Thermal study of permanent magnet direct drive wheel motor

This work deals with thermal design of permanent magnet synchronous motor (PMSM). The designed motor is the in-wheel traction motor for automotive. The motor consist of an external rotor and inner stator with water cooling system. The thermal calculation is based on the simplified lumped parameters thermal model and is verified by the finite element methods FEM. The thermal simulation is made for the machine under various operating conditions of the car

Influence of production tolerances and production technologies on the temperature model of a high-speed synchronous machine with permanent magnets

The main aim of this paper is to prove the importance of precision of the manufacturing process during designing and producing the electrical machine. There is made a comparison of several models and shown the dependency on the accuracy of the dimension of the stator core and the contact region between the stator and motor housing. This paper is also focused on the modification and improvement of the passive cooling system of the high-speed electrical machines body. The contribution of the paper is the valuation of the inaccuracy of the prediction thermal calculation in comparison with a real electrical machine

Determinations of stator windings thermal model with various filling factor

The main part of this work deals with the description of the created mathematical model for calculating the magnitude of the thermal resistance of the stator slot winding of an electric machine. The given model is able to perform calculations for several different slot shapes. One of the mains input values of the calculation is the slot filling factor. The output values of the model are dependent at this factor and the total thermal resistance of the slot winding. At the end of this work is a comparison of the resulting values of the calculation and evaluation of the functionality of the mathematical model

Tuning of the thermal model of synchronous machine with PM by real measurement

This paper is dealing with the exact measurement and calculation of the equivalent thermal conduction coefficient between the winding and the slot. The main issue is how to describe and solve the thermal conduction coefficient on the handmade wired small machine with a low slot filling factor. There is a precise model of the machine created and valuated by the real measurement

Magnetic wheel optimization for undercarriage of self-acting robot

This paper deals with the dimensional and the material optimization of the robot magnetic wheel. A maximum value of the attracting force and the reduction of the weight are demanded. Three calculation techniques were used. The analytical solution shows conversion of the real wheel gap to a fictional constant gap and allows getting the total attracting force under some simplification. A numerical linear model respects dimension of the wheel exactly. Results are comparable with the precious technique. The last one technique is based on a non-linear model. It extends the linear model by accurate characteristics of the steel

Design of permanent magnet synchronous generator for a wide speed range

This paper deals with the design and testing of the independent permanent magnet synchronous generator (PMSG). Maximal speed of the generator is up to 1100 rpm, but the target of the design consists of the highest speed range where the required output power 200 W is achieved. It emphasizes especially the losses analysis and output current limits. The output voltage is rectified to the stabilized DC voltage which increases the power electronics requirements. The limits of the power electronic define the maximal output voltage of the generator

Different approach in thermal modeling of permanent magnet synchronous motor

This work deals with different methods of thermal modelling of the stator winding in a slot. The analyzed machine is a permanent magnet synchronous motor (PMSM). The simplified lumped thermal model and model parameters are described. The finite element methods model is set up by different definitions of the winding in a slot. The results of different thermal models of stator winding are shown and discussed

Coupled transient thermal analyses of passive cooling traction PMSM from the racing formula

This paper is focused on the transient thermal model of the Permanent Magnet Synchronous Motor (PMSM) and the airflow cooling model through the ribs in the stator lamination. The stator lamination has a new specialized designed shape. This type of lamination does not need a frame, and the lamination is directly cooled. It has reduced the thermal resistance between the cooling medium and stator lamination. The thermal model is loaded with variable Power, and the airflow speed of cooling air is variable. Thermal models are solved by software ANSYS CFX and Mechanical. The thermal model of PMSM is based on the traction motor. This machine is designed as enclosed. The modelled PMSM is used in the electric racing formula

Algorithm for creating of the equivalent thermal circuit for PMSM

Equivalent thermal circuit with lumped parameters is a frequently used method for thermal modeling of electrical machines. This paper presents an algorithm of the modular thermal model for the Permanent Magnet Synchronous Machine (PMSM). Modularity is achieved by separating geometry into sub-models, which allows easy introduction of different topologies into the calculations which leads to easier setting for modeled machines. First, used methods are introduced than algorithm realized in MATLAB interface is described step by step, at the end results and verification with FEM calculations are presented

Thermal and Ventilation Analysis of PMSG with a Radial External Fan

This article focuses on the thermal model of a synchronous generator with permanent magnets and external ventilation. The model was made in the commercial software Ansys Fluent. The model is validated by measuring a real machine. For this purpose, three heating tests with different cooling parameters were measured of which is only one presented. Due to the sufficient temperature reserve, the machine's nominal flow, half flow, and self-ventilation were chosen. The aim of the work was to tune the model to a numerical model and a real machine