Hence understanding the basics of motors such FLA, LRA, SFA, classification of the insulation of the motor windings, mounting, bearings and mechanism are essential to service the motors..
make sure the motor is rated at Hz or else the speed of the motor may be different from its rated speed..
it will cause the lifetime of the motor to drop as hot spot on the windings may occur.
By the motor when running at full load, FLA or full-load amperage is the current drawn.
LRA or locked-rotor amperage is the current drawn when the motor is starting and the rotor has yet to turn.
Service amperage or SFA may be printed on the plate or in the sheet of the motor.
The motors are divided into different insulation type based on the ability of the windings to withstand the ambient and temperature rise during operation.
The quality of the insulation will determine the ability to withstand the temperature rise during operation.
The design of the mounting and dimensions are governed by NEMA which has frame numbers for each type of mounting.
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