Heat treatment process for iron core of motor

Abstract

The invention discloses a heat treatment process for an iron core of a motor and belongs to the technical field of the manufacture of motors. The process comprises the following steps of: (1) raising the temperature of an annealing furnace, and introducing DX gas into the annealing furnace after the temperature of an annealing zone of the annealing furnace is raised to 690 to 730 DEG C; (2) placing a motor iron core to be treated on a conveying belt of the annealing furnace for heating treatment; (3) introducing saturated steam into a bluing zone of the annealing furnace to ensure that the iron core which is subjected to heating treatment and enters the bluing zone is blued; and (4) cooling the iron core which is blued, and taking out. By the heat treatment process, the surface stress of iron core sheets is eliminated, the isotropy and residual magnetism are eliminated, the input power of the iron core is reduced, a damaged oxide film is repaired through bluing treatment, and the insulation between the sheets is increased; and C in an unstable valence state in a sheet material is displaced through reducing gas, so that the structural compactness of the material is improved, the stability of the material is increased, and the efficiency of the iron core is improved.

Description

Technical field [0001] The invention relates to the processing of motor iron cores, in particular to the heat treatment process of the motor iron cores. Background technique [0002] At present, the stator and rotor cores of motors are directly punched and laminated from silicon steel plates. However, the stator and rotor cores made in this way have big defects: First, in the process of silicon steel coil production, transportation, cutting, and punching, the protective layer on the surface of the silicon steel sheet is easily scratched, causing damage between the pieces and the pieces. When the motor is running, the electric potential difference is generated inside the iron core, which converts electrical energy into internal energy and increases the input power. Second, during the iron core cutting and punching process, stress is generated near the punch and acts on the magnetic field. Under the current, the iron core generates heat, which reduces output power and efficiency. ...

AI Technical Summary

Problems solved by technology

However, the stator and rotor cores made in this way have great defects: first, during the production, transportation, cutting, and punching of silicon steel coils, the protective layer on the surface of the silicon steel sheet is easily scratched, destroying the gap between the sheets and the sheets. The insulation between the cores will cause a potential difference inside the iron core when the motor is running, thereby converting electrical energy into internal energy and increasing the input power. Under the current, the iron core generates heat, which reduces the output power and reduces the efficiency