Control strategy for switched reluctance motor with rotary encoder based rotor position detection

Development of electric drive tends to the use of Switched Reluctance Motor (SRM) for their advantages and green technology issues. The SRM takes significant place in development for its simplicity, robust construction, and low cost. Sensorless method can be applied to drive SRM, it is less expansive but has more complexity and limitation. On the other hand, although sensor-based rotor position detection needs a hardware assembled on the shaft, some advantages can be obtained. In this paper, a control strategy for SRM drive with rotary encoder based rotor position detection is proposed, core of the strategy implements digital signal controller. The problem associated with wide range speed and standstill operation can be overcome by this strategy. This is also capable to vary the time to turn the switches on and off by software. The analysis was verified by simulations and experiments

Performance characterisation of a new photo-microsensor based sensing head for displacement measurement

This paper presents a robust displacement sensor with nanometre-scale resolution over a micrometre range. It is composed of low cost commercially available slotted photo-microsensors (SPMs). The displacement sensor is designed with a particular arrangement of a compact array of SPMs with specially designed shutter assembly and signal processing to significantly reduce sensitivity to ambient light, input voltage variation, circuit electronics drift, etc. The sensor principle and the characterisation results are described in this paper. The proposed prototype sensor has a linear measurement range of 20 μm and resolution of 21 nm. This kind of sensor has several potential applications, including mechanical structural deformation monitoring system

Design and Characterization of Tri-axis Soft Inductive Tactile Sensors

Tactile sensors are essential for robotic systems to safely and effectively interact with the environment and humans. In particular, tri-axis tactile sensors are crucial for dexterous robotic manipulations by providing shear force, slip or contact angle information. The Soft Inductive Tactile Sensor (SITS) is a new type of tactile sensor that measures inductance variations caused by eddy-current effect. In this paper, we present a soft tri-axis tactile sensor using the configuration of four planar coils and a single conductive film with hyperelastic material in between them. The working principle is explained and design methods are outlined. A 3D finite element model was developed to characterize the tri-axis SITS and to optimize the target design through parameter study. Prototypes were fabricated, characterized and calibrated, and a force measurement resolution of 0.3 mN is achieved in each axis. Demonstrations show that the sensor can clearly measure light touch (a few mN normal force) and shear force pulses (10 to 30 mN) produced by a serrated leaf when it is moved across the sensor surface. The presented sensor is low cost, high performance, robust, durable, and easily customizable for a variety of robotic and healthcare applications

Аналоговий інтерфейс індуктивного датчика переміщення

In the following article we describe interface for analog inductive displacement sensor and possible scope of its application (both aviation industry and civil domestic production taking rotary washing machines as example). The is also an there's overview of main sources of destruction and failure of rotary washing machines, advantages and disadvantages of inductive sensors of movement and embodiment of such a sensor. Also presented a graphic model as a result of research of a sensor.В статье описаны датчики перемещения и важность измерения перемещения как в авиационной промышленности, так и в гражданской. В первой части статьи акцент сделан на гражданском применении описываемых датчиков как наиболее показательном. В рамках этой части статьи рассмотрены различные типы стиральных машин, важность контроля различных параметров в них и возможные результаты поломки таких машин. Также рассмотрены современные датчики перемещения в этой сфере, преимущества и недостатки современных решений, возможности развития новых типов датчиков и соответствующих аналоговых интерфейсов. Предложен новый аналоговый интерфейс вместе с индуктивным датчиком перемещения. Описание, схема, график исходящего сигнала и формула подкрепляют предложенное решение. На основании приведенной информации сделаны положительные выводы относительно возможности применения предложенной схемы.У статті описано датчики переміщення та важливість вимірювання переміщення як у авіаційній промисловості, так і у цивільній. У першій частині статті зроблено акцент на цивільному застосуванні описуваних датчиків як найбільш показовому. У межах цієї частини статті розглянуто різні типи пральних машин, важливість контролю різних параметрів у них та можливі результати поломок таких машин. Також оглянуто сучасні датчики переміщення у цій сфері, переваги та недоліки сучасних рішень, можливості для розвитку нових типів датчиків та відповідних аналогових інтерфейсів. Запропоновано новий аналоговий інтерфейс разом із індуктивним датчиком переміщення. Опис, схема, графік вихідного сигналу та формула підкріплюють запропоноване рішення. На основі наведеної інформації зроблені позитивні висновки щодо можливості корисного застосування запропонованої схеми

Pedaling and Braking Forces and Their Effect on Suspension Performance

The goal of this project is to produce a quantifiable relationship between pedaling and braking forces and suspension behavior. The test results will serve as a benchmark, against which other suspension designs can be compared in an objective, numerical manner. This report details the work completed towards determining this relationship and is primarily focused on design development of the data acquisition system and analysis of braking forces, pedaling forces and suspension response. A 2011 Specialized Stumpjumper FSR Expert Evo was used as the development platform. The system will be used to measure various rear suspension designs for comparison

Wireless Power Transfer

Wireless power transfer techniques have been gaining researchers' and industry attention due to the increasing number of battery-powered devices, such as mobile computers, mobile phones, smart devices, intelligent sensors, mainly as a way to replace the standard cable charging, but also for powering battery-less equipment. The storage capacity of batteries is an extremely important element of how a device can be used. If we talk about battery-powered electronic equipment, the autonomy is one factor that may be essential in choosing a device or another, making the solution of remote powering very attractive. A distinction has to be made between the two forms of wireless power transmission, as seen in terms of how the transmitted energy is used at the receiving point: - Transmission of information or data, when it is essential for an amount of energy to reach the receiver to restore the transmitted information; - Transmission of electric energy in the form of electromagnetic field, when the energy transfer efficiency is essential, the power being used to energize the receiving equipment. The second form of energy transfer is the subject of this book

A Closed-loop capacitance to pulse-width converter for single element capacitive sensors

A novel closed-loop capacitance-to-pulse width converter (CPC) suitable for single element capacitive sensors that use sinusoidal excitation is presented in this paper. Its operation is realized using a new configuration based on a simple, yet effective, auto-balancing scheme. The hardware prototype of the proposed CPC is relatively less complex to implement than those presented so far in the literature. It provides a quasi-digital output at a high update rate. Additionally, the output is insensitive to parasitic capacitances of the sensor. The output possesses high linearity, with respect to change in the sensor capacitance, ranging +/-5 pF, with a nominal capacitance as high as 200 pF. It exhibits a maximum non-linearity error of 0.061%FS. The output of the prototype has a resolution of 13.31 bits. Also, its response time for a step-change in the sensor capacitance is about 13 ms. This sophisticated and inexpensive closed-loop CPC is a perfect fit as an interfacing circuit for single element capacitive sensors.Peer ReviewedPostprint (author's final draft

Development of a control circuit for a radial active magnetic bearing

The electromagnetic bearings are the result of the modern control technique. Utilizing this principle frictionless bearing is reachable, but an appropriate control circuit is needed. In this report a development of an analogue PID controller will be demonstrated