When the synchronous electric spindle is working, the built-in motor and rolling bearings will generate a large amount of heat during the rotation process. Due to the compact structure and small gap of the synchronous electric spindle, the spontaneous heat dissipation effect is weak. If the heat is not dissipated in time, it will cause varying degrees of thermal expansion between the internal parts of the electric spindle, affecting the performance parameters such as stiffness and machining accuracy of the synchronous electric spindle, and even seriously affecting the service life of the spindle. We will introduce two cooling methods for this.

For the overall cooling of electric spindles, there are usually two methods: liquid cooling and forced cooling.

(1) Liquid cooling refers to the design of circulating cooling water inside the electric spindle, equipped with corresponding cooling machines externally, to circulate the cooling liquid inside the synchronous spindle and remove internal heat. The advantage of this cooling method is that it is designed to be simple and reliable, with a significant cooling effect. The disadvantage is that the cooling effect on the spindle core is poor, and the cost of the cooler is relatively high.

(2) Air forced cooling refers to the design of a channel for forced convection between the electric spindle housing and the motor stator. The heat generated by the motor enters the forced convection zone through thermal conduction, and finally brings the heat into the air, achieving constant temperature operation of the electric spindle. Air forced cooling has the characteristic of no pollution. If a static pressure gas bearing is used, the gas in the static pressure gas bearing can be used to circulate inside the spindle, taking away some of the heat from the motor.

It is necessary to cool and dissipate heat from the synchronous electric spindle, especially in high temperature weather. If the electric spindle overheats during use, it is necessary to consider whether to take heat dissipation measures. Do not let the electric spindle run in an overheated state, which will affect its service life.