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    • 10. 发明授权
    • Magnetic bearing device and magnetic bearing spindle device
    • 磁轴承装置及磁轴承主轴装置
    • US07576463B2
    • 2009-08-18
    • US12078727
    • 2008-04-03
    • Atsushi Kubo
    • Atsushi Kubo
    • H02K7/09F16C39/06
    • F16C32/0444B23Q1/70F16C2322/39
    • A control device includes a differential amplifying circuit for obtaining a difference between values of exciting currents (exciting voltage values) supplied to a pair of axial electromagnets and a pair of radial electromagnets, multiplying the obtained difference by coefficient times, and outputting it as the bearing load in an axial direction and a radial direction. The exciting current includes steady current supplied to the axial electromagnets and the radial electromagnets and control current which varies by the displacement of a main shaft. By supplying the steady current to the axial electromagnets and the radial electromagnets, the magnetic attraction force of the axial electromagnets and the radial electromagnets having non-linearity is linearly approximated. Accordingly, the difference between the values of the exciting currents (exciting voltages) supplied to a pair of electromagnets is obtained and is multiplied by coefficient times, thereby obtaining a value corresponding to the bearing load.
    • 控制装置包括差分放大电路,用于获得供给一对轴向电磁体的励磁电流值(激励电压值)和一对放射状电磁体之间的差值,将获得的差值乘以系数乘以,并输出为轴承 沿轴向和径向负载。 励磁电流包括提供给轴向电磁体和径向电磁体的稳定电流以及由主轴的位移而变化的控制电流。 通过向轴向电磁体和径向电磁体供给稳定电流,轴向电磁体和具有非线性的径向电磁体的磁吸引力被线性近似。 因此,获得供给一对电磁体的励磁电流(励磁电压)的值之差,乘以系数乘以得到与轴承负荷对应的值。