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
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
  • H02K21/02—Details
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
  • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
  • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
  • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/02—Permanent magnets [PM]
  • H01F7/0205—Magnetic circuits with PM in general

Definitions

• the present invention relates to the field of brushless electric rotary machines of the type with permanent magnet rotor (IPM or "interior permanent magnet” in English) to reduce the amount
• the electric machine can be of the motor type or of the generator type.
• the rotor is constituted by a stack of ferromagnetic laminations of generally annular rotor shape having a substantially circular section provided, at a central portion, with a shaft insertion hole through which extends a rotation shaft.
• the rotor lamina package is provided at an outer circumferential side with substantially rectangular magnet insertion holes in which parallelepipedic main magnets are inserted.
• Japanese Patent Application JP2016163462 discloses a brushless electric machine with an inner permanent magnet rotor.
• the rotor of this known solution consists of a tubular core with an outside diameter D ext and an inside diameter Di nt .
• the core has N pairs of longitudinal housings with trapezoidal cross section.
• the two housing on the one hand housing extends on either side of the median radial plane.
• pairs of one pair extend on both sides of the median radial plane with an angle
• the magnets are positioned in a preferred range of angular orientation relative to the main flow path of the machine to maximize the magnetic flux density in the core without exceeding the core saturation flux density.
• the ratio of the flux density of the magnets to their maximum energy point and the core saturation flux density determines the preferred range of magnet retention angles.
• German Patent Application DE19915664 discloses an electric machine comprising a stator and at least one
• This stack of sheets is characterized in that the sheets of the stack have at least two different cut parts, and in that at least the sheets of a cut portion are provided with means which cause, especially when the individual sheets are axially assembled, a locking in the radial direction of these sheets inside the stack.
• the accommodations present a section close to a trapezoidal shape, but without a longitudinal channel in the convergence zone of each pair of housing.
• the present invention relates, according to its most general meaning, to an electric machine without brushes with an inner permanent magnet rotor, characterized in that the rotor is
• longitudinals having a trapezoidal cross-section, having a width l a and a median length L, with l a / L being between 0.25 and 0.35, the two housings of a pair extending from one side to the other other of the median radial plane, with an angle of 7.5 ° ⁇ 1.5 °, said core having in the convergence zone of each pair of housing a longitudinal channel opening on either side of the front ends of the core.
• width is meant the distance measured between the two bases of the trapezoidal section. These two bases are parallel, and form with the radial direction of the rotor the angle of 7.5 ° ⁇ 1.5 °.
• median length is meant the distance measured between the two sides connecting the two abovementioned bases, at an axis parallel to said bases and passing in the middle of the line perpendicular to the two bases.
• said core is constituted by a stack of ferromagnetic sheets.
• said housings open at the outer periphery of said core into notches of width less than the width of said notches.
• the cross section of said channels is between 0.8 and 1.2 times the width of said housing.
• the magnets are alternately magnetized in opposite directions.
• the rotor comprises alternations of pairs of adjacent magnets magnetized in the same direction.
• N is greater than or equal to 12.
• the stator has kN teeth where k is an integer or fractional number, said longitudinal teeth extending radially towards the rotor, from an outer annular yoke, at least a portion of said longitudinal teeth being surrounded by a electrical coil.
• the stator has kN teeth where k is an integer or fractional number, said teeth being twisted and extending radially towards the rotor from an outer annular yoke, at least a portion of said twisted teeth being surrounded by an electrical coil.
• the rotor is twisted at a multiple angle of the stator tooth half-step.
• FIG. 1 represents a perspective view of a first exemplary embodiment of a rotor for a machine according to the invention
• FIG. 2 represents the map of the magnetic field lines corresponding to this first exemplary embodiment.
• FIG. 4 represents the map of the magnetic field lines corresponding to this second exemplary embodiment
• FIG. 5 represents a transverse perspective view of a second embodiment of a stator for a machine according to the invention.
• FIG. 6 represents the curve of the
• FIG. 1 represents a perspective view of a first exemplary embodiment of a rotor for an electric machine according to the invention.
• the rotor consists of a core (1) of tubular shape having 6 pairs of poles.
• the core (1) has longitudinal housing pairs (2, 3) passing through the rotor core along its entire length.
• the housings (2, 3) of a pair form a "V", their transverse median plane each forming with the median plane (4) passing through the housing an angle of 1.5 °.
• the angle formed between the transverse median planes of two consecutive housings (2, 3) is therefore 15 °.
• the housings (2, 3) open at the outer peripheral surface of the rotor, through openings (5, 6) of width less than the width of the housing (2, 3) to form on either side of the median plane of housings (2, 3) of the magnet retention beads introduced into these
• Permanent magnets in the form of trapezoidal bars are introduced into these housings (2, 3).
• the magnets of a pair of housings are magnetized in opposite directions.
• adjacent ones receive magnets of the same direction of magnetization.
• the inner faces (12, 13) of the magnets inserted in the housings (2, 3) are chamfered.
• the nucleus presents facing these chamfers longitudinal channels (10) passing through the rotor.
• These longitudinal channels (10) reduce magnetic leakage. They also make it possible to circulate air or a cooling fluid of the rotor.
• the brushless electric machine consists of a tubular core (1) with an outside diameter D ext and an inside diameter
• the core (1) has N pairs of housing (2, 3) extending longitudinally.
• the cross section of its housing is trapezoidal, the parallel bases of the trapezium extending in a direction that is almost radial.
• the parallel bases of the trapezium form with the radial direction an angle which is preferably about 1.5 °.
• the two adjacent houses form, in cross-sectional view, a V extending on either side of the radial plane passing through the housing.
• the core has in the convergence zone of each pair of housings (2, 3) a longitudinal channel (10) opening on either side of the front ends of the core (1), and located in the vicinity of the inner periphery of the core .
• Permanent magnets in the form of trapezoidal bars corresponding to the shape of the housings (2, 3) are introduced into said housings (2, 3).
• the inner faces (12, 13) of said magnets are chamfered.
• FIG. 2 represents the map of the magnetic field lines of a 12-pole motor corresponding to this first embodiment.
• FIG. 3 represents an alternative embodiment, with a core structure identical to that of the first example illustrated in FIG. 1.
• the magnets are magnetized in alternate directions, whereas in the previous example, two consecutive magnets had the same magnetization.
• FIG. 4 represents the map of the magnetic field lines of a 24-pole motor corresponding to this second embodiment.
• the stator illustrated in FIG. 5, is constituted by an annular yoke (20) having 72 teeth (21) extending radially. These teeth are surrounded by coils (22) fed alternately.
• these teeth extend not longitudinally but helically, with a twisting of a few degrees between the two front ends of the stator.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=58162796

Family Applications (1)

Country Status (6)

Family Cites Families (14)

• 2016
  • 2016-12-01 FR FR1661770A patent/FR3059849B1/fr active Active
• 2017
  • 2017-11-27 CN CN201780074438.6A patent/CN110249503A/zh active Pending
  • 2017-11-27 EP EP17812028.3A patent/EP3549238A1/de not_active Withdrawn
  • 2017-11-27 JP JP2019529496A patent/JP2019536418A/ja active Pending
  • 2017-11-27 WO PCT/FR2017/053258 patent/WO2018100276A1/fr not_active Ceased
  • 2017-11-27 US US16/465,507 patent/US10530206B2/en active Active

Also Published As

Similar Documents

Legal Events