Electric motor

Abstract

An electric motor design for hub motors comprises a stator assembly, having an axle, a stator plate sector holder, fixed on the axle, at least one stator sector assembly, mounted on the stator plate holder, and electric coils, would around the plates of the stator plate assembly; and a rotor assembly, having a casing, a rotor magnet retainer assembly, placed inside of the casing, and at least one permanent magnet, mounted on plates of the rotor magnet retainer assembly; wherein the stator sector assembly and/or the rotor magnet retainer assembly have plates which are stacked on top of each other and which are each divided into at least two sectors, saving production cost.

1 . An electric motor comprising:
 a stator assembly, further comprising
 a stator axle, 
 a plurality of electric coils, forming a plurality of electric coil magnetic poles, 
 a stator plate holder, fixed on said stator axle, 
 at least one stator plate assembly, mounted on said stator plate holder, having
 a plurality of stator plates that are stacked on one another in the axial direction, each of said stator plates being divided into at least two stator plate sectors, each of said stator sector plates having 
 at least one elongated alignment ridge diametrically oriented on a first major surface, 
 at least one matching alignment valley opposingly positioned on a second major surface for nesting with said alignment ridge of an adjacent rotor sector plate, thereby maintaining alignment within said stack of stator sector plates, and 
 at least one fixing hole centrally located for fixing the stacked said stator sector plates to said stator plate holder, and 
 at least one of said a plurality of electric coils being wound around said stator plates of said stator plate assembly; and 
 
   a rotor assembly, further comprising
 a casing, 
 a rotor magnet retainer plate assembly, placed inside of said casing, and 
 a plurality of permanent magnets, forming a plurality of permanent magnet poles, said plurality of magnet poles being substantially equal in number to the number of said plurality of electric coil magnetic poles, mounted on an inward surface of said rotor magnet retainer assembly. 
   
   
   
       2 . The electric motor according to  claim 1 , wherein said stator plate sectors of said stator plate assembly have edges with mating protrusions and recesses to be mutually fitted. 
   
   
       3 . The electric motor according to  claim 1 , wherein said stator plate sectors of said stator plate assembly have alignment ridges and valleys for stacking plates of said stator plate assembly on each other. 
   
   
       4 . The electric motor according to  claim 1 , wherein said stator plate assembly has seats for holding said electric coils. 
   
   
       5 . The electric motor according to  claim 1 , wherein said stator plate sectors have fixing holes, allowing to be fastened to said stator plate holder by bolts or screws. 
   
   
       6 . The electric motor according to  claim 1 , wherein the number of permanent magnet poles of the rotor magnet retainer plate assembly is 16.