KR101348636B1 - Stator of transverse flux electric machine having multi-phase in circumferencial direction - Google Patents

Abstract

The present invention relates to a stator of a traverse flux electric device forming a circumferential multi-phase distribution, capable of effectively solving a traditional problem such as degradation of productivity, device performance or characteristics caused by using an SMS core or a laminated core as a stator core in the traverse flux electric device forming the multi-phase distribution in a circumferential direction. To attain the purpose, provided is the stator of the traverse flux electric device forming the circumferential multi-phase distribution comprising a stator core including: an upper gear core forming an upper gear arranged such that coil wirings with multiple phases are alternately wound around a circumferential direction; a lower gear core forming a lower gear arranged such that coil wirings with multiple phases are alternately wound around a circumferential direction; a ring shaped yoke core inserted and arranged around the circumferential direction to connect a gear core between the upper gear core and the lower gear core. The upper gear core and the lower gear core are laminated cores where a steel plate is laminated around a circumferential direction and forms each gear, and the yoke core is a core formed with a ring shape. [Reference numerals] (110a) Upper gear; (110b) Lower gear; (110c) Yoke

Description

Stator of transverse flux electric machine having multi-Phase in circumferencial direction

The present invention relates to a stator of a transverse flux electric machine, and more particularly, in the transverse flux electric machine having a circumferential polyphase distribution, a conventional problem due to the use of an SMC core or a laminated core as a stator core. A stator capable of effectively eliminating the problem of degradation and the problem of deterioration of device performance and characteristics.

In general, electrical devices are devices that convert electrical energy into mechanical mechanical energy, and are being developed in various forms for high power and high efficiency.

The electric device may be classified into a seed flux electric device and a transverse flux electric device according to the flow direction of the magnetic flux.

Here, the case where the flow direction of the magnetic flux is the same as the movement direction (or rotation direction) of the electric machine mover (or rotor) is called a seed flux electric device, and when the flow direction of the magnetic flux is perpendicular to the moving direction of the electric machine mover It is called genus electric equipment.

In the case of the seed flux electric equipment, the magnetic path and the length of the coil end are long, so the loss caused by iron loss and copper loss is severe and the volume is relatively large. Therefore, the transverse flux having a ring coil is used to increase the efficiency and the power density. Electrical equipment can be used.

The stator of the transverse flux electric machine is composed of a stator core composed of a yoke and teeth and a coil of a ring shape, and a rotor (mover) is formed of a rotor core ( rotor core) and permanent magnets.

However, since this is an example of a basic structure, the coil may be located on the rotor instead of the stator, and the permanent magnet may also be located on the stator instead of the rotor.

However, in the transverse flux electric device having the ring coil, when the multiphase transverse flux electric device is to be implemented, the vibration of the electric device is increased due to the arrangement of the phase in the axial direction, and the axial length is long.

FIG. 1 shows an example of a three-phase transverse electric machine stator according to the prior art, and FIG. 2 shows a flux direction and a current direction in the three-phase transverse electric machine stator according to the prior art.

In FIG. 2, a black arrow indicates a magnetic flux direction, and a blue line and an arrow indicate an eddy current loop.

As shown in Fig. 1, the stator of a conventional three-phase transverse flux electric machine requires three stators 10a, 10b, and 10c arranged axially for three phases A, B, and C, respectively.

Each stator is wound with ring-shaped coils 14a, 14b, and 14c in the circumferential direction, and the first stator 10a and the second stator (A, B, and C phases are applied to the coils, respectively). 10b) and the third stator 10c are sequentially excited to generate rotational force.

However, when the stators for the plurality of phases are arranged in the axial direction as described above, since the place where the torque of the rotor 20 is generated is asymmetrical with respect to the axial direction, there is a problem of severe vibration.

That is, each of the first stator 10a, the second stator 10b, and the third stator 10c sequentially exerts the maximum torque on the rotor 20. The rotor 20 has an axial direction. The asymmetric phenomenon occurs with different torques, and vibrations are severe.

In addition, since the stators for the A, B, and C phases are disposed in the axial direction, the axial length of the transverse flux electric machine is increased, thereby limiting the applicable system.

In addition, the power factor is lowered due to an increase in leakage inductance, and the current capacity is increased, so that the output is increased, but the loss is also increased to generate a lot of heat.

In order to improve this problem, a transverse flux electric device having a multiphase distribution in the circumferential direction has been filed and registered by the present applicant (Patent No. 10-1117205).

Patent No. 10-1117205 discloses a rotor including an upper magnet having opposite magnetic poles alternately arranged along the circumferential direction and a lower magnet having a magnetic pole arrangement opposite to that of the upper magnets; A plurality of 'c' teeth comprising a pair of upper teeth and lower teeth respectively opposed to the magnetic poles of the vertically adjacent upper and lower magnets of the rotor are arranged along the circumferential direction, and the plurality of circumferentially arranged A transverse flux electric machine is shown having a circumferential polyphase distribution comprising a stator with windings of a plurality of phases each alternately wound on the tooth.

The transverse flux electric machine has a stator having a multi-phase distribution in the circumferential direction (three phases of A, B and C phases are arranged in the circumferential direction), thereby generating symmetrical torque for each rotor. This can significantly reduce the vibration of the electrical equipment.

In addition, since a plurality of phases are distributed around the same axis, it is possible to reduce the axial length of the transverse flux electric machine and to reduce the volume as compared with the structure in which three phases are arranged in the axial direction.

However, in the above-described transverse flux electric machine having a circumferential polyphase distribution, the stator core must have a portion forming a circumferential magnetic path, and in order to form such a magnetic path, all the stator cores including teeth are as in the seed flux electric machine. It should be made in one piece.

In order to fabricate all stator cores in this manner, the stator core must be configured using SMC cores, not laminated cores. In the case of laminated cores laminated in the axial direction, the shape of the steel sheet must vary according to the axial position. Fabrication and assembly are not easy

In addition, the steel sheet may be laminated in the circumferential direction, but in this case, much effort and expense are required, and due to the structure in which the steel sheets are laminated in the circumferential direction, magnetic flux cannot flow between the teeth and the teeth, thereby failing to properly implement performance.

However, since the SMC core is manufactured by powder molding, a large manufacturing tolerance occurs, and a large diameter exceeding a certain diameter (eg, 10 cm) is not only difficult to sinter itself, but also the density of the core is uneven, so that characteristics are not properly implemented.

In case of sintering by dividing teeth for uniform core density and forming, tolerances due to sintering accumulate and post-processing is required. As the iron loss increases, there is a problem that the performance is reduced.

To reduce iron loss, the powder is coated with SMC cores, which are halved by post-processing.

Accordingly, the present invention has been made to solve the above problems, the conventional problem by using the SMC core as a stator core or using a laminated core in a transverse flux electric machine having a circumferential polyphase distribution, that is, manufacturability It is an object of the present invention to provide a stator capable of effectively solving the problem of degradation and the problem of deterioration of device performance and characteristics.

In order to achieve the above object, the present invention provides an upper magnet arranged alternately along the circumferential direction, and a lower magnet arranged along the circumferential direction to have a magnetic pole arrangement opposite to that of the upper magnet. In a transverse flux electric machine comprising a rotating rotor, the upper and lower teeth having upper and lower teeth arranged circumferentially on the upper and lower sides so that the stator core faces the upper and lower magnets of the rotor. In a stator of a transverse flux electric machine having a circumferential polyphase distribution in which a plurality of coil windings are alternately wound along a circumferential direction,

The stator core has an upper tooth core forming an upper tooth which is arranged such that a plurality of coil windings are alternately wound along the circumferential direction, and a lower tooth core which forms a lower tooth which is arranged so that the plurality of coil windings are alternately wound along a circumferential direction. And a ring-shaped yoke core which is inserted and disposed in the circumferential direction so as to connect the tooth core between the upper tooth core and the lower tooth core.

The upper tooth core and the lower tooth core are laminated cores in which steel sheets are stacked along the circumferential direction to form respective teeth, and the yoke core is a shaped core formed in a ring shape. Provide the stator of the appliance.

Here, the yoke core may be an SMC core manufactured by powder molding.

Accordingly, according to the above-mentioned problem solving means, the tooth core forming the upper tooth and the tooth core forming the lower tooth are formed as a laminated core, and the ring-shaped SMC core is inserted along the circumferential direction so as to connect between these tooth cores. Thus, by constructing the stator core, it is possible to effectively solve the problems of the conventional transverse flux electric machine having a circumferential polyphase distribution, that is, a problem of deterioration in manufacturability and a problem of deterioration in device performance and characteristics.

1 is a perspective view schematically showing a three-phase transverse flux electric machine according to the prior art.
2 is a view showing a flux direction and a current direction in a stator for three-phase transverse flux electric machine according to the related art.
3 is a perspective view showing a stator structure according to an embodiment of the present invention.
Figure 4 is a perspective view showing the stacking direction and the ring-shaped SMC core assembly state of the steel sheets constituting the stator core in the stator according to the embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

Figure 3 is a perspective view showing a stator structure according to an embodiment of the present invention, Figure 4 is a perspective view showing the stacking direction and the ring-shaped SMC core assembly state of the steel plate constituting the stator core in the stator according to the embodiment of the present invention to be.

The present invention relates to a stator core which comprises a stator together with a coil in a transverse flux electric device, that is, a transverse flux electric device having a circumferential polyphase distribution, as described in Korean Patent No. 10-1117205, filed and registered by the present applicant. As an improved invention, FIG. 3 shows a part of a transverse flux electric machine having a rotor assembled together, including a stator structure.

Patent No. 10-1117205 shows an example of an abduction type rotary motor in which a rotor is rotated by being disposed outside the stator. However, the transverse flux electric machine shown in FIG. 3 has a rotating motor in which the rotor is disposed and rotated inside the stator. As an example, this is a difference between the internal and external types, compared to the rotary motor of Patent No. 10-1117205, but there is no difference in the basic configuration of the stator and the rotor, but the structure and configuration of the stator core itself will be described later. There is a difference.

In describing the stator according to the embodiment of the present invention, the embodiment of the pronation type illustrated in FIGS. 3 and 4 will be described as an example, but the stator of the present invention is an abduction type as described in Korean Patent No. 10-1117205. It can also be applied as a stator of the transverse flux electric device, it is also found that the modification to be used in the abduction type transverse flux electric device as described above using the basic concept of the present invention is also included in the scope of the present invention.

Referring to FIGS. 3 and 4, as illustrated, the rotor 200 includes a top magnet 220a positioned above and a bottom magnet 220b positioned below as a permanent magnet. 220a and the lower magnet 220b may be provided in a form attached to the surface of the rotor core 210.

The upper magnet 220a is installed such that the N pole and the S pole are alternately arranged along the circumferential direction, and the lower magnet 220b has the S pole and the N pole along the circumferential direction as opposed to the magnetic pole arrangement of the upper magnet 220a. It is installed to be arranged alternately.

Therefore, the magnets of the rotor 200, which are composed of the arrangement of the upper magnets 220a and the arrangement of the lower magnets 220b, have different magnetic poles between neighboring magnets in the circumferential direction, but are different from each other between the upper and lower neighboring magnets. I have a stimulus.

Meanwhile, the stator core 110 of the stator 100 according to the present invention includes a plurality of teeth arranged along the circumferential direction, and coil windings 120a, 120b and 120c are wound around each tooth.

The coil windings 120a, 120b, and 120c are wound around the upper teeth and the lower teeth of the 'c'-shaped stator core 110 according to an embodiment of the present invention. For electrical continuity, the electrical phase difference between the upper and lower tooth windings is 180 degrees.

In the stator 100 of the present invention, the stator core 110 has a cross-sectional shape perpendicular to the circumferential direction, that is, a cross-sectional shape taken along the longitudinal direction (axial direction) as a whole, having a 'c' shape. In view, the stator core 110 is positioned to connect the upper teeth corresponding to the upper magnets 220a, the lower teeth corresponding to the lower magnets 220b, and the upper teeth corresponding to the lower magnets 220b. It consists of a yoke part.

At this time, the coil winding is a winding 120a for phase A, a winding 120b for phase B and a winding 120c for phase C on a plurality of teeth arranged circumferentially with respect to the upper teeth of the stator core 110. It is wound up alternately.

The same applies to the lower teeth, in which windings for phase A, windings for phase B and windings for phase C are alternately wound around a plurality of teeth arranged circumferentially with respect to the lower teeth of the stator core.

If the winding wound on the upper tooth is clockwise, the winding wound on the lower tooth has a phase difference of 180 degrees electrically even when the same phase current is applied in the counterclockwise direction, so that the magnetic flux flows in one direction. .

Therefore, the number of teeth arranged in the circumferential direction in the stator according to the embodiment of the present invention is preferably a multiple of 3. In this case, the windings wound on the upper teeth and the lower teeth arranged up and down at the same position in the circumferential direction are the same phase. For winding.

As illustrated in FIG. 3, in the case of the pronation type in which the rotor 200 is disposed inside the stator 100, the upper teeth of the stator 100 are disposed at positions opposite to the outside of the rotor upper magnet 220a. The lower teeth of the stator 100 are disposed at positions opposite to the outer side of the rotor lower magnet 220b.

On the contrary, in the case of the abduction type in which the rotor is disposed outside the stator, although not illustrated in the drawings, those skilled in the art are positioned at the position where the upper teeth of the stator are opposed to the inside of the rotor upper magnet, and the lower teeth of the stator are inside the rotor lower magnet. It will be understood that the arrangement is located in the opposite position (see the abduction type structure described in Patent No. 10-1117205).

On the other hand, in the stator of the lateral flux electric machine having a circumferential polyphase distribution configured as described above, in the present invention, while utilizing the advantages of the circumferential polyphase distribution coil, the magnetic flux is well along the three-dimensional magnetic path that is characteristic of the transverse flux electric machine. We propose a stator configuration that combines a laminated core and an SMC core to flow.

3 and 4, the stator tooth portions (upper and lower tooth cores) on which the coil windings 120a, 120b, and 120c are wound in the stator core 110 are formed of a laminated core in which silicon steel sheets are laminated. The stator yoke portion arranged to connect between the upper tooth and the lower tooth is a portion forming a circumferential magnetic path and formed of a ring-shaped forming core capable of improving performance such as torque ripple.

That is, each tooth core (110a, 110b) forming the upper tooth and the lower tooth and the yoke core (110c) that is inserted to connect between the upper tooth and the lower tooth is separately manufactured, wherein each of the upper and lower teeth The tooth cores 110a and 110b are made of laminated cores, and the yoke core 110c is formed of molded ring shaped cores, and then the yoke core is formed between the upper tooth core 110a and the lower tooth core 110b, which are laminated cores. The stator core 110 is configured by inserting and connecting the 110c.

Here, the laminated core forming the tooth cores 110a and 110b may be manufactured by laminating silicon steel sheets in the circumferential direction, and the 'c' stator core 110 for implementing a transverse magnetic flux device having a circumferential polyphase distribution. The upper tooth core 110a and the lower tooth core 110b form an upper tooth and a lower tooth at which windings of each phase are alternately wound along the circumferential direction.

In addition, the ring-shaped core 110c as the magnetic forming member may be a core manufactured by powder molding, preferably an SMC core molded using soft magnetic composite powder having a constant density.

Accordingly, the stator core 110 according to the present invention has a ring-shaped yoke connecting them between the upper teeth and the lower teeth, on which coil windings of each phase are wound, to form a circumferential multiphase distribution by the core combination as described above. It has a structure arranged long along the circumferential direction.

In a conventional transverse flux electric machine in which a multi-phase distribution coil is disposed in the axial direction, a ring-shaped coil is used for each phase (see FIG. 1). As the vortex rotates in the circumferential direction, the iron loss is greatly increased, so in practice, the core must be separated.

However, in the case of having a multiphase distribution in the circumferential direction, unlike in the case of using a ring-shaped coil, since the vortex forms a small loop for each phase rather than one loop that rotates in the circumferential direction, the iron loss is not large accordingly. It is necessary to insert a ring-shaped core to form a ruler for improving the characteristics of the electric machine.

In this way, in the present invention, the tooth core 110a forming the upper tooth and the tooth core 110b forming the lower tooth are formed as laminated cores, and the ring is circumferentially connected to connect the tooth cores 110a and 110b. The stator core 110 is formed by inserting and arranging the SMC core, that is, the yoke core 110c, to effectively solve the problem of the transverse flux electric machine having the conventional circumferential polyphase distribution, that is, the problem of deterioration in performance and characteristics. It becomes possible.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And are included in the scope of the present invention.

100: stator 110: stator core
110a: upper tooth core 110b: lower tooth core
110c: yoke core 200: rotor
210: rotor core 220a: upper magnet
220b: bottom magnet

Claims (2)

In a transverse flux electric machine comprising a rotor including an upper magnet arranged alternately along the circumferential direction to have opposite magnetic poles, and a lower magnet arranged along the circumferential direction to have a magnetic pole arrangement opposite to that of the upper magnet. A plurality of coil windings alternately along the circumferential direction of the upper and lower teeth, with the upper and lower teeth arranged circumferentially on the upper and lower sides such that the stator core faces the upper and lower magnets of the rotor. In the stator of a transverse flux electric machine having a wound circumferential polyphase distribution,
The stator core has an upper tooth core forming an upper tooth which is arranged such that a plurality of coil windings are alternately wound along the circumferential direction, and a lower tooth core which forms a lower tooth which is arranged so that the plurality of coil windings are alternately wound along a circumferential direction. And a ring-shaped yoke core which is inserted and disposed in the circumferential direction so as to connect the tooth core between the upper tooth core and the lower tooth core.
The upper tooth core and the lower tooth core are laminated cores in which steel sheets are stacked along the circumferential direction to form respective teeth, and the yoke core is a shaped core formed in a ring shape. Stator of the device.
The method according to claim 1,
The yoke core is a stator of a transverse flux electric machine having a circumferential polyphase distribution, characterized in that the SMC core is manufactured by powder molding.

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