Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2706—Inner rotors
  • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
  • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
  • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
  • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
  • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
  • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
  • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

Definitions

• Rotating electric machine with a rotor limiting the magnetic flux losses, in particular electric motor.
• the present invention relates to a rotating electrical machine comprising a rotor housed in a stator and more particularly an electric motor.
• the rotor is formed of a rotor body carrying magnetic flux generators, such as permanent magnets, and supported by a rotor shaft.
• This rotor is generally housed inside a stator which carries electrical windings (or armature coils) for generating a magnetic field for rotating the rotor in association with the magnetic field generated by the magnets.
• the magnets are placed in closed radial housings evenly distributed circumferentially and extending throughout the axial dimension of the rotor body.
• These housings delimit between them radial polar expansions that can channel the magnetic flux from the magnets.
• the magnetic flux is not completely channeled by the polar expansions and there are still flux losses at the outer periphery of the rotor and more particularly at the outer ends of these expansions.
• the present invention proposes to overcome the aforementioned drawbacks by means of an electric machine whose flow losses are minimized at the level of the rotor.
• the present invention relates to an electric machine comprising a rotor and a stator, said rotor being formed of a rotor body with a stack of sheets and placed on a rotor shaft, said sheets having housing receiving generators magnetic flux and polar expansions located between the outer and inner edge of said sheets, characterized in that the pole expansions are connected by a connection bridge with the inner edge of said sheets.
• the sheets may comprise a connecting surface between the bridge and the inner edge.
• the bridge may comprise a circumferential dimension smaller than the circumferential dimension of the polar expansion.
• the bridge may comprise a circumferential dimension corresponding to about 10% of the circumferential dimension of the polar expansion.
• the bridge may comprise a dimension in height corresponding to approximately 10% of the height considered between the outer and inner edge of said sheets.
• the sheets may include an air space between two successive polar expansions and facing the housing.
• FIG. 2 which is a schematic view of an element of the rotor of FIG. 1, and
• a rotating electrical machine here an electric motor, comprises a rotor 10 and a stator 12 which, when mounted, are nested one inside the other while being coaxial while leaving the rotor free. in rotation.
• the rotor comprises, in a manner known per se, a shaft 14 on which is placed a stack of identical flat ferromagnetic sheets 16, which are joined to each other by any known means to form a rotor body 18.
• This rotor carries magnetic flux generators, here permanent magnets 20, which are, in the example shown, in the form of a bar of length substantially equal to the length of the stack of sheets.
• the stator also comprises a stack of identical flat ferromagnetic plates 22 which are interconnected by any known means, such as threaded tie rods 24, to form a tubular stator body 26.
• the annular periphery of the stator body comprises a plurality of radial notches of substantially rectangular section 28 open towards the central portion of this stator and extending throughout the periphery of the tubular stator. These notches are provided to receive the armature coils 30 which are fixed by any known means.
• Figures 2 and 3 which illustrate the configuration of a rotor plate 1 6.
• This sheet has a substantially annular configuration with a central bore 32, which receives the rotor shaft, and a planar peripheral surface ring 34 with an outer peripheral edge 36 and an inner periphery edge 38.
• the annular flat surface carries a succession of substantially rectangular radial housings 40 which are regularly distributed circumferentially on this surface for the reception of permanent magnets. These dwellings thus delimit between them radial polar expansions 42.
• the housings have a lower edge 44 at a distance from the inner edge 38 of the planar peripheral surface and an upper edge 46 spaced from the outer edge 36 of this planar peripheral surface.
• the polar expansions are connected to a connecting surface 47 between the inner edge 38 and the bottom 44 by a connecting bridge 48 of smaller circumferential dimension D pc than the smallest circumferential dimension D ep of the polar expansion and radial height H p corresponding to approximately 12% of the height of the flat surface 34 considered between the edges 36 and 38.
• the circumferential dimension D pc is about 10% of that of D ep .
• the bridge 38 comprises a radial bar 50 with a curved connection section 52 connecting the bar to the inner edge 44 of the housing which it is contiguous.
• this bridge comprises two convex surfaces 54 making it possible to connect this bridge to the radial edges 56 of the polar expansion, thus forming a spout 58 in the direction of the housing.
• this bridge makes it possible to form inverted T-shaped housings whose horizontal bar of the T is formed by the inner edge 44 and the convex surfaces 54 of two neighboring polar expansions and whose vertical bar is delimited. by the radial edges 56 of these polar expansions and the outer edge 46 of the housing.
• the circumferential dimension D pc is considered at the level of the bar 50
• the circumferential dimension D ep is considered at the tip of the beaks 58
• the height H p is taken between the top of the convex surface 54 and the inner edge 44 of the housing 40.
• the zone between the outer peripheral edge 36 and the outer edge 46 of the housing comprises a space 60, said air space.
• the permanent magnets are slid into the cavity thus formed by the housing and fixed by all known means.
• the rotor shaft is then mounted in the rotor body, then the assembly is housed in the stator to produce an electrical machine with the necessary elements, such as the collector, the connection flanges, ...
• the air space 60 between the polar expansions interrupts the transmission of the magnetic flux between two neighboring expansions, which can only limit the flow losses.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Permanent Field Magnets Of Synchronous Machinery (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=54608649

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Family Cites Families (4)

• 2015
  • 2015-06-29 FR FR1556066A patent/FR3038155B1/fr active Active
• 2016
  • 2016-06-28 JP JP2017563960A patent/JP2018519778A/ja not_active Withdrawn
  • 2016-06-28 US US15/738,477 patent/US20180191212A1/en not_active Abandoned
  • 2016-06-28 WO PCT/EP2016/064958 patent/WO2017001377A1/fr active Application Filing
  • 2016-06-28 EP EP16732638.8A patent/EP3314729A1/de not_active Withdrawn
  • 2016-06-28 CN CN201690000076.7U patent/CN207150278U/zh active Active

Also Published As

Similar Documents

Legal Events