Academic literature on the topic 'Coaxial linear motor'

The design of an electric vibrator created on the basis of a linear motor with permanent magnets is considered, and the calculation of the magnetic field and the electromagnetic force acting on the motor armature is performed by the finite element method. The results of experimental studies confirming the reliability of the obtained calculated data are presented]. The purpose of this work is to study the distribution of the magnetic field and the electro-magnetic forces in a coaxial-linear permanent magnet electric motor (PM), which is the basis for the creation of avibration installationKeywords: vibration, magnets, magnetic induction, stator winding, electric vibrator

Based on the idea of integrated design, a drive-transmission integrated linear electromechanical actuator is developed. The actuator consists of a permanent magnet synchronous motor (PMSM), a ball-screw and shells. By using coaxial assemblage, the ball-screw is inserted into the hole of the hollow motor rotor and the nut of the ball-screw connects with the motor rotor. In order to restrict the ball-screw rotating relatively to the shell, splines machined respectively on ball-screw and the shell come into being a spline pair. A driver based on a DSP processor and IGBTs plus a position feedback resolver forms a precise servo system.

The traditional motorcycle meters are driven by the separate motors, these devices are simple and easy to be controlled, stable performance, but dial space has not been fully utilized. This paper introduces the double index show of motorcycle speed and speed，focus on analysis of dual-axis stepper motor driven connections, drive mode and the driver circuit design. The results of experiment and application shows that the coaxial two-pointer motorcycle display instrument has good repeatability, good linear scale, fast response, no jitter, high reliability and relatively small size and many other advantages, instrumentation stepper motor driver with dual-axis motor instrument design meet the relevant requirements of motorcycle meter, can be easily to achieve motor servo system driven synchronous control of double axis step-drive electromotor.

In more and more robotic applications, it is strongly desired that each actuator provides a wide range of speed, and has more capability to adapt to larger changes of load at the same time. In this paper, we discuss the proposal and development of a novel linear motion mechanism with load sensitive transmission, which consists of certain key components such as rubber rollers and flat springs. The developed mechanical model provides long stroke linear motion and has its ratio changed automatically in response to the continuously variable coaxial pressing load. This compact mechanism has the ability to absorb sudden coaxial load shock and is equipped with overload protection; it stops its advance if the load exceeds a certain value while the motor continues to rotate to keep it from overheating. Having the characteristics of light weight, compact dimensions, large ranges of load and speed, load sensitivity, and long stroke linear motion, it is expected that this mechanism can be used in linear moving robotic application in future.

We report analysis and measurements of the torque and flow of a ferrofluid in a cylindrical annulus subjected to a rotating magnetic field perpendicular to the cylinder axis. The presence of the inner cylinder results in a nonuniform magnetic field in the annulus. An asymptotic analysis of the ferrohydrodynamic torque and flow assuming linear magnetization and neglecting the effect of couple stresses indicated that the torque should have a linear dependence on field frequency and quadratic dependence on field amplitude. To the order of approximation of the analysis, no bulk flow is expected in the annular gap between stationary cylinders. Experiments measured the torque required to restrain a polycarbonate spindle surrounded by ferrofluid in a cylindrical container and subjected to the rotating magnetic field generated by a two-pole magnetic induction motor stator, as a function of the applied field amplitude and frequency, and for various values of the geometric aspect ratios of the problem. The ultrasound velocity profile method was used to measure the azimuthal and axial velocity profiles in the ferrofluid contained in the annular gap of the apparatus. Flow measurements show the existence of a bulk azimuthal ferrofluid flow between stationary coaxial cylinders with a negligible axial velocity component. The fluid was found to corotate with the applied magnetic field. Both the torque and flow measurements showed power-of-one dependence on frequency and amplitude of the applied magnetic field. This analysis and these experiments indicate that the action of antisymmetric stresses is responsible for the torque measured on the inner cylinder, whereas the effect of body couples is likely responsible for bulk motion of the ferrofluid.

AbstractIn this paper, a new design configuration has been proposed in which a prototype of resonant inductive power transfer-based contactless power transfer to wound rotor has been developed which provides field power to brushless alternating current (BLAC) or brushless direct current (BLDC) motors without the use of permanent magnets in the rotor. Further, wound field in the rotor of DC motor can be powered without carbon brushes. The proposed design facilitates motor performance improvement by adding an extra dimension of field flux control, while the armature circuit is conventionally fed from position detection and commutation schemes. It contains a primary multilayer concentrated coil fed with high-frequency resonating AC supply or switched mode supply. A single layer helical secondary coil coaxially fixed on the shaft receives high frequency wireless AC power transmitted from primary coil. Fast rectifier inside the hollow shaft and DC filter provides the transferred DC power to field terminals in the rotor. It has been verified that rotor power can be varied linearly with linear variation in input DC power with the highest efficiency at the resonant frequency. Available power to the rotor remains invariable with rotational speed and angle, which is a necessary requirement for rotor field. DC voltage on the rotor terminals can be effectively controlled during standstill as well as during rotation at any speed.

Диссертация на соискание учёной степени кандидата технических наук по специальности 05.09.01 – электрические машины и аппараты. – Национальный технический университет Украины "Харьковский политехнический институт" Харьков, 2016. Диссертация посвящена вопросам разработки и исследованию особенностей электромагнитных и электромеханических процессов коаксиально-линейных двигателей с аксиальным и радиальным вектором намагничивания постоянных магнитов для привода рабочего органа погружателя. Рассмотрены конструкции коаксиально-линейных двигателей с постоянными магнитами для привода рабочего органа погружателя строительных элементов и разработана математическая модель, а также методы расчета магнитной индукции, электромеханических и частотных характеристик при статическом и динамическом режимах работы вибрационного оборудования на основе коаксиально-линейных двигателей с аксиальным и радиальным вектором намагничивания постоянных магнитов. Предложена модель коаксиально-линейного двигателя с постоянными магнитами с аксиальным и радиальным вектором намагничивания постоянных магнитов в виде электрической схемы замещения и проведён сравнительный анализ векторных диаграмм напряжений и токов, позволяющий характеризовать энергетические параметры и рабочие характеристики при различных частотах напряжения. Разработан и изготовлен экспериментальный стенд для исследования статических и динамических характеристик коаксиально-линейных двигателей с постоянными магнитами. Проведённый анализ электромеханических характеристик коаксиально-линейных двигателей с постоянными магнитами показал, что при одинаковых параметрах жёсткости тяговых и ход-амперных характеристик более эффективным является двигатель с радиальным вектором намагничивания постоянных магнитов. На основе проведенных исследований коаксиально-линейных двигателей с аксиальным и радиальным вектором намагничивания постоянных магнитов с одинаковыми конструктивными параметрами статора и равными по массе магнитами и сравнение их электромагнитных, электромеханических и частотных характеристик, полученных при статическом и динамическом режимах работы двигателей, установлена целесообразность использования коаксиально-линейных двигателей с радиальным вектором намагничивания постоянных магнитов для привода рабочего органа погружателя строительных элементов.
The thesis for competition of the academic degree of candidate of technical sciences on the speciality 05.09.01 - electrical machines and apparatus. - The National Technical University "Kharkiv Polytechnic Institute" (NTU "KhPI"), Kharkiv, 2016. The thesis is devoted to the issues of development and study of the characteristics of magnetic and electromechanical processes in the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of immertor. The construction of coaxial linear motors with permanent magnets for drive of the working body of the immertor of building, models and methods of calculating the values of the parameters of electromagnetic induction, electromechanical and frequency characteristics under static and dynamic modes of vibration equipment with axial and radial magnetization vector of permanent magnets are researched. The experimental stand for removal of static and dynamic characteristics of coaxial linear motors with permanent magnets is developed and manufactured. The analysis of the effectiveness of using the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of the immertor of building elements with the same design parameters of stator and magnets equal in weight during the process of creating drives of vibrators based on comparison, obtained by static and dynamic modes.

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.09.01 – електричні машини й апарати. – Національний технічний університет України "Харківський політехнічний інститут", Харків, 2016. Дисертаційна робота присвячена питанням розробки та дослідження особливостей електромагнітних та електромеханічних процесів коаксіально-лінійних двигунів з аксіальним та радіальним вектором намагнічування постійних магнітів для привода робочого органу занурювача. Запропоновані конструкції коаксіально-лінійних двигунів з постійними магнітами для привода робочого органу занурювача будівельних елементів, а також методи розрахунку магнітної індукції, електромеханічних та частотних характеристик при статичному та динамічному режимах роботи вібраційного обладнання на основі коаксіально-лінійних двигунів з постійними магнітами. Розроблені та виготовлені експериментальні стенди для дослідження статичних та динамічних характеристик коаксіально-лінійних двигунів з постійними магнітами. На основі проведеного дослідження коаксіально-лінійних двигунів з аксіальним та радіальним вектором намагнічування постійних магнітів з однаковими конструктивними параметрами статора та рівними за масою магнітами та порівняння їх характеристик, отриманих при статичному та динамічному режимах роботи двигунів, встановлено доцільність використання коаксіально-лінійних двигунів з радіальним вектором намагнічування постійних магнітів для привода робочого органу занурювача будівельних елементів.
The thesis for competition of the academic degree of candidate of technical sciences on the speciality 05.09.01 - electrical machines and apparatus. - The National Technical University "Kharkiv Polytechnic Institute" (NTU "KhPI"), Kharkiv, 2016. The thesis is devoted to the issues of development and study of the characteristics of magnetic and electromechanical processes in the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of immertor. The construction of coaxial linear motors with permanent magnets for drive of the working body of the immertor of building, models and methods of calculating the values of the parameters of electromagnetic induction, electromechanical and frequency characteristics under static and dynamic modes of vibration equipment with axial and radial magnetization vector of permanent magnets are researched. The experimental stand for removal of static and dynamic characteristics of coaxial linear motors with permanent magnets is developed and manufactured. The analysis of the effectiveness of using the coaxial linear motors with axial and radial magnetization vector of permanent magnets for drive of the working body of the immertor of building elements with the same design parameters of stator and magnets equal in weight during the process of creating drives of vibrators based on comparison, obtained by static and dynamic modes.