| 摘要 |
<p>In a direct current motor without collector provided with a permanent magnet rotor (11), a magnetisation of the rotoric poles (N, S) is used which differs considerably from the sinusoidal form. In addition to the main winding (35-47) used for driving the motor, the stator is further provided with a detection winding (80) arranged so as to detect a harmonic of the voltage induced in the stator by the rotoric poles (11), for example the second harmonic. The detection winding (80) is preferably wound in the same statoric notches as the main winding, and to avoid an inductive coupling between the main winding (35-47) and the detection winding (80), a predetermined space phase shift is maintained between these two windings. </p> |
