JPH0683588B2 - Controller for DC motor without commutator - Google Patents
Controller for DC motor without commutatorInfo
- Publication number
- JPH0683588B2 JPH0683588B2 JP61027192A JP2719286A JPH0683588B2 JP H0683588 B2 JPH0683588 B2 JP H0683588B2 JP 61027192 A JP61027192 A JP 61027192A JP 2719286 A JP2719286 A JP 2719286A JP H0683588 B2 JPH0683588 B2 JP H0683588B2
- Authority
- JP
- Japan
- Prior art keywords
- motor
- frequency
- rectifier
- detecting
- electromotive voltage
- 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
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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
Description
【発明の詳細な説明】 産業上の利用分野 本発明は電機子巻線に誘起される逆起電圧によって磁石
回転子を回転させる無整流子直流電動機の制御装置に関
するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a non-commutator DC motor that rotates a magnet rotor by a back electromotive force induced in an armature winding.
従来の技術 近年、無整流子直流電動機は高効率であることと、回転
数が印加電圧を変えるだけで容易に可変できるというこ
とから様々な方面で使用されている。しかし一般的には
無整流子電動機を半導体スイッチング素子の動作タイミ
ングと時間とを制御して動作させるために、ホール素子
等の位置検出用センサが必要であった。ところが電動圧
縮機のように高温，高圧，オイル等非常に使用環境の悪
いところで、無整流子直流電動機を用いたい場合、位置
検出用センサの信頼性に問題があった。そこで近年、電
機子巻線の逆起電圧から磁石回転子の相対的な位置を検
出し、その信号により半導体スイッチング素子を制御さ
せる方法が種々提案されている。2. Description of the Related Art In recent years, non-rectifier DC motors have been used in various fields because of their high efficiency and the fact that the number of revolutions can be easily changed by changing the applied voltage. However, in general, a position detecting sensor such as a hall element is required to operate the non-rectifier motor by controlling the operation timing and time of the semiconductor switching element. However, when an uncommutated DC motor is desired in a place where the operating environment is extremely bad such as high temperature, high pressure, and oil such as an electric compressor, there is a problem in the reliability of the position detection sensor. Therefore, in recent years, various methods have been proposed in which the relative position of the magnet rotor is detected from the back electromotive force of the armature winding and the semiconductor switching element is controlled by the signal.
以下図面を参照しながら上述した従来の無整流子直流電
動機の制御装置の一例について説明する。An example of the conventional controller for a non-rectifier DC motor described above will be described below with reference to the drawings.
第３図は従来の無整流子直流電動機の制御装置を示すも
のである。１は直流電源、２は６個の半導体スイッチン
グ素子S1〜S6を３相ブリッジ接続して形成した半導体コ
ミュテータ装置である。３は電機子巻線４と磁石回転子
５とを有した無整流子直流電動機である。６は電機子巻
線４の巻線電圧VA〜VCを入力とした逆起電圧検出回路、
７は逆起電圧検出回路６の出力を入力し、半導体コミュ
テータ装置２の半導体スイッチング素子S1〜S6を駆動す
る駆動回路である。８は直流電源１の一端と半導体コミ
ュテータの入力の一端との間に挿入された抵抗器、９は
抵抗器８の両端に生じた電圧により電流を検出する保護
検出回路である。駆動回路７の中には無整流子直流電動
機３の始動，運転，停止の各動作をさせる動作手段7a
と、一定時間T2を発生する第２タイマ手段7bと、逆起電
圧検出回路６の出力の周波数を検出し検出した周波数が
ある周波数より高くなった時信号を発生する周波数検出
手段7cとを具備している。FIG. 3 shows a conventional controller for a DC motor without commutator. Reference numeral 1 is a DC power supply, and 2 is a semiconductor commutator device formed by connecting six semiconductor switching elements S 1 to S 6 in a three-phase bridge connection. Reference numeral 3 is a non-commutator DC electric motor having an armature winding 4 and a magnet rotor 5. 6 is a back electromotive force detection circuit which inputs the winding voltages V A to V C of the armature winding 4,
Reference numeral 7 is a drive circuit which inputs the output of the back electromotive force detection circuit 6 and drives the semiconductor switching elements S 1 to S 6 of the semiconductor commutator device 2. Reference numeral 8 is a resistor inserted between one end of the DC power supply 1 and one end of the input of the semiconductor commutator, and 9 is a protection detection circuit for detecting a current by the voltage generated at both ends of the resistor 8. In the drive circuit 7, an operating means 7a for starting, operating and stopping the commutatorless DC motor 3 is provided.
When a second timer means 7b for generating a predetermined time T 2, and a frequency detection means 7c for generating a signal when a higher than a certain frequency detected detected frequency the frequency of the output of the counter electromotive voltage detection circuit 6 It has.
以上のように構成された無整流子電動機の制御装置につ
いて、以下その動作について説明する。The operation of the control device for a commutatorless motor configured as described above will be described below.
まずモータ停止時には電機子巻線４には逆起電圧が発生
しないため、逆起電圧検出回路６での磁石回転子５の相
対位置を検出できないので、動作手段7aによって、半導
体コミュテータ装置２の半導体スイッチング素子S1〜S6
を制御し電機子巻線４を励磁する。この励磁を順次切り
替えることにより電機子内部には回転磁界が生じる。こ
の回転磁界に同期して磁石回転子５が回転する。回転磁
界の周波数を順次上げる事により磁石回転子５の回転数
を上げることができる。磁石回転子５の回転数が上がり
モータの回転に伴って電機子巻線の逆起電圧が発生し逆
起電圧検出回路６による磁石回転子５の相対位置の検出
ができるようになると次は逆起電圧検出回路６の出力に
より動作手段7aによりモータの回転を継続させる。逆起
電圧検出回路６は電機子巻線４の巻線電圧VA〜VCより逆
起電圧の成分のみを取り磁石回転子５の相対位置を検出
するので、ホール素子等の位置検出用センサを用いたの
と同様に安定した運転が得られる。またモータの停止は
動作手段7aにより半導体コミュテータ装置２の半導体ス
イッチング素子S1〜S6を全てOFFにして停止させる。ま
た抵抗器８の両端に発生する電圧がある一定値を越える
（つまり過電流が流れる）と保護検出回路９から信号を
出し、動作手段7aによりモータを停止させる。また、こ
のように位置検出を逆起電圧で行なう場合、始動を失敗
しモータがロックすることがある。ロックすると電機子
巻線４に発生する逆起電圧0Vとなるので逆起電圧検出回
路６と駆動回路７と半導体コミュテータ装置２との閉ル
ープにおいて動作が行なわれ、電機子巻線４のＬ成分に
より正帰還がかかり閉ループ内部で高い周波数（100Wク
ラスの無整流子電動機で約500Hz以上）で発振する。こ
の発振を周波数検出手段7cにて検出し動作手段7aに信号
を送りモータの動作を停止させる。また保護検出回路９
又は周波数検出手段7cにて動作が停止した場合、第２タ
イマ手段により一定時間T2経過後、モータを再始動させ
る。以上の動作をフローチャートで示すと第４図のよう
になる。10,11で動作手段により始動動作、運転動作を
行う。12で周波数検出手段7cで発振動作の有無を確認す
る。発振していない場合は運転動作11を続け、発振した
場合は動作手段7aにより停止動作13を行いモータを停止
させる。また保護検出回路９が動作した時にも保護動作
14を行い、停止動作13を行う。停止動作13が完了すると
第２タイマ15が動作し時間T2待機する。その後再び始動
動作10からくり返していた。First, when the motor is stopped, a counter electromotive voltage is not generated in the armature winding 4, and therefore the relative position of the magnet rotor 5 in the counter electromotive voltage detection circuit 6 cannot be detected. Switching elements S 1 to S 6
To excite the armature winding 4. A rotating magnetic field is generated inside the armature by sequentially switching this excitation. The magnet rotor 5 rotates in synchronization with this rotating magnetic field. The number of rotations of the magnet rotor 5 can be increased by sequentially increasing the frequency of the rotating magnetic field. When the number of rotations of the magnet rotor 5 increases and a counter electromotive voltage of the armature winding is generated as the motor rotates and the counter electromotive voltage detection circuit 6 becomes able to detect the relative position of the magnet rotor 5, the next reverse occurs. The output of the electromotive voltage detection circuit 6 causes the operating means 7a to continue the rotation of the motor. Since the back electromotive force detection circuit 6 takes only the components of the back electromotive force from the winding voltages V A to V C of the armature winding 4 to detect the relative position of the magnet rotor 5, a position detection sensor such as a hall element is detected. Stable operation can be obtained as in the case of using. The stopping of the motor to all the semiconductor switching elements S 1 to S 6 of the semiconductor commutator device 2 OFF to stop the operation unit 7a. When the voltage generated across the resistor 8 exceeds a certain value (that is, an overcurrent flows), a signal is output from the protection detection circuit 9 and the motor is stopped by the operating means 7a. Further, when the position is detected by the counter electromotive voltage as described above, the start may fail and the motor may be locked. When locked, the back electromotive voltage generated in the armature winding 4 becomes 0 V, so that the back electromotive voltage detection circuit 6, the drive circuit 7, and the semiconductor commutator device 2 operate in a closed loop, and the L component of the armature winding 4 causes the operation. Positive feedback is applied, and it oscillates at a high frequency (about 500 Hz or more in a 100 W class non-rectifier motor) inside the closed loop. This oscillation is detected by the frequency detecting means 7c and a signal is sent to the operating means 7a to stop the operation of the motor. In addition, the protection detection circuit 9
Or when operating at a frequency detector 7c is stopped, after a predetermined time T 2 has elapsed by the second timer means, to restart the motor. The above operation is shown in a flowchart of FIG. At 10, 11, the starting operation and the driving operation are performed by the operating means. At 12, the frequency detecting means 7c confirms the presence or absence of the oscillating operation. When it does not oscillate, the operation operation 11 is continued, and when it oscillates, the operation means 7a performs the stop operation 13 to stop the motor. Also, the protection operation is performed when the protection detection circuit 9 operates.
14 is performed, and stop operation 13 is performed. When the stop operation 13 is completed, the second timer 15 operates and waits for time T 2 . After that, starting operation 10 was repeated again.
発明が解決しようとする問題点 しかしながら上記のような構成では以下のような問題点
があった。始動を失敗しモータがロックした場合、発振
動作を検出した場合、保護動作と同じく停止動作し時間
T2後再始動するようにしているので、始動を失敗した場
合でも長い時間待機しなければ再始動しないため再始動
するのに時間がかかるという問題点を有していた。Problems to be Solved by the Invention However, the above configuration has the following problems. If the start fails and the motor locks, or if an oscillation operation is detected, the stop operation is the same as the protection operation.
Since it is designed to restart after T 2, there is a problem that it takes time to restart even if it fails to start unless it waits for a long time.
本発明は上記問題点に鑑み、始動を失敗した場合は短時
間で再始動するようにした無整流子直流電動機の制御装
置を提供するものである。In view of the above problems, the present invention provides a controller for a non-commutator DC motor that restarts in a short time if the start fails.
問題点を解決するための手段 上記問題点を解決するために本発明の無整流子直流電動
機の制御装置は、逆起電圧検出回路の出力の周波数を検
出し検出した周波数がある周波数よりも高くなった時動
作手段により無整流子直流電動機の動作を停止させる周
波数検出手段と、前記周波数検出手段の動作回数を計数
するＮ進カウント手段と、前記検出手段が動作したのち
所定時間後信号を発生する第１タイマ手段と、前記Ｎ進
カウント手段の出力信号又は保護検出回路の出力信号が
発生したのち所定時間後信号を発生する第２タイマ手段
という構成を備えたものである。Means for Solving the Problems In order to solve the above problems, the controller for the non-rectifier DC motor of the present invention detects the frequency of the output of the counter electromotive voltage detection circuit and detects the detected frequency higher than a certain frequency. Frequency detecting means for stopping the operation of the non-rectifier DC motor by the operating means, N-ary counting means for counting the number of times of operation of the frequency detecting means, and a signal after a predetermined time after the detecting means operates. And a second timer means for generating a signal after a predetermined time has elapsed after the output signal of the N-ary counting means or the output signal of the protection detection circuit is generated.
作用 本発明は上記した構成によって、第１タイマ手段の所定
時間T1と第２タイマ手段の所帯時間T2とをT1≪T2となる
ように設定し、始動を失敗した場合、短時間で再始動す
るようにし、また始動の失敗がＮ回連続でかかった場合
は保護動作と同様に取り扱うようにしたものである。The configuration action present invention described above if a predetermined time T 1 of the first timer means and household time T 2 of the second timer means is set to be T 1 << T 2, failed starting, short When the start failure occurs N times in succession, it is handled in the same manner as the protection operation.
実施例 以下本発明の一実施例の無整流子直流電動機の制御装置
について、図面を参照しながら説明する。Embodiment Hereinafter, a controller for a DC motor without commutator according to an embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例における無整流子直流電動機
の制御装置を示すものである。第１図において１〜９と
7a〜7cは従来例と同一なので説明は省略する。7dは周波
数検出手段7cの動作回数をカウントするＮ進カウント手
段、7eは周波数検出手段7cの動作時に所定時間動作する
第１タイマ手段である。FIG. 1 shows a controller for a DC motor without commutator according to an embodiment of the present invention. 1 to 9 in FIG.
Since 7a to 7c are the same as the conventional example, the description is omitted. Reference numeral 7d is an N-ary counting means for counting the number of operations of the frequency detecting means 7c, and 7e is first timer means for operating for a predetermined time when the frequency detecting means 7c is operating.
以上のように構成された無整流子直流電動機の制御装置
について第１図，第２図を用いてその動作を説明する。The operation of the controller for the non-rectifier DC motor configured as described above will be described with reference to FIGS. 1 and 2.
第２図は第１図における動作のフローチャートを示すも
のである。10,11で動作手段により始動動作、運転動作
を行う。12で周波数検出手段7cで発振動作の有無を確認
する。発振していない場合は運転動作11を続け、発振し
た場合は動作手段7aにより停止動作16を行いモータを停
止させる。Ｎ進カウンタ7dのカウント値のカウントup17
を行い、18にてｎ＝Ｎであるかどうかの判定を行う。ｎ
≠Ｎの場合第１タイマ19が動作し時間T1待機する。その
後再び始動動作10からくり返す。またｎ＝Ｎの場合は従
来例と同じく保護の動作を行う。FIG. 2 shows a flowchart of the operation in FIG. At 10, 11, the starting operation and the driving operation are performed by the operating means. At 12, the frequency detecting means 7c confirms the presence or absence of the oscillating operation. When it does not oscillate, the operation operation 11 is continued, and when it oscillates, the operation means 7a performs the stop operation 16 to stop the motor. Count up 17 of the count value of the N-ary counter 7d
Then, at 18, it is determined whether or not n = N. n
When ≠ N, the first timer 19 operates and waits for time T 1 . After that, the starting operation 10 is repeated again. When n = N, the protection operation is performed as in the conventional example.
以上のように本実施例においては逆起電圧検出回路６の
出力周波数を検出し検出した周波数がある周波数よりも
高くなった時動作手段7aにより停止動作16をさせる周波
数検出手段7cと、周波数検出手段7cの動作回数を計数す
るＮ進カウント手段7dと、周波数検出手段7cが動作した
のち所定時間T1後に信号を発生する第１タイマ手段7e
と、Ｎ進カウント手段7dの出力信号又は保護検出回路９
の出力信号が発生したのち所定時間T2後に信号を発生す
る第２タイマ手段7bを設けることにより、始動を失敗し
た時には短時間で再始動すると共にＮ回始動を失敗した
時には通常の保護と同じ動作をすることができる。As described above, in this embodiment, the output frequency of the counter electromotive voltage detection circuit 6 is detected, and when the detected frequency becomes higher than a certain frequency, the operation means 7a causes the stop operation 16 and the frequency detection means 7c. N-ary counting means 7d for counting the number of operations of the means 7c and first timer means 7e for generating a signal after a predetermined time T 1 after the frequency detecting means 7c is operated.
And the output signal of the N-ary counting means 7d or the protection detection circuit 9
By providing the second timer means 7b for generating a signal after a predetermined time T 2 has elapsed after the output signal of 1 is generated, it is restarted in a short time when the start fails and the same as the normal protection when the start fails N times. Can act.
発明の効果 逆起電圧検出回路の出力の周波数を検出し検出した周波
数がある周波数よりも高くなった時動作手段により無整
流子直流電動機の動作を停止させる周波数検出手段と、
前記周波数検出手段の動作回数を計数するＮ進カウント
手段と、前記検出手段が動作したのち所定時間後信号を
発生する第１タイマ手段と、前記Ｎ進カウント手段の出
力信号又は保護検出回路の出力信号が発生したのち所定
時間後信号を発生する第２タイマ手段とを設けることに
より、無整流子直流電動機の始動を失敗した場合には一
度停止し、その後短時間で再始動をすることができるた
め、速やかな始動が可能となる。またＮ回連続して始動
を失敗した時は異常と判断して保護動作に移ることがで
きる。Advantageous Effects of Invention Frequency detecting means for detecting the frequency of the output of the counter electromotive voltage detecting circuit and stopping the operation of the non-rectifier DC motor by the operating means when the detected frequency becomes higher than a certain frequency,
N-ary counting means for counting the number of operations of the frequency detecting means, first timer means for generating a signal after a predetermined time after the detecting means operates, output signal of the N-ary counting means or output of a protection detection circuit By providing the second timer means for generating a signal after a predetermined time after the signal is generated, if the start of the non-rectifier DC motor fails, it can be stopped once and then restarted in a short time. Therefore, quick start is possible. If the start fails N times in a row, it can be judged as abnormal and the protective operation can be started.
第１図は本発明の実施例における無整流子直流電動機の
制御装置のブロック図、第２図は第１図の動作を説明す
るフローチャート、第３図は従来の無整流子直流電動機
の制御装置のブロック図、第４図は第３図の動作を説明
するフローチャートである。 １……直流電源、２……半導体コミュテータ装置、３…
…無整流子直流電動機、６……逆起電圧検出回路、7a…
…動作手段、7b……第２タイマ手段、7c……周波数検出
手段、7d……Ｎ進カウント手段、7e……第１タイマ手
段、９……保護検出手段。FIG. 1 is a block diagram of a controller for a non-rectifier DC motor according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of FIG. 1, and FIG. 3 is a controller for a conventional non-rectifier DC motor. FIG. 4 is a flowchart for explaining the operation of FIG. 1 ... DC power supply, 2 ... Semiconductor commutator device, 3 ...
... DC motor without commutator, 6 ... Back electromotive force detection circuit, 7a ...
... operating means, 7b ... second timer means, 7c ... frequency detecting means, 7d ... N-ary counting means, 7e ... first timer means, 9 ... protection detecting means.
Claims (1)
個の半導体スイッチング素子を３相ブリッジ接続して形
成した半導体コミュテータ装置と、磁石回転子と、前記
電機子巻線に発生する逆起電圧により前記磁石回転子の
相対位置を検出する逆起電圧検出回路と、前記半導体コ
ミュテータの異常動作を検出し、保護信号を発生させる
保護検出回路と、前記半導体コミュテータ装置の半導体
スイッチング素子を制御し無整流子電動機を動作させる
動作手段と、前記逆起電圧検出回路の出力の周波数を検
出し検出した周波数がある周波数よりも高くなった時前
記動作手段より無整流子直流電動機の動作を停止させる
周波数検出手段と、前記周波数検出手段の動作回数を計
数するＮ進カウント手段と、前記Ｎ進カウント手段のカ
ウント数が所定値より小さい時、時間T1間動作する第１
タイマ手段と、前記Ｎ進カウント手段のカウント数が所
定値の時、時間T2間（T2＞＞T1）動作する第２タイマ手
段とからなり、前記第１タイマ手段又は第２タイマ手段
が動作を完了したとき無整流子直流電動機を再始動させ
てなる無整流子直流電動機の制御装置。1. An armature winding connected to a neutral point and not grounded, 6
A semiconductor commutator device formed by connecting three semiconductor switching elements in a three-phase bridge, a magnet rotor, and a counter electromotive voltage detection for detecting a relative position of the magnet rotor by a counter electromotive voltage generated in the armature winding. A circuit, a protection detection circuit for detecting an abnormal operation of the semiconductor commutator and generating a protection signal, an operating means for controlling a semiconductor switching element of the semiconductor commutator device to operate a non-rectifier motor, and the counter electromotive voltage detection. A frequency detecting means for detecting the frequency of the output of the circuit and stopping the operation of the non-rectifier DC motor by the operating means when the detected frequency becomes higher than a certain frequency, and N for counting the number of times of operation of the frequency detecting means. A first counting unit and a first unit which operates for a time T1 when the count number of the N-th counting unit is smaller than a predetermined value.
The timer means and the second timer means that operates for a time T2 (T2 >> T1) when the count number of the N-ary counting means is a predetermined value, and the first timer means or the second timer means operates. A control device for a non-rectifier DC motor that restarts the non-rectifier DC motor when completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027192A JPH0683588B2 (en) | 1986-02-10 | 1986-02-10 | Controller for DC motor without commutator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61027192A JPH0683588B2 (en) | 1986-02-10 | 1986-02-10 | Controller for DC motor without commutator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62185585A JPS62185585A (en) | 1987-08-13 |
| JPH0683588B2 true JPH0683588B2 (en) | 1994-10-19 |
Family
ID=12214219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61027192A Expired - Lifetime JPH0683588B2 (en) | 1986-02-10 | 1986-02-10 | Controller for DC motor without commutator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0683588B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0746915B2 (en) * | 1988-05-30 | 1995-05-17 | 沖電気工業株式会社 | Motor drive method |
| BR8901539A (en) * | 1989-03-27 | 1990-10-30 | Brasil Compressores Sa | PROCESS AND ELECTRONIC CIRCUIT FOR CONTROLLING CURRENT MOTOR CONTROL WITHOUT BRUSHES |
| JP3123220B2 (en) * | 1992-06-08 | 2001-01-09 | 株式会社明電舎 | Pickup method of PM motor in inverter system |
| JP3244799B2 (en) * | 1992-09-11 | 2002-01-07 | 日本電産株式会社 | Starting method of sensorless multi-phase DC motor |
| JP6903504B2 (en) * | 2017-07-06 | 2021-07-14 | 東芝ライフスタイル株式会社 | Inverter device |
-
1986
- 1986-02-10 JP JP61027192A patent/JPH0683588B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62185585A (en) | 1987-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0787781A (en) | Driving device for dc brushless motor and its conformity identification method | |
| US7560885B2 (en) | Method and apparatus for controlling motor | |
| JPH0683588B2 (en) | Controller for DC motor without commutator | |
| JP2007195313A (en) | Driving device for brushless motors | |
| JPH1084691A (en) | Motor driver | |
| KR0154848B1 (en) | Telegraph starting circuit and its control method | |
| JPH05227785A (en) | Driver for brushless motor | |
| JP3427001B2 (en) | Drive device for brushless motor | |
| KR100282366B1 (en) | How to Drive Sensorless BLDC Motor | |
| JP3627902B2 (en) | Method and apparatus for detecting lock in compressor drive device | |
| WO2005006536A1 (en) | Circuit for parallel driving synchronized motors | |
| JPH0744871B2 (en) | Controller for DC motor without commutator | |
| JP3244799B2 (en) | Starting method of sensorless multi-phase DC motor | |
| JP3298267B2 (en) | Control device for DC brushless motor without position sensor | |
| JP3666945B2 (en) | Motor controller for compressor | |
| JPS62239891A (en) | Control unit of non-commutator dc motor | |
| JPS62118785A (en) | Starter for commutatorless motor | |
| JPH0622588A (en) | Controller for brushless motor | |
| JPH03207289A (en) | Driver for brushless motor | |
| JP3105557B2 (en) | Motor device | |
| JPS631395A (en) | Drive circuit for brushless motor | |
| JPS63194587A (en) | Commutatorless motor | |
| JP3248281B2 (en) | Rotation control method of sensorless multi-phase DC motor | |
| JPH11332188A (en) | Method for detecting fault in induction motor | |
| JP3124398B2 (en) | Rotation control method of sensorless multi-phase DC motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |