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Heat generation is inevitable in motorized spindle. A large amount of heat is generated in the spindle under the combined effects of internal and external heat sources.

Motion control is the core of motorized spindle control system. The variable-voltage variable-frequency speed regulation system of motorized spindle is often called variable-frequency speed regulation system. Since slip power does not change with rotational speed during speed regulation, the speed range is wide and the working efficiency is high at both high and low speeds.

High-speed machining technology can solve many difficulties in manufacturing of mechanical products, such as obtaining special machining accuracy and surface quality.

Motorized spindle is a key functional component of machine tool. Its reliability and accuracy directly affect the operational reliability and machining accuracy of the entire CNC machine tool, and are even directly related to the production efficiency of the entire production line. The fault analysis of motorized spindle belongs to the category of reliability physics, and is the study of the fault phenomenon, mechanism, mode and hazard of motorized spindle. It is a necessary measure to realize the reliability growth of motorized spindle, and is a basic work ensuring the reliability of motorized spindle. The fault diagnosis of motorized spindle can provide a basis for subsequent reliability model establishment, reliability analysis and reliability design.

Modern high-speed CNC machining center features high rotational speed of spindle, high operational precision and high machining efficiency. The improvement of speed and precision is based on high-precision dynamic balance.

Problems such as non linearity, parametric changes, disturbance and noise exist in the drive system of high-performance motorized spindle. The solution of these problems is the key to improving the control precision and control performance of motorized spind drive system.

Dynamic imbalance and vibration of high-speed spindle are important factors affecting machining accuracy.

In addition to the requirements for the high speed and high power of motorized spindle, high-speed machining also requires the ability of spindle to control its own temperature rise and thermal deformation.

The spindle system of ordinary CNC lathe is a complex structure which could cause additional static, dynamic and heat loads during machining. In this study, a novel spindle system with shorten transmission link is used to reduce power consumption and improve machining performance. A series of models have been established for the spindle improvement, such as bearing forces, bending moment, and deflection of spindle. A comparison analysis on the machining characteristic of lathe with the two spindle systems is investigated. Improvements are presented mainly on machining efficiency and cutting capability. Finally, the improved shorten spindle system could substitute the ordinary spindle system for its high cutting efficiency and low cost.