AU2015100505A4 - Asymmetric two slot transformer magnetic core assembly - Google Patents

Abstract

An asymmetric two slot transformer magnetic core assembly comprises a first core formed by a plurality of sub-cores which are tightly enclosed one by one; each sub-core formed by a plurality of two slot silicon steel 5 sheet and each two slot silicon steel sheet having two slots and having an approximately rectangular shape which is formed by two longitudinal sides and two transversal sides; the two slots are located at the two longitudinal sides; each two slot silicon steel sheet having two slots which are at the opposite side of the sub-core so that the sub-core are divided into two 0 approximate U shape units; by this structure, the coils can be assembled with an cores easily. The plurality of two slot silicon steel sheets are overlapped one by one so that the outside two slot silicon steel sheet has is larger than the inside two slot silicon steel sheet. Figure 16

Description

EDITORIAL NOTE 2015100505 There are eight pages of description only.

ASYMMETRIC TWO SLOT TRANSFORMER MAGNETIC CORE ASSEMBLY FIELD OF THE INVENTION 5 The present invention relates to transformers, and in particular to an asymmetric two slot transformer magnetic core assembly. BACKGROUND OF THE INVENTION As illustrated in Figs. 1 to 4, a prior art multiple silicon steel sheet core 0 for a transformer of the present invention is illustrated. The structure includes a first core 20' formed by a plurality of sub-cores 10' which are tightly enclosed one by one. Each sub-core 10 has only one slot. Each silicon steel sheet 10' has an approximately rectangular shape which is formed by two longitudinal sides and two transversal sides. Furthermore 5 corners of the steel sheet 10' are cambered, as illustrated in Fig. 1. In the prior art, a single slot silicon steel sheet 10'includes only one slot 11'. The silicon steel sheets are adjacent one by one and the silicon steel sheet at an outer side has a large size than that at inner side and tightly clamps the inner side one. 20 In assembly, an outer side silicon steel sheet is expanded along the slot to expand the size of the slot for enclosing another silicon steel sheet to be arranged at an inner side. The process is repeated continuously. Finally, a plurality of single slot silicon steel sheets are grouped together by one enclosing another adjacent one so as to form as a core 20', as illustrated in 25 Fig. 2. With reference to Fig. 3, the above mentioned process is time consumed and tedious so that the cost is high. Furthermore, to expand the silicon steel sheet will deform itself to increase magnetic lose of the core. Furthermore, corners of prior art silicon steel sheets are cambered. It is formed by using a mold to fix the sheet for a long time and then the sheet is 30 sintered further so as to form the shape permanently. It is time consumed and complicated in process. Therefore, the object of the present invention is to provide a novelty asymmetric double slot transformer core structure which can resolve the problems in the prior art. 5 SUMMARY OF INVENTION Accordingly, the object of the present invention is to provide an asymmetric two slot transformer magnetic core assembly, which can improve above mentioned prior art defects. In the present invention, each of 0 the silicon steel sheet has two slots and can be divided into a long unit and a short unit so that the assembly work is easy, while in the prior art, the core with only one slot so that in assembly, each core is expanded by force. This is inconvenient and tedious for the workers. Furthermore, in the present invention, the cores can be transferred by dividing them into long 5 units and short units. Finally, in assembly they are assembly by inserting the coils into the long units and then assembling the short units to the respective long units. However, for the conventional single slot core, the cores are expanded from the slots for engaging to the coil one by one. Each time only several cores are assembly and a very long time is needed 20 for assembling all the cores to the coils. Working time is long and cost is high. To achieve above mentioned defects, the present invention provides an asymmetric two slot transformer magnetic core assembly, comprising: a first core formed by a plurality of sub-cores which are tightly enclosed one 25 by one; each sub-core formed by a plurality of two slot silicon steel sheet and each two slot silicon steel sheet having two slots and having an approximately rectangular shape which is formed by two longitudinal sides and two transversal sides; the two slots are located at the two longitudinal sides; each two slot silicon steel sheet having two slots which are at the 30 opposite side of the sub-core so that the sub-core are divided into two approximate U shape units; by this structure, the coils can be assembled with an cores easily; and wherein the plurality of two slot silicon steel sheets are overlapped one by one so that the outside two slot silicon steel sheet has is larger than the inside two slot silicon steel sheet, as well as the 5 outside one enclosed tightly the inner one. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a prior art single slot core. Fig. 2 shows a first core in the prior art. 0 Fig. 3 is an assembly schematic view about a prior art single slot silicon steel sheet. Fig. 4 is a schematic view about the assembly of the first core. Fig. 5 is a schematic view showing that a two slot silicon steel sheet with a straight corner side. 5 Fig. 6 shows a two slot silicon steel sheet according to the present invention with a cambered corner. Fig. 7 shows the arrangement of the sub core structure of the present invention. Fig. 8 is a perspective view of the first core of the present invention. 20 Fig. 9 shows a long unit of a core of the present invention. Fig. 10 shows a short unit of the core of the present invention. Fig. 11 is an assembled schematic view of the first core with a coil (windings). Fig. 12 is an assembled schematic view about a shell type core set of 25 the present invention. Fig. 13 is an assembled schematic view of a three phase asymmetric core set with coils according to the present invention. Fig. 14 is a schematic view about the assembly of a core type core set. Fig. 15 is a schematic view showing the assembly of shell type core set. 30 Fig. 16 is a schematic view about the three phase asymmetric core set description of the invention DETAILED DESCRIPTION OF THE INVENTION In order that those skilled in the art can further understand the present 5 invention, a description will be provided in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims. 0 With reference to Figs. 5 and 16, the structure of the present invention is illustrated. A first core 20 is formed by a plurality of sub-cores 21 which are tightly enclosed one by one. Each sub-core 21 is formed by a plurality of two slot silicon steel sheet 10 and each two slot silicon steel sheet 10 has 5 two slots 11 and has an approximately rectangular shape which is formed by two longitudinal sides and two transversal sides. The two slots are located at the two longitudinal sides. Furthermore corners of the steel sheet 10 are cambered or are folded to have a bending section, as illustrated in Fig. 5. In this embodiment, the corners are chamfered to make the whole structure 20 of the sub-core 21 has an octagonal shape, However, this structure is not used to confine the scope of the present invention. Each two slot silicon steel sheet 10 has two slots 11 which are at the opposite side of the sub-core 21 so that the sub-core 21 can be divided into two approximate U shape units. By this structure, the coils (windings) can 25 be assembled with the cores easily. The plurality of two slot silicon steel sheets 10 are overlapped one by one so that the outside two slot silicon steel sheet 10 has is larger than the inside two slot silicon steel sheet 10, as well as the outside one enclosed tightly the inner one. 30 Furthermore, each two slot silicon steel sheet 10 is formed by directional silicon steel sheet. Preferably, slots of the plurality of two slot silicon steel sheets 10 at the same side are arranged at different positions and are deviated so that one is slightly distant from an adjacent one for reducing the magnetic lose 5 of the first core 20. Preferably, each corner of the two slot silicon steel sheet 10 has an angle of 135 degrees. Each of the two slots 11 located at two longitudinal sides of each two slot silicon steel sheet 10 and are near the same bottom sides so that one U shape unit of the two slot silicon steel sheet 10 is longer 0 than another U shape unit of same two slot silicon steel sheet 10. Furthermore a plurality of sub-cores 21 are grouped together and positions of the slots of the same sides of the plurality of sub-cores 21 are varied based on the same trend of variations, for example, the outer one is distant farther than the inner one or vice versa. 5 Preferably, two slots of a two slot silicon steel sheet 10 are at the same position with respect to the sides thereof, for example the two slots are all at middles of the sides thereof. In assembly, two sides of the first core 20 are inserted into the hollow space of a coil 100 (winding set), in that the first core 20 may be lain or 20 stand as desired. In assembling with coils, as illustrated in Figs. 9, 10 and 14, firstly, the first core 20 including a plurality of sub-cores 21 is divided into two units, one long unit has longer longitudinal sides and another short unit has short longitudinal sides as illustrated in the drawings. The longer unit is 25 inserted into hollow spaces of a first coil 100 and a second coil 101. Then the short unit is inserted into the hollow spaces of the first coil 100 and the second coil 101 and is also engaged to the long unit so as to complete the assembly of the first transformer core 20 to the coils (windings), as illustrated in Fig. 11. 30 However, as said above, in assembling of the present invention, it is unnecessary to expand the single slot silicon steel sheet from the slot and then inserted the silicon steel sheet into the two coils one by one. In the present invention, the first core 20 is divided into a longer unit and a shorter unit. It only needs to insert the two units into coils and engage 5 them together. The assembly work is easy and quick. With reference to Fig. 12, the present invention is also suitable to a shell type core 200. In this structure, other than above mentioned first core 20, the present invention further includes: A second core 30 is arranged in parallel with the first core 20. The 0 structure of the second core 30 is identical to the first core 20, but the size thereof may be not identical. In assembly, an inner side of the first core 20 and an inner side of the second core 30 adjacent to the inner side of the first core 20 are inserted into a hollow space of a coil 102 so as to form as a shell type transformer 5 200. The assembly work can be done in a lying form or a stand form. In assembly, as illustrated in Fig. 15, in assembly of the transformer, each of the first core 20 and second core 30 is divided into a longer unit and a shorter unit. It only needs to insert the two long units into coils, then inserted the two short units into the coil and finally engage the long and 20 short units of each core together. The assembly work is easy and quick. As illustrated in Fig. 13, a three phase asymmetric core 300 is illustrated. The set 300 includes a first core 20 and a second core 30 as above said. Furthermore the core 300 further includes the following elements. 25 An outer core 40 encloses the first core 20 and the second core 30. The structure of the outer core 40 is identical to the first core 20 and the second core 30, while the size of the outer core 40 is not identical thereto. In assembly, a side of the first core 20 far away from the second core 30 and a side of the outer core 40 are inserted into a hollow space of a first 30 coil 103. Another side of the first core 20 and a side of the second core 30 adjacent to the first core 20 are inserted into a hollow space of a second coil 104. Another side of the second core 30 far away from the first core 20 and another side of the outer core 40 are inserted into a hollow space of a second coil 105. Thus a three phase and three coil transformer is formed. 5 In assembly, the three phase asymmetric core 300 can be lain or stand as desired. In assembly, as illustrated in Fig. 16, each of the first core 20, second core 30 and outer core 40 is divided into a long unit and a short unit as above mentioned. The long units of the first core 20 and second core 30 are 0 placed within the long unit of the outer core 40. Then the first, second and third coils 103, 104 and 105 are engaged to the long units so that the long units are inserted into the hollow spaces of the coils. Finally, the short units of the first, second and third cores are inserted into the hollow spaces of the coils and are engaged with the respective long units. 5 Advantages of the present invention are that each of the silicon steel sheet has two slots and can be divided into a long unit and a short unit so that the assembly work is easy, while in the prior art, the core with only one slot so that in assembly, each core is expanded by force. This is inconvenient and tedious for the workers. Furthermore, in the present 20 invention, the cores can be transferred by dividing them into long units and short units. Finally, in assembly they are assembly by inserting the coils into the long units and then assembling the short units to the respective long units. However, for the conventional single slot core, the cores are expanded from the slots for engaging to the coil one by one. Each time 25 only several cores are assembly and a very long time is needed for assembling all the cores to the coils. Working time is long and cost is high. Moreover, in the present invention, each corner of the core is formed with a bending side so that as a whole, the core has an octagonal shape. 30 The work is easy for forming the bending side only by clamping the side of the corner by a camper, while in the prior art, the corner has a cambered are shape (an R corner). It is very difficult to form it. At first, the arc is formed by an inner cambered mold to mold the corner for a very long time. Then, the corner is sintered to fix the shape. The work is tedious and long 5 time is required so that as a whole, the cost is high. The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to 0 be included within the scope of the following claims according to the present invention.

Claims (8)

1. An asymmetric two slot transformer magnetic core assembly, comprising: a first core formed by a plurality of sub-cores which are tightly 5 enclosed one by one; each sub-core formed by a plurality of two slot silicon steel sheet and each two slot silicon steel sheet having two slots and having an approximately rectangular shape which is formed by two longitudinal sides and two transversal sides; the two slots are located at the two longitudinal sides; 0 each two slot silicon steel sheet having two slots which are at the opposite side of the sub-core so that the sub-core are divided into two approximate U shape units; by this structure, the coils can be assembled with an cores easily; and wherein the plurality of two slot silicon steel sheets are overlapped one 5 by one so that the outside two slot silicon steel sheet has is larger than the inside two slot silicon steel sheet, as well as the outside one enclosed tightly the inner one.

2. The asymmetric two slot transformer magnetic core assembly as claimed in claim 1, wherein in assembly, the two lateral sides of the first 20 core are inserted into a hollow space of a coil (windings) by lying state or standing state so as to form as a core type transformer core.

3. The asymmetric two slot transformer magnetic core assembly, further comprising a second core arranged in parallel with the first core; a structure of the second core being identical to the first core; 25 wherein in assembly, an inner side of the first core and an inner side of the second core adjacent to the inner side of the first core are inserted into a hollow space of a coil so as to form as a shell type transformer; and in assembly of the transformer, each of the first core and second core is divided into a longer unit and a shorter unit; it only needs to insert 30 the two long units into coils, then inserted the two short units into the coil and finally engage the long and short units of each core together.

4. The asymmetric two slot transformer magnetic core assembly as claimed in claim 1, wherein further comprising: a second core arranged in parallel with the first core; a structure of the 5 second core being identical to the first core; an outer core enclosing the first core and the second core; a structure of the outer core being identical to the first core and the second core; wherein in assembly, a side of the first core far away from the second core and a side of the outer core are inserted into a hollow space of a first 0 coil; another side of the first core and a side of the second core adjacent to the first core are inserted into a hollow space of a second coil; as well as another side of the second core away from the first core and another side of the outer core are inserted into a hollow space of a second coil; thus a three phase and three coil transformer is formed; in assembly, the three phase 5 asymmetric core can be lain or stand and wherein in assembly, each of the first core, second core and outer core is divided into a long unit and a short unit; the long units of the first core and second core are placed within the long unit of the outer core; then the first, second and third coils are engaged to the long units that the long units 20 are inserted into the hollow spaces of the coils; finally, the short units of the first, second and third cores are inserted into the hollow spaces of the coils and are engaged with the respective long units.

5. The asymmetric two slot transformer magnetic core assembly as claimed in claim 1, wherein corners of the steel sheet are folded to have a 25 bending section to make a whole structure of the sub-core has an octagonal shape.

6. The asymmetric two slot transformer magnetic core assembly as claimed in claim 5, wherein a bending angle of the octagonal shape is about 135 degrees. 30

7. The asymmetric two slot transformer magnetic core assembly as claimed in claim 1, wherein slots of the plurality of two slot silicon steel sheets at the same side are arranged at different positions and are deviated so that one is slightly distant from an adjacent one for reducing the magnetic loss of the first core. 5

8. The asymmetric two slot transformer magnetic core assembly as claimed in claim 1, wherein each of the two slots located at two longitudinal sides of each two slot silicon steel sheet and are near the same bottom sides so that one U shape unit of the two slot silicon steel sheet is longer than another U shape unit of same two slot silicon steel sheet; and 0 furthermore a plurality of sub-cores are grouped together and positions of the slots of the same sides of the plurality of sub-cores are varied based on the same trend of variations.