JPH0974785A - Speed control method for induction motor - Google Patents

Speed control method for induction motor

Info

Publication number
JPH0974785A
JPH0974785A JP7226911A JP22691195A JPH0974785A JP H0974785 A JPH0974785 A JP H0974785A JP 7226911 A JP7226911 A JP 7226911A JP 22691195 A JP22691195 A JP 22691195A JP H0974785 A JPH0974785 A JP H0974785A
Authority
JP
Japan
Prior art keywords
induction motor
speed
driving
phase difference
frequency
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
Application number
JP7226911A
Other languages
Japanese (ja)
Other versions
JP3512275B2 (en
Inventor
Ikuo Watanabe
郁夫 渡辺
Yasushi Namihana
康司 浪花
Ichii En
一偉 袁
Junichi Tsuchiya
淳一 土屋
Toshihisa Shimizu
敏久 清水
Gunji Kimura
軍司 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oriental Motor Co Ltd
Original Assignee
Oriental Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oriental Motor Co Ltd filed Critical Oriental Motor Co Ltd
Priority to JP22691195A priority Critical patent/JP3512275B2/en
Publication of JPH0974785A publication Critical patent/JPH0974785A/en
Application granted granted Critical
Publication of JP3512275B2 publication Critical patent/JP3512275B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a speed control method, for an induction motor, in which the output frequency of an inverter is controlled without using a speed detector (i.e., without using a rotational-speed detection signal), which can control the driving speed of the induction motor so as to always become an instruction value irrespective of the load of the induction motor and which is low-cost and simple. SOLUTION: In a system which drives an induction motor 1 by using an inverter 2 used to supply a variable frequency output, the phase difference between the driving voltage V and the driving current I of the induction motor 1 is detected, and the information signal [e.g. a value (t) which has converted the phase difference into the time] of the phase difference is input to a microprocessor 5 in which the driving frequency-driving speed characteristic with reference to a change in the load of the induction motor 1 has been stored in advance. Based on it, a driving frequency at which the driving speed of the induction motor 1 becomes an instruction value is computed by the microprocessor 5, and the induction motor 1 is driven at a driving frequency (f) which has been obtained by this computing operation.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、可変周波数出力を
供給するインバータにて駆動される誘導電動機の速度制
御方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control method for an induction motor driven by an inverter that supplies a variable frequency output.

【0002】[0002]

【従来の技術】従来、インバータを使用して誘導電動機
の速度制御を行なう場合には、誘導電動機の回転速度を
検出する度検出器を用いるのが普通である。その理由
は、誘導電動機から得られる回転速度の検出信号と速度
指令回路からの指令信号とを加算した結果に基づいてイ
ンバータの出力周波数を制御することにより、誘導電動
機の速度制御を行うようにしているためである。
2. Description of the Related Art Conventionally, when the speed of an induction motor is controlled by using an inverter, it is usual to use a degree detector for detecting the rotation speed of the induction motor. The reason is that by controlling the output frequency of the inverter based on the result of adding the detection signal of the rotation speed obtained from the induction motor and the command signal from the speed command circuit, the speed of the induction motor is controlled. This is because

【0003】[0003]

【発明が解決しようとする課題】しかしながら、このよ
うな従来の速度制御方法にあっては、高価な速度検出器
を用いる必要がある上に、誘導電動機の回転部分に速度
検出器を取付ける手間を要するという問題点があるのが
実状である。
However, in such a conventional speed control method, it is necessary to use an expensive speed detector, and it is troublesome to mount the speed detector on the rotating portion of the induction motor. The actual situation is that there is a problem of requiring it.

【0004】本発明は、このような問題点を解消するた
めになされたものであて、その目的は、速度検出器を用
いることなく(すなわち、回転速度検出信号を用いるこ
となく)インバータの出力周波数を制御して、誘導電動
機の負荷の如何に拘らず誘導電動機の駆動速度が常に指
令値になるように制御できるような安価で簡単な誘導電
動機の速度制御方法を提供することにある。
The present invention has been made in order to solve such a problem, and an object thereof is to output frequency of an inverter without using a speed detector (that is, without using a rotation speed detection signal). It is an object of the present invention to provide an inexpensive and simple speed control method for an induction motor that can control the drive speed of the induction motor to always be a command value regardless of the load of the induction motor.

【0005】[0005]

【課題を解決するための手段】上述の目的を達成するた
めに、本発明では、可変周波数出力を供給するインバー
タを用いて誘導電動機を駆動する方式において、(a)
前記誘導電動機の駆動電圧と駆動電流との位相差を検
出し、(b) 前記誘導電動機の負荷の変化に対する駆
動周波数−駆動速度特性を予め記憶させておいたマイク
ロプロセッサに前記位相差の情報信号を入力し、(c)
これに基づいて、前記誘導電動機の駆動速度が指令値
になるような駆動周波数を前記マイクロプロセッサで演
算し、(d) この演算で得られた駆動周波数にて前記
誘導電動機を駆動するようにしている。
In order to achieve the above object, the present invention relates to a method of driving an induction motor by using an inverter that supplies a variable frequency output, in which (a)
The phase difference between the drive voltage and the drive current of the induction motor is detected, and (b) the phase difference information signal is stored in the microprocessor in which the drive frequency-drive speed characteristic with respect to the change of the load of the induction motor is stored in advance. Enter (c)
Based on this, the microprocessor calculates a drive frequency at which the drive speed of the induction motor becomes a command value, and (d) the induction motor is driven at the drive frequency obtained by this calculation. There is.

【0006】[0006]

【発明の実施の形態】本発明に係る誘導電動機の速度制
御方法は、次のような手段にて施行される。 (1) 誘導電動機の負荷に対する駆動周波数−駆動速
度特性(すべり特性)を予め測定しておき、これをマイ
クロプロセッサに記憶させておく。 (2) 誘導電動機の駆動電流と駆動電圧(励磁電圧)
を検出し、その位相差を検出する。 (3) 検出した位相差を上述のマイクロプロセッサに
入力し、位相差(時間)−出力周波数特性によりインバ
ータ出力周波数を決定(演算)する。 (4) このようにして決定されたインバータ出力周波
数を誘導電動機に供給することにより、誘導電動機の負
荷によるすべりの分に応じて上昇された周波数にて駆動
する。 このような構成を採用することにより、安価で簡単な速
度制御方法が提供される。
BEST MODE FOR CARRYING OUT THE INVENTION The speed control method for an induction motor according to the present invention is implemented by the following means. (1) The driving frequency-driving speed characteristic (slip characteristic) with respect to the load of the induction motor is measured in advance and stored in the microprocessor. (2) Induction motor drive current and drive voltage (excitation voltage)
Is detected, and the phase difference is detected. (3) The detected phase difference is input to the above-mentioned microprocessor, and the inverter output frequency is determined (calculated) from the phase difference (time) -output frequency characteristic. (4) By supplying the inverter output frequency thus determined to the induction motor, the induction motor is driven at a frequency increased according to the amount of slip due to the load of the induction motor. By adopting such a configuration, an inexpensive and simple speed control method is provided.

【0007】[0007]

【実施例】以下、本発明の一実施例について図1〜図5
を参照して説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG.

【0008】図1は、本発明に係る誘導電動機の速度制
御方法のシステム構成を示すものであって、同図におい
て、1は誘導電動機、2はこの誘導電動機1に駆動電力
を供給するインバータ、3は誘導電動機1の速度制御を
行なう速度制御回路である。本実施例におけるインバー
タ2としてはPWM(パルス幅変調)方式のものが採用
されており、このインバータ2から可変周波数出力が誘
導電動機1に供給されて誘導電動機1が回転駆動される
ように構成されている。
FIG. 1 shows a system configuration of a speed control method for an induction motor according to the present invention. In FIG. 1, 1 is an induction motor, 2 is an inverter for supplying driving power to the induction motor 1, A speed control circuit 3 controls the speed of the induction motor 1. A PWM (Pulse Width Modulation) type inverter is adopted as the inverter 2 in the present embodiment, and a variable frequency output is supplied from the inverter 2 to the induction motor 1 so that the induction motor 1 is rotationally driven. ing.

【0009】また、上述の速度制御回路3は、インバー
タ2から出力される駆動電圧Vと駆動電流Iとの位相差
を検出してその位相差の時間tを出力する位相差検出部
4と、外部から与えられる電動機回転速度の指令値ω及
び前記位相差検出部4から出力される位相差の時間換算
値tに応じてインバータ入力用周波数fを出力するマイ
クロプロセッサ5とで構成されている。なお、図1及び
図3において、CTは誘導電動機1の駆動電流Iを検出
するためのカレントトランスである。
Further, the speed control circuit 3 described above detects the phase difference between the drive voltage V and the drive current I output from the inverter 2 and outputs the phase difference time t, and It is configured by a microprocessor 5 that outputs an inverter input frequency f according to a command value ω of the motor rotation speed given from the outside and a time conversion value t of the phase difference output from the phase difference detection unit 4. 1 and 3, CT is a current transformer for detecting the drive current I of the induction motor 1.

【0010】上述のマイクロプロセッサ5には、図2に
示すような、誘導電動機1の駆動電圧Vと駆動電流Iの
位相差の時間換算値tに対するインバータ出力周波数の
特性(誘導電動機1にかかる負荷を変化させた時にこの
負荷の変化に拘らず誘導電動機1の回転速度を一定にさ
せた場合の位相差に対する駆動周波数の特性,すなわ
ち、負荷の変化に拘らず回転速度を一定にするための駆
動周波数特性)が特性テーブルとして予め記憶されてい
る。なお、この特性テーブルは、速度制御すべき誘導電
動機1について前もって実験にて求めれらたものであ
り、その実験データがマイクロプロセッサ5に入力され
て記憶されている。
In the above-mentioned microprocessor 5, the characteristics of the inverter output frequency with respect to the time conversion value t of the phase difference between the drive voltage V and the drive current I of the induction motor 1 (load applied to the induction motor 1 as shown in FIG. Of the drive frequency with respect to the phase difference when the rotation speed of the induction motor 1 is made constant regardless of the change of the load when changing the load, that is, the drive for keeping the rotation speed constant regardless of the change of the load. (Frequency characteristic) is stored in advance as a characteristic table. It should be noted that this characteristic table is obtained in advance by an experiment for the induction motor 1 whose speed is to be controlled, and the experimental data is input to and stored in the microprocessor 5.

【0011】本実施例では、図2に示すように、誘導電
動機1の回転速度が、300rpm ,600rpm ,900
rpm ,1200rpm のときの位相差(時間)−駆動周波
数特性を測定した。測定に当たっては、負荷を任意に変
化させて行い、各回転速度ごとに数点測定した。そし
て、各測定点を線で結んで、特性曲線を得た。なお、本
実施例では、300rpm 間隔で特性を測定したが、これ
に限らず、必要に応じてもっと小さな間隔で特性の測定
を行ってマイクロプロセッサ5に記憶させることは容易
に可能である。
In the present embodiment, as shown in FIG. 2, the rotation speed of the induction motor 1 is 300 rpm, 600 rpm, 900 rpm.
The phase difference (time) -driving frequency characteristics at rpm and 1200 rpm were measured. In the measurement, the load was arbitrarily changed, and several points were measured for each rotation speed. Then, each measurement point was connected by a line to obtain a characteristic curve. In the present embodiment, the characteristics are measured at intervals of 300 rpm, but the present invention is not limited to this, and it is possible to easily measure the characteristics at smaller intervals and store them in the microprocessor 5.

【0012】次に、本発明の速度制御方法を施行するに
際しての図1のシステムの動作を説明する。まず、誘導
電動機1の駆動電圧Vがインバータ2の内部(CPU)
から検出されると共に、誘導電動機1の駆動電流Iがカ
レントトランスCT(図1及び図3参照)から電圧値と
して検出される。そして、図3に示すように、駆動電流
IはカレントトランスCTによって電圧値として検出さ
れた後に、位相差検出部4内の比較器6に入力されて図
4に示す如きゼロクロス信号P(駆動電流Iがゼロクロ
スする時点に同期する矩形波信号)に変換され、このゼ
ロクロス信号Pが比較器6から駆動電流Iの情報信号と
して出力される。
Next, the operation of the system shown in FIG. 1 when implementing the speed control method of the present invention will be described. First, the drive voltage V of the induction motor 1 is the inside of the inverter 2 (CPU).
The drive current I of the induction motor 1 is detected as a voltage value from the current transformer CT (see FIGS. 1 and 3). Then, as shown in FIG. 3, the drive current I is detected as a voltage value by the current transformer CT, and then input to the comparator 6 in the phase difference detection unit 4 so that the zero cross signal P (drive current) as shown in FIG. I is converted into a rectangular wave signal synchronized with the time point of zero crossing), and the zero crossing signal P is output from the comparator 6 as an information signal of the drive current I.

【0013】そして、上述の駆動電圧Vと駆動電流Iと
の位相差の検出は、位相差検出部4内のタイマ7(図5
参照)にて行われる。すなわち、駆動電圧Vと駆動電流
Iの位相差の検出は、ソフトウェアにて構成されたタイ
マ7に、駆動電圧V及び駆動電流Iのゼロクロス信号を
順次入力して、その時間差をとることによって行われ
る。具体的には、図5に示すように、駆動電圧Vのゼロ
クロス信号(Vゼロクロス信号)に基づいてタイマ7が
起動し、かつ、駆動電流Iのゼロクロス信号P(Iゼロ
クロス信号)に基づいてタイマ7が停止するように設定
しておくことにより、駆動電圧Vと駆動電流Iのゼロク
ロス点の時間差が検出される。従って、本実施例におい
ては、駆動電圧Vと駆動電流Iの位相差は、実際にはゼ
ロクロス点の時間差として換算されて検出されることと
なる。
The detection of the phase difference between the drive voltage V and the drive current I is performed by the timer 7 (see FIG. 5) in the phase difference detecting section 4.
See). That is, the phase difference between the drive voltage V and the drive current I is detected by sequentially inputting the zero-cross signal of the drive voltage V and the drive current I to the timer 7 configured by software and taking the time difference. . Specifically, as shown in FIG. 5, the timer 7 is started based on the zero-cross signal (V zero-cross signal) of the drive voltage V, and the timer 7 is started based on the zero-cross signal P (I zero-cross signal) of the drive current I. By setting 7 to stop, the time difference between the zero cross points of the drive voltage V and the drive current I is detected. Therefore, in the present embodiment, the phase difference between the drive voltage V and the drive current I is actually converted and detected as the time difference at the zero cross point.

【0014】このようにして検出された駆動電圧Vと駆
動電流Iの位相差(時間差)は、前記マイクロプロセッ
サ5にフィードバック信号として入力される。このマイ
クロプロセッサ5においては、上述の位相差と、予め記
憶されている位相差−駆動周波数特性とに基づいて、誘
導電動機1の回転速度が負荷の大きさの如何に拘らず常
に指令値ωとなるようなインバータ入力周波数fが演算
される。この演算により決定されたインバータ入力周波
数fは、周波数指令値としてマイクロプロセッサ5から
インバータ2に出力され、これに伴いPWM方式のイン
バータ2から誘導電動機1に当該周波数fに相当する周
波数の励磁電圧が供給されて回転駆動される。
The phase difference (time difference) between the drive voltage V and the drive current I thus detected is input to the microprocessor 5 as a feedback signal. In the microprocessor 5, the rotational speed of the induction motor 1 is always the command value ω regardless of the magnitude of the load, based on the above-mentioned phase difference and the phase difference-driving frequency characteristic stored in advance. The inverter input frequency f is calculated as follows. The inverter input frequency f determined by this calculation is output from the microprocessor 5 to the inverter 2 as a frequency command value, and along with this, the exciting voltage of the frequency corresponding to the frequency f is applied from the PWM inverter 2 to the induction motor 1. It is supplied and driven to rotate.

【0015】このような構成の速度制御方法によれば、
誘導電動機1に負荷が加わって負荷が大きくなった場合
には、回転数の低下を補うようにインバータ2の出力周
波数がブースト(上昇)せしめられることとなり、これ
により誘導電動機1は指令値ωにて指令された所定速度
になるよう定速制御することができる。なお、本実施例
のような制御を行わない場合には、誘導電動機1に負荷
が加わって負荷が大きくなるのに伴い、すべりが増えて
(位相差が大きくなって)回転速度が低下してしまうこ
ととなる。
According to the speed control method having such a configuration,
When a load is added to the induction motor 1 to increase the load, the output frequency of the inverter 2 is boosted (increased) so as to compensate for the decrease in the rotation speed, which causes the induction motor 1 to reach the command value ω. It is possible to perform constant speed control so that the predetermined speed instructed is obtained. In the case where the control as in this embodiment is not performed, the slip is increased (the phase difference is increased) and the rotation speed is decreased as the load is increased on the induction motor 1 and the load is increased. It will end up.

【0016】以上、本発明の一実施例につき述べたが、
本発明はこの実施例に限定されるものではなく、本発明
の技術的思想に基づいて各種の変形及び変更が可能であ
る。例えば、既述の実施例では、誘導電動機1の駆動電
圧Vをインバータ2の内部(CPU)から検出するよう
にしたが、誘導電動機1の側から検出するようにしても
良い。また、既述の実施例では矩形波から成るゼロクロ
ス信号Pをタイマ7に入力するようにしたが、この矩形
波をトリガ信号に変換したものをゼロクロス信号として
タイマ7に入力するようにしても良い。また、速度制御
回路3は、インバータ2に取り込むことも可能である。
さらに、インバータ2はPWM方式に限るものではな
く、他の方式のものを用いても良い。
As described above, one embodiment of the present invention has been described.
The present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention. For example, in the above-described embodiment, the drive voltage V of the induction motor 1 is detected from the inside (CPU) of the inverter 2, but it may be detected from the induction motor 1 side. Further, in the above-described embodiment, the zero-cross signal P having a rectangular wave is input to the timer 7, but the rectangular wave converted into a trigger signal may be input to the timer 7 as a zero-cross signal. . Further, the speed control circuit 3 can be incorporated in the inverter 2.
Further, the inverter 2 is not limited to the PWM type, and another type may be used.

【0017】[0017]

【発明の効果】以上の如く、本発明は、可変周波数出力
を供給するインバータを用いて誘導電動機を駆動する方
式において、前記誘導電動機の駆動電圧と駆動電流との
位相差を検出し、前記誘導電動機の負荷の変化に対する
駆動周波数−駆動速度特性を予め記憶させておいたマイ
クロプロセッサに前記位相差の値を入力し、これに基づ
いて、前記誘導電動機の駆動速度が指令値になるような
駆動周波数を前記マイクロプロセッサで演算し、この演
算で得られた駆動周波数にて前記誘導電動機を駆動する
ようにしたものであるから、従来用いていたような速度
検出器を使用することなく簡単な手段にて、誘導電動機
を指令値の通りに一定速度で定速運転させることができ
る。すなわち、誘導電動機の負荷が変化した場合にも、
この負荷の大きさの如何に拘らず、所定の回転速度で回
転駆動させることができる。
As described above, the present invention detects the phase difference between the drive voltage and the drive current of the induction motor in the method of driving the induction motor using the inverter that supplies the variable frequency output, and The phase difference value is input to the microprocessor in which the drive frequency-drive speed characteristics with respect to changes in the load of the electric motor are stored in advance, and based on this, the drive speed of the induction motor becomes a command value. Since the frequency is calculated by the microprocessor and the induction motor is driven by the driving frequency obtained by this calculation, a simple means without using a speed detector which is conventionally used. At, the induction motor can be operated at a constant speed at a constant speed according to the command value. That is, even when the load of the induction motor changes,
Regardless of the magnitude of this load, it can be driven to rotate at a predetermined rotation speed.

【0018】また、本発明によれば、上述のように高価
な速度検出器を用いる必要がないのでコストの低減を図
ることができると共に、速度検出器を誘導電動機の回転
部分に取付ける作業も不要となるので速度検出器を取付
ける手間を省くことができるという利点がある。
Further, according to the present invention, since it is not necessary to use an expensive speed detector as described above, the cost can be reduced, and the work of attaching the speed detector to the rotating portion of the induction motor is unnecessary. Therefore, there is an advantage that the labor for mounting the speed detector can be saved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係る誘導電動機の速度制御方法を施行
するシステムの構成を示す構成図である。
FIG. 1 is a configuration diagram showing a configuration of a system for implementing a speed control method for an induction motor according to the present invention.

【図2】上述のシステムのマイクロプロセッサに予め記
憶される位相差−駆動周波数特性を示す特性図である。
FIG. 2 is a characteristic diagram showing a phase difference-driving frequency characteristic stored in advance in a microprocessor of the above system.

【図3】上述のシステムにおいて誘導電動機の駆動電流
を検出する手段を示す回路図である。
FIG. 3 is a circuit diagram showing means for detecting a drive current of the induction motor in the above system.

【図4】駆動電流のゼロクロス信号を示す波形図であ
る。
FIG. 4 is a waveform diagram showing a zero-cross signal of a drive current.

【図5】上述のシステムにおいて誘導電動機の駆動電圧
と駆動電流の位相差を検出する手段を示すブロック図で
ある。
FIG. 5 is a block diagram showing means for detecting a phase difference between a drive voltage and a drive current of the induction motor in the above system.

【符号の説明】[Explanation of symbols]

1 誘導電動機 2 インバータ 3 速度制御回路 4 位相差検出部 5 マイクロプロセッサ 6 比較器 7 タイマ V 駆動電圧 I 駆動電流 CT カレントトランス 1 Induction Motor 2 Inverter 3 Speed Control Circuit 4 Phase Difference Detector 5 Microprocessor 6 Comparator 7 Timer V Drive Voltage I Drive Current CT Current Transformer

───────────────────────────────────────────────────── フロントページの続き (72)発明者 土屋 淳一 東京都八王子市南大沢4−43−2 (72)発明者 清水 敏久 東京都多摩市関戸4丁目11番地の7 (72)発明者 木村 軍司 東京都多摩市鶴牧3丁目14番地3−2 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Tsuchiya 4-43-2 Minamiosawa, Hachioji, Tokyo (72) Inventor Toshihisa Shimizu 4-11-11 Sekito, Tama-shi, Tokyo (72) Inventor Gunji Kimura Tokyo 3-2 Tsurumaki 3-14, Tama City

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 可変周波数出力を供給するインバータを
用いて誘導電動機を駆動する方式において、 (a) 前記誘導電動機の駆動電圧と駆動電流との位相
差を検出し、 (b) 前記誘導電動機の負荷の変化に対する駆動周波
数−駆動速度特性を予め記憶させておいたマイクロプロ
セッサに前記位相差の情報信号を入力し、 (c) これに基づいて、前記誘導電動機の駆動速度が
指令値になるような駆動周波数を前記マイクロプロセッ
サで演算し、 (d) この演算で得られた駆動周波数にて前記誘導電
動機を駆動するようにしたことを特徴とする誘導電動機
の速度制御方法。
1. A method of driving an induction motor using an inverter that supplies a variable frequency output, comprising: (a) detecting a phase difference between a drive voltage and a drive current of the induction motor; The phase difference information signal is input to a microprocessor in which driving frequency-driving speed characteristics with respect to changes in load are stored in advance. (C) Based on this, the driving speed of the induction motor becomes a command value. A driving frequency is controlled by the microprocessor, and (d) the induction motor is driven at the driving frequency obtained by the calculation.
JP22691195A 1995-09-05 1995-09-05 Induction motor speed control method Expired - Fee Related JP3512275B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22691195A JP3512275B2 (en) 1995-09-05 1995-09-05 Induction motor speed control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22691195A JP3512275B2 (en) 1995-09-05 1995-09-05 Induction motor speed control method

Publications (2)

Publication Number Publication Date
JPH0974785A true JPH0974785A (en) 1997-03-18
JP3512275B2 JP3512275B2 (en) 2004-03-29

Family

ID=16852538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22691195A Expired - Fee Related JP3512275B2 (en) 1995-09-05 1995-09-05 Induction motor speed control method

Country Status (1)

Country Link
JP (1) JP3512275B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102843092A (en) * 2012-09-26 2012-12-26 佛山市顺德区和而泰电子科技有限公司 Driving method for preventing resonance of variable frequency motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102843092A (en) * 2012-09-26 2012-12-26 佛山市顺德区和而泰电子科技有限公司 Driving method for preventing resonance of variable frequency motor

Also Published As

Publication number Publication date
JP3512275B2 (en) 2004-03-29

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