JP2000107645A - Controller of centrifuge - Google Patents
Controller of centrifugeInfo
- Publication number
- JP2000107645A JP2000107645A JP10277808A JP27780898A JP2000107645A JP 2000107645 A JP2000107645 A JP 2000107645A JP 10277808 A JP10277808 A JP 10277808A JP 27780898 A JP27780898 A JP 27780898A JP 2000107645 A JP2000107645 A JP 2000107645A
- Authority
- JP
- Japan
- Prior art keywords
- power source
- value
- power supply
- induction machine
- supply current
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、多種のロータ負荷
を駆動する遠心機の制御装置に於いて、特にロータの加
速回転時に遠心機に流れる電源電流を所定値内に抑制す
る制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a centrifuge for driving various types of rotor loads, and more particularly to a control device for suppressing a power supply current flowing through the centrifuge to a predetermined value when the rotor is accelerated. It is.
【０００２】[0002]
【従来の技術】遠心機に使用される誘導機及びインバー
タに要求される一つの機能としては、誘導機の回転軸に
載せたロータを最短時間で加速・減速させることにある
が、遠心機の負荷であるロータは多種類あり、それぞれ
の慣性モーメントが異なる。従って、高速な加速特性を
実現するために、加速時にロータの種類に関係なく同じ
パルス幅変調制御によりインバータを制御して誘導機を
駆動すると、慣性モーメントの小さいロータは電源電流
が定格値を超えることはないが、高回転数、慣性モーメ
ントの大きいロータは加速時の所要エネルギーが大きい
ため電源電流が例えば１５Ａ等の定格値を超える場合が
ある。電源電流が定格値を超える量が過大になると電源
側にあるブレーカコンセントの過電流遮断動作により、
遠心機への電源供給を停止することがしばしば発生し、
遠心機とロータの組み合わせによっては、遠心機の加速
性能が十分に発揮できない等の不都合があった。2. Description of the Related Art One function required for an induction machine and an inverter used in a centrifuge is to accelerate and decelerate a rotor mounted on a rotating shaft of the induction machine in a shortest time. There are many types of rotors as loads, and each has a different moment of inertia. Therefore, in order to realize high-speed acceleration characteristics, when the induction machine is driven by controlling the inverter by the same pulse width modulation control regardless of the type of rotor during acceleration, the rotor having a small inertia moment has a power supply current exceeding the rated value. However, a rotor having a high rotation speed and a large moment of inertia requires a large amount of energy during acceleration, so that the power supply current may exceed a rated value of, for example, 15 A. If the amount of power supply current exceeding the rated value becomes excessive, the overcurrent cutoff operation of the breaker outlet on the power supply side will cause
It often happens that the power supply to the centrifuge is stopped,
Depending on the combination of the centrifuge and the rotor, there was an inconvenience that the acceleration performance of the centrifuge could not be sufficiently exhibited.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は上記し
た従来技術の欠点を排除し、遠心機とロータの組み合わ
せにかかわらず、供給電源容量の範囲内で最大限のエネ
ルギーをロータの加速時に付与可能な遠心機の制御装置
を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art, and to maximize the energy within the range of the power supply capacity when accelerating the rotor, regardless of the combination of the centrifuge and the rotor. An object of the present invention is to provide a centrifuge control device that can be provided.
【０００４】[0004]
【課題を解決するための手段】上記目的は、ロータを回
転させる誘導機を駆動するインバータに於いて、インバ
ータをパルス幅制御するＣＰＵが遠心機の電源電流を測
定する電源電流検出回路から電流値のアナログ値を取り
込み、その取り込んだ値が予め定められた値を超えた場
合、超えた割合に応じて誘導機に印加する電圧をパルス
幅制御により抑制し、電源電流を所定値内に抑制するこ
とにより達成される。SUMMARY OF THE INVENTION It is an object of the present invention to provide an inverter for driving an induction machine for rotating a rotor, wherein a CPU for controlling a pulse width of the inverter detects a current value from a power supply current detection circuit for measuring a power supply current of the centrifuge. If the captured value exceeds a predetermined value, the voltage applied to the induction machine is suppressed by pulse width control in accordance with the exceeded value, and the power supply current is suppressed within a predetermined value. This is achieved by:
【０００５】[0005]
【発明の実施の形態】以下、本発明の具体的実施例を図
に基づいて詳細に説明する。図１に於いて、１は交流電
源、２は遠心機本体の電源スイッチ、３は遠心機本体の
電源を遮断するヒューズ等の電源電流遮断手段、１０は
パルス幅変調制御方式により整流素子４の出力をコンデ
ンサ１４で平滑した直流出力に接続されたインバータ５
を制御するマイクロプロセッサ（以下ＣＰＵと称す）で
あり、インバータ５により誘導機となるモータ６を駆動
する。１１は誘導機の回転軸にクラウン等を介して回転
させられるロータである。７は遠心機本体に流れる電源
電流をそれに比例した電圧に変換するカレントトランス
であり、その出力は整流素子９と更に抵抗器１２、コン
デンサ１３から成る積分回路を介しＣＰＵ１０のアナロ
グポートに接続されており、電源電流検出回路を１６で
示す。カレントトランス７の出力は電源電流が定格値に
達する時に予め定められた出力電圧に合うように抵抗器
８を設定する。１５は誘導機６の回転パルスを出力する
エンコーダであり、誘導機６の回転数に逆比例したパル
ス幅の信号をＣＰＵ１０に出力している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, 1 is an AC power supply, 2 is a power switch of a centrifuge main body, 3 is a power supply current cutoff means such as a fuse for cutting off the power supply of the centrifuge main body, and 10 is a pulse width modulation control method of a rectifying element 4. Inverter 5 connected to a DC output whose output is smoothed by capacitor 14
(Hereinafter referred to as CPU), and drives a motor 6 serving as an induction machine by an inverter 5. Reference numeral 11 denotes a rotor that is rotated by a rotation shaft of the induction machine via a crown or the like. Reference numeral 7 denotes a current transformer for converting a power supply current flowing through the centrifuge body into a voltage proportional to the current. An output of the current transformer 7 is connected to an analog port of the CPU 10 via an integration circuit including a rectifier 9 and a resistor 12 and a capacitor 13. The power supply current detection circuit is indicated by 16. The resistor 8 is set so that the output of the current transformer 7 matches a predetermined output voltage when the power supply current reaches the rated value. An encoder 15 outputs a rotation pulse of the induction machine 6, and outputs a signal having a pulse width inversely proportional to the rotation speed of the induction machine 6 to the CPU 10.
【０００６】ＣＰＵ１０はインバータ５の制御の他に温
度制御、操作パネル１７の制御等を行なっている。遠心
機の電源が電源スイッチ２によりオンされると、ＣＰＵ
１０はポートや周辺ＩＣの初期化を行なう。操作パネル
１７で目標回転数等をセットしロータ１１を所定の回転
数まで誘導機６が加速する時は、ＣＰＵ１０からパルス
幅変調制御方式によりインバータ５を制御し、モータ６
を加速させる。この時ＣＰＵ１０は遠心機本体に流れる
電源電流を電源電流検出回路１６のアナログ出力により
常時モニタする。ＣＰＵ１０はこのアナログ電圧を内部
でＡ／Ｄ変換し、変換した値と電源電流の制限値とを常
時比較する。電源電流値がその制限値を超えるとＣＰＵ
１０は最適なパルス幅変調制御縮小量を選択し、その選
択したパルス幅変調制御縮小量に応じてモータ６に印加
される印加電圧を抑制し、電源電流を所定値内に抑制す
るように制御する。The CPU 10 performs temperature control, control of the operation panel 17 and the like in addition to control of the inverter 5. When the power of the centrifuge is turned on by the power switch 2, the CPU
Reference numeral 10 initializes ports and peripheral ICs. When the induction machine 6 accelerates the rotor 11 to a predetermined rotation speed by setting a target rotation speed or the like on the operation panel 17, the CPU 10 controls the inverter 5 by a pulse width modulation control method, and
Accelerate. At this time, the CPU 10 constantly monitors the power supply current flowing through the centrifuge body by the analog output of the power supply current detection circuit 16. The CPU 10 internally converts the analog voltage into a digital signal, and constantly compares the converted value with a power supply current limit value. When the power supply current value exceeds the limit value, the CPU
A control 10 selects an optimal pulse width modulation control reduction amount, controls the applied voltage applied to the motor 6 according to the selected pulse width modulation control reduction amount, and controls the power supply current to be within a predetermined value. I do.
【０００７】図３は、ＣＰＵ１０からインバータ５に出
力される制御線１８の出力信号の様子を画いた図であ
り、図１と同一の部分には同一の番号が付してあり、６
個のｉＧＢＴ等のスイッチ素子に６０°遅れのＵ＋、Ｖ
＋、Ｗ＋とこれと供役なＵ−、Ｖ−、Ｗ−のＯＮ信号を
印加するものに於いて、Ｕ−、Ｖ−、Ｗ−にパルス幅変
調制御を加えるものであり、パルス幅１周期Ｔのうちの
オン期間ｔが長い程モータ６への印加電圧は大きくな
る。また、０〜３６０°の１周期がモータ６に励磁出力
されるすべり周波数となる。FIG. 3 is a diagram illustrating a state of an output signal of a control line 18 outputted from the CPU 10 to the inverter 5, and the same parts as those of FIG.
U +, V with 60 ° delay to switch elements such as iGBT
In applying the ON signals of +, W + and U-, V-, W- serving as the same, pulse width modulation control is applied to U-, V-, W-, and the pulse width is 1 The longer the on-period t of the cycle T, the greater the voltage applied to the motor 6. Further, one cycle of 0 to 360 ° is the slip frequency that is excited and output to the motor 6.
【０００８】図２は、ＣＰＵ１０による電源電流の抑制
制御を示した一実施例となるフローチャートである。更
に、図４に本発明を実施し慣性モーメントの大きいロー
タ１１を急加速した時の電源電流の制限値と遠心機本体
に流れる電流の抑制の様子を示す。処理１０１により加
速中か減速中かを判断し、加速中であれば処理１０２に
よりエンコーダ１５の信号出力からモータ６の回転数を
測定し、処理１０３により予め定められたモータ６の回
転数に対応したいわゆるモータ電圧V／すべり周波数ｆ
によりモータ６を加速し、処理１０４により遠心機本体
に流れる電源電流値と予め定められた電源電流の制限値
を比較し、電源電流値が大きければ処理１０５により電
源電流値と制限値との差分を求め、その差分から処理１
０６により予め定められたパルス幅変調制御縮小量を選
択し、処理１０７により選択されたパルス幅変調制御縮
小量を出力させるように処理し、電源電流値を予め定め
られた値以下の一定値に抑制制御する。FIG. 2 is a flow chart showing an embodiment of the power supply current suppression control by the CPU 10. Further, FIG. 4 shows a limit value of a power supply current when the rotor 11 having a large moment of inertia is suddenly accelerated by implementing the present invention, and how the current flowing through the centrifuge body is suppressed. In step 101, it is determined whether the vehicle is accelerating or decelerating. If the vehicle is accelerating, the number of revolutions of the motor 6 is measured from the signal output of the encoder 15 in step 102, and the number of revolutions of the motor 6 is determined in step 103. So-called motor voltage V / slip frequency f
To accelerate the motor 6, and compare the power supply current value flowing through the centrifuge body with a predetermined limit value of the power supply current in the processing 104. If the power supply current value is large, the difference between the power supply current value and the limit value is obtained in the processing 105. Is obtained, and processing 1 is performed from the difference.
06, a predetermined pulse width modulation control reduction amount is selected, a process is performed to output the pulse width modulation control reduction amount selected in step 107, and the power supply current value is set to a constant value equal to or less than the predetermined value. Perform suppression control.
【０００９】[0009]
【発明の効果】本発明によれば、ＣＰＵが遠心機本体の
電源電流を検出し、誘導機を駆動するインバータに流れ
る電流が電源電流値の定められた値以下の一定値になる
ようにインバータに対してパルス幅変調制御するように
したので、遠心機とロータの組み合わせによらず供給電
源容量の範囲内で最大限のエネルギーをロータの加速回
転に付与でき、ロータを短時間で高速に回転させること
ができ、作業能率を向上させる効果がある。According to the present invention, the CPU detects the power supply current of the centrifuge body, and controls the inverter so that the current flowing through the inverter for driving the induction machine becomes a constant value equal to or less than the predetermined value of the power supply current value. Pulse width modulation control, the maximum energy can be applied to the acceleration rotation of the rotor within the range of the power supply capacity regardless of the combination of the centrifuge and the rotor, and the rotor can be rotated at high speed in a short time. It has the effect of improving work efficiency.
【図１】 本発明になる遠心機の制御装置を示す回路図
である。FIG. 1 is a circuit diagram showing a control device of a centrifuge according to the present invention.
【図２】 本発明になる電源電流抑制制御処理を示すフ
ローチャート図である。FIG. 2 is a flowchart illustrating a power supply current suppression control process according to the present invention.
【図３】 ＣＰＵからインバータに出力される出力信号
図である。FIG. 3 is an output signal diagram output from a CPU to an inverter.
【図４】 ロータ加速時の電源電流の様子を表した図で
ある。FIG. 4 is a diagram showing a state of a power supply current at the time of rotor acceleration.
５はインバータ、６は誘導機、１０はＣＰＵ、１１はロ
ータ、１６は電源電流検出回路である。5 is an inverter, 6 is an induction machine, 10 is a CPU, 11 is a rotor, and 16 is a power supply current detection circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 利幸 茨城県ひたちなか市武田1060番地 日立工 機エンジニアリング株式会社内 Ｆターム(参考） 4D057 AD01 CA08 CB04 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiyuki Suzuki 1060 Takeda, Hitachinaka-shi, Ibaraki F-term in Hitachi Koki Engineering Co., Ltd. 4D057 AD01 CA08 CB04
Claims (1)
を駆動するインバータと、該インバータを制御するＣＰ
Ｕと、該誘導機を駆動する時に電源側に流れる電源電流
を測定しそのアナログ値を該ＣＰＵに入力させる電源電
流検出回路とを備えた遠心機の制御装置に於いて、該誘
導機の加速時に該電源電流検出回路により検出された電
源電流値が予め定められた値に達した場合該ＣＰＵによ
り該インバータに対してパルス幅変調制御を行ない該誘
導機を加速させ電源電流値を予め定められた値以下の一
定値に抑制制御させることを特徴とする遠心機の制御装
置。An induction machine for rotating a rotor, an inverter for driving the induction machine, and a CP for controlling the inverter
U and a power supply current detection circuit for measuring a power supply current flowing to a power supply side when the induction machine is driven and inputting an analog value thereof to the CPU. When the power supply current value detected by the power supply current detection circuit reaches a predetermined value, the CPU performs pulse width modulation control on the inverter to accelerate the induction machine and set the power supply current value to a predetermined value. A control device for a centrifuge, wherein the control device performs a suppression control to a constant value equal to or less than a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27780898A JP3744228B2 (en) | 1998-09-30 | 1998-09-30 | Centrifuge control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27780898A JP3744228B2 (en) | 1998-09-30 | 1998-09-30 | Centrifuge control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000107645A true JP2000107645A (en) | 2000-04-18 |
| JP3744228B2 JP3744228B2 (en) | 2006-02-08 |
Family
ID=17588563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27780898A Expired - Fee Related JP3744228B2 (en) | 1998-09-30 | 1998-09-30 | Centrifuge control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3744228B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011056397A (en) * | 2009-09-09 | 2011-03-24 | Hitachi Koki Co Ltd | Operation management system of centrifuge, and centrifuge |
| CN102233304A (en) * | 2010-04-30 | 2011-11-09 | Ls产电株式会社 | Centrifugal separator driving device |
| KR101100546B1 (en) | 2010-04-30 | 2011-12-29 | 엘에스산전 주식회사 | Driving Device of Centrifugal Separator |
| CN105289859A (en) * | 2015-11-27 | 2016-02-03 | 惠州学院 | Control system for top suspension type centrifugal machine |
-
1998
- 1998-09-30 JP JP27780898A patent/JP3744228B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011056397A (en) * | 2009-09-09 | 2011-03-24 | Hitachi Koki Co Ltd | Operation management system of centrifuge, and centrifuge |
| CN102233304A (en) * | 2010-04-30 | 2011-11-09 | Ls产电株式会社 | Centrifugal separator driving device |
| KR101100546B1 (en) | 2010-04-30 | 2011-12-29 | 엘에스산전 주식회사 | Driving Device of Centrifugal Separator |
| CN105289859A (en) * | 2015-11-27 | 2016-02-03 | 惠州学院 | Control system for top suspension type centrifugal machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3744228B2 (en) | 2006-02-08 |
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