Elektromotor mit einem magnetischen, toroidförmigen Stator

1,219,841. Electric motors. TRI-TECH Inc. 7 Feb., 1968 [21 Feb., 1967], No. 6155/68. Heading H2A. A dynamo-electric machine comprises a permanent magnet rotor having a length greater than its diameter, and a stator formed of like opposed parts, each part including orificed disc members having salient poles projecting perpendicularly therefrom, the disc members being interfitted to form an arcuate array of salient poles spaced radially from the rotor. The motor shown comprises four discs 10, 11, 12, 13, made of cold rolled steel or pressed powdered iron, having salient poles 10a, 11a 12a, 13a and a plurality of circumferential legs 10, 1-5; 11, 1-5 &c. which intermesh to form an annular structure enclosing a field coil 17 and surrounding a rotor 20, there being also two shading rings 14, 15, of which 14 has lugs 14a, 14b for mounting the motor on a support. In the assembled motor the shaded poles 10a, 13a are located opposite one another and the air gap under the shaded poles is smaller than under the unshaded poles to provide unidirectional starting. A metallic tape 25, Fig. 2, or a casing, is placed around the stator discs to hold them together. In a modification, Fig. 6 (not shown), the discs 10, 11, 12, 13 have continuous circumferential flanges which interfit to form an annular stator structure. In another modification, Fig. 12 (not shown), the stator is divided into two parts with individual coils (317, 417), there being either one common rotor or two separate rotors mounted on the same shaft. In a further modification, Figs. 13, 14 (not shown), the unshaded discs have a plurality of radial extensions (525) and fit inside cupshaped shaded discs, this arrangement providing magnetic circuits of different reluctance for the shaded and unshaded poles. In yet another modification, Figs. 15-19 (not shown), the stator discs are replaced by wedge-shaped members having perpendicular extensions forming the poles, these wedge-shaped members fitting on to the shading rings. In a final modification, Figs. 10, 11 (not shown), the shading rings are omitted and a mechanical one-way direction inhibitor employed.