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what is the Space heater? why using in Electrical motor?

Answer Posted / ash

When a motor is built as a "totally enclosed" (TE) unit, no free interchange of air can take place between interior and exterior. That's good protection against entry of solid or liquid contaminants.

But no enclosure can be airtight. As the TE motor heats and cools between "on" and "off," or from day to night, outside air will "breathe", in and out, and the water vapor in that air will condense on interior surfaces of winding and bearings. The result will eventually be insulation failure and bearing corrosion.

To prevent that, the motor's interior needs to be kept warm — above the condensation temperature — whenever it's not running. This is particularly true for motors that run only a few hours a day, are seasonally idle, or are installed in unusually damp locations. It's not a function of motor size or type. The same conditions exist, and will be equally damaging, whether the motor is 1 horsepower or 1000.

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