JP2646822B2 - Inverter operation state switching method - Google Patents
Inverter operation state switching methodInfo
- Publication number
- JP2646822B2 JP2646822B2 JP2250967A JP25096790A JP2646822B2 JP 2646822 B2 JP2646822 B2 JP 2646822B2 JP 2250967 A JP2250967 A JP 2250967A JP 25096790 A JP25096790 A JP 25096790A JP 2646822 B2 JP2646822 B2 JP 2646822B2
- Authority
- JP
- Japan
- Prior art keywords
- inverter
- state
- voltage
- switching
- operation state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、誘導電動機を速度制御するインバータの該
電動機に対するインバータ運転状態から直流制動状態へ
の運転状態切替方法に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for switching the operation state of an inverter for controlling the speed of an induction motor from an inverter operation state to a DC braking state for the motor.
従来のこの種の運転状態切替方法としては、第４図に
示すインバータ出力電圧Viの動作波形図に示す如く、前
記の如き運転状態の切替指令を受けると、所定周波数の
交流電圧出力状態から所定の直流電圧出力状態に直ちに
切替移行させるものが知られている。As a conventional operation state switching method of this kind, as shown in an operation waveform diagram of an inverter output voltage Vi shown in FIG. 4, when an operation state switching command is received as described above, a predetermined frequency is changed from an AC voltage output state at a predetermined frequency. Is immediately switched to the DC voltage output state.
しかしながら上記の如き従来の切替方法においては、
前記の如き運転状態の切替直前におけるインバータ出力
周波数の高い場合には、前記運転状態の切替瞬時に負荷
誘導電動機の内部逆起電力に起因する過大電流が流れ、
前記インバータがその保護停止に至る危険があった。However, in the conventional switching method as described above,
When the inverter output frequency is high immediately before the switching of the operating state as described above, an excessive current due to the internal back electromotive force of the load induction motor flows at the instant of the switching of the operating state,
There was a risk that the inverter would reach its protection stop.
上記に鑑み本発明は、前記の如き運転状態の切替直前
のインバータ出力周波数高低如何にかかわらず円滑な直
流制動状態への切替移行を可能とするインバータの運転
状態切替方法の提供を目的とするものである。In view of the above, an object of the present invention is to provide an inverter operating state switching method that enables a smooth transition to a DC braking state regardless of whether the inverter output frequency is high or low immediately before switching the operating state. It is.
上記目的を達成するために、本発明のインバータの運
転状態切替方法は、誘導電動機を速度制御するインバー
タの該電動機に対するインバータ運転状態から直流制動
状態への運転状態切替方法であって、その出力を断状態
となす前記インバータの運転停止から所定時間後に所定
の直流電圧による直流制動状態に移行させるものであ
り、前記所定時間を前記インバータの運転停止直前の出
力周波数の関数として規定すると共に前記直流電圧を所
定の勾配によりその所定の定常値まで昇圧させるものと
し、或いはまた前記インバータの交流出力電圧を前記直
流制動状態における所定の直流電圧まで所定の勾配に従
って低減させ、該両電圧の一致時点以後の前記直流電圧
による直流制動状態に移行させ、更に前記インバータの
交流出力電圧の低減勾配を該インバータの出力電流値に
関連させその許容値を超えぬように自動調節するものと
する。In order to achieve the above object, an operation state switching method for an inverter according to the present invention is a method for switching an operation state of an inverter that controls the speed of an induction motor from an inverter operation state to a DC braking state for the electric motor. A predetermined time after a stop of the operation of the inverter to be switched to a DC braking state by a predetermined DC voltage, wherein the predetermined time is defined as a function of an output frequency immediately before the stop of the operation of the inverter, and Is increased to a predetermined steady-state value by a predetermined gradient, or the AC output voltage of the inverter is reduced according to a predetermined gradient to a predetermined DC voltage in the DC braking state, and after the time when the two voltages coincide with each other. The state is shifted to the DC braking state by the DC voltage, and the AC output voltage of the inverter is further reduced. The shall automatically adjusted so as not to exceed the permissible value in connection with the output current value of the inverter.
インバータによる誘導電動機に対する所定周波数ｆの
インバータ運転状態から直流制動状態への切替時におけ
るインバータ過電流発生の原因となる該電動機の内部逆
起電力Ecは下記の式（１）の如くなる。Internal counter electromotive force E c of the electric motor causing the inverter overcurrent at the time of switching to the DC braking state from the inverter operating condition of a predetermined frequency f with respect to the induction motor by the inverter is as the following equation (1).
Ec=k1・Noe-t/T ……（１） 但しNoは前記運転状態の切替直前におけるインバータ出
力周波数foに対応する前記電動機の回転数、Ｔは減衰時
定数、k1は定数である。式（１）の示す通り逆起電力Ec
は、前記Noが大なる程、すなわち前記foが高い程大とな
り、従ってその支障のない値までの低減所要時間も長く
なる。なお第５図は逆起電力Ecを発生する前記誘導電動
機の等価回路図であり、誘導電動機２においてR1とR2と
はそれぞれ１次及び２次抵抗、L1とL2とはそれぞれ１次
及び２次インダクタンス、Ｍは励磁インダクタンス、ま
た１はその出力電圧をViとするインバータの電源表示で
ある。 E c = k 1 · N o e -t / T ...... (1) where N o is the rotational speed of the electric motor corresponding to the inverter output frequency f o at immediately before the switching of the operating state, T is the decay time constant, k 1 is a constant. As shown in equation (1), back electromotive force E c
Becomes larger as the value of N o increases, that is, as the value of f o increases, and the time required for reducing the value to a value that does not cause a problem also increases. Note FIG. 5 is an equivalent circuit diagram of the induction motor for generating a counter electromotive force E c, induced in motor 2 R 1 respectively primary and secondary resistance and R 2, L 1 and L 2 and respectively primary and secondary inductance, M is the excitation inductance, also 1 is a power display of the inverter to the output voltage V i.
上記に従って本発明の第１は、逆起電力Ecの減衰用
に、前記の如き運転状態切替時に設ける前記インバータ
の運転停止期間を下記の式（２）に従う時間toffにより
規定するものである。The first invention according to the above is for attenuation of the counter electromotive force E c, the operation stop period of said inverter provided at the such operation state switching of prescribes the time t off according to formula (2) below .
toff=to+k2・fo ……（２） 但しtoは許容最大停止時間、k2は定数である。 t off = t o + k 2 · f o ...... (2) but t o is the maximum allowable stop time, k 2 is a constant.
また本発明の第２は、インバータ運転状態の出力電圧
Viを直流運転状態における所定の直流電圧までその最大
値において所定の勾配にて低減させておくものであり、
前記運転状態切替の瞬時における該両状態の電圧差を小
となして前記インバータ過電流の防止を図るものであ
る。A second aspect of the present invention is an output voltage in an inverter operating state.
V i is reduced at a predetermined gradient at a maximum value thereof up to a predetermined DC voltage in a DC operation state,
The present invention aims to prevent the inverter overcurrent by reducing the voltage difference between the two states at the moment of the operation state switching.
更に本発明の第３は前記の如き電圧Viの低減制御にお
ける低減勾配をインバータ出力電流Iiに連動させ、該電
流Iiがその許容値を超過しないよう前記低減勾配を自動
調節するものであり、該勾配を前記電流Iiが大となると
緩やかなものとし、同じくIiが小となれば急なものとな
すものである。A third aspect of the present invention is to link the reduction gradient in the voltage V i reduction control with the inverter output current I i and to automatically adjust the reduction gradient so that the current I i does not exceed its allowable value. There was a gentle when the the gradient the current I i is large, well I i is a component of those sudden if small.
以下本発明の実施例を図面により説明する。第１図，
第２図，第３図はそれぞれ本発明の方法に従った場合の
インバータ出力電圧Viの動作波形図である。Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1,
Figure 2, Figure 3 is an operation waveform diagram of the inverter output voltage V i when in accordance with the method of the present invention, respectively.
先ず第１図は、インバータ運転状態を時刻t1にて停止
し、時刻t2の直流制動開始時点までに継続時間toff(t
off=t2-t1)のインバータ停止期間を設け更に時刻t2以降
t3まで、前記逆起電力の残留を見込んで、直流出力電圧
を適当な勾配にて昇圧させ、時刻t3以降は直流制動状態
での所定電圧となす状態を示すものである。First Figure 1 stops the inverter operation state at time t 1, the duration until the DC braking start time point of time t 2 t off (t
off = t 2 -t 1 ), and an inverter stop period is provided, and after time t 2
to t 3, in anticipation of the residual of the counter electromotive force, to boost the DC output voltage at a suitable slope, the time t 3 after illustrates a state forming a predetermined voltage at the DC braking state.
次に第２図は、インバータ出力電圧Viをその最大値に
おいて図示一点鎖線の包絡線に沿って適当な勾配にて直
流制動状態における所定直流電圧と等しくなるまで低減
させ、該両電圧の一致時点以降直流制動状態に移行させ
る状態を示すものである。Next, the second figure is reduced to equal to the predetermined DC voltage at the DC braking state inverter output voltage V i at appropriate gradient along the envelope of the illustrated one-dot chain line in its maximum value, of the both voltages match This shows a state in which the state shifts to the DC braking state after the time point.
更に第３図は、前記第２図における前記電圧Viの低減
勾配を、インバータ出力電流Iiと連動変化させ、図示一
点鎖線の包絡線に沿って、該電流Iiの大なる場合は緩や
かな、逆に該電流Iiの小なる場合は急峻なものとして自
動調節した状態を示すものである。Further, FIG. 3 shows that the decreasing gradient of the voltage V i in FIG. 2 is changed in conjunction with the inverter output current I i, and along the dashed-dotted line envelope, the current I i becomes gentle when it becomes large. Do, if small consisting of the current I i in the reverse shows a state in which the automatic adjustment as steep.
本発明によれば、誘導電動機を速度制御するインバー
タの該電動機に対するインバータ運転状態から直流制動
状態への切替時、該両状態間に前記電動機の逆起電力の
減衰時間に応じたインバータ停止期間を設けるか、或い
は前記インバータの交流出力電圧の最大値が直流制動時
の所定直流電圧値と等しくなるまで適当な勾配にて低減
させ更には該低減勾配をインバータ出力電流に連動させ
て自動変化させた後に直流制動に移行させることによ
り、インバータ運転状態時のインバータ出力周波数の高
低に関係無く且つインバータ出力電流の過電流状態の発
生を招くこと無く、前記の如き運転状態の切替えを円滑
に行うことができる。According to the present invention, when the inverter for controlling the speed of the induction motor is switched from the inverter operation state to the DC braking state for the motor, an inverter stop period corresponding to the decay time of the back electromotive force of the motor is provided between the two states. Provided or reduced at an appropriate gradient until the maximum value of the AC output voltage of the inverter becomes equal to a predetermined DC voltage value at the time of DC braking, and further, the reduced gradient is automatically changed in conjunction with the inverter output current. By shifting to DC braking later, it is possible to smoothly switch the operating state as described above regardless of the level of the inverter output frequency during the inverter operating state and without causing the occurrence of an overcurrent state of the inverter output current. it can.
第１図と第２図と第３図とはそれぞれ本発明の運転状態
切替方法による場合のインバータ出力電圧の動作波形
図、第４図は同じく従来の方法による場合の動作波形
図、第５図は誘導電動機の等価回路図である。 １……インバータ（電源表示）、２……誘導電動機（等
価表示）、R1……誘導電動機１次抵抗、R2……同２次抵
抗、L1……同１次インダクタンス、L2……同２次インダ
クタンス、Ｍ……同励磁インダクタンス、Vi……インバ
ータ出力電圧、Ii……インバータ出力電流、Ec……誘導
電動機内部逆起電力。FIGS. 1, 2, and 3 are operation waveform diagrams of the inverter output voltage in the case of using the operation state switching method of the present invention, respectively. FIG. 4 is an operation waveform diagram in the case of the conventional method, and FIG. FIG. 2 is an equivalent circuit diagram of the induction motor. 1 ...... inverter (power indicator), 2 ...... induction motor (equivalent display), R 1 ...... induction motor primary resistance, R 2 ...... same secondary resistance, L 1 ...... the primary inductance, L 2 ... ... Secondary inductance, M ... Exciting inductance, V i ... Inverter output voltage, I i ... Inverter output current, E c ... Induction motor internal back electromotive force.
Claims (3)
電動機に対するインバータ運転状態から直流制動状態へ
の運転状態切替方法であって、その出力を断状態となす
前記インバータの運転停止から所定時間後に所定の直流
電圧による直流制動状態に移行させるものであり、前記
所定時間を前記インバータの運転停止直前の出力周波数
の関数として規定すると共に前記直流電圧を所定の勾配
によりその所定の定常値まで昇圧させることを特徴とす
るインバータの運転状態切替方法。1. A method for switching an operation of an inverter for controlling the speed of an induction motor from an inverter operation state to a DC braking state for the electric motor, the method comprising: The DC voltage is shifted to a DC braking state, and the predetermined time is defined as a function of an output frequency immediately before the operation of the inverter is stopped, and the DC voltage is raised to a predetermined steady value by a predetermined gradient. A method for switching the operation state of an inverter, characterized in that:
電動機に対するインバータ運転状態から直流制動状態へ
の運転状態切替方法であって、前記インバータの交流出
力電圧を前記直流制動状態における所定の直流電圧まで
所定の勾配に従って低減させ、該両電圧の一致時点以後
に前記直流電圧による直流制動状態に移行させることを
特徴とするインバータの運転状態切替方法。2. A method for switching the operation of an inverter for controlling the speed of an induction motor from an inverter operation state to a DC braking state for the motor, the method comprising: changing an AC output voltage of the inverter to a predetermined DC voltage in the DC braking state. A method for switching the operation state of an inverter, comprising reducing the voltage according to a predetermined gradient, and shifting to a DC braking state by the DC voltage after a point in time when the two voltages match.
方法において、前記インバータの交流出力電圧の低減勾
配を該インバータの出力電流値に関連させその許容値を
超えぬように自動調節することを特徴とするインバータ
の運転状態切替方法。3. A method according to claim 2, wherein the decreasing gradient of the AC output voltage of the inverter is related to an output current value of the inverter and is automatically adjusted so as not to exceed an allowable value. A method for switching the operation state of the inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2250967A JP2646822B2 (en) | 1990-09-20 | 1990-09-20 | Inverter operation state switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2250967A JP2646822B2 (en) | 1990-09-20 | 1990-09-20 | Inverter operation state switching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04133687A JPH04133687A (en) | 1992-05-07 |
| JP2646822B2 true JP2646822B2 (en) | 1997-08-27 |
Family
ID=17215689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2250967A Expired - Fee Related JP2646822B2 (en) | 1990-09-20 | 1990-09-20 | Inverter operation state switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2646822B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013240195A (en) * | 2012-05-15 | 2013-11-28 | Mitsubishi Electric Corp | Acceleration deceleration controller |
-
1990
- 1990-09-20 JP JP2250967A patent/JP2646822B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04133687A (en) | 1992-05-07 |
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