The motor only consumes active power in watts as input and provides mechanical power in HP or kW at the motor shaft as output. The motor has a fixed power factor. The power factor is mentioned on the nameplate data of the motor.
The motor has a fixed power factor at its full load current. All the motor data- voltage, current, and power factor are given on the nameplate of the motor. The motor is designed to drive the mechanical load of a particular rating.
An electric motor is a machine that converts electrical power into mechanical power. In this case, the load is not electrical, but mechanical (Motor’s Output) and we take into account only active power which has to be converted into the mechanical load.
Moreover, the motor power factor does not depend on the load, and it works on any P.F. because of its design. Hence, Electric Motors are rated in kW and not in kVA.