Importance

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Abstract

In a method for manufacturing a rotor, when “Lm” represents a length of a magnet in an axial direction before a resin material is injected into a magnet housing hole, “Lr” represents a length of a closing portion in the axial direction when the magnet is heated by the resin material in the magnet housing hole and shortened, “α” represents a negative coefficient of linear expansion of the magnet in the axial direction, “β” represents a contraction rate of the resin material, and “ΔT” represents a difference between a temperature of the magnet that is heated by the resin material in the magnet housing hole and shortened and a temperature of the magnet when the resin material is cooled and solidified, the length Lm of the magnet and the length Lr of the closing portion are set to satisfy an inequality Lm·α·ΔT≥(Lr·β)/2.

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First Claim