JP2009235582A - Motor copper wire protecting sleeve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor copper line protecting sleeve which can maintain a cylindrical shape, easily insert a copper wire even without using a tool, has a smooth inside of sleeve and the tip of copper line not to be caught, has conformability after copper wire insertion, proper stretchability and easily carries out operation for adjusting a sleeve covering range. <P>SOLUTION: The motor copper wire protecting sleeve uses a multifilament having a single filament fineness of ≥19 dtex and ≤88 dtex and the number of filaments of ≥4 and ≤30. A plurality of the multifilaments are arranged in parallel and cylindrically subjected to circular braiding to give the motor copper wire protecting sleeve. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a copper wire protective sleeve for a motor that covers and protects the outside of a copper wire such as a motor coil.

Conventionally, for example, in a stator core 100 of a motor as shown in FIG. 4, as a member for binding copper wires of a coil 101 disposed on a slot 102 and a wedge 103, a binding string H made of a multifilament is used. Has been proposed.
JP-A-8-13300

  For example, in the above-mentioned Patent Document 1, two multifilaments of polyethylene naphthalate (PEN) are aligned and assembled into a square punched structure by using a string making machine, and sodium alkylbenzene sulfonate is used as a cleaning agent for oil. A motor binding string scoured at 60 ° C. for 20 minutes is disclosed. Examples of Patent Document 1 include multifilaments having a total fineness of 250 denier and 48 filaments (single yarn fineness of 5 to 6 denier), and a total fineness of 1000 denier and 192 filaments (single yarn). It is described that the fineness is 5 to 6 denier.

  On the other hand, in general, since a three-phase current signal consisting of a U phase, a V phase, and a W phase flows through the copper wire of the motor coil, for example, as shown in FIG. 4, the copper wire is covered and protected. At the same time, a protective sleeve S20 that functions as a copper wire separator for each phase is required. Therefore, conventionally, as an example of such a protective sleeve, a protective sleeve made of multifilaments having a single yarn fineness of about 5 to 6 deniers as disclosed in Patent Document 1 may be used. The unit “denier” of the yarn thickness used in Patent Document 1 is expressed by the mass (gram) of the yarn per 9000 m. In the following description, the yarn per 10,000 m The description will be made in a unified manner by “dtex (decitex)” which is a unit of the thickness of the yarn expressed by the mass (number of grams).

  However, the conventional protective sleeve composed of multifilaments having a single yarn fineness of about 1 to 8 dtex has the following problems.

  First, for example, when the protective sleeve is composed of multi-filaments of meta-aramid fibers having a single yarn fineness of 2 dtex, a filament count of 100, and a total fineness of 200 dtex, the single yarn diameter is thin and the total fineness is insufficient. As shown in FIG. 18, the opening 11 of the protective sleeve S10 has a flat shape in a normal state, and a copper wire is applied to the protective sleeve S10 in the motor manufacturing process. There was a problem that it took time to insert. For this reason, the conventional protective sleeve S10 as shown in FIG. 18, for example, becomes difficult to insert the copper wire of the coil unless a cap-shaped jig is used.

  Therefore, for example, two multifilament yarns of polyethylene naphthalate (PEN) having a single yarn fineness of 8 dtex, a filament count of 108, and a total fineness of 890 dtex are aligned to form a cylindrical sleeve of 48 beats or more. Configuration was also considered. That is, even in the case of a multifilament with a single yarn diameter in the range of 1 to 8 dtex, if the number of filaments is increased to make the total fineness sufficiently thick, the sleeve shape approaches a cylindrical shape. Since it was considered possible to improve the insertion of the copper wire in the opening, several prototypes were produced. However, for example, when a multi-filament yarn having a total fineness of 890 dtex is aligned to form a protective sleeve of 48 beats or more, the total amount of fibers used is 890 dtex × 2 × 48 = 85440 dtex. There was a problem that the cost was unavoidably increased. Therefore, the idea of making the sleeve shape cylindrical by increasing the total fineness has been difficult to adopt as a practical product.

On the other hand, conventionally, for example, it has also been proposed to manufacture a protective sleeve using polyphenylene sulfide fiber (PPS) monofilament.
JP 2001-123324 A

  However, since the protective sleeve made of monofilament as disclosed in Patent Document 2 lacks flexibility, there is a problem that it is not suitable as a copper wire protective sleeve for motors. In particular, the copper wire of the coil through which three-phase current signals of U-phase, V-phase, and W-phase have different ranges that must be covered by the sleeve, and after inserting the copper wire, the work of turning back the end of the sleeve However, since the conventional protective sleeve made of monofilament lacks flexibility, there is a problem in that a crack may occur at the folded position, causing electric leakage from that position, resulting in insulation failure. In addition, a protective sleeve made of monofilament has a coarse structure and a large gap due to a large single yarn diameter when knitted into a sleeve, resulting in poor insulation performance even in normal conditions, There was also a problem that there was a high risk of being. Further, the protective sleeve made of monofilament has a problem that it is inferior in high temperature oil resistance.

Therefore, conventionally, in order to solve the above-mentioned problems, a multifilament and mofilin are mixed as a protective sleeve that can insert a copper wire without using a jig and is excellent in high temperature oil resistance. A protective sleeve of the configuration has been proposed.
JP 2004-176243 A

  The protective sleeve of Patent Document 3 is a mixture of synthetic filament multifilaments having a melting point or decomposition temperature of 280 ° C. or higher and monofilaments, which are made into a braided string of 24 or more cylindrical shapes. As the multifilament, those having a total fineness of 440 dtex and 100 filaments (single yarn fineness of 4 to 5 dtex) and those having a total fineness of 220 dtex and 100 filaments (single yarn fineness of 2 to 3 dtex) The use is described. A monofilament having a diameter of 0.25 mm is used.

  However, the protective sleeve of Patent Document 3 also has problems as described below.

  First, since the protective sleeve of Patent Document 3 is made by mixing multifilaments having a small diameter so as to fill a gap between thick monofilaments having a diameter of about 0.25 mm, for example, as shown in FIG. The irregularities peculiar to monofilaments are recognized on the surface 22 and the inner surface 23 of the sleeve. In addition, the protective sleeve S20 of Patent Document 3 has the disadvantage that the multifilament single yarn fineness is as thin as 2 to 5 dtex, so that the durability against abrasion and abrasion due to abrasion is poor, and the fluff is likely to fluff.

  Therefore, in the protective sleeve S20 of Patent Document 3, although the shape of the distal end portion 21 of the sleeve is maintained in a round shape, the copper wire insertion property at the distal end portion 21 is improved, but the copper wire is used as the sleeve. In the process of inserting into the back of the wire, the tip of the copper wire gets caught on the irregularities peculiar to monofilaments, and the single yarn fineness gets caught on the fluffy parts peculiar to thin multifilaments of 2 to 5 dtex. However, there is a problem that there is a possibility that the tip of the copper wire protrudes to the outside of the sleeve.

  Further, since the protective sleeve S20 of Patent Document 3 uses a mixture of monofilament and multifilament, the sleeve has a high elastic force with a compression elastic modulus in the range of 67 to 93%. 20A shows a state in which the protective sleeve S20 of Patent Document 3 is pressed between the thumb and forefinger, and FIG. 20B shows a state in which the finger is released from the state in FIG. However, as shown in FIG. 20, the conventional protective sleeve S20 has a strong resilience that immediately restores the original shape when the finger is released from the pressed state.

  By the way, in general, the motor is required to be downsized, and the width dimension is designed based on the position of the binding string H in FIG. However, since the protective sleeve of Patent Document 3 is strong in resilience, the periphery of the portion pressed by the binding string is swollen and bulky, and the position around the binding string H is larger than the position of the binding string H, which is unexpected. The size was taken up, and it was a factor preventing the motor from being made compact. That is, in the copper wire protective sleeve for motors, it is desirable that the cylindrical shape is maintained before insertion of the copper wire and it is excellent in insertability, but after binding with the binding string after insertion of the copper wire, Where it is desirable that the conformability is high and the shape is not restored, the protective sleeve of Patent Document 3 has a problem that the conformity is low, and therefore, the protective sleeve swells and becomes bulky when bound with a binding string.

  FIG. 21 shows (a) a length L21 in a normal state, (b) a length L22 in a state of being pulled in the left-right direction, and a length L23 in a state of being pushed in the center direction. However, as shown in FIG. 21, the protective sleeve of Patent Document 3 has a problem that adjustment work at the time of inserting the copper wire is troublesome because of its large stretchability. That is, the copper wire of the motor has a range that must be covered with a protective sleeve and a range that does not need to be covered. From the viewpoint of cost reduction, the protective sleeve may be omitted in a range that does not need to be covered. In that case, when inserting the copper wire, the protective sleeve is manually moved back and forth to adjust the range covered with the sleeve, but the protective sleeve of Patent Document 3 is highly stretchable as shown in FIG. For this reason, the change in length between the fully extended state and the contracted state of the sleeve is too large, and there is a problem that adjustment work is troublesome.

  Further, since the protective sleeve of Patent Document 3 is formed by mixing multifilaments and monofilaments having different stiffnesses, when braiding, it is necessary to attach a weight with a different weight to the bobbin to maintain tension. There was also the disadvantage of becoming complicated. Furthermore, the fluff peculiar to multifilaments having a single yarn fineness of 2 to 5 dtex may cause electric leakage.

  The present invention has been made to solve the above-described conventional problems, and is based on the assumption that a cylindrical shape is maintained and a copper wire can be easily inserted without using a jig. In addition, the inner surface of the sleeve is smooth, does not catch the tip of the copper wire, and is compatible after insertion of the copper wire, so that it does not become bulky when tied with a tying string, and it expands and contracts The purpose of the present invention is to provide a copper wire protective sleeve for a motor that is moderate in performance and can easily adjust the area covered by the sleeve.

In order to achieve the above object, the copper wire protective sleeve for a motor of the present invention comprises:
The main feature is that a plurality of multifilaments having a single yarn fineness in the range of 19 dtex or more and 88 dtex or less and a number of filaments in the range of 4 or more and 30 or less are aligned and round-knitted in a cylindrical shape.

  Since the protective sleeve of the present invention is composed of a thick multifilament having a single yarn fineness in the range of 19 dtex or more and 88 dtex or less, a cylindrical shape capable of inserting a copper wire without using a jig is maintained. In addition, no fuzz peculiar to multifilaments with fine single yarn fineness is observed. Moreover, since it is not mixed with a monofilament but formed only of multifilaments, the surface inside the sleeve is smooth, and the tip of the copper wire is not caught in the process of advancing the insertion of the copper wire. In addition, since the compression recovery rate is low and the conformability is high, the periphery of the binding string does not swell when binding with the binding string, and the fit is good. Further, since the stretchability is also appropriate, the range covered with the sleeve can be easily adjusted manually.

  The copper wire protective sleeve for motors of the present invention has a single yarn fineness in the range of 19 dtex or more and 88 dtex or less, and a plurality of multifilaments in the range of 4 or more and 30 or less filaments are aligned and rounded into a cylindrical shape. Braided.

  As a result of repeated studies, the inventor has found that it is important to use a multifilament having a large single yarn fineness in order to solve the above-described problems, specifies the conditions, and completes the present invention. It was. That is, if the single yarn fineness is within the range of 19 dtex or more and 88 dtex or less, and the number of filaments is 4 or more and 30 or less, the sleeve has a round cross section, so that there is no need to use a special jig. In addition to being able to insert a copper wire, it is possible to avoid fuzzing peculiar to multifilaments having a fine single yarn fineness. In addition, because it is composed of only multifilaments and there is no irregularities peculiar to monofilaments, the surface inside the sleeve is smooth, so the tip does not get caught when inserting the copper wire, and the copper wire is smooth to the end Can be inserted. Further, even when binding with a binding string, the compression recovery rate is low and the conformability is high as compared with the conventional protective sleeve of Patent Document 3, so that it does not become bulky. In addition, since the stretchability is moderately low, it is easy to adjust the position covered by the sleeve.

  The reason why the number of filaments is in the range of 4 to 30 is that when the number of filaments is 3 or less, the productivity is lowered and it is difficult to manufacture the protective sleeve industrially at low cost, This is because the discharge amount of the polymer per die during spinning is reduced, so that the melt residence time becomes long, and there is a possibility of inducing yarn breakage in the yarn making process due to thermal deterioration. Further, when the number of filaments is 31 or more, entangled portions are generated during running of the yarn due to the friction between the yarns, and there is a risk of inducing uneven drawing between the single fibers and uneven heat treatment. In view of the uniformity of physical properties and industrially stable production, the number of filaments is more preferably 10-20.

  The protective sleeve of the present invention has a single yarn fineness in the range of 19 dtex or more and 88 dtex or less and a number of filaments in the range of 4 or more and 30 or less. The combination of the single yarn fineness and the number of filaments is within the above range. , Each can be determined freely. Within the above range, the sleeve has a round cross section, and the inside of the sleeve is smooth so that a copper wire can be inserted smoothly, and the sleeve has high conformability and moderately low stretchability. can get.

  However, the protective sleeve of the present invention is more preferably configured so that the compression recovery rate is 37% or less in the compression recovery rate test. This is because, if the compression recovery rate is further set to 37% or less under the above conditions, the conformability when binding to the motor after insertion of the copper wire becomes optimal.

  The material of the multifilament used in the protective sleeve of the present invention is not particularly limited. For example, when applied to a protective sleeve for a motor of a hybrid vehicle, since high temperature oil resistance is required, polyphenylene sulfide fiber or aramid fiber is used. It is desirable to use it. Polyphenylene sulfide fiber is known to cause almost no problems when used at high temperatures because it has excellent heat resistance and hydrolysis resistance. Also, it has the excellent characteristics of chemical resistance as that of fluororesin. Since it has, it is suitable.

  The protective sleeve of the present invention is obtained by aligning a plurality of multifilaments having the above conditions and round-knitting them into a cylindrical shape. The number to be aligned may be appropriately determined according to the type of motor to be applied and the required performance, and is not particularly limited. For example, when applied to a protective sleeve for a motor of a hybrid vehicle, a sleeve with moderate hardness can be obtained by aligning two or three multifilaments with the above conditions and round-knitting.

  In general, the number of carriers of a machine for carrying out round braiding is 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 64, 96, etc. In the present invention, the required protective sleeve What is necessary is just to select according to the thickness of a diameter, and the number of carriers is not specifically limited. For example, when applied to a protective sleeve for a motor of a hybrid vehicle, a carrier number of 32 or more is usually selected and a protective sleeve having a diameter of 5 mm or more is braided. There are two types of round braids, one is braided into the core and the other is braided into a cylindrical shape. In the present invention, a method of braiding into a cylindrical shape is used.

  The present invention exhibits a particularly advantageous effect when it is necessary to increase the diameter of the protective sleeve (specifically, when the number of carriers is 20 or more). This is because, in general, even in the case of multifilaments, if the number of carriers is 12 to 16 and the diameter of the protective sleeve is small, the shape of the sleeve is likely to be cylindrical, but if the number of carriers is 20 or more, the cylinder This is because it becomes difficult to braid the protective sleeve in the shape. Accordingly, the present invention is particularly suitable for a protective sleeve for a motor of a hybrid vehicle in which, for example, a carrier number of 32 or more is usually selected and a protective sleeve having a diameter of 5 mm or more is used.

  Further, it is more desirable that after the round braiding is further processed so as to be continuously pushed up with a rod-shaped jig to become a cylindrical shape. By doing so, the cylindrical shape appears clearly, so that the insertability of the copper wire at the end of the sleeve is further improved. Such processing is performed, for example, immediately after the protective sleeve is assembled by a string making machine using a thread wound on a small bobbin, and immediately below it, the tip of the iron is rounded corresponding to the inner diameter of the string. This can be done by pushing up a round bar.

  In the present invention, the total fineness of the multifilament used is not particularly limited. However, if the total fineness is increased more than necessary, the cost increases. Therefore, considering the avoidance of cost increase, it is desirable that the total fineness of the multifilament used in the present invention is 440 dtex or less. For example, when the total fineness is set to 440 dtex, when the two are aligned and made into a braid of 48 punches, the entire protective sleeve is 440 dtex × 2 × 48 = 42240 dtex. Can be reduced.

  Further, the inner diameter of the copper wire protective sleeve for a motor of the present invention is not particularly limited because the optimum value varies depending on the type and size of the motor to be applied. For example, when applied to a protective sleeve for a motor of a hybrid vehicle, it can be configured as a cylindrical sleeve having an inner diameter of 7 to 8 mm. For example, when applied to a protective sleeve for a motor of a home appliance, it can be configured as a cylindrical sleeve having an inner diameter of 5 to 7 mm.

  Hereinafter, based on an Example and a comparative example, this invention is demonstrated further more concretely. First, the strength (N) and elongation (%) of the protective sleeve, surface properties (mean coefficient of friction (MIU), coefficient of friction variation (MMD)), compression recovery rate (%), compression load (N), repeated compression A method for measuring the displacement (mm) at 0.1 N in will be described.

1) Strength (N) and elongation (%)
It calculated | required by the method based on the JISL1013 method. Using a tensile constant speed extension type tester, the average value of three measurements was obtained with a gripping interval of 200 mm and a tensile speed of 200 mm / min. The elongation was tested in two ways: 10N load and 20N load.

2) Surface characteristics (mean coefficient of friction (MIU), coefficient of friction variation (MMD))
This is a contact made by arranging 10 pieces of piano wire of 0.5mm diameter on the surface of the fabric of width 0.5cm and length 2cm. The tension is 400g, friction. The surface characteristics were measured by scanning under conditions of a static load of 50 gf and a roughness static load of 10 gf. The average coefficient of friction (MIU) is an index for viewing slipperiness, and the smaller this value, the easier the surface of the fabric slips. Friction coefficient variation (MMD) is an index of smoothness and represents the average deviation of the friction coefficient. The smaller this value, the smoother the surface of the fabric (the smaller the variation of the protective sleeve assembly). ).

3) Compression recovery rate (%)
The protective sleeve was fixed, and a compression tester applied a compressive force at a low speed of 0.1 cm / sec on a circular plane of 2 cm 2 and measured the characteristics of the sleeve when a force of 1 KN was applied. The compression tester can graph the compression characteristics until reaching 1 KN and the compression characteristics when reaching and returning to 1 KN. In the following tests, the compression resilience (RC) value is taken as the compression recovery rate (%). The compression recovery rate (%) indicates that the closer to 100, the stronger the recovery rate of the protective sleeve and the lower the conformability.

4) Compression load (N)
The remaining 3 mm compressive load (N) was measured with a universal tensile tester (constant speed extension type tensile tester) using a compression test jig having a pressure surface diameter of 50 mm. Specifically, the initial pressure plate distance (before applying a load) was set to the diameter of the sample + 1 mm, and the load (N) when compressed until the pressure plate distance became 3 mm at a speed of 10 mm / min was measured. Then, compression was performed at three positions at positions where the influences at both ends of the sample were eliminated, and an average value was calculated.

5) Displacement at 0.1 N in repeated compression (mm)
Using a universal tensile tester (constant-speed extension type tensile tester), the displacement (mm) at 0.1 N in repeated compression was measured using a compression test jig having a pressure surface diameter of 50 mm. Specifically, the initial pressure plate distance (before applying a load) is set to the diameter of the sample + 1 mm, and compression is performed at a speed of 10 mm / min until the pressure plate distance becomes 1 mm. The compression position is the center of the sample. And compression was repeated 5 times and the difference of the 1st to the 5th compression and the 1st time was calculated about the displacement (mm) at the time of 0.1N, respectively.

  Next, the following protective sleeve was prepared. Example 1, Example 1-2, and Example 2 are examples of the protective sleeve of the present invention. Comparative Example 2-2, Comparative Example 3, Comparative Example 3-2, and Comparative Example 4 are examples of conventional protective sleeves.

Example 1
48 yarns of multi-filament (single yarn fineness: 36 dtex, total fineness: 440 dtex, 12 filaments) of polyamide fiber (manufactured by Kuraray, melting point = 265 ° C.) were aligned and wound on a small bobbin.

  This was set in a round punching braided 48-placing machine, tied into a braid, and immediately after that, it was continuously pushed up and pushed up by a component called a push-up device, and assembled into a cylindrical shape. As shown in FIG. 1, the obtained protective sleeve S had a circular shape with the tip portion 1 having a circular shape in a normal state, and a cylindrical shape having a sleeve inner diameter of about 7 mm was maintained. Further, the protective sleeve S had no irregularities on the surface 2 of the sleeve and the surface of the sleeve interior 3, and no fuzz was observed at all.

  2A shows a state where the protective sleeve S of Example 1 is pressed between the thumb and the index finger, and FIG. 2B shows a state where the finger is released from the state of FIG. 2A. is there. As shown in FIG. 2, the protective sleeve S of Example 1 has a shape of the pressed portion that remains even when the finger is released from the pressed state, and has a low resilience and a high conformability. confirmed.

  3 shows (a) the length L1 in the normal state, (b) the length L2 in the state pulled in the left-right direction, and the length L3 in the state pushed in the center direction. However, as shown in FIG. 3, the protective sleeve of Example 1 is less stretchable than the protective sleeve of Patent Document 3. The copper wire of the motor has a range that must be covered with a protective sleeve and a range that does not need to be covered. From the viewpoint of cost reduction, the protective sleeve may be omitted in the range that does not need to be covered. As shown in FIG. 31, the protective sleeve No. 1 has moderate elasticity, and it was confirmed that it was easy to adjust the range covered by the protective sleeve.

  Moreover, since the protective sleeve S of the embodiment cut into a length of about 10 to 40 cm has a round cross section, it is easy to make the copper wire of the motor coil without requiring a special jig. I was able to insert it. After that, when the protective sleeve into which the coil is inserted is bound with the binding string, the sleeve S is highly compatible, so that the area around the portion pressed by the binding string does not swell and become bulky. The dimensions could be designed.

(Example 1-2)
A braided sleeve having an inner diameter of about 8 mm under the same conditions as in Example 1 was designated as Example 1-2. The obtained protective sleeve was maintained in a cylindrical shape in a normal state as in Example 1. Further, the surface characteristics, conformability and stretchability were the same as in Example 1.

(Example 2)
48 yarns of polyphenylene sulfide fibers (manufactured by Kuraray Co., Ltd., melting point = 285 ° C.) (single fineness: 28 dtex, total fineness: 340 dtex, 12 filaments) were drawn and wound on a small bobbin.

  This was set in a round punching braided 48-placing machine, tied into a braid, and immediately after that, it was continuously pushed up and pushed up by a component called a push-up device, and assembled into a cylindrical shape. As in Example 1, the obtained protective sleeve had a circular tip shape in a normal state, and a cylindrical shape having a sleeve inner diameter of about 7 mm was maintained. Further, the surface characteristics, conformability and stretchability were the same as in Example 1.

(Comparative Example 1)
Three multi-filament yarns (single yarn fineness: 2 dtex, total fineness: 220 dtex, 100 filaments, 430 type) of meta-aramid fibers (manufactured by DuPont "NOMEX (trade name), melting point or decomposition temperature = 371 ° C)" 64 were prepared by winding them around a small bobbin.

  This was set in a round-tissue 64-strike machine, tied into a braid, and immediately after that, it was continuously pushed up or pushed up by a component called a push-up device, and assembled into a cylindrical shape. The resulting protective sleeve is composed of multifilaments having a single filament fineness of 2 dtex, so that the sleeve itself is extremely soft, flattened in a tape shape, flattened, and in a normal state, a cylindrical shape The shape could not be maintained. Therefore, in the motor manufacturing process, it is difficult to insert a copper wire unless a cap-shaped jig is used.

(Comparative Example 2)
Two multifilaments (single yarn fineness: 8 dtex, total fineness: 890 dtex, 108 filaments, Q904M type) of polyethylene naphthalate fiber (“Teonex” manufactured by Teijin Fibers (trade name), melting point or decomposition temperature = 272 ° C.) 48 were prepared by winding them on small bobbins.

  This was set on a 48-strand string-making machine with a round structure, and it was formed into a braid. Immediately after that, it was continuously pushed up or pushed up by a component called a push-up device, and assembled into a cylindrical shape. The obtained protective sleeve was kept cylindrical in a normal state. However, since the multi-filaments having a total fineness of 890 dtex are aligned and set to 48 beats, the entire protective sleeve uses too much fiber, resulting in an increase in cost.

(Comparative Example 2-2)
A braided sleeve having an inner diameter of about 8 mm under the same conditions as in comparative example 2 was designated as comparative example 2-2.

(Comparative Example 3)
48 monofilaments (diameter = 150 μm) of PPS fibers (manufactured by Kureha Gosei Co., Ltd., melting point or decomposition temperature = 285 ° C.) were aligned and wound on a small bobbin to prepare 48 monofilaments.

  This was set on a 48-strand string-making machine with a round structure, and it was formed into a braid. Immediately after that, it was continuously pushed up or pushed up by a component called a push-up device, and assembled into a cylindrical shape. Since the obtained protective sleeve was composed of a monofilament having a diameter of 150 μm, a cylindrical shape having an inner diameter of about 6.5 mm was maintained, but there was a problem of lack of flexibility. For this reason, it has been found that if the end of the sleeve is turned back after inserting the copper wire, a crack may occur at that position, resulting in an insulation failure.

(Comparative Example 3-2)
A braided sleeve having an inner diameter of about 8 mm under the same conditions as in Comparative Example 3 was designated as Comparative Example 3-2.

(Comparative Example 4)
Two multifilament yarns (single yarn fineness: 4 dtex, total fineness: 440 dtex, 100 filaments, 190 type) of PPS fibers (Toray “Torucon” (trade name), melting point or decomposition temperature = 285 ° C.) are aligned. 28 were prepared by winding them on a small bobbin.

  Separately, 28 monofilament yarns (diameter = 0.25 mm) of PPS fibers (manufactured by Toray Monofilament, melting point or decomposition temperature = 280 ° C.) were wound around a small bobbin to prepare 28 pieces.

  These were alternately placed on a 56-strand string-making machine with a round structure, and the braided string was formed. Immediately after that, it was continuously pushed up or pushed up by a component called a pushing-up device, and assembled into a cylindrical shape. The obtained protective sleeve is equivalent to the protective sleeve disclosed in Patent Document 3, has a strong resilience, and has a cylindrical shape with an inner diameter of about 6.5 mm in a normal state. No problem was found in terms of copper wire insertion.

  However, since the protective sleeve of Comparative Example 4 is formed by mixing multifilaments so as to fill the gaps of the monofilament having a diameter of 0.25 mm, irregularities peculiar to monofilaments were recognized on the surface of the sleeve. . Further, the protective sleeve of Comparative Example 4 had poor durability against friction and abrasion due to abrasion due to the single filament fineness of the multifilament being as thin as 2 dtex, and fluff was observed.

  Therefore, in the protective sleeve of Comparative Example 4, in the process of inserting the copper wire into the back of the sleeve, the tip of the copper wire is caught on the uneven portion peculiar to the monofilament, or is caught on the fuzzy portion peculiar to the multifilament, There was a problem that it could not be inserted smoothly or the tip of the copper wire protruded outside the sleeve.

  In addition, since the protective sleeve of Comparative Example 4 was mixed with monofilaments, there was a problem that the sleeve had high resilience and low conformability. For this reason, when the copper wire is inserted and fixed to the motor with the cable tie, the area around the portion pressed by the cable tie swells and becomes a factor that hinders the miniaturization of the motor.

  In addition, since the protective sleeve of Comparative Example 4 is highly stretchable, the length change between the extended state and the contracted state of the sleeve when the copper wire is inserted is too large. The problem that adjustment becomes difficult was also recognized.

Next, Example 1, Example 1-2, Example 2, Comparative Example 1, and Comparative Example 2 manufactured as described above were prepared. Using the protective sleeves of Comparative Example 2-2, Comparative Example 3, Comparative Example 3-2, and Comparative Example 4 in the test method as described above, the strength (N) and elongation (%), surface characteristics of the protective sleeve (Average friction coefficient (MIU), friction coefficient fluctuation (MMD)), compression recovery rate (%), compression load (N), and displacement (mm) at 0.1 N in repeated compression were measured. The test results are as shown in Tables 1 and 2.

  First, as shown in Table 1, the results of the strength (N) for confirming the tensile strength of the protective sleeve of the present invention were 1079 (N) for Example 1 and 1216 (N) for Example 1-2. Example 2 was 1014 (N), and it was confirmed that the copper wire protective sleeve for the motor had sufficient strength.

  Further, as shown in Table 1, the elongation (%) of the protective sleeve of the present invention is 3.4 (%) in Example 1 and 3.1 (%) in Example 1-2 when the load is 10N. Example 2 was 4.1 (%), and it was confirmed that the elongation was small as compared with Comparative Example 4 corresponding to Patent Document 3 being 4.7 (%). Also in the case of 20N load, Example 1 is 4.3 (%), Example 1-2 is 4.1 (%), and Example 2 is 4.7 (%), which corresponds to Patent Document 3. It was confirmed that the elongation was small when compared with the comparative example 4 of 5.8 (%). Therefore, according to the protective sleeve of the present invention, the operation of adjusting the range covered with the sleeve becomes easy.

  Next, as shown in Table 1, regarding the surface characteristics of the protective sleeve of the present invention, the average friction coefficient (MIU) is 0.126 in Example 1, 0.138 in Example 1-2, and Example 2. Compared with Comparative Example 4 corresponding to Patent Document 3 being 0.187, it is confirmed that the value is small and the fabric surface has a characteristic that it is easy to slip. It was. Moreover, about the friction coefficient fluctuation | variation (MMD), Example 1 is 0.0328, Example 1-2 is 0.0419, Example 2 is 0.0378, The comparative example 4 equivalent to patent document 3 Was smaller than 0.0581, and it was confirmed that the value was small and the surface of the fabric was smooth (the variation in the protective sleeve assembly was small). Therefore, according to the protective sleeve of the present invention, the tip is not caught during the insertion of the copper wire, and the copper wire can be smoothly inserted to the end.

  5A shows Example 1, FIG. 5B shows Example 1-2, FIG. 6 shows Example 2, FIG. 7A shows Comparative Example 1, and FIG. FIG. 8A is a graph showing the average friction coefficient (MIU) test results of Comparative Example 2, FIG. 8A is Comparative Example 3, and FIG. The vertical axis of each graph represents the average friction coefficient (MIU), and the horizontal axis represents the distance (cm). In the graph of Comparative Example 4 corresponding to the protective sleeve of Patent Document 3, as shown in FIG. 8B, the width of the vertical amplitude is large over the entire scanning range, whereas FIG. ), Example 1-2 of FIG. 5B. In the graph of Example 2 in FIG. 6, the width of the upper and lower amplitudes is small. Also from this point, Example 1, Example 1-2. It can be confirmed that the surface of the protective sleeve of Example 2 is slippery and smooth.

  As shown in Table 2, the compression recovery rate (%) of the protective sleeve of the present invention was 28.01 (%) in Example 1, 28.42 (%) in Example 1-2, and Example 2 Was 36.97 (%), and compared with Comparative Example 4 corresponding to Patent Document 3 being 50.08 (%), it was confirmed that the compression recovery rate was small and the conformability was high. . Therefore, according to the protective sleeve of the present invention, when binding with a binding string, the periphery thereof does not swell and become bulky, so that it is possible to accurately design the dimensions at the position of the binding string.

9A shows the first embodiment, FIG. 9B shows the first embodiment, FIG. 10 shows the second embodiment, FIG. 11A shows the first comparative example, and FIG. FIG. 12A is a graph showing a compression characteristic test result of Comparative Example 2, FIG. 12A is a graph of Comparative Example 3, and FIG. The vertical axis represents the compressive load P (gf / cm ² ), and the horizontal axis represents the sample thickness T (mm).

  In the example of FIG. 9A, X represents a forward graph until compression to the maximum compression load Pm, and Y represents a return graph when returning from the position of the maximum compression load.

WC: compression work (gf · cm / cm ² )
WC is energy until it compresses to the maximum compression load Pm, and is represented by the area of the part enclosed by ABC in the outward path X in the example of Fig.9 (a).

RC: Compression resilience (recoverability)
RC = (WC ′ / WC) × 100
Here, WC ′ is the recovery energy in the compression recovery process, and is represented by the area of the portion surrounded by ABC in the return path Y in the example of FIG. If it is a perfect elastic body, the value of RC is 100%, and the smaller the value, the higher the conformability. As described above, when the protective sleeve of the present invention is bound with a binding string, the periphery thereof does not swell and become bulky, so that the dimension can be accurately designed at the position of the binding string. Note that the compression recovery rate of 2 in the example is 36.97%, and is rounded down to the nearest 37% to 37%. In the present invention, as in Examples 1 and 2, it is more desirable to set the compression recovery rate to 37% or less.

  Further, as shown in Table 2, the compression load (N) of the protective sleeve of the present invention is 7.6 (N) in Example 1, 8.4 (N) in Example 1-2, and in Example 2 4.1 (N), compared with 17.0 (N) in Comparative Example 4 corresponding to Patent Document 3, the compressive load is small, and even in this respect, the resilience is small. It was confirmed that the compatibility was high.

  Further, as shown in Table 2, the displacement (mm) at 0.1 N in the repeated compression of the protective sleeve of the present invention is 2.059 to 2.684 (mm) in Example 1, and in Example 1-2. 1.879 to 2.595 (mm), Example 2 is 1.507 to 1.898 (mm), and Comparative Example 4 corresponding to Patent Document 3 is 0.862 to 1.142 (mm). Compared to the above, it was easy to be in a depressed state as it was repeatedly compressed, and it was confirmed from this point that the compatibility was high.

  FIG. 13A shows Example 1, FIG. 13B shows Example 1-2, FIG. 14 shows Example 2, FIG. 15A shows Comparative Example 1, and FIG. FIG. 16A is a graph showing the results of repeated compression tests of Comparative Example 2, FIG. 16A is the results of Comparative Example 3, and FIG. The vertical axis represents the load (N), and the horizontal axis represents the displacement (mm).

  In the example of FIG. 13A, the protective sleeve of Example 1 becomes a depression of 1.125 mm by the first compression, and thereafter 3.184 mm by the second compression and 3.509 mm by the third compression. The displacement is 3.699 mm in the fourth compression and 3.809 mm in the fifth compression. In Table 2, the first-time displacement is unified at 0 mm, and the second and subsequent times are obtained by calculating the difference from the first time. Comparing FIG. 13 (a) and FIG. 16 (b), the protective sleeve of the present invention is less repulsive than the protective sleeve of Comparative Example 4, and is in a depressed state as it is repeatedly compressed. It is clear that the compatibility is high.

  Further, the present inventor confirmed the insulation performance of the protective sleeve of the present invention using the protective sleeves of Example 1, Example 2, Comparative Example 3, and Comparative Example 4. The test method is as follows.

  As shown in FIG. 17, a stainless steel rod having the same diameter as the sample inner diameter of each protective sleeve was inserted, placed on a cylindrical lower electrode, and a lead wire was connected to the upper electrode. The voltage was increased at a constant rate such that dielectric breakdown of the sample occurred by applying a voltage for 10 to 20 seconds (short-time pressurization method), and the dielectric breakdown voltage was measured. The test conditions are as follows.

Test item: Dielectric breakdown voltage, partial discharge voltage Test equipment: Dielectric strength test equipment PCT-5K (manufactured by Tokyo Transformer Co., Ltd.)
Specimen size: φ7mm × 100mm
Electrode shape: Upper electrode φ7mm × 110mm
Lower electrode: φ25mm × 5mm / Edge 2.5mmR
Electrode material: Upper electrode stainless steel Lower electrode brass Boosting speed: AC 0.2 kV / sec
Pretreatment: C-72h / 22 ± 1 ° C / 60 ± 5% RH
Test atmosphere: Air; 22 ° C / 60% RH
In oil: 22 ° C, in silicon oil (JIS-C2320 insulating oil compatible product)
Number of measurements: n = 3

  Table 3 shows the measurement results of the breakdown voltage and partial discharge voltage of the sleeve in the air, and Table 4 shows the measurement results of the breakdown voltage and partial discharge voltage of the sleeve in the oil. Regarding the measurement, the creeping discharge start voltage was the voltage at which air discharge was confirmed visually, and the dielectric breakdown voltage was the voltage at the time when the sample was carbonized. However, creeping discharge did not occur in the measurement in oil.

  From Tables 3 and 4, the insulation performance of Example 1 using polyamide fibers is better than that of Example 2 using polyphenylene sulfide fibers (PPS). When the polyamide fiber is used, it is not inferior to that of the protective sleeve of Comparative Example 4, and particularly in the measurement in oil, better results are obtained than those of Comparative Examples 3 and 4.

  As described in detail above, the protective sleeves of Example 1, Example 1-2, and Example 2 are multifilaments having a single yarn fineness in the range of 28 dtex or more and 36 dtex or less and 12 filaments. Since it was set on a 48-placing string making machine with full alignment and round punching braid and round punched braided in a cylindrical shape, the copper wire can be easily inserted without using a jig, and the surface inside the sleeve It is smooth, does not catch the tip of the copper wire, and has no fuzz peculiar to multifilaments with fine single yarn fineness.

  In addition, when binding with a binding string after inserting the copper wire, there is compatibility, so the area around the location where the binding string is bound does not swell and become bulkier than the position of the binding string, preventing the miniaturization of the motor In addition to being able to solve the conventional problems that have been the cause of this, the stretchability is also moderate, so that the adjustment operation of the range covering the sleeve can be easily performed.

  In the embodiment, an example in which the single yarn fineness is 28 dtex or 36 dtex and the multifilament is 12 filaments is disclosed, but the motor copper wire protective sleeve of the present invention is included in this example. It is not limited. According to various studies by the present inventors, if the single yarn fineness is in the range of 19 dtex or more and 88 dtex or less and the number of filaments is in the range of 4 or more and 30 or less, the sleeve has a round cross section. In addition, the sleeve has a smooth interior that allows copper wires to be inserted smoothly, and is more compatible with conventional protective sleeves that use a mixture of multifilaments and monofilaments. Has been found to be obtained. Further, according to various studies by the present inventors, it has been found that it is more desirable that the single yarn fineness is in the range of 35 dtex or more and 40 dtex or less and the number of filaments is in the range of 10 or more and 20 or less. Yes.

  The copper wire protective sleeve for motors of the present invention is not limited to motors for automobiles such as motors for hybrid cars, motors for electric cars, and motors for diesel cars, but also applied to motors for household appliances such as air conditioners and refrigerators, and motors for power. It can be done.

It is a figure explaining the external appearance of the copper wire protective sleeve for motors of this invention. It is a figure explaining the adaptability of the copper wire protective sleeve for motors of this invention, (a) is the state which pressed the sleeve between the thumb and forefinger, (b) removed the finger from the state of (a). It represents the state. It is a figure explaining the elasticity of the copper wire protection sleeve for motors of this invention, (a) is a normal state, (b) is the state which pulled both ends in the left-right direction, (c) is a center direction. It represents the state pressed to. It is a figure explaining the state which inserted the copper wire of the coil of the status core of the motor of a hybrid vehicle into the conventional copper wire protective sleeve for motors, and was bound to the motor with the binding string. It is the graph showing the test result of average friction coefficient (MIU), (a) is data of Example 1, (b) is data of Example 1-2. 6 is a graph showing a test result of an average friction coefficient (MIU) of Example 2. It is the graph showing the test result of average friction coefficient (MIU), (a) is the data of the comparative example 1, (b) is the data of the comparative example 2. It is the graph showing the test result of average friction coefficient (MIU), (a) is the data of the comparative example 3, (b) is the data of the comparative example 4. It is the graph showing the test result of the compression recovery rate, (a) is data of Example 1, (b) is data of Example 1-2. 6 is a graph showing a test result of a compression recovery rate of Example 2. It is the graph showing the test result of the compression recovery rate, (a) is the data of the comparative example 1, (b) is the data of the comparative example 2. It is the graph showing the test result of the compression recovery rate, (a) is the data of the comparative example 3, (b) is the data of the comparative example 4. It is the graph showing the result of the repeated compression test, (a) is data of Example 1, (b) is data of Example 1-2. 3 is a graph showing the results of a repeated compression test of Example 2. FIG. It is the graph showing the result of the repeated compression test, (a) is the data of the comparative example 1, (b) is the data of the comparative example 2. It is the graph showing the result of the repeated compression test, (a) is the data of the comparative example 3, (b) is the data of the comparative example 4. It is a figure explaining the test method of an insulation performance test. It is a figure explaining the external appearance of the conventional copper wire protective sleeve for motors comprised only by the multifilament. It is a figure explaining the external appearance of the conventional copper wire protective sleeve for motors of the structure which made the string by mixing a multifilament and a monofilament. It is a figure explaining the resilience of the conventional copper wire protection sleeve for motors of FIG. 19, (a) is a state where the sleeve is pressed between the thumb and forefinger, and (b) is a state where the finger is moved from the state of (a). It shows the separated state. It is a figure explaining the elasticity of the conventional copper wire protection sleeve for motors of FIG. 19, (a) is a normal state, (b) is the state which pulled both ends left and right, (c) is the both ends. It shows the state of pushing in the center direction.

Explanation of symbols

S Copper wire protection sleeve for motor

Claims (1)

  A copper wire for motors characterized in that a plurality of multifilaments having a single yarn fineness in a range of 19 dtex or more and 88 dtex or less and a number of filaments in a range of 4 or more and 30 or less are aligned and round-knitted in a cylindrical shape. Protective sleeve.

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