KR101801299B1 - Drive control device for motor using fault diagnosis information - Google Patents

Abstract

The present invention relates to a drive control device for a motor using fault diagnosis information for the fault diagnosis and fault prediction of a motor. More particularly, the present invention relates to a drive control device for a motor using fault diagnosis information for the fault diagnosis and fault prediction of a motor, the device which is embedded or configured in an add-on type in an inverter or starter which is essential for a motor drive control. It is possible to significantly reduce the installation cost of a motor fault diagnosis system and to greatly improve accuracy by implementing fault diagnosis through pattern analysis.

Description

[0001] The present invention relates to a drive control device for an electric motor using fault diagnosis information according to a fault diagnosis of a motor,

The present invention relates to a drive control apparatus for an electric motor using fault diagnosis information according to fault diagnosis of an electric motor, and more particularly, to a drive control apparatus for an electric motor which is built in an inverter or a starter, This system significantly reduces the cost of installation of the system and improves accuracy by implementing fault diagnosis through pattern analysis of vibration, current, and voltage. It is used for fault diagnosis of motor and fault diagnosis information for electric motor And a drive control device.

Electric motors are devices that convert electric energy into kinetic energy and are widely used in modern society.

Electric motors are classified into direct current and alternating current according to the nature of electricity to be used. AC motors are divided into induction motors, synchronous motors and commutator motors according to the motional characteristics developed from the internal structure of the motor.

The motor is mainly broken by mechanical rotation and damage of the parts due to friction.

Inside the motor, there are brushes and commutators that must constantly undergo sliding friction, and rotating shafts and bearings that are subject to constant torsional forces and frictional heat when containing external mechanical components.

Such damage causes the output efficiency of the motor to decrease and the driving noise to increase. If left unattended, the entire motor may be damaged or a short circuit may occur.

As the size of the system increases with the output of the individual motors, the costs incurred to deal with the mechanical failures and the accidents due to them are increased. Therefore, the systems in which the plurality of motors are interlocked predict the failure of the components in the individual motors, So that it can be recognized by the manager.

On the other hand, in a method of predicting and recognizing a failure of a system including a rotating machine such as an electric motor and a generator, a vibration sensor is mounted on a body to be inspected and a failure is judged from an abnormal value of the vibration signal.

That is, as shown in FIG. 1, in the "bearing system of diagnosis" of Korean Registered Patent No. 10-1429952, the detection sensor 20 adjacent to the diagnosis object 11 continuously detects the vibration. Sensors, vibration acceleration pickups, and ultrasonic sensors.

In the motor main body, data on the rotational speed is transmitted to the monitoring / diagnosis device 30 using the rotation system 21. [

The monitoring diagnostic apparatus comprises circuits for processing the vibration signal and sending it to the diagnosis unit (34, microcomputer), and a diagnosis unit for judging the abnormality from the rotation number and the vibration signal.

However, since the above method determines an abnormality within a limited range, it is difficult to determine various types of faults that may occur in the motor, and it must be used in connection with a terminal that provides a complicated algorithm Since the initial installation cost is increased and it is determined from the number of revolutions and the vibration signal, it is impossible to control the real-time motor due to the time from the judgment result to the derivation result. If serious motor operation abnormality occurs, It was impossible to cause a major accident and there were limitations in introducing various variables.

In order to solve this problem, in the present invention, it is possible to greatly reduce the installation cost of the motor fault diagnosis system by constructing an inverter or starter built in or built in the inverter, which is essential for the motor drive control, We have proposed a technique that can greatly improve the accuracy by implementing the pattern analysis.

(Prior Art) Korea Patent No. 10-1429952

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is a first object of the present invention to provide a motor fault diagnosis system which is built in an inverter or a starter, We intend to significantly reduce installation costs.

The second object of the present invention is to improve the accuracy by performing the fault diagnosis by combining mechanical and electrical methods for diagnosing faults of the motor and the connected system, and implementing the fault diagnosis through pattern analysis of vibration and power according to various types of faults And to provide promptness to derive judgment results in real time.

According to an aspect of the present invention, there is provided a drive control apparatus for an electric motor using fault diagnosis information for fault diagnosis and fault prediction of an electric motor,

A vibration sensor 230 installed on at least one of the electric motor 210 or the rotary body 220 connected to the electric motor or the rotary shaft for sensing the vibration;

A voltage / current measuring unit 124 connected to the electric power supply line 150 connected to the electric motor 210 to measure a voltage and a current supplied to the electric motor 210,

Acquires a vibration signal from a signal line 240 connected to the vibration sensor 230 and obtains a voltage and a current signal from the voltage / current measuring device 124, and amplifies, filters, and detects the obtained vibration signal, A data modulator 120 for transferring data to the fault diagnosis unit 110,

A fault diagnosis unit 110 for diagnosing a fault by using a vibration signal, a voltage and a current signal provided from the data modulator 120, generating fault diagnosis information according to a diagnosis result and providing the fault diagnosis information to the inverter controller 130,

The fault diagnosis unit 110 obtains the fault diagnosis information from the fault diagnosis unit 110 and provides the fault diagnosis information to the system controller 300. The PWM control signal according to the fault diagnosis information obtained from the fault diagnosis unit 110 and the motor operation command signal transmitted from the system controller An inverter controller 130 for generating and providing a PWM control signal to the switching unit 140,

An inverter (100) including a switching unit (140) for controlling the operation of the electric motor in accordance with a PWM control signal provided from the inverter controller (130);

And a system controller 300 for generating an electric motor operation command signal corresponding to the failure diagnostic information and transmitting the generated electric motor operation command signal to the inverter when the failure diagnosis information provided by the inverter 100 is received.

In the drive control device for an electric motor using the fault diagnosis information according to the present invention having the above-described configuration and operation according to the present invention, the inverter or starter, which is indispensable for the drive control of the motor, The cost for installation of the fault diagnosis system is significantly reduced.

In addition, the fault diagnosis can be realized by analyzing the pattern of vibration and current and voltage according to various types of faults, so that the accuracy can be greatly improved and the quickness of the judgment result can be obtained in real time.

That is, the apparatus of the present invention is built in an inverter or a starter to recognize a failure of an individual motor at an early stage, and when a dangerous situation according to a failure type persists, a first aid action is performed by itself to prevent a system from suddenly stopping The effect can be achieved.

In addition, by combining the mechanical and electrical methods for diagnosing faults in the motor and the connected system, not only the accuracy of the fault diagnosis can be improved, but also the cause of the vibration analysis and the analysis of the current and voltage pattern can be clearly distinguished .

It is also possible to compare the vibration pattern information provided from the data modulator 120 with the normal vibration pattern information stored in the pattern information DB 112 and compare the power pattern information provided from the data modulator 120 and the normal power pattern stored in the pattern information DB 112 And determines that the vibration pattern difference and the power pattern difference are normal when there is no pattern difference and determines that the vibration pattern difference or the power pattern difference exceeds the tolerance range It is judged that it is a failure,

If the difference between the vibration pattern difference and the power pattern difference is within the allowable error range as a result of the determination, the speed deceleration or speed increase signal is provided to the motor, and the vibration signal and the voltage and current signal at the decelerated or increased speed are stored in the data Generates vibration pattern information and power pattern information using the vibration signal and the voltage and current signals provided from the modulator 120 at the provided deceleration or accelerated speed and outputs the generated vibration pattern information and power pattern information as a pattern The difference between the normal vibration pattern information and normal power pattern information of the corresponding velocity stored in the information DB 112 is determined to determine the difference between the vibration pattern and the power pattern, If the difference is within the allowable error range, it is determined to be normal. If it is determined that at least one of the vibration pattern difference and the power pattern difference If the difference that at least exceeds the tolerance range, there is the effect of removing the economic loss resulting from the failure determination section determines that by providing a fault, interrupt the power to accurately determine whether the fault across the secondary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary view showing a conventional fault diagnosis apparatus for a rotating body. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric motor drive control apparatus and an electric motor drive control apparatus.
3 is a detailed block diagram of a drive control apparatus for an electric motor using fault diagnosis information according to an embodiment of the present invention.
FIG. 4 and FIG. 5 are flowcharts illustrating a fault determination procedure of a fault determination unit of an electric motor drive control apparatus using fault diagnosis information according to an embodiment of the present invention. FIG.

The following merely illustrates the principles of the invention. Therefore, those skilled in the art will be able to devise various apparatuses which, although not explicitly described or illustrated herein, embody the principles of the invention and are included in the concept and scope of the invention.

Furthermore, all of the conditional terms and embodiments listed herein are, in principle, only intended for the purpose of enabling understanding of the concepts of the present invention, and are not to be construed as limited to such specifically recited embodiments and conditions do.

Means for solving the problems of the present invention are as follows.

In other words, the drive control apparatus for an electric motor using fault diagnosis information according to the fault diagnosis of the electric motor of the present invention,

A vibration sensor 230 installed on at least one of the electric motor 210 or the rotary body 220 connected to the electric motor or the rotary shaft for sensing the vibration;

A voltage / current measuring unit 124 connected to the electric power supply line 150 connected to the electric motor 210 to measure a voltage and a current supplied to the electric motor 210,

Acquires a vibration signal from a signal line 240 connected to the vibration sensor 230 and obtains a voltage and a current signal from the voltage / current measuring device 124, and amplifies, filters, and detects the obtained vibration signal, A data modulator 120 for transferring data to the fault diagnosis unit 110,

A fault diagnosis unit 110 for diagnosing a fault by using a vibration signal, a voltage and a current signal provided from the data modulator 120, generating fault diagnosis information according to a diagnosis result and providing the fault diagnosis information to the inverter controller 130,

The fault diagnosis unit 110 obtains the fault diagnosis information from the fault diagnosis unit 110 and provides the fault diagnosis information to the system controller 300. The PWM control signal according to the fault diagnosis information obtained from the fault diagnosis unit 110 and the motor operation command signal transmitted from the system controller An inverter controller 130 for generating and providing a PWM control signal to the switching unit 140,

An inverter (100) including a switching unit (140) for controlling the operation of the electric motor in accordance with a PWM control signal provided from the inverter controller (130);

And a system controller 300 for generating an electric motor operation command signal corresponding to the failure diagnostic information and transmitting the generated electric motor operation command signal to the inverter when the failure diagnosis information provided by the inverter 100 is received.

At this time, the fault diagnosis device 110,

Generates vibration pattern information and power pattern information using the vibration signal and the voltage and current signals provided from the data modulator 120 and outputs the generated vibration pattern information and power pattern information to the normal vibration pattern And a normal power pattern information to generate diagnosis result information according to a diagnosis result;

The normal pattern information and the normal power pattern information, which are the signal pattern information, are stored for each rotation speed of the motor, the tolerance range information of the vibration pattern and the tolerance range information of the power pattern are stored in the data modulator And a pattern information DB 112 for storing the vibration signal and the voltage and current signal values provided from the pattern information DB 120.

In addition, the failure determination unit 111 according to the first embodiment,

Generates vibration pattern information using the vibration signal provided from the data modulator 120, compares the generated vibration pattern information with normal vibration pattern information stored in the pattern information DB 112, And generates a power pattern information by using the current signal, compares the generated power pattern information with normal power pattern information stored in the pattern information DB 112 to determine a difference between the vibration pattern and the power pattern, It is determined that the difference between the vibration pattern difference and the power pattern difference is within the permissible error range. If it is determined that at least one of the vibration pattern difference and the power pattern difference exceeds the permissible error range, And generates the failure diagnostic information according to the determination.
And the failure diagnostic information is information indicating normal or failure of the electric motor in accordance with the failure determination.

In addition, the failure determination unit 111 according to the second embodiment,

Generates vibration pattern information using the vibration signal provided from the data modulator 120, compares the generated vibration pattern information with normal vibration pattern information stored in the pattern information DB 112, And generates a power pattern information by using the current signal, compares the generated power pattern information with normal power pattern information stored in the pattern information DB 112 to determine a difference between the vibration pattern and the power pattern, It is determined that there is a failure if at least one of the vibration pattern difference and the power pattern difference exceeds the allowable error range,

If the difference between the vibration pattern difference and the power pattern difference is within the allowable error range as a result of the determination, the speed deceleration or speed increase signal is provided to the motor, and the vibration signal and the voltage and current signal at the decelerated or increased speed are stored in the data Generates vibration pattern information and power pattern information using the vibration signal and the voltage and current signals provided from the modulator 120 at the provided deceleration or accelerated speed and outputs the generated vibration pattern information and power pattern information as a pattern The difference between the normal vibration pattern information and normal power pattern information of the corresponding velocity stored in the information DB 112 is determined to determine the difference between the vibration pattern and the power pattern, If the difference is within the allowable error range, it is determined to be normal. If it is determined that at least one of the vibration pattern difference and the power pattern difference If the difference that at least exceeds the tolerance range, and determines that the fault, characterized in that for generating a failure diagnostic information based on the determination.
And the failure diagnostic information is information indicating normal or failure of the electric motor in accordance with the failure determination.

The inverter controller (130)

A communication unit 131 for obtaining fault diagnosis information from the fault diagnosis unit 110 and providing the fault diagnosis information to the system controller 300 and receiving the motor operation command signal transmitted from the system controller 300;

A PWM control signal for generating the PWM control signal according to the motor operation command signal received by the communication unit 131 and the PWM control signal according to the failure diagnosis information acquired from the failure diagnosis unit 110 and providing the PWM control signal to the switch 140 (133): < / RTI >

At this time, the PWM control signal according to the failure diagnostic information is a signal for causing the switching device 140 to block the electric power supplied to the electric motor when the failure diagnosis information is information that is determined as failure,

The PWM control signal that causes the switching unit 140 to cut off the power supplied to the motor is a signal for stopping the operation of the motor before receiving feedback of the motor operation command signal generated by the system controller according to the failure diagnosis information, .

In addition, the drive control apparatus for an electric motor using fault diagnosis information according to the fault diagnosis of the electric motor according to the present invention is applicable to a slow starter.

Hereinafter, an embodiment of a drive control apparatus for an electric motor using fault diagnosis information according to the present invention will be described in detail.

2 is a configuration diagram of a drive control apparatus for an electric motor using fault diagnosis information according to an embodiment of the present invention.

2, the drive control apparatus for an electric motor using fault diagnosis information according to the fault diagnosis of the electric motor of the present invention includes a vibration sensor 230, an inverter 100, and a system controller 300 do.

The feature of the present invention is that the cost of installation of the motor fault diagnosis system is greatly reduced by being built in or built in the inverter or the starter which is essentially constituted for the motor drive control and the fault diagnosis can be performed by various types of vibration, By implementing the pattern analysis of the voltage, the accuracy can be greatly improved.

In the case of FIG. 2, the components of the present invention are formed on the basis of a three-phase induction motor controlled by an inverter.

Specifically, the vibration sensor 230 is mounted on at least one of the electric motor 210 and the rotary body 220 connected to the electric motor, or the rotary shaft, so that vibration is sensed.

2, the inverter 100 includes a voltage / current measuring unit 124, a data modulator 120, a fault diagnosis unit 110, an inverter controller 130, and a switching unit 140, do.

Specifically, the voltage / current meter 124 is connected to a power supply line 150 connected to the motor 210 to measure a voltage and a current to be supplied to the motor, and can be defined as a power signal.

The data modulator 120 acquires a vibration signal from the signal line 240 connected to the vibration sensor 230 and obtains a voltage and a current signal from the voltage / current measuring device 124, The current signal is amplified, filtered, and detected and transmitted to the fault diagnosis unit 110.

As shown in FIG. 3, in order to perform the above-described functions, the data modulator 120 includes:

An amplifier 121 for obtaining a vibration signal from the signal line 240 connected to the vibration sensor 230 and amplifying the vibration signal and the voltage and current signals obtained by obtaining the voltage and current signals from the voltage / Wow:

A filter unit 122 for removing noise, which is another frequency component outside the signal band,

And a detector 123 for detecting a vibration signal and a voltage and current signal that have passed through the filter unit.

Therefore, the vibration signal, the voltage and the current signal are amplified through the amplification unit 121, and the noise, which is a frequency component other than the signal band, is removed through the filter unit 122 to eliminate the measurement error due to the noise.

Thereafter, the vibration signal and the voltage and current signals passing through the filter unit are detected through the detection unit 123, and the final detected signal is transmitted to the failure diagnosis unit.

The fault diagnosis unit 110 diagnoses the fault using the vibration signal, the voltage and the current signal provided from the data modulator 120, generates fault diagnosis information according to the diagnosis result, and provides the fault diagnosis information to the inverter controller 130 .

It is characterized by generating vibration pattern information and power pattern information by using vibration signal, voltage and current signal, and using normalized vibration pattern information and power pattern information (current, voltage) It is judgment.

This is to increase the accuracy of judgment more.

As shown in FIG. 3, the failure diagnosis unit 110 includes a failure determination unit 111 and a pattern information DB 112 to provide the above functions.

Specifically, the failure determination unit 111 generates vibration pattern information and power pattern information using the vibration signal and the voltage and current signals provided from the data modulator 120, and outputs the generated vibration pattern information and power pattern information The normal vibration pattern information stored in the pattern information DB 112 and the normal power pattern information are compared with each other to diagnose the failure and the diagnosis result information according to the diagnosis result is generated.

At this time, the pattern information DB 112 stores the normal vibration pattern information and the normal power pattern information, which are the signal pattern information in the normal operation, by the rotation speed of the motor, and the allowable error range information of the vibration pattern for each motor speed, Error range information, and stores the vibration signal and the voltage and current signal values provided by the data modulator 120.

Therefore, the failure determination unit 111 generates the vibration pattern information and the power pattern information based on the vibration signal and the voltage and current signals provided from the data modulator, and outputs the generated vibration pattern information and the power pattern information to the normal vibration pattern information And normal power pattern information, respectively.

Meanwhile, the failure determination unit 111 can be classified into the first and second embodiments according to the determination type.

The failure determination unit 111, according to the first embodiment,

Generates vibration pattern information using the vibration signal provided from the data modulator 120, compares the generated vibration pattern information with normal vibration pattern information stored in the pattern information DB 112, And generates a power pattern information by using the current signal, compares the generated power pattern information with normal power pattern information stored in the pattern information DB 112 to determine a difference between the vibration pattern and the power pattern, Or if the difference between the vibration pattern and the power pattern is within the allowable error range, it is judged to be normal.

However, if at least one of the vibration pattern difference and the power pattern difference is greater than the tolerance range, it is determined to be a failure, and the failure diagnosis information according to the determination is generated.

For example, to describe vibration pattern information, vibration pattern information and vibration pattern information generated by a vibration signal at the time of normal operation of the motor at 1,000 rpm are obtained, and when the vibration pattern difference is compared with each other, The fault diagnosis information is generated, and the electric power supplied to the electric motor is immediately cut off.

On the other hand, the failure determination unit 111, according to the second embodiment,

Generates vibration pattern information using the vibration signal provided from the data modulator 120, compares the generated vibration pattern information with normal vibration pattern information stored in the pattern information DB 112, And generates a power pattern information by using the current signal, compares the generated power pattern information with normal power pattern information stored in the pattern information DB 112 to determine a difference between the vibration pattern and the power pattern, And if it is determined that at least one of the vibration pattern difference and the power pattern difference exceeds the allowable error range, it is determined that the fault is a fault.

If both the vibration pattern difference and the power pattern difference are within the allowable error range, the motor is provided with a speed deceleration or speed-increasing signal, and then the vibration signal and the voltage and current signals at the decelerated or increased speed Generates vibration pattern information and power pattern information using the vibration signal and the voltage and current signals provided from the data modulator 120 at the corresponding decelerated or increased speed and provides the generated vibration pattern information and the power pattern information Is compared with the normal vibration pattern information of the corresponding velocity stored in the pattern information DB 112 and the normal power pattern information to determine the difference between the vibration pattern and the power pattern.

If it is determined that there is no pattern difference or both the vibration pattern difference and the power pattern difference are within the tolerance range, it is determined that the difference is normal. However, if at least one of the vibration pattern difference and the power pattern difference is within the allowable error range The fault diagnosis information is finally determined to be the fault and the fault diagnosis information corresponding to the fault is generated.

As described above, when both the vibration pattern difference and the power pattern difference are within a tolerance range, the present invention judges again at a decelerated or increased speed for more detailed analysis.

For example, when the difference between the vibration pattern difference and the power pattern difference is within the allowable error range at 1,000 rpm, the speed is reduced to 500 rpm, and the vibration pattern information and the voltage and current signals at the reduced speed of 500 rpm, And compares the generated vibration pattern information and the generated power pattern information with the normal vibration pattern information of 500 rpm corresponding to the corresponding speed stored in the pattern information DB 112 and the normal power pattern information, The pattern difference is judged.

At this time, if it is determined that there is no pattern difference or if the difference between the vibration pattern and the power pattern is within the allowable error range, it is determined to be normal.

However, if at least one of the vibration pattern difference and the power pattern difference is a difference that exceeds the tolerance range even at the decelerated speed, it is finally determined that the fault is the fault, and the fault diagnosis information corresponding to the fault is finally generated.

In other words, since the place where the motor is installed is usually located at the same production site as the factory where many mechanical equipments are constituted, even if it is within the tolerance range, if the electric power is cut off immediately, Therefore, it is necessary to diagnose the second symptom once again to judge whether it is a temporary symptom or not, without immediately blocking the abnormal symptom.

4, the failure determining unit 111 uses the vibration signal and the voltage and current signals at a constant speed provided from the data modulator 120, (S100) comparing the current vibration pattern information and the power pattern information generated by the current vibration pattern information and the power pattern information with the normal vibration pattern information and the normal power pattern information at the corresponding speed stored in the pattern information DB 112, .

If it is determined that there is no pattern difference, or if both the vibration pattern difference and the power pattern difference are within the permissible error range, it is determined as normal. If at least one of the vibration pattern difference and the power pattern difference exceeds the permissible error range, And generates the fault diagnosis information (S210), and provides the fault diagnosis information to the inverter controller 130.

5, the failure determining unit 111 uses the vibration signal and the voltage and current signals at the constant speed provided from the data modulator 120 (S100) comparing the current vibration pattern information and the power pattern information generated by the current vibration pattern information and the power pattern information with the normal vibration pattern information and the normal power pattern information at the corresponding speed stored in the pattern information DB 112, .

If at least one of the vibration pattern difference and the power pattern difference exceeds the permissible error range, it is determined that there is a fault, and the fault diagnosis information is generated (S210), and the inverter controller (130) .

If both the vibration pattern difference and the power pattern difference are within the permissible error range, the inverter controller provides the speed reduction or speed increase signal of the motor to the inverter controller (S300). Then, the vibration signal at the decelerated or accelerated speed and the voltage (S400) the vibration pattern information and the power pattern information generated using the current signal, respectively, with the normal vibration pattern information and the normal power pattern information at the corresponding decelerated or accelerated velocity stored in the pattern information DB 112, And determines the difference between the vibration pattern and the power pattern.

If it is determined that there is no pattern difference or the pattern difference is within the allowable error range, it is determined as normal. If at least one of the vibration pattern difference and the power pattern difference exceeds the tolerance range, To generate fault diagnosis information (S510) and provide it to the inverter controller.

Meanwhile, in the pattern information DB 112, the normal vibration pattern information and the normal power pattern information, which are the signal pattern information at the time of normal operation, are stored for each rotation speed of the motor, and the tolerance range information of the vibration pattern for each motor speed, Range information, and stores the vibration signal and the voltage and current signal values provided by the data modulator 120.

As shown in Fig. 2, the inverter controller 130 includes:

The fault diagnosis information is obtained from the fault diagnosis unit 110 and provided to the system controller 300. The PWM control signal according to the fault diagnosis information obtained from the fault diagnosis unit 110 and the motor operation command signal transmitted from the system controller And provides the PWM control signal to the switching unit 140. FIG.

3, the inverter controller 130 includes a communication unit 131 and a PWM control signal generating unit 133. [

Specifically, the communication unit 131 obtains the fault diagnosis information from the fault diagnosis unit 110, provides the fault diagnosis information to the system controller 300, and receives the motor operation command signal transmitted from the system controller 300.

At this time, the PWM control signal generating unit 133 generates a PWM control signal according to the motor operation command signal received by the communication unit 131 and a PWM control signal according to the failure diagnosis information acquired from the failure diagnosis unit 110, (140).

At this time, the switching unit 140 controls the operation of the motor according to the PWM control signal provided from the inverter controller 130.

Meanwhile, when the system controller 300 is connected to the inverter 100 through the communication unit and receives the fault diagnosis information provided by the inverter 100, the system controller 300 generates an electric motor operation command signal corresponding to the fault diagnosis information and transmits the signal to the inverter .

In case of normal operation, the motor speed command value for operating the motor at the set rotation speed is provided. However, if it is not normal operation, the rotation speed reduction, the speed increase signal or the power cutoff signal may be provided.

According to another embodiment, the PWM control signal according to the fault diagnosis information is a signal for causing the switching unit 140 to block the power supplied to the motor when the fault diagnosis information is determined to be faulty do.

At this time, the PWM control signal for causing the switching unit 140 to block the power supplied to the motor stops the operation of the motor before receiving the motor operation command signal generated by the system controller in response to the failure diagnosis information from the system controller The signal is a signal to be transmitted.

This is because the probability of failure increases according to the installation environment and the skill level of the operator in the installation step, so that the operation stop is performed immediately when it is judged as a failure without control of the system controller.

As described above, the system controller may be configured to determine whether a failure has occurred in real time and to appropriately respond to the failure. If necessary, the system controller may be stored in advance in the pattern information DB 112, It may be configured to determine whether or not a failure has occurred, and to perform an update for each set period.

This means that it can be flexibly configured because there are areas where the actual motor is installed and the communication environment is not available depending on the working environment.

On the other hand, an inverter and a starter are used as a drive control device used with an electric motor.

The inverter is a device for adjusting the rotational speed of the motor by varying the AC voltage and frequency applied to the motor through pulse width modulation (PWM).

In addition, the slow starter uses a switching semiconductor to prevent damage to the motor and the load by preventing a momentary strong voltage from being applied at the beginning of the operation of the motor. It is used as an alternative to an inverter that maintains a constant speed during operation.

Therefore, the drive control device for an electric motor using the fault diagnosis information according to the fault diagnosis of the electric motor of the present invention,

In the case of the starter, the switch is not operated except for the initial operation phase of the motor, so that the circuit configuration is simple and the space can be efficiently utilized.

The drive control devices have a common role in that they are electrically connected directly to the electric motor and are physically located very close to each other although their roles and purposes are different.

Therefore, according to the present invention, a fault diagnosis system is built in a drive control apparatus adjacent to an electric motor to recognize a failure of an individual motor at an early stage, and according to implementation, a first emergency action is carried out to prevent a situation where the system suddenly stops The advantage is that you can do it.

In addition, by combining the mechanical and electrical methods for diagnosing faults in the motor and the connected system, it is possible not only to improve the accuracy of the fault diagnosis, but also to analyze the pattern of the fault, will be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: Inverter
230: Vibration sensor
300: System controller

Claims (6)

A drive control apparatus for an electric motor using fault diagnosis information according to a fault diagnosis of an electric motor,
A vibration sensor 230 installed on at least one of the electric motor 210 or the rotary body 220 connected to the electric motor or the rotary shaft for sensing the vibration;

A voltage / current measuring unit 124 connected to the electric power supply line 150 connected to the electric motor 210 to measure a voltage and a current supplied to the electric motor 210,
Acquires a vibration signal from a signal line 240 connected to the vibration sensor 230 and obtains a voltage and a current signal from the voltage / current measuring device 124, and amplifies, filters, and detects the obtained vibration signal, A data modulator 120 for transferring data to the fault diagnosis unit 110,
A fault diagnosis unit 110 for diagnosing a fault by using a vibration signal, a voltage and a current signal provided from the data modulator 120, generating fault diagnosis information according to a diagnosis result and providing the fault diagnosis information to the inverter controller 130,
The fault diagnosis unit 110 obtains the fault diagnosis information from the fault diagnosis unit 110 and provides the fault diagnosis information to the system controller 300. The PWM control signal according to the fault diagnosis information obtained from the fault diagnosis unit 110 and the motor operation command signal transmitted from the system controller An inverter controller 130 for generating and providing a PWM control signal to the switching unit 140,
An inverter (100) including a switching unit (140) for controlling the operation of the electric motor in accordance with a PWM control signal provided from the inverter controller (130);

And a system controller (300) for generating an electric motor operation command signal corresponding to the failure diagnosis information and transmitting the generated electric motor operation command signal to the inverter when receiving the failure diagnosis information provided by the inverter (100)

The fault diagnosis device (110)
Generates vibration pattern information and power pattern information using the vibration signal and the voltage and current signals provided from the data modulator 120 and outputs the generated vibration pattern information and power pattern information to the normal vibration pattern And a normal power pattern information to generate diagnosis result information according to a diagnosis result;
The normal pattern information and the normal power pattern information, which are the signal pattern information, are stored for each rotation speed of the motor, the tolerance range information of the vibration pattern and the tolerance range information of the power pattern are stored in the data modulator And a pattern information DB (112) for storing the vibration signal and the voltage and current signal values provided from the pattern information DB (120)

The failure determination unit (111)
Generates vibration pattern information using the vibration signal provided from the data modulator 120, compares the generated vibration pattern information with normal vibration pattern information stored in the pattern information DB 112, And generates a power pattern information by using the current signal, compares the generated power pattern information with normal power pattern information stored in the pattern information DB 112 to determine a difference between the vibration pattern and the power pattern, It is determined that there is a failure if at least one of the vibration pattern difference and the power pattern difference exceeds the allowable error range,
If the difference between the vibration pattern difference and the power pattern difference is within the allowable error range as a result of the determination, the speed deceleration or speed increase signal is provided to the motor, and the vibration signal and the voltage and current signal at the decelerated or increased speed are stored in the data Generates vibration pattern information and power pattern information using the vibration signal and the voltage and current signals provided from the modulator 120 at the provided deceleration or accelerated speed and outputs the generated vibration pattern information and power pattern information as a pattern The difference between the normal vibration pattern information and normal power pattern information of the corresponding velocity stored in the information DB 112 is determined to determine the difference between the vibration pattern and the power pattern, If the difference is within the allowable error range, it is determined to be normal. If it is determined that at least one of the vibration pattern difference and the power pattern difference If the difference that at least exceeds the tolerance range, and determines that a fault,
And generates the fault diagnosis information in accordance with the determination. The drive control apparatus for an electric motor using the fault diagnosis information according to the fault diagnosis of the electric motor. delete delete delete The method according to claim 1,
The inverter controller (130)
A communication unit 131 for obtaining fault diagnosis information from the fault diagnosis unit 110 and providing the fault diagnosis information to the system controller 300 and receiving the motor operation command signal transmitted from the system controller 300;
A PWM control signal for generating the PWM control signal according to the motor operation command signal received by the communication unit 131 and the PWM control signal according to the failure diagnosis information acquired from the failure diagnosis unit 110 and providing the PWM control signal to the switch 140 (133) for driving the electric motor using the fault diagnosis information according to the fault diagnosis of the electric motor.
6. The method of claim 5,
The PWM control signal according to the fault diagnosis information is a signal for causing the switching device 140 to block the power supplied to the motor when the fault diagnosis information is determined to be faulty,
The PWM control signal that causes the switching unit 140 to cut off the power supplied to the motor is a signal for stopping the operation of the motor before receiving feedback of the motor operation command signal generated by the system controller according to the failure diagnosis information, Wherein the fault diagnosis information includes at least one of fault diagnosis information for the motor and fault diagnosis information for the motor.

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