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Design and Construction of Low Speed Direct Drive Permanent Magnet Alternator

This report presents an analytical design of Low-Speed Axial-Flux Permanent Magnet Alternator LSAFPMA for short shaft IWM. Emphasis has been placed on the design of axial-flux generator with a double rotor single stator configuration. The design model developed in this study incorporates facilities to include both the electromagnetic design and mechanical design of the generator as well as to take into consideration the complexity of the permanent-magnet shapes, size and number which is a typical requirement for the design of high-performance permanent-magnet generator. A prototype machine with rated 3kW output power at 300 RPM speed has been designed and constructed for the purposes of ascertaining the results obtained from the analytical design model.

A study of low-speed axial-flux generator (which was already present in KU) that generates 350Watt at 300 rpm, 12 poles and 20pole, 3Kw, 50 Hz at 300rpm is presented. The study concentrates on overall efficiency of both generators with different rotation speeds min-1(RPM). And specially focus on 300 RPM which is the speed of Improve Water Mill (IWM) and is based on calculated designs.

The new LSAFPMA (Prototype IV) is designed to produce about 3000 Watt at 300 rpm. It will produce three-phase 440 V AC at 50 Hz electricity capable to run small-scale enterprises. The Prototype IV has a coreless double-sided stator winding (30 coils, 3­phase winding) mounted on wooden board. It is sandwiched between twin rotors with 20 surface-mounted segment-type NdFeB permanent magnets having a regular magnet to coil surface air-gap of minimum 3 mm. These magnets are protected firmly against flying away due to centrifugal force while in operation. The rotor axle is guided by two bearings fixed on stator that incorporates housing and fixing arrangement to foundation. It is designed to directly couple with the extended short-shaft IWM. This report deals with the performance of LSAFPMA (Prototype IV) in the laboratory setup.

Keywords: Axial-Flux Permanent-Magnet Alternator, Improve Water mill (IWM)


  •     Namrata Tusuju Shrestha
  •     Nijan Yogal
 

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