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The units for torque, as you stated, are Newton-meters. Although this is algebraically the same units as Joules, Joules are generally not appropriate units for torque.
In fact kg are a mass and not a force BUT kg are sloppily used as a force in many cases. Other torque units include foot-pound, Newton-metre, dyne-centimeter (!) ... In your case 3 kg.cm means that a force of 3 kg acting at a radius of 1 cm would produce the same amount of torque as your motor.Equally that could be 0.1 kg x 30 cm, or 10 kg x 0.3 cm or ... FWIW-kg is a unit of mass and Newton the corresponding unit of force.n fact kg are a mass and not a force BUT kg are sloppily used as a force in many cases. Other torque units include foot-pound, Newton-metre, dyne-centimeter (!) ... In your case 3 kg.cm means that a force of 3 kg acting at a radius of 1 cm would produce the same amount of torque as your motor.