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Denso : Patent Issued for Rotary Electric Machine with Segment Type of Stator Winding (USPTO 9337693)

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05/19/2016 | 08:24pm CEST

By a News Reporter-Staff News Editor at Journal of Engineering -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventor Takahashi, Yuki (Obu, JP), filed on March 31, 2014, was published online on May 10, 2016.

The patent's assignee for patent number 9337693 is DENSO CORPORATION (Kariya, JP).

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to a rotary electric machine used in a vehicle, for example, as an electric motor or a generator, and in particular, to a rotary electric machine provided with a segmented type of stator winding.

"Rotary electric machines are used, for example, in vehicles. Such a rotary electric machine includes a rotor and a stator. A well-known stator includes a stator core which is arranged being radially opposed to the rotor and has a plurality of circumferentially arranged slots, and a stator winding which is wound about the stator core such that the conductors of the stator winding are accommodated in the slots and electrically connected to each other.

"For example, a patent document JP-A-2009-261189 discloses a stator winding having coil end portions axially projected out of both axial end faces of the stator core. Each of the coil end portions is formed into a staircase pattern to reduce the axial length of the coil end portion that does not operate in a magnetic-circuit manner.

"Recently, a small but high-power and high-quality rotary electric machine is sought for use as an electric motor or a generator. For a rotary electric machine installed in a vehicle, the space provided for it is becoming smaller and smaller, while the power of it is required to be enhanced more and more. In particular, a rotary electric machine used in a vehicle is arranged being coaxial with the dual mass flywheels, the engine, the gears and the like and hence there are more strict needs in reducing the size in the axial direction."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "Hence it is desired to provide a rotary electric machine with a stator winding whose coil end portions have smaller axial length to further ensure reduction of the size.

"An exemplary embodiment provides a rotary electric machine including a rotor arranged rotatably on a central axis, the central axis being defined as an axial direction, a radial direction extending radially from the central axis in a plane perpendicular to the axial direction, a circumferential direction being around the central axis in the plane; a stator provided with i) a stator core arranged to be opposed to the rotor with a gap between the stator and the rotor in the axial direction, wherein a plurality of slots are arrayed in the stator core in the circumferential direction and formed to have an opening opened toward the rotor, and ii) a stator winding wound at the stator core, the stator winding including a plurality of conductors each having in-slot portions, being electrically connected with each other, and having a rectangular section in a length-wise direction of each of the conductors, the in-slot portions being accommodated in a corresponding one of the slots of the stator core such that the in-slot portions are stacked therein in the radial direction and runs in the axial direction; and a wedge having two edges and a length ranging from one of the edges to the other, wherein the wedge is inserted between the in-slot portions stacked in each of the slots and a wall of each of the slots such that both end portions of the conductors are tilted relative to the rotor so as to be oriented oppositely to the rotor in the radial direction, the wall being located oppositely to the opening, the tilted end portions starting from each of the two edges of the wedge in the axial direction, the length of the wedge being smaller than an axial length of the stator core in the axial direction.

"According to the configuration, both axial end portions of the plurality of the conductors, whose in-slot portions are stacked in each slot in the radial direction, are tilted so as to be oriented oppositely to the rotor, starting from respective axial edges of the wedge. Thus, coil end portions of the stator winding, which are axially projected out of both axial end faces of the stator core, will have an axial height that can be reduced according to the angle of tilting (tilting angle) of both axial end portions of the conductors. Accordingly, the overall length of the stator, which is composed of the axial length of the stator core and the axial height of the coil end portions, is reduced to thereby reduce the size of the stator.

"In the present invention, the wedge inserted into each slot has a length equal to or smaller than the axial length of the stator core. As the axial length of the wedge is reduced (as the position of each axial end portion of the wedge comes closer to the axial center of the slot), the starting point at which the axial end portions of the conductors are tilted also comes closer to the axial center of the slot. Therefore, the tilting angle of the axial end portions of the conductors is increased and hence the axial height of each coil end portion is decreased. However, a maximum tilting angle is achieved when the tilted axial end portions of the conductors come into contact with a corner (edge) of each axial end portion of the slot. Therefore, the maximum tilting angle depends on the radial length (thickness) of the wedge.

"The reference symbols in brackets for the elements set forth above or in the claims indicate correlation of the elements to the specific means described in the embodiments provided below."

For additional information on this patent, see: Takahashi, Yuki. Rotary Electric Machine with Segment Type of Stator Winding. U.S. Patent Number 9337693, filed March 31, 2014, and published online on May 10, 2016. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9337693.PN.&OS=PN/9337693RS=PN/9337693

Keywords for this news article include: DENSO CORPORATION, Auto Part Companies.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2016, NewsRx LLC

(c) 2016 NewsRx LLC, source Science Newsletters

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