Patent ID: 7755230
Filing Date: 2010-07-13
Classification: G01K,H02K

Abstract:
1. A rotary electric machine comprising: a stator with armature windings wound around a stator core; a rotor with field windings wound around a rotor core and placed inside the stator concentrically in a rotatable manner; a stator frame for housing the stator and the rotor; a cooling device for controlling a cooling gas flow; a plurality of gas flow sections axially partitioned between the stator frame and the stator; a measuring device for measuring an ambient temperature of the rotary electric machine; a detecting device for detecting at least one of the an armature voltage or an armature current or a field current; a control means for controlling the cooling gas flow of the cooling device; wherein a directive value of the cooling gas flow is given by the control means; wherein a temperature distribution including a highest temperature value inside the rotary electric machine is calculated by the control means using the measured ambient temperature, at least one of the detection value of the detecting device and the directive value of cooling gas flow, and a new directive value of cooling gas flow is determined by the control means according to the calculated necessary cooling gas flow so that the highest temperature inside the rotary electric machine does not exceed a predetermined limit; and a plurality of cooling devices corresponding to respective gas flow sections; wherein the new directive value of cooling gas flow is determined by the control means for each of the plurality of the cooling devices corresponding to the respective gas flow sections.