There are numerous bearing suppliers and the best of them have bearing selection guides that you can download or get as a pamphlet.
In short, you should know or learn for your particular motor..
Speed
Reaction forces from the driven load
Reaction force from rotor unbalance
Reaction force from rotor magnetic unbalance
Operation environment
Load duty cycle and shock loads
bearing assembly
The type of bearing that would be fitted to a fractional kW electric motor will depend on the model and maker of the motor. Deep grove ball bearings are the most common bearings used.
You didn't say what type of motor. If an electric motor it could be the shaft bearing(s) are worn.
The electric motor changes electric energy into mechanical energy.
An electric motor
electric energy to mechanical energy
I have not worked on this particular electric motor, but I have replaced bearings on a furnace fan motor. The furnace motor had bronze sleeve type bearings. A replacement was found at a local hardware store that had a large selection of fasteners, etc in sliding trays. The standard size sleeve bearing that was available matched the ID and OD of the motor bearing, but was longer, so I had to cut it to match the length. Then carefully press out the old bearing and press in the new one, and lubricate with sae 20 machine oil periodically.
Because that is the purpose on an electric motor.
Electric motor.
the voltage tolerance of a standard electric motor is
An electric motor can power anything that needs mechanical torque.
An electric motor converts electrical energy to kinetic energy.