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The paper proposes an implementation of a motion sensorless control system in a very wide speed range -from zero speed operation, based on direct and quadrature inductance components of the stator flux linkage for the interior permanent magnet synchronous motor-IPMSM, without signal injection. The proposed observer is developed using the Lyapunov design, resulting a scheme with a full observer for the motor states. The observer assures stability even for zero speed. The proposed observer can be applied to other types of synchronous machines such as surface permanent magnet synchronous motor-SPMSM, dc. excitation SM, variable reluctance synchronous motor-VRSM or transverse-flux motors-TFMs. Extensive experimental results are presented to verify the principles and to demonstrate the effectiveness of the proposed sensorless control system. With the so-called by the authors-the "stator flux linkage d-q inductances components observer", the IPMSM vector controlled drive system operates from zero to the maximum speed of more then six times the rated speed-on the flux weakening region. The experiments were conducted on 2.7kW IPMSM which is vector controlled by a floating-point TMS320C6713-Digital Signal Processor. The results prove very good dynamic performances in all ranges of speed and torque operation.

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