The worn out Teflon cap on a wind turbine ventilator had blocked it from spinning efficiently. Redesigning the cap's shape to fit the central shaft better could reduce friction and prevent wear, but would require manufacturing a new mold. Alternatively, adding magnets to the cap could create a gap with the shaft during spinning and prevent direct contact without changing the ventilator's design.

1. Problem Statement
• The Wind Turbine Ventilator worn out Teflon cap had blocked
the wind turbine ventilator spinning which had affected the
efficiency of the wind turbine ventilator.
Boundary Condition
• Size of wind turbine ventilators at “16 inch”.
• The material of central shaft is stainless steel.
• The surface design of the turbine ventilator can not be
change.

3. Engineering Contradiction
If the Teflon cap did not worn out by
the central shaft, than the efficiency of
the ventilator will be increase but the
assembly parts will be difficult and
manufacturing cost will be increase
duo to a new mole for a new shape
Contradiction Matrix

4. Substance Field ModelClass 1.2 of Inventive Solution

5. 1.1.2
• Changing the shape of the Teflon cap (S3) to fit with
the shape of the head of central shaft will be able to
reduce the friction between the Teflon cap and the
central shaft
1.2.3
• Adding the magnet (S3) to the Teflon cap to provide
a gap between the central shaft and the Teflon cap
which can prevent friction force occur when the
ventilator spinning due to central shaft and the
Teflon cap is not direct contact to each other.