16 uppsatser · sida 1 av 2
… is based on VSC (Voltage Source Converter) that uses a technique called PWM (Pulse Width Modulation). There are a lot of PWM patterns that have been examined, but not in the field of power transmission where ABB Power Systems is working. The different PWM patterns can be used …
… work contains a litterature study about electrical motors in general and how PWM-patterns for brushless DC-motors can be made. A suitable method has been implemented as a simulation model in VHDL. A simulation model of a brushless DC-motor which describes the phasecurrents …
I detta examensarbete har metoder för design av en FPGA-baserad PCM-till-PWM-modulator för klass D-audioförstärkare testats och utvärderats. Rapporten diskuterar med stöd av matematisk analys och simuleringar interpoleringsmetoder, pulsbreddsmodulering, samplingsprocesser och …
… with a triangle wave and as a out signal produce a pulse width modulated (PWM) signal. The report is also a review and evaluating of two different modulating technologies, AD- modeling and BD-modeling. A detailed part about how the H-bridge was designed and how it works. The …
… The amplifier that has been designed is of class D type with digital PWM modulator. There is several types of amplifier modules on the market that use analog input signal, but if one of them would be used a D-A converter is needed on the DSP card. The resultate of this thesis is …
… and PC software of the demonstrator has been programmed to be able to send out PWM signals that control the dispensers. An adapter card was designed to control the piezoelectric membrane and a steering link to the electrostatic atomization has been developed for PWM signals up …
… utvecklingskortet för motorstyrningar. Detta innefattar implementationer av PWM, mikrostegningstyrning samt motorstyrning med hjälp av fullsteg och halvsteg.
… to get the platform flying. It touches on subjects such as A/D-conversion. PWM-control and PID-control. The sensors used in the platform are a gyro and an accelerometer. The platform is controlled from a ground station through a wireless link. The wireless link is an Xbee-module …
… och försetts med antialiasfilter. Simuleringar har visat att den PWM-signal som styr strömmen till elektromagneterna och därmed styr magnetfältets styrka måste kunna ändras med minst 1kHz. Samplingsfrekvensen är det främsta kravet för val av processor. Den ström som måste kunna …
… wave with a varied frequency. The signal converts via the software to become a PWM-signal that has a fixed frequency. A low pass filter and a differential amplifier make the signal meet the interface of AK95S. Results from the report shows that the adapting method can work. Some …
Denna högskoleavhandling beskriver konstruktionen av ett system vars funktion är att PID-reglera ett linjärställdon kopplad till venturi. Syftet har varit att få fram en reglering på venturin så att förutsättningarna förblir desamma vid mätning av olika temperaturer och …
… har sketti form av en robot med ett för uppgiften specialbyggt styrsystem, PWM ? styrning av enpermanentmagnetmotor och en egenkonstruerad manöverdosa.
Denna rapport behandlar utveckling av en tvåhjulig balanserande robot. En PID-regulator är implementerad i en mikrokontroller, som även AD-omvandlar en sensorsignal, samt styr motorer via H-bryggor med pulsbreddsmodulering. I rapporten förklaras framtagning av diskret …
Skumming i industritvätt
… to get the platform flying. It touches on subjects such as A/D-conversion. PWM-control and PID-control. The sensors used in the platform are a gyro and an accelerometer. The platform is controlled from a ground station through a wireless link. The wireless link is an Xbee-module …
… important areas of the course including rectifying, buck-/boost-converters and PWM-modulation. It is built as one sealed unit where all the electronics are built-in but visible and it has a connection board where students safely can connect the different circuits. The project …
