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YE5 three-phase induction motor

Manufacturer catalogue image · Series illustration

AC induction motors

YE5 three-phase induction motor

Wannan Motor logoWannan MotorView manufacturer →
Power
0.75–375 kW
Voltage
380 V
Supply
380 V / 50 Hz; other configurations by agreement
Cooling
IC411

Catalogue series · Exact configuration and availability confirmed by the manufacturer.

A YE5 retrofit needs a coupling check as well as an efficiency check

Wannan lists both 75 kW two-pole and four-pole motors in frame 280S, but their B3 shaft diameters are different. Their starting-current ratios also remain high despite their published efficiency. For a replacement pump or fan drive, settle speed, coupling and starting capacity before comparing the energy figures.

Same 75 kW and 280S frame, different coupling geometry

Model ratings are at 380 V, 50 Hz; dimensions below are from the B3 foot-mounted drawing. They are not flange dimensions.

Selection detailYE5-280S-2YE5-280S-4
Rated speed 2,985 rpm 1,495 rpm
Rated current 133 A 135 A
Published efficiency 96.5% 96.7%
Shaft diameter D 65 mm 75 mm
Shaft extension E 140 mm 140 mm
Key width F 18 mm 20 mm
Foot-hole spacing A × B 457 × 368 mm 457 × 368 mm
Overall length L 1,080 mm 1,080 mm

The existing starter must handle the replacement’s starting demand

The 75 kW rows both list 8.5 × rated current

Multiplying the catalogue locked-rotor current ratio by rated current gives approximately 1,131 A for YE5-280S-2 and 1,148 A for YE5-280S-4. These are arithmetic estimates from the published ratios at the table conditions, not a measured site-start result. Check source impedance, protective devices and the intended starting method before reusing a starter or specifying a generator.

Starting torque ratio is a separate check

Both 75 kW rows list locked-rotor torque at 1.8 times rated torque and maximum torque at 2.3 times rated torque. Neither ratio describes acceleration time or the full torque–speed curve. Compare the driven equipment’s load and inertia with the motor starting data; do not infer that an efficiency upgrade alone solves a loaded-start problem.

Compare operating hours and actual load, not only an IE label

The table’s 96.5% and 96.7% values refer to different pole-count versions. They are not a savings comparison for the same-speed retrofit. Compare the selected speed and load point with the old motor’s performance, operating hours and tariff. The catalogue markets the range at a high efficiency class, but an order requiring certified efficiency needs documentation for the exact model and applicable test method.

Resolve the mounting code before issuing a replacement order

Keep B3 geometry with the B3 order

For the 280S example, matching 457 × 368 mm feet and 1,080 mm overall length does not remove the 65/75 mm shaft difference. Check the coupling bore and key, shaft height, guards and alignment as a complete assembly. Changing from two poles to four poles also approximately halves speed; it is not a same-duty substitution for a pump or fan.

Do not carry small-frame flange options to large frames

The mounting availability table lists B3, B35 and V1 for frames 315–355, while B5 is not marked as a conventional option there. B14/B34 are shown for the smaller 63–112 group but not the larger groups. Select from the actual frame and mounting combination, then use its own dimension sheet rather than scaling a smaller-frame flange.

State terminal-box side and continuous-duty conditions

The catalogue notes a right-side terminal box as standard unless otherwise agreed. Specify the required position in the order if cable entry or a nearby pipe obstructs it. The overview lists S1 continuous duty, IC411 cooling, class F insulation and IP55 protection; the installed fan ventilation and selected electrical configuration still need to suit the machine’s environment.

CATALOGUE OVERVIEW

About this motor series

Wannan’s YE5 three-phase induction family is published with output ratings from 0.75 to 375 kW and frame sizes 80–355. The collected source states 380 V / 50 Hz, IC411 cooling, IP55 protection and class F insulation, with 2, 4, 6 and 8 pole versions listed. The catalogue presents the series as a high-efficiency industrial motor range. Verify the selected model’s rated speed, mounting and efficiency documentation; the family range does not establish every possible configuration.

Published specifications

Specifications describe a series range; confirm which ratings apply together to the quoted model.

Power
0.75–375 kW
Voltage
380 V
Supply
380 V / 50 Hz; other configurations by agreement
Cooling
IC411
Insulation
Class F
Protection
IP55
Frame Range
80–355
Power Range
0.75–375 kW
Speed
Model dependent
Catalogue Type
Product series

Confirm mounting and shaft dimensions against the drawing for the quoted configuration.

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