Electrically insulating resin sheet for motors and process for production thereof

A technology of electrical insulation and manufacturing method, which is applied in the field of electrical insulating resin sheets for motors and its manufacturing, can solve the problems of reduced coil slot fill rate in motors, failure to obtain high output, and reduced flexibility of resin sheets, etc., to achieve suppression Effects of degradation, high partial discharge inception voltage, and excellent electrical insulation

Inactive Publication Date: 2013-10-23
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of (1), although there is a method of adding an inorganic filler to the insulating part, the flexibility of the resin sheet will be reduced, and the problem of a decrease in insulation will occur when stress due to molding processing is applied.
In the case of (2), if the partial discharge inception voltage of the insulating member is higher than the surge voltage, corona discharge will not occur and the life will be longer. However, in order to increase the partial discharge inception voltage, it is necessary to increase the thickness of the insulating member , at this time, there is a problem that the coil slot fill rate in the motor is reduced and high output cannot be obtained

Method used

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  • Electrically insulating resin sheet for motors and process for production thereof
  • Electrically insulating resin sheet for motors and process for production thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0124] A polyetherimide resin (trade name "ULTEM1000" manufactured by Saudi Basic Industries Corporation, Tg217° C. specific gravity 1.27) was formed into a single-layer sheet with a thickness of 120 μm using a twin-screw extruder. Carbon dioxide was impregnated by throwing the unfoamed single-layer sheet into a 500 cc pressure-resistant container and keeping the inside of the tank in a carbon dioxide atmosphere at 200° C. and 25 MPa for 0.5 hour. Then, after the sheet was returned to atmospheric pressure at 300 MPa / sec, a porous resin layer made of polyetherimide with a thickness of 200 μm was obtained. The obtained porous resin layer had an average cell diameter of 4.1 μm, a porosity of 55%, and a relative permittivity of 1.8 (1 GHz).

Embodiment 2

[0126] Polyetherimide resin (trade name "ULTEM1000" manufactured by Saudi Basic Industries Corporation, Tg217°C specific gravity 1.27) and polypropylene glycol as a phase separation agent (trade name "UNIOL D-400" manufactured by NOF CORPORATION, average molecular weight 400 ) was dissolved in N-methyl-2-pyrrolidone (NMP) at a weight ratio of 100:75 to obtain a thermoplastic resin composition with a solid content concentration of 20%. This thermoplastic resin composition was applied using an applicator, and then dried at 110° C. for 10 minutes to evaporate and remove NMP to obtain a thermoplastic resin sheet with a thickness of 100 μm.

[0127] Put this thermoplastic resin sheet into a 500cc pressure-resistant container, pressurize to 25MPa in an atmosphere of 25°C, and then inject and discharge carbon dioxide at a flow rate of about 15 liters / minute to maintain the pressure. The polypropylene glycol was extracted for 5 hours to form a porous resin layer made of polyetherimide...

Embodiment 3

[0129] Polyetherimide resin (trade name "ULTEM1000" manufactured by Saudi Basic Industries Corporation, Tg217°C specific gravity 1.27) and polyetherimide resin (trade name "ULTEMXH6050" manufactured by Saudi Basic Industries Corporation, specific gravity 1.30 Tg247°C) A 200-μm-thick porous resin layer was obtained in the same manner as in Example 1, except that a single-layer sheet with a thickness of 120 μm was obtained by kneading with a twin-screw extruder at a mass ratio of 40:60. The obtained porous resin layer had an average cell diameter of 3.9 μm, a porosity of 49%, and a relative permittivity of 1.9 (1 GHz).

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Abstract

Provided are: an electrically insulating resin sheet for motors, which is used for achieving the insulation between coil wires or between a coil wire and an iron core in a motor, and which has high heat resistance, high electrical insulation performance and a high insulation breakdown voltage; and a process for producing the electrically insulating resin sheet. The electrically insulating resin sheet for motors, which is provided with a porous resin layer comprising a thermoplastic resin, is characterized in that the resin sheet has a relative permittivity of 2.0 or less at 1 GHz. It is preferred that the porous resin layer has an average cell diameter of 5.0 mum or less and contains cells in such an amount that the porosity is 30% or more.

Description

technical field [0001] The present invention relates to an electrically insulating resin sheet for motors and a method for producing the same. Background technique [0002] Conventionally, an electrically insulating resin sheet for a motor is known as an insulating member used for insulating between coil wires of a motor and between a coil wire and an iron core. These require electrical insulation between the coil wires and between the coil wires and the iron core. When the output of the motor is high, the current density increases and the temperature becomes high. Therefore, heat-resistant insulating parts have been proposed (for example, refer to Patent Documents 1 and 2). . [0003] In addition, in recent years, motors require inverter control at high voltages for energy saving and miniaturization and high performance. However, when inverter power is used to control motor drive, high surge voltage generated by the inverter invades the motor. Therefore, the insulating m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K3/34H01B3/30
CPCH01B3/301H02K3/30H01B3/306H02K3/34Y10T428/249953H01B3/30
Inventor 笠置智之请井博一吉良佳子须藤刚秋山恵子八锹晋平池永纮子
Owner NITTO DENKO CORP
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