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Сборник докладов международной научно техической конференции 21

INCREASING THE CONSTRUCTION MECHANICAL STRENGTH OF AC CONVERTER-FED ELECTRIC MOTORS WITH AN AXIAL MAGNETIC FLUX USING DIGITAL MODELS
Keywords: AC converter-FED motor, synchronous machine, permanent magnets rotor, resonant frequencies, finite element method, axial electric motor. Introduction

INCREASING THE CONSTRUCTION MECHANICAL STRENGTH OF AC
CONVERTER-FED ELECTRIC MOTORS WITH AN AXIAL MAGNETIC FLUX
USING DIGITAL MODELS
Pauliukavets Siarhei Anatolievich
, Ph.D., associate professor,
Radkevich Artsiom
Andreevich
, master student, Belarusian National Technical University, Minsk, Republic
of Belarus

Abstract:
The influence of resonant frequencies on the construstion mechanical
strength of AC synchronous electric motor with an axial magnetic flux and a permanent
magnet rotor was analyzed. A digital three-dimensional model of the electric motor was
constructed, on the basis of which a study of the dynamic load of the motor structure was
carried out using the finite element method (FEM). The values of resonant frequencies at
which the construction is deformed were determined, and sections of the structure with
the greatest influence of resonant frequencies were identified.
Keywords:
AC converter-FED motor, synchronous machine, permanent magnets
rotor, resonant frequencies, finite element method, axial electric motor.
Introduction
The invention of neodymium magnets provided the starting point for the
development of axial flux permanent magnet (AFPM) motors, which have been the
subject of research for the past 20 years. Axial flux motors have a high torque-to-weight
ratio, improved heat dissipation for cooling, low weight, high power density and high
torque [1], making them promising for many applications.
Axial flux permanent magnet motors with a coreless stator are considered highly
efficient machines due to the absence of core losses and can potentially operate at higher
efficiency than traditional electric motors. In addition to the advantages associated with
the use of permanent magnets with axial flux, AFPM electric motors have several other
advantages, such as high torque-to-weight ratio, higher power density, higher efficiency
and more compact structure [2]. These properties of brushless motors with a permanent
magnets rotor have determined their distribution in wind power plants, electric vehicle
wheel motors, hybrid vehicles and robotics.
To date, there have been a number of studies on axial flux motors [2], [3], which are
focused on the study of motor designs with a toroidal stator with slots (TAFPM-S), as
well as toroidal stator designs without slots (TAFPM-NC) motors with constant axial
flow. Motors of the TAFPM-S type are the most studied type of axial motors [2]. Their
characteristics are characterized by high specific power and torque. Their disadvantages
include high torque from cog harmonic field interference and pulsating torque [4].
One of the main problems with axial flux core motors is the presence of significant
gear torque in the stator since the rotor and stator face each other and a larger surface area
of the magnets is exposed to the magnetic field of the stator core compared to other types
of DC motors [3]. Therefore, reducing gear torque is necessary to improve the overall
efficiency of AFPM motors. Brushless synchronous motors of the TAFPM-NC type have

МЕЖДУНАРОДНАЯ НАУЧНО-ТЕХНИЧЕСКАЯ КОНФЕРЕНЦИЯ
АКТУАЛЬНЫЕ ПРОБЛЕМЫ ЦИФРОВИЗАЦИИ ЭЛЕКТРОМЕХАНИЧЕСКИХ И
ЭЛЕКТРОТЕХНОЛОГИЧЕСКИХ СИСТЕМ
157
the best application prospects due to the low cost of their production and the absence of
torque from tooth harmonic field interference [3].
With all the advantages of brushless motors with a toroidal stator and axial
magnetic flux distribution, their energy efficiency can be increased by using a coreless
stator design. Initially [5], the first samples of axial magnetic flux motors had coreless
stators and consisted of diamond-shaped copper windings with nine turns per coil and had
an EMF of almost sinusoidal shape.
Coreless permanent magnet axial flux motors have a special disk type design with a
coreless stator located between two rotors. Because of this, they are lighter and more
efficient since losses in the stator core are eliminated [5]. However, since the stator
windings are exposed to a time-varying magnetic field, eddy current losses in the
conductors can be significant, especially if the motors operate at high frequencies.
Therefore, to reduce losses in the windings of coreless motors, special Litz wires are
used.

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