© The Institution of Engineering and Technology
The limitations of sensorless control of permanent magnet synchronous machines (PMSMs) are discussed and a viable solution is proposed. The main concept of sensorless control of drives relies on additional information given by the machine during its normal operation. This information provided by the machine is essentially the back-electro motive force and the variance of the stator inductivity, which are dependent on the rotor position. Several approaches and methods have discussed these problems, and in most cases they are not avoidable and that some methods work better on certain speeds of the drives. The direct flux control (DFC) method to combat the above problems at all speeds is presented. The flux linkage signal which contains the necessary information about the rotor position can be measured between the neutral point of a PMSM and an artificial one. The mathematical derivation and the observations from the experiments show that this signal contains a second and a fourth harmonic, which can be used to calculate the rotor position. Furthermore, the limitations of implementing DFC are also addressed.
References
-
-
1)
-
3. Briz, F., Degner, M.: ‘A review of high-frequency methods’, Ind. Electron. Mag., 2011, 5, (2), pp. 24–35 (doi: 10.1109/MIE.2011.941118).
-
2)
-
6. Qiao, Z., Shi, T., Wang, Y., Yan, Y., Xia, C.: ‘New sliding-mode observer for position sensorless control of permanent-magnet synchronous motor’, Trans. Ind. Electron., 2013, 60, (2), pp. 710–719 (doi: 10.1109/TIE.2012.2206359).
-
3)
-
24. Robeischl, E., Schroedl, M.: ‘Optimized INFORM measurement sequence for sensorless PM synchronous motor drives with respect to minimum current distortion’, IEEE Trans. Ind. Appl., 2004, 40, pp. 591–598 (doi: 10.1109/TIA.2004.824510).
-
4)
-
6. Pacas, M.: ‘Sensorless drives in industrial applications-advanced control schemes’, IEEE Trans. Ind. Electron. Mag., 2011, 5, (2), pp. 16–23 (doi: 10.1109/MIE.2011.941125).
-
5)
-
5. Wang, Z., Lu, K., Blaabjerg, F.: ‘A simple start-up strategy based on current regulation for back-EMF-based sensorless control of PMSM’, Trans. Power Electron., 2012, 27, (8), pp. 3817–3825 (doi: 10.1109/TPEL.2012.2186464).
-
6)
-
7. Mantala, C., Müller, T., Thiemann, P., Strothmann, R., Zhou, E.: ‘PMSM sensorless control with direct flux control for all speeds’. 2012 IEEE Symposium on Sensorless Control for Electrical Drives (SLED), Milwaukee, WI, USA, September 2012, pp. 1–6.
-
7)
-
31. Fan, Y., Zhang, L., Cheng, M., et al: ‘Sensorless SVPWM-FADTC of a new flux-modulated permanent-magnet wheel motor based on a wide-speed sliding mode observer’, IEEE Trans. Ind. Electron., 2015, 62, (5), pp. 3143–3151 (doi: 10.1109/TIE.2014.2376879).
-
8)
-
8. Müller, T., See, C., Ghani, A., Thiemann, P.: ‘Simulation of PMSM in Maxwell 3D/simplorer to improve and optimize direct flux control’. IEEE International Symposium on Industrial Electronics, Edinburgh, Scotland, UK, June, 2017.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.1772
Related content
content/journals/10.1049/el.2017.1772
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Correspondence
This article has following corresponding article(s):
in brief
Direct flux control – sensorless control method of PMSM for all speeds – basics and constraints