US676439A - Pole-piece for dynamo-electric machines. - Google Patents
Pole-piece for dynamo-electric machines. Download PDFInfo
- Publication number
- US676439A US676439A US5208701A US1901052087A US676439A US 676439 A US676439 A US 676439A US 5208701 A US5208701 A US 5208701A US 1901052087 A US1901052087 A US 1901052087A US 676439 A US676439 A US 676439A
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- US
- United States
- Prior art keywords
- pole
- piece
- dynamo
- electric machines
- iii
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
Definitions
- I f 'M invention has'relationto theconstruc-' "tion' of pole-pieces, for dynamo-electric mai fchines, and'is designed-to provide ineansfor preventing"orreducingdistortion or the mag netic'field due to cross magnetization of-the rotating armature.
- a or portions thereof extend nearer the periphcry of the armature than'the corresponding portions of adjacent laminae, thus reducing theamountofmetalat the polar tacev of the,
- My invention is also distinguished from the prior art above referred to in that instead of utilizingthel magnetic resistance of saturated metal "to counteract-the distorting effect of armature cross-magnetization I utilize the re-;
- my'invention consists in a plate or lamina for pole pieces having aconcaved inner or polar'edge bounded by a compound curve whosecent-ral portion is concentric with the axis, of the armature andwhoseend portions are each of a greater radius.
- Figure 1 is a plan view of one of my improved laminae; Fig. 2, a similarview showing 'how the lamina is cut away to receive the heads of the bolts -which secure the pole-piece to its seat',and Fig. 3 is a plan view'of a completed pole-,
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Description
No. 676,439. Patented-lune l8, I90I.
.F. A. MERRICK. POLE PIECE FOR DYNAHO ELECTRIC MACHINES.
(Appli on filed Mar. 20, 1901 I IIIIIIIIIIIIIIIIIIII I III'III III IIIIIIIIIIIIIIIIIIIII f ZIIIIUI II II III III I v llll I "II IIIIII II II I I I II I II II II II III II II II II II II III II I|II| III] II III I I I IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII |||||||I I||IIII||||II||||||I|IIIIIIIIIIIIIIIIIIII I i 4 struction in which counterpartlaminae-musti l ,FRANKJA. MERRIOK,OF JoHNsT owN, PENNSYLVANIA,."AssIeNoR To rHE.
It i lE- mmm i i i s emi ers retentive.s'za ieaaaeanae 1's,19o1. 1
' To allwhomjit mag concern;
, LORAIN, fsT L. COMPANY, OF. PENNSYLVANIA,
Po repee Fo'R DvN Moe ELECTRIC 'M c Hi 4 ESQ f by f uBe itkn'ow-n that I, FRANK A. MERRIGK, of;
Johnstowmin' the county ofCambria and StateofPennsylvania, have invented a new [and useful Improvement in Pole-Pieces for,
Dynamo-Electric Machines,of which thefollowing is a full, clear,-an'd exact description,
tion.
I f 'M invention.has'relationto theconstruc-' "tion' of pole-pieces, for dynamo-electric mai fchines, and'is designed-to provide ineansfor preventing"orreducingdistortion or the mag netic'field due to cross magnetization of-the rotating armature. Y
.For well -known reasonsfpole s pieces" are i usually of laminated construction, audit has I been common prior to my invention to counteract the distorting effe'ct'of cross magnetiz'ation by so shapingand,assembling'the lami nee-that the polar edges of alternate lamina:
, a or portions thereof extend nearer the periphcry of the armature than'the corresponding portions of adjacent laminae, thus reducing theamountofmetalat the polar tacev of the,
" piec'e'or-at the tips thereof,-tothereby produce magnetic saturation or supersaturation I of the metal to; sucha degree that further passage of magnetic linesof force-through those portions-of the poles is. checked, This requires either theuse of two difierent forms of lamina? placed alternately with respect to each other or" else the alternate assembling-of counterpart laminae; The first-named cons struction 'isobjectionable'in that two different diesmust beemployed in the production 7 of the laminae, and care must be taken in assembling, and this last-mentioned objection applies with still greater forceto the con- 7 "be assembled in alternate relation.
'that the end portions of each are also counterparts of each other, so that they may be assembled without regard to end relation.
My invention is also distinguished from the prior art above referred to in that instead of utilizingthel magnetic resistance of saturated metal "to counteract-the distorting effect of armature cross-magnetization I utilize the re-;
sistance of, a'sornewhateincreased airgap between the tip fportions of the poles'andt-he periphery of tlie armature, and thus tend to pr'e'ventsaturationat'snch points. i Specifically'considered, my'invention consists in a plate or lamina for pole pieces having aconcaved inner or polar'edge bounded by a compound curve whosecent-ral portion is concentric with the axis, of the armature andwhoseend portions are each of a greater radius.
In the accompanying drawings, Figure 1 is a plan view of one of my improved laminae; Fig. 2, a similarview showing 'how the lamina is cut away to receive the heads of the bolts -which secure the pole-piece to its seat',and Fig. 3 is a plan view'of a completed pole-,
piece. v
Referring more specifically to Fig. 1, the
centralportion of the concaved edge of the lamina from the point l'to the point 2-has a radius of curvature concentricwith the armaturea xis,.while the curvature of the end por-.
tions 1 3 ison a slightly-greater radius, the
radii of both such portions being from a common' center. The intersection of the curves 1 3 with the'curve'l 2is at the points 1 and 2, as shown. Theextent to which the radii of curvaturejof the end portions 1 3 are increased'will depend somewhat upon the par ticular character of the machine, but is pref= erablyfrom one-eighth to three-sixteenths of an inchl The effect of this increase in radius is, as indicated by thedotted line in r Fig. 1, to gradually increase the width of the air-gap between the armature and the polepiece from the points 1 and 2 outwardly to.
In constructing apole-piece from these I
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US5208701A US676439A (en) | 1901-03-20 | 1901-03-20 | Pole-piece for dynamo-electric machines. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US5208701A US676439A (en) | 1901-03-20 | 1901-03-20 | Pole-piece for dynamo-electric machines. |
Publications (1)
Publication Number | Publication Date |
---|---|
US676439A true US676439A (en) | 1901-06-18 |
Family
ID=2744986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US5208701A Expired - Lifetime US676439A (en) | 1901-03-20 | 1901-03-20 | Pole-piece for dynamo-electric machines. |
Country Status (1)
Country | Link |
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US (1) | US676439A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2745031A (en) * | 1951-05-24 | 1956-05-08 | Siemens Ag | Direct-current machine with compensating pole-face windings |
US20020171317A1 (en) * | 2000-02-25 | 2002-11-21 | Christoph Meyer | Series-wound motor |
US20110068364A1 (en) * | 2009-09-21 | 2011-03-24 | International Business Machines Corporation | Bidirectional electrostatic discharge protection structure for high voltage applications |
-
1901
- 1901-03-20 US US5208701A patent/US676439A/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2745031A (en) * | 1951-05-24 | 1956-05-08 | Siemens Ag | Direct-current machine with compensating pole-face windings |
US20020171317A1 (en) * | 2000-02-25 | 2002-11-21 | Christoph Meyer | Series-wound motor |
US6713929B2 (en) * | 2000-02-25 | 2004-03-30 | C. & E. Fein Gmbh & Co. Kg | Series-wound motor |
US20110068364A1 (en) * | 2009-09-21 | 2011-03-24 | International Business Machines Corporation | Bidirectional electrostatic discharge protection structure for high voltage applications |
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