Thermally protected electric machine

H - Electricity – 02 – K

Patent

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Details

H02K 9/00 (2006.01) H02H 5/04 (2006.01) H02H 7/06 (2006.01) H02K 1/02 (2006.01) H02K 11/00 (2006.01)

Patent

CA 2397635

An electric machine including a magnetic component, forming part of its rotor or stator that loses its magnetic characteristics above a certain chosen temperature is disclosed. This magnetic material forms part of a magnetic circuit that guides flux about the stator. As a result, any magnetic flux emanating with the rotor stops circulating about the stator above this temperature, and the machine stops acting as generator. The component is thermally coupled to windings carrying current from the machine's stator. The material forming the component is selected so that the chosen temperature is lower than the temperature at which the machine would be thermally damaged. This, in turn, limits the operating temperature of the windings, and thus prevents overheating of the machine during operation, typically caused by a fault. Preferably this magnetic material is formed from a ferrite material, such as a Manganese Zinc ferrite material.

L'invention concerne une machine électrique comprenant un composant magnétique, qui forme une partie du rotor ou du stator de ladite machine, ce composant perdant ces caractéristiques magnétiques au-dessus d'une certaine température choisie. Ce matériau magnétique forme une partie du circuit magnétique qui guide un flux magnétique autour du stator. En conséquence, tout flux magnétique émanant du rotor arrête de circuler autour du stator au-dessus de cette température, et la machine arrête de fonctionner comme un générateur. Le composant est thermiquement couplé aux enroulements qui transportent un courant à partir du stator de la machine. Le matériau formant le composant est sélectionné de sorte que la température choisie soit inférieure à la température à laquelle la machine serait thermiquement endommagée. Ceci, à son tour, limite la température de fonctionnement des enroulements, et donc empêche la surchauffe de ladite machine pendant son fonctionnement, cette surchauffe étant généralement provoquée par une faute. Le matériau magnétique est, de préférence, formé à partir d'un matériau de ferrite, tel qu'un matériau de ferrite de manganèse-zinc.

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