JPS5812565A - Dc motor - Google Patents
Dc motorInfo
- Publication number
- JPS5812565A JPS5812565A JP56109987A JP10998781A JPS5812565A JP S5812565 A JPS5812565 A JP S5812565A JP 56109987 A JP56109987 A JP 56109987A JP 10998781 A JP10998781 A JP 10998781A JP S5812565 A JPS5812565 A JP S5812565A
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- electromagnet
- magnet
- terminal
- permanent magnets
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K25/00—DC interrupter motors or generators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Brushless Motors (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、リードスイッチを用いた磁極回転型の直流
電動機に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic pole rotation type DC motor using a reed switch.
従来、玩具などに使用されている小型直流電動機は磁石
が固定子、電気子が回転子となっているもので整流子と
ブラシを用いであるが小型のためその損傷の補修が面倒
であり、また乾電池の消費も激しく、使用者たる子供達
も困惑しているという問題点がある。Conventionally, small DC motors used in toys etc. have a magnet as a stator and an armature as a rotor, and use a commutator and brushes, but due to their small size, repairing damage is difficult. Another problem is that the batteries are consumed rapidly, which is confusing to the children who use them.
この発明は斜上の点に着目してなされたもので、磁極回
転型にし、整流子やプランを廃し、リードスイッチを利
用してこれら問題点を解決したものである。This invention was made by focusing on the diagonal point, and solved these problems by using a rotating magnetic pole type, eliminating the commutator and plan, and using a reed switch.
以下、この発明の一実施例を第1図〜第3図に基づいて
説明する。Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3.
この実施例は、三輪自動車T に この発明の直流電動
#Mを装備したものである。In this embodiment, a three-wheeled vehicle T is equipped with the DC electric motor #M of the present invention.
1は直流電動機Mの回転子、lhは回転子本体、1 a
* l b 、l c e l dは該回転子本体1
hに等角度に外面をN極にして接着された表裏N8極の
円盤型フェライトの磁石、2社回転午1の(ロ)転軸、
3は電磁石、3mは該電磁石3の捲線、3a、3bは該
捲線3mの端子、3cは電磁石8の鉄心、3d/Ii該
鉄心3cの回転子1側の端部、4は乾電池筐、4a#d
該乾電池筐に増付けられた十端子。1 is the rotor of the DC motor M, lh is the rotor body, 1 a
*l b and l c e l d are the rotor body 1
A disk-shaped ferrite magnet with N8 poles on the front and back glued at equal angles to h with the outer surface as N pole, (b) rotating axis of two companies' rotation 1,
3 is an electromagnet, 3m is a winding of the electromagnet 3, 3a and 3b are terminals of the winding 3m, 3c is an iron core of the electromagnet 8, 3d/Ii is an end of the iron core 3c on the rotor 1 side, 4 is a dry battery case, 4a #d
Ten terminals added to the dry battery case.
4bは同じく一端子、4c 、4dは同じく接続端子、
5は乾電池、6は運転スイッチ、6uは運転レバー、6
sは該運転レバー6uの支点端子、6aは前進用端子、
6bは後進用端子、6cは停止用端子、7は下部リード
スイッチ、7a、、7bは該下部リードスイッチ7の受
金具、8は上部リードスイッチ、8a、8bは該上部リ
ードスイッチの受金具、9は三輪自動車Tの車体、1o
はハンドル、11は該ハンドル10で操作される前輪、
12は回転軸2に嵌入保持された回転自由な遊動後輪、
13は駆動後輪で、回転軸2の延長線上車体9に突設さ
れた車軸13aに回転自由に嵌入保持され、内面中央に
大歯車13bを固着している。4b is the same terminal, 4c and 4d are the connection terminals,
5 is a dry battery, 6 is a driving switch, 6u is a driving lever, 6
s is a fulcrum terminal of the operating lever 6u, 6a is a forward terminal,
6b is a reverse terminal, 6c is a stop terminal, 7 is a lower reed switch, 7a, 7b is a receiving fitting for the lower reed switch 7, 8 is an upper reed switch, 8a and 8b are receiving fittings for the upper reed switch, 9 is the body of tricycle T, 1o
is a handle; 11 is a front wheel operated by the handle 10;
12 is a freely rotatable rear wheel that is fitted and held on the rotating shaft 2;
Reference numeral 13 denotes a driving rear wheel, which is rotatably fitted and held on an axle shaft 13a protruding from the vehicle body 9 on an extension of the rotary shaft 2, and has a large gear 13b fixed to the center of its inner surface.
2hは車体9に装備された回転軸2の左軸受、2mは同
じく右軸受、2gは回転軸2に固着された小歯車、14
は中間歯車で車体9に装備された軸受14aに保持され
、小歯車2Bと噛合う大歯車+4bおよび大歯車13b
に噛合う小歯車14sとを形成している。2h is the left bearing of the rotating shaft 2 installed on the vehicle body 9, 2m is the right bearing, 2g is the small gear fixed to the rotating shaft 2, 14
is an intermediate gear held by a bearing 14a installed in the car body 9, and is a large gear +4b and a large gear 13b that mesh with the small gear 2B.
A small gear 14s that meshes with the small gear 14s is formed.
また、電気配線は、第3図に示すように導線15を接続
する。すなわち、導線15aは乾電池筺4の十端子4a
−運転スイッテ6の支点端子6B、導線+5bは前進用
端子6a−下部リードスイッチ7の受金具7a、導線1
5cは受金具7b−捲池筐4の一端子4b、導線15e
は運転スイッチ6の後進用端子6b−上部リードスイッ
チ8の受金具8a、導線15fは受金具8b−捲線3m
の端子3aにそれぞれ接続する。Furthermore, the electrical wiring is connected to a conducting wire 15 as shown in FIG. That is, the conducting wire 15a is connected to the terminal 4a of the dry battery case 4.
- The fulcrum terminal 6B of the operation switch 6, the conductor +5b is the forward terminal 6a - the receiving bracket 7a of the lower reed switch 7, the conductor 1
5c is the receiving metal fitting 7b-one terminal 4b of the winding case 4, and the conductor 15e
is the reverse terminal 6b of the operation switch 6 - the receiving bracket 8a of the upper reed switch 8, and the conductor 15f is the receiving bracket 8b - winding 3m
are connected to the respective terminals 3a.
次にこの発明の作用について述べる。Next, the operation of this invention will be described.
まず、三輪自動車Tの前進の場合は、運転レバー6uを
停止用端子6cから前進用端子6aに移すと前進回路A
が閉じ電流は乾電池5→乾電池筺4の十端子4a→導線
15a→支点端子68→運転レバー6u→前進用端子6
a→導線+5b→受金具7a→下部リードスイッ、チア
→受金具7b→導線15c→端子8a−e悄線3m→端
子3b→導線15d→一端子4b→乾電池5のように流
れるので電磁石3は磁化され鉄心8cの回転子側の端部
3dはN極となる。そこで端部3dにN極で対面してい
る回転子lの一番目の磁石1aは反撥力Rを受は下方す
なわち前進方向へ回り去ろうとし同時に二番目の磁石1
bが端面3dに近付こうとする。このとき磁石1aの後
端から出る磁力線Fにより下部リードスイッチ7は一時
的に「断」となるので自己誘導作用により逆起電力が誘
導され電流が逆流し端部3dはS極に変り二番目の磁石
lbを引力Pで引き付ける。First, when the three-wheeled vehicle T moves forward, when the driving lever 6u is moved from the stop terminal 6c to the forward terminal 6a, the forward circuit A
is closed, and the current flows from the dry battery 5 → the terminal 4a of the dry battery case 4 → the conductor 15a → the fulcrum terminal 68 → the operation lever 6u → the forward terminal 6
a → Conductor + 5b → Bracket 7a → Lower lead switch, chia → Bracket 7b → Conductor 15c → Terminal 8a-e 3 m → Terminal 3b → Conductor 15d → One terminal 4b → Electromagnet 3 is magnetized as it flows like a dry battery 5. The end 3d of the iron core 8c on the rotor side becomes the north pole. Therefore, the first magnet 1a of the rotor l, which faces the end 3d with its north pole, receives the repulsive force R, and at the same time, the second magnet 1
b tries to approach the end face 3d. At this time, the lower reed switch 7 is temporarily turned off due to the magnetic line of force F coming out from the rear end of the magnet 1a, so a back electromotive force is induced by self-induction, and the current flows backward, changing the end 3d to the S pole, and the second attracts magnet lb with attractive force P.
ところが該磁石1bが端部3dと対面する位置の手前辺
りで、その前方から出る磁力線Fが作用し下部リードス
イッチ7を一時的に「断」とするので端部3dは前記作
用により再びN極に変るため磁石1bのN極を反撥する
が回転惰力Cにより対面する位置を通り過ぎて今度は下
方へ反撥され、磁石1bは下方へ回る。三番目の磁石1
c、四番目の磁石1dも同じ作用を受け”ド方へ回る。However, in front of the position where the magnet 1b faces the end 3d, the lines of magnetic force F coming out from the front act and temporarily disconnect the lower reed switch 7, so the end 3d becomes the N pole again due to the above action. , the N pole of the magnet 1b is repelled, but due to the rotational inertia C, it passes the facing position and is now repelled downward, and the magnet 1b rotates downward. third magnet 1
c. The fourth magnet 1d is also subjected to the same action and rotates in the "C" direction.
すな ゛わち回転子1は次々に磁石Ia、lb、lc、
1dにより回転力を与えられかつ重量物である磁石l
a + I b + l c 、I dが円周にあるた
め勢車のようになって前進方向へ回転する。そこで回転
軸2→小歯車28→中間歯車の大歯車14b→小歯車1
4s→駆動車輪13の大歯車+3bと回転力を減速して
駆動車輪13へ伝達し該駆動車輪13を前進方向に回転
させるので遊動車輪12は遊動回転し三輪自動車Tは前
進する。That is, the rotor 1 has magnets Ia, lb, lc,
The magnet l is given a rotational force by 1d and is a heavy object.
Since a + I b + l c and I d are on the circumference, it rotates in the forward direction like a cart. Therefore, rotating shaft 2 → small gear 28 → large gear 14b of intermediate gear → small gear 1
4s→large gear +3b of the drive wheel 13 and the rotational force is decelerated and transmitted to the drive wheel 13, causing the drive wheel 13 to rotate in the forward direction, so the idle wheel 12 freely rotates and the three-wheeled vehicle T moves forward.
なお、回転子lの回転状況を第4図に基づいて詳述すれ
ば(イ)は運転レバー6uが停止用端子6cにある場合
で、磁石1aが鉄心8cの回転子側端部3dと対面して
いるところ、(ロ)は運転レバー6Uを前進用端子6a
に移した場合で、端部3dがN極となり(ロ)転子1の
磁石1aを下方へ反撥力Rで下方へ押し回転惰力Cを得
たところ、し罎は磁石1aの後方から出た磁力+1!F
が下部リードスイッチ7に作用し端部3dが8極に変り
引力Pで磁石Ibを引きつけようとしているところ、に
)は磁石lbが端部3dに近付き前方から出る磁力線F
が下部リードスイッチ7に作用し端部3dが再びN極に
変り反撥力Rが発生して磁力1bを押し戻そうとするが
回転惰力Cが大きいのでそのまま同転子1を回転させよ
うとするところ、(ホ)は磁石tbが端部3dとの対面
位置を通9越し下方へ反撥力Rで押し下げられるところ
である。In addition, if the rotation state of the rotor 1 is described in detail based on FIG. 4, (a) is the case where the operation lever 6u is at the stop terminal 6c, and the magnet 1a faces the rotor side end 3d of the iron core 8c. (b) is when the operation lever 6U is connected to the forward movement terminal 6a.
In this case, the end 3d becomes the N pole (b) When the magnet 1a of the trochanter 1 is pushed downward by the repulsive force R and a rotational inertia C is obtained, the shaft comes out from the rear of the magnet 1a. Magnetism +1! F
acts on the lower reed switch 7, and the end 3d changes to 8 poles and is about to attract the magnet Ib with the attractive force P. (2) shows that the magnet lb approaches the end 3d and lines of magnetic force F emerge from the front.
acts on the lower reed switch 7, and the end 3d changes to the N pole again, generating a repulsive force R that tries to push back the magnetic force 1b, but since the rotational inertia C is large, it tries to keep the rotor 1 rotating. At (E), the magnet tb is pushed down by the repulsive force R past the position 9 facing the end 3d.
ただし、運転レバー6uを操作するとき、例えば一番目
の磁石1aと端部3dとの関係位置にょり前進操作をし
たのに回転子1が逆転した位置に停滞することがあるが
、その際には瞬時後進へレバー操作して回転子1を動か
して磁石1aの位置を変え、直ちに前進操作をすれば回
転子1に前進回転をさせることができる。また、後進の
場合も同様である。However, when operating the operating lever 6u, the rotor 1 may stagnate in a reversed position even though it has been operated forward due to the relative position between the first magnet 1a and the end 3d, for example. The rotor 1 can be rotated forward by momentarily operating the lever to move backward to move the rotor 1 and change the position of the magnet 1a, and then immediately operating the lever forward. The same applies to the case of reversing.
なお、回転子lの停滞状況を第5図に基づいて詳述すれ
ば、(イ)は運転レバー6uが停止用端子6Cにある場
合で磁石1aが回転子側端部3dとの対面位置より少し
上に止っているところ、(ロ)は運転レバー6uを前進
用端子6aに移した場合で、端部3dがN極となり磁石
1aが端部3dの反撥力Rを受は上方すなわち逆方向へ
押されようとするところ、(ハ)は磁石1aが少し上方
へ動き該礎石ldの回転方向から見てその後方へ出る磁
力線Fが下部リードスイッチ7に作用して端部3dがS
極に変ったところ、に)は磁石1aは回転惰力Cがまだ
小さいので端部3dのS極の引力Pに負けて引き寄せら
れようとするところ、(ホ)は磁石1aが端部3dに近
付きその回転方向からみて前方へ山部3dがN極に変り
杏び上方へ押し戻されようとするところ、すなわち、磁
石1aは上記往復運動を繰返して停滞するか又はバラン
スがとれて静止する。In addition, if the stagnation situation of the rotor 1 is explained in detail based on FIG. When it stops slightly above, (b) shows the case where the driving lever 6u is moved to the forward movement terminal 6a, and the end 3d becomes the north pole and the magnet 1a receives the repulsive force R of the end 3d upward, that is, in the opposite direction. When the cornerstone 1a is about to be pushed toward the bottom, (c) the magnet 1a moves slightly upward, and the lines of magnetic force F coming out behind it when viewed from the direction of rotation of the cornerstone ld act on the lower reed switch 7, causing the end 3d to move toward S.
When the polarity changes, in) the magnet 1a is about to be attracted by the attractive force P of the S pole at the end 3d because the rotational inertia C is still small, and in (e) the magnet 1a is about to be attracted to the end 3d. As the magnet 1a approaches the magnet 1a, the peak portion 3d changes to the N pole and is about to be pushed back upward when viewed from the direction of rotation, that is, the magnet 1a repeats the above-mentioned reciprocating motion and becomes stagnant or remains balanced.
従ってこの際、運転レバー6uを後進用端子6bに移せ
ば回転子lは停滞することなく後進同転を始め、直ちに
運転レバー6uを前進用端子6aに移せば前進回転に変
えることができる。Therefore, at this time, if the operating lever 6u is moved to the reverse terminal 6b, the rotor l will start rotating backward without stagnation, and if the operating lever 6u is immediately moved to the forward terminal 6a, the rotation can be changed to forward rotation.
次に後進の場合は、運転レバー6uを後進用端子6bに
移すと後進回路Bが閉じ電流は乾電池5→乾電池筐4の
十端子4a→導線15a→支点端子68→運転レバー6
u→後進用端子6b→導線15e→受金具8a→上部リ
ードスイッチ8→受金具8b→導線15f→端子3a→
捲線3m→端子3b→導線+5d−一端子4b→乾電池
5のように流れるので電磁石3は磁化され鉄心3cの回
転子側の端部3dはN極となる。そこで端部3dにN極
で対面している一番目の磁石1aは反撥され上方すなわ
ち後進方向へ回り去ろうとし同時に四番目の磁石1dが
端面3dに下方から近付こうとする。このとき磁石1a
の後端から出る磁力線Fにより上部リードスイッ(8は
一時的に「断」となるので、前記の自己誘導作用により
端部3dViS極に変り四番目の磁石1dを引き付ける
。Next, in the case of reversing, when the driving lever 6u is moved to the reverse terminal 6b, the reverse circuit B is closed and the current flows from the dry battery 5 to the ten terminal 4a of the battery case 4 to the conductor 15a to the fulcrum terminal 68 to the driving lever 6.
u → Reverse terminal 6b → Conductor 15e → Receiver 8a → Upper reed switch 8 → Receiver 8b → Conductor 15f → Terminal 3a →
Since the flow flows as follows: winding 3 m → terminal 3 b → conductor +5 d - one terminal 4 b → dry battery 5, the electromagnet 3 is magnetized and the end 3 d of the iron core 3 c on the rotor side becomes the north pole. Therefore, the first magnet 1a facing the end 3d with its north pole is repelled and tries to rotate upward, that is, in the backward direction, and at the same time, the fourth magnet 1d tries to approach the end 3d from below. At this time, magnet 1a
The upper reed switch (8) is temporarily turned off due to the magnetic field line F coming out from the rear end, so the end becomes 3dViS pole due to the above-mentioned self-induction action and attracts the fourth magnet 1d.
ところが該磁石1dが端1iflladと対面する位置
の手ボ1辺りに上って来たとき、・−の前方から出る磁
力線Fが上部リードスイッチ8に作用し一時的に「断」
とするので前記作用により端部3dは再びN極に変るた
め磁石1dのN極を反撥するが、回転惰力Cにより磁石
1dは対面位置を行き過ぎ、今度;d上方へ反撥されて
回り去る。However, when the magnet 1d rises to the position where it faces the end 1ifllad, the lines of magnetic force F coming out from the front of the - act on the upper reed switch 8, causing it to temporarily break.
Therefore, due to the above action, the end portion 3d changes to the north pole again and repels the north pole of the magnet 1d, but due to the rotational inertia C, the magnet 1d passes past the facing position, and is now repelled upward by ;d and goes around.
三番目の磁石1c、二番目の磁石1bも同じ作用を受け
、前進の場合と同様に回転子1は後進i回へ回転し、三
輪自動車は後進する。The third magnet 1c and the second magnet 1b are also subjected to the same action, and the rotor 1 rotates i times in reverse in the same way as in the case of forward movement, and the three-wheeled vehicle moves backward.
斜上の構成にしたので、この発明によれば、リードスイ
ッチの断接によ抄鉄心の磁極を交番的に変換して回転子
を回転することができるので、従来の直流電動機の如き
整流子やブラシを必要とせず、極めて簡単な構造となり
製作費も低摩でかつ故障もない。また整流子とブラシの
摩擦のような摩擦部分が全然無いので電力の消費も著し
く少く乾電池を用いた場合、その寿命は従来の電動機に
比し4乃至5倍にも達している。なお、従来の電動機で
しばしば起こる整流子やブラシの摩耗に対し暦き修正す
るには高度の技術と精密さを要するのに反し消耗部分と
考えられるリードスイッチは受金具に保持されているの
で、子供でも簡単に交換するだけで旧状に復し得るとい
う効果もある。Because of the diagonal configuration, according to the present invention, the rotor can be rotated by alternating the magnetic poles of the core by switching on and off the reed switch. It does not require any brushes or brushes, has an extremely simple structure, has low manufacturing costs, and is free from failure. Furthermore, since there is no friction between the commutator and the brushes, power consumption is extremely low, and when dry batteries are used, their lifespan is four to five times longer than that of conventional electric motors. It should be noted that it requires a high degree of skill and precision to regularly correct the wear and tear of the commutator and brushes that often occur in conventional electric motors.However, the reed switch, which is considered a consumable part, is held in a bracket. It also has the effect that even a child can restore the old condition by simply replacing it.
第1図はこの発明を装備した三輪自動車の各部のカバー
を撤去した平面図、第2図は第1図におけるト」線の断
面図、第3図は配線図、第4図は回転子の回転作用説明
図、第5図は回転子の停滞作用説明図である。
M・・・・・・直流電動機
1・・・・・・回転子
l a + I b * I c 、I d ・・・磁
石2・・・・・・回転軸
3・・・・・・電磁石
3c・・・・・・鉄心
3d・・・・・・回転子側の端部
5・・・・・・・・・乾電池
6・・・・・・・・・運転スイッチ
7・・・・・・・・・下部リードスイッチ8・・・・・
・・・・上部リードスイッチ15・・・・・・・・・導
線
C・・・・・・・・・回転惰力
F・・・・・・・・・磁力線
P・・・・・・・・・引力
R・・・・・・・・・反撥力Figure 1 is a plan view of a three-wheeled vehicle equipped with this invention with covers removed, Figure 2 is a sectional view taken along line T in Figure 1, Figure 3 is a wiring diagram, and Figure 4 is a diagram of the rotor. FIG. 5 is an explanatory diagram of the rotor stagnation action. M: DC motor 1: Rotor l a + I b * I c , I d: Magnet 2: Rotating shaft 3: Electromagnet 3c... Iron core 3d... Rotor side end 5... Dry battery 6... Operation switch 7... ...Lower reed switch 8...
...... Upper reed switch 15 ...... Conductor C ...... Rotating inertia F ...... Magnetic field line P ......・Attractive force R・・・・・・Repulsive force
Claims (1)
配設した回転子を該回転子の回転軸が電磁石の鉄心中心
線の延長線上に該延長線と直角になるよう、かつ鉄心端
面に回転円周外面を近接して装備し、運転スイッチと組
み合わしたリードスイッチを鉄心端面の上下所要位置に
回転軸に平行に配設して成ることを特徴とした直流電動
機。A rotor in which the required number of magnets are arranged at equal angles around the outer circumference with the same magnetic poles on the outer surface side is arranged so that the rotation axis of the rotor is on an extension line of the iron core center line of the electromagnet and perpendicular to the extension line, and the iron core A DC motor characterized by having a rotating circumferential outer surface close to the end face, and a reed switch combined with an operation switch arranged parallel to the rotating shaft at required positions above and below the core end face.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56109987A JPS5812565A (en) | 1981-07-16 | 1981-07-16 | Dc motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56109987A JPS5812565A (en) | 1981-07-16 | 1981-07-16 | Dc motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5812565A true JPS5812565A (en) | 1983-01-24 |
Family
ID=14524206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56109987A Pending JPS5812565A (en) | 1981-07-16 | 1981-07-16 | Dc motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5812565A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4642534A (en) * | 1985-07-15 | 1987-02-10 | Emile Mitchell | Magnetic driven motor |
CN102480203A (en) * | 2010-11-25 | 2012-05-30 | 沈阳工业大学 | Detection and commutation integrated brushless direct current motor |
CN103840724A (en) * | 2012-11-26 | 2014-06-04 | 沈阳工业大学 | Brushless direct current motor and commutation method thereof |
-
1981
- 1981-07-16 JP JP56109987A patent/JPS5812565A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4642534A (en) * | 1985-07-15 | 1987-02-10 | Emile Mitchell | Magnetic driven motor |
CN102480203A (en) * | 2010-11-25 | 2012-05-30 | 沈阳工业大学 | Detection and commutation integrated brushless direct current motor |
CN103840724A (en) * | 2012-11-26 | 2014-06-04 | 沈阳工业大学 | Brushless direct current motor and commutation method thereof |
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