Abstract: In a screen wiping apparatus for a vehicle, two or more motorsz of the kind having a commutator, such as d.c. wiper motors, are automatically synchronised by a synchronising means which comprises a wheel coupled to the commutator of each machine, together with a reading device which is coupled to the stator of the machine. The reading device detects the instantaneous angular position of the machine.

Abstract: An electro-dynamic machine in the form of a d.c. motor having a commutator, has an electrical service circuit carried by a printed circuit on which are mounted brush carriers for the carbon brushes engaged with the commutator. The machine has a casing which is closed by an intermediate member, and the electrical service circuit is mounted within a cavity of the intermediate member defined by a peripheral flange of the latter, this flange being directed towards the interior of the machine when the intermediate member is mounted on the motor casing.