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NEMA Standard Design D Three-phase Asynchronous Motor

Three-phase induction motors are specified by their electrical design type. NEMA (National Electrical Manufacturers Association) has classified three-phase AC motors into designs A, B, C, and D. A more recent design called E has been added. These designs are suited to particular application classes based on the load requirements typical of each type.

NEMA Standard Design D Three-phase Asynchronous Motor

Three-phase induction motors are specified by their electrical design type. NEMA (National Electrical Manufacturers Association) has classified three-phase AC motors into designs A, B, C, and D. A more recent design called E has been added. These designs are suited to particular application classes based on the load requirements typical of each type.

As a motor operates from no load to full load, its torque varies with speed. The relationship between speed and torque is often shown in a graph called a speed-torque curve. This curve shows the motor’s torque, as a percentage of full-load torque, over the motor’s full-speed range, shown as a percentage of its synchronous speed. NEMA classification is based on the speed-torque curves.

NEMA Design Classes:

NEMA classes categorize electric motors based on a motor’s starting torque and its accelerating load. The four standard NEMA design classes are as follows:

NEMA Class A motors have a maximum 5% slip with a high to medium starting current, usually locked rotor torque and standard breakdown torque. These characteristics make them well-suited for a wide variety of applications, and they are often found powering fans and pumps.

NEMA Class B motors also have a maximum 5% slip and a standard breakdown torque but include a low starting current and a high locked rotor torque. These motors are well suited for various applications that require standard starting torques and are commonly found in HVAC systems where they are used with pumps, blowers, and fans.

NEMA Class C motors have a maximum 5% slip, low starting current, high locked rotor torque, and standard breakdown torque. They work well with conveyors and positive displacement pumps that require a high starting torque and high inertia at startup.

NEMA Class D motors exhibit a maximum 5 to 13% slip with a low starting current and a very high locked rotor torque. Applications that require very high inertia starts, like hoists and cranes, often use Class D motors.

NEMA Standard Class D Three-phase Motor Technical Data:

Type Rated At full load Efficiency Locked Current A under 230/460V Locked Torque Rated Torque % Max Torque Rated Torque %
Speed r/min Current A under Connection Power Factor cosφ
HP KW 230/460/796V 575V 230/460/796V 575V
Synchronous Speed  1200r/min   60Hz
213T 3HP 2.2KW 1110 9.4/4.7/2.71 3.8 2△/△/Y 0.76 79.0 50/25 300 270
215T 5HP 3.7KW 1105 15/7.51/4.34 6.0 2△/△/Y 0.76 82.0 80/40 300 270
254T 7.5HP 5.5KW 1135 20.6/10.3/5.95 8.2 2△/△/Y 0.79 86.5 127/63.5 280 340
256T 10HP 7.5KW 1135 27.2/13.6/7.85 10.9 2△/△/Y 0.79 87.0 162/81 310 270
284T 15HP 11KW 1135 38/19/11 15.2 2△/△/Y 0.85 87.0 232/116 275 300
286T 20HP 15KW 1130 50.4/25.2/14.5 20.1 2△/△/Y 0.85 87.5 290/145 275 280
324T 25HP 18.5KW 1135 60.8/30.4/17.6 24.3 2△/△/Y 0.87 88.5 390/195 310 300
326T 30HP 22KW 1135 74.7/37.3/21.5 29.9 2△/△/Y 0.85 88.5 435/217.5 350 320
365T 40HP 30KW 1130 96.7/48.4/27.9 38.7 2△/△/Y 0.87 89.0 580/290 290 270
404T 50HP 37KW 1130 122/61.2/35.3 48.8 2△/△/Y 0.87 88.0 725/362.5 330 300
405T 60HP 45KW 1130 147/73.4/42.4 58.8 2△/△/Y 0.87 88.0 870/435 340 330
444T 75HP 55KW 1130 178/89.2/51.5 71.2 2△/△/Y 0.90 87.5 1085/542.5 280 270
445T 100HP 75KW 1130 238/119/68.7 95.2 2△/△/Y 0.90 87.5 1670/835 290 270
447T 125HP 90KW 1135 285/142.5/82.3 114 2△/△/Y 0.88 90.0 1824/912 280 270
449T 150HP 110KW 1135 352/176/101.6 141 2△/△/Y 0.87 90.0 2170/1085 275 275

NEMA Standard Class D Three-phase Motor Installation Dimension:

Frame No. Dimensions(inch)
MAX A MAX B C D E 2F G H J N-W O P R S U T MIN V MIN ES AA AB BA
213T 10.5 7.5 18 5.25 4.25 5.5 0.71 0.41 2.4 3.38 10.6 10.4 1.201 0.312 1.375 1.73 3.12 2.41 1 8.5 3.5
215T 9 19.5 7
254T 12.5 10.3 23.5 6.25 5 8.25 0.79 0.53 2.4 4 12. 9 12.6 1.416 0.375 1.625 2.05 3.75 2.91 1-1/2 10.5 4.25
256T 12 25.3 10
284T 14 12.4 26.6 7 5.5 9.5 0.87 0.53 2.8 4.62 14.3 14 1.591 0.5 1.875 2.05 4.38 3.28 1-1/2 11.5 4.75
286T 13.9 28.1 11
324T 16 13.5 29.6 8 6.25 10.5 0.99 0.66 2.8 5.25 16 15.7 1.845 0.5 2.125 2.44 5.00 3.91 2 14.5 5.25
326T 15 31.2 12
365T 17 16 33.5 9 7 12.25 1.102 0.66 3 5.88 18.13 17.5 2.021 0.625 2.44 2.44 5.62 4.28 3 15.0 5.88
404T 20 15.5 36.5 10 8 12.25 1.18 0.81 3.2 7.25 21.1 21.6 2.45 0.75 2.875 2.84 7.00 5.65 3 19 6.62
405T 17 38.1 13.75
444T 22 18.5 41.9 11 9 14.5 1.38 0.81 3.4 8.5 23 23.5 2.88 0.875 3.375 3.47 8.25 6.91 2×3 20 7.5
445T 20.5 44 16.5
447T 22 24 47.4 11 9 20 1.38 0.81 3.4 8.5 23 23.5 2.88 0.875 3.375 3.47 8.5 6.91 2×3 20 7.5
449T 22 31 58 25 1.58 4.25 7.01

NEMA Standard Design D Three-phase Asynchronous Motors (Dedicated for Oil Well Pump)

NEMA Oil Well Pump Motors are single-speed, totally enclosed, self-ventilated, continuous duty, low voltage cage three-phase induction motors that conform to NEMA MG1 design D Standard and have a high slip ratio≥5% and large starting torque. The whole series of motors adopt casting iron frames. The service factor is 1.15. And the motors have obtained Canada CSA Certification.

NEMA Standard Motors Dedicated for Oil Well Pump NEMA Standard Motors Dedicated for Oil Well Pump

Additional information

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Materials Available

1. Stainless Steel: SS201, SS303, SS304, SS316, SS416, SS420
2. Steel:C45(K1045), C46(K1046),C20
3. Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)
4. Bronze: C51000, C52100, C54400, etc
5. Iron: 1213, 12L14,1215
6. Aluminum: Al6061, Al6063
7.OEM according to your request
product materials available

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly
product finishing

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Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

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5. Quality assurance, one year warranty.
6. Supporting professional matched other equipments.
7. The company has more than one product testing units, the implementation of ISO9001: 2015.
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1. The first domestic independent R & D manufacturer and 22 years of professional manufacturing.
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4. Independent research and development, special specifications can be customized.
5. Selected materials, high-tech treatment, up to the international standard test.

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port

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