Rotor for a synchronous reluctance electric machine, an electric machine, and a manufacturing method of a rotor

A method of manufacturing a rotor of a synchronous reluctance electric machine, the method comprising

• forming core elements of the rotor, wherein at least two sectorial sections and a central hole are formed to each core element, those sectorial sections locating at least partially around the central hole of the core element, said center hole defining the location of the rotational axis of the rotor, and wherein at least one flux barrier is formed to each sectorial section,
• stacking the core elements to a stack of consecutive core elements, and
• binding the stack of core element so as to hold together the stack of consecutive core elements so as to form a rotor core having a first end and a second end, and
• wherein
• when forming each core element, each core element is formed to include at least one interconnecting sub channel extending axially through the core element, said interconnecting sub channel being formed to a core element area defined by the flux barriers of the adjacent sectorial sections of the core element and the central hole of the core element, and wherein
• the binding of stack of core elements is done by casting so that the cast material is directed to flow into one or more interconnection channels locating in an area defined by the flux barriers of the adjacent sectorial sections of the core elements and the central holes of the core elements, said interconnection channels being formed by aligning interconnecting sub channels of the consecutive core elements,
• casting first end plate to the first end of the stack of core elements,
• casting second end plate to the second of the stack of core elements, and
• wherein
• the casting of the interconnection casts and the casting of the first and second end plates is done in such way that the casting forms a unitary cast comprising the interconnection casts and the casted first and second end plate.