The invention relates to a contact disc system comprising a rotatable contact disc (10) and a plurality of contact elements (12, 14, 16, 18), wherein the contact disc (10) has a plurality of contact rails (20, 22), and each contact piece (12, 14, 16, 18) corresponds to a contact rail (20, 22), wherein the contact plate (10) has two contact rails (20, 22), and the Two selected contact pieces (12, 14) of the plurality of contact pieces (12, 14, 16, 18) are always at the same potential and slide on the same rail (20). The invention also relates to a windshield wiper motor and a method for controlling the windshield wiper motor.