| 摘要 |
PURPOSE:To improve the control performance by applying sq. rt. -system into a three-coil type attraction control radial magnetic bearing apparatus, in said bearing apparatus in which three attracting electromagnets are arranged in the circumferential direction. CONSTITUTION:Each electric-current instruction Ias, Ibs, Ics of the coils is calculated by sq. rt. -function devices 7-9. When deltao is the amount of the gap between each magnetic pole in the case where the axis is at the center, the gap of each electrode surface is represented by the following equations: deltaa=deltao-deltay, deltab= deltao+ (1/2)deltay-(3<1/2>/2)deltax, deltac=deltao+(1/2)deltay+(3<1/2>/2)deltax, in other words, from the displacement signals deltax and deltay in the x and y directions, the correction signals Fxs and Fys which reduce the displacement signals to zero are generated by a PID phase control circuits 1 and 2. The correction ignal is analyzed in the direction of each coil, and at the same time, sq. rt. -calculation is performed by adding a bias signal Io, and the electric-current instruction signal Ias, Ibs, Ics of each coil is obtained by multiplying by the gaps signal deltaa, deltab, and deltac, respectively. |
