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Calculation of optimum slip frequency of induction motor for minimisation of its losses
Bednařík, Václav ; Patočka, Miroslav (referee) ; Vorel, Pavel (advisor)
This master’s thesis focuses on the minimisation of losses by calculation of optimum slip frequency of induction motor. The next point of this master‘s thesis is supersaturation. Supersaturation must be solved for the size of losses, because of the effect that is cause of the losses, when current increases with saturation. However current is not increase proportionally with increasing saturation, but increases several times more. This problem is included in the calculation of the slip frequency. Optimum of slip frequency is solve for modified gamma model of induction machine. In the main point of this thesis is outlined the process, how the optimum can be found. With same process were already were found the equations, but they were too extensit. In the end is solved the optimum of slip frequency be minimum of the flux density.
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Operation of induction motor with respect to maximum efficiency
Čech, Jiří ; Ctibor, Jiří (referee) ; Toman, Marek (advisor)
In the first part of this paper a mathematical model of induction motor is described. With usage of -network equivalent circuit equations for calculation of individual power losses and overall efficiency are derived. Research study of loss minimization control is introduced in the next part. Several often used methods of variable frequency drive control are described. Also a review of loss minimization techniques from the perspective of induction motor control are presented. The last part of this paper includes a detailed description of scalar induction motor drive focused on reaching optimal efficiency. The loss minimization technique used is a model based method with rotor frequency being the control variable. At the end the performance of this method is verified using a computational script in Matlab.
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Operation of induction motor with respect to maximum efficiency
Čech, Jiří ; Ctibor, Jiří (referee) ; Toman, Marek (advisor)
In the first part of this paper a mathematical model of induction motor is described. With usage of -network equivalent circuit equations for calculation of individual power losses and overall efficiency are derived. Research study of loss minimization control is introduced in the next part. Several often used methods of variable frequency drive control are described. Also a review of loss minimization techniques from the perspective of induction motor control are presented. The last part of this paper includes a detailed description of scalar induction motor drive focused on reaching optimal efficiency. The loss minimization technique used is a model based method with rotor frequency being the control variable. At the end the performance of this method is verified using a computational script in Matlab.
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Calculation of optimum slip frequency of induction motor for minimisation of its losses
Bednařík, Václav ; Patočka, Miroslav (referee) ; Vorel, Pavel (advisor)
This master’s thesis focuses on the minimisation of losses by calculation of optimum slip frequency of induction motor. The next point of this master‘s thesis is supersaturation. Supersaturation must be solved for the size of losses, because of the effect that is cause of the losses, when current increases with saturation. However current is not increase proportionally with increasing saturation, but increases several times more. This problem is included in the calculation of the slip frequency. Optimum of slip frequency is solve for modified gamma model of induction machine. In the main point of this thesis is outlined the process, how the optimum can be found. With same process were already were found the equations, but they were too extensit. In the end is solved the optimum of slip frequency be minimum of the flux density.
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