JPH0530764A - Starting speed controller for motor - Google Patents

Abstract

PURPOSE:To alleviate an operator's load by automatically setting a starting speed in future based on the operational achievement of each of a plurality of motors and starting the each motor and to delay deterioration of the motor due to a continuous use, etc., in a starting speed controller for the motor to switch the motors while maintaining the starting speed ratio of the motors constant. CONSTITUTION:The starting speed controller for a motor comprises counting means 8 for recording starting speeds of motors 5A, 5B, switching and setting means 9 for deciding the using ratio of the motors 5A, 5B based on a difference of the starting speeds of the motors 5A, 5B, recorded in the means 8, and switching means 7 for switching-starting the motors 5A, 5B in response to the using ratio decided by the means 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor starting number control device for switching and using a plurality of motors while keeping the starting number ratio of each motor constant.

[0002]

2. Description of the Related Art Conventionally, a motor used in a place where reliability is required, for example, a pressure oil pump drive motor used in a governor of a hydroelectric power plant or a water supply pump drive motor of a thermal power plant is Multiple units are provided as spares in the event of an accident.

FIG. 6 is a block diagram showing an apparatus described on page 12 of Electric Cooperative Research Vol. 42, No. 2, "Design Guidelines for Water Turbine Ancillary Equipment," issued by the Electric Cooperative Research Institute, October 1986, for example. Therefore, FIG. 6 shows an example of a pressure oil device having a regular service and a backup system.

In FIG. 6, 1A is a normal pressure oil pump, 1
B is a preliminary pressure oil pump, 2 is a water wheel, 3 is a pressure oil tank, 4 is an oil collection tank, and the oil in this oil collection tank 4 is compressed by the regular pressure oil pump 1A or the preliminary pressure oil pump 1B.
A route for sending pressure oil to the water wheel 2 is shown.

Both the normal pressure oil pump 1A and the preliminary pressure oil pump 1B are driven by a motor (not shown). However, when only the normal pressure oil pump 1A is used, the parts on the pump 1A side are As the deterioration will increase,
The spare pressure oil pump 1B can be switched by manual operation.
Is being used.

In this case, the switching between the motor for driving the regular pressure oil pump 1A and the motor for driving the preliminary pressure oil pump 1B is conventionally performed by the operator's judgment and operation.

[0007]

[Problems to be Solved by the Invention] However, in the past,
Such switching operation of a plurality of motors is determined by the operator counting the number of times of starting the motor or judging by the counter of the motor.
It is necessary to determine the motor to be used in consideration of the number of times of start up to now, which imposes a heavy burden on the operator.

Further, if a motor having a small number of times of use is continuously used to match the number of times of use of another motor in order to keep the ratio of the number of times of starting of each motor constant, the deterioration of the motor is accelerated. There was also.

The present invention has been made in order to solve the above problems, and the operator can automatically start the motors by automatically setting the number of start-ups in the future based on the usage record of the motors. It is an object of the present invention to provide a motor start-up frequency control device that not only reduces the load but also delays motor deterioration due to continuous use.

[0010]

A motor start-up number control device according to the present invention counts the number of start-ups of each motor in order to switch and start a plurality of motors while keeping the start-up ratio of each motor constant. Means, switching setting means for determining a usage ratio of each motor based on a difference in the number of times of starting each motor recorded in the counting means, and switching each motor according to the usage ratio determined by the switching setting means・ It is equipped with a switching means to be activated.

Further, when the switching setting means determines the usage ratio of each motor, it is arranged so that one motor is not continuously activated more than a predetermined number of times.

[0012]

In the motor starting frequency control device according to the present invention,
The number of times of starting each motor is recorded in the counting means, and the use ratio of each motor is determined by the switching setting means based on the difference in the number of times of starting between the motors. Switched / started. Therefore, even if the operator does not consider the number of times of starting each motor, a plurality of motors are automatically switched and started while keeping the ratio of the number of times of starting each motor constant.

Further, when the switching setting means determines each usage rate, it is possible to prevent continuous use of a motor having a small number of starts by restricting one motor from being continuously started more than a predetermined number of times.

[0014]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 5A and 5B are motors,
Reference numeral 6 is a start switch operated by an operator to instruct whether to manually switch / start the motors 5A and 5B or perform automatic switching. The start switch 6 is configured as shown in FIG.

In FIG. 2, "motor A", "automatic", and "motor B" are characters written on the dial on the periphery of the start switch 6, and "motor A" and "motor B" are motors, respectively. It corresponds to 5A and 5B.

Then, as shown in FIG. 3, by rotating the start switch 6 to the position of the "motor A" or "motor B", the motor 5A or 5B is manually started, while the start switch 6 is turned on. The motor starting frequency control device of this embodiment operates by rotating the motor to the "automatic" position.

Further, 7 is a switching circuit (switching means) which is switched and driven by a switching setting device which will be described later, and 8 is a digital memory (recording the number of times of starting each motor 5A, 5B in response to the switching operation information of the switching circuit 7 ( (Counting means), 9 is a switching setting device (switching setting means) for determining the usage ratio of each motor 5A, 5B based on the difference in the number of times of starting each motor 5A, 5B recorded in the digital memory 8, Switching circuit 7
According to the usage rate determined by the switching setting device 9,
As shown in FIG. 3, the motors are switched and driven, and the motors 5A and 5B are switched and activated.

Further, 10 is a deterioration information input section for inputting deterioration information (for example, continuous use status) of the respective motors 5A and 5B to the switching setting device 9. In the present embodiment, the switching setting device 9 means indicates the respective usage ratios. In determining, the deterioration information of each motor from the deterioration information input means is taken into consideration.

Next, the operation of the apparatus of this embodiment will be described. Consider a case where the two motors 5A and 5B have the same number of times of use (number of times of start-up) and the same deterioration seen from the number of times of motor use. Further, a case will be described here in which the deterioration information from the deterioration information input unit 10 is not added.

There is a difference in the actual use of the motors 5A and 5B, and the sum of the number of times of use of the two motors 5A and 5B is X1,
When the difference in the number of times the motors 5A and 5B are used is Y ₁ times, the value of the digital memory 8 of this embodiment is the point a in FIG.
It is represented by.

It should be noted that the Y axis in FIG. 4 has ΣMA-ΣMB
(Difference in the number of times of use) is entered, but for the sake of explanation, it is assumed here that the number of times of use of the motor 5A is larger than that of the motor 5B.

Now, for some reason (for example, the circuit of the motor 5B is out of order), the operator switches the starting switch 6 to the motor 5A (motor A) side, and the motor 5
When A is used, the count value in the digital memory 8 moves from point a to point b in FIG.

Then, when the start switch 6 is switched to the automatic position, the switch setter 9 causes the ΣMA at point b in FIG.
Since −ΣMB indicates a positive value of Y ₁ +1, the switching command is issued to the switching circuit 7 so that the motor 5B is activated next time.
To start the motor 5B.

As a result, the number of times the motors 5A and 5B are used and ΣMA-ΣMB change from point b to point c. Even if the motor 5A fails at the point c and the switching circuit 7 selects the motor 5B, the count value of the digital memory 8 is decremented and the point moves to the point d.

On the contrary, even if the motor 5B fails at the point d, the count value of the digital memory 8 is added to the point d.
When the motor 5B is restored from the position to the point e, the number of times the motor is used is adjusted, and the point f at which ΣMA−ΣMB = 0 is satisfied.
Up to, the motor 5B is selected and activated.

By making such use selection,
The motors 5A and 5B can be automatically made the same number of times of use (that is, the start-up ratio of each motor 5A, 5B can be made constant), and the motor deterioration seen from the number of times of use can be made the same. .

Example 2. A modified example of the means for determining the usage ratio of the motors 5A and 5B in the switch setting device 9 of the device configured similarly to FIG. 1 will be described below. In this example,
The function-f (x) determined by the difference (x) in the number of times the motors 5A and 5B are started determines the future usage rate of the motors 5A and 5B.

FIG. 5 shows the sum of the numbers of uses of the motors 5A and 5B when this function -f (x) is used, and the motors 5A and 5B.
The relationship with the difference in the usage record of B is shown. Example 1 4 in the case of using the apparatus of FIG.
The points g to k in FIG. 5 make the same movement, but the points k to l in FIG. 5 are the same if the motor 5B is used twice so as not to continuously use the motor 5B. It is designed to use 5A once.

In this way, the number of times of use is set by the function -f (x), and the continuous use of the motors 5A and 5B is regulated / prevented.

Example 3. In consideration of the deterioration information of the respective motors 5A and 5B from the deterioration information input unit 10 described above,
Example 2. Function-f (x) in the above is obtained from the motor deterioration information. For example, if the deterioration of the motor 5A is fast, the usage ratio of the motors 5A and 5B is calculated as follows.
If is used three times, the motor 5A is used once, and the target value of the final difference in the number of times of use is not 0 but is set to another value.

If the difference in the number of times of use is set to a value other than 0, the deterioration states of the respective motors 5A and 5B are different, and the difference in the timing of replacement of parts deterioration occurs between the motors 5A and 5B. The maintenance work can be performed in the order from the motor 5A to the motor 5B (or in the reverse order) without stopping.

Example 4. The switching setter 9 of the above embodiment is provided with AI (artificial intelligence) by an inference mechanism, and the motors 5A, 5
When there is a difference in the capacity of B, start-up cost, usable time, etc., by inputting the knowledge base of a motor switching expert (expert) in advance, the switch setter 9 minimizes motor deterioration and starts the motor. The ratio of the number of activations that minimizes the cost will be required.

In the above embodiment, the case in which two motors are provided has been described, but the present invention is not limited to this, and the above embodiment is also applicable to the case in which three or more motors are provided. The same effect can be obtained by applying in the same manner as.

Further, in the above embodiment, each motor 5A, 5A
The switching of the motors 5A and 5B is set according to the number of times of use of B. Information about the usage time of each of the motors 5A and 5B is added to this, for example, when the usage time of each of the motors 5A and 5B is 100 hours. The calculation may be performed assuming that the number of times is one. As a result, not only deterioration due to the number of times the motor has been used but also deterioration due to usage time can be made the same for each motor.

[0035]

As described above in detail, according to the motor start-up number control device of the present invention, the start-up number of each motor is recorded in the counting means, and each start-up number is recorded based on the difference between the start-up numbers. The motor usage rate is determined by the switching setting means, and each motor is configured to be switched / started by the switching means according to the usage rate.Therefore, the number of motor starts in the future is automatically set and each motor is started. The effect is that the burden on the operator can be greatly reduced.

Further, when the switching setting means determines each usage rate, it is possible to prevent a motor having a small number of start-ups from being continuously used by restricting one motor from continuously starting more than a predetermined number of times. There is also an effect that the deterioration of the motor can be delayed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a motor start count control device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a start switch in the present embodiment.

FIG. 3 is a circuit diagram showing a configuration of a start switch and a switching circuit in the present embodiment.

FIG. 4 is a graph showing the number of times each motor is used to explain the operation of this embodiment.

FIG. 5 is a graph showing the number of times each motor is used to explain the operation of another embodiment of the present invention.

FIG. 6 is a configuration diagram showing an example of a general pressure oil device having a regular pressure oil pump and a preliminary pressure oil pump.

[Explanation of symbols]

5A, 5B motor 6 Start switch 7 Switching circuit (switching means) 8 Digital memory (counting means) 9 Switch setting device (switch setting means) 10 Degradation information input section

Claims (2)

[Claims] 1. A count means for recording the number of times of starting each motor so as to switch and start a plurality of motors while keeping the ratio of the number of times of starting each motor constant, and the number of times of starting each motor recorded in the counting means. A switching setting means for determining the usage ratio of each motor based on the difference between the motor and a switching means for switching / starting each motor according to the usage ratio determined by the switching setting means. Motor start frequency control device. 2. The motor start number control device according to claim 1, wherein the switching setting means prevents one motor from being continuously started more than a predetermined number of times when determining the usage ratio of each motor.