Rotary electric machine having conductors insulated by insulation sleeve inserted into core slot

A rotary electric machine comprising:

• a core forming a stator or a rotor of the rotary electric machine, a plurality of slots each having a substantially rectangular cross-section being formed in the core;
• an insulation sleeve having a substantially rectangular-cross-section inserted into each slot;
• and
• conductors inserted into the insulation sleeve, wherein:
• the insulation sleeve includes corner portions contacting respective corners of the slot and flat portions positioned in parallel to sidewalls of the slot;
• the flat portions of the insulation sleeve are positioned apart from the sidewalls of the slot, forming certain spaces therebetween when the conductors are not inserted into the insulation sleeve;
• and
• a cross-sectional size of the conductors is so made that the flat portions of the insulation sleeve are pushed against the sidewalls of the slot when the conductors are inserted into the insulation sleeve.