Electric machine and configuration method

摘要

The present disclosure relates to a method of configuring an electric machine 1. The electric machine 1 has a rotor 5 having Np rotor poles 12, where Np is the number of rotor poles 12; and a stator 4 having one or more cut-out sector and Nt stator teeth 9, where Nt is the number of stator teeth 9. The electric machine 1 is configured in dependence on a base model Base1 having NtBase stator teeth 9 and NpBase rotor poles 12, where NtBase and NpBase are both integers greater than one and NpBase is an odd number. The method includes calculating Np using the equation Np=((1-(-1)f )/2)+2*k+Npbase*f and calculating Nt using the equation Nt = NtBase *f where Np is the number of rotor poles 12 and is greater than one; Nt, is the number of stator teeth 9 and is greater than one; NpBase is the number of rotor poles 12 in the base model; NtBase the number of stator teeth 9 in the base model; k is a non-negative integer; and f is a positive integer. In the case where NpBase is an even number Np=2*k+Npbase*f. Equations for calculating α (the sector angle of the cutouts) and β (the pitch of the teeth) are disclosed.