Stator for electric motor and electric motor comprising same

Abstract

A stator for an electric motor is provided. An exemplary embodiment of the stator for an electric motor according to the present invention includes: at least one coil; and a stator core including a yoke in a closed-loop shape and a slot extending a predetermined length from the yoke, the slot including a plurality of slots forming a multiphase, the multiphase including a first phase and a second phase different from the first phase, wherein the total number of turns obtained by adding the number of turns of the coils respectively wound in the plurality of slots forming the first phase can be the same as the total number of turns obtained by adding the number of turns of the coils respectively wound in the plurality of slots forming the second phase.

Description

Technical Field

[0001] This invention relates to a stator for an electric motor and an electric motor including the stator. Background Technology

[0002] An electric motor is a device that uses electrical energy to generate driving force. These electric motors are widely used in various electronic devices, household appliances, automobiles, and more.

[0003] As an example, electric motors are used in automobile engines to provide the driving force for actuating the intake valves.

[0004] On the other hand, in recent years, people have made various efforts to improve the power and efficiency of automobile engines, and improving intake efficiency by adjusting the intake valve timing is also part of this effort.

[0005] The intake valve is opened / closed by reciprocating motion of a drive rod connected to it, driven by a motor. Therefore, the electric motor for operating the drive rod of the intake valve is located in the engine compartment.

[0006] However, the space available for installation is limited because various components are located in the engine compartment of a vehicle.

[0007] Therefore, as Figure 14 As shown, in the existing electric motor 1 for driving vehicle valves, which includes rotor 20 and stator 30, there is a limitation that the rotor shaft 22 of rotor 20 can only be eccentrically connected to drive rod 2 by means of worm gear 3 and worm 4.

[0008] That is, due to the space constraints in the engine compartment, and considering the connection between the rotor shaft 22 and the drive rod 2, there is a limitation that the slot 32 of the winding coil 40 in the stator 30 can only face one side of the housing 10.

[0009] However, when the slot 32 in the stator 30 where the coil 40 is wound is asymmetrical, the overall size of the stator 30 inevitably decreases, resulting in a reduction in the driving force or power of the motor. Summary of the Invention

[0010] Technical issues

[0011] The present invention addresses the problems described above, and aims to provide a stator for an electric motor and an electric motor including the stator therein, which can improve motor efficiency and ensure design freedom even when installed in a limited space such as an engine room, without changing the previous installation position.

[0012] Problem-solving methods

[0013] To address the aforementioned problems, the present invention provides a stator for an electric motor, comprising: at least one coil; and a stator core including a yoke in a closed-loop shape and a slot extending a predetermined length from the yoke, the slot including a plurality of slots forming a multiphase, the multiphase including a first phase and a second phase different from the first phase, wherein the total number of turns obtained by adding the number of turns of the coils wound respectively in the plurality of slots forming the first phase is the same as the total number of turns obtained by adding the number of turns of the coils wound respectively in the plurality of slots forming the second phase.

[0014] Furthermore, at least some of the aforementioned slots can be configured such that the lengths of the teeth wound around the coil are different.

[0015] Furthermore, the aforementioned slots can extend inwards by a predetermined length from the aforementioned yoke. In this case, the aforementioned stator for an electric motor can be applied to an internal rotor type electric motor.

[0016] Alternatively, the aforementioned slots can extend outward by a predetermined length from the aforementioned yoke. In this case, the aforementioned stator for an electric motor can be applied to an external rotor type electric motor.

[0017] Furthermore, the aforementioned yoke may be non-circular, including at least one straight portion.

[0018] At this time, the yoke may include: a first arc portion having a predetermined curvature; a second arc portion having a predetermined curvature and configured not to be connected to the first arc portion; a first straight portion for connecting one end of the first arc portion and the second arc portion; and a second straight portion for connecting the other end of the first arc portion and the second arc portion.

[0019] Furthermore, the second straight section may include a first portion connected to the end of the first arc portion and a second portion connected to the end of the first portion and connected to the end of the second arc portion. The second portion may be connected to one end of the first portion at a predetermined angle other than 0 degrees.

[0020] Furthermore, the first and second arc portions mentioned above can have the same length, or they can have different lengths.

[0021] Furthermore, the aforementioned groove can be formed as a three-phase system including U phase, V phase, and W phase.

[0022] On the other hand, the present invention provides an electric motor comprising: a housing; a rotor including a rotor shaft rotatably mounted on the housing and a plurality of magnets arranged along the circumferential direction of the rotor shaft; and a stator fixed to the housing, having a coil wound in at least one slot.

[0023] Furthermore, the rotor shaft can be coupled to a drive rod gear that enters the interior of the housing via a gear section, and the drive rod can be eccentrically connected to the rotor shaft via the gear section.

[0024] The effects of the invention

[0025] According to the present invention, even when installed in the same location as before within a limited installation space such as an engine compartment, high power and efficiency can be achieved without redesigning the surrounding components.

[0026] Furthermore, according to the present invention, the tooth length of the slot of the winding coil can be freely changed, thereby increasing the degree of design freedom. Attached Figure Description

[0027] Figure 1 A diagram illustrating a stator for an electric motor according to an embodiment of the present invention.

[0028] Figure 2 To show Figure 1 The diagram shows the state of the coil removed.

[0029] Figure 3 for Figure 2 Top view.

[0030] Figure 4 This diagram illustrates the configuration relationship between the slots of the stator core and the magnets of the rotor in an electric motor stator according to an embodiment of the present invention.

[0031] Figure 5 To demonstrate what can be applied Figure 4 Another form of stator core is shown in the diagram.

[0032] Figure 6 To demonstrate what can be applied Figure 4 Another form of stator core is shown in the diagram.

[0033] Figure 7 A diagram illustrating the stator for an electric motor according to another embodiment of the present invention.

[0034] Figure 8 To show Figure 7 The diagram shows the state of the coil removed.

[0035] Figure 9 This diagram illustrates the configuration relationship between the slots of the stator core and the magnets of the rotor in an electric motor stator according to another embodiment of the present invention.

[0036] Figure 10 A diagram illustrating an electric motor using an electric motor stator according to an embodiment of the present invention.

[0037] Figure 11 for Figure 10The image shows a section of the rotor and stator.

[0038] Figure 12 For brevity Figure 10 A diagram showing the connection between the electric motor and the drive rod.

[0039] Figure 13 for Figure 12 The image shows a section of the rotor, stator, and drive rod.

[0040] Figure 14 A simplified diagram illustrating the connection between the drive rod and the rotor shaft in a conventional electric motor. Detailed Implementation

[0041] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement the invention. However, the present invention can be implemented in many different ways, and therefore is not limited to the embodiments described herein. In the drawings, parts unrelated to the description are omitted to clearly illustrate the invention, and throughout the specification, the same reference numerals are used to assign the same or similar structural elements.

[0042] like Figure 1 and Figure 7 As shown, the stator 100, 200 for an electric motor according to an embodiment of the present invention may include at least one coil 110 and stator core 120, 220, wherein the at least one coil 110 may be wound around the stator core 120, 220.

[0043] That is, the stator cores 120 and 220 may include yokes 121 and 221 and slots 122, and the coils 110 may be wound around the slots 122.

[0044] like Figure 2 and Figure 8 As shown, the stator cores 120 and 220 described above can be formed by multiple layers of metal sheets, including the yokes 121 and 221 and the slot 122, but are not limited to this and can also be formed by a single component.

[0045] At this point, the aforementioned yokes 121 and 221 can form a closed loop shape.

[0046] As an example, the aforementioned yokes 121 and 221 may be non-circular, including at least one straight portion 121a, 121b, 221a, 221b.

[0047] That is, such as Figures 1 to 9As shown, the aforementioned yokes 121 and 221 may include at least one straight portion 121a, 121b, 221a, 221b and at least one arc portion 121c, 121d, 221c formed in a manner having a predetermined curvature, wherein the straight portions 121a, 121b, 221a, 221b and the arc portions 121c, 121d, 221c may be connected.

[0048] Therefore, in the yoke 121 described above, the straight sections 121a, 121b, 221a, and 221b are connected to the arc sections 121c, 121d, and 221c, thus allowing it to have a non-circular closed-loop shape.

[0049] As a non-restrictive example, such as Figures 4 to 6 As shown, in the stator cores 120, 120', 120" the yoke 121 can be in a non-circular closed loop shape through the arc portions 121c and 121d including the first arc portion 121c and the second arc portion 121d, and the straight portions 121a and 121b including the first straight portion 121a and the second straight portion 121b.

[0050] In this case, the first arc portion 121c and the second arc portion 121d may not be connected, and the first straight portion 121a and the second straight portion 121b may be connected to the ends of the first arc portion 121c and the second arc portion 121d, respectively.

[0051] At this time, as Figures 1 to 4 As shown, in the stator core 120 described above, the first arc portion 121c and the second arc portion 121d can have the same length, but as Figure 5 and Figure 6 As shown, in the stator cores 120' and 120" mentioned above, the first arc portion 121c and the second arc portion 121d may have different lengths.

[0052] In addition, if Figures 1 to 6 As shown, in the stator cores 120, 120', and 120" mentioned above, at least one of the first straight portion 121a and the second straight portion 121b can be formed such that a portion of the length 121b' that is not a straight line has a predetermined length relative to the remaining length 121b".

[0053] Therefore, the yoke 121 can be changed into various shapes depending on the configuration position, length, and shape of the first straight section 121a and / or the second straight section 121b connecting the first arc section 121c and the second arc section 121d.

[0054] As a specific example, such as Figure 4As shown, in the stator core 120, the first arc portion 121c and the second arc portion 121d may have the same length. The first straight portion 121a connecting one end of the first arc portion 121c and the second arc portion 121d may be straight. The second straight portion 121b connecting the other end of the first arc portion 121c and the second arc portion 121d may include a first portion 121b' and a second portion 121b connected in a manner that forms a predetermined angle.

[0055] In this case, one end of the first part 121b' can be connected to the end of the first arc portion 121c, and the other end can be connected to the second part 121b”. One end of the second part 121b” can be connected to the end of the second arc portion 121d, and the other end can be connected to the first part 121b'.

[0056] At this time, the second part 121b” can be connected to one end of the first part 121b’ at a predetermined angle other than 0 degrees, and the part of the first part 121b’ connected to the second part 121b” can be connected in a way that protrudes toward the inside of the yoke 121.

[0057] As another example, such as Figure 5 As shown, in the stator core 120', the first arc portion 121c and the second arc portion 121d may have different lengths. The first straight portion 121a connecting one end of the first arc portion 121c and the second arc portion 121d may be straight. The second straight portion 121b connecting the other end of the first arc portion 121c and the second arc portion 121d may include a first portion 121b' and a second portion 121b connected in a manner that forms a predetermined angle.

[0058] In this case, one end of the first part 121b' can be connected to the end of the first arc portion 121c, and the other end can be connected to the second part 121b”. One end of the second part 121b” can be connected to the end of the second arc portion 121d, and the other end can be connected to the first part 121b'.

[0059] At this time, the second part 121b” can be connected to one end of the first part 121b’ at a predetermined angle other than 0 degrees, and the part of the first part 121b’ connected to the second part 121b” can be connected in a way that protrudes toward the inside of the yoke 121.

[0060] As another example, such as Figure 6As shown, in the stator core 120, the first arc portion 121c and the second arc portion 121d may have different lengths. The first straight portion 121a connecting one end of the first arc portion 121c and the second arc portion 121d may be straight. The second straight portion 121b connecting the other end of the first arc portion 121c and the second arc portion 121d may include a first portion 121b' and a second portion 121b connected in a manner that forms a predetermined angle.

[0061] In this case, one end of the first part 121b' can be connected to the end of the first arc portion 121c, and the other end can be connected to the second part 121b”. One end of the second part 121b” can be connected to the end of the second arc portion 121d, and the other end can be connected to the first part 121b'.

[0062] At this time, the second part 121b” can be connected to one end of the first part 121b’ at a predetermined angle other than 0 degrees, and the part of the first part 121b’ connected to the second part 121b” can be connected in a way that protrudes outward toward the yoke 121.

[0063] Therefore, the yoke 121 described above can have a closed-loop shape including various shapes of non-circular straight sections.

[0064] As yet another example, such as Figures 7 to 9 As shown, in the stator core 220, the yoke 221 can be in a non-circular closed loop shape through two straight sections 221a and 221b connected at one end and an arc section 221c connected at both ends to the straight sections 221a and 221b respectively.

[0065] As described above, in the stator cores 120 and 220 of an embodiment of the present invention, the yokes 121 and 221 can be arranged into closed loop shapes of various shapes by interconnecting at least one straight portion 121a, 121b, 221a, 221b with at least one arc portion 121c, 121d, 221c.

[0066] However, the shapes of the yokes 121 and 221 are not limited to these. The yokes 121 and 221 may be formed only by the straight portions 121a, 122b, 221a, and 221b, or only by the arc portions 122c, 122d, and 221c, or they may be circular. Furthermore, the yokes 121 and 221 may also be in the form of at least two connected parts with different curvatures.

[0067] The aforementioned groove 122 may be wound with a coil 110, which generates a magnetic field when a power source is applied. For this purpose, the aforementioned groove 122 may extend a predetermined length from the aforementioned yokes 121, 221 inward or outward, so that the aforementioned coil 110 can be wound with a predetermined number of turns.

[0068] As an example, such as Figures 1 to 6 As shown, the groove 122 can extend inward from the yoke 121 by a predetermined length.

[0069] The groove 122 described above may include a plurality of grooves 122a, 122b, and 122c, which are spaced apart along the edge of the yoke 121 and protrude inward from the edge of the yoke 121 by a predetermined length, such as... Figure 3 As shown, the aforementioned slots 122a, 122b, and 122c can be configured to form equal angles with each other based on the virtual center point.

[0070] Therefore, as Figures 4 to 6 As shown, when the rotor 1200 constituting the electric motor 1000 is positioned at the center of the yoke 121 along with the magnet 1220, the plurality of slots 122a, 122b, and 122c can be configured to surround the rotor 1200, and the plurality of slots 122a, 122b, and 122c can be arranged at equal angles around the rotor 1200. Therefore, the electric motor 1000 can be implemented as an internal rotor type motor.

[0071] As yet another example, such as Figures 7 to 9 As shown, the groove 122 can extend outward from the yoke 221 by a predetermined length.

[0072] The groove 122 described above may include a plurality of grooves 122a, 122b, and 122c. The plurality of grooves 122a, 122b, and 122c are arranged spaced apart along the edge of the yoke 221 and protrude outward from the edge of the yoke 221 by a predetermined length. The plurality of grooves 122a, 122b, and 122c may be arranged to form equal angles with each other with reference to the center point of the yoke 221.

[0073] Therefore, as Figure 9 As shown, when the magnet 1220 constituting the rotor of the electric motor is positioned outside the yoke 221, the plurality of slots 122a, 122b, and 122c can be surrounded by the magnet 1220. Therefore, the electric motor can be implemented as an external rotor type motor.

[0074] At this time, the groove portion 122 may have multiple phases, including a first phase and a second phase different from the first phase. At least some of the grooves 122a, 122b, and 122c constituting the groove portion 122 may be formed such that the length of the tooth T wound around the coil 110 is different.

[0075] In this case, the first total number of turns obtained by adding the number of turns of the coils 110 wound on the plurality of slots 122a forming the first phase can be the same as the second total number of turns obtained by adding the number of turns of the coils 110 wound on the plurality of slots 122b forming the second phase.

[0076] That is, the plurality of grooves 122a, 122b, and 122c constituting the groove portion 122 can each form a phase, some of the plurality of grooves 122a, 122b, and 122c can form the same phase, and other of the plurality of grooves 122a, 122b, and 122c can form different phases.

[0077] Furthermore, the first total number of turns obtained by adding the number of turns of the coil 110 wound in multiple slots forming the same phase can be the same as the second total number of turns obtained by adding the number of turns of the coil 110 wound in multiple slots forming different phases.

[0078] In this case, some of the slots 122a among the plurality of slots 122a, 122b, and 122c may have the first phase, and some of the slots 122b among the plurality of slots 122a, 122b, and 122c may have the second phase. The number of slots 122a forming the first phase and the number of slots 122b forming the second phase may be the same.

[0079] The aforementioned grooves 122a, 122b, and 122c may each include a tooth T extending a predetermined length from the aforementioned yokes 121 and 221 toward the inner or outer side, and a shoe-shaped object S formed at the end of the aforementioned tooth T. The aforementioned coil 110 may be wound around the aforementioned tooth T.

[0080] Therefore, even if the yokes 121 and 221 are non-circular closed-loop shapes as described above, and at least some of the grooves 122a, 122b, and 122c have teeth T of different lengths, the shoe-shaped part S formed at the ends of the grooves 122a, 122b, and 122c can be located on a virtual circumference.

[0081] That is, such as Figures 4 to 6 As shown, when the rotor 1200 is disposed inside the yoke 121, the plurality of grooves 122a, 122b, and 122c constituting the groove portion 122 can be configured to surround the peripheral surface of the rotor 1200.

[0082] And, as Figure 9 As shown, when the magnet 1220 is disposed on the outside of the yoke 221, each shoe-shaped object S in the plurality of grooves 122a, 122b, 122c constituting the groove portion 122 can be configured to be spaced apart from the magnet 1220 by a predetermined distance and facing the magnet 1220.

[0083] Therefore, even if the yokes 121 and 221 are non-circular closed-loop shapes as described above, and the multiple slots 122a, 122b, and 122c have teeth T of different lengths, the coil 110 can be wound around each slot 122a, 122b, and 122c regardless of the length of the teeth T by setting the total number of turns of the coil 110 wound around the multiple slots forming the same phase.

[0084] Therefore, even if the yokes 121 and 221 are non-circular closed-loop shapes, and the slots 122a, 122b, and 122c have teeth T of different lengths, the coil 110 can be wound around the slots 122a, 122b, and 122c respectively. This maximizes the space utilization of the wound coil 110 while ensuring that the coil 110 has the same total number of turns in each phase. This allows for high power and efficiency of the motor. Furthermore, since the tooth T length of the slots of the wound coil 110 can be freely changed, the design freedom can be increased.

[0085] As a non-limiting example, the aforementioned groove 122 can be formed as a three-phase system, including a first phase, a second phase, and a third phase, wherein the first phase, the second phase, and the third phase can each be composed of the same number of grooves 122a, 122b, and 122c.

[0086] The first phase mentioned above may include U, U' and U", the second phase mentioned above may include V, V' and V", and the third phase mentioned above may include W, W' and W".

[0087] As a specific example, such as Figures 4 to 6 As shown, when the stator 100 of the electric motor, which includes a stator 100 of an electric motor and a rotor 1200 of a total of 10 magnets 1220 extending inward from the non-circular yoke 121 with 9 slots 122a, 122b, and 122c, and the rotor 1200 together are implemented as an inner rotor type electric motor with a 9:10 structure, the first phase including the above-mentioned U, U', and U”, the second phase including the above-mentioned V, V', and V”, and the third phase including the above-mentioned W, W', and W” can be formed by 3 slots 122a, 122b, and 122c respectively, and at least some slots 122a, 122b, and 122c can have teeth of different lengths.

[0088] That is, such as Figure 4As shown, the tooth T lengths of a groove 122a forming the U” phase in the first phase, a groove 122b forming the V phase in the second phase, and a groove 122c forming the W’ phase in the third phase can be relatively smaller than the tooth T lengths of the multiple grooves forming the U, U’, V’, V”, W, and W”. In this case, the tooth T lengths of the multiple grooves forming the U, U’, V’, V”, W, and W” can be the same.

[0089] Similarly, such as Figure 5 As shown, the tooth T lengths of a groove 122a forming the U” phase in the first phase, a groove 122b forming the V phase in the second phase, and a groove 122c forming the W” phase in the third phase can be relatively smaller than the tooth T lengths of the multiple grooves forming the U, U', V', V”, W, and W'. In this case, the tooth T lengths of the multiple grooves forming the U, U', V', V”, W, and W' can be the same.

[0090] And, as Figure 6 As shown, the tooth T lengths of a groove 122a forming the U' phase in the first phase, a groove 122b forming the V” phase in the second phase, and a groove 122c forming the W phase in the third phase can be the same. The tooth T lengths of the multiple grooves forming the U, U”, V, V’, W’ and W” phases can be relatively shorter or longer than the tooth lengths of the multiple grooves forming the U', V” and W phases.

[0091] As another specific example, such as Figure 9 As shown, when the stator 200 of the electric motor, which includes a stator 200 of an electric motor with nine slots 122a, 122b, and 122c extending outward from the non-circular yoke 221 of a specified length, and the rotor 1200, which has a total of 12 magnets 1220, are implemented together as an external rotor type electric motor with a 3:4 structure, the first phase including the above-mentioned U, U', and U”, the second phase including the above-mentioned V, V', and V”, and the third phase including the above-mentioned W, W', and W” can be formed by three slots 122a, 122b, and 122c respectively, and at least some of the slots 122a, 122b, and 122c can have teeth of different lengths.

[0092] That is, such as Figure 9 As shown, the tooth T lengths of the two grooves 122a forming the U and U” phases in the first phase, the groove 122b forming the V” phase in the second phase, and the groove 122c forming the W” phase in the third phase can be the same. The tooth T lengths of the multiple grooves forming the U’, V, V’, W’ and W’ phases can be relatively shorter or longer than the tooth lengths of the multiple grooves forming the U, U”, V” and W” phases.

[0093] As described above, in the stator cores 120 and 220 of one embodiment of the present invention, the tooth length T of each slot extending a predetermined length from the arcuate portions 121c, 121d, and 221c in the non-circular yokes 121 and 221 can be the same, and the tooth length of each slot extending a predetermined length from the straight portions 121a, 121b, 221a, and 221b in the yokes 121 and 221 can be relatively shorter or longer than the tooth length of each slot extending a predetermined length from the arcuate portions 121c, 121d, and 221c.

[0094] At this time, the first total number of turns obtained by adding the number of turns of the coil 110 that forms the U, U', and U” phases as the first phase, the second total number of turns obtained by adding the number of turns of the coil 110 that forms the V, V', and V” phases as the second phase, and the third total number of turns obtained by adding the number of turns of the coil 110 that forms the W, W', and W” phases as the third phase can be the same.

[0095] As a non-limiting example, the first total number of turns, the second total number of turns, and the third total number of turns can be 47 turns. In this case, the coil 110 can be wound with 22 turns each in the two slots 122a forming the U phase and U' phase in the first phase, and with 3 turns in the slot 122a forming the U” phase. Similarly, the coil 110 can be wound with 22 turns each in the two slots 122a forming the V' phase and V” phase in the second phase, and with 3 turns in the slot 122a forming the V phase. Likewise, the coil 110 can be wound with 22 turns each in the two slots 122a forming the W phase and W” phase in the third phase, and with 3 turns in the slot 122a forming the W' phase.

[0096] Therefore, the total number of turns of the coil 110 wound in the three slots 122a forming the first phase, the total number of turns of the coil 110 wound in the three slots 122b forming the second phase, and the total number of turns of the coil 110 wound in the three slots 122c forming the third phase can all be the same 47 turns.

[0097] However, the number of turns of the coil 110 wound around the above-mentioned slots 122a, 122b, and 122c is not limited to this and can be appropriately changed according to the position of the slots and / or the length of the teeth.

[0098] Thus, the stators 100 and 200 for an electric motor according to an embodiment of the present invention can be configured such that even if the yokes 121 and 221 are non-circular, and at least some of the slots 122a, 122b, and 122c extending from the yokes 121 and 221 have different tooth T lengths, the total number of turns of the coils wound around the slots 122a, 122b, and 122c forming each phase are the same, and the shoe-shaped parts S formed at the ends of each slot 122a, 122b, and 122c are located on the same virtual circumference.

[0099] Therefore, even if the yokes 121 and 221 are non-circular, the shoe-shaped S portions forming the slots 122a, 122b, and 122c of each phase can be configured to surround or be surrounded by the magnet 1220 at the same distance as the magnet 1220 of the rotor 1200, and the coil 110 can be wound around all slots 122a, 122b, and 122c with an appropriate number of turns.

[0100] Therefore, an electric motor using stators 100 and 200 of an electric motor according to an embodiment of the present invention can be configured such that even if the length of the teeth T forming slots 122a, 122b, and 122c of each phase has different lengths depending on the shape of the yokes 121 and 221, and the total number of turns of the coils 110 wound around the multiple slots forming each phase is the same, the shoe-shaped object S of each slot is also located at the same distance from the magnet 1220, thus achieving a uniform driving force.

[0101] Furthermore, in an electric motor using stators 100 and 200 of an electric motor according to an embodiment of the present invention, the number of turns of the coil 110 wound around each tooth T can be freely changed according to the length of the tooth T, so the yokes 121 and 221 can be in various shapes.

[0102] Therefore, even if mechanical interference occurs during the fixing process of the stators 100 and 200 for the electric motor in one embodiment of the present invention, the mechanical interference problem can be solved by changing the shape of the yokes 121 and 221, thereby improving the design freedom.

[0103] That is, during the process of installing the stators 100 and 200 of the electric motor into the housing of the electric motor, if it is necessary to fasten fastening components such as bolts to the yoke 221 side, the fastening part can be formed at the appropriate position of the yoke 121 and 221 by changing the shape of the yoke 121 and 221 and the tooth length of the groove.

[0104] Therefore, the electric motor with stators 100 and 200 for electric motors using an embodiment of the present invention can achieve uniform driving force while ensuring design freedom.

[0105] In addition, refer to Figure 10Even if the rotor shaft 1210 constituting the electric motor 1000 is positioned off to one side from the center of the housing 1100, the plurality of slots 122a, 122b, and 122c can be configured to surround the entire circumference of the rotor 1200 with the coil 110 wound with an appropriate number of turns.

[0106] Therefore, referring to Figure 12 Even if the electric motor 1000 is installed in a specified position within a limited space with a specified size and shape, such that the rotor shaft 1210 is eccentrically connected to the drive rod 2, the multiple slots 122a, 122b, and 122c can be configured to surround the entire periphery of the rotor 1200.

[0107] Therefore, the electric motor with stators 100 and 200 for electric motors using an embodiment of the present invention can achieve uniform driving force while ensuring design freedom.

[0108] The accompanying drawings and description illustrate a 9:10 multiphase motor with a total of 9 slots 122a, 122b, 122c and a total of 10 magnets 1220 of the rotor 1200, when the stator 100, 200 of an electric motor according to an embodiment of the present invention is applied to a multiphase motor, or a 3:4 multiphase motor with a total of 9 slots 122a, 122b, 122c and a total of 12 magnets 1220 of the rotor 1200. However, the present invention is not limited to these, and can be applied without restriction as long as the total number of slots is 6 or more.

[0109] As an example, the stators 100 and 200 for electric motors according to an embodiment of the present invention can be applied not only to electric motors with a 3:2 structure having a total of 9 slots and 6 magnets, but also to electric motors with a 9:8 structure having a total of 9 slots and 8 magnets.

[0110] Furthermore, the stators 100 and 200 for electric motors according to an embodiment of the present invention can be applied not only to three-phase motors with the above-described structure, but also to multi-phase motors with other structures.

[0111] Furthermore, the accompanying drawings and description illustrate an embodiment of the present invention in which the coil 110 in the stator 100, 200 of an electric motor is wound in all slots 122a, 122b, 122c. However, this is not a limitation. As long as the total number of turns of the coil wound in the multiple slots forming each phase is the same, the coil may be wound in some slots of the multiple slots.

[0112] On the other hand, the stators 100 and 200 of the above-mentioned electric motor can be implemented as electric motor 1000.

[0113] The electric motor 1000 of one embodiment of the present invention described above can be applied to various devices, such as industrial equipment, household appliances, vehicles, etc.

[0114] As a non-limiting example, the electric motor 1000 described above can be used to open / close a valve installed in a vehicle, such as an engine intake valve for regulating the intake air volume of the vehicle's engine. In this case, the valve can be opened / closed by a drive rod 2, and the electric motor 1000 can provide a driving force that moves the drive rod 2. However, the application of the electric motor 1000 according to this embodiment of the invention is not limited to this.

[0115] For ease of explanation, the following description will take an electric motor 1000 of an embodiment of the present invention as an example of an electric motor for driving vehicle valves.

[0116] That is, such as Figure 10 As shown, an electric motor 1000 according to an embodiment of the present invention may include a housing 1100, a rotor 1200, and a stator 100, wherein the stator 100 may be... Figures 1 to 4 The stator 100 for the electric motor shown is shown.

[0117] However, the stator 100 for the electric motor described above is not limited to this and can be used in the same way. Figures 5 to 9 The rotor 1200 can be appropriately modified according to the shape of the stator 100 and 200, as shown in the stator 200. That is, the rotor 1200 can be changed into an inner rotor type rotor or an outer rotor type rotor according to the shape of the stator.

[0118] The aforementioned housing 1100 can be installed in a vehicle, such as the engine compartment of the vehicle, and the aforementioned rotor 1200 and stator 100 can be installed inside it.

[0119] A connecting portion 1110 may be formed on one side of the housing 1100 as described above, so that the drive rod 2, which engages with the gear of the rotor 1200, can enter.

[0120] Furthermore, the aforementioned housing 1100 may include a connector portion 1120 for electrical connection with a circuit board (not shown) disposed inside, so as to control the drive of the aforementioned rotor 1200 and stator 100.

[0121] The housing 1100 described above can also be made of a heat-dissipating material to dissipate the heat generated during operation to the outside. As an example, the housing 1100 can be made of a known heat-dissipating plastic material.

[0122] The rotor 1200 may include a plurality of magnets 1220 disposed around a rotor shaft 1210 having a specified length, and is rotatably mounted on the housing 1100.

[0123] That is, the rotor 1200 may include: a rotor shaft 1210 rotatably mounted on the housing 1100; and a rotor core 1230 formed around the rotor shaft 1210, wherein the plurality of magnets 1220 may be arranged along the circumferential direction of the rotor core 1230.

[0124] like Figure 11 As shown, the rotor 1200 described above can be configured to be located inside the stator 100. Thus, when current is supplied to the coil 110 of the stator 100, the rotor 1200 can rotate by interacting with the magnetic field generated from the coil 110.

[0125] At this time, the rotor shaft 1210 can be engaged with the drive rod 2 gear, which enters the interior of the housing 1100 through the coupling part 1110, via a gear section. The rotor shaft 1210 can be eccentrically connected to the drive rod 2 inside the housing 1100. As an example, the gear section can be a worm gear 3 and a worm 4.

[0126] Specifically, if Figure 12 and Figure 13 As shown, the rotor shaft 1210 can be rotatably mounted at a position eccentric to the center of the housing 1100, and the drive rod 2 can be configured in a direction consistent with the virtual central axis of the housing 1100.

[0127] In this case, such as Figure 11 and Figure 13 As shown, the worm gear 3 can be coupled to the end side shaft of the rotor shaft 1210, as described above. Figure 13 As shown, a worm 4 that engages with the worm gear 3 can be provided on the side of the drive rod 2.

[0128] Therefore, the rotor shaft 1210 and the drive rod 2 can be eccentrically connected via the worm gear 3 and worm 4. If the rotor shaft 1210 rotates, the drive rod 2 can reciprocate along the rotation direction of the rotor shaft 1210. Thus, the valve connected to the drive rod 2 can be opened / closed along the movement direction of the drive rod 2.

[0129] The stator 100 can be configured as a magnet 1220 surrounding the rotor 1200.

[0130] That is, the stator 100 may include at least one coil 110 and a stator core 120. The stator core 120 may include a yoke 121 and a slot 122. The coil 110 may be wound around the slot 122.

[0131] The stator 100 described above can be used as is. Figures 1 to 4The stator 100 for the electric motor described above.

[0132] That is, as described above, the yoke 121 can be in a non-circular closed-loop shape, and the groove 122 can be composed of multiple grooves 122a, 122b, and 122c.

[0133] The contents of the yoke 121 and groove 122 described above are the same as those described above, so a detailed description will be omitted.

[0134] Therefore, as Figure 12 As shown, in one embodiment of the present invention, the electric motor 1000 can be configured such that the rotor shaft 1210 is installed inside the housing 1100 at a position offset to one side rather than in the center of the housing 1100. Even if the drive rod 2 is eccentrically connected to the rotor shaft 1210, the plurality of slots 122a, 122b, 122c of the winding coil 110 can be configured to surround the rotor shaft 1210.

[0135] In particular, such as Figure 10 and Figure 12 As shown, when the stator core 120 is installed inside the housing 1100 such that the first straight portion 121a is parallel to the inner wall of the housing 1100, the space utilization rate within the limited space can be maximized.

[0136] That is, even if the rotor shaft 1210 is positioned off to one side from the center of the housing 1100 so as to be eccentrically connected to the drive rod 2, regardless of the length of the tooth T, the coil 110 is wound with an appropriate number of turns around the tooth T of all slots 122a, 122b, and 122c, thereby achieving maximum torque and maximum efficiency.

[0137] Therefore, when the rotor shaft 1210 is positioned off-center from the center of the housing 1100 to allow for eccentric connection with the drive rod 2, as... Figure 14 As shown, the existing electric motor 1 is configured such that the multiple slots 122a, 122b, 122c around the winding coil only surround a portion of the entire circumference of the rotor 20, but as... Figure 12 As shown, an electric motor 1000 according to an embodiment of the present invention can be configured such that all slots 122a, 122b, 122c of the coil 110 wound around each slot 122a, 122b, 122c surround the entire circumference of the rotor 1200 by appropriately changing the number of turns of the coil 110 wound around each slot 122a, 122b, 122c.

[0138] Thus, the electric motor 1000 of one embodiment of the present invention can be configured such that even within a limited space having a specified size and shape, the rotor shaft 1210 is eccentrically connected to the drive rod 2, and the slots 122a, 122b, and 122c of the winding coil 110 can surround the entire circumference of the rotor 1200.

[0139] Therefore, the electric motor 1000 of one embodiment of the present invention reduces the heat generated during motor operation while maintaining the size, installation position and eccentric connection between the existing housing 1100 and the rotor shaft 1210, thereby preventing efficiency reduction due to heat loss.

[0140] The above describes one embodiment of the present invention. However, the concept of the present invention is not limited to the embodiment described in this specification. Those skilled in the art who understand the concept of the present invention can easily propose other embodiments by adding, changing, deleting, or adding structural elements within the same scope of the concept, but these will also fall within the scope of the present invention.

Claims

1. A stator for an electric motor, characterized in that, include: At least one coil; as well as The stator core includes a yoke in a closed-loop shape and a slot extending a predetermined length from the yoke. The aforementioned tank section includes multiple tanks forming a multiphase system, wherein the multiphase system includes a first phase and a second phase different from the first phase. The total number of turns obtained by adding the number of turns of the coils wound on the multiple slots forming the first phase is the same as the total number of turns obtained by adding the number of turns of the coils wound on the multiple slots forming the second phase. The aforementioned yoke includes: The first arc portion has a predetermined curvature; The second arc portion has a predetermined curvature and is configured not to be connected to the first arc portion described above; A first straight section, used to connect one end of the first arcuate section and the second arcuate section; and The second straight section is used to connect the other end of the first arcuate section and the second arcuate section. The second straight section includes a first portion connected to the end of the first arcuate section and a second portion connected to the end of the first portion and connected to the end of the second arcuate section. The second part is connected to one end of the first part at a predetermined angle other than 0 degrees. The portion connecting the first and second parts is connected in a manner that protrudes inward toward the yoke. The aforementioned yoke is non-circular, and The first and second arc portions mentioned above have different lengths.

2. The stator for an electric motor according to claim 1, characterized in that, At least some of the aforementioned slots are formed such that the lengths of the teeth wound around the coil are different.

3. The stator for an electric motor according to claim 1, characterized in that, The aforementioned grooves extend inward from the aforementioned yoke by a specified length.

4. The stator for an electric motor according to claim 1, characterized in that, The aforementioned tank section is formed as a three-phase system including U phase, V phase, and W phase.

5. An electric motor, characterized in that, include: shell; The rotor includes a rotor shaft rotatably mounted on the aforementioned housing and a plurality of magnets arranged along the circumferential direction of the aforementioned rotor shaft. as well as The stator, fixed to the aforementioned housing, has a coil wound in at least one slot. The stator described above is a stator for an electric motor according to any one of claims 1 to 4.

6. The electric motor according to claim 5, characterized in that, The rotor shaft is engaged with a drive rod gear that enters the interior of the housing via a gear assembly. The aforementioned drive rod is eccentrically connected to the aforementioned rotor shaft via a gear section.

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