JP3953358B2 - Control method of permanent magnet motor - Google Patents

Control method of permanent magnet motor Download PDF

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Publication number
JP3953358B2
JP3953358B2 JP2002115622A JP2002115622A JP3953358B2 JP 3953358 B2 JP3953358 B2 JP 3953358B2 JP 2002115622 A JP2002115622 A JP 2002115622A JP 2002115622 A JP2002115622 A JP 2002115622A JP 3953358 B2 JP3953358 B2 JP 3953358B2
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Japan
Prior art keywords
permanent magnet
magnet motor
current
inverter
contactor
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Expired - Lifetime
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JP2002115622A
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Japanese (ja)
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JP2003319688A (en
Inventor
善久 北条
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Toyo Electric Manufacturing Ltd
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Toyo Electric Manufacturing Ltd
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【０００１】
【発明の属する技術分野】
本発明は、永久磁石モータの制御方法に係り、特に永久磁石モータとインバータ間に永久磁石モータをオンオフさせる接触器を設けて該接触器を制御する制御方法に関する。
【０００２】
【従来の技術】
従来、永久磁石モータの運転又は停止は、例えばインバータと永久磁石モータ間に接触器を設け、この接触器を単にオンオフさせることによって、その目的を達成している。もちろんインバータの起動停止も同時に行われていることは言うまでもない。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来のような制御方法において、特にＰＧレスインバータでは、永久磁石モータに流れる電流から、永久磁石モータの回転数やトルクを数値演算で求めているため、運転開始に永久磁石モータ制御にショックを与えることになり、運転上好ましいものではなかった。
本発明は、上述した点に鑑みて創案されたもので、その目的とするところは、これらの点を解消し、運転開始に永久磁石モータ制御にショックを与えない永久磁石モータの制御方法を提供することにある。
【０００４】
【課題を解決するための手段】
つまり、その目的を達成するための手段は、
１．請求項１において、
永久磁石モータとインバータ間に永久磁石モータをオンオフさせる接触器を設けて制御する制御方法に係わり、前記永久磁石モータの始動時には、トルク成分にならない電流を所定値だけ永久磁石モータに流すようにインバータを制御すると共に、その電流を電流検出器で検出し、該電流が前記所定電流より増加して予め設定された所定値に到達した時点で前記接触器が投入されたと判断すると共に、永久磁石モータにトルク成分電流を流し始めてもよい旨インターロックを外し、定常運転状態へ進むようにインバータを制御することを特徴とした永久磁石電動機の制御方法である。
【０００５】
２．請求項２において、
永久磁石モータとインバータ間に永久磁石モータをオンオフさせる接触器を設けて該接触器を制御する制御方法に係わり、前記永久磁石モータの停止時には、前記接触器をオンさせた状態でインバータからの永久磁石モータへのトルク分電流を制御し、トルク成分にならない電流を所定値以上流すようインバータを制御すると共に、その電流を電流検出器で検出し、該電流が所定値以下になった時点で接触器がオフしたと判断してインバータの出力を停止するようインバータを制御する請求項１記載の永久磁石電動機の制御方法である。
【０００６】
すなわち、本願発明は次のような制御方法である。
永久磁石モータとインバータ間に接触器がある場合のインバータの制御において、接触器がオフしている状態で、フィードバック制御（速度、電流）を有する制御器にてモータの制御を開始した場合、トルク分電流の制御出力が飽和し、接触器がオンした際にモータ制御が正常に行えなくなる。
そこで本特許においては、制御装置によりトルク分にならない電流を所定の電流となるように制御し、接触器がオンすることによりフィードバック電流が所定値となった時点で制御装置は接触器がオンしたと判断し、トルク分電流の制御（通常の運転)に移行する。通常、運転中において接触器がオフした制御装置が判断するためにトルク分電流と合わせてトルク成分にならない電流も制御しつづけ、トルク成分にならない電流が所定値以下となった時点で、接触器はオフしていると判断し、制御装置はインバータの運転を停止する。
以下、本発明の一実施例を図面に基づいて詳述する。
【０００７】
【発明の実施の形態】
図１は本発明の１実施例を示すブロック説明図であり、１はインバータ、２は電源、３は制御装置、４は電流検出器、５は永久磁石モータ、６は接触器である。
図１において、永久磁石モータ５の始動時には、トルク成分にならない電流を所定値だけ永久磁石モータ５に流すようにインバータ１を制御装置３によって制御すると共に、その電流を電流検出器４において検出した電流を制御装置３に伝達する。そして、この検出した電流が前記所定電流より増加して予め設定された所定値に到達した時点で前記接触器６が投入されたと判断すると共に、永久磁石モータ５にトルク成分電流を流し始めてもよい旨インターロックを外し、定常運転状態へ進むようにインバータ１を制御する制御方法である。
【０００８】
また、永久磁石モータ５の停止時には、前記接触器６をオンさせた状態でインバータ１からの永久磁石モータ５へのトルク分電流を制御し、トルク成分にならない電流を所定値だけ流すようインバータ１を制御すると共に、その電流を電流検出器４にて検出して制御装置３に伝達し、この電流が所定値以下になった時点で接触器６がオフしたと判断してインバータ１の出力を停止するようインバータ１を制御する制御方法である。
【０００９】
次にその作用について説明する。
１．接触器６がオンする検出を待つ場合
まず、トルク成分にならない電流を初めインバータ１により所定値に制御し、この電流を電流検出器４にて検出して制御装置３に伝達し、永久磁石モータ５に流れる電流が所定値に到達したとき、つまり接触器６がオンしたことを電流検出器４で検出するようにしておけば、検出器６がオンしても永久磁石モータ５にはショックを与えることなく、システムをスムーズに立ち上げられる。
【００１０】
２．接触器６がオフする検出を待つ場合を図２に基づいて説明する。
パソコン範囲の広い永久磁石モータ５で、弱め界磁領域にあるとき、高速時、インバータ１を停止させると、永久磁石モータ５で発生する誘起電圧まで、点線で示したように跳ね上がり、インバータ１を過電圧破壊することにつながる。
この跳ね上がりを無くすために、すぐにインバータ１を停止させず、図示しているように、電圧Ｖが回転数Ｎに対して一定になる弱め界磁制御で電圧を抑える弱め界磁状態をつづけ、トルク成分にならない電流が所定値以下になった時点で接触器６がオフしたと判断してインバータ１の出力を停止するようインバータ１を制御する。
接触器６がオフすると、インバータ１と永久磁石モータ５が切り離され、永久磁石モータ５に高い誘起電圧が発生してもこの電圧がインバータ１に伝達されることがなく、安全に永久磁石モータ１を停止させることができる。
【００１１】
【発明の効果】
以上説明したように本発明によれば、運転開始にあたって永久磁石モータ制御にショックを与えない永久磁石モータの制御方法を提供することができ、実用上、極めて有用性の高いものである。
【図面の簡単な説明】
【図１】本発明の一実施例を示す説明図である。
【図２】接触器がオフする検出を待つ場合の説明図である。
【符号の説明】
１ インバータ
２ 電源
３ 制御装置
４ 電流検出器
５ 永久磁石モータ
６ 接触器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for controlling a permanent magnet motor, and more particularly to a control method for controlling a contactor by providing a contactor for turning on and off the permanent magnet motor between a permanent magnet motor and an inverter.
[0002]
[Prior art]
Conventionally, a permanent magnet motor is operated or stopped by, for example, providing a contactor between the inverter and the permanent magnet motor and simply turning the contactor on and off to achieve its purpose. Of course, it goes without saying that the inverter is also started and stopped at the same time.
[0003]
[Problems to be solved by the invention]
However, in the conventional control method, especially in the case of a PG-less inverter, the rotation speed and torque of the permanent magnet motor are obtained by numerical calculation from the current flowing through the permanent magnet motor. It was not preferable for operation.
The present invention was devised in view of the above-described points, and its object is to eliminate these points and provide a method for controlling a permanent magnet motor that does not shock the permanent magnet motor control at the start of operation. There is to do.
[0004]
[Means for Solving the Problems]
In other words, the means to achieve that purpose is
1. In claim 1,
The present invention relates to a control method in which a contactor for turning on and off a permanent magnet motor is provided between the permanent magnet motor and the inverter to control the inverter. And the current is detected by a current detector, and when the current increases above the predetermined current and reaches a predetermined value set in advance, it is determined that the contactor is inserted, and a permanent magnet motor The control method for the permanent magnet motor is characterized in that the interlock is removed so that the torque component current may start to flow and the inverter is controlled to proceed to a steady operation state.
[0005]
2. In claim 2,
The present invention relates to a control method in which a contactor for turning on and off a permanent magnet motor is provided between the permanent magnet motor and the inverter to control the contactor. When the permanent magnet motor is stopped, the contactor is turned on and the Controls the current corresponding to the torque to the magnet motor, controls the inverter so that a current that does not become a torque component flows at a predetermined value or more, detects the current with a current detector, and contacts when the current falls below the predetermined value 2. The method of controlling a permanent magnet motor according to claim 1, wherein the inverter is controlled so that the output of the inverter is stopped when it is determined that the heater has been turned off.
[0006]
That is, the present invention is the following control method.
In the control of the inverter when there is a contactor between the permanent magnet motor and the inverter, when the control of the motor is started by a controller having feedback control (speed, current) with the contactor turned off, the torque When the control output of the divided current is saturated and the contactor is turned on, the motor control cannot be performed normally.
Therefore, in this patent, the control device controls the current that is not equal to the torque to become a predetermined current, and when the contactor turns on, the control device turns on the contactor when the feedback current reaches a predetermined value. It shifts to the control of torque current (normal operation). Normally, the control device that has turned off the contactor during operation continues to control the current that does not become a torque component in combination with the torque component current, and when the current that does not become the torque component falls below a predetermined value, the contactor Is determined to be off, and the control device stops the operation of the inverter.
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing an embodiment of the present invention, wherein 1 is an inverter, 2 is a power source, 3 is a control device, 4 is a current detector, 5 is a permanent magnet motor, and 6 is a contactor.
In FIG. 1, when the permanent magnet motor 5 is started, the inverter 1 is controlled by the control device 3 so that a current that does not become a torque component flows through the permanent magnet motor 5 by a predetermined value, and the current is detected by the current detector 4. Current is transmitted to the control device 3. Then, when the detected current increases from the predetermined current and reaches a predetermined value set in advance, it may be determined that the contactor 6 has been turned on, and a torque component current may start to flow through the permanent magnet motor 5. This is a control method for removing the interlock and controlling the inverter 1 so as to proceed to the steady operation state.
[0008]
Further, when the permanent magnet motor 5 is stopped, the current corresponding to the torque from the inverter 1 to the permanent magnet motor 5 is controlled with the contactor 6 turned on so that a current that does not become a torque component flows by a predetermined value. , And the current is detected by the current detector 4 and transmitted to the control device 3, and when the current falls below a predetermined value, it is determined that the contactor 6 is turned off and the output of the inverter 1 is output. This is a control method for controlling the inverter 1 to stop.
[0009]
Next, the operation will be described.
1. When waiting for detection that the contactor 6 is turned on, first, a current that does not become a torque component is first controlled by the inverter 1 to a predetermined value, and this current is detected by the current detector 4 and transmitted to the control device 3 to be a permanent magnet motor. If the current detector 4 detects that the current flowing through 5 reaches a predetermined value, that is, that the contactor 6 is turned on by the current detector 4, a shock is applied to the permanent magnet motor 5 even if the detector 6 is turned on. The system can be set up smoothly without giving it.
[0010]
2. A case of waiting for detection that the contactor 6 is turned off will be described with reference to FIG.
When the inverter 1 is stopped at a high speed when it is in the field-weakening region of the permanent magnet motor 5 having a wide personal computer range, the inverter 1 jumps up to the induced voltage generated by the permanent magnet motor 5 as shown by the dotted line. It leads to overvoltage breakdown.
In order to eliminate this jumping up, the inverter 1 is not stopped immediately, and as shown in the figure, a field weakening state in which the voltage is kept constant by the field weakening control in which the voltage V is constant with respect to the rotation speed N is continued, and the torque component The inverter 1 is controlled to stop the output of the inverter 1 by determining that the contactor 6 is turned off when the current that does not become equal to or less than a predetermined value.
When the contactor 6 is turned off, the inverter 1 and the permanent magnet motor 5 are disconnected, and even if a high induced voltage is generated in the permanent magnet motor 5, this voltage is not transmitted to the inverter 1, and the permanent magnet motor 1 can be safely supplied. Can be stopped.
[0011]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a method for controlling a permanent magnet motor that does not give a shock to the permanent magnet motor control at the start of operation, which is extremely useful in practice.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram when waiting for detection that the contactor is turned off.
[Explanation of symbols]
1 Inverter 2 Power supply 3 Controller 4 Current detector 5 Permanent magnet motor 6 Contactor

Claims (2)

永久磁石モータとインバータ間に永久磁石モータをオンオフさせる接触器を設けて制御する制御方法において、前記永久磁石モータの始動時には、トルク成分にならない電流を所定値だけ永久磁石モータに流すようにインバータを制御すると共に、その電流を電流検出器で検出し、該電流が前記所定電流より増加して予め設定された所定値に到達した時点で前記接触器が投入されたと判断すると共に、永久磁石モータにトルク成分電流を流し始めてもよい旨インターロックを外し、定常運転状態へ進むようにインバータを制御することを特徴とした永久磁石電動機の制御方法。In the control method in which a contactor for turning on and off the permanent magnet motor is provided between the permanent magnet motor and the inverter, and the control is performed, when the permanent magnet motor is started, the inverter is set so that a current that does not become a torque component flows through the permanent magnet motor by a predetermined value. And the current is detected by a current detector, and when the current increases from the predetermined current and reaches a predetermined value set in advance, it is determined that the contactor is inserted, and the permanent magnet motor A control method for a permanent magnet motor, wherein the inverter is controlled so as to proceed to a steady operation state by removing the interlock that the torque component current may start to flow. 永久磁石モータとインバータ間に永久磁石モータをオンオフさせる接触器を設けて該接触器を制御する制御方法において、前記永久磁石モータの停止時には、前記接触器をオンさせた状態でインバータからの永久磁石モータへのトルク分電流を制御し、トルク成分にならない電流を所定値以上け流すようインバータを制御すると共に、その電流を電流検出器で検出し、該電流が所定値以下になった時点で接触器がオフしたと判断してインバータの出力を停止するようインバータを制御する請求項１記載の永久磁石電動機の制御方法。In a control method for controlling a contactor by providing a contactor for turning on and off the permanent magnet motor between the permanent magnet motor and the inverter, the permanent magnet from the inverter with the contactor turned on when the permanent magnet motor is stopped. Controls the current for torque to the motor and controls the inverter so that a current that does not become a torque component flows above a predetermined value, and the current is detected by a current detector. The method for controlling a permanent magnet motor according to claim 1, wherein the inverter is controlled so that the output of the inverter is stopped when it is determined that the heater has been turned off.
JP2002115622A 2002-04-18 2002-04-18 Control method of permanent magnet motor Expired - Lifetime JP3953358B2 (en)

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DE102010042491A1 (en) * 2010-10-15 2012-05-03 BSH Bosch und Siemens Hausgeräte GmbH Pump device for a domestic appliance, domestic appliance and method for operating a drive motor
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