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Cooling mechanism for axial gap type rotating machines

An axial gap, rotating machine technology, used in synchronous motors with stationary armatures and rotating magnets, cooling/ventilation devices, magnetic circuit shape/style/structure, etc., can solve copper wire breakage, lack of coil holders Cooling mechanism, low thermal conductivity, etc., to achieve the effect of high industrial practicability

Inactive Publication Date: 2010-11-17
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aforementioned epoxy resins and bakelite have low thermal conductivity
Therefore, they cannot effectively dissipate the heat generated by the copper wire (reference: the thermal conductivity of epoxy resin is 21W / mK, and the thermal conductivity of bakelite is 0.38W / mK)
Since heat generation cannot be suppressed due to lack of cooling mechanism for coil holders, copper wires are broken when axial gap rotary machines are continuously operated as generators

Method used

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  • Cooling mechanism for axial gap type rotating machines
  • Cooling mechanism for axial gap type rotating machines
  • Cooling mechanism for axial gap type rotating machines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] The present invention will be described in detail below in conjunction with the examples. Although an Nd—Fe—B based permanent magnet was described, the present invention is not limited thereto.

[0036] First, a permanent magnet is fabricated through the following steps. Nd is manufactured by melting and casting Nd, Fe, Co and M (M is Al, Si, Cu) each with a purity of 99.7% by weight and B (boron) with a purity of 99.5% by weight in a vacuum furnace 2 Fe 14 B series alloy ingot. The obtained ingot was coarsely pulverized by a jaw crusher, and further subjected to jet mill pulverization in a nitrogen stream to obtain a fine powder with an average particle diameter of 3.5 μm. The obtained fine powder is filled into a mould, and is pressed in a vertical magnetic field of 12kG at 1.0t / cm 2 molding under the molding pressure. In argon, the resulting body was sintered at 1090°C for 1 hour and then heat-treated at 580°C for 1 hour. The shape of the sintered body after he...

Embodiment 1

[0040] figure 1 The axial gap type rotary machine used in Example 1 is shown. Its material and size are similar to those of the comparative example, except that the material of the coil holder 9 is changed, a heat radiation fin 12 and a cooling fan 13 are added, and the housing 10 is extended in the radial direction.

[0041] Coil holder 9 (thermal conductivity is 18W / mK, electrical conductivity is 0.12×10 -13 S / m) is made of thermoplastic resin (liquid crystal polymer) containing inorganic mineral particles composed of alumina. Such as figure 2 As shown, the coil 8 is dipped and formed. The heat radiation sheet 12 is made of aluminum (thermal conductivity 236W / mK), and is formed on its surface with a shape structural feature that increases its surface area by 3 times, thereby effectively applying the cooling effect from the cooling fan 13 to the coil holding Item 9 on. The cooling fans 13 are those manufactured by punching and then bending or welding them. Similar to ...

Embodiment 2

[0043] figure 2 The material of the coil holder 9 was changed, and the same test as in the above-mentioned embodiment 1 was carried out. The test conditions were similar to those when testing Example 1 except that the material of the coil holder 9 was changed. Through this test, the relationship between the thermal conductivity of the coil holder 9 and the coil temperature was obtained. Test results such as Figure 7 and shown in Table 1. Note that since there is no thermal conductivity of 40W / mK (conductivity: 1×10 5 S / m), therefore the test result values ​​are not observations. Use the values ​​obtained from the heat transfer analysis using the finite element method, and add.

[0044] Table 1

[0045] Thermal conductivity of coil holder (W / mK)

[0046] These results indicate that the increase in coil temperature is small when the thermal conductivity is not less than 5 W / mK, that is, good heat release can be secured within the range of thermal conductivity n...

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Abstract

A stator has a mechanism for effectively dissipating internally generated heat, and is for use in a high power axial gap type rotating machine. The stator comprises a coil holding member and a coil secured to the coil holding member, in which the coil holding member comprises a material having a thermal conductivity of not less than 5 W / mK that is measured compliant with the ASTM E1530 and having an electrical conductivity of not more than 1105 S / m that is measured compliant with the ASTM E345. This stator preferably comprises a radiation fin, having a thermal conductivity of not less than 150 W / mK, and having a bumpy surface so as to increase the surface area thereof threefold or more, at the circumference of the coil holding member.

Description

technical field [0001] The present invention relates to a synchronous permanent magnet rotating machine used in a motor, a generator, etc., and more particularly, to an axial gap type rotating machine in which a rotor and a stator are arranged in the direction of a rotating shaft such that the rotors are opposed to each other with the stator interposed therebetween . Background technique [0002] From a structural point of view, permanent magnet rotating machines are classified into radial gap type and axial gap type. The radial gap type permanent magnet rotating machine includes a rotor and a stator, more than one permanent magnet is arranged around the rotor, the magnetic poles of the permanent magnets are arranged in a radial direction, and the stator is arranged to face the permanent magnets. Generally, the stator has a structure in which a coil is wound on an iron core having a plurality of teeth on a face facing the rotor. By using an iron core, the magnetic flux fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K9/04H02K1/12
CPCH02K9/22H02K7/14H02K21/24H02K9/04H02K3/522H02K9/227H02K9/223H02K1/20H02K1/2795H02K1/2796H02K1/04H02K2213/03
Inventor 渡边直树宫田浩二
Owner SHIN ETSU CHEM CO LTD
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