Linear electromagnetic zero net mass jet actuator

An electromagnetic zero net mass jet (ZNMJ) actuator, comprising:

• a first annular permanent magnet;
• a second annular permanent magnet disposed within a central opening in said first annular permanent magnet to define an air gap between an inner surface of said first annular permanent magnet and an outer surface of said second annular permanent magnet;
• a coil disposed within said air gap, said first and second annular permanent magnets providing a concentrated flux field across said coil;
• a diaphragm operatively coupled to said coil to thereby move with said coil in response to the flow of an oscillating electrical current through said coil;
• and
• a bellows secured to said diaphragm and encompassing said first annular magnet, said second annular magnet and said coil;
• whereby oscillating movement of said diaphragm creates jets of air directed away from said actuator.

A method for forming an electromagnetic zero net mass jet (ZNMJ) actuator, comprising:

• providing a first permanent magnet;
• providing a second permanent magnet disposed adjacent to said first permanent magnet to define an air gap therebetween;
• disposing a coil in said air gap;
• using a structure to support said permanent magnets;
• disposing a bellows around said first permanent magnet, said second permanent magnet and said coil;
• coupling an air moving member to said coil;
• and
• passing an oscillating electrical current through said coil to cause said coil to oscillate, and thereby cause said air moving member to create jets of air.