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Brushless DC (BDC) motors are widely used in aerospace applications because of their high power to weight ratio, low maintenance and reliable operation over long periods of time. These advantages also make them preferred over brushed DC motors for several other applications. But the requirement of an electronic speed controller for commutation and customization for specific applications makes BDC...
In this paper, an accurate method for sensorless control of permanent magnet brushless motors is explained. The method doesn't include any modification to the classical construction of such motors and can be easily integrated within the drive electronics. It is applicable to both motor types, i.e. those with sinusoidal or trapezoidal back EMF.. The back EMF waveform is extracted on-line using simple...
The paper is focused on a sensorless controller design for a brushless DC motor. By utilizing the saturation effect of stator iron core, a low-frequency and low-voltage injection scheme is employed to estimate the initial rotor position. This scheme requires neither any current and position sensors nor faster sampling frequency and shorter time needed to complete processing and estimating such that...
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