主动磁轴承电主轴的磨削试验

通过现场磨削试验检验主动磁轴承电主轴的磨削性能。磁轴承控制器是以浮点DSP芯片TMS320C32为核心构建的数字控制系统。针对轴承套圈内圆磨削时主轴转子受力的特点确定了合适的控制器参数,使电主轴静态稳定悬浮并以60kr/min工作转速稳定运转,同频振幅小于8μm,轴承刚度达到22~58MN/m。现场磨削试验表明该磁悬浮电主轴的磨削精度已基本达到要求,精磨磨削效率接近工业应用水平。

GRINDING EXPERIMENT USING ELECTROSPINDLE LEVITATED WITH ACTIVE MAGNETIC BEARINGS

The performance of electrospindle levitated with active magnetic bearing is verified by actual grinding process. Using the floating point DSP(TMS320C32) as microprocessor, a digital control system for the electrospindle is developed. The mechanical feature of grinding force acted on the rotor of spindle is considered when the spindle is used to grind the internal surface of rolling bearing inner ring, the control parameters is determined according to the analysis above. The electrospindle is well suspended in a stable static state and rotate at 60kr/min with vibration amplitude less than 8 urn. Its stiffness can be up to 22~58 MN/m. The results from grinding process with the spindle mounted on a precision grinding machine show that the accuracy of finished surface of workpiece can fulfil the request quality of machining. The fine grinding efficiency approaches the standard for industrial applications.