Patent US3624441A successfully refreshed from Google Patents.
US3624441A
Expired / Lapsed
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Field frame assembly for direct current dynamoelectric machines
Assignee: Motors Liquidation Co
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Filing: 1970-06-10
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Granted: 1971-11-30
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Expires: 1990-06-10
Abstract
Abstract A field frame assembly for a DC motor which includes two end frames joined with a field member. The field member cross section has a serpentine configuration providing integral salient poles and an undulating exterior contour. A field coil is secured in a fixed relation to the salient poles and the field member provides a substantially constant cross section path for flux emanating from the field coil. The end frames afford mounting means for the DC motor and bearing support for the motor''s rotor.
Inventors
- 👤 Max E Todd
- 👤 John V Hellmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:41
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/146; H02K1/148
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A field assembly, comprising: a unitary cylindrical direct current dynamoelectric machine field member comprised of magnetic material having substantially planar end faces located normal to the longitudinal axis of said field member, said field member having an undulating exterior and an undulating interior defining a serpentine configuration providing a plurality of integral salient poles projecting radially inward and extending axially the entire length of said field member, said integral poles having axially extending sidewalls extending the entire length of said field member, each of said integral poles defined by an arcuate pole face intersecting substantially perpendicularly said sidewalls and said planar end faces, a field coil disposed about said integral poles, and means for retaining said field coil in a fixed relation to said integral salient poles.
Claim 2
Dependent Claim
127 words
A field assembly, comprising: a unitary cylindrical direct current dynamoelectric machine field member comprised of magnetic material having substantially planar end faces located normal to the longitudinal axis of said field member, said field member having an undulating exterior and an undulating interior defining a serpentine configuration providing a plurality of integral salient poles projecting radially inward and extending axially the entire length of said field member, said integral poles having axially extending sidewalls extending the entire length of said field member, each of said integral poles defined by an arcuate pole face intersecting substantially perpendicularly said sidewalls and said planar end faces, a field coil disposed about said integral poles, and means for retaining said field coil in a fixed relation to said integral salient poles.
Claim 3
Dependent Claim
197 words
A field assembly, comprising: a unitary cylindrical direct current dynamoelectric machine field member comprised of magnetic material having substantially planar end faces located normal to the longitudinal axis of said field member, said field member having an undulating exterior and an undulating interior defining a serpentine configuration providing a plurality of integral salient poles projecting radially inward and extending axially the entire length of said field member, said integral poles having axially extending sidewalls extending the entire length of said field member, each of said integral poles defined by an arcuate pole face intersecting substantially perpendicularly said sidewalls and said planar end faces, a field coil disposed about said integral poles, means for retaining said field coil in a fixed relation to said integral salient poles, first and second end frames, each of said end frames having a material thickness substantially less than the radial material thickness of said field member, said field member having end portions contoured to telescope respectively into said end frames, said end frames abutting the land portions defining said contoured portions of said field member, and means for securing each of said end frames respectively to one end of said field member.
Claim 4
Dependent Claim
197 words
A field assembly, comprising: a unitary cylindrical direct current dynamoelectric machine field member comprised of magnetic material having substantially planar end faces located normal to the longitudinal axis of said field member, said field member having an undulating exterior and an undulating interior defining a serpentine configuration providing a plurality of integral salient poles projecting radially inward and extending axially the entire length of said field member, said integral poles having axially extending sidewalls extending the entire length of said field member, each of said integral poles defined by an arcuate pole face intersecting substantially perpendicularly said sidewalls and said planar end faces, a field coil disposed about said integral poles, means for retaining said field coil in a fixed relation to said integral salient poles, first and second end frames, each of said end frames having a material thickness substantially less than the radial material thickness of said field member, said field member having end portions contoured to telescope respectively into said end frames, said end frames abutting the land portions defining said contoured portions of said field member, and means for securing each of said end frames respectively to one end of said field member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |