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

Definitions

• the present invention generally relates to alternators of the type that are used in
• this invention relates to an improved permanent magnet rotor
• the present invention is directed to a rotor for an electric machine
• each permanent magnet is positioned intermediate a pair of consecutive or successive independent poles.
• Each independent pole has a generally triangular cross-section that defines an apex
• Each permanent magnet has a first end for confronting the central opening, and a second end that forms a portion of the outer rotor perimeter.
• Each permanent magnet tapers from the first end to the second end. This particular
• the rotor of the present invention further comprises a pair of hubs.
• magnets and independent poles are positioned between the hubs.
• poles are attached to the hubs in such a manner that there is no interconnection
• the permanent magnets are formed from a magnetic material chosen from ferrite,
• the present invention is directed to rotor for an electric machine
• each permanent magnet is
• each independent pole has a first end portion that confronts the central opening and a
• each independent pole has a pair of lips that conform to the locally defined curvature of the outer rotor perimeter.
• Each permanent magnet has a first end for
• each independent pole abuts a
• centrifugal force produced by rotation of the rotor radially pushes each permanent
• permanent magnet has a reverse trapezoidal cross-section.
• each permanent magnet has a generally rectangular cross-section.
• FIG. 1 is an exploded view of a prior art permanent magnet rotor section.
• FIG. 2 is a top plan view of the poles depicted in FIG. 1.
• FIG. 3 is an exploded view of the permanent magnet rotor portion of the present
• FIG. 4 is a side elevational view of a permanent magnet depicted in FIG. 3.
• FIG. 5 is a view taken along line 5-5 of FIG. 4.
• FIG. 6 is a view taken along line 6-6 of FIG. 4.
• FIG. 7 is a perspective view of the permanent magnet of FIG. 4.
• FIG. 8 is a perspective view of the permanent magnet rotor section of the present
• FIG. 9 shows a portion of the permanent magnet rotor section shown in FIG. 8 and
• FIG. 9 A is a top plan view of a pole depicted in FIGS. 3, 8 and 9.
• FIG. 10 is a diagram that the illustrates properties of a focused flux path resulting
• FIG. 1 there is shown prior art rotor assembly 10. Assembly 10
• stator 10 When installed in an electric machine, rotor 10 rotates with respect to a stator (not
• ten (10) rotor field poles 18 radially extend from rotor core 20.
• Rotor 16 is fabricated from material having a high magnetic permeability. Rotor 16
• Rotor portion 50 generally comprises hubs 52 and
• 58 further includes axially extending openings 63 sized for receiving a corresponding
• Hubs 52 and 54 have threaded openings 64 for receiving bolts 62. Hubs 52
• Independent poles 58 and holding bolts 60 are fabricated from high magnetic permeability material.
• Each magnet 56 has end 66 which has a width Wl and end 68 which has a width W2
• Magnet 56 further includes a pair of sides, one of which
• poles 58 and the placement of each magnet 56 in the spaces between poles 58.
• each pole 58 is shaped as a disc sector and has a generally
• each magnet 56 is inserted in a corresponding space between each pair of consecutive or successive poles 58.
• end 68 of each magnet is generally on the outside diameter or circumference of the rotor 50.
• arrow 72 is substantially orthogonal to the radius of rotor 50.
• magnets 56 and poles 58 cooperate to prevent magnets 56 from
• centrifugal force is applied to magnets 56 and wedges and locks the diameter of rotor
• each pole 58 is a pole 58
• lips 75 and 76 also includes lips 75 and 76 in order to further secure magnets 56 and to eliminate
• an adhesive film is applied
• each magnet 56 and adjacent poles 58 can be used in place of magnets
• independent poles is generally rectangular shaped, and the independent poles have lips
• a preferred step in the assembly process of rotor 50 is to spin rotor 50 so as to
• FIG. 10 there is shown a graph of 0 vs. mmf (flux vs. magnetic
• R gap machine gap air reluctance
• R pgap parasitic air gap reluctance in between each magnet 56 and pole 58;
• R ⁇ k leakage reluctance present at the end of the magnets
• R mg0 internal magnet reluctance defined by magnet thickness
• each permanent magnet 56 is pushed radially by the
• rotor 50 can be used in any combination thereof.

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=22552479

Family Applications (1)

Country Status (4)

Cited By (9)

Families Citing this family (21)

Citations (6)

Family Cites Families (2)

• 2000
  • 2000-09-19 JP JP2001525825A patent/JP2003510998A/ja active Pending
  • 2000-09-19 WO PCT/US2000/025657 patent/WO2001022560A1/en active Application Filing
  • 2000-09-19 CN CN 00813143 patent/CN1205728C/zh not_active Expired - Fee Related
  • 2000-09-19 DE DE10084941T patent/DE10084941T1/de not_active Withdrawn

Patent Citations (6)

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