KR101078408B1 - Drive system for surface permanent individual winding multi-phase synchronous motor(SPIMSM) - Google Patents

Abstract

The present invention is a drive system of a permanent magnet surface-mounted independent winding multiphase synchronous motor having an independent wiring structure, wherein a power semiconductor having a structure in which three or more even polyphase motors have phases having a phase difference of 180 degrees with each other is present. Surface Permanent Individual winding Multi-phase Synchronous Motor (SPIMSM) with permanent magnet surface of the device, DC power supply for supplying DC power for driving the SPIMSM, and encoder for sensing the rotational speed of the SPIMSM And a controller for outputting a control signal based on a command signal of an external user and a sensor signal according to a rotation speed detected by the encoder, and a gate driver for generating a gate driving signal for driving the SPIMSM with the control signal. And selectively switching the generated gate driving signal to a gate of each power semiconductor device. It is configured to include a switching unit applied by.

SPMSM, SPIMSM, Motor Failure Diagnosis, Error Backpropagation Neural Network Algorithm

Description

Drive system for surface permanent individual winding multi-phase synchronous motor (SPIMSM) for permanent magnet surface-mounted independent winding multiphase synchronous motor with independent wiring structure

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system of a Surface Permanent Individual Winding Multi-phase Synchronous Motor (SPIMSM).

As automation and high precision of the production process is performed to improve productivity, AC / DC motors are used in many industries. Surface Permanent Multi-phase Synchronous Motor (SPMSM) consists of an armature in which the rotor is made of permanent magnets and the stator is wound around the core. The reverse electromotive force is classified into a sine pie surface SPMSM and a square pie surface BLDC (brushless direct current) motor.

Existing management techniques for maintaining and managing such equipment mainly consisted of post-maintenance after repair or replacement after failure or damage. However, as the size of the facility became larger and more functional, predictive maintenance, which predicted failures and repaired them in advance, began to be required. This is because unexpected failures can lead to paralysis of all or part of the process, resulting in fatal accidents and economic losses. In particular, it is very important to diagnose the short circuit failure of the stator. This is because the interlayer short circuit failure of the stator causes the temperature of the motor to increase due to overload, and the windings of one of the motor windings are short-circuited and burned out due to insulation deterioration or weakness. Ripple is so fast that failures to diagnose and respond early can lead to production degradation and enormous economic losses.

For these reasons, the reliability and stability of equipment becomes more important as the scale of equipment becomes larger and more functional over time.

Model-based and knowledge-based techniques that use voltage or current are the main methods of troubleshooting existing devices.

The model-based technique can build a very good diagnostic system if an accurate model of the process involving the device can be obtained. However, field systems typically include non-linearity, perturbation, disturbances, etc., making it difficult to obtain accurate models.

The knowledge-based system is based on a knowledge base that expresses expert knowledge as part or all of production rules, frames, objects, propositional logic, and the like. This knowledge-based technique can be used for data analysis, status diagnosis, and job scheduling based on the knowledge base of technicians and experience. However, this is done by the technician's personal and subjective thinking, which limits the accuracy.

The advantage of such motor fault diagnosis using voltage or current is that it is less expensive than measurement consistency, precision measurement of mechanical and electrical abnormalities, and vibration analysis. In particular, previous studies have used several transformation methods such as Fourier transform and wavelet transform for accurate analysis of measurement data with time series characteristics. However, in case of fault diagnosis using voltage or current, since the measurement data is time series data, it is difficult to diagnose the original signal, and since the original signal is also not ideal, there are problems that several conversion methods must be additionally used for processing.

In addition, the existing equipment management technology mainly consists of post-maintenance repairing or replacing after failure or damage, as described above. Predictive maintenance continues to be demanded, and thus a need arises.

An embodiment of the present invention has been made to solve the above problems, a method for detecting a permanent magnet surface-attached independent winding multi-phase synchronous motor and interlayer short circuit failure, using the sum of the voltage / current of the opposite phase of the motor The purpose of this invention is to provide a drive system for a permanent magnet surface-mounted, self-winding multiphase synchronous motor with an independent connection structure based on a knowledge base of experts with minimal loss of original signals.

Another object according to an embodiment of the present invention is to characterize the phase difference characteristics of the opposite phase counter electromotive waveform present in the surface permanent individual winding multi-phase synchronous motor (SPIMSM) having an even-polyphase. The present invention provides a drive system for a permanent magnet surface-mounted independent winding multiphase synchronous motor having an independent connection structure for detecting a failure of a target motor, SPIMSM.

Still another object according to an embodiment of the present invention is a permanent magnet surface-attached independent winding multiphase having an independent connection structure for diagnosing a short-circuit short circuit fault and a SPIMSM driven by a low current / low capacity independent control circuit made of independent windings. It is to provide a driving system of a synchronous motor.

The characteristic of the drive system of the permanent magnet surface-mounted independent winding multi-phase synchronous motor having an independent connection structure according to the present invention for achieving the above object is a phase in which three or more even polyphase motors have a phase difference of 180 degrees from each other. Surface Permanent Individual winding Multi-phase Synchronous Motor (SPIMSM), and a DC power supply for supplying DC power required to drive the SPIMSM; An encoder for detecting the rotational speed of the SPIMSM, a control unit for outputting a control signal based on a command signal of an external user and a sensor signal according to the rotational speed detected by the encoder, and driving the SPIMSM by inputting the control signal A gate driver for generating a gate driving signal for the power supply; There is composed by including a switch which is selectively switched to the gate of the body element.

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Preferably, the control unit is a dq-axis converter converting the current signal to the dq-axis based on the sensor signal according to the rotational speed output from the encoder and the multi-phase current control variable input using the coordinate transformation, and the dq A PI controller converting the dq-axis voltage signal based on the dq-axis current signal converted by the axis converter, and converting the multi-phase voltage control variable based on the dq-axis voltage signal converted by the PI controller to output to the gate driver. It characterized in that it comprises a multi-phase control converter.

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As described above, the permanent magnet surface-mounted independent winding multiphase synchronous motor and its driving system having the independent wiring structure according to the present invention, and the interlayer short circuit failure diagnosis method using the opposite phase voltage / current have the following effects. .

First, it is possible to detect the failure of equipment early and diagnose the cause of failure by developing the motor diagnosis technology and constructing a systematic database.

Second, it can not only proactively cope with failures but also prevent serious accidents leading to sudden stops.

Third, it is possible to establish a proper conservation plan by grasping the daily motor operation and interpreting the signs of failure.

Fourth, it is possible to prevent and minimize the economic loss and the loss of life due to stoppages and failures and to maximize the economic benefits through the reduction of maintenance costs.

Fifth, it is possible to diagnose the device more accurately and quickly by using the sum of the voltage / current of the opposite phases to minimize the loss of the original signal.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments with reference to the accompanying drawings.

Referring to the accompanying drawings, a preferred embodiment of a drive system of a permanent magnet surface-mounted independent winding multiphase synchronous motor having an independent connection structure according to the present invention will be described. However, the present invention is not limited to the embodiments disclosed below, but can be embodied in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a block diagram illustrating a driving system of a surface permanent individual winding multi-phase synchronous motor (SPIMSM) according to an embodiment of the present invention.

As shown in FIG. 1, the driving system is a surface permanent magnet multi-phase synchronous motor of a permanent magnet surface of a power semiconductor device having a structure in which three or more even multiphase motors have a phase difference of 180 degrees from each other. Winding Multi-phase Synchronous Motor (SPIMSM) 300, DC power supply unit 100 for supplying the DC power required to drive the SPIMSM 300, the encoder 600 for sensing the rotational speed of the SPIMSM 300, A control unit 500 for outputting a control signal based on a command signal of an external user and a sensor signal according to a rotation speed detected by the encoder 600, and a gate for driving the SPIMSM 300 with the control signal as an input. The gate driver 400 generates a driving signal, and the switching unit 200 selectively switches and applies the generated gate driving signal to a gate of each power semiconductor device.

The SPIMSM 300 driving system configured as described above detects the rotational speed of the SPIMSM 300 in the encoder 600 and transmits the sensor signal to the controller 500, and the controller 500 controls the sensor signal and the external user. The control signal is output such that the SPIMSM 300 is rotated at a speed desired by the user based on the command signal w _r .

FIG. 2 is a circuit diagram illustrating the connection structure of the switching unit and the SPIMSM of FIG. 1 in detail. FIG. 2 illustrates an example of a connection structure of an inverter switching element required to control an independent six-phase SPIMSM.

As shown in FIG. 2, the switching unit 200 is configured as an inverter structure of a full-bridge circuit including a plurality of independent switching elements Q1 to Q4. Each switching element Q1 to Q4 is widely used for power semiconductors such as IGBTs, MOSFETs, and FETs. For reference, FIG. 2 is an independent six-phase permanent magnet surface-attached type and is composed of a total of 24 switching elements (6 H-bridges * 4 switching elements for each bridge), but the number of switching elements is changed according to phases. Will change.

In the A-phase, each switching element Q1 to Q4 is controlled in accordance with the driving signals A1 +, A1-, A2 +, and A2- in the H bridge. In the B-phase, each switching element Q1 to Q4 in the H bridge is controlled according to the B1 +, B1-, B2 +, and B2- driving signals. In the C phase, each switching element Q1 to Q4 is controlled in accordance with the C1 +, C1-, C2 +, and C2- driving signals in the H bridge. In the D-phase, each of the switching elements Q1 to Q4 in the H bridge is controlled according to driving signals D1 +, D1-, D2 +, and D2-. In the E-phase, each switching element Q1 to Q4 is controlled in accordance with the driving signals E1 +, E1-, E2 +, and E2- in the H bridge. In the F-phase, each of the switching elements Q1 to Q4 in the H bridge is controlled according to the F1 +, F1-, F2 +, and F2- driving signals.

In this structure, the control of the SPIMSM 300 is performed through a gate driving signal for switching on / off each of the switching elements Q1 to Q4 output from the gate driver 400.

On the other hand, in driving the H bridge which is the switching element structure, a bipolar switching method, which is a switching method of simultaneously switching on / off by pairing with Q1-Q4 and Q2-Q3, and each switch on / off separately It can be divided into unipolar switching method, which is a method of making and switching a reflux section. In FIG. 2, the unipolar switching method is illustrated. In the bipolar switching method, the characteristics in the commutation section are superior to the unipolar switching method, but as the polarity of the voltage varies from the positive electrode to the negative electrode, the unipolar switching method is illustrated. Compared with this, stress due to voltage shock is increased and current ripple is large.

3 is a block diagram showing the structure of the permanent magnet surface-mounted independent winding multi-phase synchronous motor (SPIMSM) of FIG.

As shown in FIG. 3, the SPIMSM 300 includes a rotor 320 made of permanent magnets and a rotor 320 disposed in the rotor 320 in a continuous arrangement of teeth and slots. It is composed of a stator composed of a coil winding structure, and a three-phase or more even number of polyphase motors each have a phase in which phases each having a 180 degree phase difference exist. At this time, the stator 310 refers to all regions except the rotor 320.

에 비례하는 형태로 발생하는데, 개개의 상을 구성하고 있는 코일의 저항값이 높은 3상 전동기는 그 저항 손실 역시 높아 고효율의 운전이 불가능하다.At this time, the outer rotor structure is located outside the rotor, and the rotor is located inside the stator, the inner rotor structure is called. FIG. 3 is a structure of an external rotor. Referring to FIG. 3, the stator 310 includes 36 salient teeth and 36 slots, and 36 salient teeth are arbitrarily A, B, and C. The windings are wound in a concentrated zone in which coils are wound around six salient poles in the order of phases D, E, and F, and each phase is wound in series. At this time, the phases A to F in the stator 310 are manufactured by arranging six phases regularly, the storage components in the A phase R ₁ , the storage components in the B phase R ₂ , the storage components in the C phase R ₃ , D phase The storage component in R ₄ is defined as R ₄ , and the storage component in R ₅ is defined as R ₆ . The resistance of each phase, R ₁ to R _6, went briefly to the schematic shown on the right. Therefore, in the case of such series connection, six resistance components (R1, R2, R3, R4, R5, R6) are formed in series.
However, in the case of the independent three-phase resistance component, the resistance component of the six independent phases is doubled so that the resistance is large, and thus the driving current is limited, thereby making it difficult to drive at high speed. In other words, the loss

It occurs in the form of proportional to the three-phase motor with high resistance value of the coil constituting the individual phase, the resistance loss is also high, high efficiency operation is impossible.

4 is a timing diagram showing input waveforms and counter electromotive force of a BLDC motor and a permanent magnet surface-mounted independent winding polyphase synchronous motor (SPIMSM) used in the present invention.

In general, the permanent magnet surface-type synchronous motor (SPMSM) is composed of a rotor (rotator) 320 is made of a permanent magnet, the stator (310) consists of an armature wound around the core, which occurs as the motor rotates If the back EMF is a sinusoidal pie, SPMSM and spherical pie are divided into BLDC. Figure 4 (a) is a waveform for the BLDC, Figure 4 (b) is a waveform for the SPIMSM. The motor of the present specification is a SPIMSM, in which a counter electromotive force is a sine wave and an input current of a winding wound around a stator is also driven by a sinusoidal current.

5 is a block diagram of a drive system of a permanent magnet surface-mounted independent winding multiphase synchronous motor showing the structure of the controller of FIG. 1 in more detail.

)(

)를 다상 제어변환기(530)를 통해 다상의 제어변수(

)로 출력한다. 그러면, 게이트 구동부(400)는 상 기 제어부(500)내의 다상 제어변환기(530)에서 출력되는 다상의 전압 제어변수(

)를 입력받아 전력반도체 소자를 구동하기 위한 게이트 구동신호를 생성하여 스위칭부(200)의 각 전력 반도체소자의 게이트에 게이트 구동신호를 인가하여 SPIMSM(300)의 구동을 제어하게 된다.As shown in FIG. 5, the control unit 500 may output a multiphase current control variable i _abcdefs inputted using coordinate transformation based on a vector control technique and a sensor signal θ _r according to a rotation speed output from the encoder 600. The input dq-axis voltage is converted using the two controllers of the d-axis controller (PI controller) 511 and the q-axis controller (PI controller) 512 by converting the signal into a dq-axis current signal through the dq-axis converter 520. signal(

) (

) Through the multiphase control converter 530

) Then, the gate driver 400 is a multi-phase voltage control variable (output from the multi-phase control converter 530 in the control unit 500 (

) To generate a gate driving signal for driving the power semiconductor device to apply the gate driving signal to the gate of each power semiconductor device of the switching unit 200 to control the driving of the SPIMSM 300.

As such, the control unit 500 uses a vector control method using coordinate transformation. The vector control technique using coordinate transformation proposed by the present invention is a three-phase Y-connected general permanent magnet attached synchronous motor widely used throughout the existing industrial development. It can be applied to the final control method in the same way as the control method of (PMSM).

The coordinate transformation is essential in the vector control process, except for the case in which the motor 300 is stopped, the electrical model of the AC motor as in the voltage equation of the motor stator 310 shown in Equation 1 below. Is expressed as a time varying differential equation. However, the interpretation of differential equations with time-varying coefficients is not easy, so the electrical model is converted to differential equations with time-invariant coefficients to simplify the analysis and control.

Equation 1 is a stator voltage equation of a permanent magnet surface-mounted independent winding multiphase synchronous motor (SPIMSM), x is a, b, c, d, f, and e _x is the counter electromotive force of each phase. At this time, the magnetic and mutual inductance is defined as the synchronous inductance L.

Permanent magnet surface-mounted independent winding multiphase synchronous motors (SPIMSM) can also be analyzed simply by complex spatial vector equations, as well as three-phase PMSMs, which are widely used throughout the industry. same.

At this time, since the a, c, e phase and the d, f, b phase can be viewed as a three-phase voltage vector having a 180 degree phase difference, the image is defined as in Equation 3 below.

축, 허수축을

축이라고 했을 때

축 정지좌표계와 6상 정지 좌표계를 나타낸 그래프이다.6 shows a real axis in coordinate transformation using a complex space vector.

Axis, imaginary axis

When we say axis

This graph shows the axis stop coordinate system and the 6-phase stop coordinate system.

축 성분은

축과

축의 3차원 공간상에서 서로 직교하는 축이다. 전동기(300)에서 기계적 출력 발생에 기여하는 항은

와

축 성분이고

축 성분은 손실에만 나타난다.

Axis component is

Axis

These axes are orthogonal to each other in the three-dimensional space of the axes. The term contributing to the generation of mechanical output in the motor 300 is

Wow

Is the axis component

Axial components appear only at loss.

Next, 1/3 in Equation 2 is a coefficient that equals the effective value before and after the d-q conversion. Therefore, when Equation 2 is divided into a real part and an imaginary part, the following Equation 4 is obtained.

를 복소수 공간벡터

축과

축 행렬로 표현한다면,

축과

축 성분은 수학식 5와 같이 변환 행렬 T(θ)를 θ가 0일 때의 변환행렬 T(0)를 이용하여 나타낼 수 있다.Like Equation 4, the real part and the imaginary part

Complex space vector

Axis

Expressed in the axis matrix,

Axis

The axis component can be expressed by using the transformation matrix T (0) when θ is 0 as shown in equation (5).

축 회전좌표계 변수로의 변환은 T(θ)를 이용하여 바로 변환할 수 있지만, 벡터 제어 시에는 간편한 변환을 위해서 정지 좌표계의

축 변수로부터 수학식 6과 같이 회전 행렬을 이용하여 변환한다.At this time, the variable of the six-phase coordinate system is rotated at an arbitrary angular velocity ω

The transformation to the axis coordinate system variable can be converted directly using T (θ) .However, in case of vector control,

It converts from the axis variable using a rotation matrix as shown in Equation 6.

축 회전 좌표계 변수로의 변환은 T(θ)를 이용하여 바로 변환할 수 있지만, 벡터 제어 시에는 간편한 변환을 위해서 정지 좌표계의

축 변수로부터 수학식 6과 같이 회전행렬을 이용하여 변환한다. 도 7 은 정지 좌표계와 회전 좌표계를 표현한 그래프로서, 3상과 6상 모두 동일하다.In addition, the variable of the six-phase coordinate system is rotated at an arbitrary angular velocity ω

The conversion to the axis rotation coordinate system variable can be directly converted using T (θ).

Convert from the axis variable using a rotation matrix as shown in equation (6). 7 is a graph representing a stationary coordinate system and a rotational coordinate system, in which all three phases and six phases are the same.

축 회전좌표계에서 6상 정지좌표계의 변환은 위의 과정을 반대로 수행함으로서 얻어질 수 있는데, 다음 수학식 7은

축 회전좌표계를

축 정지좌표계로의 변환을 나타내고, 다음 수학식 8, 수학식 9는

축 정지좌표계를 6상 고정 좌표계로의 변환을 나타내고 있다.therefore

The conversion of the 6-phase stationary coordinate system in the axis rotation coordinate system can be obtained by performing the above process in reverse.

Axis rotation coordinate system

Indicate the conversion to the axis stop coordinate system, the following equation (8), (9)

The conversion of the axis stop coordinate system to a six-phase fixed coordinate system is shown.

Interlayer short circuit failure diagnosis method using the phase voltage / current facing each other in the permanent magnet surface-mounted independent winding multi-phase synchronous motor having an independent connection structure according to the present invention having such a configuration as follows.

FIG. 8 is a state diagram illustrating a method for diagnosing an interlayer short circuit failure of a permanent magnet surface-mounted independent winding multiphase synchronous motor having an independent connection structure according to an exemplary embodiment of the present invention.

As shown in FIG. 8, a signal of a phase voltage / current facing a phase in a steady state is measured by a Hall sensor, and is normal by an error back propagation neural network algorithm of two inputs and one output. After learning the state, compare the result value with the present signal to determine the normal state and fault condition.

9 (a) to 9 (e) are graphs showing a change in back EMF waveforms in which an interlayer short circuit failure occurs in phases (120 degrees and 300 degrees) facing each other in a permanent magnet surface-mounted independent winding multiphase synchronous motor (SPIMSM). to be.

9 (a) is a graph showing a current waveform on 120 degrees, and FIG. 9 (b) is a graph showing a current waveform on 300 degrees, and the voltage / current sum of two opposite phases (120 degrees and 300 degrees) is shown in FIG. As shown in 9 (c), an unbalanced back EMF waveform is measured from the time point A after the occurrence of the interlayer short fault. 9 (d) is a graph showing the voltage / current sum of two phases (120 degrees and 300 degrees) facing each other in one graph, and FIG. 9 (e) is a graph showing an enlarged scale of the unbalanced counter electromotive force waveform. .

When the interlayer short circuit failure of the opposite phase (120 degrees, 300 degrees) occurs, an unbalanced counter electromotive force waveform is generated as shown in the latter part of FIG. 9 (c) or FIG. 9 (e). If the sum of voltage and current in (B) is 0, it is in a normal state. If an unbalanced back EMF waveform is generated, it is determined as a fault state.

Referring to the drawings the process of discriminating between normal and fault conditions in more detail as follows.

An object of the present invention is to determine whether a failure occurs and the cause of the failure as the size of the facility becomes larger and more functional, and is one of the methods for performing predictive maintenance to predict and repair the failure in advance. In the case of fault diagnosis using voltage or current, since the measurement data is time series data, it is difficult to diagnose the original signal, and since the original signal is also not ideal, methods such as conversion are used for processing.

In general, the rotation principle of the motor is to fix the magnet to the shaft so that it can rotate freely. When the N pole is rotated, the S pole of the magnet attached to the shaft is attracted to the rotating N pole and rotates along the N pole. It has a principle of rotation. The coils of each phase are arranged at equal intervals, and when the bar magnet is placed at the center of its axis and turned, the voltage gradually increases as the N pole of the magnet approaches one coil, and the highest voltage is induced in the coil when it comes to the center of the coil. As you move away from this center, the induced voltage becomes smaller.

In this principle, the voltages generated in the coils of the different phases have the same shape, and only the time intervals are different, that is, the motor rotates in phase with phase difference.

, 다상 전동기의 순시 전류를

, 주파수를

, 상의 개수를

,

이라 할 때, 전압의 위상차(E) 및 전류의 위상차(I)는 다음 수학식 10으로 표현된다.Therefore, the voltage of the polyphase motor

Instantaneous current of polyphase motor

Frequency

, The number of tops

,

In this case, the phase difference E of the voltage and the phase difference I of the current are represented by the following equation (10).

When the phase difference between the voltage and the current is formed as shown in Equation 10, it can be seen that the motor having an even number of phases has an opposite phase. Using the above principle, in the ideal case, the sum of voltages / currents facing each other in a motor that does not fail is zero because the phases are symmetrical, whereas the sum of voltages / currents in the opposite phases with the failed phase is unbalanced. .

The data measured through the voltage / current sum of the opposite phases is learned using the error back propagation neural network algorithm with 2 inputs (voltage / current facing each other) and 1 output (with or without steady state). Let's do it.

The error backpropagation algorithm is an algorithm for learning each data and defining the steady state of the opposing phases in the case of an even number of multiphase motors. In FIG. 10, the error backpropagation neural network is shown. The structure of the back propagation neural network algorithm is shown schematically.

The neural network learning using the error backpropagation algorithm consists of three steps.

First, in step 1, a learning input pattern is input to a neural network with reference to Equation 11 to obtain an output.

In this case, v and w are small random values, p is the number of pairs of learning patterns, the initial value of k is 1, and the output is calculated until k becomes p.

Next, in step 2, the difference between the output value and the target value, that is, the error, is obtained by referring to Equation 12 below.

Finally, step 3 changes the connection strength of the output layer and the connection strength of the hidden layer while propagating the error value in the reverse direction with reference to Equation (13).

When all three steps are completed, go back to step 1 and repeat the process to reduce the error.

When the learning is completed because the error is significantly reduced, the learned signal is compared with the current signal and the difference is used to diagnose the failure of the polyphase motor.

The error back propagation neural network algorithm is a modeling technique that finds patterns inherent in data through iterative learning process from collected data. It consists of input layer, hidden layer, and output layer, and connects nodes to each neuron. Set the model by specifying the value and repeat the training to output the result with the minimum of actual value and error. The error back propagation neural network algorithm can use both discrete and continuous variables, has a wide range of application methods, many commercial data mining products, and a wide range of product choices.

On the other hand, the structure of the permanent magnet surface-mounted independent winding multi-phase synchronous motor (SPIMSM) according to the present invention has a three-phase or more multi-phase structure in each phase is independent form.

As the capacity of the system increases, the amount of current input to each phase also increases, but the loss increases in proportion to the square of the current, and the price of the switching element for driving the motor also increases, but by distributing such a high current into multiple phases. The overall output is increased, and the loss is reduced by reducing the amount of current, and complex structures such as circuit parallelism and device parallelism are unnecessary, and in the case of three phases, when the one phase fails, the power angle exceeds 90 degrees. The motor stops running.

However, as in the present invention, in the case of a multiphase motor having three or more phases, even if one phase is lost, a power angle within 90 degrees exists so that the motor can be continuously operated without stopping and reliability can be ensured. In addition, in the case of an independent phase, if an abnormal operation of the motor occurs due to a failure of the switching element, only the switching element of the failed phase can be separated and replaced independently. Finally, if the number of phases is made even, the phases having a phase difference of 180 degrees exist with each other, and thus the location of winding failure of the motor can be easily determined.

Although the technical spirit of the present invention described above has been described in detail in a preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a block diagram showing a driving system of a surface permanent individual winding multi-phase synchronous motor (SPIMSM) according to an embodiment of the present invention.

FIG. 2 is a circuit diagram illustrating in detail the connection structure of the switching unit and the SPIMSM of FIG.

3 is a block diagram showing the structure of the permanent magnet surface-mounted independent winding multi-phase synchronous motor (SPIMSM) of FIG.

4 is a timing diagram showing input waveforms and counter electromotive force of a BLDC motor and a permanent magnet surface-mounted independent winding multiphase synchronous motor (SPIMSM) used in the present invention.

5 is a block diagram of a drive system of a permanent magnet surface-mounted independent winding multiphase synchronous motor showing the structure of the controller of FIG. 1 in more detail.

축, 허수축을

축이라고 했을 때

축 정지좌표계와 6상 정지 좌표계를 나타낸 그래프6 shows a real axis in coordinate transformation using a complex space vector.

Axis, imaginary axis

When we say axis

Graph showing axis stop coordinate system and 6-phase stop coordinate system

7 is a graph representing a stationary coordinate system and a rotational coordinate system.

8 is a state diagram for explaining the method for diagnosing the short circuit breakdown of a permanent magnet surface-mounted independent winding multiphase synchronous motor having an independent wiring structure according to an embodiment of the present invention.

9 (a) to 9 (e) are graphs showing changes in the back EMF waveform in which an interlayer short fault occurs in a phase faced by the SPIMSM.

Fig. 10 schematically shows the structure of the error backpropagation neural network algorithm used in the fault diagnosis of the motor of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

100: DC power supply unit 200: switching unit

300: SPIMSM 310: stator

320: rotor 400: gate driving unit

500: control unit 511, 512: PI controller

520: d-q axis converter 530: multi-phase control converter

600: encoder

Claims (10)

delete delete Surface Permanent Individual Winding Multi-phase Synchronous Motor: Permanent Magnet Surface Attachment of Power Semiconductor Device with Three-Phase or More Even-Phase Multi-Phase Motors )Wow, A DC power supply unit supplying DC power required for driving the SPIMSM; An encoder for detecting the rotational speed of the SPIMSM; A control unit for outputting a control signal based on a command signal of an external user and a sensor signal according to the rotation speed detected by the encoder; A gate driver configured to generate a gate driving signal for driving the SPIMSM with the control signal as an input; And a switching unit for selectively switching and applying the generated gate driving signal to the gates of the respective power semiconductor devices. The method of claim 3, wherein The switching unit is a drive system of a permanent magnet surface mount type independent winding multi-phase synchronous motor having an independent connection structure, characterized in that the inverter structure of a full-bridge circuit consisting of a plurality of independent switching elements. The method of claim 3, wherein The SPIMSM is a rotor (rotor) made of a permanent magnet, It consists of a stator composed of a structure in which coils are wound in a continuous arrangement of teeth and slots, and each phase of the multiphase motor has an independent connection structure, characterized in that it is wound in series. Drive system for independent winding multi-phase synchronous motor with permanent magnet surface. The method of claim 3, wherein the control unit A d-q-axis converter that converts a multi-phase current control variable input using coordinate transformation based on a vector control technique and a d-q-axis current signal based on a sensor signal according to the rotational speed output from the encoder; A PI controller converting the d-q axis voltage signal based on the d-q axis current signal converted by the d-q axis converter; Permanent magnet surface-attached independent winding polyphase with an independent connection structure, characterized in that it comprises a multi-phase control converter for converting the multi-phase voltage control variable on the basis of the dq-axis voltage signal converted by the PI controller to output to the gate driver Drive system of synchronous motor. delete delete delete delete

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