Causes and preventive measures of motor fire
A common cause of electric motor of fire:
The 1 motor in operation, because the heat coil, mechanical damage, poor ventilation and other reasons and burnt or damaged insulation motor short-circuit combustion.
2 motor for driving load is too large or the power supply voltage to reduce the motor torque reduction is caused by the over load; power of motor in operationphase (a phase disconnection) caused by motor speed reducing and seriousoverload in the remaining two phase. Long time load will cause the motorinsulation aging acceleration, even damaged, the heat caused by combustion.
Interphase short circuit, winding inter turn short circuit, single-phase groundingfault occurred in 3 motor stator windings in the coil current, surge, cause overheating and the insulated combustion. In the insulation damage may also occur on the shell at discharge and produce electric arc and spark, causing an insulating layer of fire.
Lubricating oil 4 motor bearing capacity insufficiency or lubricating oil is too dirty, will be stuck rotor makes the motor overheating, cause insulationcombustion.
Machinery for the production of 5 motor drive is stuck, make the motor seriousover current, causing the coil overheat and catch fire (superfine dry powder).
6 motor terminal point of contact is not good, the contact resistance is too large, high temperature and spark generated during the operation, caused bycombustible insulation or near combustion.
The 7 motor repair bad, the ventilation slot is dust or fibers jam, heat is not out, causing the coil overheat and fire.
Preventive measures:
1 Selection and installation to comply with fire safety requirements of electric motor. In damp, dust places should choose enclosed motor; in dry and cleanplace can choose the type of protection motor; should use explosion-proofmotor in flammable and explosive place.
The 2 motor should be installed in the fire (six fluorine propane) materials based on. Such as the installation based on combustible when should be covered with iron and other non burning material makes the motor and combustible base separated. The motor can not be installed in the combustiblestructure. The electric motor and the combustible should maintain certain distance, not piling up debris around.
The operation of the switch and short circuit protection, over load protectioneach motor 3 to have independent device. For the large capacity motor,installed phase lack protection or equipment indicator to monitor power in the motor, to prevent the motor phase deficient operation.
The 4 motor should always check the maintenance, cleaning timely keep clean; the lubricating oil to do a good job monitoring and timely supplement and replace the lubricating oil; to ensure the main brush complete, suitable pressure, good contact; on the motor operating temperature should strengthen the control, which does not exceed the specified value.
The 5 motor after use should be opened the motor power supply switch,immediately cut off the power supply, ensure that the motor and personal safety.
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