| 摘要 |
<p>The rotor of an electronically commutated DC machine, which can be operated as a motor or as a generator, has at least one permanent magnet having at least four poles which are arranged concentrically with respect to the rotor rotation axis, are polarised essentially at right angles to the rotation axis and are arranged adjacent to an annular magnetic return path part. The stator winding is accommodated in the annular gap between the rotor and the magnetic return path part and has a meandering conductor track arrangement, which is produced by moulded windings and whose straight meandering sections, which pass to and fro, consist of a number of parallel conductor sections. A device which detects the angular position of the rotor with respect to the straight meandering sections which pass to and fro supplies signals to a drive electronics device which, for its part, controls the current flow through the conductor track arrangement such that said arrangement in consequence produces a magnetic field which drives the rotor. An electronically commutated DC motor of such construction and having, for example, 40 poles has an extremely constant nominal motor speed and, as a result of the high filling factor in the magnetic gap, produces a high e.m.f. Such a motor can preferably be used as a drive unit in Winchester disk memories.</p> |
