TWI697175B - Motor stator - Google Patents

Abstract

A motor stator structure includes a core and a plurality of hairpin wires. The core has a plurality of slots, an insertion side, and an extension side. Each slot has first, second, third, fourth, fifth, and sixth layers. Each first hairpin wire has a first leg and a second leg, the first leg is inserted into the third layer of the slots, and the second leg is inserted into the sixth layer of the slots. Each second hairpin wire has a third leg and a fourth leg, the third leg is inserted into the fourth layer of the slots, and the fourth leg is inserted into the fifth layer of the slots. Each third hairpin wire has a fifth leg and a sixth leg that are inserted into the first layer and the second layer of the slots respectively. In each slot, the first leg end is connected to the immediately adjacent second leg end, the immediately adjacent third leg end, and the immediately adjacent fourth leg end to form a first winding.

Description

Motor stator

The invention relates to a motor stator, in particular to a motor stator containing hairpin-shaped wires.

On the stator used in electric motors, due to low voltage applications or high power requirements, the wire wound in its accommodating slot usually needs a sufficient cross-sectional area to withstand a large current.

A single copper wire with a larger cross section has the advantage of a higher slot ratio, but due to the skin effect and proximity effect, the AC loss of a copper wire with a large cross-sectional area will increase rapidly as the motor speed increases rise.

The present invention proposes a motor stator to solve the problems of the prior art.

In an embodiment of the invention, a motor stator includes an iron core and a plurality of first, second, and third hairpin-shaped wires. The iron core has a plurality of slots, and the iron core has an insertion side and an extension side relative to the insertion side. Each slot defines the first, second, third, fourth, fifth, and sixth layers from outside to inside in the radial direction of the iron core. Each first hairpin-shaped wire has a first leg and a second leg, the first leg is inserted into the third layer of the slots from the insertion side and protrudes from the extension side to bend in a first direction, and the second leg Insert the sixth layer of the slots from the insertion side and protrude from the extension side to bend in a second direction. Each second hairpin-shaped wire has a third leg and a fourth leg. The third leg is inserted into the fourth layer of the slots from the insertion side and protrudes from the extension side to bend in a third direction. The fourth leg Insert the fifth layer of the slots from the insertion side and protrude from the extension side to bend in a fourth direction. Each third hairpin-shaped wire has a fifth pin and a sixth pin inserted into the first and second layers of the slots, respectively. The end of the first leg of each slot is connected to the end of the immediately adjacent second leg, the end of the immediately adjacent third leg, and the end of the immediately adjacent fourth leg to form a first winding.

In an embodiment of the invention, a motor stator includes an iron core and a plurality of first, second, and third hairpin-shaped wires. The iron core has a plurality of slots, and the iron core has an insertion side and an extension side relative to the insertion side. Each slot is on the first, second, third, fourth, fifth, and sixth layers from outside to inside with respect to the radial direction of the core. Each first hairpin wire has a first leg and a second leg inserted into the third and sixth layers of the slot, respectively. Each second hairpin-shaped wire has a third pin and a fourth pin inserted into the fourth and fifth layers of the slot, respectively. Each third hairpin-shaped wire has a fifth pin and a sixth pin inserted into the first layer and the second layer of the slot, respectively. The end of the first leg of each slot is connected to the end of the immediately adjacent second leg, the end of the immediately adjacent third leg, and the end of the immediately adjacent fourth leg to form a first winding. The end of each fifth pin is connected to the end of the immediately adjacent sixth pin to form a second winding.

In summary, the present invention utilizes the aforementioned two types of hairpin-shaped wires inserted in the third to sixth layers of the slot of the iron core, the bending method and the design of the parallel connection of the windings to reduce the high-frequency operation of the motor stator winding The impedance value at the time reduces the operating energy loss during high-frequency operation and can increase the maximum spacing between adjacent wires.

In the following, the above description will be described in detail in the embodiments, and the technical solutions of the present invention will be further explained.

In order to make the description of the present invention more detailed and complete, reference may be made to the accompanying drawings and various embodiments described below. The same numbers in the drawings represent the same or similar elements. On the other hand, well-known elements and steps are not described in the embodiments to avoid unnecessary restrictions to the present invention.

Please also refer to Figures 1, 2, and 3, Figures 1 and 2 respectively show perspective views of a motor stator according to an embodiment of the present invention from two different perspectives, and Figure 3 shows a perspective view of the iron core of the motor stator. The motor stator 100 basically includes an iron core 110 and a plurality of hairpin-shaped wires (eg, hairpin-shaped wires 120, 130, 140) and the like inserted thereon. The iron core 110 has a plurality of slots 112 for inserting and connecting hairpin-shaped wires. The number of slots 112 can be 48, 60 or 120, but this case is not limited to this. The number of slots can be configured according to the design requirements of the motor stator. Within the limits of the design specifications, the configuration of most slots may form a denser wire configuration, so that the gap between the wires and the wires is closer, so the number of slots, the slot layer 2. The distance between the cross-slot of the lead wire bending and the interconnection method of the lead wire are factors that need to be considered in the design of the motor stator. The core 110 has an insertion side 110a and an extension side 110b opposite to the insertion side, that is, the insertion side 110a and the extension side 110b are opposite sides of the core 110. Each slot 112 defines a first layer 112a, a second layer 112b, a third layer 112c, a fourth layer 112d, a first layer 112a, a second layer 112b, a third layer 112c, a fourth layer 112d Five layers 112e and sixth layers 112f. The radial direction 114 of the core 110 is substantially perpendicular to the circumferential direction 115 of the core 110.

In this embodiment, the two legs of the hairpin-shaped wire 140 are inserted into the first layer 112a and the second layer 112b of the slots 112, respectively, and the hairpin-shaped wires (120, 130) are inserted into the third of the slots 112 ~ Six layers 112c to 112f. At the extension side 110b of the iron core 110, hairpin-shaped wires 140 protruding from the first and second layers 112a, 112b of the sockets 112 are connected to each other to form a winding; hairpin-shaped wires (120, 130) protrude The ends of the adjacent feet of the third to sixth layers (112c to 112f) of the slots 112 are connected to each other to form another winding, that is, the windings formed by a plurality of hairpin-shaped wires (120, 130) are connected to each other, this part It will be described in detail later.

In this embodiment, although each slot can accommodate six layers of wires as an example, this case does not limit the number of wires to accommodate each slot.

Please refer to Figs. 4, 5, and 6 at the same time. Fig. 4 is a perspective view of a hairpin-shaped wire according to an embodiment of the present invention, and Fig. 5 is a transition section U of the hairpin-shaped wire of Fig. 4 Enlarged view, Figure 6 is an enlarged view of the end of one leg of the hairpin-shaped wire of Figure 4.

The second hairpin-shaped wire (120, 130) shown in FIG. 4 is attached to the outer side of the hairpin-shaped wire 130, and is also in a state where the two hairpin-shaped wire (120, 130) is inserted into the iron core 110. Each hairpin-shaped wire 120 or 130 includes a turning section U and two legs, and the two legs are connected to both sides of the turning section U. Each leg includes an inclined section S, a vertical section V and an end section T. When each hairpin-shaped wire is inserted into the aforementioned slot of the iron core 110, the vertical section V is sunk into the slot 112 of the iron core 110, the inclined section S is exposed to the insertion side 110a of the iron core 110, and the end section T Then it protrudes from the extending side 110b of the core 110.

Referring to FIG. 5, the hairpin-shaped wire 120 has opposed surfaces 120 a and 120 b. The hairpin-shaped wire 130 has opposing surfaces 130a and 130b. The hairpin-shaped wire 120 is attached to the outside of the hairpin-shaped wire 130. In other words, the surface 120b of the hairpin-shaped wire 120 partially or completely contacts the surface 130a of the hairpin-shaped wire 130.

Each hairpin-shaped wire 120 or 130 is covered with an insulating layer. For example, as shown in FIG. 6, the hairpin-shaped wire 120 is covered with an insulating layer 120f, and the hairpin-shaped wire 130 is covered with an insulating layer 130f. The ends of the two legs of each hairpin-shaped wire are exposed from the insulating layer, thereby electrically connected to each other, for example, the ends 120e of the pins of the hairpin-shaped wire 120 are exposed from the insulating layer 120f, and the pins of the hairpin-shaped wire 130 The end 130e is exposed from the insulating layer 130f, whereby the ends (120e, 130e) of each other are soldered to form an electrical connection. Except that the ends of the two legs of each hairpin-shaped wire 120 or 130 are exposed from the insulating layer, the rest are covered with the insulating layer. Therefore, the aforementioned surfaces 120a, 120b, 130a, and 130b are all surfaces of the insulating layer, and the surface 120b The contact with the surface 130a is also the contact between the surfaces of the insulating layer.

In this embodiment (refer to FIG. 4), since the hairpin-shaped wire 120 is attached to the outer side of the hairpin-shaped wire 130, when the end surfaces 120h of the ends of the two legs of the hairpin-shaped wire 120 are respectively cut, the hairpin-shaped wire When the end face 130h of the end of the two legs of 130 is 130, the total length of the hairpin-shaped wire 120 is substantially greater than the total length of the hairpin-shaped wire 130, but this case does not limit the total length of the wire.

Referring to FIG. 5, each hairpin-shaped wire 120 and the attached hairpin-shaped wire 130 have a turning section U, and the bending angle of the hairpin-shaped wire 120 at the turning section U is different from that of the hairpin-shaped wire 130 Bending angle. Specifically, the bending angle μ of the hairpin-shaped wire 120 at the turning section U is greater than the bending angle θ of the hairpin-shaped wire 130 at the turning section U.

Please also refer to FIGS. 7A, 7B, and 7C. FIG. 7A illustrates a perspective view of a hairpin-shaped wire inserted into an iron core at an insertion side view according to an embodiment of the present invention. FIG. 7B illustrates a portion of FIG. 7A. An enlarged view of the area. FIG. 7C is a view of the hairpin-shaped wire of FIG. 7A viewed from the side where the iron core extends. In the embodiment of the present invention, the third to sixth layers 112c to 112f of the slots 112 of the iron core 110 can be used to insert a plurality of hairpin-shaped wires 120, 130. In order to clearly show the positional relationship between each hairpin-shaped wire 120, 130 and the slot 112 of the iron core 110, only one hairpin-shaped wire 120, 130 is shown. Each hairpin-shaped wire 120 is attached to the outer side of the corresponding hairpin-shaped wire 130.

Each hairpin-shaped wire 120 has two legs 120c, 120d. A leg 120c of each hairpin-shaped wire 120 is inserted into the third layer 112c of the slots 112 from the core 110 insertion side 110a and protrudes from the core 110 extension side 110b to be bent in a direction 115a by a span distance D1. The other leg 120d of each hairpin-shaped wire 120 is inserted into the sixth layer 112f of the slots 112 from the core 110 insertion side 110a and protrudes from the core 110 extension side 110b and is bent in a direction 115b by a span distance D2. The direction 115a and the direction 115b are circumferential directions 115 which are opposite to each other. The cross-groove distance D1 is the same as the cross-groove distance D2.

Each hairpin-shaped wire 130 has two legs 130c and 130d. A leg 130c of each hairpin-shaped wire 130 is inserted into the fourth layer 112d of the slots from the core 110 insertion side 110a and protrudes from the core 110 extension side 110b to be bent in a direction 115a by a span distance D1. The other leg 130d of each hairpin-shaped wire 130 is inserted into the fifth layer 112e of the slots from the core 110 insertion side 110a and protrudes from the core 110 extension side 110b toward the direction 115b for a span distance D2.

At the core 110 insertion side 110a, the surface 120a(1) of one leg 120c of each hairpin conductor 120 faces the outer side 110d of the core, and the surface 120a(2) of the other leg 120d faces the inner side of the core 110c. In other words, for each hairpin-shaped wire 120, the same surface of its two legs (120c, 120d) faces two opposite directions of the radial direction 114 on the insertion side 110a, respectively.

On the insertion side 110a of the iron core 110, the surface 130b(1) of one leg 130c of each hairpin conductor 130 faces the inner side 110c of the iron core, and the surface 130b(2) of the other foot 130d faces the outer side of the iron core 110d. In other words, for each hairpin-shaped wire 130, the same surface of its two legs (130c, 130d) faces two opposite directions of the radial direction 114 on the insertion side 110a, respectively.

Please refer to FIG. 8A, which illustrates a schematic diagram of forming a winding of each hairpin-shaped wire on the extension side 110b according to an embodiment of the present invention. For convenience of description, this embodiment only shows a few hairpin-shaped wires. As shown in the figure, the pins (120c and 130c) of each hairpin-shaped wire (120, 130) protruding from the third layer 112c and the fourth layer 112d of the slot 112 will be on their immediately adjacent feet (i.e., corresponding to the other hairpin-shaped The wires (120, 130) protrude from the sixth layer 112f and the fifth layer 112e pins (120d and 130d) of the slot 112 are connected together at the ends (for example, by soldering) to form a first winding. In other words, for the same slot 112, the feet (120c, 130c, 120d, 130d) inserted in this slot will be connected together at the end (for example, at position J1 or J2), so the last hairpin The shaped wire 120 and the hairpin shaped wire 130 are connected to each other to form a winding (as shown in FIG. 2).

Please also refer to FIG. 8B, which shows a schematic diagram of the magnetic field eddy current generated by the connection of the hairpin-shaped wire according to the present invention on the extending side of the iron core. Since the two legs (120c, 120d) of the hairpin-shaped wire 120 are inserted into the third layer 112c and the sixth layer 112f of the slot 112, respectively, the two legs (130c, 130d) of the hairpin-shaped wire 130 are inserted into the slot 112, respectively The fourth layer 112d and the fifth layer 112e are formed by the hairpin-shaped wires 120 and 130 at the junctions (such as solder joints) of the ends of the pins (120c, 130c) inserted into the third layer 112c and the fourth layer 112d The direction of the magnetic field eddy current T1 and the direction of the magnetic field eddy current T2 formed by the hairpin-shaped wires 120 and 130 at the junctions (such as welding points) of the ends (120d, 130d) of the pins (120d, 130d) inserted into the sixth layer 112f and the fifth layer 112e On the contrary, it can achieve the effect of canceling the magnetic field eddy current, thereby reducing the eddy current loss.

Returning to FIG. 8A, each hairpin-shaped wire 140 protruding from the first layer 112a of the slot 112 will have its adjacent leg 140a (ie, the corresponding other hairpin-shaped wire 140 protrudes from the second of the slot 112 The feet 140b of layer 112b) are connected together at the ends (for example at position J3 or J4), thereby forming a second winding.

Please refer to FIG. 9, which is a view of the hairpin-shaped wire of FIG. 7 from another perspective of the core extension side. Since the hairpin-shaped wire 120 is attached to the outer side of the hairpin-shaped wire 130, the surface 120a of the hairpin-shaped wire 120 on the turning section U is farther away from the core 110 than the surface 130a of the hairpin-shaped wire 130 on the turning section U The surface of the insertion side 110a.

Please refer to FIG. 10, which illustrates an enlarged view of a motor stator according to an embodiment of the present invention, with a perspective view of the iron core extending side. In one embodiment, the cross-sectional area C2 of each hairpin-shaped wire 120 is the same as the cross-sectional area C3 of each hairpin-shaped wire 130; in another embodiment, each hairpin-shaped wire 120 and each hairpin The total cross-sectional area (C2+C3) of the shaped wire 130 is less than or equal to the cross-sectional area C1 of each hairpin-shaped wire 140; in yet another embodiment, the cross-sectional area C1 of each hairpin-shaped wire 140 is greater than each The cross-sectional area C2 of the hairpin-shaped wire 120 or the cross-sectional area C3 of each hairpin-shaped wire 130, however, this case does not limit the relationship between the cross-sectional areas of various wires.

Please refer to FIG. 11, which illustrates an enlarged view of a motor stator according to an embodiment of the present invention at another angle of view of the iron core extension side. In one embodiment, the motor stator structure includes an insulating sheet 170 located between the first layer 112a and the second layer 112b of the slots, that is, the insulating sheet 170 is located on the hairpins protruding from the extension side 110b of the iron core 110 The conductor 140 is immediately adjacent to the legs (140a, 140b); in another embodiment, the motor stator structure includes an insulating sheet 180 between the fourth layer 112d and the fifth layer 112e of the slots, namely the insulating sheet 180 Between the adjacent legs (130c, 130d) of the hairpin-shaped wires 130 on the extension side 110b of the iron core 110, the insulating sheet 170 or the insulating sheet 180 improves the insulation characteristics required between the adjacent wires; in other embodiments, the motor The stator structure may not be provided with the aforementioned insulating sheet 170 or the insulating sheet 180, or may be provided with the insulating sheet 170 and the insulating sheet 180 at the same time, or only one of the insulating sheet 170 and the insulating sheet 180 may be provided.

Please refer to FIGS. 12 and 13 at the same time. FIG. 12 shows an enlarged view of a motor stator according to an embodiment of the present invention at an iron core insertion side view, and FIG. 13 shows a motor stator according to another embodiment of the present invention. Enlarged view of the side view of the core insertion. FIG. 12 shows the manner in which the hairpin-shaped wires (120, 130, 140) of the motor stator 100 are inserted into the slots of the iron core as described in the embodiments of FIGS. 1-11. The difference between the motor stator 101 and the motor stator 100 shown in FIG. 13 mainly lies in the way in which the hairpin-shaped wires (121,131) are inserted into the slots of the iron core, and the hairpin-shaped wires (121,131) are also attached to each other. However, one leg of each hairpin-shaped wire 121 is inserted into the third layer 112c of the slots 112 of the iron core, and the other leg is inserted into the fifth layer 112e of the slots 112 of the iron core, each hairpin One leg of the shaped wire 131 is inserted into the fourth layer 112d of the slots 112 of the iron core, and the other leg is inserted into the sixth layer 112f of the slots 112 of the iron core. The hairpin-shaped wire 141 is similar to the hairpin-shaped wire 140, and its two legs are inserted into the first layer 112a and the second layer 112b of the slots 112, respectively. Similarly, a plurality of hairpin-shaped wires 141 are connected to each other to form a first winding, and a plurality of hairpin-shaped wires 121 and a plurality of hairpin-shaped wires 131 are connected to each other to form a second winding. Since the hairpin-shaped wires (121, 131) of the motor stator 101 are inserted into the slots of the iron core in a manner different from the hairpin-shaped wires (120, 130) of the motor stator 100, the hairpin-shaped wires (121, 131) and There is no large-angle turning section U of the hairpin-shaped wires (120, 130). Due to the large-angle turning section U of the hairpin-shaped wires (120,130), the maximum wire spacing G1 of the hairpin-shaped wires (120,130) is greater than the maximum wire spacing G2 of the hairpin-shaped wires (121,131), there are It helps to improve the insulation reliability of the motor stator 100 as a whole.

Please refer to FIG. 14, which shows a comparison diagram of the impedances of the motor stators 100 and 101 according to two embodiments of the present invention. The curve L1 represents the change in the impedance value of the motor stator 100 when operating at a frequency of 400 Hz to 1200 Hz. The curve L2 represents the change in the impedance value of the motor stator 101 when it operates between 400 Hz and 1200 Hz. By comparing the curves L1 and L2, it can be seen that the impedance value of the motor stator 100 at high frequencies is significantly lower than the impedance value of the motor stator 101. Therefore, the operating loss of the motor stator 100 at high frequencies is lower than that of the motor stator 101. Furthermore, due to the design of the motor stator 100, the magnetic field eddy current generated by connecting the hairpin-shaped wire on the iron core extension side can be offset (as shown in FIG. 8B), so its equivalent impedance value can be effectively reduced, and Reduce the loss when the motor is running.

In summary, the present invention utilizes the aforementioned two types of hairpin-shaped wires inserted in the third to sixth layers of the slot of the iron core, the bending method and the design of the parallel connection of the windings, thereby reducing the high-frequency operation of the motor stator windings The impedance value at the time reduces the operating energy loss during high-frequency operation and can increase the maximum spacing between adjacent wires.

Although the present invention has been disclosed as above in an embodiment, it is not intended to limit the present invention. Anyone who is familiar with this skill can make various changes and modifications within the spirit and scope of the present invention, so the protection of the present invention The scope shall be deemed as defined by the scope of the attached patent application.

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the attached symbols are described as follows:

100: motor stator

101: Motor stator

110: iron core

110a: Insert side

110b: extended side

110c: inside

110d: outside

112: slot

112a: first floor

112b: Second floor

112c: Third floor

112d: Fourth floor

112e: fifth floor

112f: Sixth floor

114: radial direction

115: circumferential direction

115a: direction

115b: direction

120: Hairpin wire

121: Hairpin wire

U: turning point

120a: surface

120b: surface

120a(1): surface

120a(2): surface

120c: feet

120d: feet

120e: end

120f: insulating layer

120h: end face

130: Hairpin wire

131: Hairpin wire

130a: surface

130b: surface

130b(1): surface

130b(2): surface

130c: feet

130d: feet

130e: end

130f: insulating layer

130h: end face

140: Hairpin wire

141: Hairpin wire

170: insulating sheet

180: insulating sheet

S: inclined section

V: vertical segment

T: end segment

D1: Cross-slot distance

D2: Cross-slot distance

G1: pitch

G2: pitch

θ: angle

μ: angle

C1: Cross-sectional area

C2: Cross-sectional area

C3: Cross-sectional area

L1: Curve

L2: Curve

T1: magnetic field eddy current

T2: magnetic field eddy current

J1: location

J2: location

J3: location

J4: Location

In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious and understandable, the drawings are described as follows: FIG. 1 is a perspective view of a motor stator according to an embodiment of the present invention; FIG. 2 is a perspective view of a motor stator according to another embodiment of the present invention; FIG. 3 is a perspective view showing an iron core of a motor stator according to an embodiment of the invention; FIG. 4 is a perspective view of a hairpin-shaped wire according to an embodiment of the invention; Figure 5 is an enlarged view of the turning section of the hairpin conductor of Figure 4; Figure 6 is an enlarged view of the end of one leg of the hairpin-shaped wire of Figure 4; FIG. 7A is a perspective view of a hairpin-shaped wire inserted into an iron core according to an embodiment of the present invention at an insertion side perspective; Figure 7B is an enlarged view of a part of the area of Figure 7A; Figure 7C is a view of the hairpin-shaped wire of Figure 7A viewed from the side of the core extension; FIG. 8A is a schematic diagram showing that each hairpin-shaped wire forms a winding on the extension side according to an embodiment of the invention; FIG. 8B is a schematic diagram showing that the magnetic field eddy current generated by the hairpin-shaped wire connected to the iron core extension side is offset; FIG. 9 is a view from another perspective of the hairpin wire of FIG. 7; FIG. 10 is an enlarged view of a motor stator according to an embodiment of the present invention viewed from the side of the iron core extension; FIG. 11 is an enlarged view of another perspective of a motor stator according to an embodiment of the present invention on the side where the iron core extends; FIG. 12 is an enlarged view of a side view of a motor stator inserted into an iron core according to an embodiment of the invention; FIG. 13 is an enlarged view of a side view of a motor stator inserted into an iron core according to another embodiment of the present invention; and FIG. 14 shows a comparison diagram of the impedance of a motor stator according to two embodiments of the present invention during operation.

110a: Insert side

112c: Third floor

112d: Fourth floor

112e: fifth floor

112f: Sixth floor

120: Hairpin wire

120a(1): surface

120a(2): surface

120c: feet

120d: feet

130: Hairpin wire

130b(1): surface

130b(2): surface

130c: feet

130d: feet

Claims (20)

A motor stator, including: An iron core with a plurality of slots, the iron core has an insertion side and an extension side relative to the insertion side, wherein each of the slots is defined from outside to inside with respect to the radial direction of the iron core The first, second, third, fourth, fifth and sixth floor; A plurality of first hairpin-shaped wires, each of the first hairpin-shaped wires has a first leg and a second leg, the first leg is inserted from the insertion side into the third layer of the slots and from the The extension side protrudes and bends in a first direction, and the second leg is inserted into the sixth layer of the slots from the insertion side and protrudes from the extension side and bends in a second direction; A plurality of second hairpin-shaped wires, each of the second hairpin-shaped wires has a third pin and a fourth pin, the third pin is inserted into the fourth layer of the slots from the insertion side and from the The extension side protrudes and bends in a third direction, and the fourth leg is inserted into the fifth layer of the slots from the insertion side and protrudes from the extension side and bends in a fourth direction; and A plurality of third hairpin-shaped wires, each of the third hairpin-shaped wires has a fifth pin and a sixth pin inserted into the first layer and the second layer of the slots, respectively; The first pin of each of the slots is connected to the second pin, the third pin, and the fourth pin to form a first winding. The motor stator as described in item 1 of the patent application, wherein the first direction and the third direction are the same circumferential direction, the second direction and the fourth direction are the same circumferential direction, and the first direction is This second direction is the opposite circumferential direction. The motor stator as described in item 1 of the patent scope, wherein each of the first hairpin-shaped wires and each of the second hairpin-shaped wires has a turning section on the insertion side of the iron core, The bending angle of the first hairpin-shaped wires at the turning section is different from the bending angle of the second hairpin-shaped wires. The motor stator as described in item 1 of the patent application scope, wherein each of the first hairpin-shaped wires has a first surface and a second surface opposite to each other, and each of the second hairpin-shaped wires has an opposite A third surface and a fourth surface, the second surface contacts the third surface. The motor stator as described in item 4 of the patent application scope, wherein each of the first hairpin-shaped wires and each of the second hairpin-shaped wires have a turning section on the insertion side of the iron core, the The surface of the first surface at the turning section is farther away from the insertion side of the core than the third surface at the turning section. The motor stator as described in item 4 of the patent application range, wherein the first surface of the first leg faces the outside of the iron core on the insertion side, and the first surface of the second leg is on the insertion side It faces the inside of one of the iron cores. The motor stator as described in item 4 of the patent application range, wherein the fourth surface of the third leg faces the inner side of the iron core on the insertion side, and the fourth surface of the fourth leg is on the insertion side It faces the outside of one of the cores. The motor stator as described in item 1 of the patent scope, wherein the cross-sectional area of each of the third hairpin-shaped wires is greater than that of each of the first hairpin-shaped wires or each of the second hairpin-shaped wires Cross-sectional area. The motor stator as described in item 1 of the patent application scope further includes an insulating sheet located on the fifth and sixth legs protruding from the extended side of the first layer and the second layer of the slots between. The motor stator as described in item 1 of the patent application scope, wherein each fifth leg is connected to the immediately adjacent sixth leg to form a second winding. The motor stator as described in item 1 of the patent application scope further includes an insulating sheet located on the third and fourth legs protruding from the extended side of the fourth and fifth layers of the slots between. The motor stator as described in item 1 of the patent scope, wherein the first leg protrudes from the extension side and bends a first span slot distance, and the second leg protrudes from the extension side and bends a second span The groove distance, the first cross-groove distance and the second cross-groove distance are the same. The motor stator as described in item 1 of the patent application scope, wherein the total length of each of the first hairpin-shaped wires is greater than the total length of each of the second hairpin-shaped wires. The motor stator as described in item 1 of the patent application scope, wherein the cross-sectional area of each of the first hairpin-shaped wires is the same as the cross-sectional area of each of the second hairpin-shaped wires. The motor stator as described in item 1 of the patent application, wherein the sum of the cross-sectional areas of each of the first hairpin-shaped wires and each of the second hairpin-shaped wires is less than or equal to each of the third The cross-sectional area of the hairpin conductor. A motor stator, including: An iron core with a plurality of slots, the iron core has an insertion side and an extension side relative to the insertion side, wherein each of the slots is defined from outside to inside with respect to the radial direction of the iron core The first, second, third, fourth, fifth and sixth floor; A plurality of first hairpin-shaped wires, each of the first hairpin-shaped wires has a first leg and a second leg inserted into the third layer and the sixth layer of the slots, respectively; A plurality of second hairpin-shaped wires, each of the second hairpin-shaped wires has a third pin and a fourth pin inserted into the fourth and fifth layers of the slots, respectively; and A plurality of third hairpin-shaped wires, each of the third hairpin-shaped wires has a fifth pin and a sixth pin inserted into the first layer and the second layer of the slots, respectively; The first pin of each of the slots is connected to the immediately adjacent second pin, the immediately adjacent third pin and the immediately adjacent fourth pin to form a first winding, and each of the fifth pins is adjacent to the The sixth pin is connected to form a second winding. The motor stator as described in claim 16 of the patent application, wherein each of the first hairpin-shaped wires has a first surface and a second surface opposite to each other, the first leg, the first surface and the second leg The first surface of the is respectively facing the opposite direction in the radial direction on the insertion side. The motor stator as described in item 17 of the patent application scope, wherein each of the second hairpin-shaped wires has a third surface and a fourth surface opposite to each other, the fourth surface of the third leg and the fourth The fourth surface of the foot respectively faces the opposite direction in the radial direction on the insertion side, wherein the second surface contacts the third surface. The motor stator as described in item 16 of the patent application scope further includes a first insulating sheet located on the third leg and the third leg protruding from the extended side of the fourth layer and the fifth layer of the slots Between the four legs, and/or a second insulating sheet is located between the fifth pins and the sixth pins protruding from the extended side of the first layer and the second layer of the sockets. The motor stator as described in item 16 of the patent application scope, wherein the cross-sectional area of each of the first hairpin-shaped wires is the same as the cross-sectional area of each of the second hairpin-shaped wires, and/or each of these The total cross-sectional area of the first hairpin-shaped wire and each of the second hairpin-shaped wires is less than or equal to the cross-sectional area of each of the third hairpin-shaped wires.

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