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This paper presents a novel method based on delaying Hall signal for reducing torque ripple of brushless DC motor. During the delayed interval, the back electromotive force (back-EMF) amplitude of outgoing phase declines and the phase current rises to stabilize phase voltage. The electromagnetic torque can remain steady by regulating the duty ratio. During the commutation interval, the time of outgoing...
Doubly salient brushless dc (DSBLDC) motors have attracted increasing attention for drive system due to the simple and rugged rotor structure, brushless operation and low cost. Open circuit (OC) faults in power converter as a common fault reduce system performance. The majority of the tolerance approaches require additional hardware which increases the cost. This paper proposes a fault-tolerant control...
Sensorless control of brushless DC motors (BLDCMs) by detecting back electromotive force (back-EMF) is widely used because of ease of equipment. As conventional method, back-EMF detecting method by using phase lock loop (PLL) is used. This method uses the nature that back-EMF of γ-axis is related to estimated angular error. As usual, back-EMF of d-axis is zero in the case of using position sensor...
Rapid development of extremely-low voltage high current MOSFETs allows reversing common design principles to explore new applications, such as battery powered traction drives. This enables the usage of multi-phase single-turn stator windings which can achieve a copper fill factor close to one. This paper briefly describes the proposed 2V, 1.1kW MOSFET commutated 13-phase permanent magnet DC motor...
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