Rotor temperature estimation of squirrel cage induction motors by means of a combined scheme of parameter estimation and a thermal equivalent model

Kral, Christian; Habetler, T.G.; Harley, R.G.; Pirker, F.; Pascoli, G.; Oberguggenberger, Helmut; Fenz, C.-J.M.

doi:10.1109/iemdc.2003.1210346

Cited by 17 publications

(16 citation statements)

References 6 publications

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“…Nevertheless, the rotor temperatures may be critical in some practical application. In such cases it is then useful to monitor the rotor temperature through mathematical machine models [10].…”

Section: Simulation and Measurement Resultsmentioning

confidence: 99%

Design and Thermal Simulation of Induction Machines for Traction in Electric and Hybrid Electric Vehicles

Kral¹,

Haumer²,

Kapeller³

et al. 2007

WEVJ

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An electric traction machine for an electric or a hybrid electric vehicle is usually designed for a specific operating point or cycle. For such an operating point or cycle, the masses and the cooling circuit of the electric machine determine the time dependent temperature distribution within the machine. For a specific load cycle, the thermal simulation of the machine can reveal possible mass and size reductions for a given insulation class of the machine. In addition, such simulations allow the comparison of various cooling concepts. In the machine design process, the first step is a conventional electromagnetic machine design. From the geometric data of this design and the material properties, the parameters of a thermal equivalent circuit can be derived. The differential and algebraic equations of the thermal equivalent circuit are solved by a simulation tool to predict the temperatures of the critical parts in the electric machine. A thermal equivalent circuit is accurate enough to predict the thermal behavior of the critical parts in the electric machine, and yet not too complex, to obtain simulation results with moderate numerical effort. This enables an iterative design process to optimize the drive. MACHINE DESIGN PROCESSFor the machine to be designed, a certain operating point or cycle has to be specified. The specifications of such an operating point or cycle could be the nominal voltage, frequency and torque, or nominal torque and speed including a voltage/frequency characteristic of the power inverter. In some cases the overload characteristic during acceleration is specified, too. An additional criteria for the electric machine design is to keep the size of the machine, and therefore cost of material as low as possible. The size of the machine is thereby significantly determined by the thermal and electromagnetic utilization with respect to the insulation class.The electromagnetic design is based on the geometric data of the iron core and the windings of the stator and rotor [1,2] of the electric machine. For determining the main geometric data, an initial estimation is performed using some characteristic parameters and experimental knowledge. An electromagnetic calculation software then calculates the magnetic and electromechanical characteristics for the specified operating point or cycle of the induction machine. For this calculation, the non linear iron properties and the estimation of the stray fluxes have to be taken into account. As a result of the calculated magnetic circuit, the magnetic characteristic of the machine is obtained. Some geometric parameters can then be tuned to performed and optimize the electromagnetic utilization considering the actual operating point or cycle. From the geometric data and the material properties, the ohmic resis- * Arsenal Research, Giefinggasse 2, 1210 Vienna, Austria, email: christian.kral@arsenal.ac.at; anton.haumer@arsenal.ac.at; hansjoerg.kapeller@arsenal.ac.at; franz.pirker@arsenal.ac.at tances, the masses and the inertia can be determined.The electr...

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Section: Simulation and Measurement Resultsmentioning

confidence: 99%

Design and Thermal Simulation of Induction Machines for Traction in Electric and Hybrid Electric Vehicles

Kral¹,

Haumer²,

Kapeller³

et al. 2007

WEVJ

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show abstract

“…In the motor, maximum current was selected as meaningful current such as stating current, short current, controller maximum current. In this paper, starting current was selected to 42[A] by using the FEM [6].…”

Section: Introductionmentioning

confidence: 99%

The design of flux barrier for improvement of demagnetization endurance in BLDC Motor

Kim

Cho

Kim

et al. 2013

2013 International Conference on Electrical Machines and Systems (ICEMS)

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Generally, the motor inside vehicle is exposed to highly ambient temperature and large vibration according to repeatedly starting and stopping during very short time. So, in this paper, the rotor shape design was performed to improve demagnetization endurance by considering the starting current of the Brushless DC (BLDC) Motor through the Finite Element Method(FEM). As a result, the end of Permanent Magnets (PMs) in the basic model was occurring a partial irreversible demagnetization by starting current. To solve this problem, the installing flux barriers were limited to flux line on the core. Accordingly, demagnetization endurance and operating characteristics were improved.

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“…It is very important to monitor the rotor temperature online for the safe operation of the large and medium-sized motor [1] [2]. Due to the thermal effects of the winding current and internal eddy current, the motor would fever during the operation and the permanent-magnet motor temperature would rise, which might cause irreparable injury to the insulation of the winding and permanent-magnet material of the motor when serious cases, shorten the motor operating longevity, and generate detrimental effect on the safe operation of the power systems.…”

Section: Introductionmentioning

confidence: 99%

“…of a certain nonlinear dynamic system, estimate the model parameters of the linear dynamic unit and non-linear static gain, which should meet the minimum condition of the objective function expressed in(1).…”

mentioning

confidence: 99%

Notice of Violation of IEEE Publication Principles - Dynamic compensation for infrared thermometer based on Wiener model and particle swarm optimization algorithm

Tian

et al. 2009

2009 2nd IEEE International Conference on Computer Science and Information Technology

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A novel structure of dynamic model is proposed in this paper and applied to construct a dynamic model to correct the dynamic errors of the infrared thermometer, because of which the dynamic performance of the thermometer is effectively improved. The dynamic compensator is established and the compensation is described and explicated by the Wiener model. According to Wiener model, the novel structure is devised. The identification of thermometer non-linear dynamic compensator is achieved by particle swarm optimization algorithm. The results show that the stabilizing time of the thermometer is reduced less than 7 ms from 26 ms and the dynamic performance is obviously improved after compensation.

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Rotor temperature estimation of squirrel cage induction motors by means of a combined scheme of parameter estimation and a thermal equivalent model

Cited by 17 publications

References 6 publications

Design and Thermal Simulation of Induction Machines for Traction in Electric and Hybrid Electric Vehicles

Design and Thermal Simulation of Induction Machines for Traction in Electric and Hybrid Electric Vehicles

The design of flux barrier for improvement of demagnetization endurance in BLDC Motor

Notice of Violation of IEEE Publication Principles - Dynamic compensation for infrared thermometer based on Wiener model and particle swarm optimization algorithm

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