JP2013027060A - Motor driving device and operating method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sequentially start a plurality of motors by a motor driving device and to stably operate the plurality of motors at rated operation.SOLUTION: A motor driving device 1 comprises: a starting power supplying device 2 that transforms station power 31 of a station bus bar 10 to starting power, sequentially supplies the starting power to a plurality of motors 11 and accelerates the plurality of motors 11 to rated operation; and a rated power supplying device 3 that transforms the station power 31 to rated power, switches a motor 11 accelerated to the rated operation out of the plurality of motors 11 from the starting power supplying device 2 and supplies the rated power to the motor 11. When a failure of the rated power supplying device 3 occurs, the starting power supplying device 2 is switched from the rated power supplying device 3 and supplies the rated power to the motor 11 operated at the rated operation out of the plurality of motors 11.

Description

The present invention relates to an electric motor operating device that starts a plurality of electric motors and performs rated operation, and an operating method thereof.

When rated operation of a plurality of electric motors at a uniform speed, conventionally, a single inverter is provided as a power supply device for the plurality of electric motors, and this inverter gradually increases the frequency and voltage for all of the plurality of electric motors. After supplying power and accelerating to rated operation, the rated power was supplied and rated operation was performed.

However, starting of the electric motor requires a starting current larger than the rated current during rated operation, and it is necessary to increase the capacity of the inverter in order to simultaneously start a plurality of electric motors. In addition, when performing rated operation for a long time, using an inverter capable of variably supplying a frequency as a power supply device may reduce reliability.

Therefore, the power supply device is divided into the startup power supply device and the rated power supply device, and the startup power supply device gradually supplies startup power whose frequency and voltage gradually increase to multiple motors to accelerate to rated operation and A technology has been developed in which a rated power is supplied by switching from a startup power supply device to a motor that has been accelerated to a rated operation among a plurality of electric motors by a power supply device (see, for example, Patent Documents 1 and 2).

JP 2010-166641 A Japanese Patent Publication No. 3-41031

However, since the technology described in Patent Document 1 and Patent Document 2 described above is not provided with a backup for supplying rated power to the motor when the rated power supply device is abnormal,
In particular, in an electric motor that needs to be rated and operated stably for a long time, there is a risk that reliability may be lowered.

Accordingly, an object of the present invention is to provide an electric motor operating device and a method for operating the electric motor that can start up a plurality of electric motors in sequence and stably perform rated operation.

In order to achieve the above object, the motor operating device of the present invention converts the in-house power of the in-house bus into starting power that gradually increases in frequency and voltage, and sequentially supplies this starting power to a plurality of motors to accelerate to rated operation. Starting power supply device that converts the in-house power into rated power and that is accelerated to rated operation among a plurality of motors, and switches from the starting power supply device to supply the rated power in parallel The starter power supply device is characterized in that when the rated power supply device is abnormal, the rated power is switched from the rated power supply device and supplied in parallel to the motors in rated operation among a plurality of motors. .

Furthermore, in order to achieve the above object, the motor operating method of the present invention converts the in-house power of the in-house bus into starting power that gradually increases in frequency and voltage, and sequentially supplies this starting power to a plurality of motors for rated operation. The motor start-up operation process that accelerates to the rated power, the motor rated operation process that converts the in-house power into the rated power and supplies the rated power to the motors that have been accelerated to the rated operation, and the rated power in the motor rated operation process A step of supplying the rated power to the electric motor using the starting power supply means in the motor starting operation step when the supply is abnormal.

According to the present invention, a plurality of electric motors can be sequentially activated by the electric motor operating device, and the rated operation can be stably performed.

1 is a schematic configuration diagram of an electric motor operating device according to a first embodiment of the present invention. The graph which shows the change of the frequency from the starting driving | operation of a motor of the motor operating device which concerns on the 1st Embodiment of this invention to a rated driving | operation. The schematic block diagram which shows the effect | action at the time of abnormality of the rated power supply apparatus of the electric motor operating device which concerns on the 1st Embodiment of this invention. The schematic block diagram of the electric motor operating device which concerns on the 2nd Embodiment of this invention. The schematic block diagram which shows the effect | action at the time of abnormality of the rated power supply apparatus of the motor operating device which concerns on the 2nd Embodiment of this invention. The schematic block diagram which shows the example which connected the some electric motor with respect to one rated power supply apparatus of the electric motor operating device which concerns on the 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
(Constitution)
Hereinafter, an electric motor driving apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic configuration diagram of an electric motor operating device according to a first embodiment of the present invention.
The motor operating device 1 includes a starting power supply device 2, a rated power supply device 3, a switching circuit 4, a filter circuit 5, a load input circuit 6, and a calculation unit 7. Moreover, the rated power supply device 3 has an abnormality determination function to be described later. A plurality of electric motors 11 are connected to the electric motor operating device 1 in a connection relationship described later, and the switching circuit 4, the filter circuit 5, and the load application circuit 6 are
The same number as each of the plurality of electric motors 11 is provided.

The on-site bus 10 is a bus that receives the on-site power 31 from an external power source and supplies the on-site power 31 to devices connected to the on-site bus 10. The plurality of electric motors 11 are motors that rotate by receiving power supply from the starting power supply device 2 or the rated power supply device 3. Further, the filter circuit 5 functions to improve the power factor of the electric motor 11 by shaping the waveform of the AC power supplied from the starting power supply device 2 and the rated power supply device 3 and removing noise. Further, the load input circuit 6 supplies electric power to the electric motor 11 by closing, and the electric motor 1 by opening.
1 is a circuit that can cut off the power supply to 1.

Hereinafter, the connection relationship between the motor operating device 1, the plurality of motors 11, and the in-house bus 10 will be described. The starting power supply device 2 and the rated power supply device 3 are connected to the in-house bus 10 so that the in-site power 31 can be received from the in-house bus 10. .

The switching power supply device 2 and the rated power supply device 3 are connected to the switching circuits 4 so that each of the switching circuits 4 can receive power from the switching power supply device 2 and the rated power supply device 3 in a switchable manner.
Is connected. Further, a filter circuit 5 and a load application circuit 6 are connected in series to the plurality of switching circuits 4, and an electric motor 11 is connected downstream of the plurality of load application circuits 6.

The calculation unit 7 is connected to the startup power supply device 2 so that the startup power supply device operation command 21 can be transmitted to the startup power supply device 2. Further, the calculation unit 7 is configured so that the rated power supply device operation command 22 can be transmitted to the rated power supply device 3.
And the rated power supply device 3 are connected. The calculation unit 7 also outputs a rated power supply device abnormality signal 25.
So that it can be received from the rated power supply device 3.
And are connected.

Further, the calculation unit 7 is connected to the plurality of switching circuits 4 so that the switching command 23 can be transmitted to each of the plurality of switching circuits 4. Further, the calculation unit 7 is configured to open / close command 2
4 is connected to each of the plurality of load input circuits 6 so that the arithmetic unit 7 and the plurality of load input circuits 6 are connected.

(Function)
The operation of the first embodiment of the present invention will be described below. First, an operation during normal operation in which no abnormality occurs in the rated power supply device 3 will be described.

The motor operating device 1 is configured such that the starting power supply device 2 sequentially supplies the starting power 32 to the plurality of motors 11 and accelerates to the rated operation, and the rated power supply device 3 accelerates the rated motor to the rated operation. On the other hand, it switches from the starting power supply device 2, supplies rated power 33 in parallel, and performs rated operation. Here, the rated power 33 is AC power having a rated frequency and a rated voltage with a constant frequency and voltage, and the motor 11 receives the rated power 33 and performs a rated operation. The starting power 32 is AC power whose frequency and voltage gradually increase from the starting frequency and starting voltage to the rated frequency and rated voltage of the rated power 33.
1 receives the starting power 32 and accelerates from the stopped state to the rotational speed of the rated operation.

Hereinafter, the operation of the motor 11a during the rated operation after the start-up operation, the motor 11b during the start-up operation, and the motor 11c before the start-up will be described.

First, the operation of the electric motor 11a will be described. The motor 11a during the rated operation has finished the start-up operation and has shifted to the rated operation. At this time, the calculation unit 7 has the rated power 3 required for the electric motor 11a.
3 is transmitted to the rated power supply device 3. The rated power supply device 3 receives the rated power supply device operation command 22 and receives the in-house power 31 of the in-house bus 10.
And the required rated power 33 is supplied to the electric motor 11a.

The computing unit 7 transmits a switching command 23a for receiving power from the rated power supply device 3 to the switching circuit 4a. The switching circuit 4 a receives the switching command 23 a and performs switching to receive power from the rated power supply device 3. Further, the calculation unit 7 transmits an opening / closing command 24a for closing the load application circuit 6a to the load application circuit 6a, and the load application circuit 6a is closed to supply the rated power 33 to the electric motor 11a.

Next, the operation of the electric motor 11b will be described. The electric motor 11b receives the starting power 32 and performs the starting operation. At this time, the calculation unit 7 transmits to the startup power supply device 2 a startup power supply device operation command 21 for supplying the startup power 32 necessary for the electric motor 11b. The starting power supply device 2 receives the starting power supply device operation command 21, converts the in-house power 31 of the in-house bus 10, and supplies the necessary starting power 32 to the motor 11b.

Further, the arithmetic unit 7 sends a switching command 23b for receiving power from the starting power supply device 2 to the switching circuit 4b.
Send to. The switching circuit 4 b receives the switching command 23 b and performs switching to receive power from the starting power supply device 2. Further, the calculation unit 7 transmits an opening / closing command 24b for closing the load application circuit 6b to the load application circuit 6b, and the load application circuit 6b is closed to supply the starting power 32 to the electric motor 11b.

When the electric motor 11b is accelerated to the rated operation, the calculation unit 7 generates the starting power 3 for the electric motor 11b.
2 is transmitted to the startup power supply device 2, and the startup power supply device 2 stops the supply of the startup power 32 to the motor 11b.

Moreover, the calculating part 7 transmits the rated power supply apparatus operation command 22 which supplies the rated power 33 required for the motor 11b in addition to the motor 11a to the rated power supply apparatus 3, and the rated power supply apparatus 3 Ten in-house powers 31 are converted to supply the required rated power 33 to the motors 11a and 11b. Further, the calculation unit 7 transmits a switching command 23b for receiving power from the rated power supply device 3 to the switching circuit 4b, and the switching circuit 4b performs switching for receiving power from the rated power supply device 3.

At this time, if the phase shift from the starting power 32 to the rated power 33 is large, the computing unit 7
The load input circuit 6b is once opened, and after switching from the starting power 32 to the rated power 33, an opening / closing command 24b for closing the timing at the timing when the phase of the rated power 33 matches the phase of the motor 11 is transmitted to the load input circuit 6b May be. As a result, starting power 32 to rated power 33
The load of the electric motor 11 in switching to can be reduced.

FIG. 2 is a graph showing changes in the frequency of the motor from the start-up operation to the rated operation of the electric motor operating device according to the first embodiment of the present invention. The electric motor 11b indicated by the broken line A increases the frequency and accelerates by receiving the starting power 32 indicated by the broken line B from the starting power supply device 2 during the starting operation. When the motor 11b accelerates to the rated frequency, the startup power supply device 2 stops supplying the startup power 32 to the motor 11b according to the startup power supply device operation command 21 from the calculation unit 7.

Further, according to the rated power supply device operation command 22 from the calculation unit 7, the rated power supply device 3
Switches the supply of the rated power 33 to the electric motor 11b from the starting power supply device 2. Here, as shown by a solid line C in FIG. 2, it is desirable that the rated power supply device 3 is accelerated in advance to the frequency of the rated power 33 and is on standby to supply the rated power 33. When the transition from the starting operation to the rated operation of the electric motor 11b is completed, the calculation unit 7 performs the starting operation for the next electric motor 11c.

Finally, the operation of the electric motor 11c will be described. The electric motor 11c is in a stopped state before starting. Therefore, the arithmetic unit 7 transmits a switching command 23c that does not receive power from both the startup power supply device 2 and the rated power supply device 3 to the switching circuit 4c, and the switching circuit 4b is connected to the startup power supply device 2 and the rated power. Switching to a position where no power is received from any of the supply devices 3 is performed. Further, the calculation unit 7 may transmit an opening / closing command 24c for opening the load application circuit 6c to the load application circuit 6c, and the load application circuit 6c may be opened to cut off power supply to the electric motor 11b.

Next, the operation when an abnormality occurs in the rated power supply device 3 will be described. FIG. 3 is a schematic configuration diagram showing an operation when the rated power supply device of the motor operating device according to the first embodiment of the present invention is abnormal. The rated power supply device 3 has an abnormality determination function inside. As the abnormality determination function, a comparison with a normal value of the voltage or frequency of the rated power supply device 3 or a deterioration determination by measuring the capacitance of the smoothing capacitor can be applied as a diagnostic function.

In the following description, it is assumed that the motors 11a and 11b have finished the start-up operation and have shifted to the rated power before the abnormality of the rated power supply device 3, and the motor 11c has not been started up.

First, the operation of the electric motors 11a and 11b will be described. When an abnormality occurs in the rated power supply device 3, the rated power supply device 3 transmits a rated power supply device abnormality signal 25 to the calculation unit 7. When the arithmetic unit 7 receives the rated power supply apparatus abnormality signal 25, the arithmetic unit 7 is one in which the connected motor 11 is performing the rated operation among the plurality of load input circuits 6, that is, the load input circuit 6a.
, 6b, open / close commands 24a, 24b for opening are respectively transmitted. Load application circuit 6a,
6b receives and opens the opening / closing commands 24a and 24b, and the load on the motor 11 due to the excessive power supply due to the abnormality of the rated power supply device 3 or the sudden change in frequency or voltage is reduced.

Further, the calculation unit 7 causes the starter power supply device 2 to supply the rated power 33 to the motors 11a and 11b performing the rated operation among the plurality of motors 11.
1 is transmitted. The startup power supply device 2 receives the startup power supply device operation command 21 and supplies the required rated power 33 to the motors 11 a and 11 b using the in-house power 31 of the in-house bus 10.
Here, it is desirable that the startup power supply device 2 is accelerated to the rated frequency and kept in standby so that the rated power 33 can be always supplied.

Further, the calculation unit 7 switches the switching circuit 4 so that the connected motor 11 is performing the rated operation, that is, the switching circuits 4a and 4b so as to receive power from the starting power supply device 2. The switching commands 23a and 23b to be transmitted are transmitted. The switching circuits 4 a and 4 b receive the switching command 23 and perform switching to receive power from the starting power supply device 2.

Further, the calculation unit 7 opens and closes the load application circuits 6a and 6b by an opening / closing command 24a for performing a closing operation.
24b is transmitted. The load application circuits 6a and 6b receive and close the open / close commands 24a and 24b, and supply the rated power 33 from the starting power supply device 2 to the respective motors 11a and 11b.

Next, the operation of the electric motor 11c will be described. The electric motor 11c is before starting. Therefore, the arithmetic unit 7 transmits a switching command 23b that does not receive power from both the startup power supply device 2 and the rated power supply device 3 to the switching circuit 4c, and the switching circuit 4c is connected to the startup power supply device 2 and the rated power. Switching to a position where no power is received from any of the supply devices 3 is performed. Further, the arithmetic unit 7 may transmit an opening / closing command 24c for opening the load application circuit 6c to the load application circuit 6c, and the load application circuit 6c may be opened to cut off the power supply to the electric motor 11b.

Even when the motor 11c is in the starting operation, if the rated power 33 is supplied before the motor is accelerated to the rated operation, a load may be generated on the motor 11c. The switching circuit 4b includes a starting power supply device 2 and a rated power supply device 3
Switch to a position where no power is received from any of the above.

(effect)
According to the first embodiment of the present invention, starting power is sequentially supplied to the plurality of motors 11 by the starting power supply device 2 to accelerate to rated operation, and the plurality of motors 11 are driven by the rated power supply device 3.
By switching the startup power supply device 2 to supply the rated power to the one accelerated to the rated operation, the capacity of the startup power supply device 2 can be reduced, and the startup power supply device 2 Rated operation can be performed without operating.

Further, when an abnormality occurs in the rated power supply device 3, the startup power supply device 2 switches the rated power from the rated power supply device 3 and supplies it to the motor 11 that is in rated operation. Thus, the plurality of electric motors 11 can be rated.

(Second Embodiment)
(Constitution)
Hereinafter, an electric motor driving apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 4 to 6. The same reference numerals are given to the same parts as those of the electric motor operating device according to the first embodiment,
A description of the same configuration is omitted.

FIG. 4 is a schematic configuration diagram of an electric motor operating device according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the same number of rated power supply devices 3 as the plurality of electric motors 11 are provided. The rated power supply device 3 is connected to each of the plurality of switching circuits 4 so that the plurality of switching circuits 4 can be supplied with power from each of the plurality of rated power supply devices 3.

The plurality of rated power supply devices 3 are rated powers 3 required by the motors 11 connected thereto, respectively.
2 is supplied, and the amount of supplied power 32 is not changed in accordance with the number of motors 11 that are rated at operation as in the first embodiment described above.

(Function)
The operation of the second embodiment of the present invention will be described below. First, the normal operation in which no abnormality occurs in the rated power supply device 3 will be described. Hereinafter, the operation of the motor 11a during the rated operation after the start-up operation, the motor 11b during the start-up operation, and the motor 11c before the start-up will be described.

First, the operation of the electric motor 11a will be described. The motor 11a during the rated operation has shifted to the rated operation after finishing the starting operation described later. At this time, the calculation unit 7 transmits a rated power supply device operation command 22 for supplying the rated power to the motor 11 to the rated power supply device 3a, and the rated power supply device 3 converts the in-house power 31 of the in-house bus 10 and The required rated power is supplied to the electric motor 11a.

The computing unit 7 transmits a switching command 23a for receiving power from the rated power supply device 3a to the switching circuit 4a. The switching circuit 4a receives the switching command 23a and performs switching to receive power from the rated power supply device 3a. Further, the calculation unit 7 transmits an opening / closing command 24a for closing the load application circuit 6a to the load application circuit 6a, and the load application circuit 6a is closed to supply the rated power 33 to the electric motor 11a.

Next, the operation of the electric motor 11b will be described. The electric motor 11b receives the starting power 32 from the starting power supply device 2 and performs the starting operation. At this time, the calculation unit 7 transmits an activation power supply device operation command 21 for supplying the activation power 32 to the electric motor 11 b to the activation power supply device 2, and the activation power supply device 2 converts the in-house power 31 of the in-house bus 10. Thus, the necessary starting power 32 is supplied to the electric motor 11b.

The arithmetic unit 7 transmits a switching command 23b for receiving power from the starting power supply device 2 to the switching circuit 4b, and the switching circuit 4b performs switching for receiving power from the starting power supply device 2. Further, the calculation unit 7 transmits an opening / closing command 24b for closing the load application circuit 6b to the load application circuit 6b, and the load application circuit 6b is closed to supply the starting power 32 to the electric motor 11b.

When the starting power 32 is supplied to the motor 11b and accelerated to the rated operation, the calculation unit 7 transmits the starting power supply device operation command 21 for stopping the supply of the starting power 32 to the motor 11b to the starting power supply device 2. Then, the starting power supply device 2 stops supplying the starting power 32 to the electric motor 11b. The computing unit 7 transmits a rated power supply device operation command 22b for supplying the rated power 33 to the electric motor 11b to the rated power supply device 3b. The rated power supply device 3b converts the in-house power 31 of the in-house bus 10 and The required rated power is supplied to the electric motor 11b.

The calculation unit 7 also sends a switching command 23b for receiving power from the rated power supply device 3b to the switching circuit 4b.
The switching circuit 4b performs switching to receive power from the rated power supply device 3b. Further, the computing unit 7 may open the load application circuit 6b once and send an open / close command 24b to the load application circuit 6b to close the switch after switching from the starting power 32 to the rated power 33.

Finally, the operation of the electric motor 11c will be described. The electric motor 11c is before starting. Therefore, the arithmetic unit 7 transmits a switching command 23c that does not receive power from both the startup power supply device 2 and the rated power supply device 3c to the switching circuit 4c, and the switching circuit 4b includes the startup power supply device 2 and the rated power. Switching to a position where no power is received from any of the supply devices 3c.

Next, an operation when an abnormality occurs in the rated power supply device 3b among the rated power supply devices 3a, 3b, and 3c will be described. FIG. 5 is a schematic configuration diagram showing an operation when the rated power supply device of the motor operating device according to the second embodiment of the present invention is abnormal. The rated power supply device 3b transmits a rated power supply device abnormality signal 25b indicating the occurrence of abnormality to the calculation unit 7.

Here, it is assumed that the motors 11a and 11b have finished the start-up operation and have shifted to the rated power before the abnormality of the rated power supply device 3, and the motor 11c is before the start-up.

First, the operation of the electric motors 11a and 11b will be described. The rated power supply device 3b transmits a rated power supply device abnormality signal 25b to the computing unit 7 when an abnormality occurs in the rated power supply device 3b. When the arithmetic unit 7 receives the rated power supply device abnormality signal 25b, the rated power supply device 3 among the plurality of electric motors 11 has an abnormality in the startup power supply device 2,
That is, the starting power supply device operation command 21 for supplying the rated power 33 to the motor 11b is transmitted. The startup power supply device 2 receives the startup power supply device operation command 21 and receives the on-site bus 10
The required rated power 33 is supplied to the electric motor 11b using the in-house electric power 31.

Further, the arithmetic unit 7 outputs a switching command 23b for switching the power received from the starting power supply device 2 to the switching circuit 4 in which the rated power supply device 3 is abnormal, that is, the switching circuit 4b. Send. The switching circuit 4 b receives the switching command 23 and performs switching to receive power from the startup power supply device 2.

Next, the operation of the electric motor 11c will be described. The electric motor 11c is before starting. Therefore, the arithmetic unit 7 transmits a switching command 23b that does not receive power from both the startup power supply device 2 and the rated power supply device 3 to the switching circuit 4c, and the switching circuit 4c is connected to the startup power supply device 2 and the rated power. Switching to a position where no power is received from any of the supply devices 3 is performed.

The present embodiment can be modified as follows. FIG. 6 is a schematic configuration diagram showing an example in which a plurality of electric motors are connected to one rated power supply device of the electric motor operating device according to the second embodiment of the present invention. In this case, for example, two to three electric motors 11 are grouped into a plurality of groups, and one rated power supply device 3 is connected to the grouped electric motors 11.

The rated power supply device 3 supplies the rated power 33 necessary for rated operation of the motors 11 of the connected group. Furthermore, it is assumed that the startup power supply device 2 supplies startup power 32 necessary for starting up the motors 11 of each group simultaneously. In this configuration, the starting power supply device 2 sequentially supplies the starting power 32 for each group and accelerates to the rated operation, and the rated power supply device 3 accelerates the motor 11 of the connected group to the rated operation. Switch from the startup power supply device 2 to supply the rated power 33 to this group. Further, when the rated power supply device 3 is abnormal, the startup power supply device 2 switches the rated power 33 from the rated power supply device 3 to a group to which the abnormal rated power supply device 3 is connected among the plurality of groups. To do.

Also in the first embodiment described above, it is possible to connect a plurality of motors 11 grouped to one switching circuit 4. In this configuration, the startup power supply device 2 sequentially supplies the startup power 32 for each group and accelerates to rated operation, and the rated power supply device 3 is a group in which the motor 11 is accelerated to the rated operation among a plurality of groups. In contrast, the rated power 33 is supplied by switching from the starting power supply device 2. Furthermore, the rated power supply device 3
When the abnormality occurs, the startup power supply device 2 switches from the rated power supply device 3 and supplies the rated power 33 to the group in which the motor 11 is in rated operation.

(effect)
According to the second embodiment of the present invention, by providing the rated power supply device 3 in each of the plurality of electric motors 11, the capacity of the rated power supply device 3 can be reduced. Furthermore, when the abnormality occurs in the rated power supply device 3, the startup power supply device 2 only needs to supply the rated power that is supplied by the abnormal rated power supply device 3, so that the capacity of the startup power supply device 2 is further reduced. can do.

Needless to say, the embodiment of the present invention is not limited to the above-described embodiment. For example, the number and capacity of the motors 11, the voltages and frequencies of the in-house power 31, the starting power 32, and the rated power 33 can be appropriately changed according to the scale and performance requirements of the device in which the motor 11 is used.

The starting power supply device 2 and the rated power supply device 3 not only convert the in-house power 31 of the common in-house bus 10 but also receive and convert the in-house power 31 of the independent in-house bus 10. Good.

DESCRIPTION OF SYMBOLS 1 ... Electric motor driving device 2 ... Starting power supply device 3 ... Rated power supply device 4 ... Switching circuit 5 ... Filter circuit 6 ... Load input circuit 7 ... Calculation part 10- ..In-house bus 11 ... Motor 21 ... Starting power supply device operation command 22 ... Rated power supply device operation command 23 ... Switching command 24 ... Open / close command 25 ... Rated power supply device abnormality Signal 31 ... In-house power 32 ... Starting power 33 ... Rated power

Claims (8)

A starting power supply device that converts the in-house power of the in-house bus to starting power that gradually increases in frequency and voltage, and supplies this starting power to a plurality of motors in order to accelerate to rated operation;
The in-house power is converted into rated power, and a rated power supply device that supplies the rated power by switching from the starting power supply device for those accelerated to the rated operation among the plurality of electric motors,
The starting power supply device switches the rated power from the rated power supply device and supplies the rated power to a motor during rated operation when the rated power supply device is abnormal. apparatus. A starting power supply device that converts the in-house power of the in-house bus to starting power that gradually increases in frequency and voltage, and supplies this starting power to a plurality of motors in order to accelerate to rated operation;
A rating that is connected to each of the plurality of electric motors, converts the in-house power into rated power, and switches the starting power supply device to supply the rated power when the connected motor is accelerated to the rated operation. A power supply device,
When the rated power supply device is abnormal, the start-up power supply device is configured to output the rated power from the rated power supply device with respect to an abnormality in the connected rated power supply device among the plurality of electric motors. An electric motor operating device characterized by being switched and supplied. A starting power supply device that converts the in-house power of the in-house bus into starting power that gradually increases in frequency and voltage, and supplies this starting power sequentially to a plurality of grouped motors for each group and accelerates to rated operation;
A rated power supply device that converts the in-house power into a rated power and supplies the rated power by switching from the starting power supply device to the group in which the motor is accelerated to the rated operation in the group. ,
The startup power supply device switches the rated power from the rated power supply device when the rated power supply device is abnormal, and supplies the motor to the group in which the motor is rated in operation. Electric motor driving device. A starting power supply device that converts the in-house power of the in-house bus into starting power that gradually increases in frequency and voltage, and supplies this starting power sequentially to a plurality of grouped motors for each group and accelerates to rated operation;
Connected to each of the groups, converts the in-house power into rated power, and supplies the rated power by switching from the starting power supply device when the motors of the connected group are accelerated to the rated operation With a rated power supply device,
The startup power supply device switches the rated power from the rated power supply device to the group to which the abnormal rated power supply device is connected among the groups when the rated power supply device is abnormal. An electric motor driving device characterized by that. A switching circuit is further provided upstream of each of the plurality of electric motors;
5. The electric motor operating device according to claim 1, wherein the switching power supply is switched from the starting power supply device and the rated power supply device by the switching circuit. 6. The load circuit which supplies the electric power from the said starting power supply apparatus and the said rated power supply apparatus by closure, and interrupts | blocks by open | release is provided in the downstream of each said switching circuit. Item 6. The electric motor operating device according to any one of Items 5. The motor operating device according to any one of claims 1 to 6, further comprising a filter circuit connected in series to each of the plurality of electric motors and rectifying the starting power and the rated power. . An electric motor starting operation step of converting the in-house electric power of the in-house bus into starting electric power that gradually increases in frequency and voltage, and sequentially supplying this starting electric power to a plurality of motors to accelerate to rated operation;
A motor rated operation process for converting the in-house power into a rated power and supplying the rated power to a plurality of the motors accelerated to the rated operation,
And a step of supplying the rated power to the motor using a starting power supply means in the motor starting operation step when the rated power supply is abnormal in the motor rated operation step.

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