Auxiliary starting switched reluctance motor

H - Electricity – 02 – K

Patent

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Details

H02K 19/06 (2006.01) H02K 19/10 (2006.01) H02K 29/03 (2006.01) H02P 1/16 (2006.01) H02K 3/28 (2006.01) H02P 6/20 (2006.01)

Patent

CA 2151532

A dynamo-electric machine such as a switched reluctance motor (10) having an auxiliary starting capability is disclosed. A stator (14) has a central bore (16) and a plurality of inwardly salient poles (18A-18D) extending into the bore. A rotor (22) is mounted on a shaft (24) for rotation relative to the stator. The rotor has a plurality of outwardly salient poles (26A, 26B) extending into the bore. Stator windings (20, 21) are bifilar windings which produce an electro-magnetic field when a phase is energized. The bifilar windings return energy to the voltage source when the phase is de-energized. An auxiliary winding (28) is also installed on the stator. The auxiliary winding is energized, when the machine is off, to produce a magnetic field which causes rotation of the rotor to a preferred aligned position relative to the stator poles. This facilitates subsequent starting of the machine. An electrical circuit (30) energizes the auxiliary winding, when the machine is off; and then energizes the stator windings when the machine is started. The circuit de-energizes the auxiliary winding when the stator windings are energized. The auxiliary windings are also effective when used with motors having a stepped air gap (G) between the stator poles and rotor poles, or when the stator has a shifted pole configuration.

Cette invention concerne une machine dynamo-électrique telle qu'un moteur à réluctance variable (10) à capacité de démarrage auxiliaire. Elle comprend un stator (14) définissant alésage central (16) et ayant plusieurs pôles saillants (18A-18D) orientés vers le centre de l'alésage. Elle comprend aussi un rotor (22) monté sur un arbre (24) et tournant à l'intérieur du stator. Le rotor a plusieurs pôles saillants (26A, 26B) orientés vers l'extérieur. Les enroulements statoriques (20, 21) sont bifilaires et produisent un champ électromagnétique lorsqu'une phase est alimentée. Les enroulements bifilaires renvoient de l'énergie à la source de tension lorsqu'une phase n'est plus alimentée. Un enroulement auxiliaire (28) est également prévu sur le stator. Cet enroulement est énergisé, lorsque la machine est arrêtée, pour produire un champ magnétique forçant la rotation du rotor vers une position privilégiée d'alignement sur les pôles statoriques pour faciliter le démarrage ultérieur de la machine. Un circuit électrique (30) énergise l'enroulement auxiliaire lorsque la machine est arrêtée, puis énergise les enroulements statoriques lorsque la machine est démarrée. Les enroulements auxiliaires sont aussi efficaces dans des moteurs à entrefer échelonné (G) entre les pôles statoriques et rotoriques ou lorsque le stator a une configuration à pôles décalés.

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