Ordnance Pamphlet 1303 — US Navy Synchros

⚓ Table of Contents

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How Synchros Work

• Introduction: General Description — p. 7
• Synchros Are Self-Synchronizing — p. 10
• Fundamentals: How DC Voltages Can Be Used to Position a Shaft — p. 12
• The Effect of Using AC Voltages — p. 17
• Synchro Motors and Generators: Construction — p. 22
• The Operation of Synchro Motors and Generators — p. 26

Operation of a Complete Synchro System

• Fundamentals — p. 35
• How a Synchro Motor Follows a Generator — p. 38
• How the Currents Depend on Shaft Positions — p. 41
• The Torque Produced by a Synchro Motor — p. 44
• Using One Generator to Drive a Number of Motors — p. 47
• Factors That Affect the Accuracy of a Synchro System — p. 49
• Making a Synchro Motor Turn Backwards — p. 50
• The Bearing-Mounted Synchro Motor — p. 51

How a Synchro Differential Works

• A Mechanical Differential — p. 53
• The Construction of a Synchro Differential — p. 55
• How a Synchro Differential Works — p. 56
• To Reverse the Effect of a Differential's Shaft — p. 60
• Rules for a Differential with Various Connections — p. 61
• A Synchro Differential as Generator or Motor — p. 62
• A Differential's Rotor and Stator Leads Aren't Interchangeable — p. 63

How a Synchro Control Transformer Works

• The Construction of a Synchro Control Transformer — p. 65
• The Operation of a Synchro Control Transformer — p. 67
• Using a Differential Generator as a Control Transformer — p. 72

How Synchro Capacitors ("Exciters") Are Used

• The AC Current Drawn by a Coil — p. 73
• The Use of a Capacitor to Cancel the Magnetizing Current — p. 74
• The Use of Capacitors With a Control Transformer — p. 75
• The Use of Capacitors With a Synchro Differential — p. 77
• General Notes Concerning Synchro Capacitors — p. 78
• Using a Capacitor to Reduce the Line Current — p. 79

Overload and Blown Fuse Indicators

• Overload Indicators — p. 80
• Blown Fuse Indicators — p. 82

Characteristics of Navy Standard Synchros

• The Meaning of Synchro Nameplate Markings — p. 85
• Available Types of Synchros — p. 88
• Tables of Synchro Characteristics — p. 89
• Notes on Navy Standard Synchro Units — p. 97

Standard Connections for Navy Synchros

• Definition of an "Increasing Reading" — p. 101
• Standard Wire Designations — p. 102
• Two Speed Systems — p. 102
• Standard Voltages — p. 103
• Standard Generator & Motor Connections — p. 104
• Standard Connections for Differential Generators & Motors — p. 105
• Standard Connections for Control Transformers — p. 106
• Standard Connections for Synchro Capacitors — p. 107
• Standard Connections for Servo Amplifiers & Motors — p. 107
• The Standard Connections for a Typical Servo System — p. 109

Zeroing Synchros

• Introduction: Electrical Zero as a Reference — p. 111
• To Zero a Synchro Motor — p. 112
• To Zero a Bearing-Mounted Synchro Motor — p. 113
• To Zero a Synchro Generator — p. 115
• To Zero a Differential Motor — p. 118
• To Zero a Differential Generator — p. 120
• To Zero a Control Transformer — p. 123

Maintenance of Synchros

• Repairing Defective Synchros: General Rules — p. 125
• Lubricating a Synchro — p. 126
• Finding Trouble in a Synchro System — p. 127
• Oscillation and Spinning in Synchro Systems — p. 137

Interior Communication Self-Synchronous Units

• General Description — p. 141
• Electrical Zero Setting — p. 144
• Trouble Shooting — p. 146
• Maintenance — p. 147
• Characteristics of Bureau of Ships Self-Synchronous Units — p. 148
• The Interchangeability of Bu-Ships Units — p. 152

Appendix

• A Geometrical Way of Showing Voltage Relationships — p. 155
• The Step-by-Step System — p. 157
• Step-by-Step to Synchro Converters — p. 161
• Index — p. 163