Offline method for experimental identification of load-dependent saturation of induction motor taking into account variation of inverse rotor time constant

• Published in: IET power electronics Vol. 13; no. 9; pp. 1828 - 1836
• Main Authors: Lipcak, Ondrej, Bauer, Jan
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 24.07.2020
• Subjects: Research Article; magnetic flux; machine control; experimental identification; induction motor; induction motors; inverse rotor time; rotor design; induction machine parameters; improved experimental method; power 12.0 kW; account variation; nonmeasurable quantities; load-dependent saturation; conventional iron saturation; machine vector control; 12 kW motor show; rotor flux oriented control; estimated rotor flux position; field-oriented control strategies; rotors; magnetising inductance; standard no-load test; induction motor drives; rotor leakage inductance; asynchronous machines; control loops; offline method; parameters whose detuning; saturation occurring; parameter mismatch; constant parameter model
• ISSN: 1755-4535; 1755-4543
• DOI: 10.1049/iet-pel.2019.1361

Accurate knowledge of induction machine parameters has a direct impact on the overall performance of field-oriented control strategies. In the case of rotor flux oriented control, parameter mismatch causes a discrepancy in the estimated rotor flux position and amplitude. Magnetising inductance is one of the parameters whose detuning has a direct impact on the setpoints of the control loops and estimation of hardly or non-measurable quantities. Conventional iron saturation, which can be obtained by a standard no-load test, is not the only type of saturation occurring in the machine. Depending on the rotor design, the magnetising inductance and the rotor leakage inductance may also strongly saturate as a function of load and, thus, rotor current. Based on the authors’ previous work, a new, improved experimental method for identifying the load-dependent saturation of induction motor, which takes into account variation of the inverse rotor time constant, is proposed. Experimental results conducted on 12 kW motor show improved static and dynamic behaviour of the drive compared to the constant parameter model.