Copper Winding Wire is the main raw material for many kinds of motors. As a motor manufacturer, how to quickly determine the quality of the copper winding wire is important. The inspection and control of copper winding wire is set in the incoming inspection link, and the inspection and control means are very important.
A thin layer of paint film shall ensure that the current passing through the coil is looped along the core wire to ensure that electromagnetic induction enables the motor and electric appliance to function. If the dielectric property of the paint film is not enough, the coil will be short-circuited.
If the resistance value of the copper winding wire is too large or too small, the total resistance value of the wound winding wire will change. The variation range of the total resistance exceeds the allowable tolerance in the design, which will affect the balance of the three-phase voltage of the motor and the temperature rise of the motor.
Under the action of a strong electric field, the confined electrons in the polymer can obtain energy from the electric field and become free electrons, which move in the direction of the electric field. When free electrons collide with other constrained electrons in motion, they are excited to become free electrons, thus increasing the number of free electrons and improving the conductivity of polymers. When the electric field strength exceeds a certain value, a pore passage connecting the two electrodes is formed in the polymer, so that the current being strengthened passes through the pore passage, and the polymer loses its insulating property and is broken down. At this time, the strength of the applied voltage is called the breakdown voltage. The heat generated during voltage breakdown will cause thermal damage to polymers, which will lead to melting and scorching.
Factors affecting breakdown voltage: film thickness and out-of-roundness, curing degree, external impurities in the paint. Factors affecting breakdown voltage test data: twist number, voltage application time, boosting speed, paint film elongation, and temperature under pressure.