YE2 Series Three-Phase Asynchronous Motors

The YE2 series is a range of totally enclosed, self-fan-cooled, squirrel-cage three-phase asynchronous motors covering 0.75 kW to 90 kW across frame centre heights H80 to H280, with 2, 4, 6 and 8 pole options. The series is designed and manufactured to GB/T 28575-2020, the Chinese technical specification for YE2 series three-phase asynchronous motors for frames 80 to 280, and its efficiency performance corresponds to the IE3 class defined in IEC 60034-30-1. Losses and efficiency are determined in accordance with IEC 60034-2-1, and mounting dimensions and power ratings follow IEC 60072-1.

Because a single series covers such a wide range of duties, the practical question for most buyers is not whether YE2 motors are efficient, but which frame, pole count and mounting arrangement fits a given machine. This page sets out the full series range — frame sizes, pole options, model code structure, mounting dimensions and operating conditions — so you can map a load requirement onto a specific YE2 model before requesting a quotation.

Typical driven equipment includes machine tools, fans, triplex plunger pumps, high pressure washing machine, compressors, packaging machinery, conveying machinery, mining machinery and construction machinery. The motors are built with Class F insulation and a temperature rise evaluated to Class B, giving a substantial thermal margin across the whole series, and they are supplied with IP55 enclosure protection as standard.

Key Features

Power range 0.75 kW to 90 kW

• – one series covers fractional and mid-range industrial drives without switching to a second product family.

Frame centre heights H80 to H280

• – frame sizes follow the IEC dimension series, so replacement motors drop onto existing bases.

2, 4, 6 and 8 pole variants

• – synchronise speed with the driven machine instead of over-speeding through a belt or gear reduction.

IE3 efficiency class (IEC 60034-30-1)

• – meets the applicable GB 18613 energy efficiency requirements for small and medium three-phase asynchronous motors.

Class F insulation, Class B temperature rise

• – a large thermal margin for long service life under continuous load.

IP55 enclosure protection

• – dust-tight and protected against water jets for general industrial environments.

Totally enclosed, self-fan-cooled (IC411) squirrel-cage construction

• – no external ventilation ducting required.

Die-cast aluminium rotor

• – high operational reliability with low rotating inertia.

Wide voltage capability

• – 380 V as standard, with any voltage between 220 V and 760 V available.

S1 continuous duty rating

• – rated for uninterrupted operation in fans, pumps and conveying systems.

Model Code & Series Range

Every YE2 model number decodes into the same four fields, which makes a series this wide easy to specify:

Position	Example	Meaning
Series	YE2	High-efficiency three-phase asynchronous motor series
Frame size	132	Frame centre height H132 mm (range H80–H280)
Frame length & variant	M2	Frame length code S / M / L, plus a variant number where two lengths share a centre height
Poles	4	Number of poles: 2, 4, 6 or 8

Worked example — YE2-132M2-4: frame centre height 132 mm, medium frame, second variant, 4-pole. The equivalent 2-pole and 6-pole versions of the same frame are YE2-132S1-2 and YE2-132M2-6, which is why the series publishes separate technical parameter tables for each pole group.

Typical synchronous speeds at 50 Hz and 60 Hz:

Poles	Speed at 50 Hz	Speed at 60 Hz	Typical use
2	3000 r/min	3600 r/min	Fans, pumps, compressors
4	1500 r/min	1800 r/min	General machinery, machine tools,triplex plunger pump
6	1000 r/min	1200 r/min	Conveying machinery, mixers,triplex plunger pump
8	750 r/min	900 r/min	Slow-speed drives, crushers,triplex plunger pump

Specifications

Parameter	Details
Series	YE2 high-efficiency three-phase asynchronous motor
Construction	Totally enclosed, self-fan-cooled, squirrel-cage
Power range	0.75 kW – 90 kW
Frame centre height	H80 – H280
Poles	2, 4, 6, 8
Efficiency class	IE3 (IEC 60034-30-1); complies with GB 18613 energy efficiency requirements
Peak efficiency	Up to 95.2% in the 2-pole range; up to 94.1% in the 6-pole range
Efficiency at 0.75 kW	80.7% (2-pole)
Insulation class	Class F, temperature rise evaluated to Class B; Class H available
Enclosure protection	IP55 (IP54 available)
Cooling method	IC411
Duty type	S1 continuous
Mounting	Foot-mounted and flange-mounted versions to IEC 60072-1
Rotor	Die-cast aluminium

Operating Conditions

Condition	Value
Ambient temperature	-15 °C to +40 °C
Altitude	Not exceeding 1000 m
Rated voltage	380 V; any voltage between 220 V and 760 V available
Rated frequency	50 Hz / 60 Hz
Degree of protection	IP55
Insulation class	Class F, Class H
Cooling method	IC411
Duty type	S1
Connection	Star (Y) for motors rated 3 kW and below; Delta (△) for motors rated 4 kW and above

Mounting Dimensions

Mounting dimensions follow the IEC 60072-1 dimension series, so a YE2 motor can replace an equivalent IEC-frame motor on an existing baseplate. Each frame is published with foot-mounting (B3) and flange-mounting (B5 / B14) dimension sets covering:

Shaft and foot dimensions:

• A (foot hole spacing, axial), B (foot hole spacing, transverse), C (foot hole to shaft shoulder), D (shaft diameter), E (shaft extension length), F (key width), G (key to shaft end), H (frame centre height), K (foot hole diameter)

Overall dimensions:

• AB, AC, AD, HD, HF and L, used for baseplate layout and clearance checks

Flange dimensions:

• M, N, P, S and the flange hole count for flange-mounted variants

Frames covered are H80, H90, H100, H112, H132, H160, H180, H200, H225, H250 and H280, in the 80M, 90S, 90L, 100L, 112M, 132S, 132M, 160M, 160L, 180M, 180L, 200L, 225S, 250M and 280S/280M configurations. Please confirm the mounting code and shaft dimensions against your machine drawing when ordering.

Applications

Machine tools

• – spindle and feed drives where low noise and stable speed matter.

Fans and blowers

• – 2-pole and 4-pole versions for continuous air movement duty.

Water pumps

• – long-term load operation at S1 continuous duty.

Compressors

• – mid-range power ratings with high starting torque demand.

Packaging machinery

• – frequent starts and stops on automated lines.

Conveying machinery

• – 6-pole and 8-pole versions for slow-speed material handling.

Mining and construction machinery

• – high protection class for dusty sites.

General mechanical transmission equipment

• – a drop-in IEC-frame replacement across a wide installed base.

Standards & Compliance

GB/T 28575-2020

• – Technical Specifications for YE2 Series Three-Phase Asynchronous Motors (Frame 80–280)

IEC 60034-30-1

• – efficiency classes for line-operated AC motors; YE2 corresponds to IE3

IEC 60034-2-1

• – methods for determining losses and efficiency of rotating electrical machines

IEC 60072-1

• – dimensions and output series for rotating electrical machines

GB 18613

• – minimum allowable values of energy efficiency and energy efficiency grades for small and medium three-phase asynchronous motors

Ordering & Support

Model selection support:

• share the driven equipment type, required output, speed, duty cycle and mounting arrangement, and we will confirm the YE2 frame and pole count.

Wide voltage options:

• 380 V as standard, with any voltage between 220 V and 760 V supplied to order.

Mounting configuration:

• foot-mounted and flange-mounted versions available; confirm the mounting code before ordering.

Documentation:

• dimensional drawings and technical parameter data for the selected frame available on request.

Application review:

• technical review of load characteristics, starting conditions and ambient environment.

Technical demo:

• request a technical demo and quotation through the enquiry form on this page.

FAQ

Q: What is the power and frame range of the YE2 series?

A: The YE2 series covers 0.75 kW to 90 kW across frame centre heights H80 to H280, with 2, 4, 6 and 8 pole motors in both foot-mounted and flange-mounted configurations.

Q: What efficiency class is a YE2 motor?

A: YE2 motors correspond to the IE3 efficiency class defined in IEC 60034-30-1 and comply with the applicable GB 18613 energy efficiency requirements for small and medium three-phase asynchronous motors. Peak efficiency reaches 95.2% in the 2-pole range and 94.1% in the 6-pole range.

Q: How do I read a YE2 model number such as YE2-132M2-4?

A: The number decodes as series (YE2), frame centre height in mm (132), frame length code with variant (M2) and number of poles (4). The same frame is also built as a 2-pole and a 6-pole version, which is why the technical parameter tables are published by pole group.

Q: What is the enclosure protection and insulation class?

A: Motors are supplied with IP55 enclosure protection (IP54 available) and Class F insulation with temperature rise evaluated to Class B, providing a large thermal margin. Class H insulation is available on request.

Q: What voltages and frequencies are available?

A: 380 V at 50 Hz or 60 Hz is standard. Any voltage between 220 V and 760 V is available, and motors rated 3 kW and below are star-connected while 4 kW and above are delta-connected.

Q: Will a YE2 motor replace an existing IEC-frame motor?

A: Mounting dimensions and power ratings follow IEC 60072-1 and the YE2 frame range mirrors the IEC dimension series from H80 to H280. Confirm the mounting code, shaft dimensions and foot spacing against your machine drawing before ordering.