KR101931446B1 - Method and apparatus for distinguishing type of motor and diagnosing demagnetization of motor - Google Patents

Abstract

The present invention relates to a device for distinguishing a motor and diagnosing demagnetization and, specifically, to a device for distinguishing a motor and diagnosing demagnetization, which distinguishes the kind of a motor installed in a turbo refrigerator and diagnoses the demagnetization of the motor in a case that the motor is distinguished as a permanent magnet motor. According to an embodiment of the present invention, the device for distinguishing a motor and diagnosing demagnetization includes: the motor including a stator on which a coil is wound, and a rotor rotating by a magnetic field generated in the coil; an inverter outputting driving current to the coil; a test signal applying unit generating a test PWM signal and applying the generated test PWM signal to the inverter for a predetermined time; and a microcomputer distinguishing the kind of the motor based on output voltage of the inverter after reaching the predetermined time, and applying a driving PWM signal to the inverter in accordance with the determined kind of motor. The microcomputer blocks the driving PWM signal applied to the motor when the motor is distinguished as a permanent magnet motor. Also, the microcomputer diagnoses the demagnetization of the motor based on the output voltage of the inverter when the speed of the rotor reaches the predetermined speed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for diagnosing a motor,

The present invention relates to a motor discrimination method and a potato diagnosing method for discriminating the type of a motor mounted on a turbo chiller and diagnosing whether or not the motor is potatoed when the motor is discriminated as a permanent magnet motor.

A turbo chiller is a type of air conditioner that sucks low-pressure refrigerant and compresses it with high-pressure refrigerant to cool the air. The turbo chiller includes a compressor for compressing a refrigerant. The compressor is provided with an impeller which rotates by a driving force of the motor to compress the refrigerant.

The motors mounted on the turbo chiller are classified into induction motors and permanent magnet motors.

Since the algorithms for driving the induction motor and the permanent magnet motor are different from each other, conventionally, a driving device for driving the induction motor and a driving device for driving the permanent magnet motor have been separately designed and mounted on the turbo refrigerator.

Accordingly, the conventional turbo chiller has a problem in that compatibility with the motor is low, and the motor drive unit must be replaced every time the motor is replaced.

On the other hand, in the case of the permanent magnet motor, a driving force is generated in accordance with the rotation of the permanent magnet provided inside the motor. At this time, the magnetic flux weakens as the temperature rises and the phenomenon is called demagnetization.

When potatoes are generated on the permanent magnets, the performance of the turbo chiller is deteriorated, so that it is necessary for the user to quickly grasp whether or not the permanent magnets are potatoes.

However, since the motor driving apparatus mounted on the conventional turbo chiller can not grasp the potato of the permanent magnet motor, the performance of the turbo chiller due to the potato can not be prevented.

An object of the present invention is to provide a motor discrimination method and a potato diagnosing method capable of identifying a type of a motor mounted on the turbo chiller prior to driving the turbo chiller and an apparatus for performing the same.

It is another object of the present invention to provide a motor discrimination method and a potentiometer diagnosing method capable of diagnosing whether or not a motor mounted in a turbo chiller is a permanent magnet motor.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

The present invention includes a test signal applying unit for generating a test PWM signal and applying the test PWM signal to the inverter, and a microcomputer for determining the type of the motor based on the output voltage of the inverter after the test PWM signal is cut off. The type can be grasped.

Further, the present invention includes a microcomputer for detecting whether or not the motor is powered on, based on the output voltage of the inverter when the speed of the rotor is reduced to a specific speed by intercepting the driving PWM signal applied to the motor, It is possible to diagnose whether or not the motor is potatoed.

It is not necessary to separately design a device for driving each motor by controlling the inverter according to the type of the motor that is mounted on the turbo chiller prior to driving the turbo chiller. Thereby improving the compatibility with the motor of FIG.

Further, in the present invention, when the motor installed in the turbo chiller is a permanent magnet motor, the performance of the turbo chiller due to the potato of the permanent magnet can be prevented by diagnosing whether or not the motor is potatoed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a motor discriminating and potato diagnosing apparatus according to an embodiment of the present invention; FIG.
2 is a view showing an example of the microcomputer shown in FIG. 1;
3 is a view showing another example of the microcomputer shown in Fig. 1. Fig.
4 is a graph showing the line voltage according to the type of the motor.
5 is a flowchart showing a motor discrimination method and a potato diagnosing method according to an embodiment of the present invention.
6 is a flowchart showing a process of determining the type of a motor based on an output voltage of an inverter.
7 is a flowchart showing a process of diagnosing whether or not the motor is powered on based on the speed of the rotor and the output voltage of the inverter.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

The present invention relates to a device for discriminating the type of motor mounted on a turbo chiller and diagnosing whether the motor is potatoed when the motor is discriminated as a permanent magnet motor.

The turbo chiller is a type of air conditioner that sucks low-pressure refrigerant and compresses it with high-pressure refrigerant to cool the air. The turbo chiller includes a compressor for compressing a refrigerant. The compressor is provided with an impeller which rotates by a driving force of the motor to compress the refrigerant.

The motors mounted on the turbo chiller can be largely classified into induction motors and permanent magnet motors.

The induction motor and the device for driving the permanent magnet motor can be designed in the same hardware. However, since the algorithms for driving the respective motors are different from each other, it is necessary to grasp the type of the motor mounted on the turbo chiller before driving the turbo chiller.

On the other hand, in the case of the permanent magnet motor, a driving force is generated in accordance with the rotation of the permanent magnet provided inside the motor. At this time, the magnetic flux weakens as the temperature rises and the phenomenon is called demagnetization.

If potatoes are generated on the permanent magnets, the performance of the turbo chiller is deteriorated. Therefore, the user must promptly determine whether the permanent magnets are potatoes or not.

Accordingly, a motor discriminating and potato diagnosing apparatus, which will be described later, is an apparatus for driving a motor provided in a turbo chiller, and relates to an apparatus for discriminating the type of motor and diagnosing whether or not the motor is potatoed.

Hereinafter, the motor discriminating and potato diagnosing apparatus according to the embodiment of the present invention and the constituent elements thereof will be described in detail with reference to FIG. 1 to FIG.

1 is a block diagram of a motor discriminating and potato diagnosing apparatus according to an embodiment of the present invention. FIG. 2 is a view showing an example of the microcomputer shown in FIG. 1, and FIG. 3 is a diagram showing another example of the microcomputer shown in FIG. 4 is a graph showing the line voltage according to the type of the motor.

Referring to FIG. 1, a motor discriminating and potato diagnosing apparatus 100 according to an embodiment of the present invention may include a motor 110, an inverter 120, a test signal applying unit 130, and a microcomputer 140. have. The discriminating and diagnosing apparatus 100 shown in FIG. 1 is according to an embodiment, and the constituent elements are not limited to the embodiment shown in FIG. 1, and some elements may be added, changed or deleted .

First, the motor 110 and the inverter 120 among the components constituting the motor discrimination and potato diagnosis apparatus 100 will be described in detail.

The motor 110 may include a stator wound with a coil and a rotor rotated by a magnetic field generated in the coil.

In one example, if the motor 110 is an induction motor, the rotor may be coiled. At this time, a magnetic field due to excitation current is formed in the stator, and an induction current due to a magnetic field formed in the stator can occur in the rotor. The induction current forms a magnetic field in the rotor, and the rotor can rotate by the torque between the magnetic field formed in the rotor and the stator, respectively.

In another example, if the motor 110 is a permanent magnet motor, the rotor may be a permanent magnet. At this time, a magnetic field by excitation current is formed in the stator, and the permanent magnet can rotate in synchronization with the magnetic field formed in the stator.

Alternatively, the permanent magnet motor may rotate in synchronism with the magnetic field formed in the stator formed by the rotor and the permanent magnet.

The inverter 120 can output a driving current to the coil. Here, the driving current is a current that forms a magnetic field for rotating the rotor of the motor 110, and may be the aforementioned exciting current.

The inverter 120 operates according to a PWM signal provided by the test signal applying unit 130 or the microcomputer 140 to output a DC voltage V _DC as an AC current. Also, the inverter 120 may operate in accordance with the PWM signal to output the DC voltage V _DC as a pulse-like current.

To this end, the inverter 120 may include a plurality of power switching elements performing a switching operation in accordance with the PWM signal, and the power switching element may be, for example, an IGBT (Insulated Gate Bipolar Transistor).

The power switching device included in the inverter 120 converts the direct current voltage V _DC into a driving current by performing on and off operations in accordance with the PWM signal for each phase U, As shown in FIG.

Next, the test signal applying unit 130 and the microcomputer 140 among the constituent elements of the motor discriminating and potato diagnosing apparatus 100 will be described in detail with reference to FIG. 2 to FIG.

Referring to FIG. 2, the test signal applying unit 130 generates a test PWM signal and applies the generated test PWM signal to the inverter 120 for a predetermined time. The test PWM signal is a signal to be applied to determine the type of the motor 110 before driving the turbo refrigerator, and may be generated according to an arbitrary command value set by the user.

More specifically, the test PWM signal may be generated according to the test current command I ^* and the test frequency command f ^* . In other words, the test signal applying unit 130 generates a test PWM signal in accordance with the test current command I ^* and the test frequency command f ^* preset by the user, and outputs the generated test PWM signal to the inverter 120. [ As shown in FIG.

At this time, the test current command I ^* may be set to be equal to or larger than the current value for outputting the minimum torque capable of rotating the rotor. Further, the test frequency command f ^* may be set in accordance with the target rotational speed of the rotor.

Meanwhile, the inverter 120 may be selectively connected to the test signal applying unit 130. When the inverter 120 is connected to the test signal applying unit 130, the inverter 120 can be controlled in an open loop.

The test signal applying unit 130 may apply the test PWM signal to the inverter 120 for a preset time and may block the test PWM signal after a preset time has elapsed. Accordingly, the inverter 120 can output the driving current to the motor 110 only for a predetermined time.

The microcomputer 140 can determine the type of the motor 110 based on the output voltage of the inverter 120 after a preset time.

The microcomputer 140 can receive the output voltage of the inverter 120 from a voltage sensor (not shown) after a predetermined time passes. The voltage sensor can measure the output voltage of the inverter 120 according to a preset measurement period and can provide the measured output voltage to the microcomputer 140 every measurement period.

The microcomputer 140 can determine the type of the motor 110 driven by the inverter 120 based on the output voltage provided from the voltage sensor.

Referring to FIG. 4, when the motor 110 is an induction motor, when the test PWM signal is interrupted at time t ₁ , the output voltage of each phase is immediately zero, and the line voltage for any two phases is also zero have.

Alternatively, when the motor 110 is a BLDC (Brushless DC) motor, which is a kind of permanent magnet motor, when a test PWM signal is blocked at time t ₁ , a counter electromotive force is generated on each phase, It can be output as an AC waveform of a trapezoidal shape.

In other words, the output voltage of the inverter 120 measured at a time t ₂ after a predetermined time passes is approximated to 0 when the motor 110 is an induction motor, whereas when the motor 110 is a permanent magnet motor, It can have a specific value that changes in a period.

Accordingly, when the output voltage of the inverter 120 has a specific value other than zero after the test PWM signal is cut off, the microcomputer 140 can determine the motor 110 as a permanent magnet motor. The microcomputer 140 can discriminate the motor 110 as an induction motor when the output voltage of the inverter 120 is 0 after the PWM signal is cut off.

The microcomputer 140 can determine the motor 110 as a permanent magnet motor if the output voltage of the inverter 120 measured after the test PWM signal is cut off is equal to or greater than a predetermined value. On the other hand, when the output voltage of the inverter 120 measured after the test PWM signal is cut off is less than a preset value, the microcomputer 140 can discriminate the motor 110 as an induction motor.

Here, a preset value for distinguishing the induction motor and the permanent magnet motor may be set to approximately zero.

On the other hand, there may be a point where the counter electromotive force of the permanent magnet motor (for example, BLDC) passes 0 as an AC waveform after the PWM signal is cut off as described above. Accordingly, even when the motor 110 is a permanent magnet motor, the output voltage of the inverter 120 can be approximated to 0 according to the measurement time point.

In other words, even when the motor 110 is a permanent magnet motor, the microcomputer 140 can determine the motor 110 as an induction motor.

In order to prevent this, the microcomputer 140 can determine the motor 110 as a permanent magnet motor if the output voltage of the inverter 120 is equal to or higher than a predetermined value more than a predetermined number of times. Also, the microcomputer 140 can discriminate the motor 110 as an induction motor when the output voltage of the inverter 120 is less than a predetermined value by a predetermined number of times or more.

The microcomputer 140 can further determine whether the motor 110 is a BLDC or a Permanent Magnet Synchronous Motor (PMSM) according to the waveform of the counter electromotive force when the motor 110 is determined as a permanent magnet motor.

As shown in FIG. 4, the counter electromotive force of the BLDC in which the PWM signal is interrupted may be a trapezoidal AC waveform. On the other hand, although not shown in the drawing, the counter electromotive force of the PMSM can be a sinusoidal file.

Accordingly, if the waveform of the output voltage of the inverter 120 is trapezoidal after the PWM signal is cut off, the microcomputer 140 can determine the motor 110 as BLDC. If the waveform of the output voltage is sinusoidal, 110) can be determined by the PMSM.

More specifically, the microcomputer 140 may determine the corresponding motor 110 as a BLDC when two or more measured values that are temporally continuous among a plurality of measured values provided from the voltage sensor are the same. On the other hand, the microcomputer 140 can determine the corresponding motor 110 as a PMSM if the two measured values that are continuous in time are different from each other.

In general, the measurement period of the voltage sensor may be much shorter than the period of the counter electromotive force. Accordingly, a plurality of measurement values can be generated within half a period of the counter electromotive force.

When the waveform of the counter electromotive force is a trapezoidal shape, the counter electromotive force can have a constant value in the waveform section corresponding to the upper side of the trapezoid. Alternatively, if the waveform of the counter-electromotive force is sinusoidal, then the two temporally adjacent measurements may always be different.

Accordingly, the microcomputer 140 can further determine the permanent magnet motor 110 as BLDC or PMSM depending on whether two or more measured values adjacent in time are the same.

The above-described BLDC and PMSM, which are types of permanent magnet electric motors, are generally known in the art, so a detailed description thereof will be omitted here.

Referring again to FIG. 2, the microcomputer 140 may apply a driving PWM signal to the inverter 120 according to the determined type of the motor 110.

At this time, the connection between the inverter 120 and the test signal applying unit 130 may be cut off. In other words, if the type of the motor 110 is determined by the microcomputer 140, the inverter 120 and the test signal applying unit 130 can be electrically separated.

When the motor 110 is determined as an induction motor, the microcomputer 140 may apply a driving PWM signal to the inverter 120 according to the driving algorithm of the induction motor stored in the memory.

More specifically, the microcomputer 140 may control the pulse width of the driving PWM signal for each phase and provide it to the inverter 120. The inverter 120 may control the magnitude of the driving current according to the pulse width of the driving PWM signal and output it to the induction motor.

The driving currents of the phases U, V and W can be applied to the three-phase coil wound on the stator of the induction motor, and a rotating field due to the driving current can be formed on the stator. An induced current due to the rotating magnetic field of the stator may be generated in the coil wound on the rotor, and thus a magnetic field may be formed in the rotor.

At this time, the induction motor can be driven by the rotation of the rotor by the torque between the magnetic field formed in the rotor and the stator, respectively.

When the motor 110 is determined as a permanent magnet motor, the microcomputer 140 may apply a driving PWM signal to the inverter 120 according to the driving algorithm of the permanent magnet motor stored in the memory.

More specifically, the microcomputer 140 may control the ON and OFF periods of the driving PWM signal for each phase to provide the PWM signal to the inverter 120. [ The inverter 120 can control the power switching element according to the ON and OFF states of the driving PWM signal to generate the driving current.

The generated drive current can be applied to the coil wound on the stator of the permanent magnet motor in a constant direction, thereby generating a magnetic field in a specific direction. At this time, the permanent magnet motor can be driven by rotating the permanent magnet (rotor) in accordance with the magnetic field generated in the stator.

The microcomputer 140 may generate a driving PWM signal through closed loop control. That is, before the turbo refrigerator is driven, the inverter 120 is connected to the test signal applying unit 130 to be open loop controlled. After the type of the motor 110 is determined, the inverter 120 is separated from the test signal applying unit 130, Lt; / RTI >

2, the microcomputer 140 includes a position estimating unit 141, a velocity calculating unit 142, a command value generating unit 143, a PWM signal generating unit 144, and a PWM signal generating unit 144 for controlling the closed loop of the inverter 120. [ And an axis conversion unit 145. [

The configuration of the microcomputer 140 shown in Fig. 2 is according to one example, and the constituent elements thereof are not limited to the example shown in Fig. 2, and some elements may be added, changed or deleted as necessary.

The driving current I _abc and the output voltage V _abc shown in FIGS. 2 and 3 are three-phase currents I _a , I _b and I _c and three-phase voltages V _a , V _b and V _{c c} ) as one parameter. In other words, although the driving current I _abc and the output voltage V _abc are each expressed by one parameter, the driving current I _abc may include the three-phase currents I _a , I _b , and I _c And the output voltage V _abc can include the three-phase voltages V _a , V _b , and V _c .

)를 추정할 수 있다.The position estimating section 141 estimates the position of the rotor based on at least one of the drive current I _abc and the output voltage V _abc of the inverter 120

) Can be estimated.

)를 추정할 수 있다.The position estimating section 141 can receive the driving current I _abc from the current sensor (not shown) and can receive the output voltage V _abc from the voltage sensor. The position estimating section 141 can estimate the position of the rotor based on at least one of the provided drive current I _abc and the output voltage V _abc and calculate the position of the rotor based on the estimated position of the rotor Each location (

) Can be estimated.

)에 기초하여 회전자의 속도(

)를 산출할 수 있다. 보다 구체적으로, 속도 산출부(142)는 회전자의 위치를 시간(예를 들어, 측정 주기)으로 나누어 회전자의 속도(

)를 산출할 수 있다.The velocity calculator 142 calculates the velocity V

) ≪ / RTI >

) Can be calculated. More specifically, the speed calculating section 142 divides the position of the rotor by a time (for example, a measurement cycle)

) Can be calculated.

) 및 목표 속도값(

)에 기초하여 전류 지령치를 생성하고, 생성된 전류 지령치 및 구동 전류에 기초하여 목표 지령치를 생성할 수 있다.The command value generation section 143 generates the command value

) And the target speed value (

), And generate the target command value based on the generated current command value and the drive current.

)은 사용자 또는 외부 디바이스로부터 입력되는 값으로서, 회전자의 회전 속도에 대한 목표값일 수 있다.Here, the target speed value (

Is a value input from a user or an external device and may be a target value for the rotational speed of the rotor.

) 및 목표 속도값(

)에 기초하여 속도 지령치를 산출하고, 산출된 속도 지령치에 기초하여 전류 지령치를 생성할 수 있다.The command value generation section 143 generates the command value

) And the target speed value (

), And the current command value can be generated based on the calculated speed command value.

)에 기초하여 목표 지령치를 생성할 수 있다. 여기서 목표 지령치는 전압 지령치 및 주파수 지령치 중 적어도 하나를 포함할 수 있다.The command value generation section 143 generates the command value and the drive current

The target command value can be generated. Here, the target command value may include at least one of a voltage command value and a frequency command value.

)는 3상 구동 전류(I_a, I_b, I_c)를 축변환하여 생성될 수 있다.The drive current (< RTI ID = 0.0 >

Can be generated by axially transforming the three-phase drive currents I _a , I _b , and I _c .

)로 축변환할 수 있다.More specifically, the axis converting unit 145 can receive the three-phase driving currents I _a , I _b , and I _c from the current sensor and can perform axial conversion into a two-phase current of a stationary coordinate system. Further, the axis converting unit 145 converts the two-phase current of the stationary coordinate system into a two-phase current (

). ≪ / RTI >

)와 기 생성된 전류 지령치에 기초하여 목표 지령치를 생성할 수 있다.The setpoint value generation section 143 generates a setpoint value by multiplying the q-axis, d-axis current (

) And the previously generated current command value.

The PWM signal generation section 144 can generate the drive PWM signal based on the target command value. More specifically, the PWM signal generating section 144 can control the pulse width of the driving PWM signal in accordance with the target instruction value. Further, the PWM signal generating section 144 can control the ON and OFF periods of the driving PWM signal in accordance with the target command value.

)는 목표 속도값(

)을 추종할 수 있다.This closed-loop control allows the speed of the rotor

) Is the target speed value

) Can be followed.

3, the microcomputer 140 includes a command value generation unit 143, a PWM signal generation unit 144, and an axis conversion unit 145 for controlling the closed loop of the inverter 120, Only < / RTI >

Here, the PWM signal generation unit 144 and the axis conversion unit 145 are the same as the respective components shown in FIG. 2, and a detailed description thereof will be omitted here.

)를 측정하는 홀센서(150)를 더 포함할 수 있다.The microcomputer 140 shown in FIG. 3 may not include the position estimator 141 and the velocity calculator 142 shown in FIG. In this case,

And a Hall sensor 150 for measuring the Hall effect.

)를 측정할 수 있다.Hall sensor 150 may include an element whose voltage varies with the intensity of the magnetic field, and may use a period in which the voltage varies to change the speed of the rotor

) Can be measured.

)에 기초하여 인버터(120)에 구동 PWM 신호를 인가할 수 있다.At this time, the microcomputer 140 calculates the driving current I _abc and the speed of the rotor measured by the hall sensor 150

The drive PWM signal can be applied to the inverter 120. [

)를 제공받고, 회전자의 속도(

)와 목표 속도값(

)에 기초하여 속도 지령치를 산출하고, 산출된 속도 지령치에 기초하여 전류 지령치를 생성할 수 있다.More specifically, the command value generating section 143 calculates the speed of the rotor from the hall sensor 150

), And the speed of the rotor (

) And the target speed value (

), And the current command value can be generated based on the calculated speed command value.

Hereinafter, the method of generating the target command value based on the current command value is as described above, and thus a detailed description thereof will be omitted.

As described above, according to the present invention, before the turbo chiller is driven, the type of the motor mounted on the turbo chiller is determined and an inverter 120 is controlled according to the type of the motor to drive each motor It is possible to improve the compatibility with the motor of the turbo chiller because there is no need to design it separately.

When the motor 110 is judged to be a permanent magnet motor, the microcomputer 140 cuts off the driving PWM signal applied to the motor 110 and controls the output voltage of the inverter 120 when the speed of the rotor is a predetermined speed It is possible to diagnose whether or not the motor 110 is powered on.

When the motor 110 is determined to be a permanent magnet motor, the microcomputer 140 can apply a driving PWM signal to the inverter 120 according to a driving algorithm of the permanent magnet motor.

When the permanent magnet motor is being driven, the microcomputer 140 may block the driving PWM signal applied to the motor 110. [ More specifically, the PWM signal generator 144 shown in FIG. 2 may block the driving PWM signal provided to the inverter 120. FIG.

The microcomputer 140 may block the driving PWM signal according to a user input or may block the driving PWM signal at a predetermined time when the microcomputer 140 automatically drives the motor 110. [

In one example, if the user wishes to stop driving the turbo chiller, the user may provide a user input to the microcomputer 140 to shut off the driving PWM signal so that the microcomputer 140 can block the driving PWM signal have.

In another example, when the turbo chiller is driven at a predetermined time interval, the microcomputer 140 may block the driving PWM signal at the time when the driving of the turbo chiller is terminated.

When the drive PWM signal is interrupted, the drive current may not be output to the motor 110, and thus the speed of the rotor may decrease.

The microcomputer 140 can diagnose whether or not the motor 110 is powered on based on the output voltage of the inverter 120 when the speed of the rotor decreases at a predetermined speed.

More specifically, when the driving PWM signal is interrupted, the microcomputer 140 calculates the speed of the rotor and compares the calculated speed of the rotor with a preset speed. Since the method of calculating the speed of the rotor has been described with reference to FIG. 2, a detailed description thereof will be omitted here.

When the driving PWM signal is interrupted, the microcomputer 140 receives the speed of the rotor from the Hall sensor 150 and compares the speed of the provided rotor with a preset speed. The method of measuring the speed of the rotor by the Hall sensor 150 has been described with reference to FIG. 3, so that a detailed description thereof will be omitted here.

The preset speed may be set lower than the speed of the rotor when the turbo chiller is running. In other words, the predetermined speed may be set lower than the speed of the rotor before the drive PWM signal is shut off.

The microcomputer 140 may compare the output voltage of the inverter 120 with a preset range when the speed of the rotor is a preset speed to diagnose whether or not the motor 110 is potatoed.

More specifically, when the speed of the rotor is reduced to a predetermined speed, the microcomputer 140 can receive the output voltage of the inverter 120 from the voltage sensor. The microcomputer 140 can compare the output voltage of the provided inverter 120 with a predetermined range.

A reference voltage corresponding to the speed of the rotor of the permanent magnet motor may be stored in the internal memory of the microcomputer 140 in advance. In other words, the reference voltage may be the output voltage of the inverter 120 according to the speed of the rotor.

The microcomputer 140 can determine the reference voltage corresponding to the preset speed by referring to the internal memory.

범위로 설정될 수 있다. 보다 구체적으로, 미리 설정된 속도가 5000[rpm]일 때, 5000[rpm]에 대응하는 기준 전압은 10[V]일 수 있다. 이 때, 미리 설정된 범위는 9 ~ 11[V]로 설정될 수 있다.On the other hand, the preset range can be set based on the reference voltage. For example, the predetermined range may be a reference voltage

Lt; / RTI > More specifically, when the preset speed is 5000 [rpm], the reference voltage corresponding to 5000 [rpm] may be 10 [V]. At this time, the preset range can be set to 9 to 11 [V].

The microcomputer 140 can diagnose that the potentiometer is not generated in the motor 110 when the output voltage of the inverter 120 is within the predetermined range when the speed of the rotor is a preset speed. Further, the microcomputer 140 can diagnose that the motor 110 has generated a potato when the output voltage of the inverter 120 is out of a preset range when the speed of the rotor is a predetermined speed.

The output voltage of the inverter 120 can be approximated to the reference voltage stored in the internal memory of the microcomputer 140. In this case, On the other hand, when a potentiometer is generated in the motor 110, an error may occur between the output voltage of the inverter 120 and the reference voltage stored in the internal memory of the microcomputer 140.

Generally, when a potato is generated in the motor 110, the output voltage of the inverter 120 can be measured to be lower than the reference voltage. Accordingly, the microcomputer 140 can diagnose that the potentiometer is generated in the motor 110 when the measured output voltage is out of the preset range.

As described above, according to the present invention, if the motor mounted on the turbo chiller is a permanent magnet motor, the performance of the turbo chiller due to the potato of the permanent magnet can be prevented from being deteriorated.

Hereinafter, a motor discrimination method and a potato diagnosing method according to an embodiment of the present invention will be described in detail with reference to FIG. 5 to FIG.

5 to 7 can be performed by a control unit that provides a PWM signal to an inverter that drives a motor. Here, the control unit may include the test signal applying unit 130 and the microcomputer 140 shown in FIG.

Since the test signal applying unit and the microcomputer have been described with reference to FIGS. 1 to 3, a detailed description thereof will be omitted here.

5 is a flowchart illustrating a motor discrimination method and a potato diagnosing method according to an embodiment of the present invention.

5, the control unit can be applied for a preset period of time (t _s) the test PWM signal generates a test signal and to generate a PMW inverter (S510).

In other words, the control unit can then if applied during the test PWM signal time (t _s) is set in advance to the drive, the pre-set time (t _s) dogwa block test PWM signal.

Subsequently, the control unit can determine the type of the motor based on the output voltage of the inverter after interrupting the test PWM signal (S520).

Here, the motor is a motor mounted on the turbo chiller and can be divided into an induction motor or a permanent magnet motor as described above.

If the motor is determined to be an induction motor (S530), the control unit may apply a driving PWM signal to the inverter according to the driving algorithm of the induction motor stored in the internal memory (S540).

If the motor is determined to be a permanent magnet motor (S550), the control unit may apply a driving PWM signal to the inverter according to the driving algorithm of the permanent magnet motor stored in the internal memory (S560).

) 와 비교할 수 있다(S570).When the permanent magnet motor is in operation, the control unit interrupts the drive PWM signal being applied to the motor and sets the speed of the rotor constituting the motor at a predetermined speed (

(S570).

)일 때의 인버터의 출력 전압에 기초하여 모터의 감자 여부를 진단할 수 있다(S580).Then, the control unit determines whether the speed of the rotor exceeds a predetermined speed

(Step S580). The output voltage of the inverter can be used to diagnose whether or not the motor is turned on.

Hereinafter, the process of determining the type of motor will be described in more detail.

6 is a flowchart showing a process of discriminating the type of motor based on the output voltage of the inverter.

Referring to FIG. 6, the control unit may measure the output voltage Vo of the inverter when the preset time t _s is less than or equal to the preset time t _s (S521). To this end, the control unit may further comprise a voltage sensor for measuring the three-phase output voltage Vo of the inverter.

Subsequently, the control unit may compare the measured output voltage (V _O ) with a preset value (V _S ) (S522).

As a result of the comparison, if the output voltage V _O is not equal to the preset value V _S , the control unit can determine the motor as an induction motor (S530). On the other hand, if the output voltage V _O is equal to or greater than the predetermined value V _S , the control unit can determine the motor as a permanent magnet motor (S550).

Hereinafter, the process of diagnosing whether or not the motor is powered on will be described in more detail.

7 is a flowchart showing a process of diagnosing whether or not the motor is potato based on the speed of the rotor and the output voltage of the inverter.

)를 산출하거나 측정할 수 있다(S571).Referring to FIG. 7, after the control unit interrupts the driving PWM signal,

) Or may be measured (S571).

)를 산출하는 방법은 도 2를 참조하여 설명한 방법과 동일하고, 제어 유닛이 회전자의 속도(

)를 측정하는 방법은 도 3을 참조하여 설명한 방법과 동일하므로, 여기서는 자세한 설명을 생략하도록 한다.If the control unit determines the speed of the rotor (

) Is the same as the method described with reference to Fig. 2, and the control unit calculates the speed of the rotor

) Is the same as the method described with reference to FIG. 3, and thus a detailed description thereof will be omitted.

)가 미리 설정된 속도(

)와 동일한지 여부를 판단할 수 있다(S572).The control unit then determines the speed of the rotor

) Is at a preset speed (

(S572). ≪ / RTI >

)가 미리 설정된 속도(

)와 동일하지 않으면, 제어 유닛은 회전자의 속도(

)가 미리 설정된 속도(

)와 동일해질 때까지 회전자의 속도(

)를 산출 또는 측정할 수 있다(S571).The speed of the rotor (

) Is at a preset speed (

), The control unit determines that the speed of the rotor (

) Is at a preset speed (

) Until it becomes equal to the rotor speed

) Can be calculated or measured (S571).

)가 미리 설정된 속도(

)와 동일하면, 제어 유닛은 인버터의 출력 전압(V_O)을 측정할 수 있다(S581).The speed of the rotor (

) Is at a preset speed (

), The control unit can measure the output voltage (V _O ) of the inverter (S581).

Subsequently, the control unit may determine whether the measured output voltage V _O is within a predetermined range (S582).

As a result of the determination, if the output voltage (V _O ) is within the predetermined range, the control unit can diagnose (normal diagnosis) that no potato has occurred in the motor (S583). On the other hand, if the output voltage V _O is out of the preset range, the control unit can diagnose that the motor has generated a potato (S584).

The step S510 shown in FIG. 5 may be the same as the operation method of the test signal applying unit described with reference to FIG. 2 and FIG. Steps S520 to S580 shown in FIG. 5 may be the same as those of the microcomputer described with reference to FIGS. 2 and 3. FIG.

Steps S522, S572, S582, and S584 shown in FIG. 6 may be the same as those of the microcomputer described with reference to FIG. 2 and FIG.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

110: motor 120: inverter
130: Test signal application unit 140: Microcomputer

Claims (13)

A motor including a stator wound with a coil and a rotor rotated by a magnetic field generated in the coil;
An inverter for outputting a driving current to the coil;
Generating a test PWM signal according to a test current command and a test frequency command preset by a user, and generating a test signal for selectively supplying the generated test PWM signal to the inverter for the predetermined time, An authorization section; And
And a microcomputer for determining the type of the motor based on an output voltage output from the inverter and for applying a driving PWM signal to the inverter according to the determined type of the motor,
Wherein the microcomputer is configured to interrupt the drive PWM signal applied to the motor when the motor is determined to be a permanent magnet motor and to control the motor on the basis of an output voltage of the inverter when the speed of the rotor is a preset speed, To diagnose whether
Motor discrimination and potato diagnostics.
The method according to claim 1,
The test signal applying unit
And generates the test PWM signal according to a test current command and a test frequency command.
The method according to claim 1,
The microcomputer
And judges the motor as the permanent magnet motor if the output voltage of the inverter measured after passing the predetermined time exceeds a preset value.
The method according to claim 1,
The microcomputer
And judging the motor as an induction motor when the output voltage of the inverter measured after the predetermined time passes is less than a preset value.
The method according to claim 1,
The microcomputer
A position estimator for estimating an electric angular position of the rotor based on at least one of the drive current and the output voltage of the inverter;
A speed calculating unit for calculating a speed of the rotor based on the estimated electric angular position;
An instruction value generation unit for generating a current instruction value based on the calculated speed and target speed value of the rotor and generating a target instruction value based on the generated current instruction value and the drive current; And
And a PWM signal generator for generating the drive PWM signal based on the target command value.
The method according to claim 1,
The microcomputer
And calculates the speed of the rotor when the drive PWM signal is interrupted, and compares the calculated speed of the rotor with the preset speed.
The method according to claim 1,
Further comprising a hall sensor for measuring the speed of the rotor,
Wherein the microcomputer applies the driving PWM signal to the inverter based on the driving current and the measured speed of the rotor.
8. The method of claim 7,
The microcomputer
Wherein the speed of the rotor is provided from the hall sensor when the driving PWM signal is interrupted, and the speed of the provided rotor is compared with the preset speed.
The method according to claim 1,
The microcomputer
And comparing the output voltage of the inverter with a predetermined range when the speed of the rotor is a preset speed to diagnose whether or not the motor is to be potatoed.
10. The method of claim 9,
The microcomputer
And diagnosing that no potato has occurred in the motor when the output voltage of the inverter is within the predetermined range and diagnosing that the motor has a potato when the output voltage of the inverter is out of the preset range, .
A motor identification and potentiometer diagnostic method of a control unit for providing a test PWM signal or a drive PWM signal to an inverter for driving the motor,
Generating the test PWM signal according to a test current and a test frequency command preset by a user and applying the generated test PWM signal to the inverter for a preset time;
Determining a type of the motor based on an output voltage output from the inverter after the predetermined time has elapsed;
Applying the driving PWM signal to the inverter according to the discriminated motor type;
Interrupting the drive PWM signal applied to the motor when the motor is determined to be a permanent magnet motor and comparing the speed of the rotor constituting the motor with a preset speed; And
And diagnosing whether or not the motor is powered on based on an output voltage of the inverter when the speed of the rotor is the predetermined speed.
12. The method of claim 11,
The step of discriminating the type of the motor based on the output voltage of the inverter when the predetermined time has elapsed
Determining the motor as the induction motor if the measured output voltage is equal to or greater than a preset value and discriminating the motor as the induction motor if the measured output voltage is less than the preset value; Diagnostic method.
12. The method of claim 11,
Wherein the step of diagnosing whether or not the motor is powered on based on an output voltage of the inverter
Diagnosing that the motor does not generate a potentiometer if the measured output voltage is within a predetermined range and diagnosing that a potato has occurred in the motor if the measured output voltage is outside a preset range, Diagnostic method.

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