Temperature Calculation for Tubular Linear Motor by the Combination of Thermal Circuit and Temperature Field Method Considering the Linear Motion of Air Gap

There is a serious nonlinear between the sensitive parameters and the transmission capacity of the permanent magnet eddy current magnetic coupler (PMEC), and how to establish the accurate analytical model is very important to study its characteristics, optimize design and improve control accuracy. In order to solve the problem that the accuracy of analytical model deteriorates under the variable parameters of the PMEC, based on the electromagnetic-thermal theory, the electromagnetic-thermal nonlinearity of materials, such as the thermal effect of magnetic properties, the thermal effect of permeability, the thermal effect of conductivity, the magnetic saturation effect, the skin effect, the eddy current inductive reactance, have been deeply studied in this paper. On this basis, the multi-field coupling analytical model of the PMEC sensitive parameters and material electromagnetic thermal nonlinearity is established by using the magnetic equivalent circuit theory and lumped parameter thermal network method. Combined with numerical simulation and experiment, the research on electromagnetic characteristics, temperature characteristics and transmission characteristics of the PMEC are carried out. The comparative study shows that the proposed analytical model can accurately analyze the electromagnetic characteristics, temperature characteristics and transmission characteristics of the PMEC without any correction coefficient under different parameters. The accuracy of the analytical model with variable parameters is effectively solved, and the model theory of the PMEC is improved. The accurate analytical modeling method has laid theoretical foundation for the rapid optimization design and wide application of the PMEC.

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“…The convection heat resistance R1-7-1, R4-7, R5-7-1, R3-6, R2-3 and R3-4 are calculated as follows [32]…”

Section: Study On Temperature Characteristics Of the Pmecmentioning

confidence: 99%

An Improved Analytical Model of Permanent Magnet Eddy Current Magnetic Coupler Based on Electromagnetic-Thermal Coupling

2020

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“…The methods for determining the resistance of linear solenoids (motors) can be divided into two main categories: through thermal analyses [7], [19][20], [28][29][30][31] and from an electrical model [3][4], [33][34]. In the former case, the thermal state inside the actuator is obtained; thus, the resistance of the coil can be computed.…”

Section: Introductionmentioning

confidence: 99%

“…In the former case, the thermal state inside the actuator is obtained; thus, the resistance of the coil can be computed. Considering a linear actuator, the necessary thermal model is obtained by lumped parameter thermal network in [7], [19][20], [28][29] and by (multiphysics) FE (finite element) simulations in [30]. An extended survey on the evolution and on the modern approaches in the thermal analysis of electrical machines is presented in [31].…”

Section: Introductionmentioning

confidence: 99%

Parameter Estimation in Linear Electromagnetic Devices

Dülk

Kovácsházy

2014

IEEE Trans. Ind. Electron.

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The parameters of electrical machines can change considerably during operation due to thermal effects. Therefore, the corresponding models and the estimates of parameters can be subject to a significant bias and uncertainty, which degrade the performance of the system. In this paper, a method is developed to estimate the resistance of the coil of a linear electromagnetic actuator, i.e., of a single coil linear solenoid. In the electrical model of the solenoid actuator, the inductance depends on the current. The inductance is identified from the transient waveform of the current (step response); and an estimate of the resistance is provided by extrapolating to the steady-state of the current. Thus, the resistance can be estimated before the system reaches the steady-state. The presented method is generalized to PWM drive conditions by considering the average of the current of the coil in the successive PWM cycles. This improves the suppression of measurement noise. The developed approach is demonstrated through numerical and experimental analyses.

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“…Combining magnetic reluctance model and thermal resistance network (TRN) model, the non-linearity characteristic of electric machines during healthy and faulty conditions were modelled in [5]. Taking advantages of the flexibility of the thermal circuit method and the accuracy of the temperature field method, the transient temperature-rise of a tubular linear motor with short and movable primary was discussed in [6]. The efficiency of an off-the-shelf 4-kW three-phase line-start permanent-magnet machine (LSPMM) was evaluated as a function of the temperature by both the TRN and practical measurements in [7].…”

Section: Introductionmentioning

confidence: 99%

Thermal model of totally enclosed water-cooled permanent magnet synchronous machines for electric vehicle applications

Zhang

et al. 2014

2014 International Conference on Electrical Machines (ICEM)

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Totally enclosed water-cooled permanent magnet machines (TEWCPMMs) have been widely applied in electric vehicles (EVs) due to its advantages of high torque density, high power factor and strong overloading capacity. However, the TEWCPMM is often experienced with extremely high ambient temperature in very limited space, which may lead to serious machine faults. In order to investigate thermal performance deeply, after investigation on the air convection within the end-space, this paper presents a thermal model, which takes the influence of the air temperature within the end-space on the temperature distribution by convection into consideration. Combining electromagnetic finite-element analysis (FEA) with thermal resistance network (TRN) of the TEWCPMM, the thermal model is established, which is based on the law of heat flux balance in two continuous iterative calculations. Finally, experiments are performed on a 36-kW prototype to validate the proposed thermal model.Index Terms--Convection heat transfer, electric vehicles (EVs), finite-element analysis (FEA), thermal contact resistance, thermal resistance network (TRN), totally enclosed water-cooled permanent magnet machines (TEWCPMMs).

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Temperature Calculation for Tubular Linear Motor by the Combination of Thermal Circuit and Temperature Field Method Considering the Linear Motion of Air Gap

Cited by 45 publications

References 25 publications

An Improved Analytical Model of Permanent Magnet Eddy Current Magnetic Coupler Based on Electromagnetic-Thermal Coupling

An Improved Analytical Model of Permanent Magnet Eddy Current Magnetic Coupler Based on Electromagnetic-Thermal Coupling

Parameter Estimation in Linear Electromagnetic Devices

Thermal model of totally enclosed water-cooled permanent magnet synchronous machines for electric vehicle applications

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