WO2013058100A1 - 永久磁石モータおよび洗濯機 - Google Patents
永久磁石モータおよび洗濯機 Download PDFInfo
- Publication number
- WO2013058100A1 WO2013058100A1 PCT/JP2012/075520 JP2012075520W WO2013058100A1 WO 2013058100 A1 WO2013058100 A1 WO 2013058100A1 JP 2012075520 W JP2012075520 W JP 2012075520W WO 2013058100 A1 WO2013058100 A1 WO 2013058100A1
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- stator core
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- stator
- magnet motor
- permanent 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2791—Surface mounted magnets; Inset magnets
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
Definitions
- the present embodiment relates to a permanent magnet motor including a plurality of permanent magnets as magnetic poles on a rotor and a washing machine including the permanent magnet motor.
- a permanent magnet motor is used as a motor that rotationally drives a drum as a washing machine load.
- the permanent magnet motor is formed into a flat, covered cylindrical container with a magnetic material such as an iron plate.
- the inner peripheral side portion is located outside the peripheral portion of the stator.
- a plurality of (many) permanent magnets are arranged on the entire circumference on the inner circumferential surface of the inner circumferential side portion which is the stator side of the frame. This permanent magnet is generally rectangular and is generally oriented so that the magnetic flux simply flows linearly in the width direction (the radial direction of the stator).
- stator side surface is formed in an arc shape with the center protruding toward the stator side.
- the frame is required to have a sufficient thickness as a back yoke that sufficiently circulates the magnetic flux flowing from one permanent magnet to the opposite stator side.
- a ring is added as a back yoke to the peripheral side portion that is the anti-stator of the frame. While increasing the size, it is moderately retained, and the amount is compensated by a ring so that the magnetic flux is sufficiently recirculated.
- the frame needs to have a relatively large thickness, and a ring is also required. A large volume of the mold layer is also required. As a result, the overall size is increased, the weight is increased, the inertia torque is increased, and the characteristics of the electric motor are deteriorated and folded, and the cost is increased.
- a rotor is provided with a permanent magnet made of a sintered body of magnetic powder in which the flow of magnetic flux is oriented anisotropically, and a plurality of the permanent magnets are placed on the stator side of the frame made of magnetic material.
- Permanent magnet motors that are arranged alternately are considered. According to this, the flow of the magnetic flux of the permanent magnet is oriented in an extremely anisotropic manner, and the magnetic fluxes that flow through one permanent magnet are transferred to the adjacent permanent magnets because the polarities are alternately arranged differently. Most of it flows and is sufficiently refluxed, and the amount of reflux that flows through the frame is reduced.
- the frame does not need a thickness as a back yoke, and a ring as a back yoke is not necessary. Furthermore, only a small volume of the synthetic resin mold layer is required. As a result, the overall size can be reduced, the weight thereof is reduced, and the cost is reduced.
- a permanent magnet motor capable of generating high torque while reducing size, weight and cost, and a washing machine using the permanent magnet motor are provided.
- the permanent magnet motor of this embodiment includes a stator in which a stator coil is wound around a stator core, and a substantially rectangular block-shaped permanent magnet that forms a plurality of magnetic poles having different polarities on the side corresponding to the stator core of the frame.
- the permanent magnets constituting the plurality of magnetic poles are arranged such that the length direction is located on the circumferential side of the stator core and the width direction is located on the radial side of the stator core.
- the permanent magnets constituting the plurality of magnetic poles are made of a sintered powder of magnetic powder, and both end portions in the thickness direction are set to have a thickness dimension protruding from both end portions in the thickness direction of the stator core.
- the magnetic flux flows in the circumferential direction on the anti-stator core side in the length direction side and in the radial direction on the stator core side, and the magnetic flux increases in the thickness direction side on the anti-stator core side. And wherein the oriented to flow in the radial direction in the direction the flow stator core side.
- the washing machine of the present embodiment is characterized in that the washing machine load is rotationally driven by the permanent magnet motor described above.
- FIG. 1 shows an embodiment, (a) is a partially enlarged sectional view of a stator and a rotor, and (b) is a magnetic characteristic diagram of a permanent magnet.
- Perspective view of permanent magnet motor Partial enlarged perspective view of stator and rotor (A) is a figure which shows the arrangement
- (b) is a magnetic characteristic figure of the permanent magnet for N poles
- A) is a figure which shows the arrangement
- (b) is a magnetic characteristic figure of the permanent magnet for S poles 1 shows a schematic configuration of a drum type washing machine, (a) is a longitudinal side view, (b) is a longitudinal rear view.
- the water tank 2 is arrange
- the water tank 2 has a substantially cylindrical shape in which the rear surface portion 2a (the right end surface portion in FIG. 6A), which is one end, is closed, and is elastically supported by a damper mechanism (not shown) in a state where the axial direction is substantially horizontal.
- the drum 3 which comprises a rotation tank is arrange
- the drum 3 also has a substantially cylindrical shape in which the rear surface portion 3a (the right end surface portion in FIG.
- the front portion 1a of the outer box 1 is provided with a door for opening and closing the laundry doorway, and an opening is formed on the front side of the water tub 2 and the drum 3 so that the laundry can be washed.
- the drum 3 is taken in and out through the material entrance.
- a permanent magnet motor 4 (hereinafter simply referred to as a motor 4) for rotating the drum 3 is disposed on the back surface of the rear surface portion 2a of the water tank 2.
- the motor 4 is an outer rotor type brushless DC motor, and a shaft 6 connected to the rotor 5 is connected to the rear portion of the drum 3. Therefore, a direct drive system in which the drum 3 is directly rotated by the motor 4 is employed.
- the drum 3 corresponds to a washing machine load that is rotationally driven by the motor 4.
- the stator 7 of the motor 4 includes a stator core 9 having a large number of teeth portions 8 on the outer peripheral portion, a stator coil 10 wound around each teeth portion 8, and a synthetic resin mounting portion 11. And attached to the rear surface portion 2a of the water tank 2 in a fixed state via the attachment portion 11.
- the number of teeth portions 8 is, for example, 36.
- the rotor 5 has a shallow container-like frame 12 made of a magnetic material having an annular wall 12a on the outer peripheral portion, and a total of 48 permanent magnets arranged on the inner peripheral portion of the annular wall 12a. 14 and 15, and a synthetic resin mold layer 13 (see FIGS. 1 and 3) for fixing these permanent magnets 14 and 15 to the annular wall 12a.
- the shaft 6 is connected to the provided shaft mounting portion 16.
- the permanent magnet 14 is for the north pole where the stator 7 side (tooth portion 8 side of the stator core 9) is the north pole, and the permanent magnet 15 is for the south pole where the stator 7 side is the south pole.
- the permanent magnets 14 and 15 are formed in a substantially rectangular block shape, and the circumferential direction of the frame 12 (stator core 9) is in the length direction and the radial direction is in the width direction. 4 and 5, the thickness dimension Lm of the permanent magnets 14 and 15 is set to be larger than the thickness dimension Ls of the stator core 9 of the stator 7, and both end portions in the thickness direction are stator cores. 9 protrudes from both end portions in the thickness direction.
- the permanent magnets 14 and 15 are overlapped with the stator core 9.
- the surface of the permanent magnet 14 on the side corresponding to the stator core 9 of the stator 7 (the surface on the N pole side) is centered along the outer periphery of the stator 7 (stator core 9), as shown in FIG. It is formed in a concave arcuate shape to form an arcuate surface 14a, and corners at both ends in the length direction are cut away to form a notch 14b.
- the surface of the permanent magnet 15 corresponding to the stator core 9 of the stator 7 (surface on the S pole side) is centered along the outer periphery of the stator 7 (stator core 9) as shown in FIG. Is formed into a concave arcuate shape to form an arcuate surface 15a, and corners at both ends in the length direction are cut away to form a notch 15b.
- the permanent magnets 14 and 15 constituting the plurality of magnetic poles are composed of neodymium magnets or ferrite magnets obtained by sintering magnetic powder, and the flow of the magnetic flux ⁇ is that of the stator 7 on both the length direction side and the thickness direction side. It is oriented in an anisotropy concentrated in the center on the stator core 9 side. That is, as shown in FIG.
- the magnetic flux ⁇ flows in the circumferential direction from both ends on the annular wall 12a side (anti-stator core 9 side), and on the stator 7 side ( The magnetic flux ⁇ flows radially from the center of the stator 7 side (stator core 9 side) to the center of the stator core 9 side, and the annular wall 12a side ( Oriented so as to flow in the circumferential direction toward both ends of the anti-stator core 9 side.
- the magnetic flux distribution on the surface of the permanent magnets 14 and 15 on the side corresponding to the stator core 9 of the stator 7 is a sinusoidal shape as shown in FIG.
- the magnetic flux ⁇ is from both ends in the thickness direction on the annular wall 12 a (see FIG. 2) side (anti-stator core 9 side). Flowing in the thickness direction, flowing in the radial direction toward the center of the stator 7 on the stator core 9 side, and on the thickness direction side of the permanent magnet 15 for the S pole, as shown in FIG. It is oriented so that it flows radially from the center on the stator core 9 side and flows in the thickness direction to both ends in the thickness direction on the annular wall 12a (see FIG. 2) side (on the side opposite the stator core 9).
- the magnetic flux distributions on the surfaces of the permanent magnets 14 and 15 corresponding to the stator core 9 are both sinusoidal as shown in FIGS. 4B and 5B.
- the orientation and sintering of the permanent magnets 14 and 15 formed by sintering the magnetic powder is performed by, for example, putting the magnetic powder in a cavity in the mold together with water to be in a free state.
- the magnetic powder is pressed and hardened with discharge of water in the cavity while applying a magnetic field so that it flows as shown in FIG.
- the motor 4 is controlled by a control device including a microcomputer via an inverter circuit (not shown).
- the control device has a function of controlling the washing operation described later.
- the control device When starting the washing operation, the control device first performs a water supply stroke. In the water supply stroke, a water supply valve (not shown) is opened and water is supplied into the water tank 2 and then into the drum 3 to be stored. Next, a washing process is performed. In the washing step, the drum 3 is rotated forward and backward by the motor 4 at a low rotational speed of, for example, 50 to 60 rpm while the detergent is put into the water tank 2. Thereby, the laundry accommodated in the drum 3 is washed. After performing a washing process for a predetermined time, a draining process is performed. In the drainage process, the water in the tank 2 (inside the drum 3) is discharged out of the machine by opening the drain valve (not shown) connected to the discharge port of the tank 2 while the drum 3 is stopped. To do.
- the water supply process is performed again, and water is supplied into the water tank 2 and then into the drum 3 to be stored.
- a rinsing process is performed.
- the same control as in the washing process is performed except that no detergent is used. That is, the laundry in the drum 3 is rinsed by rotating the drum 3 forward and backward with the motor 4 at a low rotational speed of, for example, 50 to 60 rpm. Thereafter, a drainage process similar to that described above is performed.
- a dehydration process is performed.
- the drum 3 is rotated in one direction by the motor 4 at a high speed of, for example, 1000 rpm. Thereby, the laundry in the drum 3 is centrifugally dehydrated. Thus, the washing operation ends.
- the thickness dimension Lm of the permanent magnets 14 and 15 is set larger than the thickness dimension Ls of the stator core 9 of the stator 7, and both end portions in the thickness direction of the stator core 9.
- the permanent magnets 14 and 15 project from the both ends in the thickness direction, and the permanent magnets 14 and 15 are arranged in the center on the stator 7 side (stator core 9 side) in both the length direction side and the thickness direction side. Since the magnetic flux distribution acting on the teeth portion 8 of the stator 7 becomes a sine wave shape and a stronger magnetic force acts, the high torque can be generated. It is suitable as a motor 4 that performs a washing and rinsing process requiring low speed and high torque.
- the permanent magnets 14 and 15 are arranged so that the polarities are alternately changed, most of the magnetic flux ⁇ flowing through one permanent magnet flows to the adjacent permanent magnets and is sufficiently returned to the frame 12. The amount of reflux through the flow is reduced. Therefore, the frame 12 does not need a thickness as a back yoke, and a ring as a back yoke is not necessary. Furthermore, only a small volume of the synthetic resin mold layer 13 is required. As a result, the motor 4 can generate a high torque while being reduced in size, weight, and cost.
- the surfaces of the permanent magnets 14 and 15 corresponding to the stator core 9 of the stator 7 are formed on the arc surfaces 14a and 15a along the stator core 9, the air gap between the stator 7 and the stator 7 can be minimized, The volume of the rotor 5 can be minimized while allowing the magnetic force to act efficiently on the stator coil 10. Since the surfaces corresponding to the stator core 9 of the permanent magnets 14 and 15 are formed on the circular arc surfaces 14a and 15a, the air resistance of the rotation of the rotor 5 is small, and the generation of noise due to turbulence can be prevented. Furthermore, since the corners at both ends of the arcuate surfaces 14a and 15a of the permanent magnets 14 and 15 are cut away to form the notches 14b and 15b, the change in magnetic characteristics due to the demagnetizing action at the corners. Can be prevented.
- the motor 4 is not limited to the outer rotor type, and may be an inner rotor type.
- the washing machine can be applied to a washing / drying machine having a drying function.
- the washing machine is not limited to a drum-type washing machine, and can be applied to a vertical washing machine in which a rotating tub is directed vertically.
- the permanent magnet motor rotates the stirrer that stirs the laundry in the washing process and the rinsing process at a low speed in the forward and reverse directions, and in the dehydration process, the stirrer and the rotating tub are integrally rotated at a high speed in one direction.
- the washing machine load driven by the permanent magnet motor is a stirring body and a rotating tub.
- a stator formed by winding a stator coil around a stator core, and a substantially rectangular block-shaped permanent magnet that constitutes a plurality of magnetic poles having different polarities alternately on the side corresponding to the stator core of the frame.
- the permanent magnets that constitute the plurality of magnetic poles are arranged such that the length direction is located on the circumferential side of the stator core and the width direction is located on the radial side of the stator core.
- the permanent magnets constituting the plurality of magnetic poles are made of sintered magnetic powder, and both end portions in the thickness direction are set to a thickness dimension that protrudes from both end portions in the thickness direction of the stator core.
- the magnetic flux flows in the circumferential direction on the anti-stator core side in the longitudinal direction and flows in the radial direction on the stator core side, and the magnetic flux increases in the thickness direction on the anti-stator core side. And wherein the oriented to flow in the radial direction in the direction the flow stator core side.
- 1 is an outer case
- 3 is a drum (washing machine load)
- 4 is a permanent magnet motor
- 5 is a rotor
- 7 is a stator
- 8 is a teeth portion
- 9 is a stator core
- 10 is a stator coil
- 13 is a mold layer
- Reference numeral 14 denotes an N pole permanent magnet
- 15 denotes an S pole permanent magnet.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
以下、ドラム式の洗濯機に適用した一実施形態について図面を参照して説明する。
まず、図6において、洗濯機の外箱1内には水槽2が配設されている。水槽2は、一端部である後面部2a(図6(a)の右端面部)が閉塞されたほぼ円筒状をなし、軸方向をほぼ水平にした状態で図示しないダンパ機構により弾性的に支持されている。水槽2内には、回転槽を構成するドラム3が回転自在に配設されている。このドラム3も、一端部である後面部3a(図6(a)の右端面部)が閉塞されたほぼ円筒状をなし、軸方向をほぼ水平にした状態で配設されている。ドラム3の周壁には、多数の孔(図示せず)が形成されている。なお、図示はしないが、外箱1の前面部1aには洗濯物出入口を開閉する扉が設けられ、また、水槽2およびドラム3の前面側に開口部が形成されていて、洗濯物が洗濯物出入口を通してドラム3に対して出し入れされるようになっている。
モータ4のステータ7は、外周部に多数個のティース部8を有するステータコア9と、各ティース部8に巻回されたステータコイル10と、合成樹脂製の取付部11とを備えた構成となっていて、その取付部11を介して前記水槽2の後面部2aに固定状態に取り付けられる。ティース部8の数は例えば36個となっている。
制御装置は、洗濯運転を開始すると、まず、給水行程を行なう。給水行程では、給水弁(図示せず)を開放して水を水槽2内ひいてはドラム3内に供給して貯留する。次に、洗い行程を行なう。洗い行程では、水槽2内に洗剤を投入した状態で、ドラム3をモータ4により例えば50~60rpmの低い回転速度で正逆回転させる。これにより、ドラム3内に収容された洗濯物が洗われる。洗い行程を所定時間行なった後、排水行程を行なう。排水行程では、ドラム3を停止させた状態で、水槽2の排出口に接続された排水弁(図示せず)を開放することにより、水槽2内(ドラム3内)の水を機外へ排出する。
モータ4としてはアウタロータ形に限られず、インナロータ形でもよい。
洗濯機としては、乾燥機能を備えた洗濯乾燥機にも適用できる。
Claims (5)
- ステータコアにステータコイルを巻回してなるステータと、フレームの前記ステータコアに対応する側に極性が交互に異なる複数の磁極を構成するほぼ矩形ブロック状の永久磁石を配列してなるロータとを備えた永久磁石モータにおいて、
前記複数の磁極を構成する永久磁石は、長さ方向が前記ステータコアの周方向側に位置し、幅方向が該ステータコアの径方向側に位置するようにして配設され、且つ、厚さ方向の両端部が前記ステータコアの厚さ方向の両端部より突出する厚さ寸法に設定され、
前記複数の磁極を構成する永久磁石は、磁性粉末の焼結体からなっていて、長さ方向側において磁束が反ステータコア側で周方向に流れステータコア側で径方向に流れ、厚さ方向側において磁束が反ステータコア側で厚さ方向に流れステータコア側で径方向に流れるように配向したことを特徴とする永久磁石モータ。 - 永久磁石のステータコア側の面は、該ステータコアに沿う円弧状に形成されていることを特徴とする請求項1記載の永久磁石モータ。
- 永久磁石のステータコアと対応する側の長さ方向の両端部の角部は、切除されていることを特徴とする請求項1記載の永久磁石モータ。
- 永久磁石のステータコアと対応する側の長さ方向の両端部の角部は、切除されていることを特徴とする請求項2記載の永久磁石モータ。
- 請求項1ないし4のいずれかに記載の永久磁石モータにより洗濯機負荷を回転駆動するようにしたことを特徴とする洗濯機。
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KR1020147003446A KR101595673B1 (ko) | 2011-10-18 | 2012-10-02 | 영구자석 모터 및 세탁기 |
CN201280046508.4A CN103828194B (zh) | 2011-10-18 | 2012-10-02 | 永磁电机及洗衣机 |
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JP2011228828A JP2013090443A (ja) | 2011-10-18 | 2011-10-18 | 永久磁石モータおよび洗濯機 |
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KR (1) | KR101595673B1 (ja) |
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GB2522021A (en) * | 2014-01-08 | 2015-07-15 | Protean Electric Ltd | A rotor for an electric motor or generator |
EP3091644A1 (en) * | 2015-05-08 | 2016-11-09 | Johnson Electric S.A. | Washing machine and driving apparatus thereof |
CN108494132A (zh) * | 2018-06-01 | 2018-09-04 | 河北乾顺节能科技有限公司 | 内置式永磁体矿用隔爆永磁电动滚筒 |
EP4415229A1 (en) * | 2023-02-09 | 2024-08-14 | MAHLE International GmbH | Permanent magnet rotor and method for manufacturing the same |
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JP2015089224A (ja) * | 2013-10-30 | 2015-05-07 | 株式会社東芝 | モータ、洗濯機 |
JP6424078B2 (ja) * | 2014-02-13 | 2018-11-14 | 山洋電気株式会社 | ステータ、ステータの製造方法、およびモータ |
JP6494922B2 (ja) * | 2014-04-24 | 2019-04-03 | 東芝ライフスタイル株式会社 | モータ、ランドリー機器、及びモータの製造方法 |
CN104201852B (zh) * | 2014-09-11 | 2016-09-07 | 东南大学 | 绕组互补型转子永磁磁通切换电机 |
KR20200109739A (ko) | 2019-03-14 | 2020-09-23 | 삼성전자주식회사 | 모터 및 그를 가지는 세탁기 |
JP2021040405A (ja) * | 2019-09-02 | 2021-03-11 | 株式会社デンソー | 回転電機 |
US20230038713A1 (en) * | 2020-01-14 | 2023-02-09 | Ghsp, Inc. | Rotor assemblies |
CN111342633B (zh) * | 2020-04-07 | 2021-04-09 | 北京理工大学 | 一种高功率密度外转子结构的三相发电装置 |
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- 2012-10-02 CN CN201280046508.4A patent/CN103828194B/zh active Active
- 2012-10-02 WO PCT/JP2012/075520 patent/WO2013058100A1/ja active Application Filing
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JP2003332128A (ja) * | 2002-05-15 | 2003-11-21 | Toshiba Corp | 磁石製造用金型装置,磁石の製造方法,異方性磁石及び永久磁石モータ |
JP2011030314A (ja) * | 2009-07-23 | 2011-02-10 | Panasonic Corp | リング磁石、それを備えたモータおよび電気機器、並びにリング磁石の形成方法 |
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GB2522021A (en) * | 2014-01-08 | 2015-07-15 | Protean Electric Ltd | A rotor for an electric motor or generator |
GB2522021B (en) * | 2014-01-08 | 2018-02-07 | Protean Electric Ltd | A rotor for an electric motor or generator |
US10491067B2 (en) | 2014-01-08 | 2019-11-26 | Protean Electric Limited | Rotor for an electric motor or generator |
EP3091644A1 (en) * | 2015-05-08 | 2016-11-09 | Johnson Electric S.A. | Washing machine and driving apparatus thereof |
CN108494132A (zh) * | 2018-06-01 | 2018-09-04 | 河北乾顺节能科技有限公司 | 内置式永磁体矿用隔爆永磁电动滚筒 |
EP4415229A1 (en) * | 2023-02-09 | 2024-08-14 | MAHLE International GmbH | Permanent magnet rotor and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
CN103828194B (zh) | 2016-05-11 |
CN103828194A (zh) | 2014-05-28 |
KR20140041829A (ko) | 2014-04-04 |
KR101595673B1 (ko) | 2016-02-18 |
JP2013090443A (ja) | 2013-05-13 |
TW201334370A (zh) | 2013-08-16 |
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