Hermetic motor stator

A stator lamination for a dynamoelectric machine comprising:

• a piece of magnetic material having an outer peripheral portion and an inner peripheral portion defining a cylindrical bore;
• said lamination having an outer peripheral yoke portion and having a plurality of teeth extending from the yoke portion toward the bore;
• the teeth defining spaced apart winding turn receiving slots therebetween and the slots being of predetermined areas;
• the lamination having at least two diametrically opposed flat segments along the outer peripheral portion thereof;
• said plurality of teeth defining a plurality of slots disposed symmetrically about a line passing through the flat segments and the center of the bore;
• said teeth being arranged to define a pattern of slots having areas of different sizes;
• a first slot on either side of the line being of a first predetermined size, a group of three slots each of a second predetermined size adjacent each such first slot, and a group of two slots each of a third predetermined size next adjacent each group of three slots;
• the third predetermined size being larger than the second predetermined size, and the second predetermined size being larger than the first predetermined size;
• said yoke portion having at least two fastener accommodating passageways formed therein with each of the at least two passageways located in a region of the yoke adjacent to slots of a second predetermined size so that the fastener accommodating passageways can be provided in the yoke portion without unduly restricting the flux carrying capacity of the lamination.

A stator assembly for a dynamoelectric machine, a magnetic stator core having a plurality of winding slots formed therein each having a closed end;

• at least two diametrically opposed flat segments located on an outer periphery of the stator core;
• a primary winding comprising at least two primary poles having a primary polar axis, each primary winding pole comprising a plurality of coils each having sides occupying a different pair of the slots;
• and an auxiliary winding comprising at least two auxiliary poles having an auxiliary polar axis angularly displaced from the primary polar axis, the auxiliary winding comprising winding turns disposed in slots of the core;
• the primary polar axis bisecting the diametrically opposed flat segments;
• a first slot on either side of and adjacent to the primary polar axis being of a first size, three slots next adjacent each first slot being of a second size and two slots adjacent the three slots being of a third size;
• the third size being larger than the second size and the second size being larger than the first size;
• the first slots being of a size to permit accommodation of backlash auxiliary winding turns without unduly restricting a region of the stator core adjacent the first slots whereby turns of congenerous types of auxiliary windings may be effectively utilized with a single stator slot structure.

A dynamoelectric machine stator having a core formed of magnetic material, said core comprising a yoke section, a bore disposed radially inwardly of such yoke section and a plurality of angularly spaced apart elongated winding receiving slots extending toward the bore;

• the core having at least two longitudinally extending passageways disposed radially outwardly of the slots at a predetermined distance from the center of the bore;
• the core having at least two diametrically opposed flat portions on an outer portion of the core;
• a primary winding comprising at least two primary poles having at least one primary polar axis, each primary winding pole comprising a plurality of coils each having sides occupying a different pair of the slots;
• an auxiliary winding comprising at least two auxiliary poles having at least one auxiliary polar axis angularly displaced from the at least one primary polar axis;
• the at least one primary polar axis passing through the diametrically opposed flat portions;
• and the slots forming a preselected pattern of slot sizes symmetrical about the at least one primary polar axis with a first slot nearest the at least one primary polar axis being of a first size, three slots next adjacent each first slot being of a second size;
• two slots next adjacent the three slots being of a third size, and wherein the third size is larger than the second size, and the second size is larger than the first size;
• so that flux carrying capacity of the stator core in the vicinity of the at least two passageways is greater than it would be were the slots of a second size to be equal in size to the slots of a third size and whereby two different passageway patterns may be used.