Induction motor, compressor, air blower, and air conditioner

An induction motor comprising:

• a stator;
• a rotor that is provided inside of the stator via an air gap;
• and a squirrel-cage secondary conductor that is formed by filling a rotor slot of a rotor iron core of the rotor with a nonmagnetic and conductive material, wherein
• the rotor slot includes
• an outer circumferential slot that is formed near an outer circumference of the rotor, and
• an inner circumferential slot that communicates with the outer circumferential slot and that is formed at a position radially inside of the outer circumferential slot,
• the stator includes a stator iron core, and a winding that is inserted into a slot formed in the stator iron core,
• the stator iron core includes
• a core back that is formed near an outer circumference of the stator iron core,
• a plurality of teeth that are formed to extend radially from an inner circumference of the core back in a direction of the rotor,
• a slot that is formed between two of the adjacent teeth, and
• a slot opening part that is formed in the slot, and that is open to the air gap, and wherein
• when dimensions of respective elements of the rotor slot are defined as follows:
• TB:
• a shortest distance between a center side of the inner circumferential slot, where the outer circumferential slot is formed, and the outer circumference of the rotor;
• TC:
• a circumferential width of an innermost circumference of the outer circumferential slot;
• TD:
• a circumferential width of an outermost circumference of the inner circumference slot;
• and
• TE:
• a shortest distance between an end side of the inner circumferential slot and the outer circumference of the rotor, and when dimensions of respective elements of the stator iron core are defined as follows:
• TF:
• a width of the teeth;
• TG:
• a width of a teeth tip end;
• and
• TH:
• a width of a slot opening part, the dimensions of the respective elements of the rotor slot and the dimensions of the respective elements of the stator iron core satisfy relations as follows;
• TF/(TG+TH)×TD/2≦TB≦TD/2 Expression 1
• TF/(TG+TH)×TD/2≦TE≦TD/2 Expression 2.