Determination of the inductance parameters for the decoupled d – q model of double‐star permanent‐magnet synchronous machines

Abstract

Analytical models are the key tools in the model-based control design of electric drives. The inductances together with the stator resistance are the fundamental parameters of these models. In this study three methods to determine the inductances of the decoupled d-q model of double-star permanent-magnet (PM) synchronous machines are studied. These methods have commonly been used to determine the inductances of conventional three-phase PM machines. Two of the evaluated methods are based on the phase-variable inductance waveforms and flux linkages and are thus analysed with finite-element analyses only. The third method, based on the analytical stator voltage equations, can be applied straightforwardly with the real drive system supplied with voltage-source inverters (VSIs). This method requires only the knowledge of the rotor position and the existing current measurements of the VSIs that are used for the current control. Experimental results are provided to verify the applicability of the voltage-equation-based method to determine the inductances. On the average, the presented methods provide similar values, but also some discrepancies between the obtained values can be observed. The measured inductance parameters are validated using model-based closed-loop controllers.

Recent Advances in the Design, Modeling, and Control of Multiphase Machines—Part I

“…While multiphase machines with distributed windings are considered in [43,44], multiphase machines with concentrated windings are analyzed in [45], where the magnetizing inductances of the fundamental and thirdharmonic components in a 15-phase induction machine are estimated using a Fourier analysis of the air-gap flux density distribution and a distributed magnetic circuit approach. Similarly, different off-line identification methods have been developed for the estimation of the electrical parameters of a dual asymmetrical three-phase IPM machine in [46]. The study is complemented with [47], where a recursive leastsquare algorithm is applied for their estimation during normal operation of the drive.…”

Parameter Estimation of Asymmetrical Six-Phase Induction Machines Using Modified Standard Tests

“…2. Corresponding parameters for the developed VSD model can be obtained using Table III and correlations in (10). It is worth noting that in normal operation with isolated neutrals, the zero-sequence subspace has no effect on the machine performance.…”

“…Consequently, various parameter estimation methods have been proposed over the years for three-phase machines [1]- [3]. Since multiphase machines have gained popularity in the research community in the past two decades, some research efforts have been devoted to the parameter estimation for multiphase machines as well [4]- [10].…”

Analytical Calculation of D- and Q-axis Inductance for Interior Permanent Magnet Motors Based on Winding Function Theory

“…The d-and q-axis inductances are key parameters for the performance design including flux-weakening capability, power factor and control strategy [13][14][15]. For the first stage of the IPM motor design, the calculation of d-and q-axis inductances in no-load condition is crucial.…”