JPH0216669B2 - - Google Patents
Info
- Publication number
- JPH0216669B2 JPH0216669B2 JP56041552A JP4155281A JPH0216669B2 JP H0216669 B2 JPH0216669 B2 JP H0216669B2 JP 56041552 A JP56041552 A JP 56041552A JP 4155281 A JP4155281 A JP 4155281A JP H0216669 B2 JPH0216669 B2 JP H0216669B2
- Authority
- JP
- Japan
- Prior art keywords
- commutation
- power supply
- load
- voltage
- side commutation
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000009499 grossing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/03—Synchronous motors with brushless excitation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【発明の詳細な説明】
本発明は自然転流形の交流式無整流子電動機の
制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling a naturally commutated AC non-commutator motor.
一般に、自然転流形の交流式無整流子電動機に
はサイリスタブリツジ間の転流とブリツジ内のサ
イリスタ素子間の転流とがあるが、以下では前者
を負荷側転流、後者を電源側転流と呼ぶことにす
る。 In general, natural commutation type AC non-commutator motors have commutation between thyristor bridges and commutation between thyristor elements within the bridge, but below, the former is commutation on the load side and the latter on the power supply side. Let's call it commutation.
従来の交流式無整流子電動機の負荷側転流は同
期電動機の逆起電力を利用して行なわれる、いわ
ゆる逆起電力転流である。しかし、この方式では
負荷を増すにつれて転流余裕角が著しく増少し、
このため無負荷転流進み角を45゜〜60゜に設定する
必要があり、電動機力率は0.5〜0.8（進み）とな
る。しかも進み力率で運転するために電機子電流
は減磁作用を生じ、同期電動機は強い励磁を必要
とすることから短絡比の大きな鉄機械となり、電
動機出力に対して容量、重量ともに増大する。さ
らに必要な転流余裕角を確保することから決定さ
れる過負荷耐量の標準は110％、125％で、圧延主
機のようなかこくな用途には適用できないなどの
欠点があつた。 The load-side commutation of a conventional AC non-commutator motor is carried out using the back electromotive force of a synchronous motor, which is so-called back electromotive force commutation. However, with this method, as the load increases, the commutation margin angle increases significantly,
Therefore, it is necessary to set the no-load commutation lead angle to 45° to 60°, and the motor power factor will be 0.5 to 0.8 (advanced). Moreover, since the armature current is operated at a leading power factor, a demagnetizing effect occurs, and the synchronous motor requires strong excitation, resulting in an iron machine with a large short-circuit ratio, resulting in an increase in both capacity and weight relative to the motor output. Furthermore, the standard overload capacity determined by ensuring the necessary commutation margin angle was 110% or 125%, which had the disadvantage of not being applicable to difficult applications such as main rolling machines.
本発明の目的は、前述の欠点を除去し、電動機
力率１の運転をも可能な自然転流形の交流式無整
流子電動機の制御方法を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a control method for a naturally commutated AC type non-commutated motor, which eliminates the above-mentioned drawbacks and allows operation of the motor at a power factor of 1.
以下本発明の一実施例を図面を参照して説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の交流式無整流子電動機のシス
テム構成図で、主回路は１組の１次巻線１と６組
の２次巻線２〜７を持つ電源変圧器、６台のサイ
リスタブリツジ８〜１３、直流リアクトン１４か
ら構成される12相電流形サイクロコンバータであ
る。１５は同期電動機、１６は位置検出器であ
る。 Figure 1 is a system configuration diagram of the AC non-commutator motor of the present invention, in which the main circuit consists of a power transformer having one set of primary windings 1 and six sets of secondary windings 2 to 7, and six sets of power transformers. This is a 12-phase current source cycloconverter consisting of thyristor bridges 8 to 13 and a DC reactor 14. 15 is a synchronous motor, and 16 is a position detector.
従来の方式では、電源側転流は電源電圧を利用
し、負荷側転流は電動機の逆起電力を利用してい
たが、本方式は負荷側転流に電源電圧と逆起電力
を併用することにより、実効転流進み角γ＝０付
近の高力率運転を可能にしたものである。 In conventional methods, power supply side commutation uses the power supply voltage, and load side commutation uses the motor's back electromotive force, but this method uses both the power supply voltage and back electromotive force for load side commutation. This makes it possible to operate at a high power factor near the effective commutation advance angle γ=0.
以下にγ＝０制御の場合の動作原理を説明す
る。第１図の８のブリツジから９のブリツジへの
負荷側転流を考える。いま、８のブリツジ内の導
通しているサイリスタをUp１，Up６とすると、
電源電圧により負荷側転流を行なうには９のブリ
ツジ内のサイリスタを点弧し９のブリツジの出力
電圧を８のブリツジの出力電圧よりも高くしなけ
ればならない。 The operating principle in the case of γ=0 control will be explained below. Consider the load side commutation from bridge 8 to bridge 9 in FIG. Now, if the conductive thyristors in bridge 8 are Up1 and Up6, then
In order to carry out load side commutation using the power supply voltage, the thyristor in the bridge 9 must be fired to make the output voltage of the bridge 9 higher than the output voltage of the bridge 8.
第２図はγ＝０制御時の転流現象を示したもの
で、負荷側転流時刻では電動機電圧は零である
が、直前の負荷側転流の周期から次の負荷側転流
時刻を推定し、電源側転流休止期間を設定するこ
とによつて転流電圧を保持している。本方式では
電源側転流制御角α0を30゜〜150゜としているので
休止期間は1.67ｍｓ以上必要となる。休止期間は
短いほど電流制御特性が良好なので、本方式では
1.67ｍｓとしている。第２図に示す時刻A′での電
源側転流は電源側転流休止信号によつて無視さ
れ、時刻ＡでサイリスタVp２とVp４を点弧し負
荷側転流が始まる。この瞬間は端子Ｕ−Ｖ間の電
動機電圧は零であるから転流電圧は線間電圧eR−
eTとなる。これに対して時刻ＢではWp３とWp４
を点弧しeT−eSを転流電圧としている。図からも
明らかなように、この場合は電源側転流休止信号
により無視される電源側転流は存在しない。 Figure 2 shows the commutation phenomenon during γ = 0 control.The motor voltage is zero at the load side commutation time, but the next load side commutation time can be determined from the cycle of the previous load side commutation. The commutation voltage is maintained by estimating and setting a commutation suspension period on the power supply side. In this system, the commutation control angle α 0 on the power supply side is set to 30° to 150°, so the rest period is required to be 1.67 ms or more. The shorter the rest period, the better the current control characteristics, so in this method,
It is set to 1.67ms. The power supply side commutation at time A' shown in FIG. 2 is ignored by the power supply side commutation stop signal, and at time A the thyristors Vp2 and Vp4 are fired and load side commutation begins. At this moment, the motor voltage between terminals U and V is zero, so the commutation voltage is the line voltage e R −
e becomes T. On the other hand, at time B, Wp3 and Wp4
is ignited, and e T −e S is the commutation voltage. As is clear from the figure, in this case, there is no power supply side commutation that is ignored by the power supply side commutation stop signal.
γ＞０の場合には転流電圧はさらに電動機電圧
が加わるのでγ＝０に比べて安定な転流が行なわ
れる。従来の方式では電流の重なり期間中に動作
しているサイリスタブリツジの出力電圧は等しい
ので転流電圧として利用できないが、以上に述べ
たように本方式では電流の重なり期間中に動作し
ているサイリスタブリツジの出力電圧の差を転流
電圧として利用するものである。 When γ>0, the motor voltage is further added to the commutation voltage, so commutation is more stable than when γ=0. In the conventional method, the output voltages of the thyristor bridges operating during the current overlap period are equal, so they cannot be used as commutation voltages, but as described above, in this method, the thyristor bridges operate during the current overlap period. The difference in output voltage of the thyristor bridge is used as commutation voltage.
次に制御回路について説明する。第１図で示す
ように制御回路は速度制御回路１８、電源側転流
制御回路１９、負荷側転流制御回路２０、ゲート
制御回路２１で構成されている。 Next, the control circuit will be explained. As shown in FIG. 1, the control circuit includes a speed control circuit 18, a power supply side commutation control circuit 19, a load side commutation control circuit 20, and a gate control circuit 21.
負荷側転流制御回路では周波数について閉ルー
プが形成されており、同期電動機１５の端子電圧
検出器１６と位置検出器１７の出力とから端子電
圧と同期した負荷側転流指令が作られる。これは
デイジタルICで構成された移相回路により実効
転流進み角γを0゜〜30゜まで制御でき、γ＝０の
場合は電源電圧による転流を、γ＞０の場合は電
源転流と逆起電力転流を併用した転流を行うこと
になる。 In the load side commutation control circuit, a closed loop is formed regarding the frequency, and a load side commutation command synchronized with the terminal voltage is generated from the outputs of the terminal voltage detector 16 and the position detector 17 of the synchronous motor 15. This allows the effective commutation advance angle γ to be controlled from 0° to 30° using a phase shift circuit made up of a digital IC. Commutation will be performed using a combination of back electromotive force commutation and back electromotive force commutation.
電源側転流制御回路では電流フイードバツク系
が構成され、平滑リアクトル１４の電流iLが速度
制御回路１８からの電流指令に追従するように電
源側転流指令を制御している。 The power supply side commutation control circuit constitutes a current feedback system, and controls the power supply side commutation command so that the current i L of the smoothing reactor 14 follows the current command from the speed control circuit 18.
ゲート制御回路２１では電源側転流指令、負荷
側転流指令、電源電圧を入力して点弧すべきサイ
リスタが決定される。前述したように本方式では
負荷側転流時刻の直前1.67ｍｓ内の電源側転流を
休止して負荷側転流を電源側転流よりも優先しな
ければならない。 In the gate control circuit 21, the power supply side commutation command, the load side commutation command, and the power supply voltage are inputted to determine the thyristor to be fired. As mentioned above, in this method, the power supply side commutation must be stopped within 1.67 ms immediately before the load side commutation time to give priority to the load side commutation over the power supply side commutation.
第３図は第１図におけるＰ側のサイリスタブリ
ツジ８，９，１０の電源側転流休止信号決定回路
で、第４図はこの回路のタイムチヤートである。
これは直前の負荷側転流の周期をUP／DOWNカ
ウンタを用いて計数し、次の負荷側転流時刻を推
定しようとするもので、図中のＰ側ブリツジの負
荷側転流時刻からアツプカウントを開始し、次の
Ｎ側ブリツジの負荷側転流時刻からダウンカウン
トを行ないカウンタの内容が休止期間設定値に一
致した時刻にフリツプフロツプをセツトし、次の
Ｐ側ブリツジの負荷側転流時刻にリセツトする。
このフリツプフロツプがセツトされている期間は
Ｐ側ブリツジの電源側転流を無視すればよい。負
荷側転流時に点弧すべきサイリスタの決定は、電
源周期を制御角が0゜〜60゜の６つの期間に分割し、
ブリツジ電圧が最大となるようにそれぞれの期間
にブリツジを構成している６個のサイリスタを対
応させることによつて行なつている。 FIG. 3 is a power supply side commutation stop signal determination circuit for the P-side thyristor bridges 8, 9, and 10 in FIG. 1, and FIG. 4 is a time chart of this circuit.
This attempts to estimate the next load-side commutation time by counting the cycle of the previous load-side commutation using an UP/DOWN counter. Start counting, count down from the load side commutation time of the next N side bridge, set the flip-flop at the time when the contents of the counter match the idle period setting value, and start the load side commutation time of the next P side bridge. Reset to .
During the period when this flip-flop is set, the power supply side commutation of the P side bridge can be ignored. To determine which thyristor to fire during load-side commutation, the power supply cycle is divided into six periods with control angles of 0° to 60°.
This is done by associating the six thyristors forming the bridge with each period so that the bridge voltage is maximized.
上記においては第１図に示す交流式無整流子電
動機について説明したが、Δ−Δ（Δ−Ｙでもよ
い）の電源変圧器を３台用いた第５図に示す交流
式無整流子電動機においても同様な制御が可能に
なることは言うまでもない。なお、この場合は第
１図の方式と比較して電源変圧器の構成が簡単に
なるが、平滑リアクトルを流れる電流iLはリツプ
がわずかに増加する。 In the above, the AC type non-commutator motor shown in Fig. 1 has been explained, but in the AC type non-commutator motor shown in Fig. 5 using three Δ-Δ (Δ-Y may also be used) power transformers, Needless to say, similar control becomes possible. In this case, the configuration of the power transformer becomes simpler than in the system shown in FIG. 1, but the rip of the current i L flowing through the smoothing reactor increases slightly.
第１図は本発明の一実施例を示す交流式無整流
子電動機のシステム構成図、第２図は同実施例に
おいて、γ＝０制御時の負荷側転流の動作を説明
するためのタイムチヤートを示す図、第３図は同
じくＰ側サイリスタブリツジの電源側転流休止信
号決定回路図、第４図は第３図の動作を説明する
ためのタイムチヤートを示す図、第５図は第１図
の主回路の電源変圧器の変形例を示す回路構成図
である。
１〜７……電源トランス、８〜１３……サイリ
スタブリツジ、１４……平滑リアクトル、１５…
…同期電動機、１６……位置検出器、１７……電
圧検出器、１８……速度制御回路、１９……電源
側転流制御回路、２０……負荷側転流制御回路、
２１……ゲート制御回路。
Fig. 1 is a system configuration diagram of an AC non-commutator motor showing an embodiment of the present invention, and Fig. 2 is a time diagram for explaining the operation of load side commutation when γ = 0 control in the same embodiment. 3 is a power supply side commutation stop signal determination circuit diagram of the P-side thyristor bridge, FIG. 4 is a time chart for explaining the operation of FIG. 3, and FIG. 5 is a diagram showing a time chart for explaining the operation of FIG. FIG. 2 is a circuit configuration diagram showing a modification of the power transformer of the main circuit of FIG. 1; 1 to 7...Power transformer, 8 to 13...Thyristor bridge, 14...Smoothing reactor, 15...
...Synchronous motor, 16...Position detector, 17...Voltage detector, 18...Speed control circuit, 19...Power side commutation control circuit, 20...Load side commutation control circuit,
21...Gate control circuit.
Claims (1)
て、電源側転流時は電源側転流指令によりサイリ
スタブリツジ内のサイリスタ素子間の転流制御を
行ない、負荷側転流時であつて実効転流進み角γ
が、γ＝０の場合は直前の負荷側転流周期から次
の負荷側転流時刻を推定して電源側転流指令に休
止期間を設けることにより、負荷側転流指令によ
つて動作させるサイリスタブリツジの出力電圧と
転流前に動作しているサイリスタブリツジの出力
電圧との差から得られる転流電圧により転流制御
し、γ＞０の場合は同期電動機の逆起電力を転流
電圧として用いて転流制御を行なうことを特徴と
する交流式無整流子電動機の制御方法。1 In a natural commutation type AC non-commutator motor, commutation control between the thyristor elements in the thyristor bridge is performed by the power supply side commutation command during power side commutation, and the Commutation advance angle γ
However, if γ = 0, the next load-side commutation time is estimated from the previous load-side commutation period and a pause period is provided for the power-side commutation command, so that the load-side commutation command is used to operate. Commutation is controlled by the commutation voltage obtained from the difference between the output voltage of the thyristor bridge and the output voltage of the thyristor bridge operating before commutation, and when γ > 0, the back electromotive force of the synchronous motor is A control method for an AC non-commutator motor, characterized in that commutation control is performed using a current voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56041552A JPS57156694A (en) | 1981-03-20 | 1981-03-20 | Control system of ac commutatorless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56041552A JPS57156694A (en) | 1981-03-20 | 1981-03-20 | Control system of ac commutatorless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57156694A JPS57156694A (en) | 1982-09-28 |
| JPH0216669B2 true JPH0216669B2 (en) | 1990-04-17 |
Family
ID=12611586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56041552A Granted JPS57156694A (en) | 1981-03-20 | 1981-03-20 | Control system of ac commutatorless motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57156694A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04275784A (en) * | 1991-03-04 | 1992-10-01 | Matsushita Electric Ind Co Ltd | Video signal switching device |
| JPH07274220A (en) * | 1991-01-24 | 1995-10-20 | Grass Valley Group Inc:The | Television signal decoder |
-
1981
- 1981-03-20 JP JP56041552A patent/JPS57156694A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07274220A (en) * | 1991-01-24 | 1995-10-20 | Grass Valley Group Inc:The | Television signal decoder |
| JPH04275784A (en) * | 1991-03-04 | 1992-10-01 | Matsushita Electric Ind Co Ltd | Video signal switching device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57156694A (en) | 1982-09-28 |
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