JP5227104B2 - Interphase insulating material - Google Patents

Interphase insulating material Download PDF

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JP5227104B2
JP5227104B2 JP2008191600A JP2008191600A JP5227104B2 JP 5227104 B2 JP5227104 B2 JP 5227104B2 JP 2008191600 A JP2008191600 A JP 2008191600A JP 2008191600 A JP2008191600 A JP 2008191600A JP 5227104 B2 JP5227104 B2 JP 5227104B2
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adjacent
coil
interphase insulating
dielectric
slot
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JP2010035253A (en
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敬次 滝澤
芳樹 高橋
淳 藤木
靖之 木原
修 加藤
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トヨタ自動車株式会社
日東シンコー株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Description

  The present invention relates to an interphase insulating member.

  For example, when an inverter power supply is used to drive a motor, a steep surge voltage generated by the inverter causes a high voltage between the windings (coils) of the motor compared to when driving a conventional commercial frequency power supply. In recent years, it has been elucidated that a shared voltage between coils is generated.

  Patent Document 1 discloses a low-voltage motor in which a bypass circuit in which a capacitance capacitor is connected between coils is formed in order to relieve a voltage shared between the coils with respect to a surge voltage. Patent Document 2 discloses an interphase insulating element made of polyethylene terephthalate having flexibility.

JP 2005-65363 A JP-A-3-40731

  For example, in an electric vehicle motor, an inverter power supply is used for driving the motor, and as described above, a shared voltage between the motor coils is generated. Due to this shared voltage, there is a risk of insulation deterioration between the coils.

  The present invention has been made in view of the above problems, and provides an interphase insulating member that relaxes the above-mentioned shared voltage.

  In order to achieve the above object, the interphase insulating member of the present invention has the following characteristics.

(1) An interphase insulating member that is interposed between and insulated from stator coils of different phases wound around respective teeth of a stator in a motor, wherein the interphase insulating member is a coil of different two-phase stator coils A coil end adjacent portion interposed between the ends, a slot provided between each tooth and a slot adjacent portion interposed between the stator coils, and a relative dielectric constant ε of the coil end adjacent portion in the interphase insulating member e, the interphase insulating high rather than the relative dielectric constant epsilon s of the slot adjacent portion of the member, and the coil end adjacent portion and the slot adjacent portion of the interphase insulating member is integral interphase insulating members together, said slot The adjacent portion is made of a low dielectric member, and the coil end adjacent portion is made of a high dielectric rubber layer or a high dielectric resin layer on at least one surface of the low dielectric member. High dielectric member flexible made is provided a interphase insulating member.

  The coil end adjacent portion of the interphase insulating member is made to be a high dielectric material in order to disperse the potential of the adjacent coil, while the slot adjacent portion of the interphase insulating member is made of a low dielectric material to suppress the capacitance. To be. Thereby, the shared voltage between the coils in the motor can be relaxed, and as a result, the dielectric breakdown between the coils in the motor can be prevented.

Since the dielectric members having two types of relative dielectric constants are integrally molded, the integral interphase insulating member can be easily mounted on the throttle in the stator of the motor with a reduced number of steps. Furthermore, with the above configuration, an interphase insulating member made of a member having a different relative dielectric constant can be easily manufactured. For example, when an integrated interphase insulating member is made, a dielectric made of a completely different member is used. It can be easily produced as compared with a member integrally molded.

( 2 ) The interphase insulating member according to (1 ) , wherein a relative dielectric constant ε e of the coil end adjacent portion is 4 or more and a relative dielectric constant ε s of the slot adjacent portion is 3 or less. It is.

  Since each dielectric member of the interphase insulating member has the above relative dielectric constant, it is possible to prevent dielectric breakdown between the coils in the motor.

( 3 ) In the interphase insulating member according to (1) or (2), the high dielectric rubber layer is made of silicone rubber or nitrile rubber containing carbon or barium titanate, and the high dielectric resin layer is made of nylon. And an epoxy group-containing phenoxy resin.

  ADVANTAGE OF THE INVENTION According to this invention, the phase insulation member which can ease the shared voltage between the coils of a motor can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial perspective view showing an example of a stator core of a motor in a state where no coil is wound around the teeth as viewed from the end face 10A of the stator core. As shown in FIG. 1, the stator core 10 includes teeth 1 to 6 and throttles 11 to 18 provided between the teeth 1 to 6. Each of the teeth 1 to 6 has a coil a predetermined number of times. As a result, the stator coils of different phases are formed adjacent to each other.

As shown in FIG. 2, the interphase insulating member in the present embodiment is an interphase insulating member 100 that is interposed between the stator coils 40 of different phases wound around the teeth of the stator in the motor and insulates each other. The interphase insulating member 100 includes a coil end adjacent portion 30 interposed between coil ends of different two-phase stator coils 40, slots 11 to 18 provided between the teeth 1 to 6 shown in FIG. The relative dielectric constant ε e of the coil end adjacent portion 30 in the interphase insulating member 100 is greater than the relative dielectric constant ε s of the slot adjacent portion 20 in the interphase insulating member 100. Highly made. On the other hand, FIG. 3 shows a configuration of a conventional interphase insulating member 200. As shown in FIG. 3, the conventional interphase insulating member 200 is integrally formed of a material having the same relative dielectric constant.

  In the present embodiment, the coil end adjacent portion 30 of the interphase insulating member 100 is made to be a high dielectric material in order to disperse the potential of the adjacent stator coil, while the slot adjacent portion 20 of the interphase insulating member 100 is By forming it to be a low dielectric material in order to suppress the capacitance, it is possible to relax the voltage sharing between the coils in the motor, and as a result, it is possible to prevent dielectric breakdown between the coils in the motor. Here, the shared voltage is calculated by calculating the voltage distribution when a unit step voltage is applied by approximating the electromagnetic winding with a circuit formed by the distributed capacitance between the windings and the ground distributed capacitance of each part of the winding. Thus, the voltage sharing between the windings can be analyzed (written by Masayuki Ieda, Hyundai High Voltage Engineering, Ohmsha, p. 91-93).

Furthermore, in the interphase insulating member 100, the relative dielectric constant ε e of the coil end adjacent portion 30 is 4 or more and 200 or less, preferably 4 or more and 100 or less, and more preferably 4 or more and 30 or less. Here, in order to produce the coil end adjacent portion 30 having a relative dielectric constant ε e exceeding 200, for example, the coil end adjacent portion 30 needs to contain a large amount of high dielectric material. This is because the strength of the portion 30 may be impaired. On the other hand, the relative dielectric constant ε s of the slot adjacent portion 20 is preferably 3 or less in order to suppress the capacitance. Further, as described above, the coil end adjacent portion 30 and the slot adjacent portion 20 of the interphase insulating member 100 each have the above-described relative dielectric constant, so that, for example, the shared voltage can be reduced by 10% or more.

  Next, an example of the configuration of the interphase insulating member in the present embodiment will be described with reference to FIGS. First, FIG. 4 shows a configuration of a low dielectric material used for the slot adjacent portion 20 in the interphase insulating member of the present embodiment. As shown in FIG. 4, the slot adjoining portion 20 includes a base sheet 22 and an aramid made of non-woven paper of porous aramid resin provided on both surfaces of the base sheet 22 with adhesive layers 24 respectively. Non-woven paper 26 (for example, “Nomex Paper” manufactured by DuPont).

As the said base material sheet 22, a polyethylene terephthalate film and a polyethylene naphthalate film can be used, for example. The adhesive for forming the adhesive layer 24 is preferably an acrylic adhesive having insulating properties and viscoelasticity. Further, as the aramid nonwoven paper 26, for example, a wholly aromatic polyamide paper (including “NOMEX paper”) disclosed in Japanese Patent Application Laid-Open No. 2008-119999 can be used. the amount is 5 g / m 2 or more, and preferably 30 to 40 g / m 2, the thickness of the wholly aromatic polyamide paper is at 50μm or more from the viewpoint of the mechanical properties and shape retention, the density of the wholly aromatic polyamide paper is usually 0 0.1 to 1.2 g / cm 3 , preferably 0.6 to 0.8 g / cm 3 .

Next, the configuration of a flexible high dielectric material used for the coil end adjacent portion 30 in the interphase insulating member according to the present embodiment will be described with reference to FIGS. 5 to 8. First, in the coil end adjacent portion 30 a shown in FIG. 5, a high dielectric rubber layer 32 is formed on one surface of a low dielectric material used for the above-described slot adjacent portion 20 via an adhesive layer 24. As described above, the adhesive for forming the adhesive layer 24 is preferably an acrylic contact agent having insulating properties and viscoelasticity. The high dielectric rubber layer 32 can be made of silicone rubber or nitrile rubber kneaded with carbon or barium titanate. Moreover, the thickness of the high dielectric rubber layer 32 is, for example, 700 μm, and by using the thick high dielectric rubber layer 32, the adhesion between the coil end adjacent portion 30a and the stator coil is improved. The effect of suppressing the shared voltage is high. The content of carbon or barium titanate contained in the high dielectric rubber layer 32 is appropriately adjusted in order to obtain a predetermined relative dielectric constant ε e in the coil end adjacent portion 30.

  In the coil end adjacent portion 30b shown in FIG. 6, the high dielectric rubber layer 32 is formed on both surfaces of the low dielectric material used for the slot adjacent portion 20 with the adhesive layer 24 interposed therebetween. As described above, the adhesive for forming the adhesive layer 24 is preferably an acrylic contact agent having insulating properties and viscoelasticity. The high dielectric rubber layer 32 may be made of silicone rubber or nitrile rubber kneaded with carbon or barium titanate as described above. The coil end adjacent portion 30b uses, for example, a 700 μm thick high dielectric rubber layer 32 on both sides, thereby improving the adhesion between the coil end adjacent portion 30b and the stator coil. As a result, the effect of suppressing the shared voltage is improved. high.

  In the coil end adjacent portion 30c shown in FIG. 7, the resin layer 34 is directly formed on one surface of the low dielectric material used for the slot adjacent portion 20 described above. The resin layer 34 is a high dielectric material, and is made of, for example, a copolymer of nylon and an epoxy group-containing phenoxy resin. Since the coil end adjacent portion 30c has a resin layer 34, which is a high dielectric material, on one side, the surface of the coil end adjacent portion 30c is particularly smooth. When assembling, the outermost surface described above is easier than the interphase insulating member of the rubber layer. Here, the thickness of the resin layer 34 made of the high dielectric material shown in FIG. 7 is 50 to 300 μm, and preferably 40 to 80 μm.

In the coil end adjacent portion 30 d shown in FIG. 8, the resin layer 34 is directly formed on both surfaces of the low dielectric material used for the slot adjacent portion 20 described above, and the aramid nonwoven paper 26 is laminated on the resin layer 34. Here, the resin layer 34 is a high dielectric material, and is made of, for example, a copolymer of nylon and an epoxy group-containing phenoxy resin, as described above, and the aramid nonwoven paper 26 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-119999. it is wholly aromatic polyamide paper is able to use (including the "Nomex paper"), the basis weight of these wholly aromatic polyamide paper is 5 g / m 2 or more, and preferably 30 to 40 g / m 2, the total The thickness of the aromatic polyamide paper is 50 μm or more from the viewpoint of mechanical properties and shape retention, and the density of the wholly aromatic polyamide paper is usually in the range of 0.1 to 1.2 g / cm 3 , preferably 0.6 to 0. The range is 0.8 g / cm 3 . Since the aramid nonwoven paper 26 is present in the uppermost layer, the mechanical properties are high and the shape retention properties are also excellent. Here, the thickness of the resin layer 34 made of the high dielectric material shown in FIG. 8 is 10 to 50 μm, and preferably 15 to 30 μm.

  The interphase insulating member 100 in the present embodiment is an integrated interphase insulating member in which a slot adjacent portion 20 made of a low dielectric material and a coil end adjacent portion 30 made of a high dielectric material are integrated. As described above, the coil end adjacent portion 30 made of a high dielectric material is made of the low dielectric material used for the slot 20 as in the coil end adjacent portions 30a, 30b, 30c, and 30d shown in FIGS. Used as a base material. Therefore, when the interphase insulating member is formed integrally, the low dielectric material used for the slot 20 shown in FIG. 4 is used as the base material, and only the coil end adjacent portion 30 has the configuration shown in FIGS. Such an adhesive layer 24, a high dielectric rubber layer 32, a resin layer 34, and an aramid nonwoven paper 26 can be laminated.

  Hereinafter, the interphase insulating member of the present invention will be described with reference to examples. The present invention is not limited to the following examples as long as it does not exceed the gist thereof.

[Comparative Example 1]
The shared voltage Vp of the integrated interphase insulating member shown in FIG. 3 made of a low dielectric material having the configuration shown in FIG. 4 and a relative dielectric constant ε of 3 was 516V. The relative dielectric constant of the low dielectric material having the configuration shown in FIG. 4 was measured using an apparatus of “Impedance Analyzer 4294A” (manufactured by Agilent).

[Example 1]
4 and the coil end adjacent portion 30a configured as shown in FIG. 5, and is an interphase insulating member configured as shown in FIG. 2, and is a ratio of the slot adjacent portion 20 and the coil end adjacent portion 30a. As a result of measuring the dielectric constant using the above-described shared voltage measuring device, the relative dielectric constant ε s of the slot adjacent portion 20 is 2.6, and the relative dielectric constant ε e of the coil end adjacent portion 30a is 17.6. Met. The shared voltage Vp in the interphase insulating member of Example 1 having the above configuration was 461V.

[Example 2]
4 and the coil end adjacent portion 30b configured as shown in FIG. 6, and is an interphase insulating member configured as shown in FIG. 2, and is a ratio between the slot adjacent portion 20 and the coil end adjacent portion 30b. As a result of measuring the dielectric constant using the shared voltage measuring device described above, the relative dielectric constant ε s of the slot adjacent portion 20 is 2.6, and the relative dielectric constant ε e of the coil end adjacent portion 30b is 20.2. Met. The shared voltage Vp in the interphase insulating member of Example 2 having the above-described configuration was 449V.

[Example 3]
4 and the coil end adjacent portion 30c having the configuration shown in FIG. 7, which is an interphase insulating member having the configuration shown in FIG. 2, and is a ratio between the slot adjacent portion 20 and the coil end adjacent portion 30c. As a result of measuring the dielectric constant using the above-described shared voltage measuring device, the relative dielectric constant ε s of the slot adjacent portion 20 is 2.6, and the relative dielectric constant ε e of the coil end adjacent portion 30c is 9.8. Met. The shared voltage Vp in the interphase insulating member of Example 3 having the above-described configuration was 477V.

[Example 4]
4 and the coil end adjacent portion 30d having the configuration shown in FIG. 8, and is an interphase insulating member having the configuration shown in FIG. 2, and is a ratio of the slot adjacent portion 20 and the coil end adjacent portion 30d. As a result of measuring the dielectric constant using the shared voltage measuring device described above, the relative dielectric constant ε s of the slot adjacent portion 20 is 2.6, and the relative dielectric constant ε e of the coil end adjacent portion 30d is 4.0. Met. The shared voltage Vp in the interphase insulating member of Example 4 configured as described above was 486V.

  In each of Comparative Example 1 and Examples 1 to 4, “Nomex Paper” manufactured by DuPont was used as the aramid nonwoven paper 26. From the above, it was found that compared to the result of Comparative Example 1, Examples 1 to 4 can reduce the shared voltage. Further, it has been found that the configuration of the coil end adjacent portions 30a and 30b in the first and second embodiments has a higher shared voltage reduction effect than the configurations of the coil end adjacent portions 30c and 30d in the third and fourth embodiments.

  The present invention is suitable for the motor manufacturing industry, for example.

It is a partial perspective view which shows an example of the stator core of the motor of the state in which the coil is not wound by the tooth | gear in which the phase insulation member of this invention is used. It is a figure explaining an example of the composition of the phase insulation member of the present invention. It is a figure explaining an example of the composition of the conventional phase insulation member. It is sectional drawing explaining an example of a structure of the throttle adjacent part in the interphase insulation member of this invention. It is sectional drawing explaining an example of a structure of the coil end adjacent part in the phase insulation member of this invention. It is sectional drawing explaining other examples of the structure of the throttle adjacent part in the phase insulation member of this invention. It is sectional drawing explaining other examples of the structure of the throttle adjacent part in the phase insulation member of this invention. It is sectional drawing explaining other examples of the structure of the throttle adjacent part in the phase insulation member of this invention.

Explanation of symbols

  10 Stator Core, 20 Slot Adjacent Portion, 22 Base Sheet, 24 Adhesive Layer, 26 Aramid Nonwoven Paper, 30, 30a, 30b, 30c, 30d Coil End Adjacent Portion, 32 High Dielectric Rubber Layer, 34 Resin Layer, 40 Stator Coil , 100, 200 Interphase insulating member.

Claims (3)

  1. An interphase insulating member that is interposed between the stator coils of different phases wound around each tooth of the stator in the motor and insulates each other,
    The interphase insulating member has a coil end adjacent portion interposed between coil ends of different two-phase stator coils, and a slot adjacent portion interposed between a slot provided between each tooth and the stator coil,
    The dielectric constant epsilon e of the coil end adjacent portion of the interphase insulating member is rather high than the dielectric constant epsilon s of the slot adjacent portion of the interphase insulating member,
    The interphase insulating member is an integrated interphase insulating member in which a coil end adjacent portion and a slot adjacent portion are integrated.
    The slot adjacent portion is made of a low dielectric member,
    The inter-phase insulating member is characterized in that the coil end adjacent portion is provided with a flexible high dielectric member made of a high dielectric rubber layer or a high dielectric resin layer on at least one surface of the low dielectric member.
  2. The interphase insulating member according to claim 1 ,
    The relative dielectric constant ε e of the coil end adjacent portion is 4 or more,
    A relative dielectric constant ε s of the slot adjacent portion is 3 or less.
  3. In the interphase insulating member according to claim 1 or 2,
    The high dielectric rubber layer is made of silicone rubber or nitrile rubber containing carbon or barium titanate,
    The interphase insulating member, wherein the high dielectric resin layer is made of a copolymer of nylon and an epoxy group-containing phenoxy resin.
JP2008191600A 2008-07-25 2008-07-25 Interphase insulating material Active JP5227104B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6342694B1 (en) 1998-08-25 2002-01-29 Oki Electric Industry Co., Ltd. Adjustable-free optical signal receiver
WO2020099306A1 (en) * 2018-11-14 2020-05-22 Ebm-Papst Mulfingen Gmbh & Co. Kg Insulation system for reducing the insulation damage to the windings of an electric motor

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Publication number Priority date Publication date Assignee Title
JP2014087101A (en) * 2012-10-19 2014-05-12 Toyota Motor Corp Stator of dynamo-electric machine
JP5931097B2 (en) * 2014-01-22 2016-06-08 古河電気工業株式会社 Insulated wire and method for manufacturing the same, rotating electric machine and method for manufacturing the same

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US4266994A (en) * 1979-02-01 1981-05-12 General Electric Company Methods for making dynamoelectric machine phase insulators
JPS5775548A (en) * 1980-10-28 1982-05-12 Meidensha Electric Mfg Co Ltd Anti-surge rotary electric machine
JPH01264540A (en) * 1988-04-14 1989-10-20 Toshiba Corp Motor winding by variable-frequency drive
JPH05336713A (en) * 1992-06-03 1993-12-17 Odawara Eng:Kk Inserting method for interlayer insulation paper and its equipment
JP3262110B2 (en) * 1999-10-26 2002-03-04 松下電器産業株式会社 Compressor and refrigerant system device using the same
JP2004048831A (en) * 2002-07-09 2004-02-12 Hitachi Ltd Electric equipment and sic semiconductive tape
JP4277547B2 (en) * 2003-03-20 2009-06-10 アイシン・エィ・ダブリュ株式会社 Insulating paper for electric motors and electric motors
JP4316948B2 (en) * 2003-08-14 2009-08-19 株式会社日立産機システム Low pressure motor
JP4461820B2 (en) * 2004-01-30 2010-05-12 トヨタ自動車株式会社 Interphase insulating paper and electric motor provided with the same
JP4980631B2 (en) * 2006-03-16 2012-07-18 トヨタ自動車株式会社 Interphase insulating member and rotating electric machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6342694B1 (en) 1998-08-25 2002-01-29 Oki Electric Industry Co., Ltd. Adjustable-free optical signal receiver
WO2020099306A1 (en) * 2018-11-14 2020-05-22 Ebm-Papst Mulfingen Gmbh & Co. Kg Insulation system for reducing the insulation damage to the windings of an electric motor

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