Application of servo motor in continuous casting

We have introduced the application and system core of servo motors before. It can be seen that the servo motor system can be divided into two parts: servo driver and motor. Small AC servo generally uses permanent magnet synchronous motor as the power source, and there are also motors that use DC motor as the power source, but they are ly used at present.

So far, al all micro DC motor products are designed and manufactured for specific purposes. It is impossible to try to produce a universal series of brushless motors to adapt to ever-changing market demands. Companies design and manufacture servo motors with various special structures and specific uses, and are constantly innovating in new technologies in design, structure and process to adapt to the needs of different machine markets. So what are the applications of servo motors in continuous casting? Let’s find out together below!

1. Products develop towards specialization and diversification

Whether it is a servo motor using ferrite permanent magnets or earth permanent magnets, the common permanent magnet rotor structure is surface-mounted (SPM). In recent years, well-known Japanese home appliance manufacturers have adopted their own patented rotor structures in the servo motors of their new generation inverter air conditioner compressors. The embedded permanent magnet (IPM) rotor structure has become mainstream. The motor with IPM rotor structure can achieve higher efficiency to enhance the rotor's ability to resist high-speed centrifugal force.

2. Through structural and process innovation, production automation and scale, the products will be developed in the direction of low cost and low price.

Because the cost of electronic commutation circuits is higher than that of mechanical commutators, the cost and selling price of servo motors are gradually increasing. The price of servo motors is the main factor that limits the expansion of their applications into civilian products. In view of the increasing demand for low-cost motors in the domestic and foreign automobile industry, home appliance industry, and office automation fields, the new servo motor developed aims to provide a servo motor with a simple structure, easy production, reliable performance, convenient control, and low cost. Low-cost DC motors are suitable for industrial control, especially in the field of various civilian products.

3. Brief description of continuous casting servo drive system

The motion curve of continuous casting billet is an analog waveform that is similar to a sine wave. It is controlled by a microcontroller program, and the frequency and speed of billet casting are adjusted through keyboard input and monitor monitoring. Its operation is simple and quick. The servo controller drives the motor by receiving the switching control signal and the analog speed given signal of the microcontroller. The microcontroller detects the movement trajectory of the motor rotor in real time through the position feedback signal, thereby realizing the position closed loop of the control system to ensure that the movement trajectory of the servo motor meets the requirements of the process.

4. Technical requirements for the driving system of the billet drawing process

According to the control requirements of the blank casting process, the speed given signal (an analog quantity similar to a sinusoidal waveform) is output by the microcontroller and sent to the servo controller through a shielded communication cable to drive the servo motor to achieve reciprocating variable speed motion. The actual running trajectory waveform of the motor The given signal curve must be followed quickly, synchronously and accurately in order to complete the billet casting process completely.