Direct torque control system

Abstract

The invention discloses a direct torque control system. An output end of an internal torque giver is connected with an input end of a torque comparator / magnetic flux comparator, rotational speed setup is connected with the internal torque giver through a PID (proportion integration differentiation) adjuster after being compared with actual rotational speed feedback, magnetic flux optimizer and a magnetic flux brake are respectively connected with the internal torque giver, the output end of the internal torque giver and an output end of an adaptive motor model are connected with an input end of the torque comparator / magnetic flux comparator, an output end of the torque comparator / magnetic flux comparator is connected with an input end of an optimized pulse selector, and a main power supply circuit is used for optimizing the whole control system by using a control circuit for controlling and adjusting the torque of a motor. The direct torque control system has the advantages that by means of measurement of torque and magnetic flux, open and closed states of an inversion circuit are adjusted immediately, and then the torque and the magnetic flux are further adjusted so that precise control is achieved.

Description

technical field [0001] The invention relates to a direct torque control system, in particular to a direct torque control frequency converter control system, which belongs to the technical field of frequency conversion speed regulation control. Background technique [0002] In the current industry, the pole-changing speed regulation, electromagnetic speed regulation and voltage regulation speed regulation methods are used. Electromagnetic speed regulation asynchronous motor (slip motor) Electromagnetic speed regulation asynchronous motor is also called slip motor. It is a constant Torque AC stepless variable speed motor. Because it has a series of advantages such as wide range of speed regulation, open slip of speed regulation, large starting torque, small control power, negative speed feedback, and high hardness of mechanical characteristics during automatic adjustment system, it is widely used in printing machines, saddle stitchers, wireless Binding, high-frequency drying ...

AI Technical Summary

Problems solved by technology

Edit this paragraph Disadvantages The main disadvantages of electromagnetic speed-regulating asynchronous motors with speed negative feedback are: when there is no load or light load (less than 10% of rated torque), it will cause runaway due to insufficient feedback; As the speed decreases, the output power and efficiency of the clutch also decrease proportionally

In addition, due to the complex structure, the efficiency of the pole-changing motor is slightly lower than that of the conventional general-purpose motor

Moreover, the torque and flux of the motor cannot be adjusted precisely

Images