Improved position offset based parameter determination of permanent magnet synchronous machines under different load conditions

Abstract

This study proposes a novel method for the parameter determination of permanent magnet (PM) synchronous machines under different load conditions. It can identify the total dq-axis flux linkages and also the PM flux linkage separately by the addition of a pair of negative and positive position offsets. It is also noteworthy that the influence of uncertain inverter non-linearity and winding resistance is cancelled during the modelling process, and the experimental results on two different PM synchronous machines show a good agreement with the finite-element prediction results. More importantly, it shows good performance in online tracking the variation of PM flux linkage, which is an important feature for aiding the condition monitoring of PMs, for example, monitoring the temperature of PMs. q2 gains of distorted voltages due to inverter non-linearity on dq 1-and dq 2-axes

Improving the Tracking Performance under Nonlinear Time-Varying Constraints in Motion Control Applications: From Theoretical Servo Model to Experimental Validation

“…Regular users who lack design data cannot successfully build an exact model of the machine. In the dynamo method [21], the dedicated instrumentation is set up as a speed-controlled follower and a driver. ey are connected together as twin motors, and a host computer plays the role of data logger.…”

“…e disadvantage of this method is that it is only accessible for motor designers, since others do not have enough data to establish a numerical or finite element model of the machine. In another approach, dynamo [21] requires a speed-controlled prime mover with dedicated instrumentation. It maps the flux of a machine and utilizes phasor interpretation to obtain equivalent circuit parameters.…”

Parameter Identification and Self-Commissioning in AC Motor Drives: A Technology Status Review

“…The basic idea of these identification methods is to apply a current vector of varying magnitude along a predetermined direction with respect to rotor permanent magnets and observe the machine response. With a PM machine at hand, the application of a current vector is bound to produce torque, thus the rotor should either be free to rotate [54], [55], [70], [80] or it must be locked by mechanical means [68] to properly estimate parameters. For SyRMs, the current vector along the axis boundaries (i.e.…”

Current-Controller-Free Self-Commissioning Scheme for Deadbeat Predictive Control in Parametric Uncertain SPMSM

“…One accepted conclusion is that the Ld and Lq mismatches will cause current steady state error (CSSE) or even make the DBPC unstable. But the inductance is a function of magnetic saturation [11]. When considering the inductance variation under the saturated effect, the concept of incremental and apparent inductances must be concerned [12].…”