NEMA SM 1-2017 Guide to General-Purpose Synchronous Motors without Excited Rotor Windings.pdf

1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA SM 1-2017Guide to General-Purpose Synchronous Motors without Excited Rotor WindingsNEMA Standards Publication SM 1-2017 Guide to General-Purpose Synchronous Motors without Excited Rotor Windings Published by: National Electr

2、ical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2017 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection

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13、 SM 1-2017 Part 1: Referenced Standards and Definitions Part 1, Page i 2017 National Electrical Manufacturers Association CONTENTS Foreword . xi Section I General Standards Applying to All Machines Part 1 Referenced Standards and Definitions 1 1.1 Scope . 1 1.2 Referenced Standards . 1 Definitions .

14、 5 Classification According to Size . 5 1.3 Machine . 5 1.4 Small (Fractional) Machine 5 1.5 Medium (Integral) Machine 5 1.6 Large Machine . 5 Classification According to Application 6 1.7 General-Purpose Motor . 6 1.8 Industrial Small Motor 6 1.9 Definite-Purpose Motor 6 1.10 Special-Purpose Motor

15、6 Classification According to Electrical Type 6 1.11 General 6 1.11.1 Electric Motor . 6 1.12 Electric Machines 6 1.12.1 Synchronous Motor . 6 1.12.2 Permanent Magnet Synchronous Motor 6 1.12.3 Line-Start Permanent Magnet Synchronous Motor (LSPM) 7 1.13 Design Letters of Line-Start Permanent Magnet

16、Synchronous Medium Motors . 7 1.13.1 Design MA . 7 1.13.2 Design MB . 7 Classification According to Environmental Protection and Methods of Cooling 7 1.14 Open Machine (IP00, IC01) . 7 1.14.1 Drip-Proof Machine (IP12, IC01) . 7 1.14.2 Splash-Proof Machine (IP13, IC01) . 7 1.14.3 Semi-Guarded Machine

17、 (IC01) . 7 1.14.4 Guarded Machine (IC01) . 8 1.14.5 Drip-Proof Guarded Machine (IC01) . 10 1.14.6 Open Independently Ventilated Machine (IC06) . 10 1.14.7 Open Pipe-Ventilated Machine 10 1.15 Weather-Protected Machine 10 1.15.1 Type I (IC01) 10 1.15.2 Type II (IC01) . 10 1.16 Totally Enclosed Machi

18、ne 10 1.16.1 Totally Enclosed Nonventilated Machine (IC410) . 10 1.16.2 Totally Enclosed Fan-Cooled Machine 10 1.16.3 Totally Enclosed Fan-Cooled Guarded Machine (IC411) . 11 1.16.4 Totally Enclosed Pipe-Ventilated Machine (IP44) . 11 1.16.5 Totally Enclosed Water-Cooled Machine (IP54) . 11 1.16.6 W

19、ater-Proof Machine (IP55) 11 1.16.7 Totally Enclosed Air-to-Water-Cooled Machine (IP54) . 11 1.16.8 Totally Enclosed Air-to-Air-Cooled Machine (IP54) . 11 1.16.9 Totally Enclosed Air-Over Machine (IP54, IC417) 11 1.16.10 Explosion-Proof Machine. 12 1.16.11 Dust-Ignition-Proof Machine 12 1.17 Machine

20、 with Moisture-Resistant, Encapsulated, or Sealed Windings . 12 1.17.1 Machine with Moisture-Resistant Windings . 12 NEMA SM 1-2017 Part 1, Page ii Part 1: Referenced Standards and Definitions 2017 National Electrical Manufacturers Association 1.17.2 Machine with Encapsulated Windings . 12 1.17.3 Ma

21、chine with Sealed Windings . 12 Classification According to Variability of Speed 12 1.18 Constant-Speed Motor 12 1.19 Adjustable-Speed Motor 13 1.20 Base Speed of an Adjustable-Speed Motor 13 Rating, Performance, and Test 13 1.21 Rating of a Machine . 13 1.21.1 Continuous Rating . 13 1.21.2 Short-Ti

22、me Rating . 13 1.22 Efficiency . 13 1.22.1 General 13 1.23 Service Factor 13 1.24 EMF Definitions . 13 1.24.1 Back EMF 13 1.24.2 Voltage Constant . 13 1.25 Full-Load Torque . 14 1.26 Cogging Torque . 14 1.27 Torque Ripple 14 1.28 Locked-Rotor Torque (Static Torque) 14 1.29 Pull-up Torque . 14 1.30 P

23、ull-out Torque 14 1.31 Pull-in Torque 14 1.32 Locked-Rotor Current 14 1.33 No-Load Current 14 1.34 Demagnetization Current . 14 1.35 Temperature Tests 15 1.36 Ambient Temperature 15 1.37 High-Potential Tests 15 1.38 Radial Magnetic Pull and Axial Centering Force . 15 1.38.1 Radial Magnetic Pull 15 1

24、.38.2 Axial Centering Force 15 1.39 Equivalent Circuits . 15 1.39.1 Polyphase Line-Start Permanent Magnet Machine . 15 1.39.2 Polyphase Permanent Magnet Machine . 15 1.39.3 Definitions (See Figure 1-4). 16 1.40 Electromagnetic Compatibility (EMC) 17 1.40.1 Electrical Noise 17 1.41 Electrical Noise I

25、mmunity 17 1.42 Electromagnetic Interference (EMI) . 17 Complete Machines and Parts 17 1.43 Face- and Flange-Mounting 17 1.43.1 Type C Face 17 1.43.2 Type D Flange . 17 1.43.3 Type P Flange . 17 Classification of Insulation Systems 17 1.44 Insulation System 17 1.44.1 Coil Insulation with Its Accesso

26、ries . 17 1.44.2 Connection and Winding Support Insulation . 18 1.44.3 Associated Structural Parts . 18 1.45 Classification of Insulation Systems 18 Miscellaneous . 19 1.46 Nameplate Marking . 19 1.46.1 Nameplate . 19 1.46.2 Additional Nameplate Markings . 19 NEMA SM 1-2017 Part 1: Referenced Standa

27、rds and Definitions Part 1, Page iii 2017 National Electrical Manufacturers Association 1.47 Code Letter 19 1.48 Thermal Protector 19 1.49 Thermally Protected 20 1.50 Over Temperature Protection 20 1.51 Constant Flux. 20 1.52 Deviation Factor 20 1.53 Marking Abbreviations for Machines . 20 General S

28、tandards Applying to Polyphase Permanent Magnet Synchronous Alternating-Current Motors Part 2 Terminal Markings . 1 General 1 2.1 Location of Terminal Markings 1 2.2 Terminal Markings . 1 2.3 Numerals on Terminals of Polyphase Permanent Magnet Synchronous Motors . 2 2.3.1 Polyphase Permanent Magnet

29、Synchronous Motors 2 2.3.2 Definition of Phase Sequence . 2 2.3.3 Phase Sequence . 2 2.3.4 Direction of Rotation 2 Polyphase Permanent Magnet Synchronous Alternating-Current Motors . 3 2.4 General Principles for Terminal Markings for Polyphase Permanent Magnet Synchronous Alternating-Current Motors

30、3 2.4.1 Method of Marking . 3 2.5 Terminal Markings for Three-Phase Single-Speed Permanent Magnet Synchronous Alternating-Current Motors 4 2.5.1 First 4 2.5.2 Second . 4 2.5.3 Third . 4 2.5.4 Fourth 4 2.5.5 Fifth 5 2.5.6 Sixth . 5 2.6 Terminal Markings for y- and Delta-Connected Dual-Voltage Motors.

31、 5 Auxiliary Devices 8 2.7 Terminal Markings . 8 2.7.1 General 8 2.7.2 Auxiliary Terminal Marking Rules 8 2.7.3 Examples of Marking . 9 2.7.4 Auxiliary Devices Within Motor 11 2.7.5 Auxiliary Devices External to Motor . 11 2.7.6 Marking of Rigidly Mounted Terminals 12 General Standards Applying to A

32、ll Machines Part 3 Dimensions, Tolerances, and Mounting 1 3.1 Letter Symbols for Dimension Sheets . 1 3.2 System for Designating Frames 10 3.2.1 Frame Numbers . 10 3.2.2 Frame Letters 12 3.3 Motor Mounting and Terminal Housing Location . 13 3.4 DimensionsAC Machines . 15 3.4.1 Dimensions for Alterna

33、ting-Current Foot-Mounted Machines with Single Straight-Shaft Extension 15 3.4.2 Shaft Extensions and Key Dimensions for Alternating-Current Foot-Mounted Machines with Single Tapered or Double Straight/Tapered Shaft Extension 17 3.4.3 Shaft Extension Diameters and Key Dimensions for Alternating-Curr

34、ent Motors Built in Frames Larger than the 449T Frame . 19 3.4.4 Dimensions for Type C Face-Mounting Foot or Footless Alternating-Current Motors . 19 NEMA SM 1-2017 Part 1, Page iv Part 1: Referenced Standards and Definitions 2017 National Electrical Manufacturers Association 3.4.5 Dimensions for Ty

35、pe FC Face-Mounting for Accessories on End Opposite Drive End of Alternating-Current Motors . 20 3.4.6 Dimensions for Type D Flange-Mounted Footed or Footless Alternating-Current Motors 22 3.5 Tolerance Limits in Dimensions . 23 3.6 Knockout and Clearance Hole Diameter for Machine Terminal Boxes . 2

36、3 3.7 Tolerances on Shaft Extension Diameters and Keyseats . 23 3.7.1 Shaft Extension Diameter 23 3.7.2 Keyseat Width . 23 3.7.3 Bottom of Keyseat to Shaft Surface 24 3.7.4 Parallelism of Keyseats to Shaft Centerline 24 3.7.5 Lateral Displacement of Keyseats . 24 3.7.6 Diameters and Keyseat Dimensio

37、ns . 24 3.7.7 Shaft Runout 24 3.7.8 Shaft Extension Key(s) 27 3.8 Ring Groove Shaft Keyseats for Vertical Shaft Motors . 27 3.9 Method of Measurement of Shaft Runout and of Eccentricity and Face Runout of Mounting Surfaces . 27 3.9.1 Shaft Runout 27 3.9.2 Eccentricity and Face Runout of Mounting Sur

38、faces 27 3.10 Tolerances for Type C Face-Mounting and Type D Flange-Mounting Motors 27 3.11 Tolerances for Type P Flange-Mounted Motors 28 3.12 Mounting Bolts or Studs 28 3.13 Method to Check Coplanarity of Feet of Fully Assembled Motors 29 3.14 Method of Measurement of Shaft Extension Parallelism t

39、o Foot Plane 29 3.15 Measurement of Bearing Temperature . 29 3.16 Terminal Connections for Small Motors 30 3.16.1 Terminal Leads 30 3.16.2 Blade Terminals . 30 3.17 Motor Terminal Housings 30 3.17.1 Small and Medium Motors . 30 3.17.2 Dimensions 30 General Standards Applying to Polyphase Permanent M

40、agnet Synchronous Alternating-Current Motors Part 4 Mechanical VibrationMeasurement, Evaluation, and Limits 1 4.1 Scope . 1 4.2 Object 1 4.3 References 1 4.4 Measurement Quantity 1 4.4.1 Bearing Housing Vibration . 1 4.4.2 Relative Shaft Vibration . 1 4.5 Measuring Equipment 1 4.6 Motor Mounting 1 4

41、.6.1 General 1 4.6.2 Resilient Mounting . 2 4.6.3 Rigid Mounting . 2 4.6.4 Active Environment Determination 3 4.7 Conditions of Measurement . 3 4.7.1 Shaft Key . 3 4.7.2 Measurement Points for Vibration . 3 4.7.3 Operating Conditions . 4 4.7.4 Vibration Transducer Mounting . 6 4.8 Limits of Bearing

42、Housing Vibration 6 4.8.1 General 6 NEMA SM 1-2017 Part 1: Referenced Standards and Definitions Part 1, Page v 2017 National Electrical Manufacturers Association 4.8.2 Axial Vibration 7 4.9 Limits of Relative Shaft Vibration 8 4.9.1 General 8 4.9.2 Shaft Vibration Limits . 8 General Standards Applyi

43、ng to Polyphase Permanent Magnet Synchronous Alternating-Current Motors Part 5 Sound Power Limits and Measurement Procedures 1 5.1 Scope . 1 5.2 General 1 5.3 References 1 5.4 Methods of Measurement 1 5.5 Test Conditions 2 5.5.1 Machine Mounting . 2 5.5.2 Test Operating Conditions . 2 5.6 Sound Powe

44、r Level . 2 5.7 Determination of Sound Pressure Level 3 Section II Small (Fractional) and Medium (Integral) Permanent Magnet Machines Part 6 RatingsAC Small and Medium Permanent Magnet Motors 1 6.1 Scope . 1 6.2 Voltages . 1 6.3 Frequencies . 1 6.3.1 Alternating-Current Motors 1 6.4 Horsepower and S

45、peed Ratings . 2 6.4.1 Small Permanent Magnet Motors 2 6.4.2 Polyphase Medium Permanent Magnet Motors 2 6.5 Time Ratings for Polyphase Permanent Magnet Motors 3 6.6 Code Letters (for Locked-Rotor kVA) 3 6.6.1 Nameplate Marking . 3 6.6.2 Letter Designation . 4 6.6.3 Single-Speed Motors . 4 6.6.4 Broa

46、d- or Dual-Voltage Motors 4 6.6.5 Dual-Frequency Motors . 4 6.6.6 Part-Winding-Start Motors . 4 6.7 Nameplate Temperature Ratings for Permanent Magnet Small Motors . 4 6.8 Nameplate Marking for Permanent Magnet Small Motors 5 6.8.1 Alternating-Current Polyphase Permanent Magnet Motors, Except Those

47、Included in 6.8.2 and 6.8.3 . 5 6.8.2 Permanent Magnet Motors Rated Less than 1/20 Horsepower 5 6.8.3 Motors Intended for Assembly in a Device Having Its Own Markings 6 6.8.4 Motors for Dual Voltage . 6 6.9 Nameplate Marking for Medium Polyphase Permanent Magnet Motors 6 6.9.1 Medium Polyphase Perma

48、nent Magnet Motors 7 Small (Fractional) and Medium (Integral) Motors Part 7 Tests and Performance . 1 7.0 Scope . 1 7.1 High-Potential TestSafety Precautions and Test Procedure . 1 7.2 High-Potential Test Voltages for Permanent Magnet Motors 1 7.3 High-Potential Production Testing of Small Motors .

49、2 7.3.1 Dielectric Test Equipment 2 7.3.2 Evaluation of Insulation Systems by a Dielectric Test . 2 7.4 Repetitive Surge Test for Small and Medium Motors 2 7.5 Mechanical Vibration . 3 7.6 Bearing LossesVertical Pump Motors 3 7.7 Test Methods . 3 NEMA SM 1-2017 Part 1, Page vi Part 1: Referenced Standards and Definitions 2017 National Electrical Manufacturers Association 7.8 Performance Characteristics . 3 7.9 Locked-Rotor Current of Three-Phase Small and Medium Motors . 3 7.9.1 60-Hertz Design MB Motors at 230 Volts 3 7.9.2 50-Hertz Design MB Motors at 380 Volts 4 7.10 I