JPH0632800Y2 - Electric motor starter - Google Patents
Electric motor starterInfo
- Publication number
- JPH0632800Y2 JPH0632800Y2 JP1988040848U JP4084888U JPH0632800Y2 JP H0632800 Y2 JPH0632800 Y2 JP H0632800Y2 JP 1988040848 U JP1988040848 U JP 1988040848U JP 4084888 U JP4084888 U JP 4084888U JP H0632800 Y2 JPH0632800 Y2 JP H0632800Y2
- Authority
- JP
- Japan
- Prior art keywords
- electric motor
- output
- terminal
- voltage
- motor
- 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
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【考案の詳細な説明】 (イ)産業上の利用分野 本考案は固定子巻線に生じる誘起電圧を検出して回転子
の回転位置を得るように成した電動機の起動装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a motor starter configured to detect an induced voltage generated in a stator winding to obtain a rotational position of a rotor.
(ロ)従来の技術 一般にこのような電動機の従来の起動装置としては、特
公昭58−55758号公報に記載されているようなものがあ
った。この公報に記載されたものは、起動時に、一定時
間の計時を行なう起動信号回路から出力が出ている間
は、固定子巻線への通電の切換えを３相発振回路に基づ
いて強制的に行ない、（同期電動機として動作させ
る。）起動信号回路による計時が終了した後に誘起電圧
に基づいた通電の切換えに変わるものであった。(B) Conventional Technology As a conventional starting device for such an electric motor, there has been a device described in Japanese Patent Publication No. 58-55758. The one disclosed in this publication forcibly switches the energization to the stator winding based on a three-phase oscillator circuit while an output is being output from a start signal circuit that measures a certain time at startup. The operation was performed (operated as a synchronous motor), and after the timing of the start signal circuit was completed, switching to energization based on the induced voltage was performed.
このような構成にすることによって、電動機の起動時に
は電動機を強制的に同期電動機として作用させ、起動不
良を防止したものであった。With such a configuration, at the time of starting the electric motor, the electric motor is forcibly acted as a synchronous electric motor to prevent starting failure.
(ハ)考案が解決しようとする課題 以上のような従来の技術では、起動信号回路による同期
運転中に同期をとらなければならないため、計時時間に
余裕を持たせる必要があった。そのため誘起電圧に基づ
く通常の運転に至るまでの時間が長くなり立ち上り特性
の悪い起動装置となっていた。すなわち、電動機の同期
が取れているにもかかわらず起動信号回路による計時時
間の間は通常運転が行なえず、立ち上りが遅くなるもの
であった。(C) Problems to be Solved by the Invention In the conventional technology as described above, it is necessary to have a margin in timekeeping time because synchronization is required during the synchronous operation by the start signal circuit. Therefore, it takes a long time to reach the normal operation based on the induced voltage, and the starting device has a poor start-up characteristic. That is, although the electric motors are synchronized, the normal operation cannot be performed during the time measured by the start signal circuit, and the start-up is delayed.
斯かる問題点に鑑み、本考案は立ち上り特性のよい起動
装置を提供するものである。In view of such a problem, the present invention provides a starting device having a good start-up characteristic.
(ニ)課題を解決するための手段 本考案は回転子の回転位置に基づいて固定子巻線への通
電を切換える電動機の起動装置において、回転子の回転
位置に応じてパルス出力を出す位置検出部と、この位置
検出部のパルス出力の数に応じて起動時と通常運転時と
を判別する判別部と、起動期間中は電源の出力端子間の
ダミー抵抗を用いて電動機の印加電圧を下げる制御部と
を備えたものである。(D) Means for Solving the Problems The present invention is a position detection device that outputs a pulse output according to the rotational position of a rotor in an electric motor starter that switches energization to a stator winding based on the rotational position of the rotor. Section, a discriminating section for discriminating between startup and normal operation according to the number of pulse outputs of this position detection section, and a dummy resistor between the output terminals of the power supply during the startup period to lower the voltage applied to the electric motor. And a control unit.
(ホ)作用 このように構成された電動機の起動装置は起動時と通常
運転時との判別を回転子の回転位置に応じたパルス出力
の数をカウントして行なうものである。(E) Action The electric motor starter configured as described above discriminates between startup and normal operation by counting the number of pulse outputs corresponding to the rotational position of the rotor.
(ヘ)実施例 以下本考案の実施例を図面に基づいて説明する。第１図
は電動機の起動装置の要部電気回路図であり、図中１は
単相の交流電源（商用電源）、２は整流平滑定電圧回路
であり、交流電源１から与えられる交流を整流し、かつ
平滑した後、端子Ｉに与えられた電圧信号に応じた直流
電圧に変換して端子Ｏから出力する。３は制御部であ
り、端子Ｆに与えられる電動機の回転数信号に応じた電
圧信号を端子Ｏ１から整流平滑定電圧回路２の端子Ｉに
出力すると共に、端子Ｐに与えられるエッジトリガーに
よって端子Ｏ２の出力及び端子Ｄの出力が制御される。
４はスイッチング素子であり、制御部３の端子Ｏ２の出
力によってON/OFFが制御される。このスイッチング素子
４がONになることによって抵抗５が整流平滑定電圧回路
２の出力端子Ｏに並列に接続され、端子Ｏの出力電圧を
強制的に下げることができる。この下げ幅は抵抗５の値
によって設定することができる。６は複数のスイッチン
グ素子を三相ブリッジ状に結線してなるインバータ回路
であり、夫々のスイッチング素子のON/OFFは制御部３の
端子Ｄの出力によって制御されている。７は比較器であ
り、DCブラシレスモータ８の夫々三相巻線に供給される
電圧の変化を夫々抵抗9,10,11を介して入力し、整流平
滑定電圧回路２の端子Ｏから出力される電圧を抵抗12,1
3で分割した電圧と比較するものである。(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an electric circuit diagram of a main part of an electric motor starter. In the figure, 1 is a single-phase AC power supply (commercial power supply), 2 is a rectifying / smoothing constant voltage circuit, and rectifies an AC supplied from the AC power supply 1. After smoothing and smoothing, it is converted into a DC voltage according to the voltage signal applied to the terminal I and output from the terminal O. Reference numeral 3 denotes a control unit, which outputs a voltage signal according to the rotation speed signal of the electric motor given to the terminal F from the terminal O 1 to the terminal I of the rectifying / smoothing constant-voltage circuit 2 and also by the edge trigger given to the terminal P. The output of O 2 and the output of the terminal D are controlled.
Reference numeral 4 denotes a switching element, ON / OFF of which is controlled by the output of the terminal O 2 of the control unit 3. When the switching element 4 is turned on, the resistor 5 is connected in parallel to the output terminal O of the rectifying / smoothing constant voltage circuit 2, and the output voltage of the terminal O can be forcibly reduced. This reduction width can be set by the value of the resistor 5. Reference numeral 6 denotes an inverter circuit in which a plurality of switching elements are connected in a three-phase bridge shape, and ON / OFF of each switching element is controlled by an output of a terminal D of the control unit 3. Reference numeral 7 denotes a comparator, which inputs changes in voltage supplied to the three-phase windings of the DC brushless motor 8 via resistors 9, 10 and 11, respectively, and is output from a terminal O of the rectifying and smoothing constant voltage circuit 2. Voltage to the resistor 12,1
It is to be compared with the voltage divided by 3.
第２図は第１図に示した制御部３及び周辺の部品の主な
動作を示す動作説明図である。まずステップＳ１で電動
機８を起動するか否かの判断を行ない、電動機８を起動
しない時には“Ｎ＝10"に設定する。また電動機８を起
動する時は固定子巻線への通電を開始して回転子の回転
による誘起電圧を発生させる。次にステップＳ２にて比
較器７からの信号があるか否かを判断し、信号が確認さ
れた時にはステップＳ３にて信号に基づく固定子巻線の
通電切換えを行なうと共に端子Ｆに与えられる回転数信
号に基づく直流電圧を整流平滑定電圧回路２の端子Ｏか
ら出力させる。次にステップＳ４でカウンタの変数Ｎが
“Ｎ≦0"か否かを判断し、“Ｎ≦0"を満さない時はステ
ップＳ５にて“Ｎ≦0"になるまで端子Ｏ２からの出力で
スイッチング素子４をON状態にする。また“Ｎ≦0"を満
している時にはステップＳ６にて“Ｎ＝0"にしスイッチ
ング素子４をOFF状態にする。FIG. 2 is an operation explanatory view showing main operations of the control unit 3 and peripheral components shown in FIG. First, in step S 1 , it is determined whether or not to start the electric motor 8. When the electric motor 8 is not started, "N = 10" is set. When the electric motor 8 is started, the stator winding is energized to generate an induced voltage due to the rotation of the rotor. Then it is determined whether there is a signal from the comparator 7 at Step S 2, when the signal is confirmed supplied to the terminal F with the energization switching stator winding based on the signal in step S 3 A DC voltage based on the generated rotation speed signal is output from the terminal O of the rectifying / smoothing constant voltage circuit 2. Then variable N of the counter in step S 4, it is determined whether or not "N ≦ 0", "N ≦ 0" to step S 5 when fully is not "N ≦ 0" terminal O 2 until the The switching element 4 is turned on by the output from. Also the "N ≦ 0" when you are fully to the switching element 4 to "N = 0" in step S 6 in the OFF state.
このように構成された電動機の起動装置は起動に費やす
時間を比較器からの信号の数によって決定することがで
きる。すなわち、回転子の回転数は回転が安定する（起
動が終了）につれて速くなる（設定回転数になる）ので
Ｎ回のカウントに達しやすくなる。The electric motor starter configured as described above can determine the time required for start-up based on the number of signals from the comparator. That is, since the rotation speed of the rotor becomes faster (becomes the set rotation speed) as the rotation stabilizes (starting is completed), it is easy to reach the count of N times.
(ト)考案の効果 本考案は回転子の回転位置に基づいて固定子巻線への通
電を切換える電動機の起動装置において、回転子の回転
位置に応じてパルス出力を出す位置検出部と、この位置
検出部のパルス出力の数に応じて起動時と通常運転時と
を判別する判別部と、起動期間中は電源の出力端子間の
ダミー抵抗を用いて電動機の印加電圧を下げる制御部と
を備えたので、起動期間の終了をパルス出力の数によっ
て判断し、不要な起動期間を抑制でき立ち上りの速い起
動を得ることができる。すなわち、起動が終了した後に
はパルス出力の出力周期が短くなりパルス出力の数のカ
ウントが速くなりその分不要な起動期間の短縮が図れる
ものである。(G) Effect of the Invention This invention is a starter for an electric motor that switches energization to the stator winding based on the rotational position of the rotor, and a position detector that outputs a pulse output according to the rotational position of the rotor, and A discrimination unit that discriminates between startup and normal operation according to the number of pulse outputs of the position detection unit, and a control unit that lowers the voltage applied to the motor by using a dummy resistor between the output terminals of the power supply during the startup period. Since it is provided, it is possible to determine the end of the start-up period based on the number of pulse outputs, suppress the unnecessary start-up period, and obtain a start-up with a quick start-up. That is, after the startup is completed, the output cycle of the pulse output is shortened, the number of pulse outputs is counted faster, and the unnecessary startup period can be shortened accordingly.
第１図は本考案の実施例を示す装置の要部電気回路図、
第２図は第１図に示した装置の主な動作を示す動作説明
図である。 １……交流電源、２……整流平滑定電圧回路、３……制
御部、４……スイッチング素子、５……抵抗、６……イ
ンバータ回路、７……比較器、８……DCブラシレスモー
タ。FIG. 1 is an electric circuit diagram of a main part of an apparatus showing an embodiment of the present invention,
FIG. 2 is an operation explanatory view showing the main operation of the apparatus shown in FIG. 1 ... AC power supply, 2 ... Rectification smoothing constant voltage circuit, 3 ... Control unit, 4 ... Switching element, 5 ... Resistor, 6 ... Inverter circuit, 7 ... Comparator, 8 ... DC brushless motor .
Claims (1)
度回転する毎に得られるパルスに応じて前記固定子巻線
の通電組合せを順に変えるように成したブラシレス電動
機の起動装置において、電動機の起動開始時から前記パ
ルスの出力数をカウントするカウンタと、このカウンタ
のカウント値が所定値に達したか否かを判別する判別部
と、この判別部が否を判別している間電動機に印加され
ている電圧を下げる制御部とを備えたことを特徴とする
電動機の起動装置。1. A starter for a brushless motor having a plurality of stator windings, wherein the energizing combinations of the stator windings are sequentially changed according to a pulse obtained each time the rotor rotates by a predetermined angle. In the above, a counter that counts the number of pulses output from the start of the electric motor, a determination unit that determines whether or not the count value of this counter has reached a predetermined value, and this determination unit determines whether or not the count value has reached a predetermined value. And a control unit that lowers the voltage applied to the inter-motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988040848U JPH0632800Y2 (en) | 1988-03-28 | 1988-03-28 | Electric motor starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988040848U JPH0632800Y2 (en) | 1988-03-28 | 1988-03-28 | Electric motor starter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01143298U JPH01143298U (en) | 1989-10-02 |
| JPH0632800Y2 true JPH0632800Y2 (en) | 1994-08-24 |
Family
ID=31267308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988040848U Expired - Lifetime JPH0632800Y2 (en) | 1988-03-28 | 1988-03-28 | Electric motor starter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632800Y2 (en) |
-
1988
- 1988-03-28 JP JP1988040848U patent/JPH0632800Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01143298U (en) | 1989-10-02 |
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