A stator includes a hollow cylindrical stator core and a stator coil. The stator core has a plurality of slots formed therein. The stator coil is provided in the slots of the stator core in a plurality of layers in a radial direction of the stator core, and includes a first winding and a second winding. The first winding extends around the stator core so as to be located at the (2n−1)th and 2nth layers of the stator coil, and has an end located at the 2nth layer, where n is a natural number. The second winding extends around the stator core so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil, and has an end located at the (2n+1)th layer. The ends of the first and second windings, which are respectively located at the 2nth and (2n+1)th layers, are electrically connected to each other.

A stator includes a hollow cylindrical stator core and a stator coil. The stator core has a plurality of slots formed therein. The stator coil is provided in the slots of the stator core in a plurality of layers in a radial direction of the stator core, and includes a first winding and a second winding. The first winding extends around the stator core so as to be located at the (2n−1)th and 2nth layers of the stator coil, and has an end located at the 2nth layer, where n is a natural number. The second winding extends around the stator core so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil, and has an end located at the (2n+1)th layer. The ends of the first and second windings, which are respectively located at the 2nth and (2n+1)th layers, are electrically connected to each other.

Provided is a high-torque low-noise rotary electric machine. In a rotary electric machine, a jumper conductor having a normal slot pitch connects slot conductors by striding slots with a slot pitch “Np=N(=6)” in one of coil ends and striding slots with a slot pitch “Np=N(=6)” in the other coil end, assuming that the number of slots per pole is set to “N(=6).” The jumper conductor having an irregular slot pitch connects the slot conductors by striding slots with a slot pitch “Np=N+1(=7)” in one of the coil ends and striding slots with a slot pitch “Np=N−1(=5)” in the other coil end, assuming that the number of slots per pole is set to “N(=6).” The stator winding has a plurality of slot conductor groups consisting of a plurality of slot conductors having the same phase.

An electric machine may include an stator and a rotatable rotor. At least one of the stator or the rotor may include a plurality of multi-part trapezoidal teeth with an electromagnetic coil disposed around each tooth.

An electric machine includes a stator core defining circumferentially arranged slots alternating between odd and even slots. Each slot has radial pin positions arranged in adjacent pairs to define radial layers. A hairpin winding includes a first path of interconnected hairpins that is disposed in the stator core such that, for each of the radial layers, the first path is disposed in the odd slots and the even slots a same number of times.

An electric machine includes a stator core defining circumferentially arranged slots alternating between odd and even slots. Each slot has radial pin positions arranged in adjacent pairs to define radial layers. A hairpin winding includes a first path of interconnected hairpins that is disposed in the stator core such that, for each of the radial layers, the first path is disposed in the odd slots and the even slots a same number of times.

The present invention relates to a device (100) and a method for widening ends of legs of hairpin conductors arranged in slots of a stator core, and to a device (200) and a method for twisting ends of legs of hairpin conductors arranged in slots of a stator core. The device (100) for widening comprises at least one finger (111), preferably a plurality of fingers (111), for radially moving the ends of legs of hairpin conductors-said at least one finger (111) is arranged moveably in a radial inward and in a radial outward direction. Said at least one finger (111) is arranged moveably in an axial upward and in an axial downward direction. Said at least one finger (111) comprises at least one radially extending arm (101) and a separation member (102) being arranged adjacent to an, preferably radially inner, end of the arm (101). Said separation member (102) is designed for being positioned between two ends (5a, 5b) of radially neighbouring legs of pairs (6, 6′) of hairpin conductors. Said finger (111) has a first, preferably radially inner, section (104) adjacent to the separation member (102). Said first section (104) has a first radial width (114) dimensioned to receive at least one pair (6) of ends of legs and is adapted for moving said pair (6) of end of legs when the finger (111) is radially moved. Said finger (111) has a second, preferably radially outer, section (105), which does not overlap with the first section (104). Said second section (105) has a second radial width (116). Said first radial width (114) is smaller than the second radial width (116), and wherein said second section (105) is dimensioned to receive at least one pair (6) of legs without moving, when the finger (111) is radially moved.

The present invention relates to a device (100) and a method for widening ends of legs of hairpin conductors arranged in slots of a stator core, and to a device (200) and a method for twisting ends of legs of hairpin conductors arranged in slots of a stator core. The device (100) for widening comprises at least one finger (111), preferably a plurality of fingers (111), for radially moving the ends of legs of hairpin conductors-said at least one finger (111) is arranged moveably in a radial inward and in a radial outward direction. Said at least one finger (111) is arranged moveably in an axial upward and in an axial downward direction. Said at least one finger (111) comprises at least one radially extending arm (101) and a separation member (102) being arranged adjacent to an, preferably radially inner, end of the arm (101). Said separation member (102) is designed for being positioned between two ends (5a, 5b) of radially neighbouring legs of pairs (6, 6′) of hairpin conductors. Said finger (111) has a first, preferably radially inner, section (104) adjacent to the separation member (102). Said first section (104) has a first radial width (114) dimensioned to receive at least one pair (6) of ends of legs and is adapted for moving said pair (6) of end of legs when the finger (111) is radially moved. Said finger (111) has a second, preferably radially outer, section (105), which does not overlap with the first section (104). Said second section (105) has a second radial width (116). Said first radial width (114) is smaller than the second radial width (116), and wherein said second section (105) is dimensioned to receive at least one pair (6) of legs without moving, when the finger (111) is radially moved.

A radial flux electric machine includes a rotor configured to rotate about an axis of rotation, a plurality of electromagnetic coils, and a stator. The stator may have an annular stator ring and a plurality of core tooth-portions extending in a radial direction. The annular stator ring and the plurality of core tooth-portions may be integrally formed of a Soft Magnetic Composite (SMC). The SMC may include one or more isotropic ferromagnetic materials, a magnetic saturation induction of greater than or equal to about 1.6 Tesla, and an electrical resistivity greater than 10 micro-ohm/m.

A motor with a flat wire is provided. Since spatial collisions which occur in horizontal and vertical directions can be prevented by flat wire patterns which intersect with each other and are stacked on slots of a stator core, there is an advantageous effect in that a motor is miniaturized.