Influence of temperature rising on the control accuracy of a magnetic suspended spindle

The temperature distribution of a magnetic suspended milling spindle was researched by means of an inferred heat picture camera. The temperature characteristic of system-used sensor was tested and analyzed. The influence on the control accuracy caused by sensors temperature drift with different sensor arrangements and sensing patterns was also studied. The principle of compensation on temperature drift of the eddy-current displacement sensor in controlling a magnetic suspended spindle system was illustrated as an example. The structural design of a magnetic suspended spindle has great influence on its temperature rising and its temperature distribution. The temperature distribution in a magnetic suspended spindle is uneven. The temperature variation is relatively great along the axes of the magnetic suspended spindle. No measuring error caused by temperature drift of the sensor can be eliminated neither by direct measuring nor differential measuring.