I. Structural composition
The electric spindle is a new technology that combines the machine tool spindle and the spindle
motor in the field of CNC machine tools in recent years. The main drive system of high-speed CNC machine tools eliminates the belt drive and gear drive. The main shaft of the machine
tool is directly driven by the built-in motor, which shortens the length of the main drive chain of the machine tool to zero and realizes
the "zero drive" of the machine tool. This type of transmission structure intergrating spindle
motor and machine tool spindle, which makes the spindle components relatively independent from the drive system and overall structure of machine tool, so it can be made into a "spindle unit", commonly known as electric spindle or Motor Spindle.
The electric spindle is a set of components, which includes the electric spindle itself and its
accessories: electric spindle, frequency conversion device, oil mist lubricator, cooling device, built-in encoder, tool changer, etc. The rotor of the motor is directly used as the main shaft of the machine
tool, and the housing of the main shaft unit is the motor base, and other parts are integrated to realize the integration of the motor and the main shaft of the machine tool.
The electric motor of the electric spindle adopts AC asynchronous induction motor. It is used on
high-speed processing machine tools, so it needs to rise rapidly from static to tens of thousands of revolutions per minute or even hundreds of thousands of revolutions at startup. The starting torque is large, so the starting current must exceed the rated current of the ordinary motor by
5 to 7 times.. There are two types of drive methods: inverter drive and vector control drive.
III. Application of high-speed electric spindle in machine tool industry
1. Simplify structure and promote modular machine tool structure
The electric spindle can form standardized and serialized products according to the characteristics of use, structure, and performance parameters for the host to choose, thereby promoting the
modularization of the machine tool structure.
2. Reduce machine tool costs and shorten machine tool development cycles. Standardized and serialized electric spindle products are easy to form professional and large-scale production, and can shorten the development cycle of machine tools, adapting to the current fast-changing market trend.
3. Improve machine performance and reliability.The CNC machine tool adopting the
electric spindle structure has improved the reliability of the machine tool due to the
simplified structure and the reduction of transmission and connection links; the electric
spindle components with the mature technology, complete functions, excellent performance and reliable quality make the machine tool more reliable.
4. Realize the special requirements of some high-end CNC machine tools.Some high-end CNC machine tools, such as parallel kinematic machine tools, pentahedron machining centers, small hole and ultra-small hole processing machine tools, must use electric spindles in order to meet the
complete functional requirements. The electric spindle system is directly driven by the
built-in motor to meet the high-speed cutting’s requirements of “high speed, high precision, high reliability and small
vibration” on the machine tool. The combination of electric spindle technology and motor frequency conversion, closed-loop vector control, and AC servo control technology can meet the needs of metal cutting processing such as turning, milling, boring, drilling, and grinding.
In September 1958, the spindle manufacturing department successfully developed China's first high-precision electric spindle. The electric spindle uses the speed of 30,000 ~ 60,000r / min for precision bearing grinding.
Through the efforts of several generations of spindle employees, ZYS has established its leading
position in the field of high frequency Spindle spindle in China, and its research and development
strength and spindles varieties rank first in China.
For more detailes of electrical spindle, please contact Mr. ZHANG by email@example.com or visit www.zys-bearing.com.