Brushless DC motor direct torque control system and control method

Abstract

The invention discloses a brushless direct current motor direct torque control system and control method, the system includes a photoelectric encoder, a stator current and terminal voltage detection circuit, a speed calculator, a speed error comparator, a speed regulator, and a flux linkage observer , Flux linkage error comparator, flux linkage hysteresis comparator, torque observer, torque error comparator, torque hysteresis comparator, PWM controller and three-phase bridge inverter circuit. The photoelectric encoder collects the position information of the motor rotor, calculates the actual speed according to the rotor position information, calculates the given value of the stator flux linkage according to the rotor position information and the reference torque, and collects the three-phase current and terminal voltage of the stator to calculate the actual electromagnetic torque And the actual stator flux, the PWM controller generates a voltage vector according to the torque error and the flux error, and drives the inverter circuit through the voltage vector to realize the stable operation of the motor. The invention does not need to calculate the flux linkage in real time, simplifies the system program, and improves the control efficiency.

Description

technical field [0001] The invention belongs to the technical field of brushless direct current motor control, and in particular relates to a direct torque control system and control method of a brushless direct current motor. Background technique [0002] Brushless DC motor is a new type of DC motor developed on the basis of traditional DC motors. It has the advantages of simple control, high efficiency, good dynamic response, and high reliability. At present, the application of brushless DC motors has developed rapidly from the initial military industry to the fields of aerospace, information, production, medical treatment and industrial automation. [0003] Direct torque control is a high-performance motor speed regulation technology. It abandons the decoupling control idea of ​​vector control and uses the direct closed-loop of motor torque flux to obtain fast torque response and excellent control performance. Induction motors and permanent magnet synchronous motors have...

AI Technical Summary

Problems solved by technology

The Chinese patent application with the publication number CN 101702607A sets the rotor induction flux linkage reference and the stator armature reaction flux linkage reference respectively, and then obtains the stator flux linkage vector through the vector synthesis method from these two parts, and obtains the given value, this method needs to calculate the flux linkage in real time, which will make the system complex and will not be conducive to engineering implementation

Images