The motor provides more than 60% of the industrial power. Efficiency is an important setting correction parameter. The efficiency of single-phase asynchronous motor setting correction is more important than ever. Efficiency is defined as the ratio of mechanical power delivered to power supplied. A motor with a high efficiency of 85% converts 85% of the electromagnetic energy into mechanical kinetic energy, and the remaining 15% is dissipated as heat.
Environmentally friendly and energy-saving single-phase asynchronous motors use high-quality raw materials and reliable design to achieve higher efficiency. For example, the higher the aluminum content in the motor rotor, the higher the slot filling index in the motor stator, and the less damage to the resistors. Improved motor rotor construction and rotor-to-motor stator flux density reduces stray load damage. The improved cooling fan design makes the wind resistance loss of single-phase asynchronous motor cooling small, and the rotor and stator cores are made of higher quality and thinner steel laminations, which can greatly reduce the magnetization loss. After that, the reduction in friction losses is caused by higher quality bearings.
Optimizing the size of the rotor/stator laminations and the quality of the steel used
The hysteresis loss and eddy current loss in the single-phase asynchronous motor are called transformer skeleton loss together, and about 20% of the total loss is caused by the saturated state of the vortex and the transformer skeleton. The vortices created in the winding move relative to the continuously changing electromagnetic field, causing significant output power damage. Laminated motor stator transformer bobbins can reduce eddy current losses, and depending on iron quality, resistance, relative density, thickness, frequency and magnetic flux density, eddy current losses can be minimized with a large number of windings.
The hysteresis loss is caused by the continuous change of the magnetic flux in the equivalent circuit. Most of the load materials used in the single-phase asynchronous motor are the steel used for the rotor core of the motor. According to the reduction of the winding thickness, the magnetic flux density and the transformer skeleton are lost. Minimize. According to quenching, a stronger grade of winding steel is used to change the crystal structure to facilitate magnetization, which can reduce the hysteresis loss of single-phase asynchronous motor. The eddy current loss is reduced by increasing the resistance of the silicon-containing steel sheet, but the silicon component increases the damage of the abrasive tool during the whole process of the stamping die, because it increases the hardness of the steel. The steel crystals destroyed in the whole process of the stamping die seriously reduce the magnetic quality of the affected volume. Quenching flattens the winding and work-hardens the crystals damaged during the stamping die process, thereby widening a sheet metal thickness into the winding.
Stator Lamination Using Immersion Bath Process
The prepreg single-phase asynchronous motor stator lifts the electrical equipment insulation layer of the motor stator winding, avoids chemicals or extreme environmental hazards, and improves heat dissipation. The polyurethane elastomer contains epoxy resin glue, urea-formaldehyde resin and polyester to prepreg the motor stator. The bath method is to infiltrate the motor stator into the epoxy resin for a long time to ensure the best penetration and maintenance. Another prepreg method is called vacuum pump working pressure, which uses a tank that is drained first and then pressurized to complete the infiltration of the stator of a single-phase asynchronous motor. Finally, the air pockets are extracted from the electrical winding, which improves the thermal conductivity of the winding.
Design the slots in the stator to maximize the volume of copper that can be inserted
A certain level of slot full rate of a single-phase asynchronous motor will harm the stator winding of the motor and make its quality low, which will cause 60% of the total loss. Therefore, in order to better reduce the total loss, the quality of the motor stator winding must be large, thereby reducing resistors. . Compared with the standard high-efficiency single-phase asynchronous motor, the high-efficiency motor has more than 20% additional copper, and the insulation layer winding of the motor stator is placed in the slot body of the steel plate. The cross-sectional area must be large enough to take into account the maximum power of the motor. Under normal circumstances, single-phase asynchronous motors use open or semi-closed motor stator slots. In a semi-closed groove, the opening of the groove is much smaller than the overall width of the groove. Compared with an open groove, the coiling is more difficult and the production is more time-consuming. The total number of motor stator slots must be selected in the design, as this number affects net weight, cost and operating characteristics. The advantages of multiple slots are to reduce leakage reactance, reduce tooth pulsation beverage consumption, and improve load working capacity. The disadvantages of a large number of motor stator slots are increased cost, increased net weight, increased magnetized current, increased iron loss, poor cooling, and increased temperature rise. High efficiency reduction.
Rotor die-casting is made of high-quality pure aluminum
The custom-designed single-phase asynchronous motor rotor can maximize motor torque, reduce electrical conductor resistors, and improve work efficiency. They are durable, simple in construction and less expensive, but they have lower starting torque. Copper motor rotors increase efficiency, but are difficult and expensive to manufacture.
Optimum air gap between rotor and stator
The air gap is the radial distance between the rotor and stator of a standard radial single-phase asynchronous motor. In order to improve the setting correction efficiency, it is necessary to maintain a good air gap. The air gap size involves the setting correction of the stator, rotor, motor housing, and bearing. All of these affect the alignment of the stator and rotor shafts.
enameled wire
Magnet or wire-covered wire is an electrolytically refined copper or aluminum wire cable that has been thoroughly quenched and coated with one or two layers of cable jacket. For example, use a cable with a total of 12 cable jackets. Typical insulating layer films, along with the increase in temperature range, include high pressure polyethylene, polyurethane materials, polyester and polyimide films, and the high temperature reaches 250°C. The thicker rectangular frame or square magnet wire is encapsulated with high temperature polyimide film or glass fiber tape, and a large amount of copper is used. Larger electrical conductor bars and electrical conductors increase the cross-sectional area of the motor rotor winding. This reduces the number of resistors in the winding and reduces the loss caused by the amount of current, and the copper in the stator winding of the high-efficiency single-phase asynchronous motor is generally freed by 20%.
The single-phase asynchronous motor is composed of many parts, each part provides different structures and basic functions, resulting in different functions in the motor system software, and the performance of each part will ultimately affect the key characteristics of the motor. . According to the characteristics of each component of the lifting motor, the characteristics of the motor are finally optimized.
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