Mounting method for cementing thermister in momentum wheel

Abstract

A mounting method for bonding a thermistor in a momentum wheel comprises the following steps: the thermistor and a conductor are wiped to be clean with petroleum ether, then an eccentric groove 3 on a supporting shaft 1 of the momentum wheel and a conductor mounting groove 4 are cleaned with acetone until no oil stain exist, and then naturally dried in the shade or dried by baking and coated with a layer of epoxy glue; the thermistor is put into the eccentric groove from the right side by forceps, after a pressure plate a5 and a sleeve 6 are linked by a key pin, the supporting shaft of the momentum wheel is screwed into the sleeve, the left end of the sleeve is screwed down by a screw, and the thermistor is put into the supporting shaft and is firmly propped against the inner wall of the supporting shaft of the momentum wheel; the conductor is slightly pulled straight along the conductor mounting groove, then a U-shaped clamp sleeve is put into the eccentric groove and fixed by the screws, and clamps the conductor by the self-elasticity thereof; a pressure plate b8 with a retaining buckle is fixed and the conductor is clamped by the existing screwed holes of a flange on the supporting shaft of the momentum wheel; the mounting is completed after the thermistor is cured at ambient temperature for 12 hours; and check is performed to see whether the appearance of the bonded thermistor meets the requirements and whether electrical signals of the thermistor is normal.

Description

technical field [0001] The invention belongs to the technical field of momentum wheels, in particular to an installation method for bonding a thermistor in a momentum wheel. Background technique [0002] The momentum wheel is the key executive component in the satellite attitude control system. It uses its gyro axis alignment and the reaction torque generated by the speed change to stabilize or change the attitude of the satellite, and the bearing is the core component of the momentum wheel. The function of the thermistor is to detect the temperature of the bearing in the momentum wheel and provide data for precise control of the momentum wheel. [0003] combine figure 1 , the installation method of the thermistor in the momentum wheel is as follows: [0004] 1. Wipe the thermistor and wire with analytical pure petroleum ether, and dry naturally; [0005] 2. Clean the inside of the eccentric groove 3, that is, the thermistor installation place and the lead wire installati...

AI Technical Summary

Problems solved by technology

[0009] 1. There is no positioning device for the thermistor, which may cause the installation of the thermistor not in place, resulting in inaccurate thermal test data;

[0010] 2. Due to the elasticity of the enameled wire, the installed enameled wire is arched, and the height is higher than the vertical position of the wire installation groove 4 and is in contact with the mounting screw at the vertical position of the wire installation groove 4, causing the sheath of the enameled wire to fall off and leakage, and at the level of the wire installation groove 4 Affect the installation accuracy of support shaft 1

[0011] 3. If the amount of glue used is too small, the thermistor will not be bonded firmly. If the amount of glue used is too large, it will cause excess and pollute the bearing 2.

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