JPS59149791A - Plural motor driving device - Google Patents

Abstract

PURPOSE:To enable to continuously operate motors even when duplicate power sources are defective by dividing a plurality of motors into N groups, connecting the divided groups to arbitrary N pieces of power sources in M pieces of power sources at 1:1, and connecting the contactor with the power source groups and plural motors. CONSTITUTION:If a power source 1-3 becomes defective and stopped, contactors 4-1 to 4-4 remain ''closed'', a contactor 5-1 is ''open''. A contactor 5-2 is ''closed''. In other words, the first group, the second group are energized only by the power source 1-1, and the third and fourth groups are energized only by the power source 1-2. Two power sources 1-1, 1-2 are independently driven by half of a full load according to the state variation of the above contactors. Therefore, even if any power source becomes defective and stopped without waiting the defect repair of the power source 1-3, the half of the full load becomes possible to continue operating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a motor drive device for supplying power to a plurality of motors by connecting a plurality of power supplies such as constant voltage and constant frequency power supplies in parallel with redundancy.

[Technical background of invention! ] Conventionally, as a motor drive device for driving loads such as a plurality of electric motors, a redundant drive system in which a plurality of power supplies such as constant voltage constant frequency power supplies are connected in parallel has been widely used. A redundant system is one in which the total capacity of multiple power supplies is made to have more margin than the capacity required to drive the load. Typical examples are a 1 out of 2 system and a 2 out of 3 system. There is. This MeiN11 book briefly explains the 20ut of 3 system.

FIG. 1 is a diagram showing the equipment configuration of a 2 out of 3 system. In Figure 1, three electric appliances [1-1, 1-2, 1
-3 output sections are connected in parallel, and a common bus section 2 is connected to each power supply. The common bus section 2 is appropriately branched according to the number of the plurality of electric motors 3-1 to 3-8 that are loads, and is connected to the load side via contactors 4-1 to 4-4, respectively. Here, the number and quantity of the electric motors 3-1 to 3-8 and the contactors 4-1 to 4-4 are essentially irrelevant, so their explanation will be omitted.

The capacity of each of the three power supplies 1-1.1-2.1-3 described above is 50% of the capacity required to drive the electric motors 3-1 to 3-8, which are loads.

In other words, the total capacity of the three units will be 150%.
Even if one of power supplies 1-1.1-2.1-3 fails and stops, the total capacity of the remaining two power supplies will be 100% of the load capacity, and it will not be enough to drive the load. Sufficient capacity can be secured. By creating a redundant system like this, it is possible to improve reliability, but of course the equipment (
Initial) Cost increases as redundancy is adopted.

Therefore, considering both reliability and equipment cost, usually 1 o
The utO[2 (consisting of two power supplies with power supply capacity equal to the load capacity) or 2 out' of 3 systems are widely used.

[Problems with the background technology] In the 2 out of 3 system mentioned above, 1 out of 3 power supplies
Even if one of the machines fails, the load operation can be continued, but if one out of two machines fails and stops, it is naturally impossible to continue the load operation. Normally, one out of three power supplies fails and stops, and it is extremely rare for one out of two power supplies to fail within a short period of time (within a time shorter than the time it takes to repair the failed power supply). However, power outages are not limited to failures; there are also cases in which one power supply is shut down sequentially for inspection, etc., and when a failure occurs, it may take longer to repair depending on the cause of the failure. However, it cannot be said that the period during which the two power supplies are in operation is negligibly short compared to the average failure time of the power supplies.

As mentioned above, the conventional system shown in FIG. 1 has the disadvantage that if one of the 12 electric appliances fails and stops while it is in operation, the entire load will come to a halt.

[Object of the Invention] The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to solve the following problems: N out of M <N≧2, M=N+1
) In a redundant system, when one power supply is out of use due to maintenance or failure, even if one power supply fails and stops, full load (If-1)/N can continue to operate. An object of the present invention is to provide a plurality of electric motor drive devices.

[Summary of the invention] The present invention provides N out of M (N≧2, M=N+1
)3- In a plurality of motor drive devices consisting of M power supplies and a plurality of motors driven by the power supplies, which constitute a redundant system, the plurality of motors are divided into N groups, and each of these divided One-on-one with any N power supplies in M power supplies
The present invention is characterized in that a contactor having a connectable function and corresponding to the power supply group is connected to a circuit that connects the power supply group and a plurality of electric motors.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to FIG.

As shown in Figure 2, the same parts as in Figure 1 are indicated by the same symbols, the power supply side is a 2utof3 system, and the load capacity is 5.
It is composed of three power supplies 1-1.1-2.1-3 with a capacity of 0%. The output parts of the electric currents 11-1 and 1-2 can be connected or disconnected via a contactor 5-1. Similarly, the output parts of power supplies 1-2 and 1-3 are connected by a contactor 5-2. The load motor is 4
divided into groups. Now move the electric motor 3-1.3-2 to the fourth
- 1st group, 3-3.3-4 in 2nd group, 3-5.3-6 in 3rd group
Group 3-7.3-8 is called the fourth group. The first group is connected to the output section of the power source 1-1 via the contactor 4-1, and the second group is connected to the output section of the power source 1-1 via the contactor 4-2. Also, these first
The group and the second group are connected to the electric terminal 8PiI via the contactor 5-1.
-2 is also connected.

Similarly, the third group is connected to the output section of the power source 1-3 via the contactor 4-3, and the fourth group is connected to the output section of the power source 1-3 via the contactor 4-4. And the third group and the fourth group are contactors 5
-2 to the output of the power source 1-2. Here, a breaker 6-1.6-2.6-3 is provided at each output part of the power source 1-1.1-2.1-3, and the power source 1-1.1-2.1 -3 can be separated from the drive system.

Next, the operation of the plurality of electric motor drive devices according to the present invention will be explained. The principle of the device of the present invention is that if any one of the three power supplies stops due to maintenance or failure, the output parts of the remaining two power supplies (the operating outputs of the three power supplies are connected to each other). The method of connecting the power supply and load is changed so that each of the two power supplies independently drives half of the motors in the load.

That is, in FIG. 2, power supply 1-1.1-2.1-3
When all of the contactors 4-1 to 4-4 and 5-1.5-2 are in the "closed" state. In this state, the circuit breakers 6-1.6-2.6-3 of the output parts of the three power supplies m1-1.1-2.1-3 are all in the "closed" state, and the three power supplies 1- The output parts of 1.1-2.1-3 are connected in parallel, and the three power supplies 1-1.1-2.1-3 are connected in parallel.
are operated in parallel, and the load motors 3-1 to 3-8
is supplying power.

Assume that the power supply 1-3 fails and stops in this state. Power supply 1-3 follows the normal internal sequence and connects to breaker 6-3.
is in the "open" state and disconnected from the drive system. Next, as shown in FIG. 3, the state of each contactor (currently all "closed") changes. In other words, contactors 4-1 to 4
-4 remains "closed" 7-, and contactor 5-1 becomes "open".

Contactor 5-2 remains "closed". When the state of each contactor changes in this way, the power supply state to the load changes as follows. In other words, the power supply 1-1 is connected to the first group and the second group.
Power is supplied only from the power source 1-2 to the third group and the fourth group. In other words, in the past, electrical IT was broken! 1-3
Two reliable power supplies except 1-1.1-2 were running in parallel (with their outputs connected) and supplying power to the entire load, but due to the above change in the contactor status, the two Noden 8!
1-1, 1-2 will each independently drive half of the total load. In this way, two power supplies 1-1.1-2
If you disconnect the power supplies, even if one of the power supplies fails and stops without waiting for power supplies 1 to 3 to be repaired, half of the total load (the load connected to the power supply that does not fail) will continue to operate. Continuation becomes possible. In particular, if the electric motors 3-1 to 3-8, which are loads, are functionally independent in each group, it is possible to reduce the damage caused by a decrease in plant productivity by half.

- Next, as shown in Figure 3, the two power supplies 1-1.1-
Let's return to the case where 2 is operating in good condition.

Once the repair of the failed power supply 1-3 is completed, the power supply 1-3 will be restored.
After restarting 3 with no load, if the breaker 6-3 and contactor 5-1 are closed again, the three power supplies 1-1.1
-2.1-3 will return to its "initial state" in which it was operating normally.

The above explanation deals with the case where the power supply 1-3 fails and stops, but the same effect can also be achieved when the power supply 1-1 or 1-2 fails and stops by changing the state of each contactor as shown in the table below. You can get the effect.

(The following is a blank space) 0-Table O Contactor "Open" Contactor is "closed" (The following is a blank space) [Effects of the Invention] As detailed above, according to the present invention, N out of M
In a (N22, M=N+1) redundant system, when one power supply is stopped due to maintenance or failure, even if one more power supply fails and stops, the total load is (N-1)/N This has the effect of allowing you to continue driving.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing a conventional multiple electric motor drive device.
FIG. 2 is a system diagram showing an embodiment of a plurality of electric motor drive devices according to the present invention, and FIG. 3 is a system diagram for explaining the operation of FIG. 2. 1-1.1-2.1-3...Power supply 2...Common bus section 3-1 to 3-8
...Electric motor 4-1 to 4-4.5-1.5-2...Contactor 6-
1.6-2.6-3...Patent attorney representing circuit breaker
Suyama Sa - 11-

Claims (1)

[Claims] (1) In a plurality of motor drive devices consisting of M power supplies constituting an N out of M (N, t2, M=N+1) redundant system and a plurality of motors driven by the power supplies, A number contactor having a function of dividing the plurality of electric motors into N groups and connecting each divided group to any N power supplies among the M power supplies in a one-to-one correspondence. is interposed in a circuit connecting the power supply group and the plurality of motors.