Motor winding wire technology progress and trends
The development of enameled wire with the development of enameled wire lacquer should come into being, the 20th century 30’s PVF acetal lacquer produced in the 20th century 50’s straight weldability lacquer polyurethane (PU) lacquer produced, polyurethane initially 130 levels of the development of the later 155 levels and 180 levels of polyurethane, the scope of application from the development of the round wire to the flat wire, mainly used in inductive coils. Also in the 1950s, polyester lacquer PE lacquer produced, because of its excellent pinhole performance, has been widely used, with the advancement of technology, after THEIC modified polyester sex, hot pole from the initial 130 level, the development of 155 level and 180 level.
At the end of the 1950s, the United States Dupont first invented polyimide paint (PI), but because of its need for low-temperature refrigeration characteristics, its application at that time was subject to a lot of restrictions, mainly used in nuclear power, high-rise fire elevators and other high-demanding occasions, to the point that its application has been extended to new energy automobile drive motors.
To the 1960s polyester imide PE primer came into being, at the same time in the mid-1960s polyamide imide PAI top coat produced, so far, we have 220 levels of enameled wire (PAI) and 200 levels of composite wire (PE or PEI composite PAI). To the 1980s Japan first invented self-lubricating paint, improve the slipperiness of the enameled wire and improve the abrasion resistance of the enameled wire, to solve the motor factory due to increase the speed of winding caused by the damage to the enameled wire.
In 1995, the United States Phelps Dodge first invented corona-resistant wire enamel paint, it is the inorganic nanoparticles added to the insulating paint inside the initial corona-resistant paint belongs to the additive type, inorganic nanoparticles are relatively large, stored for a long time there will be precipitation, delamination, but also because of this feature, resulting in the thickness of the coating does not go on the paint film is less flexible in recent years with the technological advances in the inverter paint In recent years, with the advancement of technology, the inverter paint has been changed from additive type to synthetic type, the inorganic particles are also smaller, the problem of delamination and film flexibility has been greatly improved, and the scope of application has also been expanded from round wire to flat wire.
The following is an introduction to the special application of enameled wire, mainly about the enameled round wire, the first category is a high-speed winding enameled wire, with the development of miniaturization of the motor, the motor groove full rate is also higher and higher in the requirements of the enameled wire performance does not reduce the case of reducing the external dimensions of the enameled wire. At the same time, the winding speed, stretching, wire molding requirements, the enameled wire on the machine winding performance is becoming more and more high.
Next is the environmentally friendly enameled wire, the main production of two major categories. The first category is self-adhesive wire, the second category is NMP FREE, the main solvent of the current topcoat is NMP, because of its good compatibility with the topcoat, the vast majority of the topcoat insulation system solvent system on the market is a lot of NMP.
Superconducting enameled wire, as the name implies, it itself not only has a superconductor completely antimagnetic and macroscopic quantum effect, but also has excellent electrical properties, chemical resistance, mainly used in high-energy gas pedals, magnetic confinement fusion, human body magnetic resonance imaging machine, nuclear magnetic resonance spectrometer and other special areas.
Capillary copper enameled wire, which is coated with an insulating layer on the outside of the capillary copper tube, is currently mainly used in high-end refrigerators. Refrigerator aluminum instead of copper in the background, in addition to the capillary copper tube, other parts of the part has been replaced by aluminum materials, but copper and aluminum contact will occur in the proto-cell reaction, resulting in corrosion of the copper tube, affecting the life of the capillary copper tube to increase the insulating layer, the problem has been perfectly solved.
The importance of reliable welding quality of motor enameled wire and flat copper wire
Welding is a very important part of the motor production process and process. Welding will be directly related to the operational reliability and quality level of the motor. The contact resistance after welding should be small so as not to cause accidents such as localized heating, desoldering or wire breakage.
A new generation of alternative oxyacetylene welding equipment
Principle introduction: Hydrogen-oxygen machine with water as raw material, water molecules (HHO), through electrolysis, the decomposition of water into oxygen and hydrogen, hydrogen as a fuel, oxygen flux, the two gases ignited to form a hydrogen-oxygen flame, which is a clean and recyclable energy source, alternative to the existing acetylene, propane, liquefied petroleum gas and other gases, in line with the standards of enameled wire welding, weld joints without welding, small heat-affected area, resistance deviation is small. Energy-consuming medium: water, electricity. Low self-weight equipment, easy to move, easy to install and maintain, do not need to be placed in a separate space, long-term benefit, low cost.
Safety: gas is produced and used without storage, to avoid the danger of explosion; built-in multi-channel safety anti-tempering device.
Environmental protection: raw materials only water and electricity, no pollution and zero emissions, energy saving and environmental protection energy equipment.
Energy saving: 57% energy saving than traditional welding. High efficiency: Hydrogen-oxygen flame temperature up to 2800 degrees, flame concentration, no heat radiation; to achieve fast and accurate flame processing.
Convenient: welding motor enameled wires without the need to de-lacquer process; as long as there is water and electricity can be operated.
