Control system of a tractive drive with temperature control of thermally loaded elements

IOP Conf. Ser.: Earth Environ. Sci.

Kosmodamianskii

2017

Abstract. The relevance of thermal behavior investigation of traction induction motors is shown. The brief survey of techniques to monitor the temperature of an induction motors is carried out. The detailed multi-node equivalent thermal circuit of an induction motor is designed for steady state. The calculation technique of some units' thermal resistances by using of construction features and geometric sizes of an induction motor is shown. Results of thermal processes calculation for 14 kWAO-63-4 induction motor are shown. The adequacy of proposed thermal model is proved by means of good convergence of calculated results with the results obtained by the experimental investigation on the same induction motor. As a result of investigation, it is established that the slot winding of the stator located about on 2/3 of its length from the cooling air entrance has the highest value of temperature. IntroductionDifferent researches dedicated to induction motor electric drives show that the thermal conditions of the motor affect both motor reliability and performance of the control systems [1,2]. The windings temperature is established to defy lifetime insulation; it is one of a main factors causing an insulation aging [3]. So, it was found by V.M. Montsinger [4] that the degradation speed of winding insulation doubles at 8 degree rising over the maximum operating temperature. Moreover, the windings temperature changing leads to the quality derating of the control systems [5]. It concerns, first of all, the complex control systems, such as vector control and direct torque control systems, in which the accuracy of speed control depends on accuracy of the stator and rotor resistance identification. Also, the temperature changing affects the efficiency of an electric drive. It becomes crucial for drives with control systems providing the minimum of power losses. To overcome or mitigate the temperature influence, the control systems have to have the correct data about actual temperature in real time. This problem has essential meaning in traction electric drives where thermal condition of electric drives is harder predictable due to a peculiarity of operation mode. So, regardless of exact traction application, i.e. railway or mining railway locomotives, the traction induction motors operate, mostly, with high torques and low speeds that causes the higher thermal stresses on the motor windings. The other factor to influence complexity of thermal state of the traction motor is a cooling system set, in many cases, separately from the actual thermal condition. In some part of general and mine locomotives park, the auxiliary motors driving the cooling fans and pumps are supplied directly from the sinchronous

Section: Equivalent Thermal Circuit Of Induction Motormentioning

confidence: 99%

“…Different researches dedicated to induction motor electric drives show that the thermal conditions of the motor affect both motor reliability and performance of the control systems [1,2]. The windings temperature is established to defy lifetime insulation; it is one of a main factors causing an insulation aging [3].…”

Section: Introductionmentioning

confidence: 99%

Investigation of induction motor temperature distribution in traction applications

IOP Conf. Ser.: Earth Environ. Sci.

Kosmodamianskii

2017

“…Th ere are some hybrid techniques that combine peculiarities and advantages of three techniques mentioned above [1,9,5], but, nevertheless, it can be classifi ed by presented ones.…”

Section: Survey Of Effi Ciency Optimization Techniquesmentioning

confidence: 99%

“…Th e average power losses of frequency converter over switching period of time are determined by follow equations [9]:…”

Section: Overall Power Losses Model Of Induction Motor Drivementioning

confidence: 99%

Automatic Temperature Regulation System of Locomotive Traction Induction Motors With Power Losses Minimization

Kosmodamianskii

Vorobiev

2015

JITA

Self Cite

Abstract:The air cooling systems are shown to be used to provide required temperature condition of traction induction motors on locomotives. The automatic temperature regulation system is developed for its using to solve such a task. Results of experimental investigation showed that the AO63-4 induction motor stator end winding on the side opposite to air supply is the most heated part of the induction motor. Based on the results of the research, it was used an aperiodic second-order transfer function for approximation of the thermal transient curves. The design of an induction motor control system maintaining operating mode with minimum of the stator current are considered. It is shown that the modes of minimum of the stator current and minimum of power losses are quite close to each other. The MatLab simulation results taking typical nonlinearities and iron power losses in an induction motor and conduction and commutation power losses in semiconductors of frequency converter into account are presented. It is shown that as a result of application of the suggested system the power losses reduction may be led up to 20 % relatively to classical scalar control.

“…The survey of locomotives used in the Russian railway shows that the induction motors of cooling fans are either controlled discretely or not controlled at all [3]. Meanwhile, the greatest effect in solving the problem of increasing the efficiency of cooling systems and providing the required temperature of semiconductor devices of a frequency converter can be achieved if the cooling systems will be equipped with controlled drive fans, allowing continuous and automatic change of cooling air or liquid depending on the temperature of the IGBT and diode junctions.…”

Section: Introductionmentioning

confidence: 99%

Temperature control of power semiconductor devices in traction applications

IOP Conf. Ser.: Mater. Sci. Eng.

Strekalov

2017

Abstract. The peculiarity of thermal management of traction frequency converters of a railway rolling stock is highlighted. The topology and the operation principle of the automatic temperature control system of power semiconductor modules of the traction frequency converter are designed and discussed. The features of semiconductors as an object of temperature control are considered; the equivalent circuit of thermal processes in the semiconductors is suggested, the power losses in the two-level voltage source inverters are evaluated and analyzed. The dynamic properties and characteristics of the cooling fan induction motor electric drive with the scalar control are presented. The results of simulation in Matlab are shown for the steady state of thermal processes.