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Sensorless velocity control of permanent-magnet synchronous motors

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2 Author(s)
Shouse, Kenneth R. ; Engine & Vehicle Res. Div., Southwest Res. Inst., San Antonio, TX, USA ; Taylor, D.G.

A sensorless velocity controller for the permanent-magnet synchronous motor is designed using discrete-time reduced order models. A nonlinear observer estimates the rotor position and velocity from stator current measurements, thus eliminating the need for shaft-mounted sensors. The observer is based on least-squares optimization, and exploits a piecewise-bilinear representation of the back-EMF (speed-voltage) function. By smoothly switching from an observer-based closed-loop control to an open-loop control at low velocity, observer ill-conditioning is avoided and reliable operation is achieved under all operating conditions. The new scheme delivers performance comparable to sensor-based closed-loop control, yet requires only a moderate amount of online computation. Experimental results provide evidence of the viability and performance of the new scheme

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:6 ,  Issue: 3 )