Rotor of a variable-reluctance synchronous motor

Abstract

A process for assembling a rotor of a variable-reluctance synchronous motor, characterised in that it comprises the steps of:i. preparing a plurality of discs having a through-cavity for each polar sector for housing at least a magnet;ii. positioning the discs in sequence along an axis of rotation for forming the rotor, so that the through-cavities are aligned to one another;iii. preparing magnets having an identical depth that is smaller than the depth of the rotor, and a frontal section that is identical to or smaller than the area of the cavity;iv. calculating the number of magnets to be inserted, for each polar sector, in a sequence so as to occupy only part of the total depth of the rotor as a function of the performances to be obtained;v. inserting the calculated number of magnets in a series of cavities aligned for each polar sector.The invention also relates to a rotor of a variable-reluctance synchronous motor assembled using the process set out above.

1 . A process for assembling a rotor of a variable-reluctance synchronous motor, comprising:
 i. preparing a plurality of discs, wherein each disc has at least a through-cavity for each polar sector for housing at least a magnet;   ii. positioning the plurality of discs in sequence along an axis of rotation for forming the rotor, so that said through-cavities are aligned to one another in a parallel direction to said axis of rotation;   iii. preparing a plurality of said magnets with a predefined depth that is identical for at least a part of said magnets and having a section area, according to a plane that is perpendicular to the direction of said axis of rotation, that is equal to or smaller than the access area of said through-cavity, said predefined depth of each magnet being smaller than the total depth of the rotor;   iv. calculating the number of magnets to be inserted, for each polar sector, in a sequence along said direction parallel to said axis of rotation, so as to occupy only part of the total depth of the rotor as a function of predetermined performances of motor torque which are to be obtained;   v. inserting the calculated number of magnets in at least a through-cavity of each polar sector so as to occupy the aligned through-cavities of a plurality of said discs arranged in sequence up to obtaining the depth defined by the calculated number of magnets.   
     
     
         2 . The process for assembling a rotor of a variable-reluctance synchronous motor according to  claim 1 , wherein said step of inserting includes each polar sector having a plurality of through-cavities suitable for housing said magnets and the insertion of said magnets takes place in at least one of the through-cavities. 
     
     
         3 . The process for assembling a rotor of a variable-reluctance synchronous motor according to  claim 1 , wherein the step of inserting includes said magnets being arranged symmetrically with respect to said axis of rotation in each disc. 
     
     
         4 . The process for assembling a rotor of a variable-reluctance synchronous motor according to  claim 1 , wherein the step of preparing the plurality of said magnets includes preparing magnets having a predefined depth that is identical for all the magnets or having a depth that is a multiple or sub-multiple of said predefined depth. 
     
     
         5 . The process for assembling a rotor of a variable-reluctance synchronous motor according to  claim 1 , wherein the step of preparing said discs includes preparing a predefined module and the module comprises a predetermined number of said discs; said process comprising a step of realising “magnetized” modules comprising magnets inserted in the cavities of each polar sector and a step of realising “empty” modules without magnets, wherein said “magnetized” modules and said “empty” modules are mutually interchangeable as a function of the torque performances of the motor that are to be obtained. 
     
     
         6 . The process for assembling a rotor of a variable-reluctance synchronous motor according to  claim 5 , wherein said step of calculating being carried out by calculating the number of “magnetized” modules to be used for realising the rotor according to the torque performances that are to be obtained; said process including placing in sequence the calculated number of “magnetized” modules with the “empty” modules, so as to form the rotor. 
     
     
         7 . The process for assembling a rotor of a variable-reluctance synchronous motor according to  claim 1 , wherein said step of inserting includes each of said magnets having a section area that is complementarily-shaped with respect to the access area of said plurality of through-cavities and includes the insertion of said magnets occurring in at least one of the through-cavities for each polar sector.