A NOVEL SINGLE-SWITCH-PER-PHASE CONVERTER TOPOLOGY FOR 4-QUADRANT PM BRUSHLESS DC MOTOR DRIVE

Considerable attention has recently been given to finding compact and low-cost converter topologies for permanent magnet (PM) brushless moto r drives to meet the emerging high-volume low-performance applications , such as in HVAC, air handlers, fans, pumps, small process drives, ha nd tools, appliance drives, and many others in the range of fractional to 1-hp rating, This paper is concerned with such an attempt to formu late a novel converter topology for a four-quadrant PM brushless dc (P MBDC) motor drive, The proposed topology has a single switch per phase , limiting the motor drive to half-wave operation, However, it also en dows unique features with high reliability, such as shoot-through-free topology by having a switch always in series with a phase winding, op erational possibilities, even with one- or two-phase windings failure, reducing the converter losses to half that of the full-wave inverter, reduction of gate drivers and amplifiers, and reduction in the lose p ower supplies requirement, Many of these features result in low cost a nd compact packaging of the converter for the PM brushless de motor dr ive, The machine design modification requirement due to the half-wave operation of the proposed converter is derived in this paper to help i n the realization of the proposed motor drive in industrial applicatio ns, The formulation and description of the circuit topology and its op eration with the motor, their dynamic modeling, simulation and analysi s, and its comparison to the full-wave-inverter-fed PMBDC motor drive are the key contributions of this paper.