Stator-flux-oriented control of PMSM with highly-dynamic field-weakening operation

Abstract

Excellent torque dynamics are important in traction applications -not because of acceleration or deceleration, but to meet additional demands as supression of drive chain oscillations, slip-slide protection and electronic stability control. Dynamics are limited by the rating and the switching frequency of the inverter, which the control has to make optimal use of. This paper presents a stator-flux-based control scheme for PMSM which gives the maximum physically possible dynamics with regard to the limitations stated above. The simulation results presented are based on a simulation structure which is verified by measurement and simulation carried out at an AFE.

Robust and efficient torque control of permanent magnet synchronous motors in traction applications

“…For stator flux space vectors along the trajectory defined by (5) (a straight line parallel to the y axis), the motor torque is zero. This also holds for stator flux vectors along the x-axis (zero load angle), see torque expression (4). Between the two lines, an increasing load angle leads to increasing torque.…”