Technique for heat treatment by mixing core self-heating and external heating

Abstract

The invention discloses a technique for heat treatment by mixing core self-heating and external heating. The technique comprises the steps as follows: a capacitor core is put into a temperature-controlled box body and is connected with a power supply for voltage modulation and frequency modulation; the power supply applies certain AC voltage to the capacitor core, so that the capacitor core loses power and generates heat for internal heating; and the temperature-controlled box body is heated to carry out external heating on the capacitor core, so that the heat treatment process is achieved through cooperation of internal heating and external heating. The whole capacitor core can be uniformly heated during heat treatment through cooperation of an internal heating effect and an external heating effect; the condition that inside original bubbles and moisture can be eliminated is ensured; an internal medium of the capacitor core can shrink at the same time; creases are effectively reduced; an interlayer gap is eliminated; and new bubbles and moisture which cannot be eliminated are avoided.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a heat treatment method for a core by mixing self-heating and external heating. Background technique [0002] The heat treatment method for the capacitor core in the prior art is: put a single capacitor core code into an electric oven and use the set temperature of the oven to heat-treat the capacitor core. The disadvantages of this method are as follows: 1. During heat treatment, the heat borne by the capacitor core is conducted from the outer layer of the spiral-shaped capacitor core to the inner layer, and there are gaps between the inner ring parts of the processed product, which cannot be well 2. Increase the possibility of interlayer breakdown during capacitor operation. Contents of the invention [0003] Aiming at the above technical problems, the present invention provides a heat treatment method in which the self-heating of the core is mixed with external heating. The...

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Problems solved by technology

The disadvantages of this method are as follows: 1. During heat treatment, the heat borne by the capacitor core is conducted from the outer layer of the spiral-shaped capacitor core to the inner layer, and there are gaps between the inner ring parts of the processed product, which cannot be well 2. Increase the possibility of interlayer breakdown in the capacitor operation