Optimal torque control of synchronous motor drives: Plug-and-play method

Abstract

Abstract-This paper deals with the optimal state reference calculation for synchronous motors with a magnetically salient rotor. A look-up table computation method for the maximum torque-per-ampere (MTPA), maximum torque-per-volt (MTPV), and field-weakening operation is presented. The proposed method can be used during the drive start-up, after the magnetic model identification. It is computationally efficient enough to be implemented directly in the embedded processor of the drive. For experimental validation, a 6.7-kW synchronous reluctance motor drive is used.

Flux-Linkage-Based Current Control of Saturated Synchronous Motors

“…1 is augmented with a speed controller, which provides the torque reference based on the speed reference ω m,ref and the measured speed ω m . The optimal current references are calculated based on the torque reference and the measured DC-link voltage [20]. The motor is accelerated from zero to the speed of 2 p.u.…”

Observers for Sensorless Synchronous Motor Drives: Framework for Design and Analysis

“…The flux-linkage controller and its tuning is based on the discrete-time controller presented in [24]; only the state variable to be controlled has been changed from the current to the flux. The flux reference ψ ref is determined from T ref andω m using the optimal torque control scheme [25], which includes the MTPA locus, field weakening, and MTPV limit.…”

Current Control of Saturated Synchronous Motors

“…with the maximum available torque, when the current limit is 1.5 p.u. The optimal current references are calculated using the method available in [13]. Design 1 is unstable at this bandwidth of α = 2π • 200 rad/s and significant ringing in current components is observed for Design 2.…”