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21. 发明授权

US5619083A Passive magnetic bearings for a spindle motor 失效
标题翻译：用于主轴电机的无源磁轴承
公开(公告)号：US5619083A
公开(公告)日：1997-04-08
申请号：US458570
申请日：1995-06-02
申请人： John C. Dunfield , Kamran Oveyssi , Gunter K. Heine
发明人： John C. Dunfield , Kamran Oveyssi , Gunter K. Heine
IPC分类号： F16C17/08 , F16C39/06 , G11B19/20 , H02K7/09 , H02K21/14
CPC分类号： F16C17/08 , F16C25/045 , F16C32/0417 , F16C32/0425 , F16C39/063 , G11B19/2009 , H02K7/09 , F16C2370/12
摘要： An apparatus for rotatably journaling a rotor of a spindle motor about a shaft comprising a plurality of annular ring multi-pole magnets, each ring comprised of a plurality of axially aligned magnets whose polarity is alternated along the radius of the ring. The annular ring multi-pole magnets are disposed on both the rotor and stator of a spindle motor in opposition in attraction mode, or a complete offset repulsion mode with like poles facing one another with an full offset, thereby forming a radially stable magnetic bearing for maintaining rotor displacement about a shaft in conjunction with a conventional axial pivot.
摘要翻译：一种用于将主轴电动机的转子围绕包括多个环形多极磁体的轴可旋转地旋转的装置，每个环由多个轴向对准的磁体组成，其极性沿着环的半径交替。环形多极磁铁在主轴电动机的转子和定子上以吸引模式相对设置，或者具有相同磁极彼此面对的全偏移斥力模式，从而形成径向稳定的磁轴承，结合传统的轴向枢轴保持绕轴的转子位移。

22. 发明授权

US5598048A Integrated passive magnetic bearing system and spindle magnet for use in an axial magnet spindle motor 失效
标题翻译：集成无源磁轴承系统和主轴磁铁，用于轴向磁铁主轴电机
公开(公告)号：US5598048A
公开(公告)日：1997-01-28
申请号：US289949
申请日：1994-08-12
申请人： John C. Dunfield , Kamran Oveyssi
发明人： John C. Dunfield , Kamran Oveyssi
IPC分类号： F16C17/08 , F16C39/06 , G11B19/20 , H02K5/167 , H02K7/09 , G11B17/02
CPC分类号： F16C17/08 , F16C25/045 , F16C32/0412 , F16C32/0425 , F16C39/063 , G11B19/2009 , H02K7/09 , F16C2370/12 , H02K5/167
摘要： An apparatus for rotatably journaling a rotor of a flat spindle motor about a stator comprising a spindle magnet disc disposed on the rotor assembly of the flat spindle motor and journaled about the spindle motor shaft having a disc shaped first magnetized region with an outer radius r comprised of a plurality of axial aligned poles, a disc shaped second region having an outer radius r2 (where r2>r) comprised of a single pole, and a disc shaped non-magnetized spacer region disposed there between. The integrated spindle magnet disc is disposed on the inside surface of a rotor over complementary axially aligned electromagnet poles which are disposed on the base of the stator assembly. A like aligned single pole is fixedly attached to the stator and disposed in opposition to the second magnetized region having like aligned pole of the integrated spindle permanent magnet. The single poles are disposed on both the rotor and stator in attraction mode with opposite poles facing one another, or in opposition mode with a complete or partial offset thereby forming a stable magnetic bearing for maintaining rotor displacement about the stator in conjunction with a conventional pivot. The stator base assembly is extended toward the first magnetized region to provide axial pre-load for the motor. The electromagnet poles further include a steel bobbin for increased flux density and added axial stiffness. Finally, eddy current generation means are disposed between the stator base and the like aligned single pole for improved dampening characteristics.
摘要翻译：一种用于将扁平主轴电动机的转子旋转地定位在定子上的装置，包括设置在扁平主轴电动机的转子组件上的主轴磁盘，并围绕具有外半径r的盘形第一磁化区域的主轴电机轴轴颈包围的多个轴向对准的极，具有由单个极组成的外半径r2（其中r2> r）的盘形第二区域和设置在其间的盘形非磁化间隔区域。集成主轴磁体盘设置在转子的内表面上，该互补的轴向对准的电磁体极设置在定子组件的基座上。类似的排列的单极固定地附接到定子并且与具有一体的主轴永久磁铁的相同排列的极的第二磁化区域相对设置。单极以吸引模式设置在转子和定子上，相反的磁极彼此面对，或以相反的方式设置有完全或部分偏移，从而形成稳定的磁轴承，用于与常规枢轴相结合，保持转子位于定子周围。定子基座组件朝向第一磁化区域延伸以为电动机提供轴向预加载。电磁极还包括用于提高磁通密度并增加轴向刚度的钢骨架。最后，涡流产生装置设置在定子基座和类似的对准的单极之间，以改善阻尼特性。

23. 发明授权

US5590003A Hydrodynamic spindle motor having distributed windings 失效
标题翻译：流体动力主轴电机具有分布绕组
公开(公告)号：US5590003A
公开(公告)日：1996-12-31
申请号：US400661
申请日：1995-03-08
申请人： John C. Dunfield , Gunter K. Heine
发明人： John C. Dunfield , Gunter K. Heine
IPC分类号： G11B17/022 , G11B25/04 , H02K3/28 , H02K5/16 , H02K29/00 , H02K29/03 , G11B17/02 , F16C32/06 , H02K3/00
CPC分类号： G11B17/022 , G11B25/043 , H02K7/14 , H02K29/03 , H02K3/28 , H02K5/16
摘要： A hydrodynamic bearing spindle motor for rotating at least one disc about a central axis in a data storage device comprises a base, a stationary member, a hub, and a stator. A hydrodynamic bearing interconnects the hub with the stationary member such that the hub is rotatable about the central axis. The stator is coaxial with the hub and has at least one stator winding that is distributed about its circumference. The distributed winding attenuates pure tone vibrations which become more noticeable with lower levels of background vibrations in hydrodynamic bearing spindle motors.
摘要翻译：用于在数据存储装置中围绕中心轴旋转至少一个盘的流体动力轴承主轴电机包括基座，固定构件，轮毂和定子。流体动力轴承将轮毂与固定构件互连，使得轮毂能够围绕中心轴线旋转。定子与轮毂同轴并且具有至少一个围绕其圆周分布的定子绕组。分布式绕组减弱了流体动力轴承主轴电机中具有较低水平的背景振动的更加明显的纯音振动。

24. 发明授权

US5587617A Integrated passive magnetic bearing system and spindle magnet for use in an axial magnet spindle motor 失效
标题翻译：集成无源磁轴承系统和主轴磁铁，用于轴向磁铁主轴电机
公开(公告)号：US5587617A
公开(公告)日：1996-12-24
申请号：US478271
申请日：1995-06-07
申请人： John C. Dunfield , Kamran Oveyssi
发明人： John C. Dunfield , Kamran Oveyssi
IPC分类号： F16C17/08 , F16C39/06 , G11B19/20 , H02K5/167 , H02K7/09
CPC分类号： F16C17/08 , F16C25/045 , F16C32/0412 , F16C32/0425 , F16C39/063 , G11B19/2009 , H02K7/09 , F16C2370/12 , H02K5/167
摘要： An apparatus for rotatably journaling a rotor of a flat spindle motor about a stator comprising a spindle magnet disc disposed on the rotor assembly of the flat spindle motor and journaled about the spindle motor shaft having a disc shaped first magnetized region with an outer radius r comprised of a plurality of axial aligned poles, a disc shaped second region having an outer radius r2 (where r2>r) comprised of a single pole, and a disc shaped non-magnetized spacer region disposed there between. The integrated spindle magnet disc is disposed on the inside surface of a rotor over complementary axially aligned electromagnet poles which are disposed on the base of the stator assembly. A like aligned single pole is fixedly attached to the stator and disposed in opposition to the second magnetized region having like aligned pole of the integrated spindle permanent magnet. The single poles are disposed on both the rotor and stator in attraction mode with opposite poles facing one another, or in opposition mode with a complete or partial offset thereby forming a stable magnetic beating for maintaining rotor displacement about the stator in conjunction with a conventional pivot. The stator base assembly is extended toward the first magnetized region to provide axial pre-load for the motor. The electromagnet poles further include a steel bobbin for increased flux density and added axial stiffness. Finally, eddy current generation means are disposed between the stator base and the like aligned single pole for improved dampening characteristics.
摘要翻译：一种用于将扁平主轴电动机的转子旋转地定位在定子上的装置，包括设置在扁平主轴电动机的转子组件上的主轴磁盘，并围绕具有外半径r的盘形第一磁化区域的主轴电机轴轴颈包围的多个轴向对准的极，具有由单个极组成的外半径r2（其中r2> r）的盘形第二区域和设置在其间的盘形非磁化间隔区域。集成主轴磁体盘设置在转子的内表面上，该互补的轴向对准的电磁体极设置在定子组件的基座上。类似的排列的单极固定地附接到定子并且与具有一体的主轴永久磁铁的相同排列的极的第二磁化区域相对设置。单极以吸引模式设置在转子和定子上，相反的磁极彼此面对，或以相反的方式设置有完全或部分的偏移，从而形成稳定的磁力跳动，以便与传统的枢轴。定子基座组件朝向第一磁化区域延伸以为电动机提供轴向预加载。电磁极还包括用于提高磁通密度并增加轴向刚度的钢骨架。最后，涡流产生装置设置在定子基座和类似的对准的单极之间，以改善阻尼特性。

25. 发明授权

US5579188A Ironless spindle motor for disc drive 失效
标题翻译：无铁主轴电机用于磁盘驱动器
公开(公告)号：US5579188A
公开(公告)日：1996-11-26
申请号：US469643
申请日：1995-06-06
申请人： John C. Dunfield , Gunter K. Heine , Kamran Oveyssi , Marcel Jufer
发明人： John C. Dunfield , Gunter K. Heine , Kamran Oveyssi , Marcel Jufer
IPC分类号： G11B19/20 , H02K3/04 , H02K3/28 , H02K5/16 , H02K5/173 , H02K7/08 , H02K15/04 , H02K21/12 , H02K21/14 , H02K21/22 , H02K29/00 , G11B17/04 , G11B17/08
CPC分类号： H02K21/22 , G11B19/2009 , H02K15/0478 , H02K21/12 , H02K21/14 , H02K5/163 , H02K7/085 , H02K7/086 , H02K3/04 , H02K3/28 , H02K5/173
摘要： An "ironless" bearing spindle motor for rotating at least one disc about a central axis in a data storage device comprises a housing, a stationary member, a hub, and a stator. A rotor magnet is attached to the hub. A bearing interconnects the hub with the stationary member such that the hub and rotor magnet are rotatable about the central axis. The stator is coaxial with the hub and includes an ironless stator winding. The ironless stator winding minimizes low-harmonic acoustic vibration peaks in the spindle motor, resulting in a spindle motor having a very quiet operation.
摘要翻译：用于在数据存储装置中围绕中心轴旋转至少一个盘的“无铁”轴承主轴电机包括壳体，固定构件，轮毂和定子。转子磁体连接到轮毂。轴承将轮毂与固定构件互连，使得轮毂和转子磁体可围绕中心轴线旋转。定子与轮毂同轴并且包括无铁定子绕组。无铁定子绕组使主轴电机中的低谐波声振峰值最小化，导致主轴电机具有非常安静的操作。

26. 发明授权

US5254914A Position detection for a brushless DC motor without Hall effect devices using a mutual inductance detection method 失效
标题翻译：无刷直流电机的位置检测，无霍尔效应器件采用互感检测方式
公开(公告)号：US5254914A
公开(公告)日：1993-10-19
申请号：US546236
申请日：1990-06-29
申请人： John C. Dunfield , Gunter K. Heine
发明人： John C. Dunfield , Gunter K. Heine
IPC分类号： H02P6/18 , H02P6/22 , H02K29/00
CPC分类号： H02P6/22 , H02P6/185
摘要： The present method and apparatus detects the rotor position of a brushless DC motor with an accuracy of .pi./m electrical radians (where m = the number of motor phases) within one electrical period, and provides enough information to enable starting the motor in the correct direction with certainty. After starting the motor in an open loop mode of one or two steps, a closed loop mode may be switched on, using a dynamic indirect position detection as is already well known in the technology. More specifically, the position at start is determined by the injection of short current pulses in different motor phases, each phase or pair of phases being energized first by a pulse of one polarity and of the opposite polarity. The sign of the time difference between the decay times of the induced voltages in the un-energized phase is detected. By performing a succession of these tests on different phases or pairs of phases of the standing motor, a table of results is established which clearly defines the position of the rotor relative to the motor phases. The same table then defines what polarity currents should be applied to each phase to reliably and certainly start the motor in the proper direction.
摘要翻译：本方法和装置在一个电周期内以pi / m电弧度（其中m =电动机相位数）的精度检测无刷直流电动机的转子位置，并提供足够的信息，以使电动机起动正确方向确定。在以一个或两个步骤的开环模式启动电动机之后，可以使用如本技术中已知的动态间接位置检测来接通闭环模式。更具体地说，启动时的位置是通过在不同的电动机相中的短电流脉冲的注入来确定的，每一相或一对相首先由一个极性的脉冲和相反的极性激发。检测未通电阶段的感应电压的衰减时间之间的时间差的符号。通过对立式电动机的不同相或相对相继进行这些测试，建立了一个结果表，其中明确了转子相对于电动机相的位置。那么同一个表然后定义了什么极性电流应该施加到每个相位可靠地和肯定地启动电机在正确的方向。

27. 发明授权

US06803561B2 Frequency tunable resonant scanner 有权
标题翻译：频率可调共振扫描仪
公开(公告)号：US06803561B2
公开(公告)日：2004-10-12
申请号：US10318457
申请日：2002-12-13
申请人： John C. Dunfield
发明人： John C. Dunfield
IPC分类号： H01J314
CPC分类号： G02B26/101 , B81C1/00293 , G02B26/0833 , G02B26/0841 , G02B26/085 , G02B26/0858 , G02B26/105 , G02B27/017 , G02B27/0176
摘要： A display apparatus includes a scanning assembly that scans about two or more axes, typically in a raster pattern. A plurality of light sources emit light from spaced apart locations toward the scanning assembly such that the scanning assembly simultaneously scans more than one of the beams. The scanning assembly is a resonant scanning assembly with a variable resonant frequency. The resonant frequency of the scanning assembly can be actively controlled by controlling partial pressure of fluids in a package containing the scanning assembly. In one embodiment, the increased partial pressure increases the mass of a scanning mirror, thereby changing the resonant frequency. In another embodiment, a gas absorbing material is coupled to a support arm that carries a scanning mirror. As the gas absorbing material absorbs gas, its physical properties change, thereby shifting the resonant frequency of the scanning assembly. Monitoring the resonant frequency relative to a desired frequency provides in error signal that can be used to frequency lock the resonant scanning assembly to an input signal.
摘要翻译：显示装置包括扫描组件，扫描组件通常以光栅图案扫描两个或多个轴。多个光源从间隔开的位置向扫描组件发射光，使得扫描组件同时扫描多于一个的光束。扫描组件是具有可变谐振频率的谐振扫描组件。可以通过控制包含扫描组件的包装中的流体的分压来主动地控制扫描组件的共振频率。在一个实施例中，增加的分压增加了扫描镜的质量，从而改变了谐振频率。在另一个实施例中，气体吸收材料连接到承载扫描反射镜的支撑臂。当气体吸收材料吸收气体时，其物理性质改变，从而移动扫描组件的共振频率。监测相对于期望频率的谐振频率提供了可用于将谐振扫描组件频率锁定到输入信号的误差信号。

28. 发明授权

US06331909B1 Frequency tunable resonant scanner 有权
标题翻译：频率可调共振扫描仪
公开(公告)号：US06331909B1
公开(公告)日：2001-12-18
申请号：US09370791
申请日：1999-08-05
申请人： John C. Dunfield
发明人： John C. Dunfield
IPC分类号： G02B2608
CPC分类号： G02B27/0176 , G02B26/0841 , G02B26/085 , G02B26/0858 , G02B26/101 , G02B26/105 , G02B27/017
摘要： A display apparatus includes a scanning assembly that scans about two or more axes, typically in a raster pattern. A plurality of light sources emit light from spaced apart locations toward the scanning assembly such that the scanning assembly simultaneously scans more than one of the beams. The scanning assembly is a resonant scanning assembly with a variable resonant frequency. The resonant frequency of the scanning assembly can be actively controlled by controlling partial pressure of fluids in a package containing the scanning assembly. In one embodiment, the increased partial pressure increases the mass of a scanning mirror, thereby changing the resonant frequency. In another embodiment, a gas absorbing material is coupled to a support arm that carries a scanning mirror. As the gas absorbing material absorbs gas, its physical properties change, thereby shifting the resonant frequency of the scanning assembly. Monitoring the resonant frequency relative to a desired frequency provides in error signal that can be used to frequency lock the resonant scanning assembly to an input signal.
摘要翻译：显示装置包括扫描组件，扫描组件通常以光栅图案扫描两个或多个轴。多个光源从间隔开的位置向扫描组件发射光，使得扫描组件同时扫描多于一个的光束。扫描组件是具有可变谐振频率的谐振扫描组件。可以通过控制包含扫描组件的包装中的流体的分压来主动地控制扫描组件的共振频率。在一个实施例中，增加的分压增加了扫描镜的质量，从而改变了谐振频率。在另一个实施例中，气体吸收材料连接到承载扫描反射镜的支撑臂。当气体吸收材料吸收气体时，其物理性质改变，从而移动扫描组件的共振频率。监测相对于期望频率的谐振频率提供了可用于将谐振扫描组件频率锁定到输入信号的误差信号。

29. 发明授权

US5841252A Detection of starting motor position in a brushless DC motor 失效
公开(公告)号：US5841252A
公开(公告)日：1998-11-24
申请号：US414312
申请日：1995-03-31
申请人： John C. Dunfield
发明人： John C. Dunfield
IPC分类号： H02P6/18 , H02P6/22 , H02P7/00
CPC分类号： H02P6/22 , H02P6/185
摘要： A microprocessor-controlled-circuit applies pulses to a standing motor whose rotor position is to be determined. The time required for the injected current to reach a predetermined threshold in a comparator is measured. The pulses are long enough to effectuate an accurate measurement, but not so long that the rotor moves. The pulse is applied twice to each phase, once with a positive polarity and once with a negative polarity, for a total of six measurements. The positive and negative rise times are subtracted from each other to determine whether the positive or negative current rise time was greater. Based upon the differences in the readings for all of the phases, the position of the rotor is known. There are differences in which the difference is zero or negligible. There are at least two methods to determine rotor position when there are ambiguities in the sign of the difference. In one method, the combination of the sign of the rise time difference or its absence plus the magnitude of the rise time can be used along with look-up tables to determine the rotor position. Another method is to resolve a position uncertainty by changing the effective rotor position. This is done by pulsing all three phases actively. Instead of leaving a phase open during pulsing, the third phase is tied high or is tied low. Once start-up ambiguities are resolved, control of acceleration from stand-still through medium speed to constant, nominal speed is provided.

30. 发明授权

US5698911A Low leakage actuator for high performance 失效
标题翻译：低泄漏执行器，用于高性能
公开(公告)号：US5698911A
公开(公告)日：1997-12-16
申请号：US443432
申请日：1995-05-17
申请人： John C. Dunfield , Kamran Oveyssi
发明人： John C. Dunfield , Kamran Oveyssi
IPC分类号： G11B5/55 , G11B7/085 , G11B11/105 , G11B21/08 , H02K41/035 , H02K41/02 , G11B33/00
CPC分类号： H02K41/0358 , G11B21/08 , G11B5/5521 , G11B11/10569 , G11B7/08576
摘要： An actuator, suited for rapidly and precisely locating the head of a disc drive, reduces variations in flux density and reluctance torque across the entire effective stroke width of the actuator. The actuator, cooperating with a voice coil motor, includes a central yoke, upper and lower yokes aligned above and below the central yoke, and side yokes all formed of magnetic permeable material, a coil movable over the central yoke, and magnets supported from the upper and lower yokes and aligned with the stroke width of the coil. The upper and lower yoke pieces are profiled to have an increased radius in the region near the ends of these yokes and near the end of the coil stroke arc. This maximizes the flux density passing through these yokes so that the flux density and torque applied to the actuator is made linear. The simple structure improves performance without any substantial increase in the design envelope and operates at high efficiency. Alternative configurations provide for portions of the central pole piece beyond the end of the stroke of the coil to become gradually wider or thicker so that the flux flow around the corners where the central pole piece meets the side pieces of the yoke does not saturate and reduce torque at the actuator, and a variation where the magnets are shaped in the vertical axis perpendicular to the plane of motion of the coil in order to promote the flux passage or distribution through the yoke.
摘要翻译：适用于快速且精确地定位磁盘驱动器磁头的执行机构可以减小驱动器整个有效行程宽度上磁通密度和磁阻转矩的变化。与音圈电动机配合的致动器包括中心轭，中心轭上方和下方配置的上轭和下轭，以及可由磁性可渗透材料形成的侧轭，可在中心轭上移动的线圈，上下轭，并与线圈的行程宽度对齐。上轭铁片和下轭铁片在这些轭的端部附近的区域附近具有增加的半径，并且在线圈行程弧的末端附近。这使通过这些磁轭的通量密度最大化，使得施加到致动器的磁通密度和扭矩成线性。简单的结构提高了性能，而没有设计范围的任何实质性增加并且以高效率运行。替代配置提供了超过线圈行程末端的中心极片的部分逐渐变宽或变厚，使得中心极片与轭的侧片相交的拐角周围的磁通流不会饱和并减少致动器处的扭矩以及垂直于线圈运动平面的垂直轴成形磁铁的变化，以促进通过磁轭的磁通通过或分配。

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