Patents Examined by Tran Ngoc Nguyen
  • Patent number: 5747902
    Abstract: A completely novel rotary apparatus is provided which can rotate a composite rotor at a high speed by utilizing the magnetic force, the composite rotor being comprised of a plurality of ring-shaped rotors arranged concentrically with each other.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: May 5, 1998
    Inventor: Muneaki Takara
  • Patent number: 5739614
    Abstract: A two-phase unipolar driving brushless DC motor of a radial gap type having a rotor position detector includes a main-pole yoke having main-poles, an interpole yoke coaxially provided with the main-pole yoke in a superposed manner and having interpoles and an axial short-circuit portion or member provided in an axially extending portion in magnetic fluxes formed in the main-poles and interpoles. This structure allows for easy winding of coils around the main-poles and enhanced winding space factor in order to increase the starting torque and to improve the motor efficiency.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: April 14, 1998
    Assignee: Minebea Co., Ltd.
    Inventors: Yuzuru Suzuki, Sakae Fujitani, Kenichi Makino
  • Patent number: 5731647
    Abstract: A hybrid-energized synchronous machine includes a laminated stator core that is arranged in a magnetic yoke and is divided axially into at least two core halves between which there is a field coil, where the rotor of this machine is also divided in two halves, where each rotor half has pole parts that are provided with permanent magnets and those that are not provided with permanent magnets, where one rotor half is equipped with permanent magnets of one polarity (N) and the other rotor half is equipped with permanent magnets of the other polarity (S), and pole parts of both rotor halves that are equipped with permanent magnets are offset by one pole pitch with respect to each other. The synchronous electric machine is also provided with an electric field coil designed as a ring coil. Both scattering losses and line losses can be reduced due to the fact that rotor halves are arranged on rotor shaft with an axial distance between them, and field coil is inserted into the space between rotor halves.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: March 24, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Uwe Schuller, Jurgen Brandes
  • Patent number: 5698925
    Abstract: Each stator lamination (2) is angularly offset with respect to the following adjacent lamination, about an axis (4) of the stator (1, 3), by a constant angle (.alpha.) equal to a multiple of the angle corresponding to the slot pitch, and has a square shape, each corner (5) being truncated to a circular outline (6). At least one of the two truncated corners (5) of each lamination (2) is linked to the corner (5) corresponding to each of the two adjacent laminations (2) by at least one welding point (11) located in a region where the two outlines (6) extend or are superimposed. The welding points (11) are located in predetermined respective angular positions cyclically reproducible in relation to the stator axis (4) and are uniformly distributed about the axis (4) so that the welding points (11) are aligned according to lines (15a, 15b) of welding points (11) substantially parallel to the stator axis (4).
    Type: Grant
    Filed: March 7, 1996
    Date of Patent: December 16, 1997
    Assignee: Moteurs Leroy-Somer
    Inventor: Eric Coupart
  • Patent number: 5691586
    Abstract: The present invention relates to a system for driving two mechanical members in rotation about an axis by magnetic coupling of the attractive type, the system comprises respective magnetic elements secured to each of said mechanical members, the two magnetic elements being concentric, one of them being made up of two identical magnetic rings of minimum radius R.sub.3 and of maximum radius R.sub.4, and the other one of them being made up of a magnetic ring having a minimum radius R.sub.1 and a maximum radius R.sub.2, with its midplane perpendicular to the axis of rotation being offset by a distance d from the midplanes of each of said two identical rings. Each ring possesses magnetization in a direction contained in a plane that is perpendicular to the axis of rotation. Each ring also possesses N magnetic poles uniformly distributed around said axis of rotation. The ratio 2d/.vertline.(R.sub.3 +R.sub.4)-(R.sub.1 +R.sub.2).vertline. lies in the range 0.2 to 0.8.
    Type: Grant
    Filed: January 13, 1995
    Date of Patent: November 25, 1997
    Assignee: Schlumberger Industries, S.A.
    Inventors: Jean-Paul Yonnet, Jerome Delamare
  • Patent number: 5679994
    Abstract: An electric rotating machine and manufacturing method of the same is provided that can securely press-fit magnetic poles against an inner circumference of a yoke with a cylindrical body. By directly contacting a first and second end portions of the cylindrical body and moving the same relatively, the diameter of the cylindrical body widens in the outer radial direction to press-fit the magnetic poles against the inner circumference of the yoke. Thus, the variation of the inner diameter of the magnetic poles that occurs due to the dimensional error in permanent magnet thickness and inner diameter of the yoke is absorbed by the relative movement of the first and second end portions. This stabilizes the fixing force of the magnet, and allows the magnet to be securely fixed to the yoke without excessive stress on the cylindrical body. Furthermore, the displacement of the magnetic poles can be restricted by bending axial ends of the cylindrical body radially outwardly.
    Type: Grant
    Filed: January 5, 1995
    Date of Patent: October 21, 1997
    Assignee: Nippondenso Co., Ltd.
    Inventors: Tsutomu Shiga, Nobuyuki Hayashi, Masanori Ohmi, Masami Niimi