Monophase a.c. motor particularly for operational currents of higher frequencies

Abstract

Abstract 1,042,225. Electric motors. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Sept. 16, 1964 [Sept. 19, 1963], No. 37832/64. Heading H2A. In a 1 Ph. A.C., e.g. H.F. motor, including a stator 15 having a pair of alternating field poles W1, W2 and two pairs of unidirectional field poles N1, S1, N2, S2, and a rotor 23 having a plurality of conductor set circuits each shortcircuited by a respective rectifier, e.g. semiconductor diode 9, Fig. 16 (not shown), each pair of opposite polarity unidirectional field poles N1, S1 &c. is arranged between successive alternating field poles W1 &c., and the stator also includes a pair of unmagnetized poles L1, L2 whose magnetic circuit is closed via the rotor and each of which is arranged between the opposite poles of the two pairs of unidirectional poles, whilst the number of conductor set circuits equals that of the stator poles and each has a coil span substantially equal to twice the stator pole pitch. The motor operates by the alternating field poles inducing in the rotor circuit conductors 1 currents which are polarized by the rectifiers 9. The stator and/or rotor may be of ferrite, the unidirectional field poles N1 &c. energized by either D.C. windings 19 or permanent magnets, and in a railway application starting is controlled by tappings on the alternating field pole windings 17. The stator may be sealed from the rotor and encapsulated in an oil-filled closed shell.

Inventors

• 👤 Gossel Dieter

Bibliographic Details