| Abstract |
Surface mount magnet trapezoidal back emf PM synchronous machines, commonly referred to as "Brushless DC" machines, are commercially available in sizes ranges from fractional to tens of horsepower. These machines employ quasi square wave current drive, have concentrated full pitch stator windings and nearly full pitch totor magnet segments, and are almost universally configured as wye connected (iolated neutral) three phase units. In this paper, we show the benefits of extending this type of machine design in both radial and axial air gap versions to five phase, full pitch stator winding geometries. Not only are the torque capacities of similarly sized machines increased, but the peak VA requirements of the switching devices in the coupled solid-state drive circuits are reduced as well. This paper details specific designs for both radial and axial gap five phase machines at the 10 HP level and presents simulated results for the operation of the accompanying 10-device solid-state voltage source drive circuit. |
