Patent ID: 7345384
Filing Date: 2008-03-18
Classification: H02K

Abstract:
1. A linear motor armature comprising an armature winding and a can provided to cover the armature winding and serving to cause a refrigerant to flow around the armature winding to carry out cooling, wherein the can is constituted by a two-layer structure having an inner can and an outer can and includes an inner passage formed between the armature winding and the inner can and an outer passage formed between the inner can and the outer can, both ends of the can have a header provided in such a manner that one of the ends serves as a refrigerant supply port and the other end serves as a refrigerant injection port, and a communicating portion for causing the inner passage and the outer passage to communicate with each other is provided in the vicinity of the refrigerant supply port of the can in such a manner that the refrigerant supplied from the refrigerant supply port branches into the inner passage and the outer passage and thus flows, wherein the refrigerant injection port of the header includes an inner injection piping provided to be connected to the refrigerant injection port for the inner passage and an outer injection piping provided to cover an outside of the inner injection piping and disposed to be connected to the refrigerant injection port for the outer passage, and the refrigerant is injected in a two-layer state and wherein the motor is a linear motor.