|
|
Design of Electrical Machine 6 kW, 120 000 rpm for Helium Turbo-Circulator
Bárta, Jan ; Rafajdus,, Pavol (referee) ; Dušek,, Jiří (referee) ; Ondrůšek, Čestmír (advisor)
The induction machine with a squirrel cage is a workhorse of the industry. The main advantage of an induction machine is the low manufacturing price, simple and robust construction, low maintenance requirements. However, for high-speed applications, induction machine with a squirrel cage requires design modification due to the mechanical restrictions. The objective of this thesis is to show design process, methodology and assembly of the induction machine for high-speed applications. In this thesis, the rotor dimensioning data are presented. The results are demonstrated on the design of the 6 kW, 120 000 rpm solid rotor squirrel cage induction machine. This thesis also contains calculation and design of three different electrical machine topologies for a turbo circulator application. The electrical machines are designed with 6 kW output power at 120 000 rpm. The machines are estimated by using electromagnetic, thermal, and mechanical calculations. The drawbacks and advantages of each topology under study are described. For other high-speed applications, a comparative method helps in choosing the suitable electrical machine topology by examinations of discussed criteria. Rotor design effect on the electromagnetic performance of the induction machine is shown. Mechanical stresses are calculated with Finite Element Method analysis. Various assembly technologies to produce solid rotor with squirrel cage are discuss and compare. Describe approach enables high electromagnetic performance and durable construction of the high-speed induction machine. Work is confirmed by measurement on the manufactured prototype.
|
|
|
Analysis of possibilities to improvement induction motors efficiency
Novotný, Jiří ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
In the first part of the master’s thesis dealing with the increasing efficiency of induction motors there are briefly presented basic information about induction motors, followed by an overview of the losses of induction motors. The next part deals with the ways to increase efficiency of induction motors without increasing tooling costs. The practical part consists of four measurements of four induction motors, with their various mechanical adjustments to make comparing benefits of these modifications possible. The measured results are compared by a finite element method in Maxwell 2D Design program, in which the same motors are simulated as measured. Theoretical knowledge about the increase of efficiency is practically applied while being implemented in the simulations.
|
|
|
Influence of rotor slots number on a small induction motor losses
Palsovics, Norbert ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
The aim of this semester work is to analyze the losses of induction motor, according to their measure, use programs using the finite element method for the detection of the motor and the subsequent evaluation and comparison of the results obtained. The first part deals with the general AM, losses and measure their losses. The next section is very Lossmeasurement submitted asynchronous motors. The measured two machines have different characteristics in the sheet. The following section is calculating the losses using the finite element method using ANSYS Maxwell and RMXprt.The next part is the analysis of motor losses with a different number of rotor bars. This section is addressed to the models developed and validated by measuring the actual machine.
|
|
| |
|
|
Design of Electrical Machine 6 kW, 120 000 rpm for Helium Turbo-Circulator
Bárta, Jan ; Rafajdus,, Pavol (referee) ; Dušek,, Jiří (referee) ; Ondrůšek, Čestmír (advisor)
The induction machine with a squirrel cage is a workhorse of the industry. The main advantage of an induction machine is the low manufacturing price, simple and robust construction, low maintenance requirements. However, for high-speed applications, induction machine with a squirrel cage requires design modification due to the mechanical restrictions. The objective of this thesis is to show design process, methodology and assembly of the induction machine for high-speed applications. In this thesis, the rotor dimensioning data are presented. The results are demonstrated on the design of the 6 kW, 120 000 rpm solid rotor squirrel cage induction machine. This thesis also contains calculation and design of three different electrical machine topologies for a turbo circulator application. The electrical machines are designed with 6 kW output power at 120 000 rpm. The machines are estimated by using electromagnetic, thermal, and mechanical calculations. The drawbacks and advantages of each topology under study are described. For other high-speed applications, a comparative method helps in choosing the suitable electrical machine topology by examinations of discussed criteria. Rotor design effect on the electromagnetic performance of the induction machine is shown. Mechanical stresses are calculated with Finite Element Method analysis. Various assembly technologies to produce solid rotor with squirrel cage are discuss and compare. Describe approach enables high electromagnetic performance and durable construction of the high-speed induction machine. Work is confirmed by measurement on the manufactured prototype.
|
|
|
Influence of rotor slots number on a small induction motor losses
Palsovics, Norbert ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
The aim of this semester work is to analyze the losses of induction motor, according to their measure, use programs using the finite element method for the detection of the motor and the subsequent evaluation and comparison of the results obtained. The first part deals with the general AM, losses and measure their losses. The next section is very Lossmeasurement submitted asynchronous motors. The measured two machines have different characteristics in the sheet. The following section is calculating the losses using the finite element method using ANSYS Maxwell and RMXprt.The next part is the analysis of motor losses with a different number of rotor bars. This section is addressed to the models developed and validated by measuring the actual machine.
|
|
|
Analysis of possibilities to improvement induction motors efficiency
Novotný, Jiří ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
In the first part of the master’s thesis dealing with the increasing efficiency of induction motors there are briefly presented basic information about induction motors, followed by an overview of the losses of induction motors. The next part deals with the ways to increase efficiency of induction motors without increasing tooling costs. The practical part consists of four measurements of four induction motors, with their various mechanical adjustments to make comparing benefits of these modifications possible. The measured results are compared by a finite element method in Maxwell 2D Design program, in which the same motors are simulated as measured. Theoretical knowledge about the increase of efficiency is practically applied while being implemented in the simulations.
|
|
|
Nulová složka v třífázových asynchronních motorech
Schreier, Luděk ; Chomát, Miroslav
The paper deals with such a case of influence of zero-sequence component on the induction machine when this component arises due to connection of the stator winding neutral with the feeding source. The relationship between the zero-sequence component and the third space harmonic of stator current layer is shower. Furthermore, the paper deals with the methods of suppressing the undesirable influence of the zero-sequence component on the induction motor, especially an increase of additional losses and a rise of parasitic torques.
|
guest ::
