JPH10271782A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor comprising an annular stator having a teeth and a yoke and a troidal coil wound around each yoke in which the efficiency of the motor is enhanced by arranging rotor poles oppositely on the inner and outer circumferential sides of the stator core thereby increasing the flux interlinking in the stator yoke. SOLUTION: In the motor where a coil is wound troidally around a stator core having a teeth and a yoke, the stator core 1 is divided such that the teeth, 4, 5 are paired with a yoke 10. The teeth 4, 5 are formed on the inner and outer circumferential sides of the stator core 1 and rotor magnets 6, 8 are arranged to face the opposite sides of the teeth 4, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a toroidal winding.

[0002]

2. Description of the Related Art In a conventional toroidal motor, a rotor magnet faces only one of an inner peripheral portion and an outer peripheral portion of a stator core.
Japanese Patent Application Publication No. 1-35145 discloses a motor having a structure in which a rotor magnet is disposed on both sides of an inner peripheral portion and an outer peripheral portion of a stator core. In the structure of the previous example, the annular stator core 2
1, a coil 23 is wound annularly along the inner and outer circumferences, and the stator core 21 is connected to a shaft 28 via a bearing 29.
Is fixed to a non-magnetic base 25 which is pivotally supported. 2
A rotor yoke 24 is fixed to a shaft 28 such that a pair of annular permanent magnets 26 are coaxially arranged on both sides of the coil configuration 21 with an appropriate gap therebetween.
To be fixed to

[0003]

In the above-mentioned conventional configuration,
There were the following problems.

In the conventional toroidal wound twin rotor magnet structure, a coil is wound around an annular stator core. Therefore, since a rotor magnet is disposed facing the outer and inner circumferences of the coil, the stator is Since the distance from the core to the rotor magnet is long, the air gap between the rotor magnetic pole portion and the stator core is widened and the permeance of the magnet is reduced, so that a sufficient interlinkage magnetic flux cannot be obtained inside the stator core.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric motor capable of obtaining a highly efficient motor with a simple configuration.

[0006]

According to the present invention, there is provided an electric motor having an annular stator core body, a plurality of coil portions wound around the stator core body in a toroidal shape, and the plurality of coil portions being provided between the coil portions and the fixed portion. A tooth portion provided so as to protrude outward and inward from the child core body, and a rotor having an outer magnetic pole portion and an inner magnetic pole portion disposed to face outside and inside the tooth portion. The air gap between the magnetic pole and the magnetic pole can be reduced, and a highly efficient electric motor can be provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electric motor according to the present invention has an annular stator core body, a plurality of coil portions wound in a toroidal shape around the stator core body, and the stator core body between the coil portions. And a rotor having an outer magnetic pole portion and an inner magnetic pole portion disposed so as to face the outside and inside of the teeth portion, and a gap between the teeth portion and the magnetic pole portion. Can be reduced. Therefore, the magnetic flux easily passes through the space between the teeth portion and the magnetic pole portion.

Further, the tip of the teeth protruding outward and inward protrudes in the annular direction so as to cover the coil portion, so that the opposing surface of the teeth opposing the magnetic pole is increased.

Further, the plurality of yoke members having the teeth portion and the coil portion are connected to each other to form an annular stator core, so that the toroidal winding around the yoke portion can be easily performed.

Further, since the plurality of yoke members are connected by press-fitting, the connection surfaces are completely in close contact with each other, and there is no magnetic flux loss between the yoke members. In addition, materials that cannot be welded can be used.

Further, since the connecting portion of the plurality of yoke members has a hook shape, each yoke member is firmly fixed.

Further, since a plurality of yoke members are connected by welding, assembly becomes easy. Furthermore, since the bobbin is wound with the winding and the bobbin is inserted into the coil portion supporting portion of the yoke member, the bobbin can be easily mounted.

Further, by using a resin bobbin for the stator for fitting and assembling, a resin bobbin cannot be used in welding because the resin is melted by welding heat. By doing so, a resin bobbin can be used, so that assembly is easy.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings to facilitate understanding of the present invention. Note that the following embodiments are merely examples embodying the present invention, and do not limit the technical scope of the present invention.

(Embodiment 1) FIGS. 1 and 2 are plan views showing the cross-sectional structure of a motor having a toroidal winding twin rotor structure according to Embodiment 1. FIG. As shown in FIGS. 1 and 2, the stator core 1 includes a yoke 4 and a tooth 4 that separates a slot 2 in the rotation direction on the inner circumference side and a tooth 5 that separates the slot 3 in the rotation direction on the outer circumference side. The bobbin 12 in which the coil 11 is wound in a toroidal shape is inserted into each yoke 10 having a hook-shaped locking portion 13 into which the bobbin 12 of the annular stator core 1 composed of 10 can be inserted. This locking part 1
3 is press-fitted from the rotor shaft direction (front-rear direction in the figure) into a groove 14 formed on the divided ends of the teeth 4 and 5 of the divided core 15 serving as another yoke member.
The split cores 15 are connected in a ring shape.
With such a split core system, the space between adjacent teeth can be made as narrow as possible. because,
Since it is not necessary to pass the winding opening of the winding device between adjacent teeth, the size can be reduced to the limit. Therefore, the torque ripple is reduced, and the motor efficiency is improved by increasing the amount of interlinkage magnetic flux inside the stator core.

Reference numeral 7 denotes a rotor frame, which is fixed to a rotor yoke fixed to a shaft 9 so that a pair of cylindrical rotor magnets 6, 8 are coaxially arranged on both sides of the stator core 1 with an appropriate gap. .

(Embodiment 2) FIG. 3 is a plan view showing a longitudinal sectional structure of Embodiment 2. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 3, rotor magnets 6 and 8 are joined to rotor frame 7 and fixed relatively to stator core 1 so as to face the inner and outer circumferences. The rotor frame 7 is joined to a shaft 9, and the shaft 9 is a bearing 17 joined to a bracket 16.
To be rotatably inserted.

The stator core 1 has a coil bobbin 12
The bracket 18 is joined to the bracket 16 by a joining portion 18 formed at the bottom.

When the rotor magnets 6 and 8 are driven in two phases, the number of magnetized poles is equal to the number of slots (either the inner circumference or the outer circumference). Then, the rotor magnet 6 and the rotor magnet 8 are fixed to the rotor frame 7 such that the same poles face each other.

With the above configuration, the air gap between the stator core and the magnet can be reduced, and the magnet rotor is fixed at a position opposing both the inner and outer circumferences of the stator core. It is considered that about twice the flux linkage is obtained, and therefore the efficiency of the motor is improved.

In the second embodiment, a description has been given of the case of two-phase driving. However, the present invention is not limited to two-phase driving, and the same effect can be obtained in the case of multi-phase driving. Things. However, in the case of multi-phase driving, the relationship between the number of magnetized poles and the number of slots does not need to be the same, and it is necessary to design the number of magnetized poles to be optimum in consideration of other characteristics.

In this embodiment, the coil is wound around the coil bobbin. However, the coil is wound directly on the stator yoke using another insulating means such as an insulating film without using the coil bobbin. Also obtains the same effect.

Further, in this embodiment, the configuration in which the stator core 1 is divided is shown. However, the same effect can be obtained by using a stator core formed by integral molding without dividing the stator core 1. be able to.

Although the present embodiment has been described with respect to a brushless motor, the present invention is not limited only to a brushless motor, and a similar effect can be obtained for a motor having another structure such as an induction motor or a reluctance motor. Can be

[0025]

As described above, according to the first aspect of the present invention, since the magnetic flux easily flows through the air gap between the rotor magnetic pole and the stator core, the magnetic flux loss is reduced and the electric motor can be driven efficiently. .

Further, according to the second aspect of the present invention, since the surface facing the teeth portion can be widened, the flow of the magnetic flux is increased, the loss of the magnetic flux is reduced, and the motor can be driven more efficiently.

Further, according to the third and sixth aspects of the present invention, it is possible to arrange winding by winding a winding around the yoke member,
The space factor can be increased. Furthermore, since the gap between the teeth tips can be closed to the utmost, the gap between the teeth and the rotor becomes almost constant, and cogging torque is eliminated. In addition, since winding of the winding is easy, assembly can be facilitated.

Further, in the inventions according to the fourth and fifth aspects, the connection is made by press-fitting, and since the adhesion of the joint is high, there is no loss of magnetic flux generated by passing between the connected yoke members. Therefore, regardless of the split stator,
The electric motor can be efficiently driven. In addition, materials that cannot be welded because they are connected by press-fitting can be used.

Furthermore, in the invention according to claim 7, since winding is performed independently for each bobbin, aligned winding can be performed.
The space factor can be increased. Further, since the winding is performed by the bobbin alone, workability is improved.

Further, in the invention according to claim 8, a resin bobbin can be used, which facilitates assembly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same split core alone.

FIG. 3 is a longitudinal sectional view of a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional motor.

FIG. 5 is a longitudinal sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator core 2, 3 Slot 4, 5 Teeth 6 Rotor magnet 7 Rotor frame 8 Rotor magnet

Claims (8)

[Claims] An annular stator core body; a plurality of coil portions wound in a toroidal shape around the stator core body; and a plurality of coil portions located between the coil portions and extending outward and inward from the stator core body. An electric motor comprising: a teeth portion protruding in a direction; and a rotor having an outer magnetic pole portion and an inner magnetic pole portion disposed to face outside and inside the tooth portion. 2. A tip of a tooth portion protruding outward and inward protrudes in an annular direction so as to cover a coil portion.
An electric motor as described. 3. An electric motor according to claim 1, wherein an annular stator core is formed by connecting a plurality of yoke members each having a tooth portion and a coil portion. 4. The electric motor according to claim 3, wherein the plurality of yoke members are connected by press-fitting. 5. The electric motor according to claim 4, wherein the connecting portion of the plurality of yoke members has a hook shape. 6. The electric motor according to claim 3, wherein the plurality of yoke members are connected by welding. 7. The electric motor according to claim 3, wherein a winding is wound around the bobbin, and the bobbin is inserted into the coil portion supporting portion of the yoke member. 8. The electric motor according to claim 6, wherein a winding is wound around a resin bobbin, and the bobbin is inserted into a coil portion supporting portion of a yoke member.