control method for a rotating machine driven by a motor, wherein the switching connection is controlled to be performed on the next motor in the starting order. 7. The method for controlling the operation of a rotary machine driven by a motor according to claim 5, wherein the control means sets a starting order of the motors in advance and reduces the discharge flow rate or discharge air volume. An operation control method for a rotating machine driven by a motor, wherein the switching connection is controlled so as to be performed on the motor one immediately before in the starting order. 8. The operation control method for a rotary machine driven by a motor according to claim 6 or 7, wherein the preset starting order is changed and set at regular intervals. Method. 9. The method according to claim 4, wherein said control means includes an operation time integrating means for each of said motors, and said inverter for increasing said discharge flow rate or discharge air volume. A method for controlling the operation of a rotary machine by a motor drive, characterized in that the switching connection of the device is controlled to be performed to the motor having the smallest integrated value of the operating time calculated by the integrating means among the non-operating motors. . 10. The operation control method for a rotary machine driven by a motor according to claim 5, wherein the control means includes an operation time integrating means for each of the motors, and the inverter for reducing the discharge flow rate or discharge air volume. A rotating machine driven by a motor, wherein the switching connection of the device is controlled to be performed to a motor having the largest integrated value of the operation time calculated by the integrating means among the motors operating with the constant frequency power supply. Operation control method. 11. The operating device for a rotary machine driven by a motor according to claim 1, wherein the fluid machine is a pump of a pump facility, and the controlled object amount is controlled by the plurality of pumps. An operating device for a rotary machine driven by a motor, wherein the operating speed is a discharge flow rate. 12. The operating device for a rotary machine driven by a motor according to claim 1, wherein the fluid machine is a blower of a blower, and the controlled object amount is controlled by the plurality of blowers. An apparatus for operating a rotary machine driven by a motor, characterized by a discharge air volume. 13. The operating device for a rotary machine driven by a motor according to any one of claims 1 to 3, wherein the fluid machine is a jet fan of a ventilator, and the control target amount is controlled by the plurality of jet fans. An operating device for a rotating machine driven by a motor, wherein the operating speed is a haze transmittance or a carbon monoxide concentration. 14. The operating apparatus for a rotary machine driven by a motor according to claim 1, wherein the fluid machine is a fan of a fan coil unit, and the control target amount is the number of the plurality of units. An operating device for a rotating machine driven by a motor, wherein the operating temperature is a temperature of air blown from the fan coil unit controlled by a fan. 15. The operating device for a rotary machine driven by a motor according to claim 1, wherein the fluid machine is a fan of a cooling tower of a cooling facility, and the control target amount is the plurality of fans. A circulating water outlet temperature controlled by cooling by a motor.