Abridgment of a new system of speed control for A-C. motors

The drive unit of this system consists of a constant-speed a-c. motor supplemented by an adjustable-speed d-c. machine of much smaller size. Both rotor and frame of the a-c. motor are mounted on bearings. The d-c. machine is mechanically connected to the frame of the a-c. motor so that the d-c. mach...

Full description

Saved in:
Bibliographic Details
Published inJournal of the A.I.E.E. Vol. 49; no. 11; pp. 930 - 933
Main Author Rossman, A. M.
Format Journal Article
LanguageEnglish
Published The American Institute of Electrical Engineers 01.11.1930
Subjects
Online AccessGet full text
ISSN0095-9804
2376-5976
DOI10.1109/JAIEE.1930.6537010

Cover

Abstract The drive unit of this system consists of a constant-speed a-c. motor supplemented by an adjustable-speed d-c. machine of much smaller size. Both rotor and frame of the a-c. motor are mounted on bearings. The d-c. machine is mechanically connected to the frame of the a-c. motor so that the d-c. machine may drive or be driven by the frame. The d-c. machine is electrically connected through a motor-generator set of equivalent rating, to the source of a-c. energy. The shaft speed of the a-c. motor is increased above the fixed speed by rotating the frame of the a-c. motor in the same direction as the rotor, and it is decreased by rotating the frame in the opposite direction. The direction of rotation and speed are governed by adjusting the voltage impressed on the armature of the d-c. drive machine by the generator of the motor-generator set. When the unit is used to drive fans, the speed range is obtained by a combination of armature voltage control and field control of the d-c. drive machine. This permits a still further reduction in the rating of the d-c. drive machine so that for comparatively wide ranges of speed, it forms but a small percentage of the total drive unit rating. Twenty-four units of this type, aggregating 7020 hp., are now being built for Powerton Power Station for driving forced and induced draft fans. This system of fan drive is being installed in preference to the two-speed squirrel-cage type induction motor system previously used, because it shows large savings in energy, costs little more, and provides a simple method of fan control which permits the adoption of a simplified system of automatic combustion control. The versatility of the system is further illustrated by a description of a 2500-hp. unit of this type designed to drive a high-pressure reciprocating boiler feed pump. During the first seven months of 1930, orders were placed for 35 of these units ranging in size from 166-hp. to 2500-hp., aggregating 16,000 hp. for installation in four different power stations.
AbstractList The drive unit of this system consists of a constant-speed a-c. motor supplemented by an adjustable-speed d-c. machine of much smaller size. Both rotor and frame of the a-c. motor are mounted on bearings. The d-c. machine is mechanically connected to the frame of the a-c. motor so that the d-c. machine may drive or be driven by the frame. The d-c. machine is electrically connected through a motor-generator set of equivalent rating, to the source of a-c. energy. The shaft speed of the a-c. motor is increased above the fixed speed by rotating the frame of the a-c. motor in the same direction as the rotor, and it is decreased by rotating the frame in the opposite direction. The direction of rotation and speed are governed by adjusting the voltage impressed on the armature of the d-c. drive machine by the generator of the motor-generator set. When the unit is used to drive fans, the speed range is obtained by a combination of armature voltage control and field control of the d-c. drive machine. This permits a still further reduction in the rating of the d-c. drive machine so that for comparatively wide ranges of speed, it forms but a small percentage of the total drive unit rating. Twenty-four units of this type, aggregating 7020 hp., are now being built for Powerton Power Station for driving forced and induced draft fans. This system of fan drive is being installed in preference to the two-speed squirrel-cage type induction motor system previously used, because it shows large savings in energy, costs little more, and provides a simple method of fan control which permits the adoption of a simplified system of automatic combustion control. The versatility of the system is further illustrated by a description of a 2500-hp. unit of this type designed to drive a high-pressure reciprocating boiler feed pump. During the first seven months of 1930, orders were placed for 35 of these units ranging in size from 166-hp. to 2500-hp., aggregating 16,000 hp. for installation in four different power stations.
Author Rossman, A. M.
Author_xml – sequence: 1
  givenname: A. M.
  surname: Rossman
  fullname: Rossman, A. M.
  organization: Sargent & Lundy, Inc., Chicago, Illinois
BookMark eNo9kEFOwzAQRS1UJErpBWDjCySM7STOiFUUhVJUiU33URxPUFATV3Yk1NvT0MJq9DX__cW7Z4vRjcTYo4BYCMDn92JbVbFABXGWKg0CbthSKp1FKepswZYAmEaYQ3LH1iF8AZwrWoPKl-ylML63nwONE3cdb_hI3zycwkTDnMORyPLWjZN3B945z4uojPngJufDA7vtmkOg9fWu2P612pdv0e5jsy2LXdRmCiK0QguboWyFVZijyaBDskanpk1QCmmlMSmiQjIkUqna3NomT5pECUJCtWLyMtt6F4Knrj76fmj8qRZQzwLqXwH1LKC-CjhDTxeoJ6J_4O_7A4OlVzE
ContentType Journal Article
DBID AAYXX
CITATION
DOI 10.1109/JAIEE.1930.6537010
DatabaseName CrossRef
DatabaseTitle CrossRef
DatabaseTitleList
DeliveryMethod fulltext_linktorsrc
Discipline Engineering
EISSN 2376-5976
EndPage 933
ExternalDocumentID 10_1109_JAIEE_1930_6537010
6537010
Genre orig-research
GroupedDBID 0R~
6IK
AAFWJ
AAJGR
AAWTH
ABAZT
ABQJQ
ABVLG
ACGFS
AFFNX
AGQYO
AHBIQ
AI.
ALLEH
ALMA_UNASSIGNED_HOLDINGS
BEFXN
BFFAM
BGNUA
BKEBE
BPEOZ
IEQBH
IFIPE
IPLJI
JAVBF
M43
O9-
OCL
RIE
RNS
TN5
VH1
AAYXX
CITATION
ID FETCH-LOGICAL-c630-9d171d692c1d3989b60f9edb75bc49212d2bb59939ebe1523c8dda84a431e9e93
IEDL.DBID RIE
ISSN 0095-9804
IngestDate Tue Jul 01 04:18:03 EDT 2025
Wed Aug 27 02:11:37 EDT 2025
IsPeerReviewed false
IsScholarly false
Issue 11
Language English
License https://ieeexplore.ieee.org/Xplorehelp/downloads/license-information/IEEE.html
https://doi.org/10.15223/policy-029
https://doi.org/10.15223/policy-037
LinkModel DirectLink
MergedId FETCHMERGED-LOGICAL-c630-9d171d692c1d3989b60f9edb75bc49212d2bb59939ebe1523c8dda84a431e9e93
PageCount 4
ParticipantIDs ieee_primary_6537010
crossref_primary_10_1109_JAIEE_1930_6537010
ProviderPackageCode CITATION
AAYXX
PublicationCentury 1900
PublicationDate 1930-Nov.
1930-11-00
PublicationDateYYYYMMDD 1930-11-01
PublicationDate_xml – month: 11
  year: 1930
  text: 1930-Nov.
PublicationDecade 1930
PublicationTitle Journal of the A.I.E.E.
PublicationTitleAbbrev JAIEE
PublicationYear 1930
Publisher The American Institute of Electrical Engineers
Publisher_xml – name: The American Institute of Electrical Engineers
SSID ssj0001077038
Score 1.1483895
Snippet The drive unit of this system consists of a constant-speed a-c. motor supplemented by an adjustable-speed d-c. machine of much smaller size. Both rotor and...
SourceID crossref
ieee
SourceType Index Database
Publisher
StartPage 930
SubjectTerms Boilers
Fans
Generators
Induction motors
Rotors
Shafts
Voltage control
Title Abridgment of a new system of speed control for A-C. motors
URI https://ieeexplore.ieee.org/document/6537010
Volume 49
hasFullText 1
inHoldings 1
isFullTextHit
isPrint
journalDatabaseRights – providerCode: PRVIEE
  databaseName: IEEE/IET Electronic Library
  customDbUrl:
  eissn: 2376-5976
  dateEnd: 19301231
  omitProxy: false
  ssIdentifier: ssj0001077038
  issn: 0095-9804
  databaseCode: RIE
  dateStart: 19240101
  isFulltext: true
  titleUrlDefault: https://ieeexplore.ieee.org/
  providerName: IEEE
link http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwjV07T8MwED4VJhh4FUR5yQMbJLWbxI7FVFVUVaUyFalbFL8WpKbqY-HXc3bSUhADmRIntqzzJffZue8zwCN3XGc8NxGzNo1Spyi-UlZESnvaJB4uiD1P3vjoPR3PslkLnndcGGttSD6zsT8N__JNpTd-qazLs0QEPtWBELLman2vp1CBzlt_eP32gzlNtxwZKrvjPs6dYgQrNG4a-RGH9jZWCXFleAqTbY_qdJKPeLNWsf78Jdb43y6fwUkDMEm_9ohzaNn5BRzvyQ624aUfaFq-JqkcKQlCa1JLOvvr1QIjGmly2AmCWtKPBjHBMa2Wq0uYDl-ng1HUbKIQaZ6g4Q0TzHDZ08wkMpeKUyetUSJTOpUYt0xPqQxBisTRxFie6NyYMk9LBBZWWplcweG8mttrIKXLFMWbyouHMpkqIZxl1LDEGUZL1oGnrUWLRS2VUYQpBpVFsH_h7V80FulA21tr92RTfPN38S0c-co1CfAODtfLjb1HNLBWD8ENvgCzbK7z
linkProvider IEEE
linkToHtml http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwjV07T8MwELaqMgADr4IoTw9skNRuEjsWU1VRldJ2KlK3KH4tSE3Vx8Kv5-ykpSAGMiVOYlnnS-47-747hB6YZSphqQ6oMXEQW0ngkzI8kMrRJuGwPtnzaMz67_Fgmkxr6GnLhTHG-OAzE7pTv5evC7V2S2UtlkTc86n2EvAqeMnW-l5RIRzUt_z1ugKEKYk3LBkiWoMOeE8hwBUSVt38sEQ7pVW8Zekdo9FmTGVAyUe4XslQff5K1_jfQZ-gowpi4k6pE6eoZmZn6HAn8WADPXc8Ucu9iQuLcwzgGpdJnd31cg42DVdR7BhgLe4E3RDDrBaL5Tma9F4m3X5QlVEIFItA9JpyqploK6ojkQrJiBVGS55IFQuwXLotZQIwRcB8gjWPVKp1nsY5QAsjjIguUH1WzMwlwrlNJIGb0qUPpSKWnFtDiaaR1ZTktIkeNxLN5mWyjMw7GURkXv6Zk39WSaSJGk5a2yer5qu_m-_Rfn8yGmbD1_HbNTpwHZWUwBtUXy3W5hawwUreeZX4AhnJskQ
openUrl ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Abridgment+of+a+new+system+of+speed+control+for+A-C.+motors&rft.jtitle=Journal+of+the+A.I.E.E.&rft.au=Rossman%2C+A.+M.&rft.date=1930-11-01&rft.pub=The+American+Institute+of+Electrical+Engineers&rft.issn=0095-9804&rft.volume=49&rft.issue=11&rft.spage=930&rft.epage=933&rft_id=info:doi/10.1109%2FJAIEE.1930.6537010&rft.externalDocID=6537010
thumbnail_l http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/lc.gif&issn=0095-9804&client=summon
thumbnail_m http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/mc.gif&issn=0095-9804&client=summon
thumbnail_s http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/sc.gif&issn=0095-9804&client=summon