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.

1 . A brushless motor, comprising: 
 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.    
   
   
       2 . The brushless motor of  claim 1  wherein the rotor further comprises a shaft rotatably coupled to the stator.  
   
   
       3 . The brushless motor of  claim 1  wherein the rotor further comprises a rotor faceplate supporting the magnet and the magnet return.  
   
   
       4 . The brushless motor of  claim 3  wherein the rotor further comprises a mounting surface supporting the magnet.  
   
   
       5 . The brushless motor of  claim 4  wherein the magnet comprises a plurality of magnets.  
   
   
       6 . The brushless motor of  claim 3  wherein the rotor further comprises a shaft coupled to the rotor faceplate.  
   
   
       7 . The brushless motor of  claim 1  wherein the stator coil comprises a pair of concentric conductive sheet metal windings each comprising a plurality of axially extending spaced apart conductive bands, each of the conductive bands of one of the windings being coupled to one of the conductive bands of the other winding.  
   
   
       8 . The brushless motor of  claim 7  wherein the stator further comprises a stator faceplate supporting the stator coil.  
   
   
       9 . The brushless motor of  claim 8  wherein the rotor further comprises a shaft rotatably coupled to the stator faceplate.  
   
   
       10 . A brushless motor, comprising: 
 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.    
   
   
       11 . The brushless motor of  claim 10  wherein the mounting surface and the magnetic return are concentric.  
   
   
       12 . The brushless motor of  claim 11  wherein the mounting surface and the magnetic return are cylindrical.  
   
   
       13 . The brushless motor of  claim 12  wherein the stator coil is cylindrical and is disposed in the gap concentrically with the mounting surface and the magnetic return of the rotor.  
   
   
       14 . The brushless motor of  claim 10  wherein the magnet comprises a plurality of magnets each extending along the mounting surface in an axial direction and being spaced apart an equal distance from one another.  
   
   
       15 . The brushless motor of  claim 10  wherein the stator further comprises a stator faceplate supporting the stator coil, the rotor being rotatably mounted to the stator faceplate.  
   
   
       16 . The brushless motor of  claim 15  wherein the rotor further comprises a shaft supported by the rotor faceplate, the shaft being rotatably mounted to the stator faceplate.  
   
   
       17 . The brushless motor of  claim 10  wherein the rotor further comprises a rotor faceplate with the mounting surface and the magnetic return concentrically extending therefrom in an axial direction, and a shaft extending axially along a central axis common to the mounting surface and the magnetic return, and wherein the stator further comprises a stator faceplate supporting the stator coil, the rotor shaft being rotatably to the stator faceplate such that the stator coil can rotate in the gap.  
   
   
       18 . The brushless motor of  claim 17  wherein the mounting surface, the magnetic return, and the stator coil are cylindrical.  
   
   
       19 . The brushless motor of  claim 10  wherein the stator coil comprises a pair of concentric conductive sheet metal windings each comprising a plurality of axially extending spaced apart conductive bands, each of the conductive bands of one of the windings being coupled to one of the conductive bands of the other winding.  
   
   
       20 . A brushless motor, comprising: 
 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.    
   
   
       21 . The brushless motor of  claim 20  wherein the stator coil comprises a pair of concentric conductive sheet metal windings each having a plurality of axially extending conductive bands separated from an adjacent conductive band by a space, each of the conductive bands of one of the windings being coupled to one of the conductive bands of the other winding.  
   
   
       22 . The brushless motor of  claim 20  wherein the rotor further comprises a circular disc, the first and second cylinders extending from the circular disc in an axial direction.  
   
   
       23 . The brushless motor of  claim 22  wherein the rotor further comprises a shaft coupled to the circular disc and extending therefrom in an axial direction along a common axis of the first and second cylinders, the shaft being rotatably coupled to the stator.  
   
   
       24 . The brushless motor of  claim 23  wherein the stator further comprises a faceplate supporting the stator coil, the rotor shaft being rotatably coupled to the stator faceplate.  
   
   
       25 . The brushless motor of  claim 21  wherein the magnet comprises a plurality of magnets each extending in an axial direction along the outer surface of the first cylinder and being equally spaced apart from one another.