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Abstract: 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
60 kr/min with vibration amplitude less than 8 µm. 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.
Key words: Grinding Active magnetic bearing Eelectrospindle
CLC No: TH133.3
Received
20010814, received in revised form 20011220
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