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<\/figure>\n\n\n\nI. Optimizing the size of the rotor\/stator laminations and the quality of the steel used in them<\/p>\n\n\n\n
Hysteresis losses and eddy current losses in asynchronous motors are together called core losses, and about 20% of the total losses are caused by eddy currents and core saturation. The eddy currents generated in the stacked sheets move relative to the changing magnetic field and can lead to significant power losses. Stacked stator cores reduce eddy current losses and based on iron mass, resistivity, density, thickness, frequency and flux density, eddy current losses can be minimized with more stacked sheets.<\/p>\n\n\n\n
Hysteresis losses are generated in the magnetic circuit when the flux is constantly changing, most of the load material used in asynchronous motors is steel for stator and rotor cores, flux density and core losses are minimized by reducing the thickness of the laminations. Hysteresis losses can be reduced by annealing a better grade of steel for the laminations to change the grain structure to facilitate magnetization. Eddy current losses are reduced by increasing the resistivity of silicon-containing steels, but the silicon content increases die wear during stamping because it increases the hardness of the steel. Steel crystals damaged during stamping severely reduce the magnetic quality of the affected volume. Annealing flattens the stack and recrystallizes the crystals damaged during stamping, thus extending a thin plate thickness into the stack.<\/p>\n\n\n\n
II. Stator lamination using the dip bath process<\/p>\n\n\n\n
Impregnated stators strengthen the electrical insulation of the stator windings against chemicals or harsh environmental influences and enhance heat dissipation. Thermoset plastics including epoxy, phenolic and polyester are used to impregnate the stator using the bath method where the stator is immersed in the resin for a longer period of time to ensure good penetration and protection. Another impregnation method is known as vacuum pressure, which uses a tank that is first emptied and then pressurized to achieve penetration of the stator. The final realization is the extraction of air pockets from the electrical windings, which improves the thermal conductivity of the windings.<\/p>\n\n\n\n
III. Designing slots in the stator to maximize the volume of insertable copper<\/p>\n\n\n\n
Asynchronous motor slot fullness to a certain extent affects the stator winding so that its low quality leads to 60% of the total losses, so in order to reduce the total losses, the stator winding must have a larger mass, thus reducing the resistance. High efficiency motors contain more than 20% extra copper compared to standard efficiency asynchronous motors, the insulated windings of the stator are placed in slots in the steel sheet. The cross-sectional area must be large enough for the motor’s power rating. Typically, asynchronous motors have open or semi-closed stator slots. In semi-closed slots, the opening of the slot is much smaller than the width of the slot, making winding more difficult and manufacturing more time-consuming than with open slots. The number of stator slots must be selected at the design stage as this number affects weight, cost and operating characteristics. Advantages of more slots are reduced leakage reactance, reduced tooth pulsation loss, and improved overload capacity. Disadvantages of more stator slots are increased cost, increased weight, increased magnetizing current, increased iron loss, poor cooling, increased temperature rise, and reduced efficiency.<\/p>\n\n\n\n
Fourth, the rotor die-casting using high-quality pure aluminum<\/p>\n\n\n\n
Custom-designed rotors can greatly increase starting torque, reduce conductor resistance and improve efficiency. They are rugged, simple and less expensive, but they have lower starting torque. Copper rotors improve efficiency, but are both difficult and expensive to manufacture.<\/p>\n\n\n\n
V. Air gap between rotor and stator to achieve a good<\/p>\n\n\n\n
The air gap is the radial distance between the rotor and stator of a standard radial asynchronous motor. In order to improve the efficiency of the design, it is necessary to maintain a good air gap. The air gap dimension involves the design of the stator, rotor, motor housing and bearings. All these affect the alignment of the stator and rotor shafts.<\/p>\n\n\n\n
VI. Enameled Wire<\/p>\n\n\n\n
Magnet or enameled wire is an electrolytically refined copper or aluminum wire that has been fully annealed and coated with one or more layers of insulation. For example, wires with a total of 12 layers of insulation are used. Typical insulating films, which increase with the temperature range, are polyethylene, polyurethane, polyester, and polyimide, with high temperatures up to 250\u00b0C. Thicker rectangular or square magnet wires wrapped in high temperature polyimide or fiberglass tape use more copper, and larger conductor bars and conductors increase the cross-sectional area of the stator and rotor windings. This lowers the resistance of the windings and reduces losses due to current. High-efficiency motors typically have 20% more copper in the stator windings.<\/p>\n\n\n\n
Asynchronous motors are composed of many parts, each zero part provides different structural and functional attributes are different, resulting in different functions in the motor system, each part provides functional advantages and disadvantages ultimately affect the motor input performance, and ultimately make the motor’s performance to reach the optimal state.<\/p>\n","protected":false},"excerpt":{"rendered":"
With motors accounting for more than 60% of the electricity used in industry, efficiency is a key design parameter, and efficiency in asynchronous motor design is more important than ever.asynchronous motor<\/p>\n","protected":false},"author":1,"featured_media":909,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[95,10],"class_list":["post-908","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news","tag-asynchronous-motor","tag-electrical-wire"],"yoast_head":"\n