An electric motor includes a rotor; a first stator provided with a plurality of teeth, and a second stator stacked in an axial direction of the first stator, the teeth of the second rotor being disposed and aligned with the corresponding plurality of teeth of the first stator in the axial direction. The first and the second stator are formed of a plurality of split cores being split along a plurality of split surfaces. A position of each of the split surfaces of the second stator is displaced from a position of the corresponding one of the split surfaces of the first stator in the circumferential direction by an angle (=(2/N)/2+n(2/N), where N is a least common multiple of the number of magnetic poles of the rotor and the number of split cores, and n is an integer).

A synchronous reluctance type rotary electric machine of an embodiment includes a shaft and a rotor core. The shaft rotates around a rotation axis. The rotor core is fixed to the shaft and includes multi-layered hollow parts having a convex shape toward a radially inward side formed for each pole in cross section. Then, when a center in a circumferential direction of one pole is a pole center, a hollow part closest to the shaft among the plurality of hollow parts is a first hollow part, a hollow part positioned next to the first hollow part is a second hollow part, and a hollow part positioned on a side opposite to the first hollow part with respect to the second hollow part is a third hollow part, a width W1 between the first hollow part and the second hollow part on the pole center and a width W2 between the second hollow part and the third hollow part on the pole center are set to satisfy W1W2.

The invention relates to an electric machine (1) comprising noise-reducing means (24) designed so as to obtain a resonance frequency of the electric machine within a resonance frequency range that does not match the range of frequency of the harmonics of the electric machine, more precisely between 1500 Hz and 2500 Hz.

According to one embodiment a synchronous reluctance rotating electrical machine of an embodiment has a shaft and a rotor core. The rotor core is fixed to the shaft, in which cavity portions being formed in a projected shape toward a radially inward direction are formed into multilayers for each pole and bridges are respectively formed between the cavity portions and an outer circumferential surface. The thickness of an outermost bridge positioned outermost on the pole end side among the plurality of bridges is formed to be gradually thicker from the pole center side toward the pole end side. Among the plurality of bridges, the thickness of an intermediate bridge positioned on the pole center side of the outermost bridge with one bridge interposed therebetween is formed to be gradually thicker from the pole end side toward the pole center side.

An AC electric machine that includes a dual magnetic phase material ring is disclosed. The AC electric machine includes a stator assembly and a rotor assembly positioned within the stator assembly and configured to rotate relative thereto, the rotor assembly comprising a rotor core including a stack of rotor laminations that collectively form the rotor core, the rotor core including a plurality of rotor poles separated by gaps therebetween. The AC electric machine also includes a dual magnetic phase material ring positioned about the stack of rotor laminations, the dual magnetic phase material ring comprising a first ring portion comprising a magnetic portion and a second ring portion comprising a non-magnetic portion.

A rotor mechanism includes a plurality of rotor bars and a rotor core. The rotor bars are disposed along the edge of the rotor core. The rotor core has a plurality of magnetic flux-barrier units and at least one flux channel. Each magnetic flux-barrier unit extends from one of the rotor bars to another rotor bar. The flux channel passes through the flux-barrier units and surrounds an axis of the rotor core, wherein each magnetic flux-barrier unit is a magnetic flux barrier, and the area between the adjacent magnetic flux-barrier units and the flux channel are pathways for magnetic flux.

A stator assembly has coils in a distributed winding configuration. A poly-phase switched reluctance motor assembly 3002 may include a stator assembly with multiple coils in a distributed winding configuration. The stator assembly may have a central bore into which a rotor assembly having multiple poles is received and configured to rotate. A method of controlling a switched reluctance motor may include at least three phases wherein during each conduction period a first phase is energized with negative direction current, a second phase is energized with positive current and there is at least one non-energized phase. During each commutation period either the first phase or second phase switches off to a non-energized state and one of the non-energized phases switches on to an energized state with the same direction current as the first or second phase that was switched off. The switched reluctance motor may include a distributed winding configuration.

An electrical motor comprising multiple inductive coils, and a method for using same, is disclosed. The inductive coils may be configured to conduct current bi-directionally. Terminals of the inductive coils may be coupled to a common node on a power bus coupled to a power supply. Current flowing in a first inductive coil from the power bus may be largely offset by current returned to the power bus from a second inductive coil.

A rotary electric machine includes a rotor that rotates around a rotation axis serving as a center and has a plurality of salient poles protruding in directions perpendicular to the rotation axis, and a stator that includes an annular structural body disposed radially outside the rotor and surrounding the rotor, and 6n windings provided along a circumferential direction of the structural body, a field signal for generating field magnetic flux and a drive signal for driving the rotor as a three-phase rotary electric machine being superimposed on each other to be input to each of the windings. n is a natural number equal to or larger than one.

The present invention provides a rotor, an axial flux electrical machine and a hybrid-electrical or electrical air craft. The rotor for the axial flux electrical machine comprises first sections of a first material and second sections of a second material. The first sections and second sections are arranged in alternating order and ring-shape. The arrangement is characterized by third sections which form interface areas between the first sections and second sections, whereas the third sections are comprising the first material and the second material in such a manner that the first section and the second section are connected force-fitted.