DC electric starter-generator
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United States of America Patent
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May 15, 2001
Grant Date -
N/A
app pub date -
Sep 17, 1998
filing date -
Sep 17, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides an improved DC electric starter-generator having high starting torque, compact size and weight, increased efficiency and reliability, and being particularly suitable for a starter-generator for aircraft engines but also suitable for other applications. The DC electric starter-generator has a rotor assembly including a rotor core having a cross-sectional silhouette formed by a hub having preferably one of four and six appendages extending radially from the hub. Each appendage includes a flanged formation having an outer edge which is formed to obtain a desired commutation current wave form. The DC electric starter-generator further includes a stator assembly with a plurality of stator slots, each of which include at least two phase windings which are wound in a direction opposite each other to substantially reduce the effects of counter e.m.f. during operation. The DC electric starter-generator also includes a compact, circular ring shaped power module which can be positioned directly adjacent the stator assembly and within the downstream path of the cooling fan.
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