High speed electric spindleThe application range of high-speed electric spindles is very wide, but there are many problems in practical use, and the thermal stability of high-speed electric spindles is one of the key issues that needs to be solved. Why do thermal stability issues arise? How to solve it?

Due to the integration of the motor into the structure of the high-speed electric spindle assembly, a heat source is undoubtedly added to the structure. The heating of a motor mainly includes copper loss heating of the stator winding and iron loss heating of the rotor. In addition, the high-speed agitation of the motor rotor in the spindle box heats up the air inside the cavity. The heat generated by these heat sources is mainly dissipated through the spindle box and spindle. Therefore, a portion of the heat generated by the motor will be transferred to the bearings through the spindle, thereby affecting the service life of the bearings and causing thermal elongation of the spindle.

In addition, the heat dissipation and conduction of the spindle motor require reasonable lubrication and cooling of the spindle bearings, otherwise the high-speed operation of the high-speed electric spindle cannot be guaranteed. To improve thermal characteristics, motor cooling is essential. When the motor is working, circulating cooling water is introduced into the water tank. To improve the cooling effect, the inlet temperature of the cooling water should be strictly controlled, and there should be a certain pressure and flow rate. In order to prevent the motor from overheating and affecting the spindle bearings, the spindle should be made of materials with high thermal resistance, so that the heat of the motor rotor is mainly transmitted to the stator through the air gap and absorbed by the cooling water, thereby maintaining the thermal stability and balance of the high-speed electric spindle.