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  Brushless motorUSPTO Application #: 20060208596Title: Brushless motor Abstract: A brushless motor with a rotor having a magnet and a magnetic return, the magnet and magnetic return being arranged to form a gap therebetween, and a stator having a coil disposed in the gap. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims. (end of abstract) Agent: Mcdermott, Will & Emery (los Angeles Office) - Los Angeles, CA, US Inventors: Gregory S. Graham, Gerald W. Yankie USPTO Applicaton #: 20060208596 - Class: 310201000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20060208596. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATION [0001] The present application is a continuation of application Ser. No. 11/075,388, filed on Mar. 8, 2005, which is a continuation of application Ser. No. 10/125,809, filed Apr. 18, 2002, now U.S. Pat. No. 6,873,085, which claims priority under 35 U.S.C. .sctn. 119(e) to provisional Application No. 60/291,704, filed May 16, 2001 and provisional Application No. 60/354,792, filed Feb. 6, 2002, the contents of which are expressly incorporated herein by referenced as though fully set forth in full. BACKGROUND [0002] 1. Field [0003] The present invention relates to electrical machines, and more particularly, to brushless electric motors. [0004] 2. Background [0005] Generally a brushless motor includes a rotor having a shaft with a permanent magnet affixed thereto. The brushless motor may also include a stator having a hollow cylinder with ball bearing mounted on an interior portion of the cylinder to rotatably support the rotor shaft. The stator may also include induction coil windings mounted on the case of the motor or interleaved with laminated iron rings. Current may be applied to the stator windings to cause the magnet to rotate and thereby deliver rotary power to the rotor shaft. [0006] Although brushless motors generally can be made to spin faster and handle higher currents than brush motors, they have disadvantages associated with variations in the magnetic flux field at the magnets and the laminations that comprise the magnetic return path, which may cause cogging and concomitant vibration in the motor and associated structures as well as energy losses in the laminations due to induced eddy currents. Slotless brushless DC motors may exhibit reduced cogging but may require that the wires comprising the stator be supported by a fixed laminate structure thus having reduced energy conversion efficiency due to induced eddy current losses. Energy losses due to heating of the laminate structures found in brushless motors may negatively impact the efficiency of the motor and total power output. There is therefore a need in the art for improvements in brushless motor design. SUMMARY [0007] In one aspect of the present invention, a brushless motor includes a rotor having a magnet and a magnetic return, the magnet and magnetic return being arranged to form a gap therebetween, and a stator having a coil disposed in the gap. [0008] In another aspect of the present invention, a brushless motor includes a rotor having a mounting surface, a magnet disposed on the mounting surface, and a magnetic return surrounding the magnet to form a gap therebetween, and a stator having a coil disposed in the gap. [0009] In a further aspect of the present invention, a brushless motor includes a rotor having first and second concentric cylinders, and a magnet disposed on an outer surface of the first cylinder, the second cylinder surrounding the first cylinder to form a cylindrical gap therebetween, and a stator having a free-standing cylindrical coil disposed in the gap. [0010] It is understood that other aspects of the present invention will become readily apparent to those skilled in the art from the following detailed description, wherein is shown and described only exemplary embodiments of the invention, simply by way of illustration. As will be realized, the invention is capable of other and different embodiments, and its several details are capable of modifications in various respects, all without departing from the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive. BRIEF DESCRIPTION OF THE DRAWINGS [0011] Aspects of the present invention are illustrated by way of example, and not by way of limitation, in the accompanying drawings in which like reference numerals refer to similar elements wherein: [0012] FIGS. 1A and 1B are graphical illustrations exhibiting a plan view of a pair of copper plates, precision cut for use in an exemplary brushless motor; [0013] FIG. 2 is a graphical illustration of an elevation perspective view of the copper plate of FIG. IA rolled into a hollow cylinder for use in an exemplary brushless motor; [0014] FIG. 3 is a graphical illustration of an elevation perspective view of the copper plate of FIG. 1B rolled into a hollow cylinder for use in an exemplary brushless motor; [0015] FIG. 4 is a graphical illustration of an elevation perspective view of the cylinder of FIG. 2 being inserted into the cylinder of FIG. 3 to form a cylindrical conductive coil for use in an exemplary brushless motor; [0016] FIG. 4A is a graphical illustration of an enlargement a portion of FIG. 4 illustrating detail of a wound glass fiber layer; [0017] FIG. 5 is a graphic illustration of the interconnection of conductive loops to form a continuous cylindrical conductive coil for use in an exemplary brushless motor; [0018] FIG. 6 is a graphic illustration of a lateral cross-sectional view of an exemplary brushless motor; [0019] FIG. 7 is a graphic illustration of a longitudinal cross-sectional view illustrating the construction of a stator for an exemplary brushless motor; [0020] FIG. 8 is a graphic illustration of a longitudinal cross-sectional view of a rotor adapted for use with the stator of FIG. 7 in an exemplary brushless motor; and Continue reading... Full patent description for Brushless motor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Brushless motor patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Brushless motor or other areas of interest. ### Previous Patent Application: Three-phase synchronous ac generator with electrically phase shifted stator windings for reduced mechanical and magnetic noise Next Patent Application: Hybrid induction motor Industry Class: Electrical generator or motor structure ### FreshPatents.com Support Thank you for viewing the Brushless motor patent info. 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