US1375007A - Insulated squirrel-cage winding - Google Patents

Insulated squirrel-cage winding Download PDF

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Publication number
US1375007A
US1375007A US296648A US29664819A US1375007A US 1375007 A US1375007 A US 1375007A US 296648 A US296648 A US 296648A US 29664819 A US29664819 A US 29664819A US 1375007 A US1375007 A US 1375007A
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US
United States
Prior art keywords
core
insulated
squirrel
squirrel cage
cage winding
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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
Application number
US296648A
Inventor
Kimble Austin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Regal Beloit America Inc
Original Assignee
Marathon Electric Manufacturing Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Marathon Electric Manufacturing Corp filed Critical Marathon Electric Manufacturing Corp
Priority to US296648A priority Critical patent/US1375007A/en
Application granted granted Critical
Publication of US1375007A publication Critical patent/US1375007A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • H02K17/168—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having single-cage rotors

Definitions

  • Patented 'Apr. 19, 1921 Patented 'Apr. 19, 1921.
  • This invention relates to squirrel cage windings, and rotor' structures and methods of forming same.
  • the main objects of the invention are to provide a squirrel cage rotor of simplified and more unitary character; to provide a simplified and better form of squirrel cage winding; to provide im-' proved means for insulating a squirrel cage winding from the core; to provide such a device adapted for eflicient ventilation; to provide a squirrel cage in place on the core in integral electrodeposit form; and to provide a method for forming and insulating a squirrel cage winding such as specified.
  • Figure 1 is an end view part1 in section, substantially onthe line 11 0 Fig. 2.
  • Fig. 2 is a longitudinal section on the line 22 of Fig. 1.
  • Fig. 3 is an enlarged sectional detail of one of the insulated bars in place in its slot.
  • Fig. 4.- is an enlarged section across one of the core slots after the wax and black lead have been applied and preceding the electrodeposit step of the process.
  • the rotor 1 comprises a laminated core 2 mounted securely on the shaft 3 in any of the numerous approved ways understood in the art.
  • Said core is provided with a squirrel cage, including a peripheral series of bars 4 disposed in core openings or slots 5, and having their corresponding ends joined by rings 6.
  • the squirrel cage is insulated from the core by a layer 7 of suitable dielectric material, preferably japan, which is adapted for ready application in accordance with the scribed.
  • the method of forming the rotor specified is as follows:
  • the assembled slotted core 2 is first coated with wax as shown at 8, so as to protect the same from any electrodeposit of copper directly thereon.
  • the wax is approcess hereinafter deplied by rolling the core in hot wax.
  • Powdered conducting material such for instance as black lead shown at 9, is then applied to such parts of the core as are to receive the electrodeposit which is to form the squirrelcage, for which purpose it may be blown on with an air brush.
  • the black lead is apphed to thelnterior of the slots 5, and to the peripheral zones 10 on the ends of the core connecting said slots, so that when the core is placed in the plating bath and the electrolytic process is started, copper will be deposited as an integral layer, 4 and 6, lining the slots 5 and covering said end zones 10, whereby an integral hollow bar squirrel cage winding is formed in place on the core.
  • the core slots 5 are so formed that when a suflicient thickness of copper has been deposited (say 1/16), there will remain a central opening 11 in each .bar 4 adapted to enhance ventilation.
  • the rotor is heated and the wax 8i-s blown out or otherwise removed, after which the core is placed in a receptacle containing japan which replaces the wax, permeating all the interstices between the core and the electrodeposit.
  • the core is then baked sufficiently to dry and harden the japan 7, whereupon as a result of said process the squirrel cage is thoroughly insulated from the core and is held rigidly in place.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Description

A. KIMBLE.
INSULATED SQUIRREL CAGE WINDING. APPLICATION FILED uAY12.1919.
1,375,007. I i PatenfedApr.19,1921.
UNITED STATES PATENT OFFICE.
AUSTIN KIMBLE, OF WAUSAU, WISCONSIN, ASSIGNOR TO MARATHON ELECTRIC MFG.
COMPANY, OF WAUSAU, WISCONSIN, A CORPORATION OF WISCONSIN.
INSULATED SQU'IRREL-CAGE WINDING.
Specification of Letters Patent. I
Patented 'Apr. 19, 1921.
Application filed May 12, 1919. Serial No. 296,648.
To all whom it may concern:
Be it known that I, AUSTIN KIMBLn, a
' citizen of the United States of America, and
a resident of Wausau, county of Marathon, and State of Wisconsin, have invented certain new and useful lmp'rovements in Insulated Squirrel-Cage Windings, of which the following is a specification.
This invention relates to squirrel cage windings, and rotor' structures and methods of forming same. The main objects of the invention are to provide a squirrel cage rotor of simplified and more unitary character; to provide a simplified and better form of squirrel cage winding; to provide im-' proved means for insulating a squirrel cage winding from the core; to provide such a device adapted for eflicient ventilation; to provide a squirrel cage in place on the core in integral electrodeposit form; and to provide a method for forming and insulating a squirrel cage winding such as specified.
An illustrative embodiment of this invention is shown in the accompanying drawings, in which Figure 1 is an end view part1 in section, substantially onthe line 11 0 Fig. 2.
Fig. 2 is a longitudinal section on the line 22 of Fig. 1.
Fig. 3 is an enlarged sectional detail of one of the insulated bars in place in its slot.
Fig. 4.- is an enlarged section across one of the core slots after the wax and black lead have been applied and preceding the electrodeposit step of the process.
In theconstruction shown in the drawings, the rotor 1 comprises a laminated core 2 mounted securely on the shaft 3 in any of the numerous approved ways understood in the art. Said core is provided with a squirrel cage, including a peripheral series of bars 4 disposed in core openings or slots 5, and having their corresponding ends joined by rings 6. The squirrel cage is insulated from the core by a layer 7 of suitable dielectric material, preferably japan, which is adapted for ready application in accordance with the scribed.
The method of forming the rotor specified is as follows: The assembled slotted core 2 is first coated with wax as shown at 8, so as to protect the same from any electrodeposit of copper directly thereon. The wax is approcess hereinafter deplied by rolling the core in hot wax. Powdered conducting material, such for instance as black lead shown at 9, is then applied to such parts of the core as are to receive the electrodeposit which is to form the squirrelcage, for which purpose it may be blown on with an air brush. The black lead is apphed to thelnterior of the slots 5, and to the peripheral zones 10 on the ends of the core connecting said slots, so that when the core is placed in the plating bath and the electrolytic process is started, copper will be deposited as an integral layer, 4 and 6, lining the slots 5 and covering said end zones 10, whereby an integral hollow bar squirrel cage winding is formed in place on the core.
The core slots 5 are so formed that when a suflicient thickness of copper has been deposited (say 1/16), there will remain a central opening 11 in each .bar 4 adapted to enhance ventilation.
After the squirrel cage 4, 6 is formed, the rotor is heated and the wax 8i-s blown out or otherwise removed, after which the core is placed in a receptacle containing japan which replaces the wax, permeating all the interstices between the core and the electrodeposit. The core is then baked sufficiently to dry and harden the japan 7, whereupon as a result of said process the squirrel cage is thoroughly insulated from the core and is held rigidly in place.
Although but one specific embodiment of this invention is herein shown and described, it is to beunderstood that numerous details of the construction and process set forthmay be altered or omitted without departing from the spirit of this invention as defined by the following claims.
I claim:
1. The method of forming a squirrel cage form of dynamo-electric device, which consists in coating a magnetic core with wax,
sists in coating a magnetic core with Wax, finally applying japan between the core and then applying a coating of conducting mate' the electrodeposit in place of thewax rerial to the core over areas to be occupied by moved. 10 the end rings and bars of the squirrel cage, Signed at Chicago this 9th day of May then applying an electrodeposit of conduct- 1919. ing metal to the coated areas, then heatin the plated core and removing the Wax, ana AUSTIN KIMBLE.
US296648A 1919-05-12 1919-05-12 Insulated squirrel-cage winding Expired - Lifetime US1375007A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422592A (en) * 1943-05-24 1947-06-17 Sigmund Corp Preformed coating for magnetizable core
US3513342A (en) * 1965-02-06 1970-05-19 Todor Sabev Rotor for alternating-current machines
US20030184185A1 (en) * 2002-03-27 2003-10-02 Mitsubishi Denki Kabushiki Kaisha Rotor for synchronous induction motor, manufacturing method and die thereof, and compressor
DE102009011235A1 (en) * 2009-03-02 2010-09-09 Ferenc Horvath Squirrel cage rotor for asynchronous machines with metal coated rotor slots
US20120194027A1 (en) * 2009-06-30 2012-08-02 Joint Stock Company "Technology Smp" Method for increasing the operating efficiency of asynchronous short-circuited electric machines and asynchronous short-circuited electric machines (variants)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422592A (en) * 1943-05-24 1947-06-17 Sigmund Corp Preformed coating for magnetizable core
US3513342A (en) * 1965-02-06 1970-05-19 Todor Sabev Rotor for alternating-current machines
US20030184185A1 (en) * 2002-03-27 2003-10-02 Mitsubishi Denki Kabushiki Kaisha Rotor for synchronous induction motor, manufacturing method and die thereof, and compressor
US6900571B2 (en) * 2002-03-27 2005-05-31 Mitsubishi Denki Kabushiki Kaisha Rotor for synchronous induction motor, including slots and slits, and compressor
DE102009011235A1 (en) * 2009-03-02 2010-09-09 Ferenc Horvath Squirrel cage rotor for asynchronous machines with metal coated rotor slots
US20120194027A1 (en) * 2009-06-30 2012-08-02 Joint Stock Company "Technology Smp" Method for increasing the operating efficiency of asynchronous short-circuited electric machines and asynchronous short-circuited electric machines (variants)

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