JPH1146493A - Controller for compressor driving motor - Google Patents

Controller for compressor driving motor

Info

Publication number
JPH1146493A
JPH1146493A JP9199886A JP19988697A JPH1146493A JP H1146493 A JPH1146493 A JP H1146493A JP 9199886 A JP9199886 A JP 9199886A JP 19988697 A JP19988697 A JP 19988697A JP H1146493 A JPH1146493 A JP H1146493A
Authority
JP
Japan
Prior art keywords
operation mode
duty ratio
signal
forced commutation
rotor position
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
Application number
JP9199886A
Other languages
Japanese (ja)
Inventor
Tadayuki Igarashi
唯 之 五十嵐
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP9199886A priority Critical patent/JPH1146493A/en
Publication of JPH1146493A publication Critical patent/JPH1146493A/en
Pending legal-status Critical Current

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  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent breakdown in a semiconductor switching element group even if starting control is exercised when a compressor is in anomaly state such as locking, by including a forced communication operation mode with fixed duty ratio in which the duty ratio of PWM signals is fixed in forced commutation operation mode, for a specified time after start of the compressor. SOLUTION: In forced commutation operation mode in starting, when a speed command signal is inputted, a speed controlling means 8 compares the speed command signal with the actual speed from the output signal from a counting means 7, and starts output of a duty ratio command signal corresponding to the deviation. When a timer means 15 which is fed with the signal is brought into a starting state, the timer means 15 provides a start judging means 9 and a duty ratio command means 13 with a starting signal for a given time. In response thereto, an operation mode changing means 10 provides a driving signal generating means 12 with a preset forced commutation signal from a forced commutation signal generating means 11 instead of an output signal from the counting means 7, and a pulse width modulating means 14 with a duty ratio command signal for starting from the duty ratio command means 13 for the given time.

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、圧縮機を駆動する
ブラシレスモータを制御する圧縮機駆動電動機の制御装
置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor driving motor control device for controlling a brushless motor for driving a compressor.

【0002】[0002]

【従来の技術】通常ブラシレスモータには、その磁極位
置を検出するためのホール素子等の検出器が必要であ
る。しかし、このブラシレスモータを空気調和機の圧縮
機の駆動に用いた場合、高温高圧の条件下で前記検出器
の信頼性が保証できないため、電機子巻線に誘起される
電圧信号を回転子位置信号に変換し、この回転子位置信
号に基づいてモータの転流信号を生成する方法が採用さ
れていた。
2. Description of the Related Art A brushless motor usually requires a detector such as a Hall element for detecting its magnetic pole position. However, when this brushless motor is used for driving a compressor of an air conditioner, the reliability of the detector cannot be guaranteed under high-temperature and high-pressure conditions. A method has been adopted in which the signal is converted into a signal and a commutation signal of the motor is generated based on the rotor position signal.

【0003】しかるに、電機子巻線に電圧が誘起される
のは回転子が回転している場合だけで、停止している場
合には回転子の位置情報は得られない。従って、起動時
には回転子の磁極位置にかかわらず電機子巻線に回転磁
界が発生するような特定の信号を与えて、回転子を強制
回転させることになる。ところが、この特定の信号は回
転子の磁極位置を無視して与えられるため、結果として
起動時に大きな始動電流が流れると共に、モータの振動
も大きくなる。
However, voltage is induced in the armature winding only when the rotor is rotating, and when it is stopped, the position information of the rotor cannot be obtained. Therefore, at the time of startup, a specific signal for generating a rotating magnetic field is given to the armature winding regardless of the magnetic pole position of the rotor, and the rotor is forcibly rotated. However, since this specific signal is given ignoring the position of the magnetic pole of the rotor, a large starting current flows at the time of starting, and the vibration of the motor also increases.

【0004】また、この始動電流が電機子巻線への電流
を、通電、遮断する半導体スイッチ素子群の許容電流を
超える場合には、起動不能ということになる。この問題
点を解決するために、従来は外部で定められた周波数及
びデューティ比の低いPWM信号に応じた電流を電機子
巻線に流して回転磁界を発生させ、このPWM信号の周
波数及びデューティ比を時間と共に徐々に増加させ、P
WM信号の所定の区間に生成された回転子位置信号、す
なわち、電機子巻線の所定の相の回転子位置信号が所定
の変化をしたとき、回転子位置検出信号に基づいた運転
に移行していた。
[0004] If the starting current exceeds the allowable current of the semiconductor switch element group for energizing and interrupting the current to the armature winding, it means that starting is impossible. In order to solve this problem, conventionally, a current corresponding to a PWM signal having a low frequency and a low duty ratio externally determined is passed through an armature winding to generate a rotating magnetic field, and the frequency and the duty ratio of the PWM signal are reduced. Gradually increases with time, and P
When the rotor position signal generated in a predetermined section of the WM signal, that is, the rotor position signal of a predetermined phase of the armature winding changes by a predetermined amount, the operation shifts to an operation based on the rotor position detection signal. I was

【0005】すなわち、図4に示すように、時刻t0
て起動指令が与えられてからPWM電圧のデュティ比
を、時間と共に増大させ、回転子位置信号が所定の変化
をした時刻t1 にて強制転流運転モードから回転子位置
検出運転モードに移行させていた。
That is, as shown in FIG. 4, after the start command is given at time t 0 , the duty ratio of the PWM voltage is increased with time, and at time t 1 at which the rotor position signal changes by a predetermined amount. Therefore, the mode is shifted from the forced commutation operation mode to the rotor position detection operation mode.

【0006】[0006]

【発明が解決しようとする課題】一般に、空気調和機の
圧縮機を駆動する場合、停止状態から起動を行うときの
負荷の状態は一定ではなく、また、直流電源電圧も若干
の変動が有り得る。このため、強制転流モードでのPW
M信号の周波数及びデューティ比は最も負荷が重い状態
でかつ電源電圧がある程度低い場合においても回転子が
回るように設定されていた。しかし、圧縮機がロックし
た状態を考慮しておらず、ロック状態にてPWM電圧の
デューティ比を図4に示したように増大させた場合、ブ
ラシレスモータにPWM電圧を供給する半導体スイッチ
素子群を破壊させる虞れがあった。
In general, when driving a compressor of an air conditioner, the load condition when starting from a stopped state is not constant, and the DC power supply voltage may have a slight variation. For this reason, PW in forced commutation mode
The frequency and duty ratio of the M signal are set so that the rotor rotates even when the load is the heaviest and the power supply voltage is somewhat low. However, if the duty ratio of the PWM voltage is increased as shown in FIG. 4 in the locked state without considering the locked state of the compressor, the semiconductor switch element group that supplies the PWM voltage to the brushless motor is not used. There was a risk of being destroyed.

【0007】本発明は上記の課題を解決するためになさ
れたもので、圧縮機がロック等の異常状態にある場合に
起動制御をしたとしても、ブラシレスモータにPWM電
圧を供給する半導体スイッチ素子群の破壊を未然に防止
することのできる圧縮機駆動電動機の制御装置を提供す
ることを目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a semiconductor switching element group for supplying a PWM voltage to a brushless motor even when starting control is performed when a compressor is in an abnormal state such as a lock. It is an object of the present invention to provide a control device for a compressor drive motor, which can prevent the destruction of the compressor.

【0008】[0008]

【課題を解決するための手段】第1の発明は、予め設定
された転流タイミングのPWM信号により強制的に半導
体スイッチ素子群を駆動して圧縮機駆動用のブラシレス
モータを起動する強制転流運転モードと、ブラシレスモ
ータの電機子巻線に誘起される電圧を検出して回転子位
置信号に変換し、この回転子位置信号に基づいて生成し
たPWM信号により半導体スイッチ素子群を駆動してブ
ラシレスモータを運転する回転子位置検出運転モードと
を有し、強制転流運転モードにおけるPWM信号の所定
の区間に生成された回転子位置信号が所定の変化をした
とき強制転流運転モードから回転子位置検出運転モード
に切替えるものであって、強制転流運転モードが、圧縮
機の起動から所定の時間だけ、PWM信号のデューティ
比を固定して運転するデューティ比固定強制転流運転モ
ードを含むものである。
According to a first aspect of the present invention, there is provided a forced commutation in which a semiconductor switch element group is forcibly driven by a PWM signal at a preset commutation timing to start a brushless motor for driving a compressor. The operation mode and the voltage induced in the armature winding of the brushless motor are detected and converted into a rotor position signal. The semiconductor switch element group is driven by a PWM signal generated based on the rotor position signal to drive the brushless motor. A rotor position detecting operation mode for operating the motor, wherein when the rotor position signal generated in a predetermined section of the PWM signal in the forced commutation operation mode changes by a predetermined amount, the rotor is switched from the forced commutation operation mode to the rotor. The forced commutation operation mode is switched to the position detection operation mode, and the operation is performed with the duty ratio of the PWM signal fixed for a predetermined time from the start of the compressor. That it is intended to include the duty ratio fixing forced commutation operation mode.

【0009】第2の発明は、デューティ比固定強制転流
運転モードでの運転終了時点で回転子位置信号が得られ
ないとき、それ以降の運転を停止するものである。
According to a second aspect of the present invention, when a rotor position signal cannot be obtained at the end of the operation in the duty ratio fixed forced commutation operation mode, the subsequent operation is stopped.

【0010】第3の発明は、デューティ比固定強制転流
運転モードにおけるPWM信号のデューティ比を3%以
上で15%以下とするものである。
According to a third aspect of the invention, the duty ratio of the PWM signal in the duty ratio fixed forced commutation operation mode is set to 3% or more and 15% or less.

【0011】第4の発明は、回転子位置信号の所定の変
化は、電機子巻線の1相の電圧レベルの変化であり、こ
のレベルの変化が所定回数に到達したとき、強制転流運
転モードから回転子位置検出運転モードに切替えるもの
である。
According to a fourth aspect of the present invention, the predetermined change in the rotor position signal is a change in the voltage level of one phase of the armature winding. When this level change reaches a predetermined number of times, the forced commutation operation is performed. The mode is switched to the rotor position detection operation mode.

【0012】第5の発明は、強制転流運転モードが、さ
らに、デューティ比固定強制転流運転モードでの運転終
了時点で回転子位置信号が得られたとき、PWM信号の
デューティ比を時間の経過に従って増大させて運転する
デューティ比増大強制転流運転モードを含むものであ
る。
According to a fifth aspect of the present invention, when the rotor position signal is obtained at the end of the operation in the forced commutation operation mode, the duty ratio of the PWM signal is set to a time. This includes a duty ratio increasing forced commutation operation mode in which the operation is performed with an increase in time.

【0013】[0013]

【発明の実施の形態】以下、本発明を好適な実施形態に
基づいて詳細に説明する。図1は本発明の一実施形態の
構成を、PWM電圧を供給する主回路系統と併せて示し
たブロック図である。同図における圧縮機駆動電動機の
制御装置は、直流電源1、6個のトランジスタとそれぞ
れに逆並列接続された6個のダイオードからなる半導体
スイッチ素子群2、三相結線された電機子巻線4と磁石
回転子5からなるブラシレスモータ3、ブラシレスモー
タ3の電機子巻線に誘起される電圧を検出して回転子位
置信号に変換する回転子位置検出手段6、回転子位置検
出手段6からの出力信号のエッジをカウントするするカ
ウント手段7、外部からの速度指令(信号)とカウント
手段7の出力信号から検出される実速度の差に応じて偏
差信号を出力する速度制御手段8、モータが起動したか
どうか判定する起動判定手段9、起動判定手段9の出力
信号に応じてデューティ比固定強制転流モードまたは回
転子位置検出モードに切り替える運転モード切替手段1
0、起動用の強制転流信号発生手段11、運転モード切
替手段10を介して送られる強制転流信号発生手段11
のタイミング信号または回転子位置検出信号のタイミン
グに合わせてベースとなる駆動信号を発生する駆動信号
発生手段12、速度制御手段8からの偏差信号に応じて
デューティ比指令信号を出力するデューティ比指令手段
13、デューティ比指令信号に応じてパルス幅を変調す
るパルス幅変調手段14、デューティ比固定強制転流モ
ードを所定時間保持させるためのタイマ手段15によっ
て構成される。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, together with a main circuit system for supplying a PWM voltage. The control device for the compressor drive motor shown in FIG. 1 includes a DC power supply 1, a semiconductor switch element group 2 composed of six transistors and six diodes connected in anti-parallel to each other, and an armature winding 4 connected in three phases. And a rotor position detecting means 6 for detecting a voltage induced in an armature winding of the brushless motor 3 and converting the voltage into a rotor position signal. Counting means 7 for counting the edges of the output signal, speed control means 8 for outputting a deviation signal according to the difference between an external speed command (signal) and the actual speed detected from the output signal of the counting means 7, Start-up determination means 9 for determining whether or not the start-up has been performed, and an operation mode for switching to a fixed duty ratio forced commutation mode or a rotor position detection mode in accordance with an output signal of the start-up determination means 9. De switching means 1
0, forced commutation signal generation means 11 for starting, forced commutation signal generation means 11 sent via operation mode switching means 10
Drive signal generating means 12 for generating a base drive signal in accordance with the timing signal or the timing of the rotor position detection signal, and a duty ratio command means for outputting a duty ratio command signal in response to a deviation signal from the speed control means 8. 13, pulse width modulation means 14 for modulating the pulse width in accordance with the duty ratio command signal, and timer means 15 for holding the duty ratio fixed forced commutation mode for a predetermined time.

【0014】上記の構成により、起動時は起動判定手段
9の判定に基づき強制転流信号発生手段11の出力信号
を運転モード切替手段10に加え、駆動信号発生手段1
2の出力信号に変調をかけて半導体スイッチ素子群2の
トランジスタを駆動してブラシレスモータ3を起動す
る。一方、回転子位置検出手段6の出力信号のうち、一
つは電機子巻線の1相分の出力のみを有効として起動判
定手段9へ出力信号を伝えるようになっている。起動判
定手段9では回転子位置検出手段6からの出力信号にエ
ッジ信号の立上りまたは立下りが検出された場合に強制
転流運転モードから回転子位置検出運転モードへの移行
を行う。
With the above configuration, at the time of starting, the output signal of the forced commutation signal generating means 11 is applied to the operation mode switching means 10 based on the judgment of the starting judging means 9, and the driving signal generating means 1
The brushless motor 3 is started by driving the transistors of the semiconductor switch element group 2 by modulating the output signal of the brushless motor 3. On the other hand, one of the output signals of the rotor position detecting means 6 is configured to transmit only the output of one phase of the armature winding to the activation judging means 9 while making the output valid. When the rising or falling edge signal is detected in the output signal from the rotor position detecting means 6, the start-up judging means 9 shifts from the forced commutation operation mode to the rotor position detecting operation mode.

【0015】上述したカウント手段7、速度制御手段
8、起動判定手段9、強制転流信号発生手段11、デュ
ーティ比指令手段13及びタイマ手段15はマイクロコ
ンピュータ16にその機能を持たせるものである。そこ
で、マイクロコンピュータ16の動作を含めて強制転流
運転及び回転子位置検出運転のより詳細な動作を説明す
るが、起動時の動作説明を容易にするために電機子巻線
4に誘起される電圧信号に基いてモータが駆動される回
転子位置検出運転モードの運転について先に説明する。
The above-described counting means 7, speed control means 8, activation judging means 9, forced commutation signal generating means 11, duty ratio command means 13 and timer means 15 make microcomputer 16 have its functions. Therefore, a more detailed operation of the forced commutation operation and the rotor position detection operation including the operation of the microcomputer 16 will be described. However, the operation is induced in the armature winding 4 in order to facilitate the description of the operation at the time of startup. The operation in the rotor position detection operation mode in which the motor is driven based on the voltage signal will be described first.

【0016】先ず、回転子位置検出運転モードでは、磁
石回転子5が回転すると、電機子巻線4に誘起電圧が発
生し、その電圧を回転子位置検出手段6に入力すること
によって回転子位置検出信号が得られている。このとき
運転モード切替手段10は起動判定手段9が起動状態と
判定していないことから、回転子位置検出回路6の出力
信号を用いるように切替えられているため、運転モード
切替手段10は回転子位置検出信号をそのまま出力して
駆動信号発生手段12に加える。駆動信号発生手段12
は回転子位置検出信号のタイミングを基準にした6個の
駆動信号を出力する。これらの駆動信号がデューティ比
指令手段13に従ってパルス幅変調されて半導体スイッ
チ素子群2に加えられる。これによって、半導体スイッ
チ素子群2がスイッチングされ、電機子巻線4に磁石回
転子5の回転トルクを発生するような磁界を発生させ、
モータの回転が維持される。
First, in the rotor position detecting operation mode, when the magnet rotor 5 rotates, an induced voltage is generated in the armature winding 4, and the voltage is input to the rotor position detecting means 6, whereby the rotor position is detected. A detection signal has been obtained. At this time, the operation mode switching means 10 has been switched to use the output signal of the rotor position detection circuit 6 since the activation determination means 9 has not determined that the activation state has been established. The position detection signal is output as it is and applied to the drive signal generation means 12. Drive signal generating means 12
Outputs six drive signals based on the timing of the rotor position detection signal. These drive signals are pulse width modulated in accordance with the duty ratio command means 13 and applied to the semiconductor switch element group 2. As a result, the semiconductor switch element group 2 is switched to generate a magnetic field in the armature winding 4 that generates a rotating torque of the magnet rotor 5,
The rotation of the motor is maintained.

【0017】次に、起動時の強制転流運転モードでは、
モータ停止状態で外部から速度指令信号が入力されると
速度制御手段8は、カウント手段7の出力信号から得ら
れる実速度と比較し、偏差に応じたデューティ比指令信
号の出力を開始する。このデューティ比指令信号はタイ
マ手段15にも入力される。タイマ手段15は、入力さ
れる信号が「0」の状態から「1」の状態になると起動
判定手段9とデューティ比指令手段13に所定時間起動
信号を与える。これに応答して運転モード切替手段10
はカウント手段7の出力信号の代わりにマイクロコンピ
ュータ16の強制転流信号発生手段11からの予め設定
された転流タイミングで生成される強制転流信号を駆動
信号発生手段12に所定時間だけ加える。また、マイク
ロコンピュータ16のデューティ比指令手段から起動用
のデューティ比指令信号が出力されてパルス幅変調手段
14に所定時間だけ加えられる。
Next, in the forced commutation operation mode at the time of starting,
When a speed command signal is input from the outside while the motor is stopped, the speed control means 8 compares the speed signal with the actual speed obtained from the output signal of the counting means 7 and starts outputting a duty ratio command signal according to the deviation. This duty ratio command signal is also input to the timer means 15. When the input signal changes from “0” to “1”, the timer 15 supplies a start signal to the start determination unit 9 and the duty ratio command unit 13 for a predetermined time. In response to this, the operation mode switching means 10
Applies a forced commutation signal generated at a preset commutation timing from the forced commutation signal generation means 11 of the microcomputer 16 to the drive signal generation means 12 for a predetermined time instead of the output signal of the counting means 7. A duty ratio command signal for starting is output from the duty ratio command means of the microcomputer 16 and is applied to the pulse width modulation means 14 for a predetermined time.

【0018】このとき、PWM信号のデューテイ比は、
ブラシレスモータ3の負荷が重い場合でも回転できるよ
うな値が設定される。本実施形態では負荷の重い状態を
通り越してロック状態である場合をも考慮し、例えば、
3%以上で15%以下の値の適当な値に設定すると共
に、その設定状態を図2に示したように所定時間(40
秒間)、すなわち、時刻t0 から時刻t1 まで保持す
る。そして、この所定時間を経過した時点にて1相の回
転位置検出信号のエッジが検出されたとすると、マイク
ロコンピュータ16に含まれるタイマ手段15は回転位
置検出信号のエッジを計数し、計数値が、例えば、機械
的に1回転する回数に等しくなると、起動判定手段9に
信号を与える。これによって、マイクロコンピュータ1
6は運転モード切替手段10に対して強制転流信号から
回転子位置検出手段7の位置検出信号の切替え指令を与
える。この時刻をt1 とすれば、図2から明らかなよう
に、起動指令が与えられた時刻t0 から時刻t1 までデ
ューティ比固定強制転流運転モードとなり、時刻t1
降は回転子位置検出運転モードとなり、速度制御手段8
からの偏差信号に応じて偏差を小さくするようにデュー
ティを増大させていく。
At this time, the duty ratio of the PWM signal is
A value is set so that the brushless motor 3 can rotate even when the load is heavy. In the present embodiment, in consideration of the case where the lock state is passed past the heavy load state, for example,
An appropriate value of 3% or more and 15% or less is set, and the setting state is set for a predetermined time (40%) as shown in FIG.
Sec), i.e., it holds from time t 0 to time t 1. If the edge of the one-phase rotation position detection signal is detected at the time when the predetermined time has elapsed, the timer means 15 included in the microcomputer 16 counts the edge of the rotation position detection signal, and the counted value is: For example, when it becomes equal to the number of times of one rotation mechanically, a signal is given to the activation determination means 9. Thereby, the microcomputer 1
Reference numeral 6 gives the operation mode switching means 10 a command to switch the position detection signal of the rotor position detection means 7 from the forced commutation signal. If the time and t 1, as is clear from FIG. 2, the start command as duty ratio fixed forced commutation operation mode from the time t 0 given until time t 1, the time t 1 after the rotor position detection The operation mode is set, and the speed control means 8
The duty is increased so as to reduce the deviation in accordance with the deviation signal from.

【0019】一方、デューティ比固定強制転流運転モー
ドで所定時間運転しても回転位置検出信号のエッジが検
出されなかったときには、マイクロコンピュータ16は
パルス幅変調手段14に対して通電停止の信号を出力
し、運転を停止させる。
On the other hand, when the edge of the rotation position detection signal is not detected after the operation in the fixed duty ratio forced commutation operation mode for a predetermined time, the microcomputer 16 sends a signal to the pulse width modulation means 14 to stop energization. Output and stop operation.

【0020】かくして、本実施形態によれば、起動の直
後にデューティ比固定強制転流運転モードを付加したの
で、圧縮機がロック等の異常状態にある場合に起動制御
をしたとしても、適切な措置を講じ得ることから、ブラ
シレスモータにPWM電圧を供給する半導体スイッチ素
子群の破壊を未然に防止することができる。
Thus, according to the present embodiment, since the duty ratio fixed forced commutation operation mode is added immediately after the start, even if the start control is performed when the compressor is in an abnormal state such as a lock, an appropriate start control is performed. Since measures can be taken, it is possible to prevent the breakdown of the semiconductor switch element group that supplies the PWM voltage to the brushless motor.

【0021】なお、デューティ比固定強制転流運転モー
ドでの運転時間はブラシレスモータ3の定格及びPWM
信号のデューティ比に応じて適宜変更しても良く。ま
た、回転子位置検出手段6の出力信号のエッジを計数す
る回数もブラシレスモータ3の磁石回転子5の極数に応
じて変更することができる。
The operation time in the duty ratio fixed forced commutation operation mode depends on the rating of the brushless motor 3 and the PWM.
It may be changed appropriately according to the duty ratio of the signal. Also, the number of times of counting the edges of the output signal of the rotor position detecting means 6 can be changed according to the number of poles of the magnet rotor 5 of the brushless motor 3.

【0022】発明者等の実験によれば、デューティ比固
定強制転流運転モードのデューティ比を3%より小さく
すると起動トルクが小さく圧縮機の起動を円滑に行うこ
とはできず、また、15%以上にすると半導体スイッチ
素子群2に対する負荷が大きくなり、過度の冷却装置が
必要になることが確認されている。したがって、起動時
に固定されるデューティ比は3%〜15%に設定するこ
とが望ましい。
According to experiments by the inventors, if the duty ratio in the fixed duty ratio forced commutation operation mode is smaller than 3%, the starting torque is small and the compressor cannot be started smoothly. It has been confirmed that the load on the semiconductor switch element group 2 increases in this way, and an excessive cooling device is required. Therefore, it is desirable to set the duty ratio fixed at the time of startup to 3% to 15%.

【0023】さらに、図3に示すように、起動指令が与
えられた時刻t0 から時刻t1 までデューティ比固定強
制転流運転モードとし、時刻t1 から時刻t2 までデュ
ティ比増大強制転流運転モードとし、デューティ比固定
強制転流モード以降にデューティ比を強制的に増大する
ようにしても良い。なお、デュティ比増大強制転流運転
モードになって、所定の時間を経過してもタイマ手段1
5から信号が出力されないときも同様にして通電停止の
信号を出力し、運転を停止させる。
Further, as shown in FIG. 3, the duty ratio is fixed commutation operation mode from time t 0 to time t 1 when the start command is given, and the duty ratio is increased from time t 1 to time t 2. The operation mode may be set, and the duty ratio may be forcibly increased after the fixed duty ratio forced commutation mode. It should be noted that even if a predetermined time has elapsed after the duty ratio increasing forced commutation operation mode has been set, the timer means 1
Similarly, when the signal is not output from 5, the signal for stopping the energization is output to stop the operation.

【0024】[0024]

【発明の効果】以上の説明によって明らかなように、本
発明に係る圧縮機駆動電動機の制御装置によれば、強制
転流運転モードにおけるPWM信号の所定の区間に生成
された回転子位置信号が所定の変化をしたとき強制転流
運転モードから回転子位置検出運転モードに切替えるに
当たり、強制転流運転モードが、圧縮機の起動から所定
の時間だけ、PWM信号のデューティ比を固定して運転
するデューティ比固定強制転流運転モードとしたので、
圧縮機がロック等の異常状態にある場合に起動制御をし
たとしても、その状況に応じた措置を講じ得るため、ブ
ラシレスモータにPWM電圧を供給する半導体スイッチ
素子群の破壊を未然に防止することができる。
As is apparent from the above description, according to the compressor drive motor control apparatus of the present invention, the rotor position signal generated in the predetermined section of the PWM signal in the forced commutation operation mode is used. When switching from the forced commutation operation mode to the rotor position detection operation mode when a predetermined change is made, the forced commutation operation mode operates with the duty ratio of the PWM signal fixed for a predetermined time from the start of the compressor. Since the fixed duty ratio forced commutation operation mode was used,
Even if start-up control is performed when the compressor is in an abnormal state such as a lock state, it is possible to take measures according to the situation, and thus to prevent destruction of the semiconductor switch element group that supplies the PWM voltage to the brushless motor. Can be.

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

【図1】本発明の一実施形態の構成を、PWM電圧を供
給する主回路系統と併せて示したブロック図。
FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, together with a main circuit system for supplying a PWM voltage.

【図2】図1に示した実施形態の動作を説明するため
に、PWM電圧のデューティ比と時間との関係を示した
線図。
FIG. 2 is a diagram showing a relationship between a duty ratio of a PWM voltage and time for explaining an operation of the embodiment shown in FIG. 1;

【図3】デューティ比増大強制転流モードを用いた実施
形態の動作を説明するために、PWM電圧のデューティ
比と時間との関係を示した線図。
FIG. 3 is a diagram showing a relationship between a duty ratio of a PWM voltage and time in order to explain an operation of an embodiment using a duty ratio increasing forced commutation mode.

【図4】従来の圧縮機駆動電動機の制御の概要を説明す
るために、PWM電圧のデューティ比と時間との関係を
示した線図。
FIG. 4 is a diagram showing a relationship between a duty ratio of a PWM voltage and time for explaining an outline of control of a conventional compressor drive motor.

【符号の説明】[Explanation of symbols]

1 直流電源 2 半導体スイッチ素子群 3 ブラシレスモータ 4 電機子巻線 5 磁石回転子 6 回転子位置検出手段 7 カウント手段 8 速度制御手段 9 起動判定手段 10 運転モード切替手段 11 強制転流信号発生手段 12 駆動信号発生手段 13 デューティ比指令手段 14 パルス幅変調手段 15 タイマ手段 16 マイクロコンピュータ DESCRIPTION OF SYMBOLS 1 DC power supply 2 Semiconductor switch element group 3 Brushless motor 4 Armature winding 5 Magnet rotor 6 Rotor position detecting means 7 Counting means 8 Speed control means 9 Startup judging means 10 Operation mode switching means 11 Forced commutation signal generating means 12 Drive signal generation means 13 duty ratio command means 14 pulse width modulation means 15 timer means 16 microcomputer

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】予め設定された転流タイミングのPWM信
号により強制的に半導体スイッチ素子群を駆動して圧縮
機駆動用のブラシレスモータを起動する強制転流運転モ
ードと、前記ブラシレスモータの電機子巻線に誘起され
る電圧を検出して回転子位置信号に変換し、この回転子
位置信号に基づいて生成したPWM信号により前記半導
体スイッチ素子群を駆動して前記ブラシレスモータを運
転する回転子位置検出運転モードとを有し、前記強制転
流運転モードにおけるPWM信号の所定の区間に生成さ
れた前記回転子位置信号が所定の変化をしたとき前記強
制転流運転モードから回転子位置検出運転モードに切替
える圧縮機駆動電動機の制御装置において、 前記強制転流運転モードが、前記圧縮機の起動から所定
の時間だけ、PWM信号のデューティ比を固定して運転
するデューティ比固定強制転流運転モードを含むことを
特徴とする圧縮機駆動電動機の制御装置。
1. A forced commutation operation mode in which a semiconductor switch element group is forcibly driven by a PWM signal of a preset commutation timing to start a brushless motor for driving a compressor, and an armature of the brushless motor. A voltage induced in the winding is detected and converted into a rotor position signal, and a PWM signal generated based on the rotor position signal drives the semiconductor switch element group to operate the brushless motor. And a rotor position detection operation mode when the rotor position signal generated in a predetermined section of the PWM signal in the forced commutation operation mode changes by a predetermined amount. In the control device for the compressor drive motor, the forced commutation operation mode is such that the PWM signal is deactivated for a predetermined time from the start of the compressor. A control device for a compressor drive motor, comprising a duty ratio fixed forced commutation operation mode in which the operation is performed with a fixed duty ratio.
【請求項2】前記デューティ比固定強制転流運転モード
での運転終了時点で回転子位置信号が得られないとき、
それ以降の運転を停止することを特徴とする請求項1に
記載の圧縮機駆動電動機の制御装置。
2. When the rotor position signal is not obtained at the end of the operation in the duty ratio fixed forced commutation operation mode,
The control device for a compressor drive motor according to claim 1, wherein the operation after that is stopped.
【請求項3】前記デューティ比固定強制転流運転モード
におけるPWM信号のデューティ比を3%以上で15%
以下とすることを特徴とする請求項1又は2に記載の圧
縮機駆動電動機の制御装置。
3. The duty ratio of the PWM signal in the duty ratio fixed forced commutation operation mode is 3% or more and 15% or more.
The control device for a compressor drive motor according to claim 1 or 2, wherein:
【請求項4】前記回転子位置信号の所定の変化は、電機
子巻線の1相の電圧レベルの変化であり、このレベルの
変化が所定回数に到達したとき、強制転流運転モードか
ら回転子位置検出運転モードに切替えることを特徴とす
る請求項1ないし3のいずれかに記載の圧縮機駆動電動
機の制御装置。
4. The predetermined change in the rotor position signal is a change in the voltage level of one phase of the armature winding. When the change in the level reaches a predetermined number of times, the rotation from the forced commutation operation mode is started. 4. The control device for a compressor drive motor according to claim 1, wherein the operation mode is switched to a child position detection operation mode.
【請求項5】前記強制転流運転モードが、前記デューテ
ィ比固定強制転流運転モードでの運転終了時点で回転子
位置信号が得られたとき、PWM信号のデューティ比を
時間の経過に従って増大させて運転するデューティ比増
大強制転流運転モードを含むことを特徴とする請求項1
ないし4のいずれかに記載の圧縮機駆動電動機の制御装
置。
5. When the rotor position signal is obtained at the end of the forced commutation operation mode in the forced commutation operation mode, the duty ratio of the PWM signal is increased with time. 2. A duty ratio increasing forced commutation operation mode in which the operation is performed in a forced operation mode.
5. The control device for a compressor drive motor according to any one of claims 4 to 4.
JP9199886A 1997-07-25 1997-07-25 Controller for compressor driving motor Pending JPH1146493A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9199886A JPH1146493A (en) 1997-07-25 1997-07-25 Controller for compressor driving motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9199886A JPH1146493A (en) 1997-07-25 1997-07-25 Controller for compressor driving motor

Publications (1)

Publication Number Publication Date
JPH1146493A true JPH1146493A (en) 1999-02-16

Family

ID=16415251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9199886A Pending JPH1146493A (en) 1997-07-25 1997-07-25 Controller for compressor driving motor

Country Status (1)

Country Link
JP (1) JPH1146493A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8159162B2 (en) 2007-12-28 2012-04-17 Denso Corporation Motor control apparatus, vehicle fan drive apparatus, and motor control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8159162B2 (en) 2007-12-28 2012-04-17 Denso Corporation Motor control apparatus, vehicle fan drive apparatus, and motor control method

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