Skip to main content

Two-motor single-inverter field-oriented induction machine drive dynamic performance


Multi-machine, single-inverter induction motor drives are attractive in situations in which all machines are of similar ratings, and operate at approximately the same load torques. The advantages include small size compared to multi-inverter system, lower weight and overall cost. However, field oriented control of such drives is a challenge since no two motors will have exactly the same operating conditions at any time. In general, at least some motors in the system will operate away from perfect field orientation. It is therefore important to analyse their torque dynamics carefully. This paper discusses existing multi-machine field-oriented control methods, and analyses and compares them from the viewpoint of dynamic performance. For this, an analytical framework based on small-signal analysis is developed to compare multi-machine control methods. This analysis is verified by simulations and experiments.

This is a preview of subscription content, access via your institution.

Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.


  • Ando I, Sazawa M and Ohishi K 2004 High efficient speed control of parallel-connected induction motors with unbalanced load condition using one inverter. IECON 2: 1361–1366, 2–6

    Google Scholar 

  • Bouscayrol A, Davat B, De Fornel B, Francois B, Hautier J P, Meibody-Tabar F and Pietrzak-David M 2000 Multi-machine multi-converter system for drives: Analysis of coupling by a global modeling. IEEE Industry Applications Conference 3: 1474–1481

    Google Scholar 

  • Bouscayrol A, Delarue P, Fornel B D, Francois B, Hautier J P, Meibody-Tabar F, Monmasson E, Peitrzak-Davida M, Razik H, Semail E and Benkhoris M F 2005 Control structures for multi-machine multi-converter systems with several couplings by criteria merging. European Conference on Power Electronics and Applications, EPE

  • Crelerot O, Bernot F and Kauffmann J-M 1993 Study of an electrical differential motor for electrical car, Sixth International Conference on Electrical Machines and Drives. pp. 416–420

  • Escané P, Lochot C, DavidM and de Fornel B 1999 Electromechanical interactions in a high speed railway traction system comparison between two drive control structures. EPE Conference

  • Escané P, Pietrzak-David M and de Fornel B 2000 Optimization of a railway traction system drive control vs slip perturbation. Proc. of IEEE Industry Applications Conference, 3: 1909–1916

    Google Scholar 

  • Hartani K, Bourahla M, Miloud Y and Sekkour M 2008 Direct torque control of an electronic differential for electric vehicle with separate wheel drives. J Automation and Systems Eng. 2(2)

  • Inoue T, Ito S, Azegami K, Nakajima Y and Matsuse K 2011 Dynamic performance of sensorless vector controlled multiple induction motor drive connected in parallel fed by single inverter. IEEE Industry Applications Society Annual Meeting (IAS), pp. 1–6, 9–13

  • Iyer J, Tabarraee K, Chiniforoosh S and Jatskevich J 2011 An improved V/F control scheme for symmetric load sharing of multi-machine induction motor drives, 24th Canadian Conference on Electrical and Computer Engineering (CCECE), pp. 1487–1490: 8–11

  • Jeftenic B, Bebic M and Statkic S 2006 Controlled multi-motor drives. International Symposium on Power Electronics, Electrical Drives, Automation and Motion, (SPEEDAM), 1392–1398: 23–26

  • Joshi B M and Chandorkar M C 2012 Power Failure Ride-through in Multi-machine Drives. In Proc. IEEE Energy Conversion Congress and Exposition (ECCE 2012) 15–20

  • Joshi B M and Chandorkar M C 2011 Effect of Machine Asymmetry on a Two-machine Direct Torque Controlled Induction Motor Drive. Proceedings of 14th European Conference on Power Electronics and Applications-EPE 2011, Birmingham, UK, 30 Aug. -1

  • Joshi B M, Patel D C and Chandorkar M C 2011 Machine Interactions in Field Oriented Controlled Multi-Machine Three Phase Induction Motor Drives. Proceedings of the IEEE International Electric Machines and Drives Conference (IEMDC), Niagara Falls, Canada, 15: 18

  • Kazmierkowski M P 1997 Control Philosophies of PWM Inverter-fed Induction Motors. Int. Conference on Industrial Electronics, Control and Instrumentation IECON ’97, 1(P16–P26)

  • Kelecy P M and Lorenz R D 1994 Control methodology for single inverter, parallel connected dual induction motor drives for electric vehicles. In Proc. IEEE PESC’94, pp. 987–991

  • Krause P C, Wasynczuk O and Sudhoff S D 2002 Analysis of Electric Machinery and Drive Systems. New York: Wiley-Interscience

    Book  Google Scholar 

  • Levi E, Bojoi R, Profumo F, Toliyat H A and Williamson S 2007 Multiphase induction motor drives - a technology status review. IET Electric Power Applications, 1(4): 489–516

    Article  Google Scholar 

  • Levi E, Toliyat Jones M, Vukosavic S N and Toliyat H A 2004 A novel concept of a multiphase, multimotor vector controlled drive system supplied from a single voltage source inverter. In IEEE transactions on Power Electronics 19(2)

  • Ma J D, Bin Wu, Zargari N R and Rizzo S C 2001 A space vector modulated CSI-based AC drive for multimotor applications. IEEE Transactions on Power Electronics 16(4): 535–544

    Article  Google Scholar 

  • Matsumoto Y, Ozaki S and Kawamura A 2001 A novel vector control of single-inverter multiple-induction-motors drives for Shinkansen traction system. 16th Annual Applied Power Electronics Conference and Exposition, APEC 1: 608–614

  • Matsuse K, Kouno Y, Kawai H and Yokomizo S 2002 A speed-sensorless vector control method of parallel-connected dual induction motor fed by a single inverter. IEEE Transactions on Industry Applications 38(6)

  • Mohktari H and Alizadeh A 2007 A new multi-machine control system based on Direct Torque Control algorithm. ICPE 1103–1108: 22–26

  • Novotny D W and Lipo T A 1996 Vector Control and Dynamics of AC Drives, Oxford University Press

  • Penã -Eguiluz R, Pietrzak-David M, Riga V and de Fornel B 2002 Comparison of several speed sensorless strategies of two different dual drive induction motor control structures. Power Electronics Congress. Technical Proceedings CIEP 2002. VIII IEEE International 41–46: 20–24

  • Ruxi W, Yue W, Qiang D, Yanhui H and Zhaoan W 2006 Study of Control Methodology for Single Inverter Parallel Connected Dual Induction Motors Based on the Dynamic Model. 37th IEEE Power Electronics Specialists Conference, PESC, 1–7: 18–22

  • Tabbache B, Kheloui A and Benbouzid M E H 2011 An adaptive electric differential for electric vehicles motion stabilization. IEEE Transactions on Vehicular Technology, 60(1): 104–110

    Article  Google Scholar 

  • Taylor D G 1994 Nonlinear control of electric machines: An overview. IEEE Control Syst. Mag. 14: 41–51

    Article  Google Scholar 

  • Turl G, Summer M and Asher G M 2002 A Synchronised Multi-Motor Control System Using Sensorless Induction Motor Drives. International Conference on Power Electronics, machines and Drives pp. 38–43: 4–7

  • Vas P 1998 Sensorless Vector and Direct Torque Control. New York: Oxford University Press

    Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to BHAKTI M JOSHI.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

JOSHI, B.M., CHANDORKAR, M.C. Two-motor single-inverter field-oriented induction machine drive dynamic performance. Sadhana 39, 391–407 (2014).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI:


  • Multi-machine induction motor drives
  • field oriented control dynamics
  • small-signal analysis.