Simo Motor Speed Control System: An Introduction to the AC Induction Motor Speed Control System of the Simo Series: Due to their simple structure, reliable operation, easy maintenance and affordable price, the AC induction motors of the Simo series are widely used in various fields of the national economy and social life.

This Simo motor speed control system utilizes the rapid data collection and data processing capabilities of a microcontroller. The system has a sensitive response, smooth adjustment and constant speed. Compared with the traditional cascade speed control, the system has a simple circuit configuration and high reliability. The principle is the same as that of series resistance speed control in terms of comparison, with similar efficiency. However, this system is a continuous speed control without contact control, with a small size, high reliability and high adaptability, and can be used in various types of motors in the series. Since this Simo motor speed control system adjusts the speed by changing the output mechanical characteristics of the motor, it is not possible to adjust the speed when the motor is under no load or with reverse load. When operating at low speed, the efficiency of the motor decreases. These problems also exist in the series resistance cascade speed control.

The frequency conversion speed control of Simo motors makes the speed control more precise and smooth, achieving continuous speed control. At the same time, by adopting a closed-loop constant speed operation scheme, the operating speed is kept constant. Its characteristics are superior to those of the traditional series resistance speed control, and it can completely replace the series resistance speed control and slip motors. The speed control range is 6:1 and can reach 10:1 in short-term operations. For equipment that uses wound motors with series resistance speed control, satisfactory speed control results can be obtained with a smaller investment by using the existing motors, which further expands the use of the Simo motors of the JR series.