Small-signal finite-element modeling of synchronous machines for sensorless applications

Abstract

This paper presents a novel strategy to compute the high-frequency signal injection response of an electrical machine adopted in a sensorless electric drive. Thanks to the proposed strategy the self-sensing capability of the machine can be evaluated during the design process. A small-signal model of the machine in the d-q reference frame is derived and adopted to perform suitable finite-element (FE) simulation to compute the machine parameters at the injection frequency. The proposed procedure is validated by the comparison with other simulation strategies as well as with experimental results

Integrated-Starter/Alternator with sensorless ringed-pole PM synchronous motor drive

“…In the case of null mutual inductance the direction of the maximum axis coincides with the actual d-axis. On the contrary, if l dq h = 0, there is an estimation error equal to the reports in (10). On can note that the error has the same expression found in the case of pulsating injection and reporter in (4).…”

“…The experimental results are reported in Fig. 14 (black line) with the l Δ h behaviour obtained by means of finite element analysis [10] (red line). One can note the good correspondence between the two behaviours confirming the goodness of the experimental tests.…”

Dynamic Modeling of Dual-star Permanent-magnet Synchronous Machines Using Look-up Tables

“…In the CP model, d-and q-axis and mutual inductances besides for both stars need to be calculated. Frozen permeability method (FPM) [14] is used for taking saturation into account. First, both stars are fed with the average value of their d-and q-axis currents while PMs are active, and the permeability of elements obtained by non-linear FE analysis is saved.…”

Analysis and Tests of the Sensorless Rotor Position Detection of Ringed-Pole Permanent-Magnet Motor

“…Once the currents i sd and i sq are computed, it is possible to evaluate the saliency of the machine reconstructing the current trajectory in the d−q plane. The adopted finite-element procedure is described in more detail in [11].…”

“…In the past, additional aspects (as eddy current losses in permanent magnet, hysteresis of lamination) have been neglected during the analysis. Recent Manuscript works have started to take these aspects into account, as for example in [10], [11].…”