JPS61196779A - Controller of motor driven injection molding machine - Google Patents
Controller of motor driven injection molding machineInfo
- Publication number
- JPS61196779A JPS61196779A JP60035388A JP3538885A JPS61196779A JP S61196779 A JPS61196779 A JP S61196779A JP 60035388 A JP60035388 A JP 60035388A JP 3538885 A JP3538885 A JP 3538885A JP S61196779 A JPS61196779 A JP S61196779A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- electric motor
- magnetic field
- temperature
- injection molding
- 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.)
- Pending
Links
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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/16—Controlling the angular speed of one shaft
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、電動式射出成形機の制御装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a control device for an electric injection molding machine.
（ロ）従来の技術
電動式射出成形機は、型開閉、型締、射出、可塑化、突
出しなどの射出成形の各工程を可変速型電動機の速度及
びトルクを制御することにより行わせるようにしたもの
である。電動機の回転運動を直線運動に変換するために
ポールねじ機構などが使用される。電動式射出成形機と
しては、１台の電動機を用いたものと、複数の電動機を
用いたものとがある。１台のみの電動機を用いたものは
、これに複数の電磁クラッチ、電磁ブレーキなどを組合
せて順次各工程の動作を行わせる。複数の電動機を用い
たものは各工程用にそれぞれ電動機が設けられており、
独立に各動作を行わせることができる。(b) Conventional technology Electric injection molding machines perform each injection molding process, such as mold opening/closing, mold clamping, injection, plasticization, and ejection, by controlling the speed and torque of a variable speed electric motor. This is what I did. A pole screw mechanism or the like is used to convert the rotational motion of the electric motor into linear motion. There are two types of electric injection molding machines: those using one electric motor and those using multiple electric motors. If only one electric motor is used, it is combined with a plurality of electromagnetic clutches, electromagnetic brakes, etc. to sequentially operate each process. Products that use multiple electric motors have one electric motor for each process.
Each operation can be performed independently.
（パ）発明が解決し十うとする問題点
しかし、従来の電動式射出成形機には、電動機の温度あ
変化によってそのトルクが変動し、各工程の動作の安定
性が損なわれるという問題点がある。すなわち、停止状
態にあって温度が低下している電動機を始動すると、電
動機の温度が上昇を開始し、所定時間後、例えば２０〜
３０分後に定常温度に達するが、この温度変化によって
電動機のトルクが低下する。側光ば、射出動作を行わせ
る電動機の場合、運転開始時に射出力及び保圧力を所定
の条件に設定しても、電動機が定常温度に達すると電動
機の巻き線の温度、永久磁石の温度などの上昇により、
電動機のトルクが低下し、これにより射出力及び保圧力
が最初の設定値よりも低下ｆることになる。このため、
いわゆる「ショートショット」、「ひけ」なとの成形不
良を発生することになる。これを防止するためには成形
条件を再設定し直す必要がある。また、他の工程用の電
動機においても同様のトルクの低下が発生し、再設定が
必要となる場合がある。本発明は、上記のような問題点
を解決することを目的としている。(P) Problems to be solved by the invention However, conventional electric injection molding machines have the problem that the torque of the electric motor fluctuates due to changes in the temperature of the electric motor, impairing the stability of operation in each process. be. That is, when an electric motor that is in a stopped state and whose temperature has decreased is started, the temperature of the electric motor starts to increase, and after a predetermined period of time, for example,
Although a steady temperature is reached after 30 minutes, the torque of the motor decreases due to this temperature change. In the case of a motor that performs an injection operation, even if the injection force and holding force are set to predetermined conditions at the start of operation, when the motor reaches a steady temperature, the temperature of the motor windings, permanent magnet temperature, etc. Due to the rise in
The torque of the electric motor decreases, and as a result, the injection force and holding force become lower than their initial set values. For this reason,
Molding defects such as so-called "short shots" and "sinks" will occur. In order to prevent this, it is necessary to reset the molding conditions. Furthermore, a similar decrease in torque may occur in electric motors for other processes, and resetting may be required. The present invention aims to solve the above problems.
（ニ）問題点を解決するための手段
電動機の温度上昇に伴なうトルクの低下を補正すること
により、上記問題点を解決する。すなわち、第１の発明
による電動式射出成形機の制御装置は、電動機の磁界の
強さを検知可能な磁気検知器と、磁気検知器によって検
知される電動機の磁界の強さがあらかじめ設定された設
定値と一致するように電動機への供給電力を制御する制
御器と、を有している。(d) Means for solving the problem The above problem is solved by correcting the decrease in torque due to the rise in temperature of the electric motor. That is, the control device for an electric injection molding machine according to the first invention includes a magnetic detector capable of detecting the strength of the magnetic field of the electric motor, and the strength of the magnetic field of the electric motor detected by the magnetic detector is set in advance. and a controller that controls the power supplied to the electric motor so as to match the set value.
また、第２の発明の電動式射出成形機の制御装置は、電
動機の温度を検知可能な温度検知器と、温度検知器によ
って検知された信号から電動機の磁界の強さに対応する
信号を演算する演算器と、演算器によって演算される電
動機の磁界の強さに対応する信号があら′かじめ設定さ
れｆ設定値と一致する′よう電動機への供給電力を制御
する制御器とを有している。Further, the control device for an electric injection molding machine of the second invention includes a temperature detector capable of detecting the temperature of the electric motor, and calculates a signal corresponding to the strength of the magnetic field of the electric motor from the signal detected by the temperature detector. and a controller that controls the power supplied to the motor so that the signal corresponding to the strength of the magnetic field of the motor calculated by the calculator is set in advance and matches the f setting value. ing.
（ホ）作用
成形条件などを設定し、運転を開始すると、電動機の電
気抵抗熱、機械的摩擦熱などにより電動機の温度が次第
に上昇してくる。第１の発明・の場合には、電動機の発
生磁界の強さは磁気検知器によって検知され、その検知
信号は制御器に入力されてあらかじめ設定された設定値
と比較される。(e) Operation When the molding conditions etc. are set and operation is started, the temperature of the motor gradually rises due to the electric resistance heat, mechanical friction heat, etc. of the motor. In the case of the first invention, the strength of the magnetic field generated by the electric motor is detected by a magnetic detector, and the detection signal is input to the controller and compared with a preset value.
この設定値は、運動開始時に条件設定を行ったときの磁
界の強さくこれはトルクに対応している）に対応する値
である。制御器ではこの検知信号と設定値との偏差に応
じて電動機へ供給する電力を増大し、温度変化に、伴な
う磁界の強さの低下を補正する。これにより、電動機の
磁界の強さは常に一定となり、運転開始時の条件を維持
することができる。従って、射出成形の各工程の動作を
安定した状態で行わせることができる。複数の電動機を
有する電動射出成形機の場合には、各電動機について上
記の制御を行う。 ゛
第２の発明の場合には、温度検知器によ駅て電動機の温
度を検知する。電動機の温度と磁界の強さとは一定の関
係にあるため、温度から磁界の強さに対応する信号を演
算することができる（なお、この演算には記憶装置に記
憶させである温度と・磁界との関係から磁界の強さに対
応する信号などを検索、することも含まれる）。この演
算を行った演算器からの信号に基づいて第１の発明の場
合と同様に電、動機への供給電力を制御することができ
る。This set value corresponds to the strength of the magnetic field (which corresponds to the torque) when the conditions were set at the start of the movement. The controller increases the power supplied to the motor according to the deviation between this detection signal and the set value, thereby compensating for the decrease in magnetic field strength that accompanies temperature changes. As a result, the strength of the magnetic field of the motor is always constant, and the conditions at the start of operation can be maintained. Therefore, each step of injection molding can be performed in a stable manner. In the case of an electric injection molding machine having a plurality of electric motors, the above control is performed for each electric motor. In the case of the second invention, the temperature of the electric motor is detected using a temperature detector. Since there is a fixed relationship between the temperature of the electric motor and the strength of the magnetic field, it is possible to calculate a signal corresponding to the strength of the magnetic field from the temperature. (This also includes searching for signals that correspond to the strength of the magnetic field based on the relationship with the Based on the signal from the arithmetic unit that has performed this calculation, it is possible to control the power supplied to the electric motor and the motor, as in the case of the first invention.
（へ）、実施例
第１図に第１の発明の実施例を示す。加熱シリンダ１０
内にスクリュー１２が装入されており、スクリュー１２
は加熱シリンダ１０と一体に設けられるハウジング１４
内の可動部材１６と連結されている。可動部材１６はハ
ウジング１４内のガイド軸１８によって案内されて軸方
向に移動可能である。可動部材１６にはナツト部材２０
が固着されており、このナツト部材２０はめねじを有し
ており、これとかみ合ってポールねじ機構を形成するお
ねじを有するねじ軸２２がナツ、ト部材２０と組合され
ている。ねじ軸２２は可変速型の電動機２４と連結され
ている。電動機２４は電動機制御装置２８によって作動
する駆動回路３０からの電流によって制御される。電動
機制御装置２８の一部を構成する制御器２９には電動機
２４に設けられた磁気検知器３２からの信号が入力され
る。Embodiment FIG. 1 shows an embodiment of the first invention. heating cylinder 10
A screw 12 is inserted inside the screw 12.
is a housing 14 provided integrally with the heating cylinder 10;
It is connected to the movable member 16 inside. The movable member 16 is guided by a guide shaft 18 within the housing 14 and is movable in the axial direction. A nut member 20 is attached to the movable member 16.
The nut member 20 has a female thread, and the nut member 20 is combined with a threaded shaft 22 having a male thread that engages with the female thread to form a pole screw mechanism. The screw shaft 22 is connected to a variable speed electric motor 24. Motor 24 is controlled by current from a drive circuit 30 operated by motor controller 28 . A signal from a magnetic detector 32 provided in the motor 24 is input to a controller 29 that constitutes a part of the motor control device 28 .
磁気検知器３２は、例えば電動機２４の磁性体部に設け
られる。The magnetic detector 32 is provided, for example, in a magnetic body portion of the electric motor 24.
成形条件を設定して運転を開始すると、電気的抵抗熱、
機械的摩擦熱などにより電動機２４の温度が上昇し始め
る。温度が上昇すると電動機２４の磁界の強さが低下す
る。電動機２４の磁界の強さは磁気検知器３２によって
検知され、制御器２９に送信される。制御器２９は磁気
検知器３２からの信号に基づいてフィードバック制御を
行う。When you set the molding conditions and start operation, electrical resistance heat,
The temperature of the electric motor 24 begins to rise due to mechanical frictional heat and the like. As the temperature increases, the strength of the magnetic field of the motor 24 decreases. The strength of the magnetic field of the electric motor 24 is detected by a magnetic detector 32 and transmitted to the controller 29 . The controller 29 performs feedback control based on the signal from the magnetic detector 32.
すなわち、磁気検知器３２からの信号を所定の設定値と
比較し、両者の偏差を解消するように信号を出力する。That is, the signal from the magnetic detector 32 is compared with a predetermined set value, and a signal is output so as to eliminate the deviation between the two.
これにより電動機制御装置２８は駆動回路３０に電流を
増大するように指令し、これにより電動機２４への電流
が増大する。なお、上記設定値は最初に成形条件を設定
したときの磁界の強さに対応する値である。これにより
電動Ｉａ２４は最初の設定どおりの磁界の強さ、すなわ
ちトルクを維持することができる。従って、電動機２．
４の温度変化にかかわらず当初の成形条件のままで運転
を行うことができる。なお、この実施例では本発明に直
接関連する部分のみを示しであるが、実際には電動機２
４の回転速度は例えばパルス発生器によって検出され、
各動作に応じて所定の回転速度となるように制御される
。また、この実施例では射出用の電動機２４の制御につ
いてのみ示したが、その他の複数の電動機についても同
様の制御を行うことができる。This causes motor controller 28 to command drive circuit 30 to increase the current, which increases the current to motor 24. Note that the above set value is a value corresponding to the strength of the magnetic field when the molding conditions are initially set. Thereby, the electric motor Ia24 can maintain the strength of the magnetic field, that is, the torque as originally set. Therefore, electric motor 2.
Regardless of the temperature change in step 4, operation can be performed under the original molding conditions. Note that in this embodiment, only the parts directly related to the present invention are shown, but in reality, the electric motor 2
The rotational speed of 4 is detected, for example, by a pulse generator,
The rotational speed is controlled to a predetermined rotational speed according to each operation. Further, although this embodiment shows only the control of the injection motor 24, similar control can be performed for other plurality of motors.
第２図に第２の発明の実施例を示す。この実施例では電
動機２４に温度検知器３４が設けてあり、温度検知器３
４の信号は演算器３６に入力され、演算器３６で処理さ
れた信号が制御器２９に入力される。演算器３６では、
温度検知器３４からの温度に対応する信号を磁界の強さ
に対応する信号（すなわち、電動機のトルクに対応する
信号）に変換する演算を行う。電動機２４の温度の上昇
と、これに伴う磁界の強さの低下との間には一定の関係
があるため、上記のような演算を行うことができる。従
って、制御器２９には電動機２４の磁界の強さに対応す
る信号が入力される。制御器２９では前述の第１の発明
と同様にして電動機２４への供給電流の制御が行われる
。これにより、第１の発明と同様に、電動機２４は最初
の設定どおりの磁界の強さ、すなわちトルクを維持する
ことができる。FIG. 2 shows an embodiment of the second invention. In this embodiment, the electric motor 24 is provided with a temperature detector 34.
The signal No. 4 is input to the arithmetic unit 36, and the signal processed by the arithmetic unit 36 is input to the controller 29. In the computing unit 36,
An operation is performed to convert a signal corresponding to the temperature from the temperature sensor 34 into a signal corresponding to the strength of the magnetic field (that is, a signal corresponding to the torque of the electric motor). Since there is a certain relationship between an increase in the temperature of the electric motor 24 and a corresponding decrease in the strength of the magnetic field, the above calculation can be performed. Therefore, a signal corresponding to the strength of the magnetic field of the electric motor 24 is input to the controller 29. The controller 29 controls the current supplied to the electric motor 24 in the same manner as in the first aspect of the invention. As a result, the electric motor 24 can maintain the magnetic field strength, that is, the torque, as originally set, similarly to the first invention.
（ト）発明の詳細
な説明してきたように、電動機の温度変化に伴なうトル
クの変動を磁界又は温度を検出することにより補正する
ようにしたので、電動機のトルクを常に所定どおりに制
御することが可能となり、初期の条件設定を変更するこ
となく常に安定した状態で精密な成形が可能となる。(G) As explained in detail about the invention, since torque fluctuations caused by temperature changes in the electric motor are corrected by detecting the magnetic field or temperature, the torque of the electric motor can always be controlled as specified. This makes it possible to perform precise molding in a stable state at all times without changing the initial condition settings.
第１図は第１の発明の実施例を示す図、第２図は第２の
発明の実施例を示す図である。
２４・・・電動機、２９・・・制御器、３０・・・駆動
回路、３２・・・磁気検知器、３４・・・温度検知器、
３６・・・演算器。FIG. 1 is a diagram showing an embodiment of the first invention, and FIG. 2 is a diagram showing an embodiment of the second invention. 24... Electric motor, 29... Controller, 30... Drive circuit, 32... Magnetic detector, 34... Temperature detector,
36... Arithmetic unit.
Claims (1)
いる電動式射出成形機の制御装置において、 電動機の磁界の強さを検知可能な磁気検知器と、磁気検
知器によって検知される電動機の磁界の強さがあらかじ
め設定された設定値と一致するように電動機への供給電
力を制御する制御器と、を有することを特徴とする電動
式射出成形機の制御装置。 ２、射出成形の各工程の動作の駆動源として電動機を用
いる電動式射出成形機の制御装置において、 電動機の温度を検知可能な温度検知器と、温度検知器に
よって検知された信号から電動機の磁界の強さに対応す
る信号を演算する演算器と、演算器によって演算される
電動機の磁界の強さに対応する信号があらかじめ設定さ
れた設定値と一致するよう電動機への供給電力を制御す
る制御器とを有することを特徴とする電動式射出成形機
の制御装置。[Claims] 1. In a control device for an electric injection molding machine that uses an electric motor as a driving source for operation of each injection molding process, a magnetic detector capable of detecting the strength of the magnetic field of the electric motor; 1. A control device for an electric injection molding machine, comprising: a controller that controls power supplied to the electric motor so that the strength of the magnetic field of the electric motor detected by the electric motor matches a preset setting value. 2. In a control device for an electric injection molding machine that uses an electric motor as the drive source for operation of each injection molding process, there is a temperature sensor that can detect the temperature of the electric motor, and a signal detected by the temperature sensor that detects the magnetic field of the electric motor. a calculator that calculates a signal corresponding to the strength of the magnetic field of the motor, and a control that controls the power supplied to the motor so that the signal calculated by the calculator that corresponds to the strength of the motor's magnetic field matches a preset value. 1. A control device for an electric injection molding machine, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60035388A JPS61196779A (en) | 1985-02-26 | 1985-02-26 | Controller of motor driven injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60035388A JPS61196779A (en) | 1985-02-26 | 1985-02-26 | Controller of motor driven injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61196779A true JPS61196779A (en) | 1986-08-30 |
Family
ID=12440523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60035388A Pending JPS61196779A (en) | 1985-02-26 | 1985-02-26 | Controller of motor driven injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61196779A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02273094A (en) * | 1989-04-13 | 1990-11-07 | Zexel Corp | Blower motor controller for vehicle |
| JPH06170909A (en) * | 1992-12-02 | 1994-06-21 | Nissei Plastics Ind Co | Control device of servomotor |
| EP1563982A1 (en) * | 2004-02-17 | 2005-08-17 | Fanuc Ltd | Load determining device for an electrically-operated injection moliding machine |
| WO2022224755A1 (en) * | 2021-04-23 | 2022-10-27 | 株式会社デンソー | Drive member control device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51127773A (en) * | 1975-04-14 | 1976-11-08 | Gen Electric | Circuit for measuring actual torque |
| JPS5755035A (en) * | 1980-09-19 | 1982-04-01 | Hitachi Ltd | Magnetron anode structure |
-
1985
- 1985-02-26 JP JP60035388A patent/JPS61196779A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51127773A (en) * | 1975-04-14 | 1976-11-08 | Gen Electric | Circuit for measuring actual torque |
| JPS5755035A (en) * | 1980-09-19 | 1982-04-01 | Hitachi Ltd | Magnetron anode structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02273094A (en) * | 1989-04-13 | 1990-11-07 | Zexel Corp | Blower motor controller for vehicle |
| JPH06170909A (en) * | 1992-12-02 | 1994-06-21 | Nissei Plastics Ind Co | Control device of servomotor |
| EP1563982A1 (en) * | 2004-02-17 | 2005-08-17 | Fanuc Ltd | Load determining device for an electrically-operated injection moliding machine |
| US7287971B2 (en) | 2004-02-17 | 2007-10-30 | Fanuc Ltd | Load determining device for an electrically-operated injection molding machine |
| WO2022224755A1 (en) * | 2021-04-23 | 2022-10-27 | 株式会社デンソー | Drive member control device |
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