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The speed and position estimation from Back EMF has been a problem under speed reversal response due to change of sign of speed. In this paper, an algorithm using fuzzy logic is proposed to estimate the speed and position of BLDC motor from back EMF for sensorless brushless DC (BLDC) motor drives to improve the performance of conventional sensorless drives. Most existing sensorless methods of the...
Although magnetic bearing motors suffer no friction loss and hence require no lubrication, they are not widely used because of their high cost and large size. To solve these problems, a self-bearing motor having a simple structure with distributed windings is proposed. The rotor consists of a permanent magnet and an iron yoke that rotates in the body. The stator consists of a six-phase distributed...
BLDC motors have been gaining attention from various industrial and household appliance manufacturers, because of its high efficiency, high power density and low maintenance cost. After many research and developments in the fields of magnetic materials and power electronics, their applications to electric drives have increased to a significant extent. In this paper, the modeling of Brushless DC motor...
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...
This paper deals with an extension of Park's transformation to model permanent magnet (PM) non- sinusoidal machines by means of the so-called pseudo-dq axes reference frame. Speed and torque vector control can then be implemented resulting in a motor drive performance close to that of sinusoidal PM machines drives. Similarly, the proposed control algorithm is derived by decomposing the machine current...
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