Electric spindleThere are various classifications, and the ones we often see are mainly distinguished by motor type and bearing type. Next, let's introduce the classification of electric spindles in detail.

Electric spindles can be divided into asynchronous electric spindles and synchronous electric spindles according to the type of electric motor. At present, most high-speed electric spindle products are equipped with built-in asynchronous AC induction motors, while synchronous electric spindles often use permanent magnet synchronous motors.

The structure of asynchronous electric spindle is relatively simple, the manufacturing process technology is relatively mature, the installation is convenient, and it can achieve constant torque and constant power adjustment. Permanent magnet synchronous motors have advantages such as high torque density, low moment of inertia, better dynamic response characteristics, low noise, small size, and long service life. At startup, the current changes less when the load changes, resulting in higher power density and efficiency.

Electric spindles can be divided into rolling bearings, air dynamic and static pressure bearings, liquid dynamic and static pressure bearings, and magnetic levitation bearings based on the type of bearings used. Among them, rolling bearings, air dynamic and static pressure bearings, and liquid dynamic and static pressure bearings are currently the most widely used types of bearings in electric spindles.

1. Rolling bearing electric spindle is an electric spindle supported by precision rolling bearings. According to different lubrication methods, rolling bearings can be divided into the following types for electric spindles: grease electric spindles use high-speed lubricating grease for bearing lubrication methods for electric spindles. The oil mist electric spindle uses a bearing lubrication method with a continuous supply of atomized mixture of compressed air and lubricating oil. Oil gas electric spindle is an electric spindle that uses compressed air to continuously supply a small amount of lubricating oil to the bearings for lubrication.

2. Gas bearing electric spindle is an electric spindle supported by air dynamic and static pressure bearings.

3. Liquid bearing electric spindle is an electric spindle supported by liquid dynamic and static pressure bearings.