|
|
Design of high speed induction motor
Čech, Jiří ; Knebl, Ladislav (referee) ; Ondrůšek, Čestmír (advisor)
The first part of this paper presents general information about electromagnetic designing of an induction motor. Focus is on explanation of individual designing aspects and their effects on final motor parametres. Design principles for magnetic cores, slot dimensioning, stator winding and rotor squirrel cage are presented. Second chapter presents complete analytical computation of a given induction motor. Firstly several parametres need to be selected. Then sizing of stator and rotor is conducted. Secondly steady state equivalent parametres and related operating characteristics are computed. Following chapter consinsts of three final designs. In the last chapter results of mechanical analysis are presented.
|
|
|
The Influence of Temperature to Change Operational Parameters and Lifetime of Powerful LEDs
Zeman, Milan ; Pavelka, Tomáš (referee) ; Krbal, Michal (advisor)
The aim of this bachelor’s thesis is the introduction of changes in operating parameters and lifetime period of LED module. The theoretical part is dedicated to a principle of light, the development and use of LED. The main emphasis is placed on PN junction degradation due to temperature and lifetime period of the LED module. The practical part of this thesis contains measuring of LED diode Cree XLamp XR-E in the course of temperature from 0°C to 90°C in the current range of 0-300% of nominal value. Efficiency of LED operation is highly dependent on PN junction temperature. When powering the LED to approximately 65% of the rated power, the conversion of electric energy to light is the most efficient. It depends on junction temperature because increasing temperature decreases efficiency. A very important factor when designing the lighting system is cooling which helps to dissipate heat from the chip.
|
|
|
Design of high speed induction motor
Čech, Jiří ; Knebl, Ladislav (referee) ; Ondrůšek, Čestmír (advisor)
The first part of this paper presents general information about electromagnetic designing of an induction motor. Focus is on explanation of individual designing aspects and their effects on final motor parametres. Design principles for magnetic cores, slot dimensioning, stator winding and rotor squirrel cage are presented. Second chapter presents complete analytical computation of a given induction motor. Firstly several parametres need to be selected. Then sizing of stator and rotor is conducted. Secondly steady state equivalent parametres and related operating characteristics are computed. Following chapter consinsts of three final designs. In the last chapter results of mechanical analysis are presented.
|
|
|
The Influence of Temperature to Change Operational Parameters and Lifetime of Powerful LEDs
Zeman, Milan ; Pavelka, Tomáš (referee) ; Krbal, Michal (advisor)
The aim of this bachelor’s thesis is the introduction of changes in operating parameters and lifetime period of LED module. The theoretical part is dedicated to a principle of light, the development and use of LED. The main emphasis is placed on PN junction degradation due to temperature and lifetime period of the LED module. The practical part of this thesis contains measuring of LED diode Cree XLamp XR-E in the course of temperature from 0°C to 90°C in the current range of 0-300% of nominal value. Efficiency of LED operation is highly dependent on PN junction temperature. When powering the LED to approximately 65% of the rated power, the conversion of electric energy to light is the most efficient. It depends on junction temperature because increasing temperature decreases efficiency. A very important factor when designing the lighting system is cooling which helps to dissipate heat from the chip.
|
|
| |
guest ::
