YKK400-6 efficiency & maintenance — HV Enclosed Squirrel-Cage Motor by Manufacturer

YKK400-6 is a high-performance HV Enclosed Squirrel-Cage Motor built by the manufacturer, rated approx. 330 kW, voltage 6kV / 10kV, synchronous speed 1000 r/min, protection IP54, efficiency IE3 / IE4. This guide covers model meaning, specifications, applications and ordering.

1. What YKK400-6 means: series ≠ model

Many buyers treat “YKK” as a full model — a common mistake. The series code is only a product family; a complete motor model must include the frame size and pole count. For YKK400-6:

• YKK — series code, HV Enclosed Squirrel-Cage Motor;
• 400 — frame size (center height in mm);
• -6 — pole count, 6 poles → synchronous speed 1000 r/min.

Only YKK400-6 is the unique, orderable model; “YKK” alone cannot pin down the spec.

2. Key specifications

3. Technical features

• VPI vacuum pressure impregnation with Class F insulation (Class B rise) for excellent dielectric strength.
• SKF/FAG bearings with vibration below GB 10068 limits for smooth running.
• Air-water / air-air cooling with large thermal margin for continuous S1 duty.
• Rigid welded steel frame, low noise, IP54 for dusty / humid environments.
• Optional Pt100 sensors, space heater and smart terminal box for condition monitoring.

4. Adjacent frame selection

5. Typical industries

6. Standards

• GB 755
• IEC 60034-1

7. Ordering notes

• State full model, power, voltage, speed/poles, mounting (IMB3/B5/V1) and protection/Ex level.
• Specify environment (temp, altitude, humidity, medium) and starting method (DOL/VFD/soft-start).
• Request special shaft, dual shaft, tachogenerator, encoder or brake at order time.
• Confirm cooling (IC411/IC416/IC611/IC81W) and matching cooler / inverter brand.
• Allow 10–15% power margin; confirm lead time, warranty and site commissioning scope.

8. FAQ

Q: What is the difference between “YKK” and YKK400-6?

A: “YKK” is only the HV Enclosed Squirrel-Cage Motor family code; YKK400-6 adds frame and poles and is the orderable spec.

Q: What is the rated power of YKK400-6?

A: Estimated approx. 330 kW (6kV / 10kV); final value per datasheet and order confirmation.

Q: Is frame 400 large? Any mounting notes?

A: 400 mm is a medium-large frame; bolt pattern per IMB3, foundation must be leveled, on-site guidance recommended.

Q: What is the protection / Ex level?

A: Protection IP54; for hazardous areas confirm the Ex mark and gas group.

Q: Why does efficiency IE3 / IE4 matter?

A: Higher efficiency cuts running cost and heat, ideal for continuous duty with short payback.

Q: How is YKK400-6 cooled?

A: Cooling IC611; keep cooling water/air path clear under full load.

Q: Can it be customized?

A: Yes — voltage, speed, shaft, mounting, sensors and coating; state requirements at order.

Q: Where to get quote and datasheet for YKK400-6?

A: Visit www.xadjw.com or contact Xi’an XIMA sales engineers for selection and quote.

9. About the manufacturer

YKK400-6 is designed and built by Xi'an XIMA Electric (Group) Co., Ltd. (founded 1955), covering HV, LV, flameproof, VFD and DC motors, shipped to 30+ countries. For datasheet, quote or customization of YKK400-6, visit www.xadjw.com or contact a sales engineer.