JPH0648915B2 - Brushless motor induced voltage detection circuit - Google Patents
Brushless motor induced voltage detection circuitInfo
- Publication number
- JPH0648915B2 JPH0648915B2 JP62023125A JP2312587A JPH0648915B2 JP H0648915 B2 JPH0648915 B2 JP H0648915B2 JP 62023125 A JP62023125 A JP 62023125A JP 2312587 A JP2312587 A JP 2312587A JP H0648915 B2 JPH0648915 B2 JP H0648915B2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- control
- voltage
- output
- detection
- 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.)
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Description
【発明の詳細な説明】 （イ）産業上の利用分野 本発明はテープレコーダあるいはビディオテープレコー
ダに用いられるブラシレスモータの誘起電圧検出回路に
関する。The present invention relates to an induced voltage detection circuit for a brushless motor used in a tape recorder or a video tape recorder.
（ロ）従来の技術 最近テープレコーダあるいはビディオテープレコーダ等
においては、雑音が発生しないことあるいは寿命が長い
ことのためブラシレスモータが多く用いられている。前
記ブラシレスモータは例えば実開昭５９−５３６９６号
公報に記載されているように、位相検出器にて回転子の
位置を検出し、それによってスイッチングトランジスタ
を順次オンオフさせ各相のコイルに順次電流を流し、回
転子の回転速度を検出している。(B) Prior Art Recently, in tape recorders, video tape recorders, and the like, brushless motors are often used because they do not generate noise or have a long life. As described in, for example, Japanese Utility Model Laid-Open No. 59-53696, the brushless motor detects the position of the rotor with a phase detector, thereby sequentially turning on / off the switching transistors and sequentially supplying current to the coils of each phase. It detects the rotation speed of the rotor.
（ハ）発明が解決しようとする問題点 上述のようにスイッチングトランジスタを順次オンオフ
させ、それによって前記スイッチングトランジスタに接
続されている各相のコイルに電流を流し、前記コイルを
励磁することにより回転子を回転させることが出来る
が、しかし回転子の回転速度は負荷の大きさ等により変
動するので、特にキャプスタンモータとして前記ブラシ
レスモータを用いるときには回転子の回転速度を一定に
する必要がある。回転子の速度を一定にするには回転子
の回転速度を検出する必要があるが、回転速度を直接検
出することは困難である。(C) Problems to be Solved by the Invention As described above, the switching transistors are sequentially turned on and off, whereby a current is passed through the coils of each phase connected to the switching transistors, and the coils are excited to rotate the rotor. However, since the rotation speed of the rotor fluctuates depending on the size of the load and the like, it is necessary to keep the rotation speed of the rotor constant especially when the brushless motor is used as the capstan motor. It is necessary to detect the rotation speed of the rotor in order to keep the speed of the rotor constant, but it is difficult to directly detect the rotation speed.
本発明はそこで各相のコイルに生じる誘起電圧が回転数
に比例することに着目し、回転数の検出のために前記誘
起電圧を検出する回路に関するもので、特に低電圧で動
作可能にした誘起電圧検出回路を提供するものである。Therefore, the present invention focuses on the fact that the induced voltage generated in the coils of each phase is proportional to the number of revolutions, and relates to a circuit for detecting the induced voltage in order to detect the number of revolutions. A voltage detection circuit is provided.
（ニ）問題点を解決するための手段 本発明のブラシレスモータの誘起電圧検出回路は、多数
の相を構成する複数のコイルに誘起される誘起電圧にて
順次オンされる複数の検出半導体素子と、これら検出半
導体素子に直列接続された共通の出力トランジスタ及び
出力抵抗と、該出力抵抗に生じる制御電圧を取出す制御
電圧出力端子と、コレクタ・エミッタが前記検出半導体
素子と同等の半導体素子及び制御抵抗を介し電源間に接
続され前記制御電圧にて制御される制御トランジスタ
と、前記制御トランジスタのコレクタ又はエミッタに接
続された第１トランジスタ及びベースが前記検出半導体
素子に接続された第２トランジスタとよりなる差動増幅
回路とにて構成される。(D) Means for Solving the Problems An induced voltage detection circuit for a brushless motor according to the present invention includes a plurality of detection semiconductor elements that are sequentially turned on by induced voltages induced in a plurality of coils forming a large number of phases. A common output transistor and an output resistance connected in series to these detection semiconductor elements, a control voltage output terminal for extracting a control voltage generated in the output resistance, and a semiconductor element and a control resistance whose collector and emitter are equivalent to those of the detection semiconductor element. And a first transistor connected to the collector or emitter of the control transistor and a second transistor whose base is connected to the detection semiconductor element. It is composed of a differential amplifier circuit.
（ホ）作 用 本発明のブラシレスモータの誘起電圧検出回路は上述の
如き構成をなすので、モータの回転時に生じるある大き
さ以上の誘起電圧にて検出半導体素子がオンされ出力ト
ランジスタを介し出力抵抗に制御電圧を生じる。その制
御電圧は制御電圧出力端子より取出され速度制御を行う
一方、制御トランジスタを制御する。又差動増幅回路の
第１トランジスタのベースには前記制御トランジスタの
コレクタ電流が加わり、第２トランジスタのベースには
検出半導体素子の出力電流が加わり、且つ前記出力抵抗
と制御トランジスタに接続した制御抵抗との抵抗値を等
しくしたので、検出半導体素子、出力トランジスタ及び
出力抵抗の直列回路に流れる電流と電源及びアース間に
接続された半導体素子、制御トランジスタ及び制御抵抗
との直列回路に流れる電流とが等しくなる。従って動作
最低電圧は電源及びアース間に接続された半導体素子及
び制御トランジスタの動作最低電圧と前記制御電圧の和
でよいので低くされる。(E) Operation Since the induced voltage detection circuit of the brushless motor of the present invention is configured as described above, the detection semiconductor element is turned on by the induced voltage of a certain magnitude or more generated when the motor rotates, and the output resistance is output via the output transistor. Produces a control voltage. The control voltage is taken out from the control voltage output terminal to control the speed while controlling the control transistor. Further, the collector current of the control transistor is added to the base of the first transistor of the differential amplifier circuit, the output current of the detection semiconductor element is added to the base of the second transistor, and the output resistor and the control resistor connected to the control transistor are added. Since the resistance values of and are equal, the current flowing in the series circuit of the detection semiconductor element, the output transistor and the output resistance and the current flowing in the series circuit of the semiconductor element, the control transistor and the control resistance connected between the power source and the ground are Will be equal. Therefore, the minimum operating voltage is lowered because it is the sum of the minimum operating voltage of the semiconductor element and the control transistor connected between the power source and ground and the control voltage.
（ヘ）実施例 本発明のブラシレスモータの誘起電圧検出回路の実施例
を図面に従って説明する。(F) Embodiment An embodiment of the induced voltage detection circuit of the brushless motor of the present invention will be described with reference to the drawings.
(1)(2)(3)はＵ相、Ｖ相、Ｗ相となる第１、第２及び第
３コイルで、一端は正電源端子に直接接続され他端は夫
々第１、第２及び第３スイッチングトランジスタ(4)(5)
(6)を介し接地される。前記第１、第２及び第３スイッ
チングトランジスタ(4)(5)(6)はベースに回転子の回転
を検出する検出器（図示せず）よりのスイッチ信号、あ
るいは特開昭５８−１７２９９４号公報に記載されてい
るごとく各コイルに生じる誘起電圧と基準電圧とを比較
して得られる信号が加えられ順次オンされる。(7)(8)
(9)は前記第１、第２及び第３コイル(1)(2)(3)の誘起電
圧を検出する検出ダイオードで、検出抵抗(10)(11)(12)
を介し前記第１、第２及び第３コイル(1)(2)(3)の一端
に接続されている。(13)(14)は前記検出ダイオード(7)
(8)(9)とアース間に直列接続された出力トランジスタと
出力抵抗で、該出力抵抗(14)に生じる制御電圧を取出す
制御電圧出力端子(15)を有する。(16)(17)は第１及び第
２制御トランジスタで、第１制御トランジスタ(16)には
トランジスタ(18)(19)よりなる定電流回路を介し駆動電
流が供給されるとともにベースに前記制御電圧が加えら
れ、又第２制御トランジスタ(17)のベースは第１制御ト
ランジスタ(16)のコレクタに接続され、且つコレクタ・
エミッタは夫々前記検出ダイオード(7)(8)(9)と同一の
ダイオード(20)及び制御抵抗(21)を介し電源に接続され
ている。(22)は差動増幅回路で、前記第２制御トランジ
スタ(17)のコレクタにベースが接続された第１トランジ
スタ(23)と、検出ダイオード(7)(8)(9)にベースが接続
された第２トランジスタ(24)とよりなり、前記第１トラ
ンジスタ(23)のコレクタには前記出力トランジスタ(13)
のベースが接続されている。(1) (2) (3) are first, second and third coils which are U-phase, V-phase and W-phase, respectively, one end of which is directly connected to the positive power supply terminal and the other end of which is the first, second and third coils respectively. Third switching transistor (4) (5)
Grounded via (6). The first, second and third switching transistors (4), (5) and (6) are switch signals from a detector (not shown) for detecting the rotation of the rotor at the base, or JP-A-58-172994. As described in the publication, a signal obtained by comparing the induced voltage generated in each coil with the reference voltage is added and sequentially turned on. (7) (8)
(9) is a detection diode for detecting the induced voltage of the first, second and third coils (1), (2) and (3), and detection resistors (10), (11) and (12)
Is connected to one end of each of the first, second and third coils (1), (2) and (3). (13) (14) is the detection diode (7)
(8) An output transistor and an output resistance connected in series between (9) and ground, and a control voltage output terminal (15) for extracting a control voltage generated in the output resistance (14). (16) (17) is a first and a second control transistor, a drive current is supplied to the first control transistor (16) through a constant current circuit composed of transistors (18) and (19), and the control is performed on the base. A voltage is applied and the base of the second control transistor (17) is connected to the collector of the first control transistor (16), and
The emitters are connected to the power source through the same diode (20) and control resistor (21) as the detection diodes (7), (8) and (9), respectively. Reference numeral (22) is a differential amplifier circuit, and the base is connected to the first transistor (23) whose base is connected to the collector of the second control transistor (17) and the detection diodes (7), (8) and (9). A second transistor (24), and the output transistor (13) is connected to the collector of the first transistor (23).
The base of is connected.
前記検出抵抗(10)(11)(12)の抵抗値は全て同一で、又出
力抵抗(14)と制御抵抗(21)との抵抗値も同一にしてい
る。The resistance values of the detection resistances (10), (11) and (12) are all the same, and the resistance values of the output resistance (14) and the control resistance (21) are also the same.
次に本発明のブラシレスモータの誘起電圧検出回路の動
作を説明する。Next, the operation of the induced voltage detection circuit of the brushless motor of the present invention will be described.
今回転子が回転されていると、回転検出器等より回転に
応じスイッチ信号を生じ第１、第２及び第３スイッチン
グトランジスタ(4)(5)(6)を順次オンするので、第１、
第２及び第３コイル(1)(2)(3)の順に通電を行う。例え
ば第２図(イ)に示すＴ１期間中は第１スイッチングトラ
ンジスタ(4)がオンし、第１コイル(1)に通電し励磁する
ので、回転子の磁石との間に電磁力を生じ回転子を回転
する。回転子が回転しＴ２期間になると第２スイッチン
グトランジスタ(5)がオンされ第２コイル(2)に通電を行
い、Ｔ３期間になると第３スイッチングトランジスタ
(6)がオンされ第３コイル(3)に通電を行い回転子を回転
させる。ところで回転子が回転されると前記第１、第２
及び第３コイル(1)(2)(3)に第２図(イ)に示す如き誘起
電圧が生じ、その誘起電圧は検出抵抗(10)(11)(12)を介
し前記検出ダイオード(7)(8)(9)のアノード側に印加さ
れる。ところで検出ダイオード(7)(8)(9)のカソードに
接続された出力トランジスタ(13)のベースは差動増幅回
路(22)の第１トランジスタ(23)のコレクタに接続され、
前記第１トランジスタ(23)のベースは出力トランジスタ
(13)を介し得られる制御電圧にて制御される第２制御ト
ランジスタ(17)のコレクタに接続されているため、前記
検出ダイオード(7)(8)(9)のカソード電位はダイオード
(20)のカソード電位と等しくなっている。従って検出ダ
イオード(7)(8)(9)のカソード電位は ＶCC−ＶF≒ＶCC−０．６（Ｖ） ……(1) 但しＶCC……電源電圧 ＶF……検出ダイオード(7)(8)(9)のアノード・カソード
間電圧に固定される。そのため前記誘起電圧が中性点に
加えられている電源電圧ＶCCを越えると、検出ダイオー
ド(7)(8)(9)は順次導通するので検出抵抗(10)(11)(12)
は流れる電流は出力トランジスタ(13)を通して出力抵抗
(14)に流れる。この電流Ｉは第１、第２及び第３コイル
(1)(2)(3)に生じる誘起電圧をＥu、Ｅv、Ｅｗとすれ
ば、 Ｒ91、Ｒ92、Ｒ93…検出抵抗(10)(11)(12)の抵抗値 となる。但し第１、第２及び第３検出ダイオード(7)(8)
(9)の各相の電流はsinωｔ＞０の期間のみ通電される。
前記検出抵抗(10)(11)(12)の抵抗値は前述した如く同一
にされているので、出力抵抗(14)に生じる制御電圧ＶSP
は Ｒ94…出力抵抗(14)の抵抗値 となり、第２図(ロ)に示すように誘起電圧Ｅu、Ｅv、Ｅ
ｗに比例した電圧が得られる。前記誘起電圧Ｅu、Ｅv、
Ｅｗはモータの回転数に比例するから、検出抵抗(10)(1
1)(12)と出力抵抗(14)との温度係数を等しくすれば周囲
の温度変化に影響を与えない。When the rotor is rotating now, a rotation detector or the like generates a switch signal according to the rotation, and the first, second, and third switching transistors (4), (5), and (6) are sequentially turned on.
Energization is performed in order of the second and third coils (1) (2) (3). For example, during the period T 1 shown in FIG. 2 (a), the first switching transistor (4) is turned on, the first coil (1) is energized and excited, so that an electromagnetic force is generated between it and the rotor magnet. Rotate the rotor. The second switching transistor (5) is turned on to energize the second coil (2) when the rotor rotates for the T 2 period, and the third switching transistor (5) is turned on for the T 3 period.
When (6) is turned on, the third coil (3) is energized to rotate the rotor. By the way, when the rotor is rotated, the first and second rotors are rotated.
An induced voltage as shown in FIG. 2 (a) is generated in the third coil (1) (2) (3), and the induced voltage is detected by the detection diode (7) via the detection resistors (10) (11) (12). ) (8) (9) is applied to the anode side. By the way, the base of the output transistor (13) connected to the cathodes of the detection diodes (7), (8) and (9) is connected to the collector of the first transistor (23) of the differential amplifier circuit (22),
The base of the first transistor (23) is an output transistor
Since it is connected to the collector of the second control transistor (17) controlled by the control voltage obtained via (13), the cathode potential of the detection diodes (7), (8) and (9) is a diode.
It is equal to the cathode potential of (20). Therefore, the cathode potential of the detection diodes (7), (8), (9) is V CC -V F ≈ V CC -0.6 (V) ... (1) However, V CC ... power supply voltage V F ... detection diode ( It is fixed to the voltage between the anode and cathode of 7), 8), and 9). Therefore, when the induced voltage exceeds the power supply voltage V CC applied to the neutral point, the detection diodes (7), (8) and (9) are sequentially turned on, so that the detection resistors (10), (11) and (12).
Is the output resistance through the output transistor (13)
It flows to (14). This current I is applied to the first, second and third coils
(1) (2) the induced voltage generated in (3) E u, E v , if E w, R 91 , R 92 , R 93 ... The resistance values of the detection resistors (10), (11) and (12). However, the first, second and third detection diodes (7) (8)
The current of each phase in (9) is applied only during the period of sin ωt> 0.
Since the resistance values of the detection resistors (10), (11) and (12) are the same as described above, the control voltage V SP generated at the output resistor (14) is
Is R 94 becomes the resistance value of the output resistance (14), and as shown in Fig. 2 (b), induced voltages Eu , Ev , E
A voltage proportional to w is obtained. The induced voltages Eu , Ev ,
Since E w is proportional to the rotation speed of the motor, the detection resistance (10) (1
1) If the temperature coefficients of (12) and output resistance (14) are made equal, there is no effect on ambient temperature changes.
前記制御電圧ＶSPは第１、第２及び第３コイル(1)(2)
(3)と電源間に接続された速度制御トランジスタ（図示
せず）のベースに加えられ、該速度制御トランジスタを
制御し、前記第１、第２及び第３コイル(1)(2)(3)に供
給される電圧を増減することにより前記回転数を一定に
出来る。ところで前記制御電圧ＶSPは第１制御トランジ
スタ(16)のベースにも加えられる。一方第１制御トラン
ジスタ(16)のエミッタ・コレクタには定電流回路(22)を
介して定電流が流れ、且つ第１及び第２制御トランジス
タ(16)(17)はエミッタホロワ接続されているので制御抵
抗(21)の両端にも制御電圧が生じる。前記出力抵抗(14)
と制御抵抗(21)との抵抗値は前述した如く等しくしてい
るので、ダイオード(20)に流れる電流は検出ダイオード
(7)(8)(9)に流れる電流とほぼ等しくなり、第１、第２
及び第３コイル(1)(2)(3)に生じる誘起電圧が高く検出
電流が大きくなれば、出力抵抗(14)の制御電圧とともに
制御抵抗(21)に生じる電圧降下は大きくなり、逆に前記
誘起電圧が低く検出電流が小さくなれば制御電圧ととも
に制御抵抗(21)に生じる電圧も低下する。このように検
出ダイオード(7)(8)(9)、出力トランジスタ(13)及び出
力抵抗(14)に生じると同一の電流が電源とアース間に直
列接続されたダイオード(20)、第２制御トランジスタ(1
7)及び制御抵抗(21)にも生じる。この回路の最低動作電
圧（ＶMIN）は ＶMIN＝ＶSP＋ＶCE＋ＶＦ ……(4) 但しＶCE…出力トランジスタ(13)のコレクタ・エミッタ
間電圧 ＶＦ…検出ダイオード(7)(8)(9)の動作電圧 となる。前記制御電圧ＶSPは出力抵抗(14)と検出抵抗(1
0)(11)(12)との比によって任意に選らべるが、差動増幅
回路(22)の入力電圧の制限より１５０ｍＶ程度とすれば
よく、出力トランジスタ(13)の動作最低電圧は同じく１
５０ｍＶ程度であり、検出ダイオード(7)(8)(9)の順方
向電圧を０．６Ｖとすれば、 ＶMIN＝０．１５Ｖ＋０．１５Ｖ＋０．６Ｖ＝０．９Ｖ ……(5) となり、０．９Ｖの低電圧で動作させることが出来る。The control voltage V SP is the first, second and third coils (1) (2)
Is added to the base of a speed control transistor (not shown) connected between (3) and the power supply to control the speed control transistor, and the first, second and third coils (1) (2) (3 The number of revolutions can be made constant by increasing or decreasing the voltage supplied to (). By the way, the control voltage V SP is also applied to the base of the first control transistor 16. On the other hand, a constant current flows through the emitter / collector of the first control transistor (16) through the constant current circuit (22), and the first and second control transistors (16) and (17) are connected to the emitter follower, so that control is performed. A control voltage is also generated across the resistor (21). Output resistance (14)
Since the resistance values of the control resistor (21) and the control resistor (21) are equal as described above, the current flowing in the diode (20) is
(7) (8) (9) becomes almost equal to the current flowing, the first, second
If the induced voltage generated in the third coil (1), (2) and (3) is high and the detected current is large, the voltage drop generated in the control resistor (21) together with the control voltage of the output resistor (14) is large, and conversely. When the induced voltage is low and the detection current is small, the voltage generated in the control resistor (21) is lowered together with the control voltage. In this way, the same current that occurs in the detection diodes (7), (8) and (9), the output transistor (13) and the output resistance (14) is connected in series between the power supply and ground, the diode (20) and the second control. Transistor (1
It also occurs in 7) and the control resistor (21). Minimum operating voltage of the circuit (V MIN) is V MIN = V SP + V CE + V F ...... (4) where V CE ... Collector-emitter voltage V F ... detection diode of the output transistor (13) (7) (8 ) It becomes the operating voltage of (9). The control voltage V SP has an output resistance (14) and a detection resistance (1
It can be arbitrarily selected according to the ratio with 0), (11) and (12), but it may be about 150 mV due to the limit of the input voltage of the differential amplifier circuit (22), and the minimum operating voltage of the output transistor (13) is the same. 1
It is about 50 mV, and if the forward voltage of the detection diodes (7) (8) (9) is 0.6V, then V MIN = 0.15V + 0.15V + 0.6V = 0.9V (5) It can be operated at a low voltage of 0.9V.
（ト）発明の効果 本発明のブラシレスモータの誘起電圧検出回路は上述し
た如く、各相のコイルに誘起される誘起電圧を夫々検出
する検出半導体素子に共通の出力トランジスタ及び出力
抵抗を直列に接続し、該出力抵抗に生じる制御電圧にて
制御される制御トランジスタ、前記検出半導体素子と同
一の半導体素子及び出力抵抗と同一抵抗値を有する制御
抵抗とを電源・アース間に直列接続し、さらに差動増幅
回路の第１トランジスタのベースを前記制御トランジス
タのコレクタに接続し、第２トランジスタのベースを前
記検出半導体素子に接続し、前記出力抵抗と制御抵抗と
に流れる電流の大きさが同一になるようにしたので、動
作最低電圧は制御電圧と出力トランジスタ及び検出半導
体素子の最低動作電圧との和のみとなり低くされる。従
って乾電池一本で駆動されるヘッドホンテープレコーダ
に好適である。(G) Effect of the Invention As described above, in the induced voltage detection circuit for a brushless motor of the present invention, a common output transistor and an output resistance are connected in series to a detection semiconductor element that detects an induced voltage induced in each phase coil. The control transistor controlled by the control voltage generated in the output resistance, the same semiconductor element as the detection semiconductor element, and the control resistance having the same resistance value as the output resistance are connected in series between the power supply and ground, and the difference The base of the first transistor of the dynamic amplification circuit is connected to the collector of the control transistor, the base of the second transistor is connected to the detection semiconductor element, and the magnitudes of currents flowing through the output resistor and the control resistor are the same. Since this is done, the minimum operating voltage is lowered only by the sum of the control voltage and the minimum operating voltage of the output transistor and the detection semiconductor element. Therefore, it is suitable for a headphone tape recorder driven by one dry battery.
第１図は本発明のブラシレスモータの誘起電圧検出回路
図、第２図(イ)(ロ)は本発明のブラシレスモータの誘起
電圧検出回路各部の出力波形図である。 (1)(2)(3)……第１、第２、第３コイル、 (4)(5)(6)……第１、第２、第３スイッチングコイル、
(7)(8)(9)……検出ダイオード、 (13)……出力トランジスタ、(14)……出力抵抗、 (15)……制御電圧出力端子、(16)(17)……第１、第２制
御トランジスタ、(21)……制御抵抗、 (22)……差動増幅回路。FIG. 1 is a diagram of an induced voltage detection circuit of a brushless motor of the present invention, and FIGS. 2 (a) and 2 (b) are output waveform diagrams of respective portions of an induced voltage detection circuit of a brushless motor of the present invention. (1) (2) (3) …… first, second, third coils, (4) (5) (6) …… first, second, third switching coils,
(7) (8) (9) …… Detection diode, (13) …… Output transistor, (14) …… Output resistance, (15) …… Control voltage output terminal, (16) (17) …… First , 2nd control transistor, (21) ... control resistor, (22) ... differential amplifier circuit.
Claims (1)
を介し接続され複数の相を構成する数個のコイルと、前
記各コイルに誘起される誘起電圧にて順次オンされる複
数の検出半導体素子と、これら検出半導体素子に直列接
続された共通の出力トランジスタ及び出力抵抗と、該出
力抵抗に生じる制御電圧を取出す制御電圧出力端子と、
コレクタ・エミッタが前記検出半導体素子と同等の半導
体素子及び制御抵抗を介し電源間に接続され前記制御電
圧にて制御される制御トランジスタと、前記制御トラン
ジスタにベースが接続された第１トランジスタ及びベー
スが前記検出半導体素子に接続された第２トランジスタ
とよりなる差動増幅回路とを備え、前記出力抵抗と制御
抵抗との抵抗値を同一にし且つ差動増幅回路の第１トラ
ンジスタのコレクタと出力トランジスタのベースとを接
続したことを特徴とするブラシレスモータの誘起電圧検
出回路。1. A plurality of coils which are connected through switching transistors which are sequentially turned on and which form a plurality of phases, and a plurality of detection semiconductor elements which are sequentially turned on by an induced voltage induced in each coil, and these. A common output transistor and output resistance connected in series to the detection semiconductor element, a control voltage output terminal for extracting a control voltage generated in the output resistance,
A control transistor whose collector / emitter is connected between a power source through a semiconductor element equivalent to the detection semiconductor element and a control resistor and which is controlled by the control voltage, and a first transistor and a base whose bases are connected to the control transistor. A differential amplifier circuit including a second transistor connected to the detection semiconductor element, the output resistance and the control resistance having the same resistance value, and the collector of the first transistor and the output transistor of the differential amplifier circuit. An induced voltage detection circuit for a brushless motor, characterized by being connected to a base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62023125A JPH0648915B2 (en) | 1987-02-03 | 1987-02-03 | Brushless motor induced voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62023125A JPH0648915B2 (en) | 1987-02-03 | 1987-02-03 | Brushless motor induced voltage detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63190588A JPS63190588A (en) | 1988-08-08 |
| JPH0648915B2 true JPH0648915B2 (en) | 1994-06-22 |
Family
ID=12101793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62023125A Expired - Fee Related JPH0648915B2 (en) | 1987-02-03 | 1987-02-03 | Brushless motor induced voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0648915B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006056852A1 (en) * | 2006-12-01 | 2008-06-05 | Robert Bosch Gmbh | detector circuit |
| JP5892601B2 (en) * | 2012-07-05 | 2016-03-23 | 日本電信電話株式会社 | Method for suppressing hydrogen generation on steel surface |
-
1987
- 1987-02-03 JP JP62023125A patent/JPH0648915B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63190588A (en) | 1988-08-08 |
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