Abstract— 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 a costly
affair. This paper presents a low cost and real time electronic
speed controller for BDC motors. The motor is started using
the motor phase saturation inductance change method. Further
control of the motor is established by monitoring the back emf
zero crossing as a feedback. In addition, MATLAB simulink
based simulations have been performed to analyse the circuit
performance under real time input conditions.