ForHigh speed electric spindleThere are usually two methods for overall cooling: liquid cooling and forced air cooling.

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

(2) Air forced cooling refers to the design of a forced convection channel between the high-speed 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 and remove some of the heat from the motor inside the spindle.

According to different application scenarios, high-speed electric spindles can be roughly divided into eight categories: grinding, milling, turning, grinding, drilling, machining centers, mechanical spindles (excluding built-in motors), belt driven spindles, special rotation test spindles, etc. Users commonly use grinding, milling, turning, machining centers, mechanical spindles (excluding built-in motors), and belt driven spindles.

When choosing an electric spindle, be sure to pay attention to your application scenario, as the interface for different application scenarios is different. In addition, it is also crucial to understand your power requirements and the corresponding speed at this power, because for the same 1kW, the external dimensions of the electric spindle vary greatly between the 1000 rpm and 10000 rpm requirements, so the working conditions need to be accurate. Another reminder is that the interface of the tool must be clear, which is also a principle. In general, the interface speed of BT50 can only be used for electric spindles below 8000 revolutions per minute, while the interface of BT40 can be used for electric spindles below 18000 revolutions per minute. If higher speeds are required, the corresponding HSK or other high-speed tool interfaces should be selected for the tool interface. The ER spring chuck or SD spring chuck used on CNC milling electric spindles also have a certain allowable maximum speed.