EFFECT OF MODULE VARIATION ON A 100WATT HORIZONTAL AXIS WIND TURBINE SPUR GEAR DRIVE

AYADJU G., EFEBOMO K.

Abstract


Spur gears are simple to design and construct to actualize their usage in power transmission as well as for speed
reduction or increase. The aim of this research work is to determine the effect of module variation on a 100Watt
horizontal axis wind turbine (HAWT) spur gear drive. The solution is to determine and appropriately select gear
parameter values based on design considerations and the significance is for enhanced machine reliability and balance
with economic production. The method used involved the application of gear design principles, modelling the gears
with AutoCAD, module variation and evaluation of induced bending stress at the gears root; gear diameter, tooth
thickness and face width become bigger with choosing higher modules for cutting tooth size, with the largest diameter
of 168.4mm and 80mm for driver and driven gear respectively and face width of 60mm from using a module of 6mm.
Although, the total torque exerted remains constant at 7.9Nm and 3.8Nm for a 100W HAWT. The tangential force in
meshed operation of the gears and induced bending stress kept reducing as module increased. The highest tangential
force is 282.4N and corresponding induced bending stress is 26.1N/mm2 based on American Gear Manufacturers
Association (AGMA) standard and the range of data analyzed, at the lowest module of 2mm. Selecting lower modules
means that higher bending stresses will be induced at the gears root, but smaller production cost and more compact
system with less space requirement. The lower bending stresses with increasing module will support higher load
capacity of the gears due to the increasing face width and enhance the reliability of the HAWT in respect of its
performance.


Keywords


Module, Spur Gear, Power Transmission, Bending Stress, Wind Turbine

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