JPS5918876Y2 - Control device for brushless DC motor - Google Patents
Control device for brushless DC motorInfo
- Publication number
- JPS5918876Y2 JPS5918876Y2 JP1976117462U JP11746276U JPS5918876Y2 JP S5918876 Y2 JPS5918876 Y2 JP S5918876Y2 JP 1976117462 U JP1976117462 U JP 1976117462U JP 11746276 U JP11746276 U JP 11746276U JP S5918876 Y2 JPS5918876 Y2 JP S5918876Y2
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- position detection
- coil
- magnet
- rotor magnet
- 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
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【考案の詳細な説明】
本考案は回転子位置検出として位置検出コイルを用いた
無刷子直流電動機の制御装置に関する。[Detailed Description of the Invention] The present invention relates to a control device for a brushless DC motor that uses a position detection coil to detect the rotor position.
この種従来装置として交流電源にトランスの１次コイル
を接続すると共にその２次コイルを、固定子巻線を通電
制御するトランジスタのベース回路に接続し、回転軸に
取付けた磁性板が前記両コイル間に介在するか否かによ
り２次コイル出力の発生で回転子位置を検出するもので
ある。In a conventional device of this kind, the primary coil of a transformer is connected to an AC power supply, and the secondary coil is connected to the base circuit of a transistor that controls energization of the stator winding. The rotor position is detected based on the generation of a secondary coil output depending on whether or not there is a secondary coil between the coils.
この装置において正転位置及び逆転位置を検出する場合
には前記両コイルを夫々２組設け、２次コイルを選択的
に前記ベース回路に接続するものである。In this device, when detecting a forward rotation position and a reverse rotation position, two sets of both coils are provided, and a secondary coil is selectively connected to the base circuit.
ところがこの装置においては両コイル間の磁気結合の変
化を検出するものであるため、コイル個数が多いと共に
両コイル間の相対的配置及び両コイルと磁性板との配置
を考慮せねばならず、回転子位置の検出効率が悪い欠点
がある。However, since this device detects changes in the magnetic coupling between both coils, the number of coils is large, and the relative arrangement between both coils and the arrangement of both coils and the magnetic plate must be considered. The disadvantage is that the child position detection efficiency is poor.
そこで回転子磁石の一方向の磁束の有無によりインピー
ズダンス値が変化する位置検出コイルとインピーダンス
素子との直列回路を交流電源に接続し、位置検出コイル
又はインピーダンス素子の電圧を、固定子巻線を通電制
御するトランジスタのベースに印加することにより前記
従来装置の欠点を解消することができる。Therefore, a series circuit of a position detection coil and an impedance element whose impedance value changes depending on the presence or absence of magnetic flux in one direction of the rotor magnet is connected to an AC power supply, and the voltage of the position detection coil or impedance element is applied to the stator winding. By applying current to the base of the transistor that controls conduction, the drawbacks of the conventional device can be overcome.
この場合に回転方向を正逆に切換えるには、前記トラン
ジスタのベースに印加する電圧を、位置検出コイル電圧
とインピーダンス素子電圧との間で切換えるようにすれ
ばよい。In this case, in order to switch the rotation direction between forward and reverse, the voltage applied to the base of the transistor may be switched between the position detection coil voltage and the impedance element voltage.
ところが前記直列回路の中間点を前記トランジスタのベ
ースに接続する場合には交流電源に対する直列回路の接
続を２極スイツチで切換えねばならず、スイッチ回路が
複雑になる欠点がある。However, when the intermediate point of the series circuit is connected to the base of the transistor, the connection of the series circuit to the AC power source must be changed by a two-pole switch, which has the drawback of complicating the switch circuit.
本考案はかかる点に鑑み考案されたものにして以下本考
案の一実施例を図面に基いて説明する。The present invention has been devised in view of these points, and one embodiment of the present invention will be described below with reference to the drawings.
まず本考案を適用することができる制御回路を第１図に
基いて説明する。First, a control circuit to which the present invention can be applied will be explained based on FIG.
１，２は直流電源端子、３．４は正負の給電ラインであ
る。1 and 2 are DC power supply terminals, and 3.4 are positive and negative power supply lines.
５． ６． ７は各固定子巻線にして、各一端は負ライ
ン４に、又他端は夫々スイッチトランジスタ８．９．１
０及び共通エミッタ抵抗１１を介して正ライン３に接続
される。5. 6. 7 is each stator winding, one end of each is connected to the negative line 4, and the other end is connected to a switch transistor 8.9.1, respectively.
0 and the positive line 3 via a common emitter resistor 11.
各スイッチトランジスタのベースには異形の制御トラン
ジスタ１２．１３．１４が接続され、この制御トランジ
スタの導通により対応するスイッチトランジスタが導通
するようになされている。A irregularly shaped control transistor 12, 13, 14 is connected to the base of each switch transistor, and conduction of this control transistor causes the corresponding switch transistor to conduct.
これらの各制御トランジスタは夫々抵抗１５．１６゜１
７を介して正負ライン３，４間に接続される。Each of these control transistors has a resistance of 15.16°1.
7 between the positive and negative lines 3 and 4.
次に１８は高周波電源１９に接続された出力コイルにし
てその一端は、正負ライン３，４間に直列接続された一
対の抵抗２０．２１の中間接続点２２に接続される。Next, 18 is an output coil connected to a high frequency power source 19, and one end thereof is connected to an intermediate connection point 22 of a pair of resistors 20 and 21 connected in series between the positive and negative lines 3 and 4.
この中間接続点２２と出力コイル１８の他端間には、各
固定巻線に対応した直列回路２３、２４．２５が並列接
続されている。Between this intermediate connection point 22 and the other end of the output coil 18, series circuits 23, 24, 25 corresponding to each fixed winding are connected in parallel.
この直列回路は夫々回転子磁石の一方向の磁束の有無に
よりインピーダンス値が変化する２個の位置検出コイル
２６、２７．２８．２９．３０．３１を選択的にインピ
ーダンス素子としての抵抗３２に切換接続するスイッチ
３３、３４．３５を含み、各直列回路の中間点３６．３
７゜３８は夫々対応する制御トランジスタ１２．１３．
１４のベースに接続される。This series circuit selectively switches two position detection coils 26, 27, 28, 29, 30, and 31, whose impedance values change depending on the presence or absence of magnetic flux in one direction of the rotor magnet, to a resistor 32 as an impedance element. midpoint 36.3 of each series circuit, including switches 33, 34.35 to connect
7°38 are the corresponding control transistors 12, 13, .
Connected to 14 bases.
前記位置検出コイルは第２図イ示すように夫々磁気バイ
アス用磁石３９を有する磁性ボビン４０に巻回され、第
３図に示す如く取付けられる。The position detection coils are wound around magnetic bobbins 40 each having a magnetic bias magnet 39 as shown in FIG. 2A, and attached as shown in FIG. 3.
即ち一対の位置検出コイル２６．２７．２８．２９．３
０．３１は夫々非磁性材ホルダ４１に収納され、このホ
ルダは有底筒状の固定子ケース４２の底面に等間隔に取
付けられる。That is, a pair of position detection coils 26.27.28.29.3
0.31 are housed in non-magnetic material holders 41, respectively, and these holders are attached to the bottom surface of a stator case 42 having a cylindrical shape with a bottom at equal intervals.
この場合に各位置検出コイルは回転子磁石４３の端面に
空隙を介して対抗し、且一対の位置検出コイルの一方２
６．２８．３０は回転子磁石４３の内周縁対抗位置に、
又他方２７．２９．３１は外周縁対抗位置に夫々配置さ
れる。In this case, each position detection coil opposes the end face of the rotor magnet 43 with a gap in between, and one of the pair of position detection coils 2
6.28.30 is located opposite the inner peripheral edge of the rotor magnet 43,
The other portions 27, 29, and 31 are respectively arranged at positions facing the outer periphery.
即ち各位置検出コイルと回転子磁石４３との配置関係は
第４図のようになる。That is, the arrangement relationship between each position detection coil and the rotor magnet 43 is as shown in FIG.
尚第３図において、固定子ケース４２にはスリーブ４４
が固定され、このスリーブ内には軸受４５が収納され、
又外周には固定子巻線５を巻装した固定子鉄心４６が固
着される。In FIG. 3, the stator case 42 has a sleeve 44.
is fixed, a bearing 45 is housed within this sleeve,
Further, a stator core 46 around which the stator winding 5 is wound is fixed to the outer periphery.
一方回転子磁石４３は回転子４７のケース４８に取付け
られ、回転軸４９に固着される。On the other hand, the rotor magnet 43 is attached to the case 48 of the rotor 47 and fixed to the rotating shaft 49.
而して第２図イにおいて位置検出コイル２６．２７の磁
気バイアス用磁石３９が図示極性のとき、位置検出コイ
ル２６．２７に回転子磁石４３のＮ極が近接する場合に
は、回転子磁石４３からの磁束φ１とバイアス用磁石３
９の磁束ムが逆方向で打ち消し合うため、磁性ボビン４
０は未飽和状態となり、透磁率が高くインダクタンスが
大きくなる。In FIG. 2A, when the magnetic bias magnet 39 of the position detection coil 26.27 has the polarity shown, if the N pole of the rotor magnet 43 is close to the position detection coil 26. Magnetic flux φ1 from 43 and bias magnet 3
Since the magnetic fluxes of 9 cancel each other out in opposite directions, the magnetic bobbin 4
0 is an unsaturated state, and the magnetic permeability is high and the inductance is large.
従って位置検出コイルのインピーダンス値が大きく、そ
の両端電圧が大きくなる。Therefore, the impedance value of the position detection coil is large, and the voltage across it becomes large.
また逆に位置検出コイル２６、２７に回転子磁石４３の
Ｓ極が近接する場合には、回転子磁石４３からの磁束φ
２とバイアス用磁石３９の磁束φ。Conversely, when the S pole of the rotor magnet 43 is close to the position detection coils 26 and 27, the magnetic flux φ from the rotor magnet 43
2 and the magnetic flux φ of the bias magnet 39.
が加わり、磁性ボビン４０は飽和状態となり位置検出コ
イルの両端電圧が小さくなる。, the magnetic bobbin 40 becomes saturated and the voltage across the position detection coil becomes small.
この状態を第２図口に示す。次にスイッチ３３．３４．
３５が夫々端子ａに位置し、回転子磁石４３が第４図状
態にあるとすると、位置検出コイル３０．２６の電圧が
大となり、対応する固定子巻線７，５が励磁され、回転
子４７を時計方向に回転する。This state is shown in Figure 2. Next, switch 33.34.
35 are located at terminal a, and the rotor magnets 43 are in the state shown in FIG. 47 clockwise.
すると位置検出コイル２６のみその電圧が大となり、固
定子巻線５の励磁により、固定子４７をさらに時計方向
に回転する。Then, only the voltage of the position detection coil 26 increases, and the stator winding 5 is energized to further rotate the stator 47 in the clockwise direction.
続いて位置検出コイル２６．２８の両端電圧が大きくな
る。Subsequently, the voltage across the position detection coils 26 and 28 increases.
このようにスイッチ３３．３４．３５を端子ａに切換え
るときは、位置検出コイルは２６→２６．２８→２８→
２８．３０→３０→３０．２６→２６の順にその両端電
圧が大きくなり、回転子４７を時計方向に回転する。When switching the switch 33, 34, 35 to terminal a in this way, the position detection coil changes from 26→26.28→28→
The voltage across both ends increases in the order of 28.30→30→30.26→26, causing the rotor 47 to rotate clockwise.
また第４図状態においてスイッチ３３．３４．３５を夫
々端子すに切換えると、位置検出コイル２９の電圧が大
きく固定子巻線６の励磁により回転子４７が反時計方向
に回転する。Furthermore, when the switches 33, 34, and 35 are switched to the respective terminals in the state shown in FIG. 4, the voltage of the position detection coil 29 becomes large and the stator winding 6 is energized, causing the rotor 47 to rotate counterclockwise.
すると位置検出コイル２９、２７の電圧が大きくなり、
固定子巻線６，５の励磁により回転子４７が反時計方向
に回転する。Then, the voltage of the position detection coils 29 and 27 increases,
The rotor 47 rotates counterclockwise by excitation of the stator windings 6 and 5.
以下同様に２９→２９．２７→２７→２７．３１→３１
→３１→３１．２９→２９の順に電圧が大きくなり、回
転子４７を反時計方向に回転する。Similarly, 29 → 29.27 → 27 → 27.31 → 31
The voltage increases in the order of →31→31.29→29, and the rotor 47 is rotated counterclockwise.
而してスイッチ３３．３４．３５はその切換えにより回
転子４７の回転方向を制御することができるが、回転子
の一方向回転時に短時間切換えることにより回転子の制
動としても用いることができる。By switching the switches 33, 34, 35, the direction of rotation of the rotor 47 can be controlled, but by switching for a short time when the rotor rotates in one direction, it can also be used to brake the rotor.
尚一対の位置検出、コイル２６．２７．２８．２９．３
０．３１は回転子磁石４３の同極を検出する必要はない
。Furthermore, a pair of position detection coils 26.27.28.29.3
0.31, it is not necessary to detect the same polarity of the rotor magnets 43.
以上の如く本考案によれば、回転子磁石の一方向の磁束
の有無によりインピーダンス値が変化する２個の位置検
出コイルを選択的にインピーダンス素子に切換接続する
直列回路を設け、この直列回路に交流電源を印加すると
共に直列回路の中間電圧を、各固定子巻線を通電制御す
るトランジスタのベースに印加するようにしたから、回
転子磁石に近接する位置検出コイルにて回転位置が検出
でき、スイッチの切換えにより、回転子の回転を制御す
ることができる。As described above, according to the present invention, a series circuit is provided in which two position detection coils whose impedance values change depending on the presence or absence of magnetic flux in one direction of the rotor magnet are selectively connected to an impedance element. Since AC power is applied and the intermediate voltage of the series circuit is applied to the base of the transistor that controls the energization of each stator winding, the rotational position can be detected by the position detection coil close to the rotor magnet. Rotation of the rotor can be controlled by switching the switch.
また回転子の位置検出は従来のように１次コイル及び２
次コイル間の磁気結合の変化により行うものではないの
で位置検出機構が簡単になり、又回転方向を制御すると
きに２個の位置検出コイルをインピーダンス素子に対し
切換制御するのみでなく、インピーダンス素子と位置検
出コイルとの接続位置を逆にする必要がなく、スイッチ
回路が簡単になる等実用的効果大なるものである。In addition, rotor position detection is performed using the primary coil and secondary coil as in the past.
The position detection mechanism is simplified because it is not performed by changing the magnetic coupling between the secondary coils, and when controlling the rotation direction, it is not only necessary to switch the two position detection coils with respect to the impedance element, but also to control the rotation direction using the impedance element. There is no need to reverse the connection position of the position detection coil and the position detection coil, and the switch circuit becomes simpler, which has great practical effects.
図面は本考案の一実施例を示し、第１図は無刷子直流電
動機の制御回路図、第２図イ９口は位置検出コイルの構
成説明図及び電圧波形説明図、第３図は前記直流電動機
の断側面図、第４図は回転子磁石に対する位置検出コイ
ルの配置説明図である。
４３・・・・・・回転子磁石、２６〜３１・・・・・・
位置検出コイル、３２・・・・・・インピーダンス素子
、３３〜３５・・・・・・スイッチ、２３〜２５・・・
・・・直列回路、５〜７・・・・・・固定子巻線、１９
・・・・・・交流電源、８〜１０．１２〜１４・・・・
・・トランジスタ。The drawings show one embodiment of the present invention, and FIG. 1 is a control circuit diagram of a brushless DC motor, FIG. FIG. 4, a cross-sectional side view of the electric motor, is an explanatory diagram of the arrangement of position detection coils with respect to rotor magnets. 43...Rotor magnet, 26-31...
Position detection coil, 32... Impedance element, 33-35... Switch, 23-25...
...Series circuit, 5-7...Stator winding, 19
...AC power supply, 8-10.12-14...
...Transistor.
Claims (1)
状回転子磁石を備え、この磁石の一方向磁束の有無によ
りインピーダンス値が変化する２個の位置検出コイルを
選択的にインピーダンス素子に切換接続するスイッチを
含む直列回路を、固定子巻線数に応じて設け、前記各直
列回路を交流電源に接続すると共に各直列回路の中間電
圧を、各固定子巻線を通電制御するトランジスタのベー
スに印加し、前記２個のコイルが異なる回転子位置を検
出するように、一方のコイルを前記回転子磁石の内周縁
対抗位置に、他方のコイルを外周縁対抗位置に夫々近接
して配置し、且夫々磁気バイアス用磁石とともに、固定
子ケースに取付けられる樹脂ホルダに収納し、前記スイ
ッチの切換えにより回転子の回転を制御してなる無刷子
直流電動機の制御装置。It is equipped with an annular rotor magnet that is magnetized in the radial direction and alternately magnetized with different polarities in the circumferential direction, and selectively impedes two position detection coils whose impedance value changes depending on the presence or absence of unidirectional magnetic flux of this magnet. Series circuits including switches connected to the elements are provided in accordance with the number of stator windings, each of the series circuits is connected to an AC power supply, and the intermediate voltage of each series circuit is controlled to be energized to each stator winding. A voltage is applied to the base of the transistor, and one coil is placed close to a position facing the inner circumference of the rotor magnet, and the other coil is placed close to a position facing the outer circumference of the rotor magnet, so that the two coils detect different rotor positions. A control device for a brushless direct current motor, which is arranged with magnetic bias magnets in a resin holder attached to a stator case, and controls the rotation of a rotor by switching the switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976117462U JPS5918876Y2 (en) | 1976-08-31 | 1976-08-31 | Control device for brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976117462U JPS5918876Y2 (en) | 1976-08-31 | 1976-08-31 | Control device for brushless DC motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5334610U JPS5334610U (en) | 1978-03-27 |
| JPS5918876Y2 true JPS5918876Y2 (en) | 1984-05-31 |
Family
ID=28727038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1976117462U Expired JPS5918876Y2 (en) | 1976-08-31 | 1976-08-31 | Control device for brushless DC motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5918876Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0690900B2 (en) * | 1988-11-14 | 1994-11-14 | 株式会社キーエンス | Multi-axis photoelectric switch |
| JPH0625870Y2 (en) * | 1989-08-01 | 1994-07-06 | 株式会社キーエンス | Photoelectric switch and its unit |
| JPH0625871Y2 (en) * | 1989-08-01 | 1994-07-06 | 株式会社キーエンス | Photoelectric switch |
-
1976
- 1976-08-31 JP JP1976117462U patent/JPS5918876Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5334610U (en) | 1978-03-27 |
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