The inner extensions serve as connectors to the outer end of which the windings of the armature or rotor. A tool for undercutting the. Full text of 'Armature winding and motor repair; practical information and data covering winding and reconnectig procedure for direct and alternating current machines. Robot Check. Enter the characters you see below. Sorry, we just need to make sure you're not a robot. For best results, please make sure your browser is accepting cookies. On the contrary, it is a compilation of practical. In this work the writer has. Such an engineer is one who in. The. main difference between the designer and the repairman is. A capable repairman combines both. It is from just this viewpoint that the infor- . That is, instead of discussing. Then for. each individual operation or procedure the applications of. Considerable. repetition of some details of similar methods will therefore be. This has been considered advisable since. Special acknowl- . A. Mclntire, editor of the Electric. Journal, for permission to make liberal use of information con- . Journal. This material has been incorporated. Chapters 3, 8, 9 and 1. Dudley, engineer of the. Westinghouse Electric & Manufacturing. Company, the author is also especially grateful for sugges- . This information appears in Chapters 9 and 1. Dudley and. shortly to be published in a valuable treatise on . Knapp in the form of data. To Henry Scheril, formerly a member of. Crocker- Wheeler Company. Credit is also due and is hereby accorded to the elec- . I have found. with great delight, that the treatment of the subjects discussed. While the book will appeal. Since the material presented in this. I dare say is unique in its field, has been ob- . The diagrams are clear and. Theory with mathematical considerations have been. Types of D- C Armature Windings i . Winding Parts and Terms 1 ..'. Armature Conductor or Inductor '..? Winding Element or Section . Winding Pitch or Coil Pitch . Front and Back Pitch. Lap Multiple or Parallel Windings . Formulas for Lap Windings Multiple; Single, Double and. Triple Windings Meaning of the Term Reentrant Multi- . Lap Windings. 2. 1. Best D- C Windings for a Repair Shop to Use . Number of Armature Slots ...'. Voltage between Commutator Segments . Number of Commutator Bars 2. Usual Speeds and Poles of Different Sizes of Generators. Safe Armature Speeds . ALTERNATING- CURRENT WINDINGS. Types of A- C Windings , i . Distributed Windings . Concentrated Windings . Lap and Wave Windings .'. Whole- coiled and Half- coiled Windings . Single- phase and Polyphase Windings ....,.. Coil Pitch ./I' 3. Phase Spread of Winding 3. Two- phase from Four- phase Windings . Three- phase from Six- phase Windings . Wire, Strap and Bar Wound Coils 3. Methods of Laying out and Connecting A- C Windings .. Group Windings Full and Fractional Pitch Windings. Simple Winding Diagram Reconnecting a Winding Simple. Method for Indicating Polarity of Coil Groups Changing Star. Delta Connection A- C Wave Windings - Progressive and. Retrogressive A- C Wave Windings Connections for Coils. Polyphase Windings Double- layer Winding, Lap Con- . Connecting a Chain Winding Other Common. REPAIR SHOP METHODS FOR REWINDING D- C ARMATURES. Dismantling a D- C Armature 5. Winding Data Needed for a Dismantled Armature 5. Removing Old Coils 5. Winding D- C Armatures Having Partially Closed Slots .. Winding a Threaded- in Coil Insulating Lining for Slots. Inserting Coils in the Slots Insulating Overlapping End Con- . Coils Connecting Finish Ends of Coils to Com- . Loop Windings for Small Motors. Railway Type Armature Coils Coil Insulation Insulating. Core of Railway Armatures Inserting the Coils Con- . Dead Coils Hooding and Banding. Requirements of a Lap Winding 1. Commutator Connections for a Wave Winding 1. Locating First Connection to Commutator for a \Vave Winding . Requirements for a Wave Winding 1. Progressive and Retrogressive Wave Windings . Wave Winding with Dead Coils . Lap Windings '..,' l! Lap Windings for D- C Armatures . Lap Windings for A- C Machines '.,- . Wave Windings for D- C Armatures ,; V/'V . Wave Windings for A- C Machines ; ,v. Multiple Wave Windings 1. Use of Equalizer Rings .- . T ../..'.; :' ^ .. TESTING DIRECT- CURRENT ARMATURE WINDINGS. Causes of Short Circuits in an Armature. Test for Short Circuits in an Armature . Testing for Short Circuits and Open Circuits with a Small Trans- . Causes of Open Circuits in an Armature 1. Tests for an Open Circuit in an Armature 1. Cutting Out Injured Coils 1. Causes of Grounds in an Armature 1. Tests for Grounds in an Armature 1. Use of a Bar Magnet and Millivoltrneter to Locate a Reversed. Use of a Compass to Locate a Reversed Armature Coil . Testing Equipment for a Repair Shop . OPERATIONS BEFORE AND AFTER WINDING D- C ARMATURES. Stripping Off an Old Winding 1. Cleaning and Filing Slots 1. Testing Commutator - , , y- .. Making New Coils 1. Forms for Winding Coils f ... Insulation of Core and Slots 1. Testing Out the Winding V: * j y ; v.^ A . Soldering Coil Leads to the Commutator . Hoods for Armatures . Banding Armatures . Seasoning and Grinding a Commutator . Undercutting Mica of a Commutator . Balancing an Armature ., . Relining Split Bearings . INSULATING COILS AND SLOTS FOR D- C AND A- C WINDINGS. Insulation for Armature Coils and Slots . For Mechanical Protection and Electrical Insulation For. High Temperatures and Electrical Insulation For Electrical. Insulation Only. 1. Treated Cloths Pressboards, Fibres and Papers Coil and. Slot Insulation Used in One Large Repair Shop Micarta- . Insulation for Coils Used in 2. Volt and 5. 00- volt D- C Machines. Coil Insulation for Induction Motor Windings . Coil and Slot Insulation Employed by a Large Manufacturer. Insulation of End Connections of Coils .. Phase Insulation When Reconnecting from 2- phase to 3- phase . Mica Insulation for Armature Coils .!; -. Repairing Coils Damaged in Winding Process . Voltage to Use When Testing Coil and Commutator Insulation. Field Coil Insulation . Varnishes and Impregnating Compounds for Coils 1. Characteristics of Insulating Varnishes 1. Solvent Chart for Insulating Varnishes 1. Method for Making Tape from Cotton Cloth . Drying Out Insulation of D- C Generators 1. Drying Out Insulation of Synchronous Motors 1. Drying Out Induction Motors 1. Measuring Insulation Resistance > ;; '; > -. REPAIR SHOP METHODS FOR REWINDING A- C MACHINES. Winding Small Single- phase Motors. Insulating Lining for Slots Winding the Skein Coil Insert- . Skein Coil in Slots Winding for a Repulsion- start Motor. Winding Small Motors by Hand Windings for Odd Fre- . Connections for Main and Starting Windings. Testing Small Induction Motor Windings Windings for. Small Polyphase Induction Motors. Insulation for Slots Basket Coils Winding a 3- phase. Stator with Basket Coils Threaded Diamond Coil Winding. Stator with Diamond Coils. Winding a 2- phase Stator Having Open Slots Testing the. Windings Inserting a New Coil in a Winding Connecting. Coils Points to Consider when Connecting Coils Cleats. Terminals Painting Winding. Squirrel- cage Secondaries Phase- wound Secondaries. Coils for Partially Closed Slots Coils for Open Slots Lap. Wave Connections Insulation of Coils Inserting. Shoved Through Concentric Coils Bar and Connector Wind- . Diamond Coils Double Windings Testing Windings. Large Machines Connecting the Coils Bracing Needed. Heavy Windings. 2. Coils for A- C Turbo- generators Forming the Coils Insula- . Turbo- generator Coils Testing Turbo- generator. Windings Inserting the Coils in a Turbo- generator Bracing. Windings Connecting the Winding Break- down Test. Reversal of One or More Coils or Groups . Open Circuits v . Placing Wrong Number of Coils .,..*. Using an Improper Group Connection . Order in Which Tests Should be Made f; - . Connecting for the Wrong Number of Poles 2. Applying Direct Current and Exploring with a Compass. ADAPTING DIRECT- CURRENT MOTORS TO CHANGED OPERATING CON- . Changes in Speed. Changes in Operating Voltage . Operating a Motor on One- half or Double Voltage . Size of 'Wire for D- C Armature Coils . Operating a Generator as a Motor and Vice Versa . Motor Speed when Reconnecting a D- C Motor Winding Wave. Adjusting the Air Gap on Direct- Current Machines. Change in Brushes when Reconnecting D- C Motor from a Higher. Lower Voltage 2. 43. Rewinding and Reconnecting D- C Armature Windings for a. Change in Voltage 2. Reconnecting a Lap Winding Reconnecting a Wave Winding. Reconnecting Duplex Windings. Diagrams for Different Changes of Connections . Diagrams for Three- phase Motors 2. Use of Table of Connections V?^> ; . Two- phase Diagrams . Meaning of the Term Chord Factor. Phase Insulation V. Reconnecting Motors to Meet New Conditions. Factors which Limit a Change in Number of Poles of an Induction. Cutting Out Coils of an Induction Motor 2. Procedure When Connecting Coils of an Induction Motor. Connecting Pole- phase- groups of a Winding General. Theory on Which Connection Diagrams are Constructed. Determining Number of Poles from Slot Throw of Coils. Typical Circle Diagrams for Connecting Induction Motors. Troubles Resulting from High Mica 3. Remedy for High and Low Bars . Burn- out Between Bars . Plugging a Commutator. Removing Bars and Mica Segments for Repairs . Repairing a Burned Commutator Bar . Replacing a Repaired Commutator Bar . Tightening up a Repaired Commutator . Baking Commutator with Electric Heat . Temporary Cover for Use When Turning Down a Commutator. Refilling a Commutator 3. Boring Out the End of a Commutator , \ ^ . Mica Used in Commutators .. Templet for Making Mica End Rings '. Micanite as a Commutator Insulation . Precautions when Tightening a Commutator. Making Micanite End Rings ' . Test for Oil- saturated Mica in a Commutator . Commutators Hand. Tools for Undercutting Mica of Commutators. Angle at Which Brush is Set. Common Brush Terms . Procedure for Locating Causes of Brush Troubles. Too Low Brush Pressure Incorrect Spacing of Brushes. Brushes Not Operating on Electrical Neutral Incorrect. Thickness of Brushes Using Brushes of Wrong Character- . Causes and Remedies for Flat Spots on Commutator ... Causes and Remedies for Blackening of Commutator . Causes of Heating in a Motor or Generator . Causes and Remedies for Honey- combing of Brush Faces . Causes and Remedies for Brushes Picking up Copper 3. Causes and Remedies for Brushes Chattering .. N ^ 3. 44. Causes and Remedies for Loosening of Brush Shunts .. INSPECTION AND REPAIR OP MOTOR STARTERS, MOTORS AND GEN- . Inspection and Overhauling of. Direct- Current Motor Starters. X 3. 49. Auto- starters for A- C Motors .
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