Skip to content

References: Fan Motors and Enclosures

  1. Induction motor - Wikipedia - Explains the rotating stator field, synchronous speed, slip and why the rotor runs slightly slow. Supports the chapter's induction motor section and its 50 Hz versus 60 Hz worked example.

  2. Brushless DC electric motor - Wikipedia - Covers electronically commutated motors with permanent-magnet rotors and electronic controllers, the technology behind the EC motors and 0-10 V speed control described in this chapter.

  3. IP code - Wikipedia - Defines the IEC ingress protection digits for solids and water. Helps decode the IP22, IP44, IP54, IP55 and IP56 ratings that FanPedia maps to motor enclosures.

  4. Electric Motors and Drives: Fundamentals, Types and Applications (5th ed.) - Austin Hughes and Bill Drury - Newnes - Hughes is known for explaining induction and permanent-magnet motors through physical pictures of flux and force rather than heavy mathematics, an approach that suits readers without electrical engineering training.

  5. Electric Machinery Fundamentals (5th ed.) - Stephen J. Chapman - McGraw-Hill - Chapman's widely used text develops induction motor slip, torque and efficiency through numerous worked numerical examples, a good next step after this chapter's synchronous speed and slip calculations.

  6. FanPedia: The Fan & Blower Encyclopedia (PDF) - Twin City Fan - The chapter's primary source: motor technologies, nameplate, service factor and insulation (pp. 68-69), specifications and efficiency (pp. 71-72), enclosures (p. 73), frames (p. 74), modifications (p. 75) and bases (pp. 76-78).

  7. FanPedia online - Twin City Fan - Online edition of FanPedia; its Motors and Motor Bases galleries reproduce the motor specification, enclosure, frame and base pages that this chapter decodes field by field.

  8. Integral AC Motor Selection and Application Guide for Fans (FE-800) - Twin City Fan - Engineering letter on three-phase induction motor construction, slip, service factor, insulation and enclosures, written specifically for fan applications.

  9. VFD Induced AC Motor Shaft Current and Bearing Damage (FE-4000) - Twin City Fan - Explains how VFD switching induces shaft voltage that pits bearings, and lists remedies including insulated bearings and shaft grounding rings, as in this chapter's accessory section.

  10. NFPA 70, National Electrical Code (NEC) - NFPA - The code under which hazardous locations and their gas and dust groups are classified, the classification an explosion proof (DFG) fan motor must be built for.