<p>A DC machine with a brush of which the commutation characteristics are improved and the lifetime is prolonged. As shown on Fig. 2, a reduced flux density portion is formed in the pole section of an anisotropic bond magnet. Since the reduced flux density portion located in the pole section is formed at such a position that the absolute value of density of flux penetrating a commutation coil increases due to influence of the reduced flux density portion when the commutation coil moves through the pole section, a reverse voltage can be induced in the commutation coil in the direction of a reversed current during commutation period. Since commutation characteristics can be improved by accelerating reversion of current and compensating for commutation deficiency, generation of spark can be prevented at the time of ending commutation.</p>
