DocumentCode :
287382
Title :
Induction motor drive for electric vehicles without speed- and position sensors
Author :
Schroedl, M. ; Hennerbichler, D. ; Wolbank, T.M.
Author_Institution :
ELIN Energieanwendung Wien, Austria
fYear :
1993
fDate :
13-16 Sep 1993
Firstpage :
271
Abstract :
A novel induction motor control is presented which works without mechanical sensors and hence yields cheaper and more robust drive solutions. However, the drive is able to produce full torque even at standstill without tachos and position encoders. This is achieved by using the new INFORM (indirect flux detection by online reactance measurement) flux model. The basic idea is to evaluate saturation effects in the motor in real-time, yielding speed-independent information about the flux axis. The INFORM algorithm is coupled with well-known EMF-based flux models, providing optimal flux information for field oriented control over the full operating range. In the paper, the algorithms for flux and torque control in the base speed and field weakening range are given. At very high speed, the pull-out torque of the motor is taken into account by a special control strategy. The whole drive control including fast current control is realised by software using a digital signal processor, generating directly inverter firing commands. Measurements and practical experiences verify the applicability of the proposed method to electrical traction drives
Keywords :
digital control; electric drives; electric vehicles; induction motors; invertors; machine control; magnetic flux; magnetic variables control; optimal control; parameter estimation; real-time systems; torque control; INFORM; algorithm; base speed; control system synthesis; current control; digital control; digital signal processor; electric vehicles; field oriented control; field weakening; firing commands; induction motor; inverter; machine control; magnetic flux control; optimal control; parameter estimation; real-time; saturation effects; software; standstill; torque; torque control; traction drives;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Power Electronics and Applications, 1993., Fifth European Conference on
Conference_Location :
Brighton
Type :
conf
Filename :
265100
Link To Document :
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