The present disclosure provides a method for improving the computational efficiency of an electromagnetic transients program (EMTP-type) phase domain synchronous machine model. The method comprises: acquiring a traditional phase domain synchronous machine model; acquiring matrix relations between mutual inductance matrices of stator windings and rotor windings according to a trigonometric transformation equation; substituting the matrix relations into the original expression of R.sub.eq and the original formulation of e.sub.h(t), respectively, and deriving to obtain a simplified formulation of the equivalent resistance matrix R.sub.eq and a simplified formulation of the total history term e.sub.h(t); and acquiring an efficient phase domain synchronous machine model. According to the embodiment of the disclosure, in the provided model, the equivalent resistance matrix of the phase domain synchronous machine model and the matrix used in the calculation of the history term are converted into constant sparse matrices, thereby improving the calculation efficiency of the model.

According to an embodiment, a rotating electrical machine includes a rotor and a stator. The rotor includes a first coil, first magnetic poles and second magnetic poles. The stator includes a second coil, third magnetic poles and fourth magnetic poles. One of a first magnetic pole and a second magnetic pole opposite to the first magnetic pole is formed such that a leading end of the one of the first magnetic pole and the second magnetic pole lies opposite a central portion of an opposite surface of the stator. One of a third magnetic pole and a fourth magnetic pole opposite to the third magnetic pole is formed such that a leading end of the one of the third magnetic pole and the fourth magnetic pole lies opposite a central portion of an opposite surface of the rotor.

An outer rotor type dynamo has a first magnet and a second magnet which are disposed apart from each other in the axial direction, a first stator yoke disposed facing the inside of the first magnet with a gap, a second stator yoke disposed faced the inside of the second magnet with a gap, a hub shaft which magnetically connects the first stator yoke and the second stator yoke, a comb-like yoke in which both end portions of a plurality of projection pieces extending along the axial direction face different magnetic poles with respect to the first magnet and the second magnet, a bobbin disposed between the first stator yoke and the second stator yoke, and a coil wound around the bobbin.

Disclosed are various embodiments for electric machines with fractional concentrated winding having a coil winding assembly with at least a first and a second laminated stator pole segment, each of the laminated stator pole segments having the shape of a tapered H and mechanically joined together to form a ring-like stator core with a plurality of circumferentially distributed stator poles and slots for coils, the first and second stator pole segments comprising a plurality of laminated stator pole segment pieces oriented in a radial direction and coupled together to form a unified stator pole segment with a 3D flux path, and wherein the laminations of each of the laminated stator pole segment pieces has the shape of a U.

To provide an actuator in which an unstable movement of a rotor is controlled. An actuator includes a coil, a bobbin around which the coil is wound, a rotor positioned inside the bobbin, a shaft to which the rotor is fixed and which is rotatably supported, a stator including a base portion positioned on one end side of the shaft, outer magnetic pole portions extending from the base portion along the shaft and positioned outside the bobbin and inner magnetic pole portions extending from the base portion along the shaft and positioned between the rotor and the inside of the bobbin, a stator including a base portion positioned on the other end side of the shaft, outer magnetic pole portions extending from the base portion along the shaft and positioned outside the bobbin and inner magnetic pole portions extending from the base portion along the shaft and positioned between the rotor and the inside of the bobbin and a cover positioned between the rotor and the stator and contacting tip portions of the inner magnetic pole portions to regulate the approach of the inner magnetic pole portions to the rotor.

Provided is a transport device in which reliability is increased by suppressing deterioration of the transport surface and transport efficiency is increased by suppressing electrical current loss. A transport device 1 comprising a transported body having either a permanent magnet 10 or a magnetic body, and an electromagnet unit in which coils 21 are wound around teeth 25 comprising magnetic bodies, and having recesses on surfaces of the teeth 25 facing the transported body. Specifically, the surfaces of the teeth 25 facing the transported body have at least two surfaces (first facing surface 22, second facing surface 23, etc.) which have different distances to the transported body.

Disclosed is a single phase brushless direct current motor comprising a stator and a rotor which is rotatably located inside the stator, the stator comprising: a first stator core having a plurality of first core pieces which are formed to be bent from the inside; a second stator core having a plurality of second core pieces which are located between the first core pieces, respectively, and are formed to be bent from the inside; and a bobbin which is coupled between the first stator core and the second stator core, and around which a coil is wound, and the rotor comprising: a rotor body which rotates around a shaft; and a plurality of magnets which are formed on the outer circumferential surface of the rotor body, wherein the first core pieces and the second core pieces have overlapping regions which axially overlap when seen from the shaft.

Disclosed is a single phase brushless direct current motor comprising a stator and a rotor which is rotatably located outside the stator, the stator comprising: a first stator core having a plurality of first core pieces which are formed to be bent from the outside; a second stator core having a plurality of second core pieces which are located between the first core pieces, respectively, and are formed to be bent from the outside; and a bobbin which is coupled between the first stator core and the second stator core, and around which a coil is wound, and the rotor comprising: a cup-shaped rotor body which rotates around a shaft; and a plurality of magnets which are formed on the inner circumferential surface of the rotor body, wherein the first core pieces and the second core pieces have overlapping regions which axially overlap when seen from the magnets.

The invention concerns a windmill including a rotatable transverse flux electrical machine (TFEM) comprising a stator portion; and a rotor portion rotatably located in respect with the stator portion, the rotor portion including an alternate sequence of magnets and concentrators radially disposed about a rotation axis thereof; the stator portion including at least one phase, the at least one phase including a plurality of cores cooperating with a coil disposed about the rotation axis, each core including a skewed pair of poles to progressively electromagnetically engage an electromagnetic field of respective cooperating concentrators. The invention is also concerned with a plurality of elements located in desired positions in the TFEM.

An electric motor includes: a case; a stator including a stator core disposed inside the case and a stator coil wound around the stator core; a rotor including a rotating shaft and being configured to rotate with respect to the stator; and an oil spraying part that is configured to store oil in a lower part of the case, that includes an oil passage configured to guide the oil to an upper area of the case and an oil pump for pumping the oil, and that is configured to spray the oil to an inner heating part of the case. Accordingly, the oil can suppress occurrence of short-circuiting of an electric circuit and rapidly cool a heating part.