Chinese Small & Medium Three-Phase Motors in 2026: IE3 / IE4 + PLC Stack

AI Summary

• In China, "small and medium-sized three-phase motor" (中小型三相电机) follows GB 18613-2020, which mandates IE3 as the minimum efficiency level since 2021 and IE4 for many new platforms by 2026.
• Frame sizes, power stacks, and noise/vibration classes are harmonised across Y / Y2 / Y3 / YE3 / YE4 / YE5 series, so cross-brand replacement is now a routine engineering exercise, not a custom build.
• 2026 sourcing reality: most Chinese motor plants pair their IE3/IE4 hardware with a PLC, HMI, or industrial gateway for VFD control — multi-brand BOMs are the default, not the exception.
• KOEED keeps both active production and EOL / legacy motor models stocked, with cross-reference to Allen-Bradley, Siemens, Mitsubishi, Omron, Schneider, Yaskawa, Panasonic, Fanuc, and KEYENCE automation parts.

This 2026 update revisits what "domestic small and medium three-phase motor" actually means under current Chinese standards, frame-size conventions, and PLC-integrated drive architectures.

By KOEED Editorial · 2026-06-30 · 6 min read · Industry News

In 2024 we walked through what "domestic small and medium-sized three-phase motor" means to a Chinese maintenance engineer: the horsepower ladder from 1/4 HP through 5 HP, and the role each rating plays inside a PLC-driven cell. Two years later, the answer has shifted in three ways: the efficiency standard has moved up to GB 18613-2020 (IE3 minimum, IE4 / IE5 default for new builds), the standardisation between Y, Y2, Y3, and YE-series frames is now considered complete, and the typical Chinese motor is no longer standalone — it ships into a VFD + PLC + HMI + gateway stack from day one. This 2026 update revisits the original article, refreshes the horsepower table against current efficiency classes, and adds a sourcing section for the integrated automation parts.

What changed since 2024

Three things changed, and they matter even if you only care about the 1/4 HP / 1/2 HP / 1 HP / 5 HP ladder described in the original article:

Topic in 2024	Topic in 2026
Y / Y2 / Y3 frame naming convention	YE3 / YE4 / YE5 added — IE class is now part of the model code, not just a suffix.
IE2 was common, IE3 emerging	GB 18613-2020 mandates IE3 since 2021; IE4 / IE5 are the new-build default.
DOL start, soft starter emerging	VFD-driven by default (Altivar ATV320 / ATV630, Sinamics V20 / G120, PowerFlex 525 / 755).
PLC control optional, often standalone	PLC + HMI + industrial gateway is the default; OPC UA over TSN / MQTT / Modbus TCP stacked.
HP-only specification	HP + IE class + frame + insulation class + VFD compatibility + EMC class are the five mandatory spec lines.

With that frame, here is the 2026 version of the original article — refreshed against current Chinese standards, restated in PLC-integrated terms, and finished with a sourcing path you can act on.

What "Y, Y2, Y3, YE3, YE4, YE5" actually mean

Chinese small and medium-sized three-phase asynchronous motors follow a frame / series naming pattern that looks cryptic at first but resolves cleanly once you see the layers. The capital Y stands for "asynchronous" (异步), the digits that follow indicate the design generation, and the E prefix marks the energy-efficient class. The current Chinese lineup reads:

Series	IE class equivalent	Status in 2026
Y series	Below IE1 (legacy)	Long obsolete; maintenance-only
Y2 series	IE2 (former minimum)	EOL for new build, still in service
Y3 series	IE2 (frame update)	Phased out; cross-reference to YE3
YE3 series	IE3 (GB 18613-2020 minimum)	Active production baseline
YE4 series	IE4 (premium)	Default for export-grade projects
YE5 series	IE5 (ultra-premium)	Limited vendors, growth segment

The 2026 practical translation: when a Chinese motor datasheet says "YE3-100L-4", you are looking at an IE3, 100-frame centre height, long chassis, 4-pole asynchronous motor. The model code encodes frame size, IE class, and pole count in one string — once you can read it, the cross-reference question reduces to "do I have a compatible Y2 / Y3 spare to swap in, or do I need a fresh YE4 build?".

The 2026 horsepower ladder — refreshed

The 2024 article walked through four sizes (1/4 HP, 1/2 HP, 1 HP, 5 HP). That ladder is still useful as a mental model, but in 2026 each rung carries an IE class, a frame code, and a default drive partner. The updated view:

Power rating	Typical application (2026)	Common frame / IE class	Typical drive partner
1/4 HP (~0.18 kW)	Bench-top mixers, lab stirrers, small fans	YE3-63M / YE4-63M	Sinamics V20, Altivar ATV12
1/2 HP (~0.37 kW)	Packaging conveyors, small pumps, food lines	YE3-71M / YE4-71M	Sinamics V20, PowerFlex 4M, CP1 + VFD kit
1 HP (~0.75 kW)	Conveyor belts, fans, irrigation pumps	YE3-80M / YE4-80M	PowerFlex 525, Altivar ATV320, Sinamics G120
2 HP (~1.5 kW)	Compressors, mixers, HVAC fans	YE3-90S/L / YE4-90S/L	PowerFlex 525, ATV320, Sinamics G120
5 HP (~3.7 kW)	Industrial pumps, large fans, mixers	YE3-100L / YE4-100L	PowerFlex 525 / 755, ATV630, Sinamics G120
10 HP (~7.5 kW)	Heavy conveyors, extruder feeders	YE3-132M / YE4-132M	PowerFlex 755, ATV630, Sinamics G120X

Where the motor meets the PLC: 2026 integration view

In 2024 we framed the motor as a standalone component that "a PLC would start/stop". That framing is now incomplete. By 2026, the typical Chinese small and medium motor is wrapped in a four-block stack:

• VFD / drive — Sinamics V20 / G120 (Siemens), Altivar ATV320 / ATV630 (Schneider), PowerFlex 525 / 755 (Allen-Bradley), Yaskawa GA500 / V1000, Mitsubishi FR-E800 / FR-A800.
• PLC / PAC — SIMATIC S7-1200 / S7-1500, CompactLogix 5380, MELSEC iQ-R / FX5U, Modicon M340 / M580, Omron NX / NJ, Panasonic FP7.
• HMI — SIMATIC KTP / Comfort Panel, PanelView 5000, GOT2000 / GOT3000, Magelis GT / GX, NS / NB Series.
• Industrial gateway / edge — OPC UA / MQTT / Sparkplug B publish to a northbound broker, usually via a SCALANCE / Stratix / MOXA / Hirschmann edge gateway.

Concretely: a 1 HP YE3-80M driving a packaging conveyor on a Chinese food line in 2026 typically pairs with a Sinamics V20 VFD controlled over Modbus RTU by a SIMATIC S7-1200, a KTP700 Basic HMI for local operator panel, and an edge gateway forwarding production counts to an MQTT broker for an upstream MES. The motor is one part of a five-component cell, not a standalone asset.

Sourcing reality in 2026: why a Chinese motor BOM is now a multi-brand job

The 2024 article treated motor sourcing as a single SKU. In 2026 the realistic Chinese maintenance BOM for one motor cell typically contains:

• The motor itself (Chinese YE3 / YE4 / YE5 series, frame and IE class specified)
• The matching VFD, often EU or Japanese make because most Chinese VFD plants still struggle with high-end servo-grade drives
• The PLC, which is usually a brand the customer already standardised on site-wide (AB / Siemens / Mitsubishi / Omron)
• The HMI and edge gateway, again matched to the customer's PLC line
• The spare-parts kit: encoder, braking resistor, line reactor, EMC filter

This is why a multi-brand supplier has become the practical default for Chinese motor projects. A shop that only stocks Chinese motors cannot fulfil the VFD / PLC / HMI line, and a shop that only stocks AB PLCs cannot fulfil the Chinese motor itself. KOEED works across both sides of that line — Chinese small and medium three-phase motors plus the Allen-Bradley, Siemens, Mitsubishi, Omron, Schneider, Yaskawa, Panasonic, Fanuc, and KEYENCE automation parts in one quote.

Migrating a Y2 / Y3 motor cell to YE3 / YE4

For sites still running Y2 / Y3 motors (IE1 / IE2) the migration is mechanical on the motor side but electrical on the VFD / PLC side. A practical sequence:

1. Inventory frame and IE class of every motor in the cell. The frame code (H63 / H71 / H80 / H90 / H100 / H132 / H160) defines the shaft height and foot mounting — that does not change across Y series generations.
2. Match to a YE3 / YE4 equivalent with the same kW, pole count, and mounting (B3 / B5 / B14 / B35). Centre height is preserved.
3. Verify VFD compatibility — newer YE4 motors expect reinforced winding insulation for VFD duty. If the existing drive is an older Sinamics V20 or ATV12, plan a line reactor or dV/dt filter at the same time.
4. Update the PLC / HMI parameters — motor nameplate kW, rated current, and power factor shift between IE2 and IE4. The VFD auto-tune should be re-run after swap.
5. Update documentation and labels — keep the legacy motor in storage as a hot spare for the older drives, but mark it clearly as IE2 / non-VFD-duty.

Sites with a mixed Y / YE fleet typically end up keeping both series in service: Y2 / Y3 motors on DOL or soft-starter circuits, YE3 / YE4 motors on VFDs. The maintenance rule of thumb in 2026 is "if it's on a VFD, it must be YE-class, and the IE class should match the project specification".

Related on the KOEED Blog

• SLC 500 to ControlLogix Migration Guide
• S7-300 to S7-1500 Migration Playbook
• PowerFlex 525 vs 755 — Choosing the Right VFD
• Altivar ATV320 vs ATV630 Sizing Guide
• PLC Error Code Database (Siemens / Mitsubishi / Omron)
• AI Diagnostic Tool — fault diagnosis and obsolete-part cross-reference

Frequently asked questions

What does "domestic small and medium-sized three-phase motor" actually cover in 2026?

In China, the term covers three-phase asynchronous motors from 0.75 kW up to about 375 kW, governed by GB 18613-2020 and the GB/T 28575 series. Frame sizes run from H63 through H315.

Is IE3 really mandatory, or is IE4 the default for new Chinese projects?

IE3 (GB 18613-2020) has been the legal minimum since 1 June 2021, so any motor sold in China for general-purpose industrial use must meet IE3. For new export-grade projects, IE4 is the practical default because IE3 fails EU Tier 2 minimum.

Can I swap a Y2 / Y3 motor for a YE3 / YE4 on the same VFD?

Mechanically, yes — centre height and foot mounting are preserved across Y / Y2 / Y3 / YE3 / YE4. Re-run VFD auto-tune after swap; for VFD duty, choose YE4 with reinforced winding insulation and insulated non-drive-end bearing.

Which PLC, HMI, and VFD brands does KOEED stock for these motor cells?

Allen-Bradley, Siemens, Mitsubishi, Omron, Schneider, Yaskawa, Panasonic, Fanuc, and KEYENCE — including CompactLogix, SIMATIC S7-1200 / S7-1500, MELSEC iQ-R, NX / NJ, Modicon M340 / M580, MP2300, FP7, and matching VFD / HMI lines.

How do I send a BOM that mixes Chinese motors and EU / Japanese automation parts?

Send the full list — kW rating, frame, IE class, pole count, VFD, PLC, HMI catalog numbers, and accessories — to Moritta@KOEED.COM. KOEED responds within 24 hours.