Patent ID: 7737584
Filing Date: 2010-06-15
Classification: H02K,Y10T

Abstract:
1. An electric machine, comprising: a housing; a rotor having a shaft defined by a shaft axis to establish a longitudinal extent of the electric machine; and a cooling circuit for throughflow of a coolant, said cooling circuit having cooling pipes which extend substantially in the longitudinal extent of the electric machine, said cooling circuit having a first distribution pipe constructed in the form of a breached circle and spanning a plane, with the shaft axis extending substantially perpendicular to the plane, said cooling pipes being tightly connectable to the first distribution pipe, wherein the cooling circuit has a first connection, connected to one end of the first distribution pipe, for supply of coolant into the cooling circuit, and a second connection, connected to another end of the first distribution pipe, for discharge of coolant from the cooling circuit, wherein the first distribution pipe is cast in a metal part which is formed with openings at connection points between the first distribution pipe and the cooling pipes for accepting the cooling pipes, said metal part being in thermally conductive connection with the housing, when installed, and/or being part of the housing, wherein each of the cooling pipes has a partition wall along a length thereof to thereby define two channels in each cooling pipe for simultaneous conduction of coolant in opposite directions, and wherein each cooling pipe has deflecting means to divet coolant, which flows away from the first distribution pipe in one of the channels, into the other one of the channels at a distribution-pipe-distal end of the cooling pipe to allow coolant to flow back in the other channel to the first distribution pipe.