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Grease composition, rolling bearing and variable frequency motor

A grease composition and a frequency conversion motor technology, applied in the field of grease compositions, can solve the problems of not considering electrical corrosion resistance and low torque characteristics, and achieve the effect of inhibiting electric corrosion and excellent low torque characteristics

Active Publication Date: 2019-06-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in their usage environment, countermeasures against galvanic corrosion resistance and low torque characteristics are not considered

Method used

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  • Grease composition, rolling bearing and variable frequency motor
  • Grease composition, rolling bearing and variable frequency motor
  • Grease composition, rolling bearing and variable frequency motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5、 comparative example 1～9

[0094] According to the formulation shown in Table 1 and Table 2, a test grease composition was prepared using base oil, thickener, and additives as raw materials. The evaluations described above were performed on the obtained test grease composition. In addition, in Comparative Example 9, Multemp SRL (dynamic viscosity (40° C.): 25 mm 2 / s) and evaluated. The results are shown in Table 1 and Table 2.

[0095] [Table 1]

[0096] [Table 1]

[0097] Table 1

[0098]

[0099] [Table 2]

[0100] [Table 2]

[0101] Table 2

[0102]

[0103] Symbol Description

[0104] 10 variable frequency motor

[0105] 11 axis of rotation

[0106] 12 rotors

[0107] 13 Stator

[0108] 14 Chassis

[0109] 20A rolling bearing

[0110] 20B Rotary bearing

[0111] 21 outer ring

[0112] 22 inner ring

[0113] 23 rotating body

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PUM

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Abstract

The grease composition of the present invention, filled into a rolling bearing for an inverter motor, has a worked penetration of 220-295 and contains a base oil comprising an alkyl diphenyl ether oil having a kinematic viscosity of 40-80 mm2 / s at 40°C, and a thickener comprising a diurea compound obtained by reacting a mixed amine comprising a cyclic monoamine and an aromatic monoamine with a diisocyanate compound, and this grease composition makes it possible to suppress electrolytic corrosion stably and for a long time, and can endow an inverter motor with excellent low-torque characteristics.

Description

technical field [0001] The present invention relates to a grease composition enclosed in a rotary bearing for an inverter motor, a rotary bearing for an inverter motor containing the grease composition, and an inverter motor using the rotary bearing. Background technique [0002] Conventionally, as a fan motor of an air conditioner, an inverter motor capable of adjusting the rotational speed or rotational speed of its rotating shaft with high precision by controlling voltage and frequency has been widely used. [0003] It is known that such an inverter motor produces a phenomenon in which a high-frequency current from an inverter circuit flows through a bearing provided in an inverter motor, thereby generating a potential difference (shaft voltage) between the outer ring and the inner ring of the bearing, When the shaft voltage reaches the dielectric breakdown voltage of the grease composition sealed inside the bearing, discharge occurs, causing galvanic corrosion that damag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M169/02F16C19/02F16C33/66H02K5/16H02K5/173C10M105/18C10M115/08C10N20/00C10N20/02C10N40/02C10N50/10
CPCC10M169/02C10M2205/0285C10M2207/0406C10M2207/1285C10M2207/2835C10M2215/1026C10N2020/02C10N2030/12C10N2040/02C10N2050/10F16C33/6633H02K5/1732C10N2010/02
Inventor 岩松宏树土井理史中野圭策黑住诚治从野知子
Owner PANASONIC CORP
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