Avaliação dos danos no alternador – causas típicas e tipos de danos

Danos por curto-circuito / inversão da polaridade

Danos por curto-circuito / Inversões da polaridade no alternador podem ser identificadas através de díodos de potências separados ou dessoldados, bobinagem do estator dessoldada e / ou componentes do retificador queimados.

Danos de corrosão

Os danos de corrosão no alternador podem ser identificados através de sinais de forte corrosão nos contactos e nos terminais de conexão.

Alternador coberto de óleo

As infiltrações de óleo dão origem a uma película de óleo na carcaça, nas bobinagens, nos anéis coletores e nas escovas de carvão do alternador. O óleo provoca o amolecimento das escovas de carvão.

Alternador com bomba de vácuo fortemente contaminado com óleo

Em alguns veículos com motor a gasóleo, o vácuo necessário para o servofreio é produzido por uma bomba de vácuo que está montada no alternador. Um dos problemas mais frequentes é a contaminação dos alternadores com óleo e a subsequente avaria.

Corrosion damage

Corrosion damage on the alternator can be detected from severe corrosion on the contacts and terminals.

Causes: Alternators are usually splash-proof as standard. If extreme water ingress occurs when washing the engine with a steam jet, driving through deep puddles, etc., or because there are no splash protection covers, this will result in damage to the alternator.

Effects: Extreme water ingress leads to corrosion at the contacts and terminals, damage to the ball bearings and softening of the carbon brushes. Corroded contacts and terminals cause power drops or lead to no power output. Bearing damage will result in a lot of noise or total failure of the alternator.

Important: Existing splash protection covers must always be refitted when replacing the alternator

Danos nos rolamentos do alternador

Danos nos rolamentos do alternador podem ser identificados através de fortes ruídos de funcionamento, folga radial e axial ou bloqueio do rotor.

Corrosion damage

Corrosion damage on the alternator can be detected from severe corrosion on the contacts and terminals.

Causes: Alternators are usually splash-proof as standard. If extreme water ingress occurs when washing the engine with a steam jet, driving through deep puddles, etc., or because there are no splash protection covers, this will result in damage to the alternator.

Effects: Extreme water ingress leads to corrosion at the contacts and terminals, damage to the ball bearings and softening of the carbon brushes. Corroded contacts and terminals cause power drops or lead to no power output. Bearing damage will result in a lot of noise or total failure of the alternator.

Important: Existing splash protection covers must always be refitted when replacing the alternator

Corrosion damage

Corrosion damage on the alternator can be detected from severe corrosion on the contacts and terminals.

Causes: Alternators are usually splash-proof as standard. If extreme water ingress occurs when washing the engine with a steam jet, driving through deep puddles, etc., or because there are no splash protection covers, this will result in damage to the alternator.

Effects: Extreme water ingress leads to corrosion at the contacts and terminals, damage to the ball bearings and softening of the carbon brushes. Corroded contacts and terminals cause power drops or lead to no power output. Bearing damage will result in a lot of noise or total failure of the alternator.

Important: Existing splash protection covers must always be refitted when replacing the alternator