Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1978-04-17
1981-04-07
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310254, 310218, H02K 100
Patent
active
042609259
ABSTRACT:
An improved stator for an electromagnetic transducer, such as an alternator, is characterized by a plurality of pole sections joined by a core and configured to increase the space available for stator coil windings and to minimize the length of the winding turns thereof.
In the disclosed embodiment, the core is annular and the pole sections extend inwardly thereof. Each pole section includes a relatively wide base or trunk portion joined at one end with the core and formed at an opposite end into a pair of stator poles. The poles are in an annular array, and the stator is particularly adapted for use with a three-phase alternator. When so used, the stator is provided with three electrically separate winding sections, each of which has a plurality of coils connected in series with alternate coils wound in opposite directions. The coils of each section are alternately positioned around adjacent poles of adjacent pole sections, and around the base of a pole section not otherwise encompassed by a coil of that winding section, and each winding section is angularly displaced around the core relative to each of the other two winding sections.
As a consequence of the configuration of the stator, for a given stator size the number of coil winding turns which may be provided on the stator is increased, yet the length of the turns is decreased so that the resistance of the coils is decreased. This results in an increased capacity for an electromagnetic transducer of a given size.
REFERENCES:
patent: 2124427 (1938-07-01), Morrill et al.
patent: 2827582 (1958-03-01), Krebs
patent: 3217194 (1965-11-01), Terry et al.
patent: 3493800 (1970-02-01), Barrett
patent: 3518473 (1970-06-01), Nordebo
patent: 4038575 (1977-07-01), Nordebo
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