Patent ID: 6707180
Filing Date: 2004-03-16
Classification: H02K

Abstract:
A cooling method for a rotation object having a rotation axis and an inner space, the inner space having a coolant inlet which is located on the rotation axis and a coolant outlet which is located on the rotation axis, the coolant inlet and the coolant outlet facing each other, the cooling method comprising:generating a main-stream of the coolant in a central space of the inner space, the main-stream flowing straightly along the rotation axis from the coolant inlet to the coolant outlet; generating a sub-stream of the coolant in a peripheral space around the central space, the sub-stream circulating in a radial direction of the inner space; and generating a contact between the main-stream and the sub-stream, the contact being attended with a mix of the coolant of the main-stream and the coolant of the sub-stream.