Iron loss calculation model of high-voltage multi-pole asynchronous motors considering high harmonic flux density

A variable coefficient segmented iron loss calculation model is proposed for high-voltage multi-pole asynchronous motors, which fully considers the influence of high-order harmonic magnetic density on such motors. This model introduces additional hysteresis loss, improved eddy current loss coefficients, and rotation magnetisation coefficients to account for changes in losses due to small hysteresis loops and skin effect, as well as rotation magnetisation losses. A 710 kW 10-pole asynchronous motor is used as the research object. A full-domain iron loss calculation model considering stator and rotor tooth top surface losses is developed. The model can be used to accurately calculate the overall and local harmonic iron losses in the stator and rotor cores of high-voltage multi-pole asynchronous motors. And quantitatively analyse the distribution pattern of any harmonic iron loss at any location in the motor core. It realises the refinement calculation and analysis of iron losses in the whole domain of high-voltage multi-pole asynchronous motor. Finally, no-load and load tests were conducted on the 710 kW 10-pole asynchronous motor. The iron losses of the 710 kW 10-pole asynchronous motor at no load and load are calculated using the above mentioned model and the classical trinomial constant factor model. The results are compared with the measured iron loss values. It is proved that the iron loss model is more accurate in calculating the iron loss of high-voltage multi-pole asynchronous motor. The result helps researchers to calculate the iron loss distribution of high voltage motors more accurately. Thus, the design and operating parameters of the motor can be optimised to improve the efficiency and performance of the motor. It provides the necessary technical support and key basis for the reduction of loss and energy saving of high-voltage motors and the optimisation of their core structure.