A Novel Fuzzy-Logic-Controller-Based Torque and Flux Controls of IPM Synchronous Motor

This paper presents a novel fuzzy logic controller (FLC)-based wide-speed-range operation of interior permanent-magnet synchronous motor (IPMSM) drives. The proposed FLC is designed in such a way that it can simultaneously control both torque and flux of the motor while maintaining current and voltage constraints. Thus, a stand-alone FLC is utilized, whose outputs are d- and q-axis currents. The proposed FLC is designed based on conventional maximum torque per ampere operation below the rated speed and the field-weakening operation above the rated speed. The complete IPMSM drive is experimentally implemented, utilizing dSPACE DSP board DS1104 for a prototype 5-hp motor. The performance of the proposed drive is tested both in simulation and experiment at different operating conditions. The robustness of the controller and its prospective real-time industrial drive application are evidenced by the results.

Nomenclature

,

–-axis voltage.

,

–-axis current.

,

–-axis inductance.

Stator resistance per phase.

,

Motor command speed and rotor speed.

Motor rated speed.

Number of pole pairs.

Magnetic flux linkage.

Maximum phase voltage amplitude.

Maximum line current amplitude.

Maximum terminal voltage neglecting stator resistance.

, ,

Scaling factors for speed error, speed, and acceleration.

,

Scaling factors for fuzzy controller output - and -axis currents.