ELIN motor Germany ELIN model ELIN price

ELIN motor is a type of motor that can be used in flammable and explosive environments, producing no electrical sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and natural gas, petrochemical, and chemical industries. In addition, they are widely used in textiles, metallurgy, urban gas, transportation, grain and oil processing, papermaking, pharmaceuticals, and other sectors. As the main power equipment, explosion-proof motors are typically used to drive pumps, fans, compressors, and other transmission machinery.

ELIN motor advantages

Advantages of the motor: Compared with asynchronous motors, permanent magnet synchronous motors have much higher efficiency values under light load, with a wide high-efficiency operating range. In the range of 25% to 120%, the efficiency is greater than 90%. The rated efficiency of permanent magnet synchronous motors can meet the Class 1 energy efficiency requirements of the current national standard, which is their biggest advantage in energy saving compared to asynchronous motors. In actual operation, motors rarely run at full power when driving loads. The reasons are: on one hand, designers generally determine the motor power based on the extreme operating conditions of the load, but extreme conditions occur rarely. At the same time, to prevent motor burnout under abnormal conditions, designers will further leave a power margin for the motor; on the other hand, motor manufacturers, to ensure motor reliability, usually leave a certain power margin beyond the power required by the user. This results in most actually operating motors working below 70% of the rated power, especially when driving fan or pump loads, where the motor usually operates in the light load region. For asynchronous motors, the light load efficiency is very low, while permanent magnet synchronous motors can still maintain high efficiency in the light load region.

ELIN motor structure

Motor rotor structure: The rotor is the rotating part of a three-phase asynchronous motor, consisting of the rotor core, rotor winding, shaft, fan, and other components. The rotor core is also part of the motor's magnetic circuit, made of stacked silicon steel sheets with uniform linear slots punched on the outer circumference, and fixed on the shaft. The rotor winding is placed in the linear slots of the rotor core. Depending on the structure of the rotor winding, three-phase asynchronous motors can be divided into squirrel-cage and wound-rotor types. The rotor winding of a squirrel-cage asynchronous motor is named for its resemblance to a squirrel cage; its structure consists of copper bars embedded in the slots as conductors, with the two ends of the copper bars welded together with short-circuit rings. Small and medium-sized squirrel-cage asynchronous motors use cheaper aluminum instead of copper, casting the rotor conductors, short-circuit rings, and fan into one piece to form a cast-aluminum squirrel-cage rotor. The core of a wound rotor is the same as that of a squirrel-cage rotor. The rotor winding is similar to the stator winding, made of insulated wire wound according to a certain pattern and embedded in the rotor slots to form a three-phase symmetrical winding. Usually, the ends of the three windings are connected together, and the starting ends are respectively connected to three mutually insulated copper slip rings fixed on the shaft, forming a star connection. The rotor winding is connected to an external three-phase rheostat through the slip rings and brushes above them, for motor starting and small-range speed regulation. The working principles of squirrel-cage and wound-rotor three-phase asynchronous motors are the same, with the only difference being the structure of the rotor winding.

ELIN motor protection device

Motor differential protection devices are mainly used in large high-voltage motors in power plants, chemical plants, and other locations. If a serious fault causes motor burnout, it will seriously affect normal production and cause huge economic losses, so comprehensive protection must be provided. Existing motor integrated protection devices mainly target small and medium-sized motors, providing protection functions such as instantaneous current cutoff, thermal overload inverse-time overcurrent, two-stage definite-time negative sequence, zero-sequence current, rotor stall, excessive start time, and frequent starting. However, for extra-large capacity motors above 2000KW, these devices cannot meet the requirements for protection sensitivity and speed during internal faults. Therefore, this device was developed to work with integrated protection devices to provide more reliable and sensitive protection measures for high-voltage motors. This device is designed as a three-phase longitudinal differential protection, because the 3KV, 6KV, and 10KV power grids where extra-large capacity motors above 2000KW are located may be grids with transformer neutral points grounded via high resistance. Three-phase longitudinal differential protection can serve not only as the main protection for phase-to-phase short circuits in the motor stator winding and lead wires, but also as the main protection for single-phase ground faults, acting to trip instantaneously.

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