Patent ID: 6348752
Filing Date: 2002-02-19
Classification: F25B,F25D,H02K,H02P,Y10S,Y10T

Abstract:
A refrigeration system comprising a compressor, a refrigerant carrying condenser coil, a refrigerant carrying evaporator coil, and at least one air moving motor assembly for moving air across at least one of said refrigerant carrying coils; said air moving motor assembly comprising a brushless DC motor having a permanently magnetizable rotor magnetized to establish at least one north and at least one south pole with a magnetic transition region located between adjacent north and south rotor poles, a C-frame ferromagnetic stator core defining a rotor accommodating bore, and a plurality of energizable winding turns disposed about a portion of the stator core for establishing alternating north and south magnetic poles in the stator core at locations adjacent to the bore; said stator core including a pocket for receiving a magnetic flux sensing device, and said bore having a discontinuity therealong so that magnetic flux associated with the rotor is not shielded from the pocket by ferromagnetic stator core material; said bore further including at least two stepped regions each having an arcuate extent of about thirty-five degrees, with the depth of the step in each of the two stepped regions being at least about 1.0 mm; and said bore further having a region establishing a magnetic flux path anomoly at a location on the bore opposite the location of the bore discontinuity.