Fan motor
A motor and fan technology, applied in the field of oil-resistant and waterproof fan motors
Active Publication Date: 2011-04-27
MINEBEAMITSUMI INC
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- Abstract
- Description
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- Application Information
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Problems solved by technology
Therefore, it is difficult to strike a balance between waterproof and cutting fluid resistance characteristics and thermal shock resistance characteristics without deteriorating any of the above characteristics
Method used
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example
[0060] Next, evaluation tests (thermal shock test and cutting fluid immersion test) were performed on the epoxy resin used for the fan motor according to the embodiment of the present invention. Table 1 shows a comparison between the physical properties of two epoxy resins: namely, a high hardness / high glass transition temperature epoxy resin according to this example, and a low hardness / low glass transition temperature epoxy resin according to a comparative example temperature of conventional epoxies.
[0061] Table 1
[0062]
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A fan motor is provided. The fan motor includes a case having a cylindrical bearing housing, and a base unit fixing the cylindrical bearing housing; a pair of bearings fitted into the cylindrical bearing housing; a stator which has a wound coil and a bottom portion to which a PC board including a motor driving circuit and a lead wire for supplying the motor driving circuit with electrical current is fixed; a shaft supported by the pair of bearings; a rotor which faces the stator and is fixed to the shaft, and which has a magnet; and an impeller which is fixed to an outer peripheral portion of the rotor, and has plural blades. The stator, the PC board and the lead wire are molded by epoxy resin which has hardness of Shore D85 to D95 after curing and a glass transition temperature of 125 DEG C. or higher.
Description
technical field [0001] The present invention relates to a fan motor, and more particularly, to an oil-resistant and waterproof fan motor for factory automation (FA) equipment of machines such as industrial machinery, machine tools, etc. exposed to water and / or cutting fluid. Background technique [0002] In the prior art, an axial flow fan is installed near a control unit of a machine tool or the like to cool the control unit. Since the motor of the axial fan may be exposed to water or cutting fluid, an oil-resistant and waterproof type fan motor has been adopted as the motor of the axial fan (for example, JP-A-2001-128408 and JP-A-2006-246557). [0003] In JP-A-2001-128408, an electric motor is accommodated in a case, and then the electric motor is molded with epoxy resin having a Shore hardness of D30 to D90. In JP-A-2006-246557, a core unit and a PC board including electronic components are accommodated in a mold, and then the above parts are molded with an epoxy resin c...
Claims
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IPC IPC(8): H02K5/10H02K11/00H02K15/02
CPCH02K15/12F04D25/0613H02K1/187H02K5/225H02K5/163F04D29/023H02K11/0073F04D25/0646F04D29/526H02K5/08H02K11/33F05D2300/44F05D2300/5021
Inventor 长谷川贵一筑谷精一
Owner MINEBEAMITSUMI INC
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