Aluminum shell PTC (positive temperature coefficient) brake resistor

Abstract

The invention relates to an aluminum shell PTC (positive temperature coefficient) brake resistor which comprises a PTC core, an upper contact piece, a lower contact piece, a contact plate, a leading-out conductor, a positioning frame, an aluminum shell and an insulation sleeve. The upper surface and the lower surface of the PTC core are fitted with the upper contact piece and the lower contact piece and electrically connected with the outside through the leading-out conductor welded at one end of the contact plate, the vertically laminated PTC core and the contact pieces are positioned and fixed by the positioning frame, the insulation sleeve sleeves the outer side of the PTC core, and then the PTC core is embedded into the aluminum shell and fixed. Compared with the prior art, the brake resistor has the advantages of compact part structure, easiness in machining, good mechanical performance and the like.

Description

technical field [0001] The invention relates to the field of electrical control systems, in particular to an aluminum shell PTC braking resistor. Background technique [0002] PTC (Positive Temperature Coefficient) ceramic materials are used as overheating protectors or temperature-controlled heaters due to their rapid rise in resistance at specific high temperatures. At the same time, under some medium and small power load conditions, PTC can also be applied to the resistive material during system charging and discharging or braking to convert the overload current. However, unlike other resistive materials, PTC ceramic materials generally have the defects of low carrying current density and poor mechanical strength. Therefore, in product design, while taking into account material cost and manufacturability, special consideration must be given to the strengthening of conductive contacts and the stability of PTC structures. sex. The traditional PTC resistor design still use...

AI Technical Summary

Problems solved by technology

However, unlike other resistive materials, PTC ceramic materials generally have the defects of low carrying current density and poor mechanical strength. Therefore, in product design, while taking into account material cost and manufacturability, special consideration must be given to the strengthening of conductive contacts and the stability of PTC structures. sex

The traditional PTC resistor design still uses the general structure of the aluminum casing wirewound resistor, but there are still risks such as poor positioning accuracy of the core, poor process stability, and fragile PTC cores, which affect the application of products in some applications with higher requirements. use in the field

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