WO2009081531A1 - モータとそれを用いた電子機器 - Google Patents
モータとそれを用いた電子機器 Download PDFInfo
- Publication number
- WO2009081531A1 WO2009081531A1 PCT/JP2008/003708 JP2008003708W WO2009081531A1 WO 2009081531 A1 WO2009081531 A1 WO 2009081531A1 JP 2008003708 W JP2008003708 W JP 2008003708W WO 2009081531 A1 WO2009081531 A1 WO 2009081531A1
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- Prior art keywords
- motor
- extension
- permanent magnet
- steel sheet
- silicon content
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/187—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to inner stators
Definitions
- the present invention relates to a motor and an electronic device using the motor, and more particularly to a configuration of a stator of the motor.
- a paper feeding roller (driven body) provided in a main body case is connected to a motor, and the paper feeding roller is rotated by driving the motor to feed paper to a predetermined portion. ing.
- the brushless DC motor is generally used as the motor.
- the motor includes a stator in which a plurality of magnetic poles are arranged at a first predetermined interval on the outer peripheral portion, and a rotor arranged on the outer periphery of the stator.
- the inner periphery of the rotor has a structure in which permanent magnets magnetized with different polarities are arranged at every second predetermined interval.
- the magnetic pole of the stator is formed with an extension extending from the magnetic pole base portion in a direction substantially parallel to the permanent magnet, thereby increasing the driving efficiency.
- the width of the permanent magnet (direction perpendicular to the circumferential direction) is larger than the width of the stator in the same direction at the magnetic pole base in order to bring the permanent magnet as close as possible to the magnetic detection element that magnetically detects the rotation of the rotor.
- the extension part extended in the substantially parallel direction with the permanent magnet from the magnetic pole base part of a stator is formed.
- the facing area between the magnetic poles of the stator and the permanent magnet is increased to increase the driving force and driving efficiency.
- the motor of the present invention has a stator in which a plurality of magnetic poles are arranged at a first predetermined interval on the outer periphery, and is rotatably arranged on the outer periphery of the stator via a predetermined gap, and has a different polarity at every second predetermined interval. And a rotor having permanent magnets magnetized.
- the stator magnetic poles form an extension extending from the magnetic pole base in a direction substantially parallel to the permanent magnet. This extension consists of a high permeability electrical steel sheet with a silicon content of less than 3.0 wt%.
- the motor of the present invention does not generate magnetic saturation in the magnetic circuit connected to the magnetic pole, improves the driving efficiency, and realizes high efficiency and low power consumption.
- the present invention includes an electronic device including a main body case, a driven body provided in the main body case, and the motor connected to the driven body via a connecting mechanism.
- FIG. 1 is a side sectional view of a motor according to Embodiment 1 of the present invention.
- FIG. 2 is a perspective view showing the stator of the motor according to Embodiment 1 of the present invention.
- FIG. 3 is a front view showing the stator of the motor according to the first embodiment of the present invention.
- FIG. 4 is a partial enlarged front view showing the stator of the motor according to Embodiment 1 of the present invention.
- FIG. 5 is a diagram showing the relationship between the silicon content, hardness, and elongation of the motor according to Embodiment 1 of the present invention.
- FIG. 6 is a diagram showing the relationship between the silicon content of the motor and the eddy current loss in the first embodiment of the present invention.
- FIG. 1 is a side sectional view of a motor according to Embodiment 1 of the present invention.
- FIG. 2 is a perspective view showing the stator of the motor according to Embodiment 1 of the present invention.
- FIG. 3 is a
- FIG. 7 is a diagram showing the relationship between the motor rotation speed, iron loss, and copper loss in the first embodiment of the present invention.
- FIG. 8 is a diagram showing a comparison with FIG. 7, and is a diagram showing the relationship between the rotational speed of a conventional motor having no extension and iron loss and copper loss.
- FIG. 9 is a diagram showing the relationship between the rotational speed and the loss in comparison between the motor according to Embodiment 1 of the present invention and a conventional motor having no extension.
- FIG. 10 is a sectional side view of the motor according to the second embodiment of the present invention.
- FIG. 11 is a side sectional view of a motor showing another embodiment in the second embodiment of the present invention.
- FIG. 12 is a schematic explanatory diagram of an electronic apparatus according to Embodiment 3 of the present invention.
- FIG. 1 is a sectional view of a motor according to Embodiment 1 of the present invention
- FIG. 2 is a perspective view of a stator of the motor
- FIG. 3 is a front view of the stator
- FIG. 4 is a partially enlarged front view of the stator.
- the motor 2 is a so-called outer rotor type brushless DC motor.
- the motor 2 is disposed in a horizontal direction on a wiring board 1 of an electronic device (for example, a laser printer). As shown in FIGS. 1 and 2, the motor 2 is formed by laminating plate-like bodies 30 (for example, silicon steel plates) to form a laminated body 31 (stator core).
- the motor 2 includes a stator 3 including the laminated body 31 and a rotor 4 that is opposed to the outer peripheral surface of the stator 3 with a gap and is rotatably disposed on the outer periphery of the stator 3.
- the rotor 4 has a cylindrical shape whose lower surface is opened.
- a plurality of magnetic poles 3 a are arranged on the outer periphery of the stator 3 at a first predetermined interval corresponding to the number of magnetic poles.
- a coil 6 is wound around the magnetic circuit 3e portion on the inner peripheral side of each magnetic pole 3a, as shown in FIGS.
- a ring-shaped permanent magnet 5 that is alternately magnetized to the north and south poles (adjacent poles are different from each other) at a second predetermined interval according to the number of permanent magnets is bonded. It is fixed by. That is, the permanent magnet 5 is bonded to the inner peripheral surface of the rotor 4 on the outer peripheral surface thereof, and the inner peripheral surface is opposed to the magnetic pole 3a on the outer peripheral portion of the stator 3 via a gap.
- each magnetic pole 3 a is alternately magnetized to the N pole and the S pole, and an attractive force and a repulsive force are generated between the permanent magnet 5 existing on the outer periphery thereof. And it is comprised so that this may become the rotational drive force of the rotor 4.
- stator 3 is fixed to the wiring board 1 via the holding portion 3c.
- a plurality of bearings 7 are provided on the inner periphery of the stator 3.
- a drive shaft 8 is provided through the bearing 7 group portion in the vertical direction. The upper end of the drive shaft 8 is fixed to the top surface 4 a of the rotor 4.
- a Hall IC 9 is mounted as a magnetic detection element at a portion corresponding to the lower end of the permanent magnet 5 on the wiring board 1. As is well known, the Hall IC 9 detects the rotational position of the rotor 4 and also detects the rotational speed and the amount of rotation to control the rotational speed.
- the lower end thereof is extended to the vicinity of the Hall IC 9. Furthermore, in order to avoid a balance shift with respect to the stator 3 when the lower end of the permanent magnet 5 is extended downward in this way, the upper end of the permanent magnet 5 is also extended upward by the same amount.
- each magnetic pole 3 a of the stator 3 has a magnetic pole base portion 3 d, which is substantially parallel to the inner peripheral surface of the permanent magnet 5.
- the extension part 3b extended downward is integrally formed. That is, the extension portion 3b extends substantially parallel to the longitudinal direction of the drive shaft 8 from above and below the magnetic pole base portion 3d so as to face substantially parallel to the direction of the magnetic pole of the permanent magnet 5 in a substantially vertical direction. ing.
- the extension portion 3b is an outer peripheral portion of two plate-like bodies 30 including an upper surface and a lower surface (outermost layer) among the plurality of laminated plate-like bodies 30 constituting the laminate 31 of the stator 3. Are formed by being bent at a substantially right angle upward and downward in a direction substantially parallel to the inner peripheral surface of the permanent magnet 5, respectively.
- the outer peripheral portion of the plate-like body 30 on the upper and lower surfaces is substantially parallel to the permanent magnet 5.
- the extension part 3b is formed by bending at a substantially right angle in the upward and downward directions, respectively. Thereby, the opposing area with the permanent magnet 5 extended above and below becomes large as shown in FIG. As a result, a large driving force is applied to the rotor 4.
- extension length of the extension portion 3b extending upward and downward in the direction substantially parallel to the inner peripheral surface of the permanent magnet 5 is the same as the inner peripheral surface of the permanent magnet 5 of the magnetic pole base portion 3d.
- the length is substantially equal to or less than the length in the substantially parallel direction (B in FIG. 3).
- the extension length (A + A) of the extension portion 3b extending upward and downward in the direction substantially parallel to the inner peripheral surface of the permanent magnet 5 is set to the magnetic pole base portion.
- the length (B) in the direction substantially parallel to the inner peripheral surface of the permanent magnet 5 is 3d or less.
- a high-permeability electromagnetic steel sheet is used as the plate-like body 30 constituting the laminated body 31.
- the extension part 3b also becomes a high permeability electromagnetic steel sheet, and the eddy current generated in the extension part 3b is reduced.
- the high magnetic permeability electrical steel sheet has higher hardness than electromagnetic soft iron or the like, it is difficult to bend it. However, it becomes possible to bend by specifying the silicon content.
- FIG. 5 is a diagram showing the relationship between the silicon content, hardness and elongation of the high permeability electrical steel sheet of the extension 3b.
- FIG. 6 is a diagram showing the relationship between the silicon content and eddy current loss.
- the eddy current loss is a loss caused by an eddy current generated when the magnetic flux links the conductor.
- the silicon content is preferably in the range of 2.0 wt% to 3.0 wt%.
- the silicon content is preferably 0.3 wt% or more, and the silicon content is more preferably in the range of 1.0 wt% to 3.0 wt%.
- the silicon content is preferably 0.3 wt% or more and less than 3.0 wt%, and more preferably in the range of 1.0 wt% to 3.0 wt%. is there. That is, when a high permeability electromagnetic steel sheet having a silicon content of 1.0 wt% or more and 3.0 wt% or less is used as the plate-like body 30 of the extension portion 3b, it is possible to easily perform processing such as bending and Current loss can be reduced.
- a high permeability electrical steel sheet having a silicon content in the range of 1.0 wt% or more and 3.0 wt% or less can be expressed as 50A400 when the plate thickness is 0.5 mm when expressed by a JIS (Japanese Industrial Standard) product number. ⁇ 50A1000.
- a high magnetic permeability electrical steel sheet significantly reduces eddy current loss as compared with soft iron and cold rolled steel sheet.
- the rotor 4 constituting the motor according to the present embodiment is driven so as to rotate at a rotation speed of 3000 rpm or less. The reason for this will be described below.
- FIG. 7 is a diagram showing the relationship between the rotational speed of the motor according to the present invention and iron loss and copper loss.
- FIG. 8 is a diagram showing the relationship between the rotational speed of a conventional motor that does not have the extension 3b, and iron loss and copper loss. 7 and 8 show the results of measurement using a high permeability electrical steel sheet having a silicon content of 2.1 wt%.
- FIG. 9 is a diagram showing the relationship between the rotational speed and the loss W (iron loss Wfe + copper loss Wcu) in the case of the motor 2 according to the present invention and the case of a conventional motor that does not have the extension 3b. .
- the iron loss Wfe is a loss obtained by combining the hysteresis loss Wh and the eddy current loss We.
- the hysteresis loss Wh is a frequency multiple of the loss obtained from the area drawn by the DC hysteresis loop.
- the eddy current loss We is Joule loss that occurs when an electric field is generated by electromagnetic induction in a magnetic body when magnetic flux is linked to the magnetic body, and the current flows back.
- the copper loss Wcu is a loss generated in the copper wire due to the resistance of the winding when a current is passed through the winding.
- the conventional motor having no extension 3b is a motor having no extension 3b in the motor 2 of the present invention.
- the only difference between this conventional motor and the motor 2 according to the present invention is the presence or absence of the extension 3b.
- the motor 2 according to the present invention when compared with the copper loss Wcu, has a constant value of about 5 W, whereas the conventional motor has a constant value of about 11 W, which is about twice that value.
- the difference in the copper loss Wcu between the motor 2 according to the present invention and the conventional motor is as follows.
- the motor torque T is proportional to the coefficient Kt and the current I.
- the coefficient Kt is proportional to the magnetic flux amount ⁇ . Therefore, since the motor 2 according to the present invention has the extension 3b, the magnetic flux amount ⁇ is larger than that of the conventional motor. Then, the coefficient Kt corresponding to the motor 2 according to the present invention is larger than the coefficient Kt corresponding to the conventional motor.
- the current I of the motor 2 according to the present invention is smaller than the current I of the conventional motor. For this reason, the copper loss Wcu of the motor 2 according to the present invention is smaller than the copper loss Wcu of the conventional motor.
- the motor 2 according to the present invention rises at a rate of about 4 W / 1000 rpm almost constant while the rotational speed is from 1000 rpm to 4000 rpm.
- the conventional motor is rising at a rate of about 2 W / 1000 rpm, which is about 1/2 of the rate of increase of the motor 2 according to the present invention.
- the difference in the iron loss Wfe between the motor 2 according to the present invention and the conventional motor is as follows.
- the iron loss Wfe changes when the value of the magnetic flux density B changes when the rotational speed f is the same. Therefore, since the motor 2 according to the present invention has the extension 3b, it is easy to take in the magnetic flux. For this reason, the motor 2 according to the present invention has a higher magnetic flux density B than the conventional motor. And the iron loss Wfe of the motor 2 which concerns on this invention becomes larger than the iron loss Wfe of the conventional motor.
- the motor 2 according to the present invention and the conventional motor are compared with respect to the loss W obtained by combining the copper loss Wcu and the iron loss Wfe. Then, when the rotation speed is 3000 rpm or less, the motor 2 according to the present invention has a lower loss than the conventional motor. On the other hand, when it exceeds 3000 rpm, the loss of the motor 2 according to the present invention is higher than that of the conventional motor.
- a motor is used for feeding a document in a range where the rotation speed is 3000 rpm or less.
- the motor 2 according to the present invention is particularly effective for paper feeding of documents in this laser printer.
- the extension 3b is formed by bending the upper and lower surface (outermost layer) plate-like bodies 30 of the laminated plate-like bodies 30 (high permeability magnetic steel sheets) constituting the laminate 31 of the stator 3. Although described, it is not necessarily limited to the same material. That is, the extension part 3b may be made of a material different from the laminated plate-like bodies constituting the laminated body.
- the laminated plate-like body constituting the laminated body of the stator 3 uses a high-permeability electrical steel sheet having a high silicon content in the range up to the laminated magnetic pole base 3d.
- the extension 3b extending from the magnetic pole base 3d is a high-permeability electrical steel sheet having the same or low silicon content as compared with the laminated plate-like body.
- the magnetic pole of the stator is provided with an extension extending from the magnetic pole base in a direction substantially parallel to the permanent magnet.
- the extension length of the extension portion in a direction substantially parallel to the permanent magnet is equal to or less than the length of the magnetic pole base portion in a direction substantially parallel to the permanent magnet, and the extension portion has a silicon content of less than 3.0 wt%, preferably
- the high magnetic permeability electrical steel sheet is in the range of 0.3 wt% to 3.0 wt%, more preferably in the range of 1.0 wt% to 3.0 wt%.
- FIG. 10 is a side sectional view showing the motor 2a according to the second embodiment of the present invention.
- the same constituent elements as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the motor 2a in the present embodiment is different from the motor 2 in the first embodiment in that an upper extension 3g and a lower extension 3h are provided instead of the upper and lower extensions 3b in the first embodiment.
- a Hall IC 9 a is mounted as a magnetic detection element on the portion corresponding to the lower end of the permanent magnet 5 on the wiring board 1. That is, the Hall IC 9 a is arranged on the lower surface of the wiring board 1 so as to face the permanent magnet 5.
- the upper extension 3g is on the opposite side of the Hall IC 9a
- the lower extension 3h is on the Hall IC 9a side
- the upper extension 3g and the lower extension 3h are asymmetric in cross-sectional shape. It is bent.
- the lower extension portion 3h has a structure in which the bent tip end portion of the extension portion is arranged on the inner peripheral side of the stator 3 as compared with the upper extension portion 3g. That is, the gap with the permanent magnet 5 is larger in the lower extension 3h than in the upper extension 3g.
- the magnetic flux taken into the lower extension 3h on the side where the Hall IC 9a serving as the magnetic detection element is mounted is, for example, compared to a case where the lower extension 3h is bent substantially perpendicularly downward from the magnetic pole base 3d. And less. For this reason, the magnetic flux component reduced in the magnetic flux taken into the lower extension 3h is supplied to the Hall IC 9a. As a result, the Hall IC 9a can be mounted on the lower surface of the wiring board 1 as shown in FIG. 10, which can contribute to the miniaturization of the motor.
- the lower extension 3h is arranged so that the bent tip of the extension is closer to the inner peripheral side of the stator 3 than the upper extension 3g. It is good also as an extension part which made the mutual cross-sectional shape asymmetric with this structure.
- FIG. 11 is a side sectional view of a motor 2b showing another embodiment of the second embodiment.
- the same constituent elements as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the lower extension 3n on the Hall IC 9b side is configured so that the number of plate-like bodies 30 constituting the extension is smaller than the upper extension 3m on the opposite side of the Hall IC 9b.
- the upper extension portion 3m substantially includes two laminated plate-like bodies 30 including the outermost layer
- the lower extension portion 3n substantially includes the one outermost layer plate-like body 30 and the permanent magnet 5. It is configured to be bent at a substantially right angle so as to be parallel to the horizontal axis.
- the Hall IC 9b can be mounted on the lower surface of the wiring board 1, as shown in FIG. 11, and can contribute to the miniaturization of the motor.
- the lower extension is configured to have a length that is shorter than the upper extension.
- FIG. 12 is a schematic explanatory diagram of an electronic device (for example, a laser printer) according to Embodiment 3 of the present invention.
- the motor 2 described in the first embodiment is mounted on the wiring board 1.
- the wiring board 1 is also mounted with electronic components (not shown) necessary for the entire electronic device.
- the lower end of the drive shaft 8 of the motor 2 passes through a through hole 1a (shown in FIG. 1) of the wiring board 1 and extends to the lower part of the wiring board 1, and a gear box 21 is connected to the lower part of the driving shaft 8. Yes.
- a magnetic detection element (Hall IC) 9 is mounted on the wiring board 1 and the position of the rotor 4 is detected.
- the motor 2 is driven to rotate at a rotation speed of 3000 rpm or less, and this rotation is decelerated by the gear box 21.
- the rotational driving force of the motor 2 is further transmitted to the driven body 23 including a plurality of paper feed rollers 24 via the coupling mechanism 22. As a result, the plurality of paper feeding rollers 24 are rotated, and paper feeding is performed.
- the electronic device of the present embodiment may be configured to include the motor 2a or 2b described in the second embodiment, instead of the motor 2.
- the electronic apparatus of this embodiment it is possible to improve driving efficiency and achieve high efficiency and low power consumption.
- the driving efficiency can be improved, and high efficiency and low power consumption can be realized. Therefore, the motor can be widely applied to electronic devices such as laser printers.
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Abstract
Description
2 モータ
3 ステータ
3a 磁極
3b 延長部
3d 磁極基部
3c 保持部
3e 磁気回路
3g,3m 上延長部
3h,3n 下延長部
4 ロータ
5 永久磁石
6 コイル
7 ベアリング
8 駆動軸
9 磁気検出素子(ホールIC)
20 本体ケース
22 連結機構
23 被駆動体
30 板状体
31 積層体
図1は本発明の実施の形態1におけるモータの断面図、図2は同モータのステータの斜視図、図3は同ステータの正面図、図4は同ステータの部分拡大正面図である。モータ2は、いわゆるアウターロータ形のブラシレスDCモータである。
図10は、本発明の実施の形態2におけるモータ2aを示す側断面図である。実施の形態1と同一の構成要素は、同一の参照符号を付し説明を省略する。
図12は本発明の実施の形態3における電子機器(例えば、レーザプリンタ)の概略説明図である。図12において、実施の形態1にて説明したモータ2は、配線基板1に搭載されている。そして、この配線基板1には、電子機器全体に必要な電子部品(図示しない)なども一緒に搭載されている。
Claims (17)
- 外周部に複数の磁極を第一の所定間隔で配置したステータと、
前記ステータの外周に所定の空隙を介して回転自在に配置され、第二の所定間隔ごとに異極に着磁された永久磁石を有するロータとを備え、
前記ステータの磁極は、磁極基部から前記永久磁石と略平行方向に伸ばした延長部を形成し、前記延長部は、珪素含有率が3.0wt%未満の高透磁率電磁鋼板から成ることを特徴とするモータ。 - 前記高透磁率電磁鋼板の前記珪素含有率を0.3wt%以上としたことを特徴とする請求項1に記載のモータ。
- 前記高透磁率電磁鋼板の前記珪素含有率を1.0wt%から3.0wt%までの範囲としたことを特徴とする請求項1に記載のモータ。
- 前記高透磁率電磁鋼板の前記珪素含有率を2.0wt%から3.0wt%までの範囲としたことを特徴とする請求項1に記載のモータ。
- 前記ロータは、回転数が3000rpm以下で回転するように駆動されることを特徴とする請求項1に記載のモータ。
- 前記磁極基部は、珪素を含有する高透磁率電磁鋼板から成り、
前記延長部の前記高透磁率電磁鋼板の珪素含有率は、前記磁極基部の珪素含有率と比べて同等または低いことを特徴とする請求項1に記載のモータ。 - 前記延長部は、前記磁極基部の両側にそれぞれ設け、両側に設けた前記延長部の前記永久磁石と平行方向の合計延長長さは、前記磁極基部の永久磁石と平行方向の長さ以下であることを特徴とする請求項1から請求項6のいずれか1項に記載のモータ。
- 前記永久磁石の一端に対応する位置に設けられ、前記ロータの回転位置を検出する磁気検出素子をさらに備え、
前記延長部は、前記磁気検出素子と反対側の上延長部と前記磁気検出素子側の下延長部とから成り、前記空隙は、前記上延長部側よりも前記下延長部側の方が大きいことを特徴とする請求項1から請求項6のいずれか1項に記載のモータ。 - 前記永久磁石の一端に対応する位置に設けられ、前記ロータの回転位置を検出する磁気検出素子をさらに備え、
前記延長部は、前記磁気検出素子と反対側の上延長部と前記磁気検出素子側の下延長部とから成り、前記下延長部を構成する前記高透磁率電磁鋼板の枚数は、前記上延長部を構成する前記高透磁率電磁鋼板の枚数よりも少ないことを特徴とする請求項1から請求項6のいずれか1項に記載のモータ。 - 前記下延長部を構成する前記高透磁率電磁鋼板は1枚で、前記上延長部を構成する前記高透磁率電磁鋼板は2枚で構成されることを特徴とする請求項9に記載のモータ。
- 本体ケースと、前記本体ケース内に設けた被駆動体と、前記被駆動体に連結機構を介して連結したモータとを備えた電子機器であって、
前記モータは、
外周部に複数の磁極を第一の所定間隔で配置したステータと、
前記ステータの外周に所定の空隙を介して回転自在に配置され、第二の所定間隔ごとに異極に着磁された永久磁石を有するロータとを備え、
前記ステータの磁極は、磁極基部から前記永久磁石と略平行方向に伸ばした延長部を形成し、前記延長部は、珪素含有率が3.0wt%未満の高透磁率電磁鋼板より成ることを特徴とする電子機器。 - 前記高透磁率電磁鋼板の前記珪素含有率を0.3wt%以上としたことを特徴とする請求項11に記載の電子機器。
- 前記高透磁率電磁鋼板の前記珪素含有率を1.0wt%から3.0wt%までの範囲としたことを特徴とする請求項11に記載の電子機器。
- 前記高透磁率電磁鋼板の前記珪素含有率を2.0wt%から3.0wt%までの範囲としたことを特徴とする請求項11に記載の電子機器。
- 前記モータは、回転数が3000rpm以下で回転するように駆動されることを特徴とする請求項11に記載の電子機器。
- 前記本体ケース内にさらに配線基板を設け、前記モータは前記配線基板に搭載されると共に、前記配線基板には前記永久磁石に対向する部分に、前記ロータの回転位置を検出する磁気検出素子が配置されていることを特徴とする請求項11に記載の電子機器。
- 前記磁気検出素子は、ホールICであることを特徴とする請求項16に記載の電子機器。
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US12/744,159 US8410654B2 (en) | 2007-12-21 | 2008-12-11 | Motor and electronic device using same |
CN2008801179825A CN101878579B (zh) | 2007-12-21 | 2008-12-11 | 电动机和使用该电动机的电子设备 |
KR1020107011138A KR101117428B1 (ko) | 2007-12-21 | 2008-12-11 | 모터와 그것을 이용한 전자기기 |
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JP2007329713A JP5369433B2 (ja) | 2007-12-21 | 2007-12-21 | モータ |
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US (1) | US8410654B2 (ja) |
JP (1) | JP5369433B2 (ja) |
KR (1) | KR101117428B1 (ja) |
CN (1) | CN101878579B (ja) |
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JP5807143B2 (ja) * | 2010-01-18 | 2015-11-10 | パナソニックIpマネジメント株式会社 | モータとそれを用いた電子機器 |
US20140009030A1 (en) * | 2012-07-06 | 2014-01-09 | Chu-hsien Chou | Fan stator structure |
CN103825408A (zh) * | 2014-02-28 | 2014-05-28 | 深圳市大疆创新科技有限公司 | 电机、应用电机的云台和应用云台的拍摄装置 |
FR3038935B1 (fr) * | 2015-07-17 | 2020-11-13 | Ntn Snr Roulements | Systeme comprenant un rotor monte en rotation par rapport a un organe fixe |
JP7096016B2 (ja) | 2018-03-09 | 2022-07-05 | Jfeスチール株式会社 | 電磁鋼板の製造方法 |
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- 2008-12-11 US US12/744,159 patent/US8410654B2/en not_active Expired - Fee Related
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KR20100077034A (ko) | 2010-07-06 |
JP5369433B2 (ja) | 2013-12-18 |
KR101117428B1 (ko) | 2012-03-13 |
US8410654B2 (en) | 2013-04-02 |
US20100244637A1 (en) | 2010-09-30 |
JP2009153309A (ja) | 2009-07-09 |
CN101878579A (zh) | 2010-11-03 |
CN101878579B (zh) | 2013-07-31 |
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