Stator for an electric motor and electric motor including the same

Abstract

A stator for an electric motor is provided. The stator for an electric motor according to an exemplary embodiment of the present invention includes: at least one coil; and a stator core including a yoke in a closed-loop shape and a slot portion extending a predetermined length from the yoke, the slot portion including at least one first slot around which the coil is wound and at least one second slot around which the coil is not wound, the at least one first slot and the at least one second slot forming the same one phase.

Description

Technical Field

[0001] The present invention relates to a stator for an electric motor and an electric motor including the same. Background Art

[0002] An electric motor is a device that generates driving force using electric energy. Such electric motors are widely used in various electronic devices, household appliances, automobiles, etc.

[0003] As an example, an electric motor is applied to an automotive engine to provide driving force for driving an intake valve.

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

[0005] By driving the motor, a driving rod connected to the intake valve reciprocates to open / close the intake valve. For this purpose, an electric motor for operating the driving rod of the intake valve is disposed in the engine compartment.

[0006] However, since various components are disposed in the engine compartment of the vehicle, the installation space is limited.

[0007] Therefore, as Figure 21 shown, in an existing electric motor 1 for vehicle valve drive including a rotor 20 and a stator 30, there is a limitation in that the rotor shaft 22 of the rotor 20 can only be eccentrically connected to the drive rod 2 by means of a worm wheel 3 and a worm 4.

[0008] That is, due to the space limitation in the engine compartment, considering the connection between the rotor shaft 22 and the drive rod 2, there is a limitation in that the slots 32 in which the coils 40 are wound in the stator 30 can only be formed in a direction biased to one side in the housing 10.

[0009] Therefore, the existing electric motor 1 for vehicle valve drive has problems of reduced power and efficiency.

[0010] To solve the above problems, considering the eccentric connection between the rotor shaft 22 and the drive rod 2, when changing the size of the housing 10 that fixes the stator 30 or changing the installation position of the housing 10 installed in the engine compartment, interference may occur with various other components disposed in the engine compartment, or the arrangement positions of various other components should be changed.

[0011] Thus, there is a problem of needing to redesign the overall design of the automotive engine compartment. Summary of the Invention

[0012] Technical Problem

[0013] The present invention is proposed in view of the above-described problems, and an object thereof is to provide a stator for an electric motor and an electric motor including the same, which can improve the efficiency of the motor and ensure design freedom without changing the conventional mounting position even when mounted in a limited installation space such as an engine room.

[0014] Means for solving the problem

[0015] To solve the above problems, the present invention provides a stator for an electric motor, including: at least one coil; and a stator core including a yoke in a closed-loop shape and a slot portion extending a predetermined length from the yoke, the slot portion including at least one first slot around which the coil is wound and at least one second slot around which the coil is not wound, the at least one first slot and the at least one second slot forming the same phase.

[0016] Moreover, the first slot and the second slot may extend a predetermined length inward from the yoke.

[0017] Alternatively, the first slot and the second slot may extend a predetermined length outward from the yoke.

[0018] Moreover, the slot portion may form multiple phases, the multiple phases including a first phase and a second phase different from the first phase, and the slot portion may include multiple first slots around which the coil is wound and multiple second slots around which the coil is not wound.

[0019] In this case, the slots forming the first phase in the slot portion may include at least one of the first slots and at least one of the second slots, and the slots forming the second phase in the slot portion may include at least one of the first slots and at least one of the second slots. Also, the number of the first slots forming the first phase may be the same as the number of the first slots forming the second phase, and the length of the first slots forming the first phase may be the same as the length of the first slots forming the second phase.

[0020] Moreover, the slot portion may include multiple first slots around which the coil is wound and multiple second slots around which the coil is not wound, and the lengths of at least some of the multiple second slots may be different from the length of the first slots.

[0021] Moreover, the yoke may be circular.

[0022] Alternatively, the yoke may be non-circular including at least one straight portion. As an example, the yoke may include: at least one arc portion having a predetermined curvature; and at least one straight portion connected to an end of the arc portion.

[0023] In this case, the first slot may be a slot extending a predetermined length from the arc portion, and the second slot may be a slot extending a predetermined length from the straight portion.

[0024] Further, in the above yoke, the above arc portion may include a first arc portion and a second arc portion that are not connected to each other, and the above straight portion may include a first straight portion connecting one end portion of the above first arc portion and the second arc portion, and a second straight portion connecting the other end portion of the above first arc portion and the second arc portion.

[0025] At this time, the above second straight portion may include a first portion connected to the end portion of the above first arc portion, and a second portion connected to the end portion of the above first portion and connected to the end portion of the above second arc portion, and the above second portion can be connected to one end portion of the above first portion at a predetermined angle other than 0 degrees with respect to the above first portion.

[0026] On the other hand, the present invention provides an electric motor, which includes: a housing; a rotor including a rotor shaft rotatably mounted in the above housing and a plurality of magnets arranged along the circumferential direction of the above rotor shaft; and a stator fixed to the above housing and having coils wound in at least one slot. Among them, the above stator is a stator for the above electric motor.

[0027] And, the above rotor shaft can be gear-coupled with a drive rod that enters the interior of the above housing through a gear portion, and the above drive rod can be eccentrically connected to the above rotor shaft through a gear portion.

[0028] Effects of the Invention

[0029] According to the present invention, even when installed at the same position as before in a limited installation space such as an engine room, high power and efficiency can be achieved without redesigning the surrounding related components.

[0030] And, according to the present invention, the position of the slot in the stator where the coil is wound can be freely changed, thereby improving the design freedom. Brief Description of the Drawings

[0031] Figure 1 A view showing a stator for an electric motor according to an embodiment of the present invention.

[0032] Figure 2 For showing Figure 1 The state where the coil is removed in

[0033] Figure 3 For Figure 2 The top view of

[0034] Figure 4 A view showing the configuration relationship between the slot portion of the stator core and the magnets of the rotor in a stator for an electric motor according to an embodiment of the present invention.

[0035] Figure 5 For showing what can be applied to Figure 4Another form of the stator core.

[0036] Figure 6 To show an application to Figure 4 Another form of the stator core.

[0037] Figure 7 A diagram showing the stator for an electric motor according to another embodiment of the present invention.

[0038] Figure 8 To show Figure 7 The state with the coil removed.

[0039] Figure 9 To show Figure 7 The arrangement relationship between the slot portion of the stator core and the magnet of the rotor in the stator for an electric motor.

[0040] Figure 10 To show an application to Figure 9 Another winding method of the coil.

[0041] Figure 11 To show an application to Figure 9 Another winding method of the coil.

[0042] Figure 12 A diagram showing the stator for an electric motor according to another embodiment of the present invention.

[0043] Figure 13 To show Figure 12 The state with the coil removed.

[0044] Figure 14 To show Figure 12 The arrangement relationship between the slot portion of the stator core and the magnet of the rotor in the stator for an electric motor.

[0045] Figure 15 To show an application to Figure 12 Another winding method of the coil.

[0046] Figure 16 To show an application to Figure 12 Another winding method of the coil.

[0047] Figure 17 A diagram showing the electric motor with the stator for an electric motor according to an embodiment of the present invention applied.

[0048] Figure 18 To show Figure 17 The rotor and stator intercepted therefrom.

[0049] Figure 19 Briefly showing Figure 17View of the state where the electric motor is connected to the drive rod.

[0050] Figure 20 To show Figure 19 View of the rotor, stator, and drive rod taken from

[0051] Figure 21 Schematic diagram showing the connection relationship between the drive rod and the rotor shaft in a conventional electric motor. Detailed Description of the Invention

[0052] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art to which the present invention pertains can easily implement it. However, the present invention can be implemented in various different ways, and thus is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted to clearly illustrate the present invention, and throughout the specification, the same or similar structural elements are given the same reference numerals.

[0053] As Figure 1 , Figure 7 and Figure 12 shown, the stators 100, 200, 300 for an electric motor according to an embodiment of the present invention may include at least one coil 110 and stator cores 120, 220, 320, and the at least one coil 110 may be wound around the stator cores 120, 220, 320.

[0054] That is, the stator cores 120, 220, 320 may include yokes 121, 221 and slot portions 122, 222, and the coil 110 may be wound around the slot portions 122, 222.

[0055] As Figure 2 , Figure 8 and Figure 13 shown, the stator cores 120, 220, 320 as described above may be in a form in which a plurality of metal sheets each including the yokes 121, 221 and the slot portions 122, 222 are laminated in multiple layers, but are not limited thereto and may also be formed of one component.

[0056] At this time, the yokes 121, 221 may be in a closed-loop shape. That is, the yokes 121, 221 may be non-circular including at least one straight portion or circular with a predetermined curvature.

[0057] As an example, as Figures 1 to 6 shown, the yoke 121 may include at least one straight portion 121a, 121b and at least one arc portion 121c, 121d formed in a manner having a predetermined curvature, and the straight portions 121a, 121b and the arc portions 121c, 121d may be connected.

[0058] Thus, in the above-mentioned yoke 121, the above-mentioned straight portions 121a, 121b are connected to the arc portions 121c, 121d, so that it can have a non-circular closed-loop shape.

[0059] As a non-limiting example, as Figures 4 to 6 shown, in the stator cores 120, 120', 120", the above-mentioned yoke 121 can have a non-circular closed-loop shape through the arc portions 121c, 121d including the first arc portion 121c and the second arc portion 121d and the straight portions 121a, 121b including the first straight portion 121a and the second straight portion 121b.

[0060] In this case, the above-mentioned first arc portion 121c and the second arc portion 121d may not be connected, and the above-mentioned first straight portion 121a and the second straight portion 121b may be respectively connected to the ends of the above-mentioned first arc portion 121c and the second arc portion 121d.

[0061] At this time, as Figures 1 to 4 shown, in the above-mentioned stator core 120, the above-mentioned first arc portion 121c and the second arc portion 121d may have the same length, but as Figure 5 and Figure 6 shown, in the above-mentioned stator cores 120', 120", the above-mentioned first arc portion 121c and the second arc portion 121d may have different lengths.

[0062] In addition, as Figures 1 to 6 shown, in the above-mentioned stator cores 120, 120', 120", at least one of the above-mentioned first straight portion 121a and the second straight portion 121b may be formed such that a part of the length 121b' that is not a straight line has a predetermined length with respect to the remaining length 121b".

[0063] Thus, the above-mentioned yoke 121 can be changed into various shapes according to the arrangement position, length, and shape of the first straight portion 121a and / or the second straight portion 121b connecting the above-mentioned first arc portion 121c and the second arc portion 121d.

[0064] As a specific example, as Figure 4 shown, in the above-mentioned stator core 120, the above-mentioned 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 above-mentioned first arc portion 121c and the second arc portion 121d may be straight, and the second straight portion 121b connecting the other end of the above-mentioned first arc portion 121c and the second arc portion 121d may include a first portion 121b' and a second portion 121b" connected at a predetermined angle.

[0065] In this case, one end of the first part 121b' can be connected to the end of the first arc part 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 part 121d, and the other end can be connected to the first part 121b'.

[0066] At this time, the second part 121b" can be connected to one end of the first part 121b' in such a way as to have a predetermined angle other than 0 degrees with the first part 121b', and the part where the first part 121b' is connected to the second part 121b" can be connected in a way that protrudes toward the inside of the yoke 121.

[0067] As another example, as Figure 5 shown, in the stator core 120', the first arc part 121c and the second arc part 121d can have different lengths. The first straight part 121a connecting one end of the first arc part 121c and the second arc part 121d can be straight, and the second straight part 121b connecting the other end of the first arc part 121c and the second arc part 121d can include a first part 121b' and a second part 121b" connected in such a way as to form a predetermined angle.

[0068] In this case, one end of the first part 121b' can be connected to the end of the first arc part 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 part 121d, and the other end can be connected to the first part 121b'.

[0069] At this time, the second part 121b" can be connected to one end of the first part 121b' in such a way as to have a predetermined angle other than 0 degrees with the first part 121b', and the part where the first part 121b' is connected to the second part 121b" can be connected in a way that protrudes toward the inside of the yoke 121.

[0070] As another example, as Figure 6 shown, in the stator core 120", the first arc part 121c and the second arc part 121d can have different lengths. The first straight part 121a connecting one end of the first arc part 121c and the second arc part 121d can be straight, and the second straight part 121b connecting the other end of the first arc part 121c and the second arc part 121d can include a first part 121b' and a second part 121b" connected in such a way as to form a predetermined angle.

[0071] In this case, one end of the above-mentioned first part 121b' can be connected to the end of the above-mentioned first arc part 121c, and the other end can be connected to the above-mentioned second part 121b". One end of the above-mentioned second part 121b" can be connected to the end of the above-mentioned second arc part 121d, and the other end can be connected to the above-mentioned first part 121b'.

[0072] At this time, the above-mentioned second part 121b" can be connected to one end of the above-mentioned first part 121b' in such a way that it has a predetermined angle other than 0 degrees with the above-mentioned first part 121b', and the part where the above-mentioned first part 121b' is connected to the second part 121b" can be connected in a way that protrudes toward the outside of the above-mentioned yoke 121.

[0073] Thus, the above-mentioned yoke 121 can have a closed-loop shape including various shapes of non-circular straight parts.

[0074] As another example, as Figures 7 to 16 shown, the above-mentioned yoke 221 can also be circular with a predetermined curvature.

[0075] However, the present invention is not limited to this, and the above-mentioned yoke can also be in a form in which at least two parts with different curvatures are connected.

[0076] The coil 110 that generates a magnetic field when power is applied can be wound around the above-mentioned groove parts 122, 222. For this purpose, the above-mentioned groove parts 122, 222 can extend a predetermined length inward or outward from the above-mentioned yokes 121, 221 so that the above-mentioned coil 110 can be wound with a predetermined number of turns.

[0077] As an example, as Figures 1 to 6 shown, the above-mentioned groove part 122 can extend a predetermined length inward from the above-mentioned yoke 121.

[0078] The groove part 122 as described above can include a plurality of grooves 122a, 122b. The plurality of grooves 122a, 122b are arranged at intervals along the edge of the above-mentioned yoke 121 and protrude a predetermined length inward from the edge of the above-mentioned yoke 121. As Figure 3 shown, the plurality of grooves 122a, 122b can be arranged to form equal angles with each other based on a virtual center point.

[0079] Thus, as Figures 4 to 6 shown, when the rotor 1200 constituting the electric motor 1000 is arranged to be located at the central part of the above-mentioned yoke 121 together with the magnet 1220, the plurality of grooves 122a, 122b can be arranged to surround the above-mentioned rotor 1200, and the plurality of grooves 122a, 122b can be arranged at equal angles along the periphery of the above-mentioned rotor 1200. Therefore, the above-mentioned electric motor 1000 can be implemented as an inner-rotor type motor.

[0080] As another example, as Figures 7 to 16 shown, the above-mentioned groove portion 222 can extend a predetermined length outward from the above-mentioned yoke 221.

[0081] The groove portion 222 as described above may include a plurality of grooves 222a, 222b. The plurality of grooves 222a, 222b are arranged at intervals along the edge of the above-mentioned yoke 221 and protrude a predetermined length outward from the edge of the above-mentioned yoke 221. The plurality of grooves 222a, 222b can be arranged to form equal angles with each other based on the center point of the above-mentioned yoke 221.

[0082] Thus, as Figure 9 , Figure 10 , Figures 14 to 16 shown, the magnet 1220 constituting the rotor 1200 can be arranged to surround the groove portion 222 outside the above-mentioned yoke 221, and the rotor shaft constituting the above-mentioned rotor 1200 can be arranged at the central portion of the above-mentioned yoke 221. Thus, the above-mentioned electric motor can be realized as an outer rotor type motor.

[0083] At this time, the coil 110 wound around the groove portions 122, 222 can be wound only around some of the grooves 122a, 122b, 222a, 222b constituting the groove portions 122, 222, such as 122a, 222a.

[0084] That is, the above-mentioned groove portions 122, 222 may include at least one first groove 122a, 222a around which the coil 110 is wound and at least one second groove 122b, 222b around which the coil 110 is not wound.

[0085] Among them, the above-mentioned first grooves 122a, 222a and second grooves 122b, 222b may respectively include teeth T extending a predetermined length inward or outward from the above-mentioned yokes 121, 221 and shoe-shaped objects S formed at the ends of the above-mentioned teeth T. The coil 110 can be wound around the teeth T of the above-mentioned first grooves 122a, 222a.

[0086] In this case, the above-mentioned at least one first groove 122a, 222a and the above-mentioned at least one second groove 122b, 222b may form the same phase.

[0087] That is, when the stators 100, 200 of the electric motor according to an embodiment of the present invention are applied to a single-phase motor, the above-mentioned first grooves 122a, 222a and the second grooves 122b, 222b may form the same phase. When there are a plurality of the above-mentioned first grooves 122a, 222a, the teeth T of the plurality of first grooves 122a, 222a may have the same length.

[0088] At this time, as Figures 1 to 3As shown, when the stator core 120 of an embodiment of the present invention includes a plurality of slots extending inwardly by a predetermined length from a non-circular yoke 121, the first slot 122a may extend inwardly by a predetermined length from the arc portions 121c and 121d of the yoke 121, and the second slot 122b may extend inwardly by a predetermined length from the straight portions 121a and 121b of the yoke 121.

[0089] Thus, even if the yoke 121 is in the form of a non-circular closed-loop shape as described above and has a plurality of first slots 122a, the length of each first slot 122a can be the same, and the shoe-shaped portions S formed at the ends of the first slots 122a and the second slots 122b can also be located on a virtual circumference.

[0090] Therefore, even if the rotor 1200 is disposed inside the yoke 121, the first slot 122a and the second slot 122b constituting the slot portion 122 can be arranged to surround the peripheral surface of the rotor 1200.

[0091] And, as Figures 7 to 11 shown, in the stator core 220 of an embodiment of the present invention, when the yoke 221 is circular, the slot portion 222 may include a plurality of slots 222a and 222b having the same phase, and the plurality of slots 222a and 222b may include at least one first slot 222a around which the coil 110 is wound and at least one second slot 222b around which the coil 110 is not wound.

[0092] As a specific example, as Figures 7 to 11 shown, when the stator core 220 of an embodiment of the present invention includes 4 slots extending outwardly by a predetermined length from a circular yoke 221 and is applied to a 4-pole - 4-slot type single-phase motor with a total number of magnets 1220 being 4, the 4 slots may be constituted by at least one first slot 222a having the same phase and around which the coil 110 is wound and at least one second slot 222b around which the coil 110 is not wound.

[0093] Therefore, even if a mechanical interference problem occurs during the fixing process of the stator core 220, the design freedom can be improved by forming the first slot 222a in such a way that the coil 110 is wound only around some of the plurality of slots. That is, during the process of installing the stator 200 inside the housing of the electric motor, if a fastening member such as a bolt is fastened to the yoke 221 side, the first slot 222a around which the coil 110 is wound can be formed by preventing interference between the yoke 221 and the fastened portion.

[0094] As another example, when the stators 100 and 300 for an electric motor according to an embodiment of the present invention are applied to a multi-phase motor, the slot portions 122 and 222 may include a plurality of first slots 122a and 222a and a plurality of second slots 122b and 222b, the slot portions 122 and 222 may have multiple phases, and the multiple phases include a first phase and a second phase different from the first phase.

[0095] In this case, some of the plurality of first slots 122a and 222a may have the first phase, and some of the plurality of first slots 122a and 222a may have the second phase.

[0096] Similarly, some of the plurality of second slots 122b and 222b may have the first phase, and some of the plurality of second slots 122b and 222b may have the second phase.

[0097] That is, when the slot portions 122 and 222 have multiple phases, the slots forming the first phase in the slot portions 122 and 222 may include at least one first slot 122a and 222a and at least one second slot 122b and 222b, and the slots forming the second phase in the slot portions 122 and 222 may also include at least one first slot 122a and 222a and at least one second slot 122b and 222b.

[0098] In this case, the number of the first slots 122a and 222a forming the first phase may be the same as the number of the first slots 122a and 222a forming the second phase, and the tooth T length of the first slots 122a and 222a forming the first phase may be the same as the tooth T length of the first slots 122a and 222a forming the second phase.

[0099] At this time, as Figures 1 to 6 shown, when the yoke 121 has a non-circular closed-loop shape including at least one straight portion 121a and 121b, the first slot 122a may extend inward by a predetermined length from the arc portions 121c and 121d of the yoke 121, and the second slot 122b may extend inward by a predetermined length from the straight portions 121a and 121b of the yoke 121.

[0100] Thus, even if the yoke 121 has a non-circular closed-loop shape as described above and has a plurality of the first slots 122a and the second slots 122b respectively, the tooth T length of each first slot 122a may be the same, and the shoe-shaped S portions formed at the ends of the plurality of first slots 122a and second slots 122b may also be located on a virtual circumference.

[0101] Therefore, as Figures 4 to 6As shown, when the rotor 1200 is disposed inside the yoke 121 described above, the plurality of first slots 122a and second slots 122b constituting the slot portion 122 can be disposed around the peripheral surface of the rotor 1200.

[0102] And, as Figures 12 to 16 shown, when the yoke 221 has a circular closed-loop shape, the first slots 222a and second slots 222b can extend a predetermined length outward from the edge of the yoke 221, and the teeth T of the first slots 222a and the teeth T of the second slots 222b can have the same length.

[0103] Accordingly, even when the yoke 221 has a circular closed-loop shape and has a plurality of the first slots 222a and second slots 222b respectively, the shoe portions S formed at the ends of the plurality of first slots 222a and second slots 222b can be located on a virtual circumference.

[0104] Therefore, as Figures 14 to 16 shown, when the magnet 1220 is disposed outside the yoke 221 to surround the slot portion 222, each shoe portion S of the plurality of first slots 222a and second slots 222b constituting the slot portion 222 can be disposed to face the magnet 1220.

[0105] As a non-limiting example, the slot portions 122 and 222 can be formed in three phases, the three phases including a first phase, a second phase, and a third phase. The slot portions 122 and 222 can include a plurality of first slots 122a and 222a and a plurality of second slots 122b and 222b. The first phase, the second phase, and the third phase can be respectively constituted by the same number of first slots 122a and 222a and second slots 122b and 222b.

[0106] As a specific example, as Figure 4 and Figure 5 shown, in the case of an electric motor having a 9:10 structure of a stator 100 in which the yoke 121 has a non-circular closed-loop shape and the total number of slots 122a and 122b extending a predetermined length from the yoke 121 is 9, and a rotor 1200 in which the total number of magnets 1220 is 10, the first phase can include U, U', and U'', the second phase can include V, V', and V'', and the third phase can include W, W', and W''.

[0107] In this case, the first phase, the second phase, and the third phase can be respectively formed by 3 slots 122a and 122b, and each phase can include 2 first slots 122a and 1 second slot 122b.

[0108] That is, U and U' that constitute the first phase can be formed by two first slots 122a, and the remaining U" that constitutes the first phase can be formed by one second slot 122b.

[0109] Moreover, V' and V" that constitute the second phase can be formed by two first slots 122a, and the remaining V that constitutes the second phase can be formed by one second slot 122b.

[0110] Similarly, W and W" that constitute the third phase can be formed by two first slots 122a, and the remaining W' that constitutes the third phase can be formed by one second slot 122b.

[0111] In this case, the length of the second slot 122b that forms U", V, and W' can be relatively shorter than the length of the first slot 122a that forms U, U', V', V", W, and W", and the first slots 122a that form U, U', V', V", W, and W" can have the same length.

[0112] Moreover, the first slots 122a that form U, U', V', V", W, and W" can extend from the arc portions 121c and 121d of the yoke 121, and the second slots 122b that form U", V, and W' can extend from the straight portions 121a and 121b of the yoke 121.

[0113] Thus, each shoe S of the first slot 122a and each shoe S of the second slot 122b are arranged at the same distance around the magnet 1220 provided on the rotor 1200.

[0114] That is, each shoe S of the first slot 122a and each shoe S of the second slot 122b can be arranged to be located on a virtual circumference centered on the rotor shaft 1210 provided on the rotor 1200.

[0115] Therefore, even if the yoke 121 is non-circular, the coil 110 can be wound around each first slot 122a having the same length with the same number of turns. Since the first slots 122a and the second slots 122b that form each phase can be arranged to surround the magnet 1220 of the rotor 1200 at the same distance, a uniform driving force can be achieved.

[0116] Similarly, as Figure 6As shown, in the case of an electric motor with a 9:10 structure including a stator 100 in which the yoke 121 has a non-circular closed-loop shape and the total number of slots 122a and 122b extending a predetermined length from the yoke 121 is 9, and a rotor 1200 with a total number of magnets 1220 being 10, the first phase may include U, U', and U", the second phase may include V, V', and V", and the third phase may include W, W', and W".

[0117] In this case, the first phase, the second phase, and the third phase may be formed by 3 slots 122a and 122b respectively, and each phase may include one first slot 122a and two second slots 122b.

[0118] That is, U' constituting the first phase may be formed by one first slot 122a, and the remaining U and U" constituting the first phase may be formed by two second slots 122b.

[0119] And, V" constituting the second phase may be formed by one first slot 122a, and the remaining V and V' constituting the second phase may be formed by two second slots 122b.

[0120] Similarly, W constituting the third phase may be formed by one first slot 122a, and the remaining W' and W" constituting the third phase may be formed by two second slots 122b.

[0121] In this case, the length of the second slots 122b forming U, U", V, V', W', and W" may be relatively shorter than the length of the first slots 122a forming U', V", and W, and the lengths of the first slots 122a forming U', V", and W may be different.

[0122] And, the first slots 122a forming U', V", and W may extend from the arc portions 121c and 121d of the yoke 121, and the second slots 122b forming U, U", V, V', W', and W" may extend from the straight portions 121a and 121b of the yoke 121.

[0123] Thus, each shoe S of the first slots 122a and each shoe S of the second slots 122b may be arranged to surround the magnet 1220 provided on the rotor 1200 at the same distance.

[0124] That is, each shoe S of the first slots 122a and each shoe S of the second slots 122b may be arranged to be located on a virtual circumference centered on the rotor shaft 1210 provided on the rotor 1200.

[0125] Therefore, the above-mentioned yoke 121 is non-circular, and the coil 110 can also be wound around each first slot 122a having the same length with the same number of turns. Since the first slots 122a and the second slots 122b forming each phase can be arranged to surround the magnet 1220 of the rotor 1200 at the same distance, a uniform driving force can be achieved.

[0126] Therefore, when using the electric motor 1000 with the stator 100 for an electric motor according to an embodiment of the present invention, as Figure 17 shown, even if the rotor shaft 1210 of the above-mentioned electric motor 1000 is arranged at a position deviated from the center of the housing 1100 to one side, the plurality of first slots 122a and the second slots 122b can be arranged to surround the entire periphery of the above-mentioned rotor 1200.

[0127] Thus, as Figure 19 shown, even if the electric motor 1000 with the stator 100 for an electric motor according to an embodiment of the present invention is installed in a limited space with a specified size and shape, and the above-mentioned rotor shaft 1210 is eccentrically connected to the drive rod 2, the plurality of first slots 122a and the second slots 122b can be arranged to surround the entire periphery of the above-mentioned rotor 1200.

[0128] As described above, in the stator 100 for an electric motor according to an embodiment of the present invention, the yoke 121 is non-circular, so various changes can be made to the overall shape. And even if the shape of the yoke 121 changes, the lengths of each first slot 122a around which the coil 110 is wound can be the same. Therefore, it has the advantages of preventing the reduction of the motor efficiency and improving the design freedom.

[0129] As another example, as Figures 14 to 16 shown, when the yoke 221 has a circular closed-loop shape, and for a 3:4 structure electric motor including a stator 300 with a total of 9 slots 222a and 222b extending a specified length outward from the above-mentioned yoke 221 and a rotor 1200 with a total of 12 magnets 1220, the above-mentioned first phase can include U, U' and U", the above-mentioned second phase can include V, V' and V", and the above-mentioned third phase can include W, W' and W".

[0130] In this case, the above-mentioned first phase, second phase and third phase can be formed by 3 slots 222a and 222b respectively, and each phase can include at least one first slot 222a and at least one second slot 222b.

[0131] That is, as Figure 14 shown, U' and U" constituting the above-mentioned first phase can be formed by two first slots 222a, and the remaining U constituting the above-mentioned first phase can be formed by one second slot 222b.

[0132] Moreover, V and V' that form the second phase can be formed by two first slots 222a, and the remaining V'' that forms the second phase can be formed by one second slot 222b.

[0133] Similarly, W and W' that form the third phase can be formed by two first slots 222a, and the remaining W'' that forms the third phase can be formed by one second slot 222b.

[0134] In this case, the six first slots 222a and three second slots 222b that form each phase can have teeth T of the same length.

[0135] Thus, each shoe S of the first slot 222a and each shoe S of the second slot 222b can be arranged to be located on a virtual circumference with respect to the center point of the yoke 221.

[0136] Similarly, as Figure 15 shown, U' and U'' that form the first phase can be formed by two first slots 222a, and the remaining U that forms the first phase can be formed by one second slot 222b.

[0137] Moreover, V' and V'' that form the second phase can be formed by two first slots 222a, and the remaining V that forms the second phase can be formed by one second slot 222b.

[0138] Similarly, W' and W'' that form the third phase can be formed by two first slots 222a, and the remaining W that forms the third phase can be formed by one second slot 222b.

[0139] In this case, the six first slots 222a and three second slots 222b that form each phase can have teeth T of the same length.

[0140] Thus, each shoe S of the first slot 222a and each shoe S of the second slot 222b can be arranged to be located on a virtual circumference with respect to the center point of the yoke 221.

[0141] As another example, as Figure 16 shown, U' that forms the first phase can be formed by one first slot 222a, and the remaining U and U'' that form the first phase can be formed by two second slots 222b.

[0142] Moreover, V'' that forms the second phase can be formed by one first slot 222a, and the remaining V and V' that form the second phase can be formed by two second slots 222b.

[0143] Similarly, the W' that constitutes the above-mentioned third phase can be formed by a first slot 222a, and the remaining W and W" that constitute the above-mentioned third phase can be formed by two second slots 222b.

[0144] In this case, the 3 first slots 222a and the 6 second slots 222b that form each phase can have teeth T of the same length.

[0145] Accordingly, each shoe S of the above-mentioned first slot 222a and each shoe S of the above-mentioned second slot 222b can be configured to be located on a virtual circumference with the center point of the above-mentioned yoke 221 as a reference.

[0146] As described above, in the stator 300 for an electric motor according to an embodiment of the present invention, even if a plurality of slots 222a and 222b extend the same length from the circular yoke 221, various changes can be made to the position of the wound coil 110 by the first slot 222a in which the coil 110 is wound and the second slot 222b in which the coil 110 is not wound.

[0147] Accordingly, even if a mechanical interference problem occurs during the fixing process of the stator 300 for an electric motor according to an embodiment of the present invention, the design freedom can be improved by configuring the first slot 222a such that the coil 110 is wound only in some of the plurality of slots. That is, during the process of installing the above-mentioned stator 300 in the housing of the electric motor, if a fastening member such as a bolt is fastened to the yoke 221 side, the first slot 222a in which the coil 110 is wound can be configured in various ways by preventing interference between the yoke 221 and the fastened fastening portion.

[0148] In the drawings and the description, a polyphase motor having a 9:10 structure in which the total number of slots 122a and 122b is 9 and the total number of magnets 1220 of the rotor 1200 is 10, or a polyphase motor having a 3:4 structure in which the total number of slots 222a and 222b is 9 and the total number of magnets 1220 of the rotor 1200 is 12, is illustrated when the stator 100 and 300 for an electric motor according to an embodiment of the present invention are applied to a polyphase motor. However, the present invention is not limited thereto, and as long as the total number of slots is 6 or more, it can be applied without limitation.

[0149] As an example, the stator 100 and 300 for an electric motor according to an embodiment of the present invention can be applied not only to an electric motor having a 3:2 structure in which the total number of slots is 9 and the total number of magnets is 6, but also to an electric motor having a 9:8 structure or the like in which the total number of slots is 9 and the total number of magnets is 8.

[0150] Moreover, the stator 100 and 300 for an electric motor according to an embodiment of the present invention can be applied not only to a three-phase motor having the above-mentioned structure, but also to a polyphase motor having other structures.

[0151] Furthermore, in the stators 100 and 300 for an electric motor according to an embodiment of the present invention, the total number of the first slots 122a around which the coil 110 is wound and the total number of the second slots 122b around which the coil 110 is not wound may be the same or different.

[0152] On the other hand, the above-described stators 100, 200, and 300 for an electric motor can be implemented as an electric motor 1000.

[0153] The electric motor 1000 according to an embodiment of the present invention as described above can be applied to various devices, such as industrial equipment, household equipment, vehicles, and the like.

[0154] As a non-limiting example, the above-described electric motor 1000 can be used to open / close a valve provided in a vehicle, and the above valve can be an intake valve of an engine for adjusting the intake air amount of the vehicle engine. In this case, the above valve can be opened / closed by a drive rod 2, and the above electric motor 1000 can provide a driving force that can move the above drive rod 2. However, the application object of the electric motor 1000 according to an embodiment of the present invention is not limited thereto.

[0155] For ease of explanation, hereinafter, an example in which the electric motor 1000 according to an embodiment of the present invention is used as an electric motor for driving a vehicle valve will be described.

[0156] That is, as Figure 17 shown, the electric motor 1000 according to an embodiment of the present invention may include a housing 1100, a rotor 1200, and a stator 100, and the above stator 100 may be Figures 1 to 4 the stator 100 for an electric motor as shown.

[0157] However, the above-described stator 100 for an electric motor is not limited thereto, and the stators 200 and 300 as shown can be similarly applied, and the above rotor 1200 can be appropriately changed according to the forms of the stators 100, 200, and 300. That is, the above rotor 1200 can be changed to an inner rotor type rotor or an outer rotor type rotor according to the form of the above stator. Figures 5 to 16 The above housing 1100 can be installed in a vehicle, such as an engine compartment of the vehicle, and the above rotor 1200 and stator 100 can be provided inside thereof.

[0158] On one side of the above-described housing 1100, a coupling portion 1110 can be formed so that the drive rod 2 that is gear-coupled to the above rotor 1200 can enter.

[0159] And, the above housing 1100 may include a connector portion 1120 for electrically connecting to a circuit board (not shown) provided inside, so as to control the driving of the above rotor 1200 and stator 100.

[0160] Furthermore, the above housing 1100 may include a connector portion 1120 for electrically connecting to a circuit board (not shown) provided inside, so as to control the driving of the above rotor 1200 and stator 100.

[0161] The housing 1100 as described above may also be formed of a material with heat dissipation properties so as to be able to dissipate the heat generated during operation to the outside. As an example, the housing 1100 may be formed of a known heat-dissipating plastic material.

[0162] The rotor 1200 may include a plurality of magnets 1220 disposed around a rotor shaft 1210 having a predetermined length and be rotatably mounted in the housing 1100.

[0163] That is, the rotor 1200 may include: a rotor shaft 1210 rotatably mounted in the housing 1100; and a rotor core 1230 formed to surround the rotor shaft 1210, and the plurality of magnets 1220 may be disposed along the circumferential direction of the rotor core 1230.

[0164] As Figure 18 shown, the rotor 1200 as described above may 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.

[0165] At this time, the rotor shaft 1210 may be gear-coupled to a drive rod 2 that enters the inside of the housing 1100 through the coupling portion 1110 by means of a gear portion, and the rotor shaft 1210 may be eccentrically connected to the drive rod 2 inside the housing 1100. As an example, the gear portion may be a worm gear 3 and a worm 4.

[0166] Specifically, as Figure 19 and Figure 20 shown, the rotor shaft 1210 can be rotatably mounted at a position eccentric from the center of the housing 1100, and the drive rod 2 may be arranged in a direction consistent with the virtual central axis of the housing 1100.

[0167] In this case, as Figure 18 and Figure 20 shown, the worm gear 3 may be coupled to the end-side shaft of the rotor shaft 1210, and as Figure 20 shown, a worm 4 that is gear-coupled to the worm gear 3 may be provided on the drive rod 2 side.

[0168] Therefore, the rotor shaft 1210 and the drive rod 2 can be eccentrically connected through the worm gear 3 and the worm 4, and 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 moving direction of the drive rod 2.

[0169] The above-described stator 100 can be configured to surround the magnet 1220 of the above-described rotor 1200.

[0170] That is, the above-described 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 portion 122, and the coil 110 may be wound around the slot portion 122.

[0171] The stator 100 as described above can be applied as it is to the stator 100 for an electric motor described with reference to Figures 1 to 4 the above.

[0172] That is, as described above, the yoke 121 may have a non-circular closed-loop shape, and the slot portion 122 may be composed of at least one first slot 122a around which the coil 110 is wound and at least one coil 110 around which the coil 110 is not wound.

[0173] The specific contents of the yoke 121 and the slot portion 122 as described above are the same as the above contents, and thus detailed descriptions will be omitted.

[0174] Thus, as Figure 19 shown, the electric motor 1000 according to an embodiment of the present invention can be configured such that the rotor shaft 1210 is installed at a position offset to one side inside the housing 1100 rather than the central portion of the housing 1100. Even if the drive rod 2 is eccentrically connected to the rotor shaft 1210, the plurality of first slots 122a around which the coil 110 is wound can be configured to surround the rotor shaft 1210.

[0175] In particular, as Figure 17 and Figure 19 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 surface of the housing 1100, the space utilization rate in a limited space can be maximized.

[0176] That is, even if the rotor shaft 1210 is configured at a position offset from the center of the housing 1100 to be eccentrically connected to the drive rod 2, the length of the first slot 122a around which the coil 110 is wound is relatively longer than the length of the second slot 122b around which the coil 110 is not wound, and can be configured on both sides based on the rotor shaft 1210, thereby enabling maximum torque and maximum efficiency.

[0177] Therefore, when the rotor shaft 1210 is configured at a position offset from the center of the housing 1100 to be eccentrically connected to the drive rod 2, as Figure 21 shown, in the existing electric motor 1, the plurality of slots 122a, 122b around which the coil is wound are configured to surround only a part of the entire periphery of the rotor 20, but as Figure 19As shown, an electric motor 1000 according to an embodiment of the present invention can be configured to maximize the utilization of the space within the housing 1100 by using the above-mentioned first straight portion 121a, so that a plurality of first slots 122a of the wound coil 110 surround the entire periphery of the rotor 1200.

[0178] Accordingly, an electric motor 1000 according to an embodiment of the present invention can be configured such that even in a limited space having a specified size and shape, when the rotor shaft 1210 is eccentrically connected to the drive rod 2, the first slots 122a of the wound coil 110 can surround the entire periphery of the rotor 1200.

[0179] Therefore, while maintaining the size of the existing housing 1100, the mounting position, and the eccentric connection between the drive rod 2 and the rotor shaft 1210, the electric motor 1000 according to an embodiment of the present invention reduces the heat generated during motor operation, thereby preventing a decrease in efficiency due to heat loss.

[0180] Accordingly, an electric motor 1000 according to an embodiment of the present invention can improve efficiency compared to existing electric motors.

[0181] This can be confirmed by the results in Table 1 below.

[0182] Comparative Example 1 and Comparative Example 2 are the specifications and motor efficiency compared to the requirements configuration of the existing electric motor 1 as shown, and Example 1 and Example 2 are the specifications and motor efficiency compared to the requirements configuration of the electric motor 1000 using the stator 100 for an electric motor according to an embodiment of the present invention. Figure 21 As shown, Comparative Example 1 and Comparative Example 2 are the specifications and motor efficiency compared to the requirements configuration of the existing electric motor 1, and Example 1 and Example 2 are the specifications and motor efficiency compared to the requirements configuration of the electric motor 1000 using the stator 100 for an electric motor according to an embodiment of the present invention.

[0183] Table 1

[0184]

[0185] It can be confirmed from Table 1 above that the electric motor 1000 using the stator 100 for an electric motor according to an embodiment of the present invention can achieve a high efficiency of 8% or more while achieving the same level of torque compared to the existing ordinary electric motor 1. The above describes an embodiment of the present invention, but the idea of the present invention is not limited to the embodiments described in this specification. Those of ordinary skill in the art who understand the idea of the present invention can easily propose other embodiments by adding, changing, deleting, or adding structural elements within the scope of the same idea, and these will also fall within the scope of the idea of the present invention.

Claims

1. A stator for an electric motor, characterized in that, Comprising: At least one coil; And A stator core including a yoke in a closed-loop shape and a slot portion extending a predetermined length from the yoke, The slot portion includes at least one first slot around which the coil is wound and at least one second slot around which the coil is not wound, Wherein the yoke includes: An arc portion formed with a predetermined curvature; and A straight portion connected to an end of the arc portion, Wherein the arc portion includes a first arc portion and a second arc portion that are not connected to each other, Wherein the first arc portion and the second arc portion are formed with different lengths, Wherein the straight portion includes: A first straight portion configured to connect one end of the first arc portion and one end of the second arc portion, the first straight portion being straight; and A second straight portion including a first portion having one end connected to the other end of the first arc portion, and further including a second portion connecting the other end of the first portion and the other end of the second arc portion, and Wherein the second portion has a predetermined angle other than 0 degrees with respect to the first portion.

2. The stator for an electric motor according to claim 1, characterized in that, The first slot and the second slot extend a predetermined length inward from the yoke.

3. The stator for an electric motor according to claim 1, characterized in that, The first slot and the second slot extend a predetermined length outward from the yoke.

4. The stator for an electric motor according to claim 1, wherein The slot portion forms multiple phases, the multiple phases including a first phase and a second phase different from the first phase, The slot portion includes multiple first slots around which the coil is wound and multiple second slots around which the coil is not wound, The slots forming the first phase in the slot portion include at least one of the first slots and at least one of the second slots, The slots forming the second phase in the slot portion include at least one of the first slots and at least one of the second slots.

5. The stator for an electric motor according to claim 1, wherein The slot portion forms multiple phases, the multiple phases including a first phase and a second phase different from the first phase, The slot portion includes multiple first slots around which the coil is wound and multiple second slots around which the coil is not wound, The number of the first slots forming the first phase is the same as the number of the first slots forming the second phase.

6. The stator for an electric motor according to claim 1, wherein The slot portion forms multiple phases, the multiple phases including a first phase and a second phase different from the first phase, The slot portion includes multiple first slots around which the coil is wound and multiple second slots around which the coil is not wound, The length of the first slots forming the first phase is the same as the length of the first slots forming the second phase.

7. The stator for an electric motor according to claim 1, wherein The slot portion includes multiple first slots around which the coil is wound and multiple second slots around which the coil is not wound, The lengths of at least some of the multiple second slots are different from the length of the first slots.

8. The stator for an electric motor according to claim 1, wherein The first slot is a slot extending a predetermined length from the arc portion, The second slot is a slot extending a predetermined length from the straight portion.

9. An electric motor, characterized in that, Comprising: A housing; The rotor includes a rotor shaft rotatably mounted in the above-mentioned housing and a plurality of magnets arranged along the circumferential direction of the above-mentioned rotor shaft; And The stator is fixed to the above-mentioned housing and has coils wound in at least one slot. The above-mentioned stator is a stator for an electric motor according to any one of claims 1, 2, 3, 4, 5, 6, 7, and 8.

10. The electric motor according to claim 9, characterized in that The above-mentioned rotor shaft is gear-coupled to a drive rod that enters the interior of the above-mentioned housing by means of a gear portion, The above-mentioned drive rod is eccentrically connected to the above-mentioned rotor shaft by means of a gear portion.

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