| 摘要 |
<p>The invention relates to a collectorless d.c. machine which is provided with a disc which rotates with the rotor, in which disc magnetically coded tracks are provided which co-operate with magneto-sensitive elements for selectively energizing the stator coils depending on the rotor position. The invention in particular relates to a three-phase motor, whilst on a disc on the rotor shaft two magnetic codes are provided which are shifted through 120.degree. relative to each other. The magnetic codes are separately detected by a magneto-sensitive element. The two elements together with the associated electronic circuitry which amplifies the two signals and produces a third signal which has a 120.degree. phase shift relative to the two other signals, take the form of one integrated circuit.</p> |
