A Direct Torque Control Method of Permanent Magnet Synchronous Motor Based on Double Fuzzy Control

Abstract

The invention discloses a direct torque control method for permanent magnet synchronous motors based on double fuzzy control. The current torque error, stator flux error and stator flux angle position are input into the fuzzy controller, and the three input quantities are in the fuzzy controller. After fuzzification, fuzzy reasoning and defuzzification processing in the controller, the selected basic voltage vector is output; the current torque error, torque error change rate, and stator flux error are input into the fuzzy controller, and after fuzzification and fuzzy reasoning After the defuzzification process, output the duty cycle corresponding to the selected basic voltage vector; determine the six basic voltage vectors V from the origin to the six vertices of the hexagon according to the permanent magnet synchronous motor inverter voltage vector diagram 1 ~V 6 And a zero-voltage vector, the basic voltage vector is selected by the fuzzy controller, and the corresponding amplitude of the voltage vector is determined according to the fuzzy controller, and then output to the permanent magnet synchronous motor through space vector modulation to complete direct torque control. The invention can effectively reduce torque ripple.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a direct torque control method of a permanent magnet synchronous motor based on double fuzzy control. Background technique [0002] The direct torque control technology is based on the stator flux coordinate system and directly takes the torque as the control object, avoiding a large number of calculations during the transformation of the rotating coordinates and the dependence on the motor parameters. It has good dynamic performance and short torque response time. [0003] In the direct torque control system of surface type permanent magnet synchronous motor, there are six basic voltage vectors and one zero voltage vector. Since the torque and flux linkage adjustment in conventional direct torque control adopt two discrete hysteresis controllers, usually It is easy to select the same voltage vector when the torque and flux linkage errors are large or small, res...

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Problems solved by technology

[0003] In the direct torque control system of surface type permanent magnet synchronous motor, there are six basic voltage vectors and one zero voltage vector. Since the torque and flux linkage adjustment in conventional direct torque control adopt two discrete hysteresis controllers, usually When the torque and flux linkage errors are large and small, it is easy to select the same voltage vector, resulting in slow torque response of the system and easy increase of torque ripple

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