WO2018168656A1 - Power conversion device - Google Patents
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- WO2018168656A1 WO2018168656A1 PCT/JP2018/009055 JP2018009055W WO2018168656A1 WO 2018168656 A1 WO2018168656 A1 WO 2018168656A1 JP 2018009055 W JP2018009055 W JP 2018009055W WO 2018168656 A1 WO2018168656 A1 WO 2018168656A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Definitions
- the present invention relates to a power conversion device that controls an electric motor, and more particularly to a power conversion device that detects the presence or absence of connection between the electric motor and the power conversion device.
- Patent Document 1 discloses a technique for detecting an unconnected state without detecting a magnetic pole position when a synchronous motor is started.
- Patent Document 1 is a positioning mode in which a DC current that gradually increases is passed through a predetermined current path by an armature winding of a synchronous motor by a power converter when starting the synchronous motor, and a positioning mode.
- a control method for a permanent magnet synchronous motor that sets a synchronous operation mode in which an alternating current of variable voltage and variable frequency is supplied to the armature winding, and when in the positioning mode, the armature winding of the permanent magnet synchronous motor Since the current value flowing through the line is detected, and the current value is preset and below the threshold value, it is determined that the synchronous motor is not connected to the power converter, and an alarm is generated.
- the connection between the synchronous motor and the power converter is detected by detecting the presence or absence of current flowing through the synchronous motor. It is characterized in that it is possible to detect the.
- the power conversion device includes a power conversion unit having a rectifier and a switching circuit, and a control unit that controls the switching circuit, and the control unit uses the information from the power conversion unit to A current reproduction unit that calculates the current value flowing in each phase of the motor and outputs a three-phase current value, and a speed control that outputs a PWM control command by comparing the speed command input from the outside with the three-phase current value
- a current reproduction unit that calculates the current value flowing in each phase of the motor and outputs a three-phase current value
- a speed control that outputs a PWM control command by comparing the speed command input from the outside with the three-phase current value
- the absolute value of the current value of the current control unit and the PWM control unit that outputs a switching signal to the switching circuit based on a command from the speed control unit, and within a predetermined determination time
- an unconnected determination unit that outputs an error, and the determination time is a time after the increase time has elapsed from when power is supplied to the power
- FIG. 1 shows an overall configuration in which the power conversion device 100 of the present embodiment, the electric motor 6, and the AC power source 1 are connected.
- the power conversion device 100 controls the ON / OFF of the power conversion unit 110 including the rectifier 2, the smoothing capacitor 3, the current detector 5, and the switching circuit 4, and the switching elements (for example, transistors) in the switching circuit to perform the switching operation. It is comprised from the control part 120 to be made.
- the current input from the external AC power supply 1 to the power conversion unit 110 is converted into a DC current by the rectifier 2 and the smoothing capacitor 3 and supplied to the switching circuit 4 as a DC current.
- the switching circuit 4 performs a switching operation, a current flows through the stator winding of the electric motor 6 to generate a rotating magnetic field, whereby the rotor of the electric motor 6 rotates.
- the control unit 120 includes a storage unit 11 that stores an external speed command and the like, a speed control unit 10 that compares the speed command with a current value in the power conversion unit and outputs a PWM control command, and receives and receives a PWM control command and performs switching. Based on the current values detected by the PWM control unit 14, the cutoff unit 12, the unconnected determination unit 13, and the current detector 5 that output a switching signal for performing the switching operation of the circuit, the current value of each phase of the electric motor 6 is determined. A current reproduction unit 15 to be calculated is included. In this embodiment, a shunt resistor provided between the smoothing capacitor 3 and the switching circuit 4 is used as the current detector 5.
- the speed command 8 input from the outside is once stored in the storage unit 11.
- the speed control unit 10 outputs a PWM control command for rotating the electric motor 6 so that the current value obtained from the current reproduction unit 15 approaches the current value corresponding to the speed command 8 stored in the storage unit 11.
- the PWM control command is transmitted to the PWM control unit 14 via the blocking unit 12.
- the PWM control unit 14 outputs a switching signal for turning on / off each switching element in the switching circuit 4 based on the PWM control command, thereby converting the current flowing through the power conversion unit 110 into a desired magnitude and frequency. To do.
- the current reproduction unit 15 transmits the calculated current value to the speed control unit 10 and also to the unconnected determination unit 13.
- the unconnected determination unit 13 receives a current value from the current reproduction unit 15 during a predetermined determination time and compares it with the threshold value of each phase stored in the storage unit 11. When there is even one phase whose absolute value of current is lower than the threshold value, it is determined that the phase is disconnected (or short-circuited due to dielectric breakdown inside the motor), and a motor non-connection signal is transmitted to the cutoff unit 12 Then, an error signal is transmitted to a user interface such as an operation panel. The operation panel that has received the error signal displays that the motor is stopped because it is determined that the motor is not connected.
- the blocking unit 12 that has received the motor non-connection signal blocks the signal from the speed control unit 10 to the PMW control unit 14.
- the motor non-connection determination unit 13 determines that each phase is normally connected, and the blocking unit 12, the operation panel, etc. The signal to is not output.
- FIG. 2 shows the relationship between the current value calculated by the current reproduction unit 15 and time.
- Three lines in the figure indicate current values of the U phase, the V phase, and the W phase, respectively, and a threshold is set for each phase. This threshold value is stored in the storage unit 11.
- the magnetic pole positioning operation is first performed. Thereafter, the speed is increased to a constant rotational speed by an acceleration operation, and a rotational speed control based on an external speed command is possible.
- the current value of each phase is raised to the target value, and control is performed to keep the current constant so that the current value becomes stable.
- the rotor follows the rotating magnetic field of the stator and waits for the magnetic pole position to be determined.
- the target value is reached when the increase time 16 has elapsed, but current pulsation occurs in the current value.
- the degree of pulsation varies depending on the load condition, the size of the target value, and the length of the increase time 16, but as time passes, the pulsation attenuates and the current value becomes stable.
- One of the features of the present invention is that the time until the stabilization after the increase time is called the stabilization time 17 and the unconnected determination is performed at this time.
- the current value may fall below the threshold for determination.
- each phase of the electric motor 6 is correctly connected.
- a stabilization time 17 is provided between the increase time and the start of the acceleration operation, and further, an unconnected determination process is performed in the latter half of the stabilization time 17, so that an error occurs regardless of the load status.
- the risk of determination can be further reduced. That is, it is possible to provide a power conversion device with improved determination accuracy.
- the lengths of the increase time 16, the stabilization time 17, the determination standby time 18 until the unconnected determination is started, and the determination time 19 for performing the determination process are set in advance and stored in the storage unit 11 via the operation device 7.
- the number of determinations such as how many times the determination process is performed within the determination time 19, the target value of the current of each phase, and the threshold value are also stored in the storage unit.
- the determination time 19 is set to 1/2 after the stabilization time 17, but it may be set to 2/3, 1/4, or the like.
- the increase time / stable time required varies depending on the device configuration and load application, and varies depending on the signal processing capability of the CPU constituting the circuit. At least the determination time 19 should be the same as or shorter than the stabilization time 17. If the determination time 19 is shorter, the determination start time may be a time later than the start time of the stabilization time 17.
- an increase time and a stabilization time are provided during the positioning operation, and the non-connection determination is performed after the pulsation is attenuated, so that the determination can be performed with high accuracy regardless of the load state.
- FIG. 3 shows a configuration diagram of the power conversion apparatus of the present embodiment.
- the position where the current detector 5 is provided is different from that of the first embodiment. Even if the current detector is provided at the position of the present embodiment, if the current value of the remaining two phases among the three phases is known, the current value of the remaining one phase can be calculated. Current value can be calculated.
- FIG. 4 shows a configuration diagram of the power conversion apparatus of the present embodiment.
- the unconnected determination unit 13 transmits an unconnected flag to the speed control unit 10, and the speed control unit 10 changes the PWM speed command to be transmitted after receiving the flag to 0 and outputs it to the PWM control unit 14. .
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Abstract
The purpose of the present invention is to provide a power conversion device which enables high-accuracy detection of non-connection between the electric power conversion device and an electric motor regardless of a load state. To achieve this, the present invention provides a power conversion device provided with a power conversion unit having a rectifier and a switching circuit and a control unit for controlling the switching circuit, wherein the control unit has a current reproduction unit which calculates values of currents flowing in each phase of an electric motor using information from the power conversion unit and outputs three-phase current values, a speed control unit which compares an externally input speed command with the three-phase current values and outputs a PWM control command, a PWM control unit which outputs a switching signal to the switching circuit on the basis of the command from the speed control unit, and a non-connection determination unit which outputs an error when the absolute values of the current values of the current reproduction unit have fallen below a predetermined threshold value within a predetermined determination time period, the determination time period being defined as a time period after an increase time has passed from when power is input to the power conversion unit and before a positioning operation has ended.
Description
本発明は、電動機を制御する電力変換装置に係り、特に電動機と電力変換装置の接続の有無を検出する電力変換装置に関する。
The present invention relates to a power conversion device that controls an electric motor, and more particularly to a power conversion device that detects the presence or absence of connection between the electric motor and the power conversion device.
近年、産業用機械や家庭用電化製品等の機器に電力変換装置で速度制御を可能とする同期電動機を使用する例が増加している。これらの機器に同期電動機を使用する場合、通常は電力変換装置を接続した状態で同期電動機を機器に搭載される。電力変換装置はＰＷＭ信号を制御することで電動機への三相駆動電流を制御し、電動機の回転速度を制御しているが、電力変換装置と同期電動機の未接続状態で機器に組み込まれた同期電動機は、電源を投入しても三相駆動電流がない状態では回転を開始することができない。このような場合、その原因を究明するために、電力変換装置と同期電動機とを機器から取り外すことにより、これらが未接続の状態にあるか否かの確認もすることができるが、このような確認方法では、非常な手間と時間が掛かる作業が強いられることになる。そこで、このような未接続を検出する技術が提案されている。
In recent years, there are increasing examples of using synchronous motors capable of speed control with a power converter for devices such as industrial machines and household appliances. When using a synchronous motor for these devices, the synchronous motor is normally mounted on the device with the power converter connected. The power converter controls the three-phase drive current to the motor by controlling the PWM signal, and controls the rotation speed of the motor, but the power converter and the synchronous motor incorporated in the device in a disconnected state The electric motor cannot start rotating when there is no three-phase drive current even when the power is turned on. In such a case, in order to investigate the cause, it is possible to confirm whether these are in an unconnected state by removing the power converter and the synchronous motor from the device. In the confirmation method, it takes a lot of work and time. Therefore, techniques for detecting such unconnection have been proposed.
特許文献１には、同期電動機の起動時に、磁極位置検出をすることなく未接続を検出する技術が開示されている。
Patent Document 1 discloses a technique for detecting an unconnected state without detecting a magnetic pole position when a synchronous motor is started.
特許文献１に記載の技術は、同期電動機の起動時、電力変換装置により、同期電動機の電機子巻線による所定の通流経路に徐々に増加する直流電流を流す位置決めモードと、位置決めモードに続いて、可変電圧，可変周波数の交流電流を電機子巻線に供給する同期運転モードとを設定する永久磁石同期電動機の制御方法であって、位置決めモードにあるとき、永久磁石同期電動機の電機子巻線に流れる電流値を検出し、電流値が予め設定されて閾値以下のとき、同期電動機が電力変換装置と未接続であると判定し、警報を発生することを特徴とするものであるため、同期電動機の起動開始とともに、同期電動機と電力変換装置との未接続を、同期電動機に流れる電流の有無を検出することにより、検出するものであるため、この未接続を迅速に検出することができることを特徴とするものである。
The technology described in Patent Document 1 is a positioning mode in which a DC current that gradually increases is passed through a predetermined current path by an armature winding of a synchronous motor by a power converter when starting the synchronous motor, and a positioning mode. A control method for a permanent magnet synchronous motor that sets a synchronous operation mode in which an alternating current of variable voltage and variable frequency is supplied to the armature winding, and when in the positioning mode, the armature winding of the permanent magnet synchronous motor Since the current value flowing through the line is detected, and the current value is preset and below the threshold value, it is determined that the synchronous motor is not connected to the power converter, and an alarm is generated. As the synchronous motor is started, the connection between the synchronous motor and the power converter is detected by detecting the presence or absence of current flowing through the synchronous motor. It is characterized in that it is possible to detect the.
しかし、負荷の状態や必要な加速時間によってはさらに精度よく未接続を検出する技術が望まれる。
However, depending on the state of the load and the required acceleration time, a technique for detecting disconnection with higher accuracy is desired.
上記課題を解決するために、例えば特許請求の範囲に記載の発明を適用する。一例をあげるならば、電力変換装置であって、整流器およびスイッチング回路を有する電力変換部と、スイッチング回路を制御する制御部と、を備え、制御部は、電力変換部からの情報を用いて電動機の各相に流れる電流値を演算し、三相電流値を出力する電流再現部と、外部から入力される速度指令と前記三相電流値とを比較して、ＰＷＭ制御指令を出力する速度制御部と、速度制御部からの指令に基づいて前記スイッチング回路にスイッチング信号を出力するＰＷＭ制御部と、電流再現部の電流値の絶対値が、所定の判定時間内に所定の閾値を下回った場合に、エラーを出力する未接続判定部とを有し、判定時間は、前記電力変換部に電力が投入されてから位置決め動作が終了するまでのうち、増加時間が経過した後の時間であるものとする。
In order to solve the above problems, for example, the invention described in the claims is applied. As an example, the power conversion device includes a power conversion unit having a rectifier and a switching circuit, and a control unit that controls the switching circuit, and the control unit uses the information from the power conversion unit to A current reproduction unit that calculates the current value flowing in each phase of the motor and outputs a three-phase current value, and a speed control that outputs a PWM control command by comparing the speed command input from the outside with the three-phase current value The absolute value of the current value of the current control unit and the PWM control unit that outputs a switching signal to the switching circuit based on a command from the speed control unit, and within a predetermined determination time And an unconnected determination unit that outputs an error, and the determination time is a time after the increase time has elapsed from when power is supplied to the power conversion unit until the positioning operation is completed. When That.
本発明によれば、高精度に同期電動機と電力変換装置の未接続を検出できる電力変換装置を提供することができる。
According to the present invention, it is possible to provide a power converter that can detect the disconnection between the synchronous motor and the power converter with high accuracy.
本発明の他の課題・構成・効果は以下の記載から明らかになるであろう。
Other problems, configurations, and effects of the present invention will become clear from the following description.
以下、本発明を適用した実施例１について図１から図２を用いて説明する。
Hereinafter, a first embodiment to which the present invention is applied will be described with reference to FIGS.
図１に、本実施例の電力変換装置１００と電動機６、交流電源１とを接続した全体構成を示す。
FIG. 1 shows an overall configuration in which the power conversion device 100 of the present embodiment, the electric motor 6, and the AC power source 1 are connected.
電力変換装置１００は、整流器２、平滑コンデンサ３、電流検出器５およびスイッチング回路４を備える電力変換部１１０と、スイッチング回路内のスイッチング素子（例えばトランジスタ等）のＯＮ／ＯＦＦを制御しスイッチング動作をさせる制御部１２０とから構成される。
The power conversion device 100 controls the ON / OFF of the power conversion unit 110 including the rectifier 2, the smoothing capacitor 3, the current detector 5, and the switching circuit 4, and the switching elements (for example, transistors) in the switching circuit to perform the switching operation. It is comprised from the control part 120 to be made.
外部の交流電源１から電力変換部１１０に入力される電流は、整流器２と平滑コンデンサ３により直流電流に変換され、スイッチング回路４に直流電流として供給される。スイッチング回路４がスイッチング動作をすることで、電動機６の固定子巻線に電流が流れて回転磁界を発生させることにより、電動機６の回転子が回転する。
The current input from the external AC power supply 1 to the power conversion unit 110 is converted into a DC current by the rectifier 2 and the smoothing capacitor 3 and supplied to the switching circuit 4 as a DC current. When the switching circuit 4 performs a switching operation, a current flows through the stator winding of the electric motor 6 to generate a rotating magnetic field, whereby the rotor of the electric motor 6 rotates.
制御部１２０には、外部の速度指令等を格納する記憶部１１、速度指令と電力変換部内の電流値とを比較してＰＷＭ制御指令を出力する速度制御部１０、ＰＷＭ制御指令を受けてスイッチング回路のスイッチング動作を行うためのスイッチング信号を出力するＰＷＭ制御部１４、遮断部１２、未接続判定部１３、電流検出器５で検出された電流値に基づき、電動機６の各相の電流値を算出する電流再現部１５などが含まれる。本実施例では、平滑コンデンサ３とスイッチング回路４との間に設けたシャント抵抗を電流検出器５として用いている。
The control unit 120 includes a storage unit 11 that stores an external speed command and the like, a speed control unit 10 that compares the speed command with a current value in the power conversion unit and outputs a PWM control command, and receives and receives a PWM control command and performs switching. Based on the current values detected by the PWM control unit 14, the cutoff unit 12, the unconnected determination unit 13, and the current detector 5 that output a switching signal for performing the switching operation of the circuit, the current value of each phase of the electric motor 6 is determined. A current reproduction unit 15 to be calculated is included. In this embodiment, a shunt resistor provided between the smoothing capacitor 3 and the switching circuit 4 is used as the current detector 5.
次に、電力変換装置１００の動作について説明する。
Next, the operation of the power conversion apparatus 100 will be described.
外部から入力された速度指令８は一度記憶部１１に格納される。速度制御部１０は記憶部１１に格納された速度指令８に対応する電流値に、電流再現部１５から得られる電流値が近づくように電動機６を回転させるためのＰＷＭ制御指令を出力する。ＰＷＭ制御指令は遮断部１２を介してＰＷＭ制御部１４へ送信される。ＰＷＭ制御部１４は、ＰＷＭ制御指令に基づいてスイッチング回路４内の各スイッチング素子をＯＮ／ＯＦＦするスイッチング信号を出力することで、電力変換部１１０を流れる電流を所望の大きさ、および周波数に変換する。
The speed command 8 input from the outside is once stored in the storage unit 11. The speed control unit 10 outputs a PWM control command for rotating the electric motor 6 so that the current value obtained from the current reproduction unit 15 approaches the current value corresponding to the speed command 8 stored in the storage unit 11. The PWM control command is transmitted to the PWM control unit 14 via the blocking unit 12. The PWM control unit 14 outputs a switching signal for turning on / off each switching element in the switching circuit 4 based on the PWM control command, thereby converting the current flowing through the power conversion unit 110 into a desired magnitude and frequency. To do.
電流再現部１５は算出した電流値を速度制御部１０へ送信するとともに未接続判定部１３にも送信する。
The current reproduction unit 15 transmits the calculated current value to the speed control unit 10 and also to the unconnected determination unit 13.
未接続判定部１３は、あらかじめ設定された判定時間の間に、電流再現部１５から電流値を受け取り、記憶部１１に記憶された各相の閾値と比較する。閾値よりも電流の絶対値が低い相が一相でもある場合には、その相が断線（あるいはモータ内部の絶縁破壊による短絡）していると判断し、遮断部１２へモータ未接続信号を送信し、操作パネル等のユーザーインターフェースにエラー信号を送信する。エラー信号を受けた操作パネルは、モータ未接続と判断されたためモータの運転を停止する旨を表示する。
The unconnected determination unit 13 receives a current value from the current reproduction unit 15 during a predetermined determination time and compares it with the threshold value of each phase stored in the storage unit 11. When there is even one phase whose absolute value of current is lower than the threshold value, it is determined that the phase is disconnected (or short-circuited due to dielectric breakdown inside the motor), and a motor non-connection signal is transmitted to the cutoff unit 12 Then, an error signal is transmitted to a user interface such as an operation panel. The operation panel that has received the error signal displays that the motor is stopped because it is determined that the motor is not connected.
モータ未接続信号を受信した遮断部１２は速度制御部１０からＰＭＷ制御部１４への信号を遮断する。
The blocking unit 12 that has received the motor non-connection signal blocks the signal from the speed control unit 10 to the PMW control unit 14.
なお、各相の電流値の絶対値がいずれも閾値を超えていた場合には、モータ未接続判定部１３は、各相とも正常に接続されていると判定し、遮断部１２や操作パネル等への信号は出力しない。
In addition, when the absolute value of the current value of each phase exceeds the threshold value, the motor non-connection determination unit 13 determines that each phase is normally connected, and the blocking unit 12, the operation panel, etc. The signal to is not output.
次に判定時間について、図２を用いて説明する。
Next, the determination time will be described with reference to FIG.
図２に、電流再現部１５が算出した電流値と時間との関係を示す。図中の３本の線はそれぞれＵ相、Ｖ相およびＷ相の電流値を示し、それぞれの相ごとに閾値が設定されている。この閾値は記憶部１１に格納されている。
FIG. 2 shows the relationship between the current value calculated by the current reproduction unit 15 and time. Three lines in the figure indicate current values of the U phase, the V phase, and the W phase, respectively, and a threshold is set for each phase. This threshold value is stored in the storage unit 11.
電動機６の運転を開始する際は、まず磁極の位置決め動作を行う。その後加速動作で一定の回転速度まで上げ、外部の速度指令に基づいた回転速度制御が可能な状態となる。
When starting the operation of the electric motor 6, the magnetic pole positioning operation is first performed. Thereafter, the speed is increased to a constant rotational speed by an acceleration operation, and a rotational speed control based on an external speed command is possible.
位置決め動作では、各相の電流値を目標値まで上げ、電流値が安定するように電流を一定に保つ制御を行う。この間に固定子の回転磁界に回転子が追従し、磁極位置が決まるのを待つ。図２に示すように、増加時間１６経過した段階で目標値には到達しているものの、電流値に電流脈動が発生している。脈動の程度は負荷の状況や目標値の大きさや増加時間１６の長さによっても変わってくるが、時間が経てば脈動は減衰し、電流値は安定する。増加時間後、安定するまでの時間を安定時間１７と呼び、この時間に未接続判定を行う点が、本発明の特徴の一つである。
In the positioning operation, the current value of each phase is raised to the target value, and control is performed to keep the current constant so that the current value becomes stable. During this time, the rotor follows the rotating magnetic field of the stator and waits for the magnetic pole position to be determined. As shown in FIG. 2, the target value is reached when the increase time 16 has elapsed, but current pulsation occurs in the current value. The degree of pulsation varies depending on the load condition, the size of the target value, and the length of the increase time 16, but as time passes, the pulsation attenuates and the current value becomes stable. One of the features of the present invention is that the time until the stabilization after the increase time is called the stabilization time 17 and the unconnected determination is performed at this time.
また、安定時間１７の前半で発生する電流値の乱れの程度によっては、電流値が判定のための閾値を下回ってしまう場合があり、そのような場合には電動機６の各相が正しく接続され欠相していないにもかかわらず、未接続と判定されてしまう虞がある。このような電流脈動が激しい場合でも、増加時間と加速動作開始との間に安定時間１７を設け、さらに安定時間１７の後半に未接続の判定処理を行うことで、負荷の状況にかかわらず誤判定の虞をさらに低減することができる。即ち、判定精度を向上させた電力変換装置を提供することが可能となる。
Further, depending on the degree of disturbance of the current value that occurs in the first half of the stabilization time 17, the current value may fall below the threshold for determination. In such a case, each phase of the electric motor 6 is correctly connected. There is a possibility that it is determined that the connection is not established even though the phase is not lost. Even when such current pulsation is severe, a stabilization time 17 is provided between the increase time and the start of the acceleration operation, and further, an unconnected determination process is performed in the latter half of the stabilization time 17, so that an error occurs regardless of the load status. The risk of determination can be further reduced. That is, it is possible to provide a power conversion device with improved determination accuracy.
増加時間１６、安定時間１７、未接続判定を開始するまでの判定待機時間１８、判定処理を行う判定時間１９のそれぞれの長さはあらかじめ設定され、操作器７を介して記憶部１１に格納される。その他、判定時間１９内に何回判定処理を行うかといった判定回数や各相の電流の目標値、閾値も同様に記憶部に格納される。
The lengths of the increase time 16, the stabilization time 17, the determination standby time 18 until the unconnected determination is started, and the determination time 19 for performing the determination process are set in advance and stored in the storage unit 11 via the operation device 7. The In addition, the number of determinations such as how many times the determination process is performed within the determination time 19, the target value of the current of each phase, and the threshold value are also stored in the storage unit.
本実施例では、判定時間１９を安定時間１７の後ろ１／２としているが、２／３や１／４等としても構わない。装置構成や負荷の用途によって求められる増加時間・安定時間も異なり、回路を構成するＣＰＵの信号処理能力によっても変わってくる。少なくとも、判定時間１９は安定時間１７と同じあるいは安定時間よりも短ければよい。判定時間１９の方が短い場合には、判定開始時刻が、安定時間１７の開始時刻より遅い時刻であればよい。
In this embodiment, the determination time 19 is set to 1/2 after the stabilization time 17, but it may be set to 2/3, 1/4, or the like. The increase time / stable time required varies depending on the device configuration and load application, and varies depending on the signal processing capability of the CPU constituting the circuit. At least the determination time 19 should be the same as or shorter than the stabilization time 17. If the determination time 19 is shorter, the determination start time may be a time later than the start time of the stabilization time 17.
本実施例によれば、位置決め動作中に増加時間と安定時間とを設け、脈動が減衰した後に未接続判定を行うことで、負荷の状況に関わらず高精度に判定を行うことが可能となる。
According to the present embodiment, an increase time and a stabilization time are provided during the positioning operation, and the non-connection determination is performed after the pulsation is attenuated, so that the determination can be performed with high accuracy regardless of the load state. .
本実施例では、電流検出器５として、スイッチング回路４と電動機６とを繋ぐ三相の線のうち二相に取り付けられたホールセンサ（あるいは電流センサ）を用いた例を示す。
In the present embodiment, an example is shown in which a Hall sensor (or current sensor) attached to two phases of three-phase lines connecting the switching circuit 4 and the electric motor 6 is used as the current detector 5.
図３に本実施例の電力変換装置の構成図を示す。実施例１とは電流検出器５を設ける位置が異なっている。本実施例の位置に電流検出器を設けても、三相のうち二相の電流値が分かれば残り一相の電流値を計算できるため、実施例１と同様に電流再現部１５が三相の電流値を算出可能である。
FIG. 3 shows a configuration diagram of the power conversion apparatus of the present embodiment. The position where the current detector 5 is provided is different from that of the first embodiment. Even if the current detector is provided at the position of the present embodiment, if the current value of the remaining two phases among the three phases is known, the current value of the remaining one phase can be calculated. Current value can be calculated.
その他の構成および動作については実施例１と同様であるため説明を省略する。
Other configurations and operations are the same as those in the first embodiment, and thus description thereof is omitted.
本実施例では、遮断器の機能を速度制御部に持たせた場合の構成を説明する。
In this embodiment, the configuration when the speed control unit is provided with the function of a circuit breaker will be described.
図４に本実施例の電力変換装置の構成図を示す。本実施例では、未接続判定部１３は、未接続フラグを速度制御部１０へ送信し、速度制御部１０はフラグ受信後に送信するＰＷＭ速度指令を０に変更し、ＰＷＭ制御部１４へ出力する。
FIG. 4 shows a configuration diagram of the power conversion apparatus of the present embodiment. In this embodiment, the unconnected determination unit 13 transmits an unconnected flag to the speed control unit 10, and the speed control unit 10 changes the PWM speed command to be transmitted after receiving the flag to 0 and outputs it to the PWM control unit 14. .
その他の構成および動作については他の実施例と同様であるため説明を省略する。
Other configurations and operations are the same as those in the other embodiments, and thus description thereof is omitted.
１：交流電源、２：整流器、３：平滑コンデンサ、４：スイッチング回路、５：電流検出器、６：電動機、８：速度指令、１０：速度制御部、１１：記憶部、１２：遮断部、１３：未接続判定部、１４：ＰＷＭ制御部、１５：電流再現部、１００：電力変換装置、１１０：電力変換部、１２０：制御部。
1: AC power source, 2: rectifier, 3: smoothing capacitor, 4: switching circuit, 5: current detector, 6: electric motor, 8: speed command, 10: speed control unit, 11: storage unit, 12: shut-off unit, 13: Unconnected determination unit, 14: PWM control unit, 15: Current reproduction unit, 100: Power conversion device, 110: Power conversion unit, 120: Control unit
Claims (2)
- 整流器およびスイッチング回路を有する電力変換部と、前記スイッチング回路を制御する制御部と、を備え、
前記制御部は、
前記電力変換部からの情報を用いて電動機の各相に流れる電流値を演算し、三相電流値を出力する電流再現部と、
外部から入力される速度指令と前記三相電流値とを比較して、ＰＷＭ制御指令を出力する速度制御部と、
前記速度制御部からの指令に基づいて前記スイッチング回路にスイッチング信号を出力するＰＷＭ制御部と、
前記電流再現部の電流値の絶対値が、所定の判定時間内に所定の閾値を下回った場合に、エラーを出力する未接続判定部とを有し、
前記判定時間は、前記電力変換部に電力が投入されてから位置決め動作が終了するまでのうち、増加時間が経過した後の時間であることを特徴とする電力変換装置。 A power conversion unit having a rectifier and a switching circuit, and a control unit for controlling the switching circuit,
The controller is
A current reproduction unit that calculates a current value flowing in each phase of the electric motor using information from the power conversion unit and outputs a three-phase current value;
A speed control unit that compares a speed command input from the outside with the three-phase current value and outputs a PWM control command;
A PWM controller that outputs a switching signal to the switching circuit based on a command from the speed controller;
An unconnected determination unit that outputs an error when the absolute value of the current value of the current reproduction unit falls below a predetermined threshold value within a predetermined determination time;
The determination time is a time after an increase time has elapsed from when power is supplied to the power conversion unit until the positioning operation is completed. - 請求項１に記載の電力変換装置において、
前記増加時間とは、前記電力変換部に電力が投入されてから電流値が前記速度指令と対応する電流値に達するまでの時間であることを特徴とする電力変換装置。 The power conversion device according to claim 1,
The increase time is a time from when power is supplied to the power conversion unit until a current value reaches a current value corresponding to the speed command.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009136129A (en) * | 2007-11-06 | 2009-06-18 | Panasonic Corp | Inverter apparatus |
| JP2013106424A (en) * | 2011-11-14 | 2013-05-30 | Hitachi Ltd | Motor controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009136129A (en) * | 2007-11-06 | 2009-06-18 | Panasonic Corp | Inverter apparatus |
| JP2013106424A (en) * | 2011-11-14 | 2013-05-30 | Hitachi Ltd | Motor controller |
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