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A motor/generator has its stationary portion, i.e., the stator, positioned concentrically within its rotatable element, i.e., the rotor, along the axis of rotation of the rotor. The rotor includes a Halbach array of magnets. The voltage and power outputs are regulated by varying the radial gap in be

A motor/generator has its stationary portion, i.e., the stator, positioned concentrically within its rotatable element, i.e., the rotor, along the axis of rotation of the rotor. The rotor includes a Halbach array of magnets. The voltage and power outputs are regulated by varying the radial gap in between the stator windings and the rotating Halbach array. The gap is varied by extensible and retractable supports attached to the stator windings that can move the windings in a radial direction.

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1. A motor/generator for regulating an output voltage or a mechanical power output, comprising:a rotor including a Halbach array; and a stator including a plurality of electrically conductive windings, wherein at least one winding of said plurality of electrically conductive windings is attached to

1. A motor/generator for regulating an output voltage or a mechanical power output, comprising:a rotor including a Halbach array; and a stator including a plurality of electrically conductive windings, wherein at least one winding of said plurality of electrically conductive windings is attached to an extensible and retractable support. 2. The motor/generator of claim 1, wherein:said rotor is rotatable about an axis of rotation; said stator and said rotor are concentric, with said stator lying closer to said axis than said rotor; and said stator is stationary relative to said axis of rotation. 3. The motor/generator of claim 2, wherein said gap varies radially relative to said axis of rotation.4. The motor/generator of claim 3, wherein:said Halbach array is comprised of a plurality of magnets configured in a cylindrical shape, and has an inner surface and an outer surface, with said inner surface being closer to said axis of rotation than said outer surface; and said rotor includes a cylinder attached to said outer surface. 5. The motor/generator of claim 4, wherein said cylinder is comprised of a fiber composite.6. The motor/generator of claim 4, wherein:said Halbach array generates a magnetic field having a pole order; and said plurality of magnets is a number equal to four times said pole order. 7. The motor/generator of claim 4, wherein:each of said windings has an approximately rectangular shape including an inner section and an outer section, with said inner section being closer to said axis of rotation than said outer section; and said gap lies in between said inner surface of said Halbach array and said outer section of said windings. 8. The motor/generator of claim 7, further comprising:a plane intersecting each of said windings, respectively, and said axis of rotation; and said windings being azimuthally spaced apart from each other, whereby said windings are azimuthally disposed around said axis of rotation. 9. The motor/generator of claim 8, wherein:each of said windings lies in between two other of said windings and is spaced apart from each of said two other windings by a spacing; and said spacing is equal for each of said windings. 10. The motor/generator of claim 9, further comprising:a centripetal magnetic field emanating from said Halbach array; said magnetic field having a wavelength; and said spacing being at least one-half of said wavelength. 11. The motor/generator of claim 7, wherein said support is located in between said axis of rotation and said inner section of said windings.12. The motor/generator of claim 1, wherein:said rotor is rotatable about an axis of rotation at an angular velocity; and a gap between said at least one winding and said rotor is varied by said support to maintain an output voltage at an approximately constant value independent of angular velocity. 13. The motor/generator of claim 1, wherein:a variable input voltage applied to said stator is converted into a mechanical power output; and a gap between said at least one winding and said rotor is varied by said support to maintain the mechanical work output at an approximately constant value independent of input voltage. 14. A method for regulating an output voltage of a generator comprising:generating an output voltage by rotating a rotor including a Halbach array, with respect to a stator, wherein said stator includes a plurality of electrically conductive windings, wherein at least one winding of said plurality of electrically conductive windings is attached to an extensible and retractable support; and regulating said output voltage by varying a radial gap between said Halbach array and said stator by adjusting said extensible and retractable support.