초록 ▼

To provide magnetic bearing devices capable of preventing undesirable consequences caused by conical mode or parallel mode resonance which is liable to occur during acceleration of a rotor. A band-pass filter 24 is connected in series with a PID control circuit 12 is for improving stiffness in a spe

To provide magnetic bearing devices capable of preventing undesirable consequences caused by conical mode or parallel mode resonance which is liable to occur during acceleration of a rotor. A band-pass filter 24 is connected in series with a PID control circuit 12 is for improving stiffness in a specific frequency band. A displacement of a rotor 2 detected by a displacement detector 30 is entered to a switcher 32. On the other hand, a rotational speed sensor 7 detects the revolving speed, and a compensator switching discriminator 26 causes a switch 32s of the switcher 32 to connect to an output terminal 32b or to an output terminal 32c when the revolving speed coincides with preset revolving speed data. The preset revolving speed data defines specific revolving speeds occurring below and above a frequency band which includes a first conical mode resonant frequency and a second conical mode resonant frequency. The position of the rotor 2 is adjusted by a magnetic bearing 38 based on an output of the PID control circuit 12.

대표청구항 ▼

[ What is claimed is:] [1.] A magnetic bearing device comprising:a radial position sensor for measuring the position of a rotor in its radial direction;displacement arithmetical means for processing a displacement measured by the radial position sensor;first compensating means for improving stiffnes

[ What is claimed is:] [1.] A magnetic bearing device comprising:a radial position sensor for measuring the position of a rotor in its radial direction;displacement arithmetical means for processing a displacement measured by the radial position sensor;first compensating means for improving stiffness in a frequency band including at least a first conical mode resonant frequency and a second conical mode resonant frequency upon receiving an output of the displacement arithmetical means;second compensating means for correcting an output of the first compensating means;power amplification means for power-amplifying an output of the second compensating means; anda radial electromagnet for controlling the position of the rotor in its radial direction based on an output of the power amplification means.