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Method for a low-power rotary piezoelectric fan

IP.com Disclosure Number: IPCOM000144740D
Publication Date: 2007-Jan-06
Document File: 3 page(s) / 133K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a low-power rotary piezoelectric fan. Benefits include improved functionality, improved performance, and improved power performance.

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Method for a low-power rotary piezoelectric fan

Disclosed is a method for a low-power rotary piezoelectric fan. Benefits include improved functionality, improved performance, and improved power performance.

Background

      The smallest conventional fans are 15-mm x 15-mm x 4.5 mm. They are actuated by an electromagnetic motor, which has very low energy efficiency (such as <1%) (see Figure 1).

      Conventional piezoelectric cantilever fans have a length of about 2-3 inches with a single piezoelectric element. The air flow is not as effective as a rotary fan, mainly due to the electrical motor inefficiency (see Figure 2).

      Hand-held devices do not conventionally use a fan. However, they generate increasing amounts of heat and are expected to require cooling.

Description

      The disclosed method is a low-power rotary piezoelectric fan. A low-power conventional rotary fan is actuated by a piezoelectric actuator. The fan blades and geometry are similar to the conventional rotary axial fan. However, they are rotated by a piezoelectric actuator that uses a cam to convert the linear movement to the fan hub rotation. The linear movement is generated by a piezoelectric blade that has two (dual) piezoelectric films attached to the end of the blade(s) (see Figure 3).

      Experimentation indicates an unoptimized 20-mm piezoelectric e...