Use of Thermal Network on Determining the Temperature Distribution Inside Electric Motors in Steady-State and Dynamic Conditions

Combined Model for Simulating the Effect of Transients on a Damaged Rotor Cage

“…Ref. [17] provides a further insight of thermal aspects involved in the design of an induction motor. A per-phase analytical circuit and two thermal network models are used to study the heating of a healthy rotor cage in stationary operation, but also during transients such as startup and stall conditions.…”

“…The effect of the fault's progression on the stator currents was fitted to a crack propagation model that allowed carrying out a prediction of the RUL of the bar once the fault had been detected at incipient level. Nevertheless, the requirements regarding a long, heavy cycling during the fatigue test imposed the selection of a small size machine, thus preventing the acquisition of the rotor magnitudes, as it is done in [17]. Therefore, although the driving mechanism behind the breakage was identified, a PoF model could not be established.…”

Experimental and numerical investigation of thermal field for a motor and related factors sensitivities using combined CFD-Taguchi method

“…Meng et al [3] and Wen et al [4] Claudio et al [5], Zhang et al [6,7], Bogumi et al [8], Yabiku et al [9], and Hirano et al [10] investigated the temperature rise of the motor by establishing the thermal network. Meng et al [3] and Wen et al [4] got the flow rate by building the wind network first.…”

Comparison of thermal stresses developed during transients on a damaged rotor cage

“…These temperature profiles feed a linear elastic solver that yields the stresses caused by the thermal expansion of the material given the structural constraints of the element. The input of the maximum stress in a S-N diagram provides the number of cycles the machine can withstand, which should exceed what is established in the standards [1]. Nevertheless, vibrations [2], pulsating loads [3] and cage imperfections [4] could alter such theoretical performance, decreasing the expected lifetime.…”

“…Following [1,7,8] and within the Condition-Based Maintenance and Prognostics and Health Management (CBM/PHM) architecture, [9] proposed a combined approach to simulate the effect of hot spots in the rotor cage by computing analytically the electromagnetic behavior of the motor and then reproducing the calculated currents in the cage on a 3D mesh representing half of the rotor. The yielded current distribution (only taking into account the resistances of the rotor elements) was used to obtain the heating and the temperature distribution, whilst thermal effects arising from magnetic phenomena were imposed on the mesh from independent analytical computations.…”