I have seen the specifications of the LA052-080E3NL1 Shinano motor


when it is mentioned as the rated current is it at input side / battery current or phase current?

 

What phase current? It appears to be a DC motor.

 

It is BLDC motor.

 

My understanding is since the specifications are given by the motor it shall be that of the phase currents that the windings can handle, since it is rated current it will be the RMS value of the phase current.

 

"RATED CURRENT" for a motor is usually understood to the current from an external source connected to the motor's power input connection, usually with the motor delivering the rated torque or the rated power (horsepower), or Watts.
DISHONEST advertisers may claim the peak power that a motor can deliver for a short time, often for one revolution.

 

Just one further clarification is it possible to calculate the battery current from the motor current?

 

Revisit post #5, please. "Rated current" IS the input current to the motor. So if that is the only load on the battery, it would equal the battery current. The various current levels inside a motor are seldom available for convenient measurement in a user application.
"Rated Current" is the value presented to the user that the motor will require to be supplied for the full rated output power.

 

There is a wealth of information out there; on BLDC control.
https://www.mathworks.com/discovery/bldc-motor-control.html
You will need a suitable BLDC controller, to commutate the motor this way via the three rotor sensors.

 

BTW, that motor appears to be made for servo use, it also has an incremental position encoder !

 

The practical value of a motor current rating is to inform as to what will be required to power that motor to deliver it's rated power. The required power from the motor is determined by the specific application. THAT determination can be quite tedious. Lots of math and quite a few measurements.