The control system of linear motors mainly consists of test line tracks, linear motors, DC power supply systems, and central control rooms. These parts work together to ensure that linear motors can move accurately according to the predetermined trajectory and speed.
In terms of drive technology, linear motors mainly use variable frequency speed control. This method achieves precise control of motor speed and output torque by adjusting the input frequency and voltage of the motor. The main program first initializes the system, completes FFT calculations, and determines overvoltage and overcurrent conditions to ensure safe motor operation. The main interrupt service program controls the operation of the entire system, determines the acceleration and deceleration curve according to the speed command, generates the target voltage value, and then controls the opening time of the three-phase full-bridge switch to generate a PWM signal.
The control system of linear motors also needs to consider the application of feedback devices. In order to achieve precise position control, linear encoders are usually used as feedback devices to directly measure the position of the load and improve position accuracy.
In drive technology, the primary and secondary designs of linear motors are also crucial. When current is passed into the primary winding, an air gap magnetic field is generated. As the three-phase current changes, the air gap magnetic field moves in a straight line to form a traveling wave magnetic field. The secondary conductor generates electromotive force under the cutting of the traveling wave magnetic field, which in turn forms a directional induced current, which interacts with the magnetic field to generate electromagnetic thrust.
The control system of linear motors is highly flexible and programmable. By using advanced control algorithms and programmable logic controllers (PLCs), complex motion control and automation tasks can be achieved.
With the continuous development of technology, the control system and drive technology of linear motors are also constantly innovating. For example, the use of advanced sensor technology and intelligent control algorithms can further improve the accuracy and stability of linear motors.
The control system and drive technology of linear motors are an important part of linear motor technology. By using advanced control algorithms, programmable logic controllers and innovative sensor technologies, high-precision, high-stability and high-efficiency operation of linear motors can be achieved, providing strong power support for fields such as industrial automation and transportation.
