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The Rotary Transformer Of CNC Machine Tool Factory

In the realm of CNC machine tools, the efficient transfer of electrical power is essential for optimal performance and precision.

The rotary transformer, a specialized component in CNC machine tool factories, plays a crucial role in providing reliable power supply to rotating components such as rotary tables, spindles, and tool changers.

This article aims to explore the significance of the rotary transformer, its working principles, applications, and the ways it contributes to the overall performance and precision in CNC machine tool operations.

Understanding the Rotary Transformer

The rotary transformer is an electromechanical device designed to transmit electrical power across a rotating interface. It is often used in CNC machine tools to ensure continuous and efficient power transfer to rotating components while maintaining electrical isolation between the stationary and rotating parts. The rotary transformer operates on the principles of electromagnetic induction, making it a versatile and reliable solution for power transmission in high-precision applications.

Working Principles of the Rotary Transformer

The rotary transformer consists of two main components: the primary side, which is stationary, and the secondary side, which rotates with the machine’s moving components. The primary side is connected to the power source, while the secondary side delivers power to the rotating elements.

  • Electromagnetic Induction: The rotary transformer works based on the principle of electromagnetic induction. When an alternating current (AC) flows through the primary winding, it generates a magnetic field around the winding. As the secondary winding is mounted on a rotating part, the changing magnetic field induces a voltage in the secondary winding, producing an alternating current in the rotating components.
  • Slip Rings and Brushes: To establish electrical contact between the stationary and rotating parts, slip rings and brushes are used. Slip rings are mounted on the rotating part and provide a continuous conductive surface, while brushes are in contact with the slip rings, ensuring electrical connectivity with the stationary part.

Applications of the Rotary Transformer in CNC Machine Tool Factory

The rotary transformer finds widespread applications in CNC machine tool factories, where its unique features and benefits are utilized to enhance the performance and precision of various components, such as:

  • 1. Rotary Tables: CNC machine tools often use rotary tables to achieve multi-axis machining. The rotary transformer provides a reliable power supply to the rotating table, enabling continuous rotation and accurate positioning during complex machining operations.
  • 2. Spindles: The spindle is a critical component in CNC machining, responsible for holding and rotating the cutting tool. The rotary transformer supplies power to the spindle motor, ensuring smooth and precise rotation for machining operations.
  • 3. Tool Changers: CNC machine tools with automatic tool changers require a reliable power supply to execute quick and seamless tool changes. The rotary transformer facilitates continuous power transfer to the tool changer, enabling efficient and precise tool handling.
  • 4. Indexing Heads: Indexing heads in CNC machine tools are used for accurate angular positioning. The rotary transformer ensures consistent power supply to the indexing head, ensuring precise indexing during machining processes.
  • 5. Turning and Milling Operations: In CNC turning and milling operations, the rotary transformer provides a stable power supply to the rotating components, allowing for smooth and uninterrupted machining processes.

Benefits of Using Rotary Transformers in CNC Machine Tool Factory

  • Precise Power Transfer: The rotary transformer ensures a stable and precise power supply to the rotating components, contributing to the overall accuracy and precision of CNC machining operations.
  • Electrical Isolation: By maintaining electrical isolation between the stationary and rotating parts, the rotary transformer prevents electrical interference and reduces the risk of electrical hazards in the CNC machine tool factory.
  • Seamless Rotation: The continuous and efficient power transfer facilitated by the rotary transformer allows for smooth and uninterrupted rotation of rotating components, ensuring consistent machining performance.
  • Improved Reliability: Rotary transformers are designed for high reliability, contributing to the overall uptime and productivity of CNC machine tools.
  • Reduced Maintenance: The use of rotary transformers minimizes wear and tear on electrical cables and connectors, reducing maintenance requirements and downtime.
  • Adaptability and Versatility: Rotary transformers can be customized to suit specific CNC machine tool requirements, making them adaptable to various applications and configurations.

The rotary transformer is a crucial component in CNC machine tool factories, enabling efficient and reliable power transfer to rotating components such as rotary tables, spindles, and tool changers. Its ability to maintain electrical isolation between stationary and rotating parts, combined with precise power transfer, ensures accurate and high-performance CNC machining operations. By utilizing rotary transformers, CNC machine tool factories can enhance precision, productivity, and overall machine performance, ultimately contributing to the success of precision manufacturing processes.

The rotary transformer of CNC machine tool factory is a common angular displacement measuring device on CNC machine tools. It has the characteristics of simple structure, sensitive action, reliable T operation, low requirements for environmental conditions, large amplitude of input H signal and strong anti-interference ability. Signal processing is more complicated, and resolvers are widely used in semi-closed-loop controlled CNC machine tools.

According to the functional relationship between output voltage and rotor angle, resolvers can be divided into the following j basic types:

  • Sine and cosine resolver. The excitation of single-phase AC power supply is applied externally on the primary side, and the two output voltages of =ik r are related to the sine and cosine functions of the rotor angle respectively.
  • Linear resolver. In a certain working angle range gate, the output voltage and the angle of rotation are linear functions.
  • Proportional resolver. It is similar to the sine and cosine resolver, with the addition of a device for adjusting and locking the rotor position in structure. In the system as a proportional component to adjust the voltage.

The Structure Of The Rotary Transformer In The CNC Machine Tool Factory

The rotary transformer of the CNC machine tool factory consists of two parts, the stator and the rotor, as shown in Figure 4-16. Two distributed windings whose axes are perpendicular to each other in space, that is, two-pole two-phase windings, are embedded in the fixed and rotated iron core slots, respectively. CNC Machine Tool Factory S, S. and S: S. They are identical in structure for the purpose of setting the windings. R, wind and R, R are rotor windings, and their structures are exactly the same. The stator winding is the primary side of the transformer, the rotor is the secondary side of the transformer, the excitation voltage is connected to the primary side, and the frequency is usually /iOOHz, oOOHz, 1000Hz and 5000Hz. The mutual inductance between the stator and rotor windings of the CNC machine tool factory changes according to the sine and cosine laws of the rotor deflection angle. One signal changes in proportion to the sine of the rotor angle, and the other signal changes in proportion to the cosine of the rotor angle. The stator winding lead wire Directly to the terminal block, while the rotor windings are connected to the terminal block through slip rings and brushes.

The two-pole resolver commonly used in CNC machine tool factories has a pair of magnetic poles for the stator and rotor. In addition to this, there is a multi-pole resolver.

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