JP2006074909A - Multishaft motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multishaft motor that allows the design and structure of the motor to be simplified. <P>SOLUTION: In this multishaft motor, left and right rotors 5 and 7 are placed in correspondence with each other in the axial direction with a stator 9 in-between. The stator 9 includes: a substantially disk-shaped stator body 11; multiple concentrated winding coils 13 for driving; and a core 15 formed of dust magnetic material. The left and right rotors 5 and 7 include substantially disk-shaped rotor bodies 25 and 27 and multiple permanent magnets 29 and 31. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multi-axis motor.

  As a conventional multi-axis motor, a radial motor in which two rotors are arranged inside and outside a cylindrical stator has been developed. That is, in this motor, the rotor and the stator are arranged to face each other in the radial direction.

  However, in a radial type multi-axis motor, since the inner and outer rotors have different diameters, the design of the stator and the rotor is complicated. In addition, when a large torque is to be obtained, it is necessary to support the stator and each rotor extending in the axial direction at both ends in the axial direction, so the design and structure of the bearing portion and the like are also complicated. is there.

  Therefore, the problem to be solved by the present invention is to provide a multi-axis motor that can simplify the design and structure of the motor.

  In order to solve the above problems, the invention of claim 1 is a multi-axis motor having a plurality of drive shafts, wherein a rotor fixed to each of the drive shafts and a stator are arranged facing each other in the axial direction. ing.

  According to a second aspect of the present invention, in the multi-axis motor according to the first aspect of the present invention, first and second drive shafts extending in opposite directions are provided as the plurality of drive shafts. A first rotor fixed to one drive shaft and a second rotor fixed to the second drive shaft are arranged to face each other with the stator interposed therebetween.

  Further, the invention of claim 3 is a multi-axis motor according to the invention of claim 2, wherein the magnetic core provided in the stator is a metal powder, or a powder obtained by bonding a metal magnetic powder covered with a predetermined film with a resin. It is formed of a magnetic material.

  According to the invention described in claim 1, since the rotor and the stator are arranged to face each other in the axial direction, the design and structure of each part of the motor such as the stator, the rotor, and the bearing portion can be simplified. The motor assembly process can also be simplified.

  According to the second aspect of the invention, the diameters of the first and second rotors provided on both sides of the stator can be set to be the same, and the design of the rotor and the stator can be simplified.

  According to the third aspect of the present invention, the dust magnetic material has excellent magnetic properties, has a small iron loss, can be easily formed by a mold, and has isotropic magnetic properties. The magnetic core provided in the stator can be easily formed, and by using this dust magnetic material, a magnetic circuit can be efficiently formed between the stator and the rotor facing in the axial direction, and the motor efficiency and output Etc. can be improved.

  FIG. 1 is an axial parallel cross-sectional view schematically showing a main part configuration of a multi-axis motor according to an embodiment of the present invention. As shown in FIG. 1, the multi-axis motor is fixed to left and right drive shafts (first and second drive shafts) 1 and 3 extending in opposite directions, and left and right drive shafts 1 and 3, respectively. This is a permanent magnet type synchronous motor configured to include left and right rotors (first and second rotors) 5 and 7 and a stator 9. The left and right rotors 5 and 7 are disposed so as to face each other in the axial direction with the stator 9 interposed therebetween.

  As shown in FIG. 2, the stator 9 includes a substantially disc-shaped stator body 11, a plurality of concentrated winding coils 13 for driving, and the same number of magnetic cores 15 as the coils 13, and a fixed portion 17 such as a casing. Fixed to.

  The stator body 11 is provided with a plurality of insertion holes 11a for inserting the coil 13 and the magnetic core 15 so as to penetrate in the axial direction at intervals in the circumferential direction. A through hole 11 b for supporting the left and right drive shafts 1, 3 is provided at the center of the stator body 7. Bearings 19 and 21 that pivotally support end portions of the left and right drive shafts 1 and 3 are fitted into the through holes 11b.

  As shown in FIG. 3, the coil 13 is formed by concentrically winding an elongated copper plate 23 having a rectangular cross section in an etchwise manner. The copper plates 23 wound and laminated are insulated by an insulating film or the like. The coil 13 thus configured is subjected to an insulation process such as an insulation coat. Such a coil 13 has the advantage that the electrical joint portion can be easily pulled out and the heat dissipation efficiency is better than that of a coil with thin wires.

  The magnetic core 15 is formed of a metal magnetic powder (for example, iron powder) or a powder magnetic material in which a metal magnetic powder (for example, iron powder) covered with a predetermined film (for example, phosphoric acid compound film) is bonded with a resin. Yes. For example, polyphenylene sulfide, soluble polyimide or other resin, or a mixture thereof is used as the resin for binding the dust magnetic material. The magnetic core 15 is formed by filling a predetermined magnetic mold material into a predetermined mold, pressurizing and compressing it, and then performing heat treatment.

  Such a dust magnetic material has excellent magnetic properties, has low iron loss, is easy to mold with a mold, and has isotropic magnetic properties. For this reason, the magnetic core 15 having a shape corresponding to the shape and size of the coil 13 can be easily formed.

  The stator body 11 may also be formed of a dust magnetic material.

  The assembly of the stator 9 is performed by fitting and fixing the coil 13 and the magnetic core 15 formed in advance in the insertion holes 11a of the stator body 11 from the axial direction. At this time, the magnetic core 15 fits exactly in the cavity on the inner peripheral side of the coil 13.

  After the coil 13 and the magnetic core 15 are fixed to the stator main body 11, electrical bonding between the coils 13 and the like, insulation processing (including semiconductive layer processing) of the bonding portion, and the like are performed. At this time, a connecting wire (not shown) and a drive circuit (not shown) for electrically connecting the coils 13 are provided on the inner peripheral side of the coil 13 in the stator body 11. For this reason, the outer peripheral part of the stator main body 11 can be used effectively as an arrangement space for the coil 13, and the motor can be reduced in size while maintaining the motor output.

  As shown in FIGS. 4 and 5, the left and right rotors 5, 7 include substantially disk-shaped rotor bodies 25, 27 and a plurality of permanent magnets 29, 31 attached to the rotor bodies 25, 27, respectively. Has been. A plurality of recesses (may be through holes) 25a and 27a for embedding the permanent magnets 29 and 31 are provided on the surfaces of the rotor main bodies 25 and 27 facing the stator 9 at intervals in the circumferential direction. . Through holes 25b and 27b into which the rotary shafts 1 and 3 are inserted and fixed are provided in the central portions of the rotor main bodies 25 and 27, respectively. The permanent magnets 29 and 31 are fitted and fixed in the recesses 25a and 27a. The diameters of the left and right rotors 5 and 7 are set to be the same. Further, the rotor bodies 25 and 27 may also be formed of the dust magnetic material.

  The left and right rotors 5 and 7 are driven by the interaction between the magnetic fields generated by the coils 13 of the stator 9 on the left and right sides of the stator 9 and the magnetic fields generated by the permanent magnets 29 and 31 of the rotors 5 and 7. Done.

  In this embodiment, the number of poles (number of magnets) provided in the left and right rotors 5 and 7 is set to a different value in order to realize independent driving of the left and right rotors 5 and 7. For example, eight permanent magnets 29 are installed in the left rotor 5 and driven by a magnetic field that generates a three-phase AC current, and four permanent magnets 31 are installed in the right permanent magnet and a six-phase AC current is generated. Is driven by a magnetic field generated. Correspondingly, the stator 9 is provided with 12 slots (11a). Moreover, the permanent magnets 29 and 31 of each rotor 5 and 7 are installed so that the polarity of N and S may be opposite to the adjacent permanent magnets 29 and 31 adjacent to the circumferential direction.

  Such a multi-axis motor is driven by combining a current component for driving the left rotor (for example, a three-phase AC current) and a current component for driving the right rotor (for example, a six-phase AC current) as shown in FIG. Then, it is performed by supplying the coil 13 of the stator 9. The frequency of the current component for driving the left and right rotors is set to a value different from each other corresponding to the pole arrangement of the corresponding left and right rotors 5, 7. The left and right rotors 5 and 7 can be driven independently without interfering with each other.

  As an application example of such a multi-axis motor, for example, it may be used for driving left and right wheels in a vehicle. In this case, there is an advantage that both the left and right wheels can be driven independently by one multi-axis motor.

  As another application example, it may be used for driving a disk-shaped recording medium such as a hard disk. In this case, there is an advantage that two recording media can be independently driven by one multi-axis motor.

  As described above, according to the multi-axis motor according to the present embodiment, the left and right rotors 5 and 7 are arranged corresponding to the axial direction with the stator 9 interposed therebetween. As a result, the design and structure of each part of the motor such as the stator 9, the rotors 5, 7, and the bearings (19, 21) can be simplified. The assembly process can be simplified.

  In addition, since the dust magnetic body has excellent magnetic characteristics, iron loss is small, shape formation by a mold is easy, and magnetic characteristics are isotropic, the magnetic core 15 provided on the stator 9 can be easily formed. By using this dust magnetic material, a magnetic circuit can be efficiently formed between the stator 9 and the rotors 5 and 7 facing each other in the axial direction, and the efficiency and output of the motor are improved. Can be planned.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axial parallel cross-sectional view schematically showing a main configuration of a multi-axis motor according to an embodiment of the present invention. It is a front view of the stator of the multi-axis motor of FIG. It is a perspective view of the coil used for the stator of FIG. It is a front view of the left rotor of the multi-axis motor of FIG. FIG. 2 is a front view of a right rotor of the multi-axis motor of FIG. 1. It is a figure which shows the electric current component supplied to the stator coil of the multi-axis motor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,3 Drive shaft 5,7 Rotor 9 Stator 11 Stator main body 13 Coil 15 Magnetic core 19, 21 Bearing 25, 27 Rotor main body 29, 31 Permanent magnet

Claims (3)

A multi-axis motor having a plurality of drive shafts,
A multi-axis motor, wherein a rotor fixed to each drive shaft and a stator are arranged to face each other in the axial direction. The multi-axis motor according to claim 1,
As the plurality of drive shafts, first and second drive shafts extending in opposite directions are provided,
A first rotor fixed to the first drive shaft and a second rotor fixed to the second drive shaft are arranged to face each other with the stator interposed therebetween. Shaft motor. The multi-axis motor according to claim 2,
A multi-axis motor, wherein a magnetic core provided in the stator is formed of a metal magnetic powder or a powder magnetic material obtained by bonding a metal magnetic powder covered with a predetermined film with a resin.

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