Hinf Control of Milling AMB Spindle

This paper is concerned with the DSP-based H8 control of the actual milling AMB spindle rotor systems. The H8 control systems are designed for all five-axis-control of one axial direction and four radial directions. Then we tried some simulations comparing with conventional PID control. Next, we tried the experiments using DSPs of TMS320C30 and TMS32OC40 in cases of levitations and rotations. In experiments with parameter variations of increment of rotor mass, which is called robust performances, it has been clarified that the H8 control system is superior to conventional PID control system. We successfully ran up to about 35000 rpm with very small vibration and also safety. The control performances in high speed rotations, in particular, the envelop of amplitudes at sensor locations depending on rotational speed are almost the same as PID control.