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    • 2. 发明授权
    • Reduced noise electric motor for disk drive data storage devices
    • 减速电机用于磁盘驱动器数据存储设备
    • US06501242B1
    • 2002-12-31
    • US09783362
    • 2001-02-14
    • Kevin Jack EricksonZine-Eddine Boutaghou
    • Kevin Jack EricksonZine-Eddine Boutaghou
    • G05B1101
    • G11B19/28
    • An electric motor, which is preferably a disk drive spindle motor, contains a multi-phase stator driven by switching the phases of drive current at corresponding commutation angles of the rotor. Small semi-random offsets are introduced into the commutation angles at which the drive current is switched, spreading the frequency of excitation over a wider range, and reducing the peak harmonic excitation at the switching frequency. Preferably, a table of offsets is maintained, and an offset from the table is added to each commutation point. The table preferably has more entries than the number of commutation points, the entries being cycled on a round-robin or other basis.
    • 优选为盘驱动主轴电动机的电动机包含通过在转子的相应换向角切换驱动电流的相位而驱动的多相定子。 将小的半随机偏移引入到驱动电流切换的换向角度,在更宽的范围内扩展激励频率,并降低开关频率下的峰值谐波激励。 优选地,保持偏移表,并且将与表的偏移量相加到每个换向点。 该表优选地具有比转换点数更多的条目,条目以循环或其他方式循环。
    • 3. 发明授权
    • Disk drive spindle motor having split windings for each phase
    • 磁盘驱动主轴电机具有每相的分离绕组
    • US5670837A
    • 1997-09-23
    • US445510
    • 1995-05-22
    • Zine-Eddine BoutaghouKevin Jack Erickson
    • Zine-Eddine BoutaghouKevin Jack Erickson
    • G11B19/20G11B25/04H02K1/27H02K3/28H02K16/00H02K21/22H02K29/03H02K1/00H02K3/00
    • G11B25/043G11B19/2009H02K16/00H02K21/22H02K29/03H02K1/2786H02K3/28
    • A reduced size brushless DC motor preferably for use as a disk drive spindle motor includes a rotor having two sets of permanent magnets, and a stator having separate portions corresponding to the two sets. An upper set of permanent magnets and the corresponding portion of the stator are located within the upper portion of the hub, which fits within the holes of the disks of a disk drive. A lower set of permanent magnets and corresponding portion of stator are located in the flange of the motor hub which supports the disks from below. In one embodiment, the stator core has an L-shaped cross-sectional area in the plane of the motor axis, one leg of the L driving the upper set of magnets in the rotor and the other leg driving the flange magnets. In a second embodiment, the stator core includes two separate pieces, one corresponding to each set of permanent magnets. In either embodiment, the separate coils or coil portions may be electrically connected in series or in parallel, or may be connected to switches enabling them to be driven in series or parallel selectively. Furthermore, the phases of the two sets of permanent magnets may be staggered to reduce the effects of transition from one magnetic pole to the next. Where the stator core includes two separate pieces, it is also possible to stagger the stator phases as well, reducing torque pulsations and wire interference.
    • 优选用作盘驱动主轴电动机的减小尺寸的无刷直流电动机包括具有两组永磁体的转子和具有对应于两组的分离部分的定子。 一组永磁体和定子的相应部分位于毂的上部内,其装配在盘驱动器的盘的孔内。 一组永磁体和定子的相应部分位于从下方支撑磁盘的电动机集线器的凸缘中。 在一个实施例中,定子铁芯在电动机轴线的平面中具有L形横截面积,L的一条腿驱动转子中的上部磁体组,而另一条腿驱动凸缘磁体。 在第二实施例中,定子铁芯包括两个单独的片,一个对应于每组永磁体。 在任一实施例中,单独的线圈或线圈部分可以串联或并联电连接,或者可以连接到开关,使得它们能够被选择性地串联或并联驱动。 此外,两组永磁体的相位可以交错以减少从一个磁极向下一个磁极的转变的影响。 定子铁心包括两个独立的部件,也可以使定子相交错,降低转矩脉动和电线干扰。