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A sensorless control system for a surface mounted permanent magnet (PM) machine is developed which uses measurement of motor current derivative during the fundamental PWM vector excitation only. Vector extension is required when the vector width falls below a minimum time duration. The extension is made to allow the high frequency switching oscillations due to parasitic capacitances in the drive to...
This paper addresses the position estimation of surface mounted permanent magnetic machine drives over a wide speed range including zero frequency. The proposed tracking method integrates the transient excitation of the main flux saturation with standard space vector PWM (SVPWM) sequence. No additional signal injection or separate test vector is required although a small degree of modification is...
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