IEC TS 60349-3 pdf download

IEC TS 60349-3 pdf download Electric traction – Rotating electrical machines for rail and road vehicles – Part 3: Determination of the total losses of converter-fed alternating current motors by summation of the component losses
3.2.1 .3 Losses supplied at other than the fundamental frequency The losses arising from the supply harmonics are the difference between the total and fundamental frequency power inputs to the motor when on load with the stator windings at approximately the temperature of reference. NOTE If the converter is a voltage source type and its modulation pattern is independent of load, the difference may be measured on no-load.
3.2.2 Synchronous motors
3.2.2.1 No-load losses supplied at the fundamental frequency The motor shall be driven on open circuit by a calibrated machine at the speed for which the losses are being determined and shall be excited by an independent source to generate the voltage shown on the specified characteristic at the same speed. The losses are equal to the mechanical power input to the motor shaft.
3.2.2.2 Load dependent losses supplied at the fundamental frequency The fundamental frequency I 2 R losses in the stator shall be calculated from the fundamental frequency current in each winding at the point for which the losses are being determined and from the measured resistance of the winding corrected to the temperature of reference.
Unless otherwise specified, the additional load losses shall be determined by driving the machine with the stator windings short-circuited at the speed of the point on the specified characteristic for which the losses are being determined. The excitation shall be adjusted to give the fundamental frequency stator winding currents for the same point. The losses shall be taken as the power supplied to the machine shaft minus the sum of the total stator I 2 R losses and the power supplied when the machine is driven unexcited at the same speed.
3.2.2.3 Losses supplied at other than the fundamental frequency The losses arising from the supply harmonics are the difference between the total and funda- mental frequency power inputs to the motor when on load with the windings at approximately the temperature of reference.
3.2.2.4 Loss in the excitation circuit
The loss in the excitation circuit shall be the product of the current in the winding and the total excitation voltage at the point for which the losses are being determined. The voltage shall be the value required to supply the excitation current with the winding at the temperature of reference. Account shall be taken of any ripple in the excitation current.