access icon free Determination of the inductance parameters for the decoupled d–q model of double-star permanent-magnet synchronous machines

© The Institution of Engineering and Technology
Received 14/06/2013, Accepted 16/09/2013, Revised 22/08/2013, Published 05/11/2013

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.

Inspec keywords: synchronous machines; inductance measurement; invertors; magnetic flux; electric current control; electric current measurement; stators; closed loop systems; permanent magnet machines; finite element analysis; control system synthesis; machine control; electric drives

Other keywords: flux linkage; phase-variable inductance waveform; current measurement; voltage-equation-based method; voltage-source inverter; VSI; inductance measurement; three-phase PM machine; double-star permanent-magnet synchronous machine; rotor position; model-based closed-loop controller; electric drive; stator resistance; model-based control design; decoupled d–q model; current control; finite-element analyses

Subjects: Impedance and admittance measurement; Finite element analysis; Control system analysis and synthesis methods; Current control; Drives; Control of electric power systems; Synchronous machines; Finite element analysis; Power convertors and power supplies to apparatus; Current measurement

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