Abstract: The present disclosure relates to a rotor for an electric machine. The rotor has a plurality of rotor poles each having at least one aperture. The at least one aperture includes a chamber for receiving a magnet; and at least one flux barrier for controlling the path through which magnetic flux flows in the rotor. The rotor poles each have at least one flux guide for guiding magnetic flux across the at least one flux barrier during a demagnetization event. The flux guide(s) form a constriction between the magnet receiving chamber and the flux barrier. The present disclosure also relates to an electric machine comprising a rotor; and a vehicle comprising an electric machine.

Abstract: Aspects of the present invention relate to a rotor assembly (3) for an electric machine (1). The rotor assembly (3) includes a rotor (6). A plurality of permanent magnets (10) are mounted in respective magnet mounting apertures (11) formed in the rotor (6). The permanent magnets (10) each have first and second ends (15A, 15B). The rotor (6) has a plurality of circumferential rotor sections (20-n) formed between one or more of the magnet mounting apertures (11) and an outer circumference (C1) of the rotor (6). The circumferential rotor sections (20-n) each have at least one demagnetization protection barrier (21) for controlling a magnetic field applied to an associated one of the permanent magnets (10) during a demagnetization event. The present invention also relates to a rotor (6); and an electric machine (1) having a rotor assembly (3). The electric machine (1) is suitable for use in an electric drive unit for a vehicle (1).

Abstract: An electrical machine comprises a stator and a rotor having a plurality of poles. Each pole comprises a radial axis centrally through the pole. Each pole comprises a first slot configuration having a magnet located centrally within the slot with the radial axis passing through the magnet or the magnet being substantially perpendicular to the radial axis. Each pole comprises a second slot configuration having a pair of magnets located at spaced apart positions within the slot. The pair of magnets are located each side of the radial axis. The first slot configuration is located between the second slot configuration and an outer perimeter of the rotor.

Abstract: An electrical machine (1) comprises a stator (20) and a rotor (10) having a plurality of poles (4). A pole comprises a radial axis (5) centrally through the pole. A pole comprises a first slot configuration (12, 13) having a magnet (15, 16) located centrally within the slot with the radial axis (5) passing through the magnet (15, 16) or the magnet being substantially perpendicular to the radial axis. A pole comprises a second slot configuration (11) having a pair of magnets (14-1, 14-2) located at spaced apart positions within the slot. The pair of magnets (14-1, 14-2) are located each side of the radial axis (5). The first slot configuration (12, 13) is located between the second slot configuration (11) and an outer perimeter (19) of the rotor (10).

Abstract: The present disclosure relates to an electric machine (1) having a rotor (5) and a stator (4). The rotor (5) has a plurality of rotor poles (12). The stator (4) is part-annular and has a plurality of stator teeth (9) each having a winding. The stator (4) includes a plurality of sets (S1-9) of said stator teeth (9), each set (S1-9) comprising more than one stator tooth (9). The sets (S1-9) are magnetically de-coupled from each other. The windings (11) on the stator teeth (9) in each set (S1-9) are in different phases (A, B, C). The present disclosure also relates to a vehicle (2) having an electric machine (1) of the type described herein.

Abstract: 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 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 (I) and calculating Nt using the equation (II); 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 is the number of stator teeth (9) in the base model; k is a non-negative integer; and f is a positive integer.

Abstract: The present disclosure relates to an electric drive motor (101; 201) for a vehicle. 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 at least a first permanent magnet (104; 204) centred on a d-axis of the pole (106; 206); and a plurality of flux barriers (109; 209) for disrupting at least an n-th order torque harmonic of the electric drive motor (101). Proximal to an outer surface of the rotor (102; 202), a first angular period (x11) between first and secondary flux barriers is defined by the equation (xi1=tao/n1), whereby: (xi1) is the first angular period; (tao) is the pole step; and n1 is an order number of a torque harmonic to be disrupted.