WO2019186859A1 - Electric fan - Google Patents
Electric fan Download PDFInfo
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- WO2019186859A1 WO2019186859A1 PCT/JP2018/013100 JP2018013100W WO2019186859A1 WO 2019186859 A1 WO2019186859 A1 WO 2019186859A1 JP 2018013100 W JP2018013100 W JP 2018013100W WO 2019186859 A1 WO2019186859 A1 WO 2019186859A1
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- rotor
- motor
- motor shaft
- electric fan
- stator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
Definitions
- the present invention relates to an electric fan equipped with a swing mechanism using a stepping motor.
- the stepping motor is useful for adjusting the angle of the component and changing the rotation speed because the rotation speed and the rotation angle can be freely changed by the input pulse, and is used for rotating the component in various fields.
- the electric fan includes a blower that rotates an impeller attached to the shaft of the electric motor to generate wind.
- a blower that rotates an impeller attached to the shaft of the electric motor to generate wind.
- Patent Document 1 discloses a fan that includes a stepping motor for swinging left and right and a stepping motor for swinging up and down, and realizes angle adjustment between left and right swinging and vertical swinging.
- the centrifugal force generated during rotation becomes a force that pulls the rotor in the radial direction. Therefore, the rotor of the stepping motor normally rotates along the outer periphery of the motor shaft provided inside the motor. Since the centrifugal force is generated in the direction from the center of rotation to the center of gravity, the direction of the centrifugal force changes according to the rotation angle of the rotor.
- a fan using a stepping motor for swinging operation has a problem that noise that the user feels uncomfortable occurs due to the collision sound generated in the stepping motor during swinging operation being amplified by the structure of the fan. .
- the present invention has been made in view of the above, and an object of the present invention is to obtain a fan that prevents generation of noise from a stepping motor during swinging operation.
- the present invention includes an impeller, an electric motor unit that rotates the impeller, and an oscillation mechanism that performs an oscillation operation that varies the direction of the electric motor unit.
- the head swing mechanism includes a stepping motor having a stator, a motor shaft installed inside the stator, and a rotor inserted into the motor shaft with a gap between the motor shaft.
- the stepping motor is operated at a speed at which the rotor rotates while being pulled to the same side as the direction in which the rotor is pulled by an unbalanced magnetic attractive force generated by the motor shaft being displaced from the center of the stator.
- the electric fan according to the present invention has an effect of preventing noise from the stepping motor during swinging operation.
- FIG. 1 The figure which shows the external appearance of the electric fan which concerns on Embodiment 1 of this invention. Exploded view of front guard and rear guard of electric fan according to Embodiment 1 The figure which shows the structure inside the base part of the electric fan which concerns on Embodiment 1.
- FIG. 1 is a diagram showing an external appearance of a fan according to Embodiment 1 of the present invention.
- FIG. 2 is an exploded view of the front guard and the rear guard of the electric fan according to the first embodiment.
- FIG. 3 is a diagram illustrating an internal structure of the pedestal portion of the electric fan according to the first embodiment.
- the electric fan 100 includes an impeller 101, an electric motor unit 102 that rotates the impeller 101, a support column 103 that supports the electric motor unit 102, and a pedestal unit 104 that holds the support column 103 at the base.
- the impeller 101 is attached to the motor shaft of the motor unit 102. When the electric motor of the electric motor unit 102 rotates the impeller 101, the electric fan 100 generates wind.
- the electric fan 100 includes a front guard 1 and a rear guard 2 that protect the impeller 101 so that the user cannot touch the rotating impeller 101.
- the rear guard 2 is attached to the electric motor unit 102.
- the impeller 101 is disposed inside the rear guard 2.
- a guard ring 33 is attached to the rear guard 2, and the impeller 101 is covered and protected from the front and rear by the front guard 1 and the rear guard 2 by assembling the front guard 1 to the guard ring 33.
- the electric motor unit 102 has a swing mechanism 105 that drives up and down. Further, the pedestal portion 104 includes a swing mechanism 106 that is driven left and right by rotating the support column 103.
- the user can set the blowing direction.
- the air volume and the swing direction of the electric fan 100 are operated by a switch 104 a installed in the pedestal unit 104.
- the remote controller operation may be possible for the air volume and the swing direction of the electric fan 100.
- a stepping motor 3 is installed inside the base portion 104.
- the stepping motor 3 rotates the drive gear 4 attached to the shaft by rotating the internal rotor.
- pillar part 103 is rotatably supported by the base part 104.
- the rotation gear 5 is attached to the lower portion of the support column 103.
- the drive gear 4 of the stepping motor 3 transmits the rotational force to the rotation gear 5, the support column 103 rotates. That is, the stepping motor 3 and the rotating gear 5 constitute the left and right swing mechanism 106 of the electric fan 100.
- the support column 103 rotates, the left and right swinging motion of the electric fan 100 is performed.
- FIG. 4 is a perspective view of a stepping motor that realizes the left and right swing mechanism of the electric fan according to the first embodiment.
- FIG. 5 is an exploded perspective view of the stepping motor that realizes the left and right swing mechanisms of the electric fan according to the first embodiment.
- a motor shaft 8 is fixed perpendicularly to the bottom surface 3b of the motor bracket 3a.
- the rotor 7 provided with a permanent magnet on the surface of the cylindrical member is inserted into the motor shaft 8 with a gap between the rotor shaft 7 and the motor shaft 8.
- the rotor 7 includes a shaft 7 a that serves as an output shaft of the stepping motor 3. The rotation of the shaft 7a is transmitted to the drive gear 4 by the transmission mechanism 3c.
- FIG. 6 is a diagram illustrating a state in which an unbalanced magnetic attractive force is generated in the stepping motor of the electric fan according to the first embodiment. As shown in FIG. 6, when an unbalanced magnetic attractive force is generated during energization, a force in a specific direction acts strongly on the rotor 7.
- FIG. 7 is a diagram showing a state change during rotation of the stepping motor that realizes the left and right swing mechanism of the electric fan according to the first embodiment.
- the rotational speed of the rotor 7 is decreased to reduce the centrifugal force so that the rotor 7 is not pulled by the magnetic attractive force. That is, the centrifugal force is reduced so that the magnetic attractive force is superior, and the rotor 7 is rotated while being pulled to the same side as the direction pulled by the magnetic attractive force. Since the rotor 7 rotates while being pulled in the same direction as that pulled by the magnetic attractive force, the rotor 7 does not move rapidly and no collision occurs.
- FIG. 7 also shows changes in the rotational state of the rotor 17 when the unbalanced magnetic attractive force is larger than the centrifugal force but the difference in force is small.
- the rotor 17 rotates at a high speed, the rotor 17 rotates along the outer periphery of the motor shaft 18 and rotates with a clearance secured in the direction in which the centrifugal force acts.
- the centrifugal force is directed in the direction opposite to the unbalanced magnetic attractive force
- the centrifugal force does not include a component in the normal direction with respect to the unbalanced magnetic attractive force. 17 collides with an internal part of the stepping motor such as the motor shaft 18 or the stator 16. Since the collision of the rotor 17 is a phenomenon that occurs when the centrifugal force is directed in the direction opposite to the unbalanced magnetic attractive force, the collision of the rotor 17 occurs once per rotation.
- the collision sound generated by the collision of the rotor 17 is an event that occurs when the difference between the unbalanced magnetic attractive force and the centrifugal force is small. In other words, this phenomenon occurs when the unbalanced magnetic attractive force is superior to the centrifugal force, but when the rotor 17 also has a force to rotate along the outer periphery of the motor shaft 18 due to the centrifugal force.
- the centrifugal force generated in the rotor 7 of the stepping motor 3 of the electric fan 100 according to Embodiment 1 is a little more than half the centrifugal force generated in the rotor 17.
- the rotor 7 since the difference between the unbalanced magnetic attractive force and the centrifugal force is larger in the rotor 7 than in the rotor 17, the rotor 7 does not rotate along the outer periphery of the motor shaft 8 due to the centrifugal force. Rotates at a fixed position while being pulled by an unbalanced magnetic attractive force. Therefore, rapid movement of the rotating rotor 7 is avoided, and the generation of collision noise due to the collision of the rotor 7 is suppressed.
- the stepping motor 3 has grease for the clearance between the rotor 7 and the motor shaft 8 for the purpose of reducing the impact noise of the rotor 7 and the purpose of smoothing the rotation of the rotor 7. 9 is filled.
- the cause of the centrifugal force generated in the rotor 7 is an unbalance of the rotor 7 itself.
- the clearance between the rotor 7 and the motor shaft 8 is equal to or smaller than the gap between the stator 6 and the rotor 7. Accordingly, the stepping motor 3 does not collide between the rotor 7 and the stator 6 even when the rotor 7 moves suddenly.
- the electric fan 100 rotates the rotor 7 while continuing to pull the unbalanced magnetic attractive force, it avoids a sudden movement of the rotating rotor 7 and suppresses the generation of collision noise due to the collision of the rotor 7. be able to.
- the electric fan 100 suppresses the generation of the collision sound due to the collision of the rotor 7 in the stepping motor 3 that realizes the horizontal swing mechanism 106, but the vertical swing of the electric motor unit 102 is provided.
- the mechanism 105 is realized by a stepping motor, as with the stepping motor 3, it is possible to suppress the occurrence of a collision sound by rotating the rotor while continuing to pull it with an unbalanced magnetic attractive force.
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
An electric fan is provided with an impeller, an electric motor unit for rotating the impeller, and an oscillation mechanism for causing an oscillation operation to be performed to change an orientation of the electric motor unit. The oscillation mechanism is provided with a stepping motor (3) having a stator (6), a motor shaft (8) provided inside the stator (6), and a rotor (7) inserted to the motor shaft (8) with a gap formed between the rotor (7) and the motor shaft (8). The stepping motor (3) is operated at a rotation speed of the rotor (7) while being pulled in the same direction as a direction in which the rotor (7) is pulled with an unbalanced magnetic attractive force generated by moving the motor shaft (8) off the center of the stator (6).
Description
本発明は、ステッピングモータを用いた首振り機構を搭載した扇風機に関する。
The present invention relates to an electric fan equipped with a swing mechanism using a stepping motor.
ステッピングモータは、入力するパルスによって回転数及び回転角度を自由に変動させられるため、部品の角度調整及び回転数変更のために有用であり、多岐にわたる分野で部品回動用に用いられている。
The stepping motor is useful for adjusting the angle of the component and changing the rotation speed because the rotation speed and the rotation angle can be freely changed by the input pulse, and is used for rotating the component in various fields.
近年、扇風機の首振り動作にステッピングモータが使用されるようになっている。扇風機は、電動機のシャフトに取り付けられた羽根車を回転させて風を発生させる送風部を備えている。送風機によって風を送る際、左右の広い範囲に風を送りたい場合は、左右に首振りさせ、室内の上下の空気を撹拌させる目的で上下の広い範囲に風を送りたい場合は、上下に首振りをさせる。
In recent years, stepping motors have been used for the swinging motion of electric fans. The electric fan includes a blower that rotates an impeller attached to the shaft of the electric motor to generate wind. When sending wind with a blower, if you want to send wind over a wide range of left and right, swing it left and right, and if you want to send wind over a wide range of up and down for the purpose of stirring up and down air in the room, Shake.
特許文献1には、左右首振り用のステッピングモータと上下首振り用のステッピングモータとを備え、左右の首振りと上下の首振りとの角度調整を実現する扇風機が開示されている。
Patent Document 1 discloses a fan that includes a stepping motor for swinging left and right and a stepping motor for swinging up and down, and realizes angle adjustment between left and right swinging and vertical swinging.
ステッピングモータのロータは、自量のアンバランスにより回転中心と重心とがずれるため、回転時に発生する遠心力は、ロータを径方向に引っ張る力となる。したがって、ステッピングモータのロータは、通常はモータ内部に備え付けられているモータ軸の外周に沿って回転している。遠心力は回転中心から重心へ向かう方向に発生するため、遠心力の向きはロータの回転角度に合わせて変化する。
Since the rotation center and the center of gravity of the rotor of the stepping motor shift due to its own unbalance, the centrifugal force generated during rotation becomes a force that pulls the rotor in the radial direction. Therefore, the rotor of the stepping motor normally rotates along the outer periphery of the motor shaft provided inside the motor. Since the centrifugal force is generated in the direction from the center of rotation to the center of gravity, the direction of the centrifugal force changes according to the rotation angle of the rotor.
しかし一方で、モータ軸がステータの中心からずれて備え付けられている場合、ロータを回すためにステータが発生させる磁気吸引力が不平衡となっており、特定の方向へロータが引きつけられる。不平衡磁気吸引力が遠心力に比べて強い場合は、回転するロータに働く遠心力と不平衡磁気吸引力とが反対方向を向いたときに、ロータが引っ張られる。その際に、ロータがモータ軸又はステータといった内部部品と衝突するため、1回転に1度衝突音が発生する。ロータがモータ軸に衝突するか、ステータに衝突するかは、ロータとモータ軸との隙間と、ロータとステータとのクリアランスとに依存する。
However, on the other hand, when the motor shaft is installed off the center of the stator, the magnetic attractive force generated by the stator to rotate the rotor is unbalanced, and the rotor is attracted in a specific direction. When the unbalanced magnetic attractive force is stronger than the centrifugal force, the rotor is pulled when the centrifugal force acting on the rotating rotor and the unbalanced magnetic attractive force are directed in opposite directions. At that time, since the rotor collides with an internal component such as a motor shaft or a stator, a collision sound is generated once per rotation. Whether the rotor collides with the motor shaft or the stator depends on the gap between the rotor and the motor shaft and the clearance between the rotor and the stator.
首振り動作にステッピングモータを使用した扇風機は、首振り運転時にステッピングモータ内部で発生した衝突音が扇風機の構造体で増幅されることにより、ユーザが不快と感じる騒音が発生するという問題があった。
A fan using a stepping motor for swinging operation has a problem that noise that the user feels uncomfortable occurs due to the collision sound generated in the stepping motor during swinging operation being amplified by the structure of the fan. .
本発明は、上記に鑑みてなされたものであって、首振り運転時にステッピングモータから騒音が発生することを防止した扇風機を得ることを目的とする。
The present invention has been made in view of the above, and an object of the present invention is to obtain a fan that prevents generation of noise from a stepping motor during swinging operation.
上述した課題を解決し、目的を達成するために、本発明は、羽根車と、羽根車を回転させる電動機部と、電動機部の向きを変動させる首振り動作を行わせる首振り機構とを備える。首振り機構は、ステータと、ステータの内側に設置されたモータ軸と、モータ軸との間に隙間を設けてモータ軸に差し込まれたロータとを有するステッピングモータを備える。ステッピングモータは、モータ軸がステータの中心からずれることによって生じる不平衡磁気吸引力でロータが引っ張られる方向と同じ側に引っ張られながらロータが回転する速度で運転される。
In order to solve the above-described problems and achieve the object, the present invention includes an impeller, an electric motor unit that rotates the impeller, and an oscillation mechanism that performs an oscillation operation that varies the direction of the electric motor unit. . The head swing mechanism includes a stepping motor having a stator, a motor shaft installed inside the stator, and a rotor inserted into the motor shaft with a gap between the motor shaft. The stepping motor is operated at a speed at which the rotor rotates while being pulled to the same side as the direction in which the rotor is pulled by an unbalanced magnetic attractive force generated by the motor shaft being displaced from the center of the stator.
本発明に係る扇風機は、首振り運転時にステッピングモータから騒音が発生することを防止できるという効果を奏する。
The electric fan according to the present invention has an effect of preventing noise from the stepping motor during swinging operation.
以下に、本発明の実施の形態に係る扇風機を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。
Hereinafter, a fan according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
実施の形態1.
図1は、本発明の実施の形態1に係る扇風機の外観を示す図である。図2は、実施の形態1に係る扇風機の前ガード及び後ガードの分解図である。図3は、実施の形態1に係る扇風機の台座部の内部の構造を示す図である。扇風機100は、羽根車101と、羽根車101を回転させる電動機部102と、電動機部102を支持する支柱部103と、支柱部103を根元で保持する台座部104とを備えている。羽根車101は、電動機部102の電動機のシャフトに取り付けられている。電動機部102の電動機が羽根車101を回転させることで、扇風機100は風を発生させる。扇風機100は、回転する羽根車101にユーザが触ることができないように、羽根車101を保護する前ガード1及び後ガード2を備えている。Embodiment 1 FIG.
FIG. 1 is a diagram showing an external appearance of a fan according toEmbodiment 1 of the present invention. FIG. 2 is an exploded view of the front guard and the rear guard of the electric fan according to the first embodiment. FIG. 3 is a diagram illustrating an internal structure of the pedestal portion of the electric fan according to the first embodiment. The electric fan 100 includes an impeller 101, an electric motor unit 102 that rotates the impeller 101, a support column 103 that supports the electric motor unit 102, and a pedestal unit 104 that holds the support column 103 at the base. The impeller 101 is attached to the motor shaft of the motor unit 102. When the electric motor of the electric motor unit 102 rotates the impeller 101, the electric fan 100 generates wind. The electric fan 100 includes a front guard 1 and a rear guard 2 that protect the impeller 101 so that the user cannot touch the rotating impeller 101.
図1は、本発明の実施の形態1に係る扇風機の外観を示す図である。図2は、実施の形態1に係る扇風機の前ガード及び後ガードの分解図である。図3は、実施の形態1に係る扇風機の台座部の内部の構造を示す図である。扇風機100は、羽根車101と、羽根車101を回転させる電動機部102と、電動機部102を支持する支柱部103と、支柱部103を根元で保持する台座部104とを備えている。羽根車101は、電動機部102の電動機のシャフトに取り付けられている。電動機部102の電動機が羽根車101を回転させることで、扇風機100は風を発生させる。扇風機100は、回転する羽根車101にユーザが触ることができないように、羽根車101を保護する前ガード1及び後ガード2を備えている。
FIG. 1 is a diagram showing an external appearance of a fan according to
後ガード2は電動機部102に取付けられている。羽根車101は、後ガード2の内側に配置されている。後ガード2には、ガードリング33が取付けられており、前ガード1をガードリング33に組付けることで、羽根車101は前ガード1及び後ガード2によって前後から覆われ保護される。
The rear guard 2 is attached to the electric motor unit 102. The impeller 101 is disposed inside the rear guard 2. A guard ring 33 is attached to the rear guard 2, and the impeller 101 is covered and protected from the front and rear by the front guard 1 and the rear guard 2 by assembling the front guard 1 to the guard ring 33.
電動機部102は、上下に駆動する首振り機構105を有している。また、台座部104は、支柱部103を回動させることによって左右に駆動する首振り機構106を備えている。電動機部102の上下方向の首振り機構105と、台座部104の左右方向の首振り機構106とを組み合わせることにより、ユーザは、送風方向を設定可能である。扇風機100の風量及び首振りの方向は、台座部104に設置されたスイッチ104aで操作される。なお、扇風機100の風量及び首振りの方向は、リモートコントローラ操作可能であってもよい。
The electric motor unit 102 has a swing mechanism 105 that drives up and down. Further, the pedestal portion 104 includes a swing mechanism 106 that is driven left and right by rotating the support column 103. By combining the vertical swing mechanism 105 of the electric motor unit 102 and the horizontal swing mechanism 106 of the pedestal unit 104, the user can set the blowing direction. The air volume and the swing direction of the electric fan 100 are operated by a switch 104 a installed in the pedestal unit 104. In addition, the remote controller operation may be possible for the air volume and the swing direction of the electric fan 100.
台座部104の内部には、ステッピングモータ3が設置されている。ステッピングモータ3は、内部のロータが回転することでシャフトに取り付けられた駆動ギヤ4を回転させる。また、支柱部103は、台座部104によって回転可能に支持されている。支柱部103の下部には回動ギヤ5が取り付けられており、ステッピングモータ3の駆動ギヤ4が回転力を回動ギヤ5に伝達すると、支柱部103が回動する。すなわち、ステッピングモータ3及び回動ギヤ5は、扇風機100の左右の首振り機構106を構成している。支柱部103が回動することより、扇風機100の左右の首振り動作が行われる。
A stepping motor 3 is installed inside the base portion 104. The stepping motor 3 rotates the drive gear 4 attached to the shaft by rotating the internal rotor. Moreover, the support | pillar part 103 is rotatably supported by the base part 104. FIG. The rotation gear 5 is attached to the lower portion of the support column 103. When the drive gear 4 of the stepping motor 3 transmits the rotational force to the rotation gear 5, the support column 103 rotates. That is, the stepping motor 3 and the rotating gear 5 constitute the left and right swing mechanism 106 of the electric fan 100. As the support column 103 rotates, the left and right swinging motion of the electric fan 100 is performed.
図4は、実施の形態1に係る扇風機の左右の首振り機構を実現するステッピングモータの斜視図である。図5は、実施の形態1に係る扇風機の左右の首振り機構を実現するステッピングモータの分解斜視図である。ステッピングモータ3は、モータブラケット3aの底面3bと垂直にモータ軸8が固定されている。筒状部材の表面に永久磁石を備え付けたロータ7は、モータ軸8との間に隙間を設けてモータ軸8に差し込まれている。ロータ7は、ステッピングモータ3の出力軸となるシャフト7aを備えている。シャフト7aの回転が、伝達機構3cによって駆動ギヤ4に伝達される。モータブラケット3aに固定されたモータ軸8にロータ7を差し込んだ状態でロータ7を回転させるため、ロータ7の内径とモータ軸8との間には、クリアランスを持たせている。ロータ7は、自量のアンバランスにより、回転時に遠心力が発生してぶれながら回転する。
FIG. 4 is a perspective view of a stepping motor that realizes the left and right swing mechanism of the electric fan according to the first embodiment. FIG. 5 is an exploded perspective view of the stepping motor that realizes the left and right swing mechanisms of the electric fan according to the first embodiment. In the stepping motor 3, a motor shaft 8 is fixed perpendicularly to the bottom surface 3b of the motor bracket 3a. The rotor 7 provided with a permanent magnet on the surface of the cylindrical member is inserted into the motor shaft 8 with a gap between the rotor shaft 7 and the motor shaft 8. The rotor 7 includes a shaft 7 a that serves as an output shaft of the stepping motor 3. The rotation of the shaft 7a is transmitted to the drive gear 4 by the transmission mechanism 3c. In order to rotate the rotor 7 with the rotor 7 being inserted into the motor shaft 8 fixed to the motor bracket 3a, a clearance is provided between the inner diameter of the rotor 7 and the motor shaft 8. The rotor 7 rotates while being shaken due to a centrifugal force generated by rotation due to its own unbalance.
一方、モータ軸8は、製造時のばらつきによりステータ6の中心からずれて固定されていることがある。モータ軸8がステータ6の中心からずれている場合、ロータ7の外周とステータ6の内径との隙間に不均一が生じている。図6は、実施の形態1に係る扇風機のステッピングモータに不平衡磁気吸引力が発生している状態を示す図である。図6に示すように、通電の際、不平衡磁気吸引力が生じると、ロータ7には、特定の方向の力が強く働く。
On the other hand, the motor shaft 8 may be fixed off the center of the stator 6 due to variations in manufacturing. When the motor shaft 8 is deviated from the center of the stator 6, the gap between the outer periphery of the rotor 7 and the inner diameter of the stator 6 is uneven. FIG. 6 is a diagram illustrating a state in which an unbalanced magnetic attractive force is generated in the stepping motor of the electric fan according to the first embodiment. As shown in FIG. 6, when an unbalanced magnetic attractive force is generated during energization, a force in a specific direction acts strongly on the rotor 7.
図7は、実施の形態1に係る扇風機の左右の首振り機構を実現するステッピングモータの回転中の状態変化を示す図である。実施の形態1に係る扇風機100は、磁気吸引力によってロータ7が引っ張られないように、ロータ7の回転速度を遅くして遠心力を小さくしている。すなわち、遠心力を小さくして磁気吸引力が勝るようにし、磁気吸引力によって引っ張られる方向と同じ側にロータ7を引っ張った状態で回転させる。ロータ7は、磁気吸引力によって引っ張られる方向と同じ側に引っ張られながら回転するため、ロータ7の急激な移動がなく衝突は発生しない。
FIG. 7 is a diagram showing a state change during rotation of the stepping motor that realizes the left and right swing mechanism of the electric fan according to the first embodiment. In the electric fan 100 according to the first embodiment, the rotational speed of the rotor 7 is decreased to reduce the centrifugal force so that the rotor 7 is not pulled by the magnetic attractive force. That is, the centrifugal force is reduced so that the magnetic attractive force is superior, and the rotor 7 is rotated while being pulled to the same side as the direction pulled by the magnetic attractive force. Since the rotor 7 rotates while being pulled in the same direction as that pulled by the magnetic attractive force, the rotor 7 does not move rapidly and no collision occurs.
図7には、不平衡磁気吸引力が遠心力よりも大きいが、力の差が小さい場合のロータ17の回転状態の変化を合わせて示している。ロータ17が高速回転する際には、ロータ17はモータ軸18の外周に沿って回転しており、遠心力が働く方向にクリアランスが確保された状態で回転する。しかし、遠心力が不平衡磁気吸引力と逆方向を向いたとき、遠心力には、不平衡磁気吸引力に対する法線方向の成分が含まれなくなるため、ロータ17はステータ16に引っ張られ、ロータ17はモータ軸18又はステータ16といったステッピングモータの内部の部品と衝突する。ロータ17の衝突は、遠心力が不平衡磁気吸引力と逆方向を向いたときに起こる現象であるため、ロータ17の衝突は、1回転につき1回発生する。
FIG. 7 also shows changes in the rotational state of the rotor 17 when the unbalanced magnetic attractive force is larger than the centrifugal force but the difference in force is small. When the rotor 17 rotates at a high speed, the rotor 17 rotates along the outer periphery of the motor shaft 18 and rotates with a clearance secured in the direction in which the centrifugal force acts. However, when the centrifugal force is directed in the direction opposite to the unbalanced magnetic attractive force, the centrifugal force does not include a component in the normal direction with respect to the unbalanced magnetic attractive force. 17 collides with an internal part of the stepping motor such as the motor shaft 18 or the stator 16. Since the collision of the rotor 17 is a phenomenon that occurs when the centrifugal force is directed in the direction opposite to the unbalanced magnetic attractive force, the collision of the rotor 17 occurs once per rotation.
実施の形態1に係る扇風機100は、ロータ7の1分当たりの回転速度を70rpm程度に抑えることで、ロータ7に発生する遠心力を低減させる。遠心力はF=mrω2で定義されているため、ロータ7とロータ17とが同じ形状であるとき、ロータ7が70rpmで回転することによって発生する遠心力は、ロータ17が100rpmで回転することによって発生する遠心力の0.56倍程度であり、遠心力が半分強に低減される。このため、ロータ7の回転速度は、50rpmから100rpmの間とすることが好ましい。
The electric fan 100 according to the first embodiment reduces the centrifugal force generated in the rotor 7 by suppressing the rotational speed of the rotor 7 per minute to about 70 rpm. Since the centrifugal force is defined by F = mrω 2 , when the rotor 7 and the rotor 17 have the same shape, the centrifugal force generated by the rotation of the rotor 7 at 70 rpm means that the rotor 17 rotates at 100 rpm. Is about 0.56 times the centrifugal force generated by the pressure, and the centrifugal force is reduced to a little more than half. For this reason, it is preferable that the rotational speed of the rotor 7 is between 50 rpm and 100 rpm.
ロータ17の衝突によって発生する衝突音は、不平衡磁気吸引力と遠心力との差が小さいときに発生する事象である。すなわち、不平衡磁気吸引力が遠心力よりも勝っているが、回転時は遠心力によりロータ17がモータ軸18の外周に沿って回転する程度の力も持っているときに発生する事象である。実施の形態1に係る扇風機100のステッピングモータ3のロータ7に発生する遠心力は、ロータ17に発生する遠心力の半分強である。したがって、不平衡磁気吸引力と遠心力との差は、ロータ17よりもロータ7の方が大きくなるため、遠心力でロータ7がモータ軸8の外周に沿って回転することはなくなり、ロータ7は、決まった位置で不平衡磁気吸引力によって引っ張られ続けながら回転する。したがって、回転中のロータ7の急激な移動は避けられ、ロータ7の衝突による衝突音の発生が抑制される。
The collision sound generated by the collision of the rotor 17 is an event that occurs when the difference between the unbalanced magnetic attractive force and the centrifugal force is small. In other words, this phenomenon occurs when the unbalanced magnetic attractive force is superior to the centrifugal force, but when the rotor 17 also has a force to rotate along the outer periphery of the motor shaft 18 due to the centrifugal force. The centrifugal force generated in the rotor 7 of the stepping motor 3 of the electric fan 100 according to Embodiment 1 is a little more than half the centrifugal force generated in the rotor 17. Therefore, since the difference between the unbalanced magnetic attractive force and the centrifugal force is larger in the rotor 7 than in the rotor 17, the rotor 7 does not rotate along the outer periphery of the motor shaft 8 due to the centrifugal force. Rotates at a fixed position while being pulled by an unbalanced magnetic attractive force. Therefore, rapid movement of the rotating rotor 7 is avoided, and the generation of collision noise due to the collision of the rotor 7 is suppressed.
上記のようにロータ7が回転するのは、ロータ7とモータ軸8との間にクリアランスを設けているからであり、ロータ7とモータ軸8との間のクリアランスを極力小さくすることでロータ7の急激な移動は抑制される。しかし、ロータ7がプラスチックの成型品である場合は、ロータ7の寸法ばらつきが大きく、ロータ7の内径側のクリアランスを厳しく管理することは困難である。そこで、実施の形態1に係るステッピングモータ3は、ロータ7の衝撃音を低減する目的と、ロータ7の回転をスムーズにする目的とをかねて、ロータ7とモータ軸8との間のクリアランスにグリス9が充填されている。
The reason why the rotor 7 rotates as described above is that a clearance is provided between the rotor 7 and the motor shaft 8. By reducing the clearance between the rotor 7 and the motor shaft 8 as much as possible, the rotor 7 is rotated. The rapid movement of is suppressed. However, when the rotor 7 is a plastic molded product, the dimensional variation of the rotor 7 is large, and it is difficult to strictly manage the clearance on the inner diameter side of the rotor 7. Therefore, the stepping motor 3 according to the first embodiment has grease for the clearance between the rotor 7 and the motor shaft 8 for the purpose of reducing the impact noise of the rotor 7 and the purpose of smoothing the rotation of the rotor 7. 9 is filled.
また、ロータ7に発生する遠心力の原因は、ロータ7自量のアンバランスである。ロータ7の自重のアンバランスを抑えるには、ロータ7の寸法精度を上げる必要がある。ロータ7の内径側のクリアランスを厳しくすることは困難であるが、ロータ7の外径の寸法を管理することは比較的容易である。このため、実施の形態1に係るステッピングモータ3は、ロータ7とモータ軸8とのクリアランスの大きさは、ステータ6とロータ7との間の隙間以下となっている。したがって、ステッピングモータ3は、ロータ7の急激な移動があった場合でもロータ7とステータ6とが衝突することはない。なお、ステータ6内部のばらつき及びロータ7の振れも考慮し、ステータ6とロータ7との間の隙間の大きさを決定することで、ロータ7が衝突することによる衝突音の発生を低減する効果を高めることができる。
Also, the cause of the centrifugal force generated in the rotor 7 is an unbalance of the rotor 7 itself. In order to suppress the unbalance of the weight of the rotor 7, it is necessary to increase the dimensional accuracy of the rotor 7. Although it is difficult to tighten the clearance on the inner diameter side of the rotor 7, it is relatively easy to manage the dimension of the outer diameter of the rotor 7. For this reason, in the stepping motor 3 according to the first embodiment, the clearance between the rotor 7 and the motor shaft 8 is equal to or smaller than the gap between the stator 6 and the rotor 7. Accordingly, the stepping motor 3 does not collide between the rotor 7 and the stator 6 even when the rotor 7 moves suddenly. The effect of reducing the occurrence of collision noise due to the collision of the rotor 7 by determining the size of the gap between the stator 6 and the rotor 7 in consideration of the variation in the stator 6 and the vibration of the rotor 7. Can be increased.
実施の形態1に係る扇風機100は、ロータ7を不平衡磁気吸引力で引っ張り続けながら回転させるため、回転中のロータ7の急激な移動を避け、ロータ7の衝突による衝突音の発生を抑制することができる。
Since the electric fan 100 according to the first embodiment rotates the rotor 7 while continuing to pull the unbalanced magnetic attractive force, it avoids a sudden movement of the rotating rotor 7 and suppresses the generation of collision noise due to the collision of the rotor 7. be able to.
上記の説明において、扇風機100は、左右方向の首振り機構106を実現するステッピングモータ3でのロータ7の衝突による衝突音の発生を抑制しているが、電動機部102が備える上下方向の首振り機構105をステッピングモータで実現する場合には、ステッピングモータ3と同様に、ロータを不平衡磁気吸引力で引っ張り続けながら回転させることにより、衝突音の発生を抑制することができる。
In the above description, the electric fan 100 suppresses the generation of the collision sound due to the collision of the rotor 7 in the stepping motor 3 that realizes the horizontal swing mechanism 106, but the vertical swing of the electric motor unit 102 is provided. When the mechanism 105 is realized by a stepping motor, as with the stepping motor 3, it is possible to suppress the occurrence of a collision sound by rotating the rotor while continuing to pull it with an unbalanced magnetic attractive force.
以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。
The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
1 前ガード、2 後ガード、3 ステッピングモータ、3a モータブラケット、3b 底面、3c 伝達機構、4 駆動ギヤ、5 回動ギヤ、6,16 ステータ、7,17 ロータ、7a シャフト、8,18 モータ軸、9 グリス、33 ガードリング、100 扇風機、101 羽根車、102 電動機部、103 支柱部、104 台座部、105,106 首振り機構。
1 front guard, 2 rear guard, 3 stepping motor, 3a motor bracket, 3b bottom surface, 3c transmission mechanism, 4 drive gear, 5 rotation gear, 6,16 stator, 7,17 rotor, 7a shaft, 8,18 motor shaft , 9 grease, 33 guard ring, 100 electric fan, 101 impeller, 102 electric motor part, 103 strut part, 104 pedestal part, 105, 106 swing mechanism.
Claims (4)
- 羽根車と、
前記羽根車を回転させる電動機部と、
前記電動機部の向きを変動させる首振り動作を行わせる首振り機構とを備え、
前記首振り機構は、ステータと、前記ステータの内側に設置されたモータ軸と、前記モータ軸との間に隙間を設けて前記モータ軸に差し込まれたロータとを有するステッピングモータを備え、
前記ステッピングモータは、前記モータ軸が前記ステータの中心からずれることによって生じる不平衡磁気吸引力で前記ロータが引っ張られる方向と同じ側に引っ張られながら前記ロータが回転する速度で運転されることを特徴とする扇風機。 Impeller,
An electric motor section for rotating the impeller;
A swing mechanism that performs a swing motion that changes the direction of the electric motor unit,
The swing mechanism includes a stepping motor having a stator, a motor shaft installed inside the stator, and a rotor inserted into the motor shaft with a gap between the motor shaft,
The stepping motor is operated at a speed at which the rotor rotates while being pulled to the same side as the direction in which the rotor is pulled by an unbalanced magnetic attractive force generated by the motor shaft being displaced from the center of the stator. An electric fan. - 前記ロータと前記モータ軸との間のクリアランスに充填されたグリスを備えることを特徴とする請求項1に記載の扇風機。 The electric fan according to claim 1, further comprising grease filled in a clearance between the rotor and the motor shaft.
- 前記ロータと前記モータ軸との間のクリアランスは、前記ステータと前記ロータとの隙間以下であることを特徴とする請求項1又は2に記載の扇風機。 3. The electric fan according to claim 1, wherein a clearance between the rotor and the motor shaft is equal to or less than a gap between the stator and the rotor.
- 前記ロータの回転速度は、50rpmから100rpmの間であることを特徴とする請求項1から3のいずれか1項に記載の扇風機。 The electric fan according to any one of claims 1 to 3, wherein a rotation speed of the rotor is between 50 rpm and 100 rpm.
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JP2020508683A JPWO2019186859A1 (en) | 2018-03-29 | 2018-03-29 | Fan |
PCT/JP2018/013100 WO2019186859A1 (en) | 2018-03-29 | 2018-03-29 | Electric fan |
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