JPS5936520B2 - brushless motor - Google Patents
brushless motorInfo
- Publication number
- JPS5936520B2 JPS5936520B2 JP50155062A JP15506275A JPS5936520B2 JP S5936520 B2 JPS5936520 B2 JP S5936520B2 JP 50155062 A JP50155062 A JP 50155062A JP 15506275 A JP15506275 A JP 15506275A JP S5936520 B2 JPS5936520 B2 JP S5936520B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- back electromotive
- switching
- phase
- commutation control
- 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
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- Control Of Motors That Do Not Use Commutators (AREA)
Description
【発明の詳細な説明】
本発明は駆動巻線に発生する逆起電圧によつて界磁ロー
タの回転位置を検出する形式のブラシレスモータに関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brushless motor that detects the rotational position of a field rotor based on a back electromotive force generated in a drive winding.
一般にブラシレスモータでは永久磁石等で構成した界磁
ロータの回転位置を磁気あるいは光などを媒体として無
接触で検出し、これによつて駆動巻線の電流を転流する
ものが多い。In general, in many brushless motors, the rotational position of a field rotor made of permanent magnets or the like is detected without contact using a medium such as magnetism or light, and the current in the drive winding is thereby commutated.
しかしモータの使用条件によつては、この種の検出器を
用いず、外部同期信号によつて同期モータとしτ起動さ
せ、一定回転速度に達したあと、駆動巻線に発生する逆
起電圧によりロータの回転位置を検出し、これによつて
駆動電流の転流を行なう形式のものに利点のある場合が
ある。しかしこの形式のブラシレスモータの問題点の一
つは、同期信号による回転状態から逆起電圧信号による
回転状態への切換えを行なう過渡状態において、負荷状
態その他の外乱によつて不安定状態が発生し、モータが
脱調停止してしまうことにある。本発明の目的は、この
ような問題点を除去し。However, depending on the operating conditions of the motor, this type of detector may not be used, and the motor may be started as a synchronous motor using an external synchronizing signal, and after reaching a certain rotation speed, the back electromotive force generated in the drive winding may There may be advantages in detecting the rotational position of the rotor and commutating the drive current accordingly. However, one of the problems with this type of brushless motor is that during the transient state in which the rotation state is switched from the rotation state caused by the synchronization signal to the rotation state caused by the back electromotive voltage signal, an unstable state may occur due to load conditions or other disturbances. , the motor may step out and stop. The object of the present invention is to eliminate such problems.
且つ負荷条件の如何にかかわらず、きわめて高速な同期
起動を可能とし、短時間のうちに逆起電圧による定常回
転状態を達成するブラシレスモータを提供することにあ
る。以下本発明の基本原理について第１図、第２図およ
び第３図を用いて説明する。Another object of the present invention is to provide a brushless motor that enables extremely high-speed synchronous starting regardless of load conditions and achieves a steady rotation state due to a back electromotive force in a short time. The basic principle of the present invention will be explained below with reference to FIGS. 1, 2, and 3.
第１図は逆起電圧検出形のブラシレスモータの基本構成
である。１は界磁ロータで、３相の駆動巻線３−ａ、３
一ｂ、３−ｃの電流が、駆動電源２の出力電流をコミュ
テータ素子４−ａ、４−ｂ、４−ｃおよび５−ａ、５−
ｂ、５−ｃを用いて、界磁ロータ１の回転位置に応じて
転流されることによつてモータの回転が持続する。FIG. 1 shows the basic configuration of a back electromotive force detection type brushless motor. 1 is a field rotor, and three-phase drive windings 3-a, 3
The currents of 1b and 3-c change the output current of the drive power source 2 to commutator elements 4-a, 4-b, 4-c and 5-a, 5-
b and 5-c are used to commutate the current according to the rotational position of the field rotor 1, thereby maintaining the rotation of the motor.
トランジスタ６−Ａ，６− Ｂ，６−ｃはコミユテータ
素子４ − Ａ，４− Ｂ，４−ｃのプリドライバ一で
あり、ダイオードヨ黷，？− Ｂ，７− ｃおよび８−
Ａ，８−Ｂ，８−ｃは各々コミユテータ素子４− Ａ，
４− Ｂ，４−ｃおよび５−Ａ，５−Ｂ，５−ｃに並列
に接続された環流ダイオードである。第１図において１
３は同期信号および逆起電圧検出信号の切換，スイツチ
．１５はこれらの信号のうち切換スイツチ１３によつて
選択された３相信号２４− Ａ，２４− Ｂ，２４−ｃ
を．６相のコミユテータ素子転流制御信号２５−Ａ，２
５−Ｂ，２５−Ｃ，２６−Ａ，２６− Ｂ，２６− ｃ
に変換するロジツク回路である。起動時においては、王
モータを同期モータとして駆動するための発振器１１の
出力信号２Ｔをシフトレジスタ１２によつて３相に変換
した同期信号２３−Ａ，２３−Ｂ，２３−ｃが切換スイ
ツチ１３によつて選択される。この切換スイツチ１３に
よつて選択された同期信号２３−Ａ，２３− Ｂ，２３
− ｃによつてモータの界磁ロータが起動加速し．駆動
巻線３− Ａ，３− Ｂ，３− ｃに発生する逆起電圧
信号２０−Ａ，２Ｏ−Ｂ，２Ｏ−ｃが回転位置検出に利
用するのに十分なレベルになると、指令回路１４による
切換信号２８が発生し．これによつて切換スイツチ１３
は逆起電圧検出信号２２−Ａ，２２−Ｂ，２２−ｃを選
択し、界磁ロータ１は定常回転状態となる。逆起電圧信
号２０− Ａ，２Ｏ− Ｂ，２Ｏ− ｃを同期信号２３
− Ａ，２３− Ｂ，２３− ｃと対等な逆起電圧検出
信号２２− Ａ，２２− Ｂ，２２− ｃに変更するた
めに、フイルタ回路９およびコンパレータ１０が配置さ
れている。Transistors 6-A, 6-B, 6-c are pre-drivers for commutator elements 4-A, 4-B, 4-c, and diodes are connected to each other. -B, 7-c and 8-
A, 8-B, and 8-c are commutator elements 4-A, respectively.
It is a freewheeling diode connected in parallel to 4-B, 4-c and 5-A, 5-B, 5-c. In Figure 1, 1
3 is a switch for switching the synchronization signal and back electromotive voltage detection signal. 15 is a three-phase signal 24-A, 24-B, 24-c selected by the changeover switch 13 among these signals.
of. 6-phase commutator element commutation control signal 25-A, 2
5-B, 25-C, 26-A, 26-B, 26-c
It is a logic circuit that converts At startup, synchronous signals 23-A, 23-B, and 23-c, which are obtained by converting the output signal 2T of the oscillator 11 into three phases by the shift register 12 for driving the main motor as a synchronous motor, are sent to the changeover switch 13. selected by. Synchronous signals 23-A, 23-B, 23 selected by this switch 13
- The field rotor of the motor is started and accelerated by c. When the back electromotive voltage signals 20-A, 2O-B, 2O-c generated in the drive windings 3-A, 3-B, 3-c reach a sufficient level to be used for rotational position detection, the command circuit 14 A switching signal 28 is generated by . This causes the changeover switch 13
selects the back electromotive voltage detection signals 22-A, 22-B, and 22-c, and the field rotor 1 enters a steady rotation state. The back electromotive voltage signals 20-A, 2O-B, 2O-c are used as the synchronization signal 23
A filter circuit 9 and a comparator 10 are arranged to change the back electromotive voltage detection signals 22-A, 22-B, and 22-c to be equal to those of the signals 22-A, 23-B, and 23-c.
その動作原理は、本出願人が本願と同日付で出願した判
願昭５０一１５５０６１号にても述べたが、第２図のと
おりである。即ち、第２図において各相の逆起電圧信号
２０− Ａ，２Ｏ− ｂおよび２０−ｃは各々電気角で
１２０゜の位相差を持つて発生する。例えば．このうち
のｂ相の逆起電圧信号２０−ｂをフイルタ回路９に入力
すれば、その出力は２１−ｂに示したように．原信号の
逆起電圧信号２０−ｂに対し９０゜遅れの正弦波電圧信
号となる。これをコンパレータ１０に入力すれば． ２
２−ａに示したようにａ相のための逆起電圧検出信号と
なる。同様にｂおよびｃ相のための逆起電圧検出信号は
それぞれｃおよびａ相の逆起電圧信号２０−Ｃ，２Ｏ−
ａによつて形成できる。これら１８０幅かつ１２０位相
差の３相信号が第１図のロジツク１５によつて、第２図
に示した転流制御信号２６−Ａ，２６−Ｂ，２６−ｃお
よび２５−Ａ，２５−Ｂ，２５−ｃに形成される。これ
らのうち転流制御信号２６− Ａ，２６− Ｂ，２６−
ｃは第１図のコミユテータ４−Ａ，４−Ｂ，４−Ｃ，
また転流制御信号２５− Ａ，２５− Ｂ，２５−ｃは
コミユテータ５−Ａ，５−Ｂ，５−ｃを制御するのに利
用される。このように逆起電圧を利用した回転状態にお
いては、ロータの回転位置に対応した転流制御信号２５
−Ａ，２５−Ｂ，２５−Ｃ，２６−Ａ，２６− Ｂ，２
６− ｃが得られるのに対し．同期信号２３− Ａ，２
３− Ｂ，２３− ｃによる回転状態においては、同期
信号２３−Ａ，２３−Ｂ，２３−ｃを利用した転流制御
信号２５−Ａ，２５−Ｂ，２５− Ｃ，２６− Ａ，２
６− Ｂ，２６−ｃとロータ１の回転位置との関係が一
定である保証が与えられない。The principle of its operation is as shown in FIG. 2, as described in Japanese Patent Application No. 155061/1983 filed by the applicant on the same date as the present application. That is, in FIG. 2, the back electromotive voltage signals 20-A, 2O-b and 20-c of each phase are generated with a phase difference of 120 degrees in electrical angle. for example. If the b-phase back electromotive voltage signal 20-b is input to the filter circuit 9, its output will be as shown in 21-b. This becomes a sine wave voltage signal delayed by 90 degrees with respect to the original back electromotive voltage signal 20-b. Input this to comparator 10. 2
As shown in 2-a, this becomes a back electromotive force detection signal for the a phase. Similarly, the back electromotive force detection signals for the b and c phases are the back electromotive voltage signals 20-C and 2O- for the c and a phases, respectively.
It can be formed by a. These three-phase signals with a width of 180 and a phase difference of 120 are converted into commutation control signals 26-A, 26-B, 26-c and 25-A, 25- as shown in FIG. B, formed at 25-c. Among these, commutation control signals 26-A, 26-B, 26-
c is the commutator 4-A, 4-B, 4-C in Fig. 1,
Further, commutation control signals 25-A, 25-B, and 25-c are used to control commutators 5-A, 5-B, and 5-c. In this rotating state using the back electromotive force, the commutation control signal 25 corresponding to the rotational position of the rotor is
-A, 25-B, 25-C, 26-A, 26-B, 2
6- While c is obtained. Synchronous signal 23-A, 2
3-B, 23-c, commutation control signals 25-A, 25-B, 25-C, 26-A, 2 using synchronization signals 23-A, 23-B, 23-c.
There is no guarantee that the relationship between 6-B, 26-c and the rotational position of the rotor 1 is constant.
これを第３図によつて説明する。第３図において２３−
ａはａ相のための同期信号であり、これと対の相の同期
信号２３−ｂによつてロジツク１５により転流制御信号
２６− ａおよび２５−ａが形成される。このとき、ロ
ータの回転位置を示す逆起電圧信号２０−ａは第３図に
示すように転流制御信号２６− Ａ，２５− ａより位
相進みの状態にあるのが普通である。（このように．位
相進みの状態、即ち、転流制御信号２６− Ａ，２５−
ａによる逆起電圧信号２０−ａに対する転流位置が位
相ずれを起しているため．実際に端子電圧として取り出
した逆起電圧信号２０−ａは非対称となり、破線のよう
になる。）このとき、逆起電圧にもとずく逆起電圧検出
信号は２２−ａのようになり、同期信号２３−ａに対し
αだけ位相が進んでいる。このような位相ずれがあると
き．たとえば第３図のＴ。のタイミングで同期信号から
逆起電圧検出信号に切換えると．２０−ａが進み位相で
あるため．正常な転流制御信号２５−ａが発生せず転流
制御信号２５− ａ’が生じてしまう。従つて．転流制
御信号２６−ａと２５−ａとの正常な位相間隔が確保で
きず、前記転流制御信号２５−ａ’は、転流制御信号２
６− ａ’との位相間隔が小さくなり、実際の回転子の
位置を与える情報信号とならない。他の相についても同
様であるため、このような切換えを行なうと駆動電流の
適正な転流状態が得られず、瞬時にモータが脱調停止す
ることがある。脱調しない場合でも、コミユテータ素子
４−Ａ，４−Ｂ，４−Ｃ，５−Ａ，５−Ｂ，５−ｃに過
大な電流が流れ、これを損傷する。一方、同期信号にも
とづく回転状態においても、負荷が軽くなると、界磁ロ
ータ１の位相進み状態、すなわち第３図のαが小さくな
つて、第３図の逆起電圧信号２０−ａ′の状態に近づい
ていく。This will be explained with reference to FIG. In Figure 3, 23-
A is a synchronization signal for the a phase, and commutation control signals 26-a and 25-a are formed by the logic 15 based on the synchronization signal 23-b of the opposite phase. At this time, the back electromotive voltage signal 20-a indicating the rotational position of the rotor is normally in a phase lead state than the commutation control signals 26-A and 25-a, as shown in FIG. (In this way, the phase lead state, that is, the commutation control signal 26-A, 25-
This is because the commutation position with respect to the back electromotive voltage signal 20-a due to a has caused a phase shift. The back electromotive voltage signal 20-a actually taken out as a terminal voltage is asymmetrical and appears as a broken line. ) At this time, the back electromotive voltage detection signal based on the back electromotive force becomes as shown in 22-a, which is ahead in phase by α with respect to the synchronizing signal 23-a. When there is such a phase shift. For example, T in Figure 3. If you switch from the synchronization signal to the back electromotive voltage detection signal at the timing of . Because 20-a is a leading phase. A normal commutation control signal 25-a is not generated, but a commutation control signal 25-a' is generated. Accordingly. A normal phase interval between the commutation control signals 26-a and 25-a cannot be ensured, and the commutation control signal 25-a' is different from the commutation control signal 2.
6- The phase interval with a' becomes small and the information signal does not provide the actual position of the rotor. The same applies to the other phases, so if such switching is performed, an appropriate commutation state of the drive current cannot be obtained, and the motor may instantly step out and stop. Even if no synchronization occurs, an excessive current flows through the commutator elements 4-A, 4-B, 4-C, 5-A, 5-B, and 5-c, damaging them. On the other hand, even in the rotating state based on the synchronization signal, when the load becomes lighter, the phase advance state of the field rotor 1, that is, α in FIG. 3 becomes smaller, and the state of the back electromotive voltage signal 20-a' in FIG. approaches.
このとき逆起電圧検出信号は２２−ａ／０）ごとくであ
り、同期信号２３−ａと一致する。このような状態をと
らえて切換を行なうならば、上記の問題点が除去される
であろう。本発明の基本的な考え方は、この点に着目し
たものである。At this time, the back electromotive voltage detection signal is as shown in 22-a/0), which coincides with the synchronizing signal 23-a. If such a situation is detected and switching is performed, the above-mentioned problem will be eliminated. The basic idea of the present invention focuses on this point.
すなわち、同期信号と逆期電圧検出信号の位相差に着目
し、この位相差を零もしくは切換時にトラブルが生じぬ
範囲内の零近くに制御することによつて、同期信号によ
る回転状態から逆起電圧による回転状態への切換えを円
滑かつ安定に行なわしめることである。以下に本発明の
内容について、第４図および第５図により、位相差検出
方式の一実施例を説明する。第４図において２２−Ａ，
２２−ｂおよび２２−ｃは逆起電圧をもとに形成した逆
起電圧検出信号である。一方２３−ａはａ相のための同
期信号であり、逆起電圧検出信号２２−ａとの論理比較
により２９の実線のパルス幅信号を得る。このパルス幅
信号２９はそのパルス幅が界磁ロータの位相進みに比例
する゛。しかし、このままでは、逆に同期信号２３一ａ
が相対的に位相進みになつた瞬間にもパルス幅信号２９
が発生してしまう。このため第５図の論理回路１６−ａ
に示したように、２２−ｂの反転信号を論理にカロえる
。これによつて位相差零を基準として、界磁ロータ１が
位相進みのとき、これに比例したパルス幅信号２９、位
相遅れのときにパルス発生なしの条件が一定限界内で可
能となる。各位相についても同様にし、これを第５図の
論理回路１７−ａで結合すれば、そのパルス幅信号２９
は第４図の実線および破線で示すような信号になる。一
方、界磁ロータの位相が遅れた状態にあり、同期信号が
第４図２３−ａ′０状態となつたときは、前と同様に第
５図の論理回路１６−ｄおよび論理回路１７−ｂにより
、第４図３０の位相遅れを示すパルス幅信号が得られる
。これらのパルス幅信号２９および３０を各々フイルタ
１８−Ａ，ｌ８−ｂによつて平滑し、これを差動アンプ
１９に印カロしたとき、その出力３２は界磁ロータすな
わち回転信号の同期信号に対する位相差を示す直流信号
となる。出力３２は位相進みで正の電圧、位相遅れで負
の電圧、位相差なしで零電圧となるので、この零もしく
は零近くの電圧値を検出して第１図の指令回路１４を動
作させて切換信号２８を発生せしめることにより同期信
号と逆起電圧検出信号の位相が合つた安定な切換を実現
することができる。In other words, by focusing on the phase difference between the synchronization signal and the reverse voltage detection signal, and controlling this phase difference to zero or close to zero within a range that does not cause trouble during switching, the rotation state caused by the synchronization signal can be eliminated from the reverse voltage detection signal. The purpose is to smoothly and stably switch to a rotating state using voltage. Regarding the content of the present invention, one embodiment of the phase difference detection method will be described below with reference to FIGS. 4 and 5. In Fig. 4, 22-A,
22-b and 22-c are back electromotive voltage detection signals formed based on the back electromotive force. On the other hand, 23-a is a synchronization signal for the a phase, and a solid line pulse width signal 29 is obtained by logical comparison with the back electromotive voltage detection signal 22-a. The pulse width of this pulse width signal 29 is proportional to the phase lead of the field rotor. However, as it is, the synchronization signal 231a
Even at the moment when the phase becomes relatively advanced, the pulse width signal 29
will occur. Therefore, the logic circuit 16-a in FIG.
As shown in , the inverted signal of 22-b is added to the logic. This makes it possible within certain limits to generate a pulse width signal 29 proportional to the phase difference of the field rotor 1 when the phase difference is zero, and to generate no pulse when the field rotor 1 has a phase lag. Do the same for each phase, and if they are combined in the logic circuit 17-a in FIG. 5, the pulse width signal 29
results in signals as shown by solid lines and broken lines in FIG. On the other hand, when the phase of the field rotor is delayed and the synchronization signal is in the state 23-a'0 in FIG. 4, the logic circuit 16-d and the logic circuit 17- in FIG. b, a pulse width signal indicating a phase delay as shown in FIG. 430 is obtained. When these pulse width signals 29 and 30 are smoothed by filters 18-A and 18-b, respectively, and applied to the differential amplifier 19, the output 32 is generated in response to the synchronization signal of the field rotor, that is, the rotation signal. This becomes a DC signal that indicates a phase difference. Since the output 32 is a positive voltage when the phase is advanced, a negative voltage when the phase is delayed, and zero voltage when there is no phase difference, this voltage value of zero or near zero is detected and the command circuit 14 shown in FIG. 1 is operated. By generating the switching signal 28, stable switching in which the synchronization signal and the back electromotive force detection signal are in phase can be realized.
第６図は以上説明した本発明により、実際のモータを起
動した際のカロ速特件の一例を示すものである。切換時
の速度は２９０〜３７０（Ｒｐｍ）であり、起動から切
換までの時間は約２．６秒である。なお、図の斜線部分
が安定して切換えられる回転数の範囲である。以上説明
したように本発明によれば同期信号から逆起電圧検出信
号への切換が円滑に行なわれ、きわめて安定な逆起電圧
検出形ブラシレスモータの実現が可能である。FIG. 6 shows an example of the Karo speed special condition when an actual motor is started according to the present invention described above. The speed at the time of switching is 290 to 370 (Rpm), and the time from startup to switching is about 2.6 seconds. Note that the shaded area in the figure is the range of rotation speeds that can be stably switched. As described above, according to the present invention, switching from a synchronization signal to a back electromotive force detection signal is performed smoothly, and an extremely stable back electromotive force detection type brushless motor can be realized.
なお、本発明は逆起電圧検出形のブラシレスモータの構
成方式あるいは構成素子の種類には無関係に適用可能で
ある。It should be noted that the present invention is applicable regardless of the configuration method or the types of constituent elements of the back electromotive force detection type brushless motor.
第１図，第２図および第３図は本発明の基本原理を説明
する図、第４図および第５図は本発明の実現に必要な位
相検出方式の一実施例の説明図、第６図は本発明による
カロ速特性の一例を示す図である。
４−Ａ，４−Ｂ，４−Ｃ，５−Ａ，５−Ｂ，５一ｃ・・
・・・・コミユテータ素子、６−Ａ，６−Ｂ，６一ｃ・
・・・・・コミユテータ素子のプリドライバ一用のトラ
ンジスタ、９・・・・・・フイルタ回路、１０・・・・
・・コンパレータ、１１・・・・・・発振器、１２・・
・・・・シフトレジスタ、１３・・・・・・切換スイツ
チ、１４・・・・・・指令回路、１５・・・・・・ロジ
ツク回路、１６−Ａ，ｌ６−Ｂ，ｌ６−Ｃ，ｌ７−Ａ，
ｌ７−Ｂ，ｌ７−ｃ・・・・・・論理回路、１８−Ａ，
ｌ８−ｂ・・・・・・フイルタ、１９・・・・・・差動
アンプ。1, 2, and 3 are diagrams for explaining the basic principle of the present invention, Figures 4 and 5 are diagrams for explaining an embodiment of the phase detection method necessary for realizing the present invention, and Figure 6 is a diagram for explaining the basic principle of the present invention. The figure is a diagram showing an example of Karo speed characteristics according to the present invention. 4-A, 4-B, 4-C, 5-A, 5-B, 5-c...
... Commutator element, 6-A, 6-B, 61c.
... Transistor for pre-driver of commutator element, 9 ... Filter circuit, 10 ...
... Comparator, 11... Oscillator, 12...
...Shift register, 13...Selector switch, 14...Command circuit, 15...Logic circuit, 16-A, l6-B, l6-C, l7 -A,
l7-B, l7-c...Logic circuit, 18-A,
l8-b...Filter, 19...Differential amplifier.
Claims (1)
流れる駆動電流を切換えるためのコミユテータ素子を有
するとともに、外部同期信号にもとづく転流制御装置に
よつて前記コミユテータ素子のオンオフ状態を変化させ
て前記ロータを起動し、これが一定回転速度に達したの
ち、前記駆動巻線に発生した逆起電圧信号にもとづく転
流制御信号によつて前記コミユテータ素子のオンオフ状
態を変化させながら定常運転させる形式のブラシレスモ
ータにおいて、起動後、時間の経過と共に周波数が増加
する外部同期信号発振器と、該外部同期信号発振器より
出力される同期信号またはこの同期信号と一定位相関係
にある処理信号と前記逆起電圧信号またはこの逆起電圧
信号と一定位相関係にある処理信号との位相差を検出す
る位相差検出器と、この位相差検出器で検出された位相
差が零もしくは零近くのときに前記同期信号によるモー
タ運転から前記逆起電圧信号によるモータ運転に切換え
る切換信号を発生する切換器とからなる起動装置を有す
るブラシレスモータ。1. It has a field rotor, a plurality of drive windings, and a commutator element for switching the drive current flowing through the drive windings, and the on/off state of the commutator element is controlled by a commutation control device based on an external synchronization signal. After the rotor reaches a constant rotational speed, steady operation is performed while changing the on/off state of the commutator element using a commutation control signal based on a back electromotive voltage signal generated in the drive winding. In a brushless motor of the type that operates, an external synchronizing signal oscillator whose frequency increases over time after startup, and a synchronizing signal output from the external synchronizing signal oscillator or a processed signal having a constant phase relationship with this synchronizing signal and the opposite a phase difference detector that detects a phase difference between an electromotive force signal or a processed signal that has a constant phase relationship with the back electromotive force signal; A brushless motor having a starting device comprising a switching device that generates a switching signal for switching from motor operation based on a synchronization signal to motor operation based on the counter electromotive voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50155062A JPS5936520B2 (en) | 1975-12-26 | 1975-12-26 | brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50155062A JPS5936520B2 (en) | 1975-12-26 | 1975-12-26 | brushless motor |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59027050A Division JPS59162793A (en) | 1984-02-17 | 1984-02-17 | Brushless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5280414A JPS5280414A (en) | 1977-07-06 |
| JPS5936520B2 true JPS5936520B2 (en) | 1984-09-04 |
Family
ID=15597824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50155062A Expired JPS5936520B2 (en) | 1975-12-26 | 1975-12-26 | brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5936520B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991012655A1 (en) * | 1990-02-14 | 1991-08-22 | Matsushita Electric Industrial Co., Ltd. | Method of driving brushless motor and device therefor |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5642842U (en) * | 1979-09-10 | 1981-04-18 | ||
| JPS5646680A (en) * | 1979-09-20 | 1981-04-27 | Yoshida Dental Mfg Co Ltd | Brushless motor driving system |
| JPS57145560A (en) * | 1981-02-27 | 1982-09-08 | Seiko Instr & Electronics Ltd | Brushless motor |
| JPS5829380A (en) * | 1981-08-14 | 1983-02-21 | Hitachi Ltd | Starting method for commutatorless motor |
| JPS5851794A (en) * | 1981-09-21 | 1983-03-26 | Nippon Yusoki Co Ltd | Starting system for commutatorless motor |
| JPS5854891A (en) * | 1981-09-25 | 1983-03-31 | Secoh Giken Inc | Driving device for semiconductor motor |
| JPS60118087A (en) * | 1983-11-28 | 1985-06-25 | Secoh Giken Inc | Semiconductor motor |
| JPS60128888A (en) * | 1983-12-12 | 1985-07-09 | Secoh Giken Inc | Semiconductor motor with 1-phase position detection output unit |
| JPS61135385A (en) * | 1984-12-04 | 1986-06-23 | Matsushita Electric Ind Co Ltd | Brushless motor drive device |
| JPS61135380A (en) * | 1984-12-04 | 1986-06-23 | Matsushita Electric Ind Co Ltd | Brushless motor drive device |
| JPS61135379A (en) * | 1984-12-04 | 1986-06-23 | Matsushita Electric Ind Co Ltd | Brushless motor drive device |
-
1975
- 1975-12-26 JP JP50155062A patent/JPS5936520B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991012655A1 (en) * | 1990-02-14 | 1991-08-22 | Matsushita Electric Industrial Co., Ltd. | Method of driving brushless motor and device therefor |
| DE4190247C2 (en) * | 1990-02-14 | 1994-05-26 | Matsushita Electric Ind Co Ltd | Method of operating a brushless motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5280414A (en) | 1977-07-06 |
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