3 phase motors

MrJack96:

I’ve got two questions regarding maintenance on motors. The first one is is there any hazards lubricating a motor in service I know obviously there will be mechanical safety to be aware of but electrical is there any issues. 


my second question is with motor overloads how bad for the motor is having a 1.8amp 10a overload on a motor with 1.75FLC I know it can still be overloaded by 50ma but is it a concern. 


thanks again guys! 

Greasing motor bearings is an art and a science. There should be no problem in greasing the bearings in service, actually this may help to distribute the grease inside the bearing. Do not over grease though, as this creates friction and heat and may damage the bearing by grease degradation. Some bearings should only be filled to a thirty per cent capacity. It is essential to use the correct viscosity  grease. Slow shafts need a heavier grease than faster rotating shafts. Consult the manufacturers of the machines. There are some good Youtube videos covering machine and motor lubrication.


Electric Motor Bearing Greasing and Lubrication (machinerylubrication.com)



Z.

MrJack96:

I’ve got two questions regarding maintenance on motors. The first one is is there any hazards lubricating a motor in service I know obviously there will be mechanical safety to be aware of but electrical is there any issues. 


my second question is with motor overloads how bad for the motor is having a 1.8amp 10a overload on a motor with 1.75FLC I know it can still be overloaded by 50ma but is it a concern. 


thanks again guys! 

Greasing motor bearings is an art and a science. There should be no problem in greasing the bearings in service, actually this may help to distribute the grease inside the bearing. Do not over grease though, as this creates friction and heat and may damage the bearing by grease degradation. Some bearings should only be filled to a thirty per cent capacity. It is essential to use the correct viscosity  grease. Slow shafts need a heavier grease than faster rotating shafts. Consult the manufacturers of the machines. There are some good Youtube videos covering machine and motor lubrication.


Electric Motor Bearing Greasing and Lubrication (machinerylubrication.com)



Z.