Shanghai imported motorized spindle maintenance manufacturer believes that because the motorized spindle integrates the motor in the spindle unit and runs at very high speed, a large amount of heat is generated during operation, causing temperature rise of the spindle, deteriorating its thermal and dynamic characteristics, and thus affecting its normal work. Therefore, certain measures must be taken to control the spindle temperature so that it remains constant at a certain value. Machine tools generally use forced circulating oil cooling to cool the spindle stator and spindle bearings, that is, the cooling oil from the oil cooling device is forcibly circulated outside the spindle stator and bearings, carrying away the heat generated by high-speed rotation. In addition, to reduce the heat generation of spindle bearings, the spindle bearings must be lubricated rationally.

The motor of the motorized spindle is an AC asynchronous induction motor. Because it is used on high-speed machine tools, it must rise quickly from standstill to tens of thousands or even hundreds of thousands of revolutions per minute at startup. The starting torque is large, so the starting current is 5-7 times higher than the rated current of ordinary motors. There are two drive modes: inverter drive and vector-control drive. The inverter drive is characterized by constant-torque driving, with output power proportional to torque. New machine tool inverters adopt advanced transistor technology and can achieve infinitely variable spindle speed. The vector-control drive of machine tools is constant-torque drive at the low-speed end and constant-power drive at the medium/high-speed end.

The motorized spindle has the advantages of compact structure, light weight, small inertia, low noise and fast response. Moreover, because of its high speed and large power, it is an ideal structure among high-speed spindle units, simplifying machine design and making spindle positioning easy. Motorized spindle bearings adopt high-speed bearing technology, are wear-resistant and heat-resistant, and their service life is several times that of traditional bearings.

Grinding motorized spindles are mainly used in surface grinding machines to improve grinding line speed and surface quality. They have the following characteristics: mainly constant-torque motorized spindles; high speed, high precision and high output power; high sealing performance. In the early days, the bearing industry used them to grind the inner surfaces of bearing rings; now they are widely used in various internal and external cylindrical grinding machines.

The manufacturer believes the motorized spindle of a CNC lathe is the workpiece spindle of the machine. It has the following characteristics: high-speed, high-precision rotation and low-speed high torque; the front and rear ends of the spindle can be equipped with corresponding power chucks or rotary hydraulic cylinders to realize automatic loosening and clamping of workpieces; constant-speed performance to suit thread turning.

The drilling motorized spindle is a special machine spindle used for drilling, including the spindle for high-speed drilling of printed circuit boards. It has the following characteristics: high axial rigidity; high speed and high precision; aerostatic bearings are usually used for PCB drilling spindles.