Barrel-shaped claw-pole rotor for induction type AC generator
AssigneeHitachi, Ltd.
InventorsShigeki Yamada, Akira Tokairin
Life of this patent
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Abstract
A rotor for use in an induction type a.c. generator and a method for fabricating the same are disclosed. The rotor comprises pole pieces having pointed ends at their peripheries, the pointed ends of one pole piece and the pointed ends of the other pole piece alternating in position and serving as, alternately, north and south magnetic poles; a core or yoke disposed between the pole pieces to magnetically coupling the pole pieces; an insulating bobbin disposed on the core or yoke and between the pole pieces; and an exciting coil wound on the bobbin cylindrically. The core or yoke is in the shape of a barrel and the insulating bobbin is forcibly mounted on the barrel-shaped core by the application of pressure.
Claims6
A rotor for use in an induction type a.c. generator, comprising
- a rotary shaft;
- a pair of pole pieces attached fixedly to said rotary shaft and each having at least two pointed ends along its periphery so that the pointed ends of said pair of pole pieces become, alternately, north and south poles in use;
- a barrel-shaped core or yoke rigidly fixed to said rotary shaft, interposed closely between said pole pieces to magnetically couple said pole pieces, said barrel-shaped core or yoke having a bulged circumferential surface and flat parallel ends;
- an insulating coil bobbin having a hollow cylindrical portion and flanges extending radially outwardly at the opposite ends of said hollow cylindrical portion, said coil bobbin being disposed between said pole pieces and press-fitted on said bulged circumferential surface of said core or yoke;
- and
- an exiciting coil wound cylindrically on said bobbin.
Dependencies are inferred from the claim text.