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
  • H02K1/278—Surface mounted magnets; Inset magnets
• • 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
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
  • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/46—Fastening of windings on the stator or rotor structure
  • H02K3/47—Air-gap windings, i.e. iron-free windings

Definitions

• the present invention relates to a brushless DC motor used as a drive motor in industrial fields such as FA or OA, or a drive motor of an electric vehicle, and more particularly to an annular stator without magnetic salient poles (slots).
• the present invention relates to a smooth armature-coil linear motor, V, a so-called gap winding type motor, in which an armature coil for forming a rotating magnetic field is attached to a core.
• 1 is the frame
• 2 is the stator core
• 3 is the air-core coil
• 4 is the permanent magnet
• 5 is the N pole of the permanent magnet
• 6 is the S pole of the permanent magnet
• 7 is the gap between the permanent magnets
• 9 Is a rotor core
• 10 is a shaft
• 11 is a magnetic air gap.
• the stator of the gap winding motor is composed of a stator core 2 formed in a cylindrical shape by laminating silicon steel plates, and a thin insulation provided on the inner peripheral surface of the stator core 2 to ensure a required withstand voltage. It consists of 15 armature wires, each of which is equipped with a plurality of air-core-shaped coils 3 for forming a rotating magnetic field concentrated through layers, at equal intervals. This armature wire is molded or impregnated with resin and fixed integrally with the stator core 2.
• the rotor is disposed concentrically with the stator via the magnetic gap 11 and fitted to the outer peripheral surface of the shaft 10 and fixed to the rotor core 9.
• a plurality of magnetic poles having different polarities alternately, and composed of, for example, a rare earth permanent magnet 4 divided in an arc shape, 1137731973970—0
• the rotor is rotatably supported between the stator and the stator via a non-illustrated bearing.
• the N-pole 5 and S-pole 6 magnets that constitute the permanent magnet 4 are bonded and fixed to the outer periphery of the rotor core 9 at regular intervals with a fixed gap 7 by a jig or the like.
• the number of permanent magnets is a force determined by the basic slot combination. In general, when the volume of the electromagnetic part is to be minimized, the number of magnetic poles is large. (For example, see Patent Documents 1 and 2).
• Patent Document 1 Japanese Patent Application Laid-Open No. 2002-159152 (Specification, page 3, FIG. 1)
• Patent Document 2 Japanese Patent Laid-Open No. 2002-191146 (Specification, page 2, Fig. 1)
• the number of permanent magnets further increases because the required number of magnetic poles increases as the outer diameter increases. If the number of permanent magnets is increased and subdivided, the volume of the permanent magnet itself becomes smaller.In general, however, the small volume of the magnet alone causes an increase in cost, and the mounting work when the magnet is positioned and bonded to the rotor or bonded. The inspection after installing the magnet required a lot of time, and productivity was bad. In addition, when the number of magnets increased, there were problems related to reliability as soon as the effects of shape errors and magnet mounting errors of the magnet itself were picked up.
• the present invention has been made in view of such problems, and enables the permanent magnets to be increased in volume and quantity halved.
• the present invention aims to reduce costs, shorten the bonding time, and improve workability and reliability.
• An object of the present invention is to provide a gap winding motor having an excellent rotor structure.
• the present invention is configured as follows.
• the invention according to claim 1 comprises a cylindrical stator core and a plurality of air-core-shaped coils for forming a rotating magnetic field on either the inner peripheral surface or the outer peripheral surface of the stator core.
• a stator composed of armature windings, a rotor core disposed concentrically with the stator and a magnetic gap between the stator core, and a plurality of poles alternately provided with different polarities
• the single piece of the plurality of divided permanent magnets has N poles. It is characterized by having an N-pole magnetized part and an S-pole magnetized part that have two-pole magnetized.
• the invention according to claim 2 is the gap winding type motor according to claim 1, wherein a non-magnetized part for suppressing cogging is provided between the N pole magnetized part and the S pole magnetized part. Characterized by things! /
• the number of permanent magnets can be halved, the time required for the mounting work when the permanent magnets are bonded to the rotor core or the inspection after mounting the magnets can be reduced. Productivity is improved. In addition, by reducing the number of magnets by half, it is possible to reduce errors in the shape of individual magnets and errors in mounting magnets, improving reliability. Further, since the bonding area per permanent magnet increases, the bonding strength increases and the reliability improves. Furthermore, since the weight per permanent magnet increases, the cost can be reduced. According to the second aspect of the invention, the balance between the N pole and the S pole by the permanent magnet becomes uniform at any position, and the cogging torque can be suppressed.
• FIG. 1 is a front sectional view of a gap winding motor showing a first embodiment of the present invention.
• FIG.2 Enlarged front sectional view of the electromagnetic part of the gap winding motor of Fig.1
• FIG.3 Front sectional view of a conventional gap winding motor
• FIG.4 Enlarged front sectional view of the electromagnetic part of the gap winding motor of Fig.3
• FIG. 1 is a front sectional view of a gap winding motor showing a first embodiment of the present invention
• FIG. 2 is an enlarged front sectional view of an electromagnetic part of the gap winding motor of FIG.
• an example of an inner rotor type gap winding motor having 20 poles and 15 coils is shown. Note that the description of the same components as those of the prior art will be omitted, and only the differences will be described.
• the present invention is different from the prior art as follows.
• the single unit of the permanent magnet 4 divided into two is magnetized with N-pole and S-pole two-pole magnetization, and has N-pole magnetized part 5 and S-pole magnetized part 6. This is because a non-magnetized part 8 is provided between the magnetic part 5 and the S pole magnetized part 6 to suppress cogging.
• FIGs. 1 and 2 an example of an inner rotor type gap winding motor with 20 poles of the magnetic field and 15 coils of the armature is shown, and the slot combination is also shown.
• the permanent magnet 4 of this example which is different from the conventional technology, has a total of 10 divided magnets and 1 divided magnet corresponds to 2 poles. Only changes.
• the rotor cleans the surface and fits the rotor core 9 formed of laminated steel plates on the shaft.
• an adhesive (not shown) is attached to the rotor core 9.
• the magnet can be magnetized either by directly bonding the divided magnets magnetized before bonding to the shaft or by magnetizing after magnetizing the unmagnetized divided magnets to the shaft.
• the surface magnet type rotor Therefore, a non-magnetized part 8 is provided between the N-pole magnetized part 5 and the S-pole magnetized part 6 of the one-part magnet constituting the permanent magnet so that the cogging torque is minimized.
• a plurality of divided permanent magnets 4 may be displaced in the circumferential direction along the axial direction of the rotor so as to have a skew.
• the surface magnet type rotor receives a large centrifugal force like a motor for high speed rotation, as a fixing method to obtain strength, it is thin on the outer periphery of the permanent magnet placed and fixed on the rotor surface. It is also possible to adopt a method of pressing and fixing the ring member or a method of fixing with a wedge between permanent magnet gaps arranged at equal intervals.
• thin-walled ring members include materials with high tensile strength, such as carbon fiber reinforced plastic (CFRP) and titanium. If these can be molded into a ring shape and press-fitted onto the rotor surface, a higher speed can be achieved. Rotation is achieved, motor characteristics are improved, and manufacturing is easy.
• CFRP carbon fiber reinforced plastic
• the gap winding motor of the present invention increases the volume of the permanent magnet!
• a drive motor in industrial fields such as FA or OA, Or, it can be applied to brushless DC motors used as drive motors for electric vehicles.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Permanent Field Magnets Of Synchronous Machinery (AREA)
• Permanent Magnet Type Synchronous Machine (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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ID=38287676

Family Applications (1)

Country Status (3)

Cited By (6)

Families Citing this family (1)

Citations (2)

• 2007
  • 2007-01-19 WO PCT/JP2007/050748 patent/WO2007083724A1/ja not_active Ceased
  • 2007-01-19 TW TW096102412A patent/TW200746589A/zh not_active IP Right Cessation
  • 2007-01-19 JP JP2007554963A patent/JPWO2007083724A1/ja active Pending

Patent Citations (2)

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