Product Line · External Rotor Fans
External Rotor Fan Motors for Compact Ventilation
In an external rotor motor, the rotor is a cup that spins around the stator — and the fan impeller is mounted directly on that cup. Motor and fan become one short, integrated unit. External rotor fan motors are part of Nanyang’s official range and are specified per project.
- Model data
- Not published in the company catalogue
- Specification
- Confirmed per project, in writing
- Drawings / samples
- Availability confirmed per enquiry, in writing
This line is assessed project by project. Send your equipment drawings and duty data; the reply assesses feasibility first, and any specification, drawings, samples or pricing follow that assessment, in writing.
01 The Architecture
Why the rotor went outside
Conventional fan building pairs a standard motor with a separate impeller on its shaft — two components, two tolerances, and an axial length that eats the space compact equipment does not have. The external rotor design inverts the arrangement: the stator sits inside, the rotor forms a rotating bell around it, and the impeller blades attach to that bell. Axial length shrinks, the assembly arrives balanced as one unit, and speed control by voltage variation suits the architecture well. The design is a staple of compact ventilation: condenser and evaporator fans in refrigeration, fan-coil units, air curtains, heat-recovery ventilators, electronic cabinet cooling and small duct fans.
Choosing between this line and the shaded pole range is a packaging and duty decision. Shaded pole motors drive separate impellers and win on simplicity and unit cost at the smallest sizes. External rotor units win when the equipment’s depth is constrained, when an integrated motor-impeller assembly simplifies your own production line, or when the airflow duty needs a purpose-built fan rather than a motor with a blade attached. Send the duty data and the comparison can be priced both ways where both architectures genuinely fit.
02 Specifying
What the quotation is built from
- Air duty: target airflow and static pressure, or the fan curve of the unit being replaced
- Impeller: diameter, and whether the supply scope is motor only or motor with impeller fitted
- Electrical: market voltage and frequency (the company’s catalogue motors cover 220–240 V or 110 V, 50/60 Hz), speed control method expected
- Installation: mounting arrangement, airflow direction, ambient temperature and any moisture or dust exposure
- Programme: quantities per shipment and year, target markets and their certification requirements for the finished equipment
Air movement is the company’s home territory in more ways than one: its platform profile lists fan motors and air cooler motors among its main lines, backed by a works that has made appliance motors since 1992. Ventilation programmes consolidate naturally with its washing machine motor range in a single supply relationship.
03 Questions
External rotor fans, answered plainly
Is the impeller included?
Scope is agreed per project — motor only, or motor with impeller fitted and balanced. State which you need; the quotation names the scope explicitly.
Can the fan be speed-controlled?
Voltage-based speed control suits this architecture and is a normal part of the specification conversation. State your control method; feasibility for that control method is assessed against your duty data before any specification is confirmed.
Why no airflow table on this page?
Airflow belongs to a motor-impeller combination, not a motor alone, and the company publishes no model table for this line. Figures for a combination are only stated after that combination has been assessed — not copied from a generic chart.
Send the air duty
Airflow, pressure, impeller size and market, with your equipment data — the reply assesses feasibility against those facts before any quotation or specification is confirmed.