NT Series NEMA Standard Three Phase Asynchronous TEFC Cast Iron Motors

Product catalog summary

General Information:
The NT series motors are NEMA standard three-phase asynchronous motors with a Totally Enclosed Fan Cooled (TEFC) design. They are recognized for their high efficiency, low temperature rise, low noise and vibration, high starting torque, and durability. These motors are UL and CSA certified and can be customized for various applications with different designs (A, B, C, D) and specifications such as class H insulation or different voltage and frequency options.

Main Technical Specifications:

Frame Size: 140T - 440T
Rated Power: 1-300HP
Voltage: 230/460V, 460V, or 575 V
Speed: 3600, 1200, 1800 r/m
Poles: 2, 4, 6
Protection Class: IP55 or above
Insulation Class: Class F or above
NPT threaded terminal box
Roller bearings on drive end

NEMA Design Types:

Design A: Normal starting torque, high breakdown torque, suitable for variable speed operation with low slip and high efficiency.
Design B: Similar to Design A but with lower starting current, suitable for variable torque and constant horsepower applications.
Design C: High starting torque, suitable for heavy starting loads with low starting current.
Design D: Highest starting torque, suitable for machinery with high peak loads.

Technical Specifications - Design D:

Motor types are specified with varying rated power, current, speed, power factor, efficiency, locked current, rated torque, and sound levels.
Efficiency ranges from 84.5% to 95.2% depending on the load percentage (50%, 75%, 100%).
Sound levels are measured in dB(A) and vary from 58 to 74 dB(A).
Weight of motors ranges from 221 kg to 1676 kg.

Bearings:

Different frame sizes use specific bearing types, such as 6205 2Z/C3, 6306 2Z/C3, and NU318/C3, among others.
Bearings are categorized by driving end and non-driving end specifications.

Mounting and Dimensions:

Dimensions for foot-mounted motors with single straight-shaft extension are provided for various frame sizes, detailing measurements like A Max, C, D, 2E, 2F, BA, H, N-W, O, R, S, T, U, ES Min, AA, NPT, AB.
Separate dimensions are provided for C face-mounted or footless motors and D face-mounted or footless motors.

Contact Information:
Fuzhou Wonder Electric Co., Ltd. and its subsidiaries in Malaysia and Singapore provide contact details including addresses, emails, telephone, and fax numbers.

Catalog excerpts

NT Series NEMA Standard Three Phase Asynchronous TEFC Cast Iron Motors

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NT Series NEMA Standard Three Phase Asynchronous TEFC Cast Iron General Information: NT series (Inverter Duty) NEMA standard three phase asynchronous motors are Totally Enclosed Fan Cooled motors, designed and manufactured to meet or exceed efficiency values of NEMA MG-1. The motor has the characteristics of high efficiency, low temperature rise, low noise and vibration, high starting torque, solid structure, durability, safety and reliability. Wonder NT Series are UL and CSA certificated. Wonder NEMA standard motors cover optional multiple designs of A, B, C, D, making them suitable for different...

Open the catalog to page 2