The stator winding bars (12) e.g. of an alternator are fixed to the magnetic circuit (2) by means of teeth (14, 16) fixed on the cylindrical inner surface (44) of said circuit and protruding inwardly therefrom. Successive teeth going circumferentially round the cylindrical surface are alternately long teeth (14) and short teeth (16). The bars are tangentially wedged by wedges (28) driven radially between the bars and the side walls of the short teeth (16). The bars are held radially by plates (30) which are kept in position by means of tapering pins (32) driven tangentially into holes (44) provided in the heads (29) of the long teeth (14).
The present invention is an air gap winding rotating electric machine in which the stator coils are disposed between the stator side magnetic shield and a thin-walled electrically insulating cylinder which surrounds the rotor. The stator coils are prevented from lateral movement by electrically insulating members inserted between adjacent sets of stator coils. In presently existing air gap winding rotating electric machines, these insulating members fit into slots in the magnetic shield; they are difficult to install and frequently become loose, resulting in the loosening of and possibly damage to the stator coils. In the present invention, the magnetic shield has inward projections instead of slots, and insulating members are secured by the use of taper keys, with the result that installation of the insulating members is easy and there is less chance of their coming loose than in presently existing machines, resulting in a more reliable installation of the stator coils.
A dynamoelectric machine includes a stator having teeth fabricated from a non-magnetic material and containing at least one embedded conductor. The teeth are unitary with a back portion that is mounted to a stator back iron. Permeance variations induced by a stator winding mounted on the non-magnetic stator teeth are low which facilitates a reduction of motor noise. Specifically, since the non-magnetic teeth reduce production of permeance variations, changes in air gap forces between the rotor and the stator are decreased.
