| 摘要 |
The electric drive motor 101; 201 has a stator 103 having a plurality of slots 107; and a rotor 102; 202 having a plurality of poles 106; 206, the poles 106; 206 each have permanent magnets 105,104; 204,205,212 centred on a d-axis of the pole 106; 206; and a plurality of primary flux barriers 109,110; 209,210,213 for disrupting at least an nth order torque harmonic of the electric drive motor 101. Proximal to an outer surface of the rotor 102; 202, a first angular period Ƹ1 between first and second primary flux barriers is defined by the equation Ƹ1 = τ/n1 whereby Ƹ1 is the first angular period; τ is the pole step; and n1 is an order number of a torque harmonic to be disrupted. Alternatively, the first angular period Ƹ1 between first and secondary flux barriers is defined by the equation Ƹ1= τ/n2 whereby: Ƹ1 is the first angular period; τ is the pole step; and n2 is an average order number of first and second torque harmonics to be disrupted. Secondary flux barriers 111 may be present e.g. positioned between the magnet 105 and the pole surface. |
