Direct-current machine having permanent magnet field system.

摘要

Relating to a direct-current machine having a rotor which includes a commutator (2), an armature core (3) and an armature winding and is sustained rotatably in a field system constituted by a cylindrical housing and permanent magnets (8,9) disposed inside the same, the aim of the invention is to reduce a demagnetizing force of an armature reaction due to an armature current by attaching a magnetic plate (10) made of high saturation magnetic flux density material to a part of the pole-face of said field system of permanent magnets (8,9) which is in the demagnetizing field.