NEMA MG 1-2011 Information Manual
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Contents
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Condensed MG 1-2011Page ii© 2014 National Electrical Manufacturers Association8.5 Grounding Means for Field Wiring .................................................................................... 109 TESTS AND PERFORMANCE—AC SMALL AND MEDIUM MOTORS ...................................... 109.1 Routine Tests for Polyphase Medium Induction Motors .................................................... 109.2 High-Potential Test Voltages for Induction Motors [MG 1-12.3] ........................................ 109.3 Test Methods ..................................................................................................................... 119.4 Performance Characteristics ............................................................................................. 119.5 Torque Characteristics of Single-Phase General-Purpose Induction Motors .................... 119.5.1 Breakdown Torque of Single-Phase Motors......................................................... 119.5.2 Locked-Rotor Torque of Single-Phase Small Motors ........................................... 119.5.3 Locked-Rotor Torque of Single-Phase Medium Motors ....................................... 119.5.4 Pull-Up Torque of Single-Phase Medium Motors ................................................. 119.6 Locked-Rotor Current Characteristics of Single-Phase and Polyphase General-PurposeInduction Motors ................................................................................................................ 119.6.1 Locked-Rotor Current of Single-Phase Small Motors, Designs N, O,and GeneralPurpose. ............................................................................................................... 119.6.2 Locked-Rotor Current of Single-Phase Medium Motors, Designs L and M ......... 119.6.3 Locked-Rotor Current of 3-Phase 60-Hertz Small and Medium Squirrel-CageInduction Motors Rated at 230 Volts ..................................................................... 129.7 Torque Characteristics of Polyphase General-Purpose Induction Motors ........................ 129.7.1 Breakdown Torque Characteristics of Polyphase Small Motors .......................... 129.7.2 Locked-Rotor Torque of Single-Speed Polyphase Squirrel-Cage Medium Motorswith Continuous Rating......................................................................................... 129.7.3 Breakdown Torque of Single-Speed Polyphase Squirrel-Cage Medium Motorswith Continuous Ratings ....................................................................................... 129.7.4 Pull-Up Torque of Single-Speed Polyphase Squirrel-Cage Medium Motors withContinuous Ratings .............................................................................................. 129.8 Temperature Rise for Small and Medium Single-Phase and Polyphase InductionMotors................................................................................................................................ 129.9 Variations from Rated Voltage and Rated Frequency ....................................................... 139.9.1 Running ................................................................................................................ 139.9.2 Starting ................................................................................................................. 139.10 Voltage Unbalance ............................................................................................................ 139.11 Variation from Rated Speed .............................................................................................. 139.12 Variation from Nameplate Amperes—Alternating-Current Medium Motors ...................... 139.13 Occasional Excess Current ............................................................................................... 139.14 Stall Time .......................................................................................................................... 149.15 Service Factor of Alternating-Current Motors .................................................................... 149.15.1 General-Purpose Alternating-Current Motors of the Open Type .......................... 149.16 Overspeeds for Squirrel-Cage Motors............................................................................... 149.16.1 General Purpose Squirrel-Cage Induction Motors ............................................... 149.16.2 General-Purpose Design A and B Direct-Coupled Squirrel-Cage InductionMotors ................................................................................................................ 149.17 Machine Sound (Medium Induction Motors) ...................................................................... 159.17.1 General ................................................................................................................ 159.17.2 Sound Measurement ............................................................................................ 159.17.3 Sound Power Levels of Polyphase Squirrel-Cage Induction Motors at No Load . 159.17.4 Sound Power Levels of Polyphase Squirrel-Cage Induction Motors at RatedLoad ................................................................................................................ 15 |
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