Sensorless Control of im for Limp-Home Mode EV Applications

Ehsan Dehghan-Azad, Shady Gadoue, David Atkinson, Howard Slater, Peter Barrass, Frede Blaabjerg

Research output: Contribution to journalArticlepeer-review


This paper presents a novel speed estimation scheme for induction motors (IMs) based on back electromotive-force model reference adaptive system (back-EMF MRAS). The scheme is employed for the purpose of sensorless fault-Tolerant torque-controlled drives used in a limp-home mode operation in electric vehicle (EV) applications. The proposed scheme was experimentally tested on a laboratory dynamometer using a 19-kW IM and a 29-kW controller, which are both currently used in the automotive industry for EV applications. The scheme was also implemented on an electric golf buggy which was equipped with a 5-kW IM. A performance comparison was carried out between the proposed and conventional back-EMF MRAS schemes for starting from standstill, sensitivity to parameter variations and constant speed operation with load variations. Utilizing the golf buggy, the behaviors of the new scheme was separately investigated for vehicle starting from standstill, wide speed range including field weakening region, and hill-starting operations. The proposed scheme is computationally easy to implement, robust against sensitivity to parameters variations, inverter nonlinearity and errors due to digitization in the field weakening region. This scheme is not only consistent for vehicle starting from standstill, it also provides a reliable vehicle-drive in the field weakening region and during vehicle hill-starting. The dynamometer and vehicle test-drive results show the suitability of the proposed scheme for the purpose of EV fault-Tolerant limp-home mode operation.

Original languageEnglish
Article number7740955
Pages (from-to)7040-7050
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number9
Early online date10 Nov 2016
Publication statusPublished - 10 Nov 2016

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  • Electric vehicles (EVs)
  • fault tolerant
  • induction motor (IM)
  • model reference adaptive system (MRAS)
  • sensorless
  • torque controlled-drive (TCD)


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