The sensorless control of an axial flux permanent magnet motor drive is proposed and tested. The motor is not purposely designed for sensorless control and shows a very small inherent saliency. This significantly affects the saliency-based position estimation in the low speed region. Other nonidealities, such as the non-sinusoidal back-EMF waveforms and possible misalignment between stator and ...

This paper deals with the sliding mode theory for direct torque and flux controlled (DTFC) induction motor drive. The aim of this paper is implementation of sliding mode theory for design of robust sensorless control of the drive with DTFC. This contribution describes proposed control and flux observer as well as presents simulation results and experimental evidence of the laboratory prototype ...

A physcial approach is employed to estimate the rotor flux for a position sensorless induction machine drive system. This approach i s based on the fundamental operating characteristics of the induction machine. The estimator structure calculates the rotor flux accurately at low speeds, and as laryely insensitive to parameter variations. System structure, theoretical analysis, simulation, and l...

This paper presents a new position-and-velocity sensorless control of brushless dc motors using an adaptive sliding mode observer. The sliding mode observer is robust to measurement noises. Stability of the adaptive scheme is assured and estimation errors due to parameter deviations are analyzed.

Adaptive optics is implemented in a harmonic generation microscope using a wavefront sensorless correction scheme. Both the second- and third-harmonic intensity signals are used as the optimization metric. Aberration correction is performed to compensate both system- and specimen-induced aberrations by using an efficient optimization routine based upon Zernike polynomial modes. Images of live m...

Sensorless control technology of PMSMs is great importance for safety and reliability in electric vehicles. Among all existing methods, only the extended flux-based method has performance over speed range. However, accuracy flux rotor position observer are greatly affected by dead-time effect. In this paper, adopted to develop a sensorless system. The influence effect on analyzed correction spe...

The development procedure of permanent magnet drives for sensor less operation beginning from standstill under overload conditions has to consider different design aspects coevally. First, the robust rotor position sensing by test signal enforces a design with a strongly different behavior of the spatial dq-oriented differential inductance values. Therefore, the interior rotor magnet array arra...