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| 2. |
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| 3. |
- Thelin, Peter, et al.
(författare)
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Calculation of the Airgap Flux Density of PM Synchronous Motors with Buried Magnets including Axial Leakage and Teeth Saturation
- 1999
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Ingår i: Proc. of the Electrical Machines and Drives Conference, Canterbury, UK, September 1999. - : Institution of Electrical Engineers (IEE). ; , s. 339-345
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Konferensbidrag (refereegranskat)abstract
- It has been shown earlier that the airgap flux density of unsaturated PM motors with buried magnets can be calculated analytically, with a satisfactory result, compared to 2D-FEM calculations. By taking axial leakage flux, and stator and rotor teeth saturation into account an improved expression for the airgap flux density, showing better agreement with experiments, is obtained.
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| 4. |
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| 5. |
- Thelin, Peter, et al.
(författare)
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Suggestions Regarding the Pole-Number of Inverter-Fed PM-Synchronous Motors with Buried Magnets
- 1998
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Ingår i: Proc. of the International Conference on Power Electronics and Variable Speed Drives 1998. - : Institution of Electrical Engineers (IEE). ; , s. 544-547
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Konferensbidrag (refereegranskat)abstract
- When designing an inverter-fed PM-motor, one is quite free to choose a number of poles which utilizes the machine in a good way. A common rule of thumb is to choose a high pole-number for low-speed motors and vice versa, but there are no sharp borderlines between the different areas. This paper gives a suggestion regarding the pole-number for a desired power and speed of the motor.
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| 7. |
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| 8. |
- Harnefors, Lennart, et al.
(författare)
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Model-Based Current Control of AC Machines Using the Internal Model Control Method
- 1998
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Ingår i: IEEE transactions on industry applications. - : Institute of Electrical and Electronics Engineers (IEEE). - 0093-9994 .- 1939-9367. ; 34:1, s. 133-141
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the internal model control (IMC) method is applied to AC machine current control. Permanent magnet synchronous machines and induction machines are considered. The result is synchronous-frame proportional integral (PI) or PI-type controllers, the parameters (gain and integration time) of which are expressed directly in certain machine parameters and the desired closed-loop bandwidth. This simplifies the controller design procedure, eliminating or reducing the need for trial-and-error steps, and is the main purpose for using IMC.
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| 9. |
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| 10. |
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| 11. |
- Harnefors, Lennart, et al.
(författare)
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Robust Current Control of AC Machines Using the Internal Model Control Method
- 1995
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Konferensbidrag (refereegranskat)abstract
- In the present paper, the internal model control (IMC) method is introduced and applied to AC machine current control. A permanent magnet synchronous machine is used as an example. It is shown that the IMC design is straightforward and the resulting controller is simple to implement. The controller parameters are expressed in the machine parameters and the desired closed-loop rise time. The extra cost of implementation compared to PI control is negligible. It is further shown that IMC is able to outperform PI control with as well as without decoupling with respect to dq variable interaction in the presence of parameter deviations.
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| 12. |
- Korssell, Tomas, et al.
(författare)
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Development and Testing of a Measurement Device for Prediction of Stator Core Quality
- 1996
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Konferensbidrag (refereegranskat)abstract
- In the past, and still today it has been hard to find good methods to locate and determine the magnitude of the iron losses in stator cores and from that obtain an overall quality check. In order to meet the future demands on high-effeciency motors with high power density it is essential to have a good knowledge where the stator losses are located and what size they have in specific parts of the stator. This paper presents a method to measure the stator core losses in different parts of the stator by means of a measurement device and determine the relative stator losses in the different parts. The paper gives a hint how to design an appropriate measurement device for a stator with certain dimensions. In the end of the paper results from measurements on sttator cores with different sheet qualities are presented.
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| 13. |
- Kretschmar, Karsten, et al.
(författare)
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An AC Converter with a Small DC link Capacitor for a 15kW Permanent Magnet Synchronous Integral Motor
- 1998
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Ingår i: Proc. of the International Conference on Power Electronics and Variable Speed Drives 1998. - : IEE. ; , s. 622-625
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Konferensbidrag (refereegranskat)abstract
- An AC/AC power converter designed to feed a permanent magnet synchronous motor with a rated power of 15 kW is investigated in this paper. The converter consists of a diode rectifier, a small DC link capacitor and an inverter, which is controlled by an open loop pulse width modulation system (PWM). The circuit is simulated and the simulation results are analyzed and verified by measurements. Due to the small capacitor, special emphasis is put on the analysis of the DC link voltage. The paper also includes an analytical expression of the ripple of the DC link voltage.
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| 15. |
- Nee, Hans-Peter, 1963-, et al.
(författare)
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On the Choice of Diameter-Length Ratio, Slot-Tooth Ratio and Pole Number of Variable Speed Induction Motor Drives
- 1996
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Konferensbidrag (refereegranskat)abstract
- The diameter-length ratio, slot-tooth ratio and the pole number can principally be chosen freely when designing a special induction motor for inverter supply. This paper deals with general aspects on these design parameters. Special attention is paid to motors requiring a high pull-out torque, such as traction motors. It is found that a traction motor should normally be an "iron motor". Moreover, it is found that the potential to increase the pull-out torque when making a slim motor is due to secondary effects like reduced end-turns. Finally, it is found that a design with four poles is seldom far from the optimal pole number. For high-speed drives two-pole motors are sometimes better and for traction drives six-pole motors are sometimes preferable.
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| 16. |
- Nee, Hans-Peter, 1963-
(författare)
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Rotor Slot Design of Inverter-Fed Induction Motors
- 1995
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Konferensbidrag (refereegranskat)abstract
- The most dramatic improvements in inverter-fed induction motors are achieved by the change of rotor slot geometry, which can reduce the harmonic winding losses of the rotor to a minimum. Based on an immense number of finite-element calculations, optimal values of different geometrical dimensions of the rotor slot with a U-shaped bridge have been determined. The slot can be designed step by step according to simple analytical expressions for any inverter-fed induction motor, regardless of power rating or speed. The basic principles of the loss mechanisms are explained qualitatively to support the results from the numerical calculations.
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| 17. |
- Nee, Hans-Peter, 1963-, et al.
(författare)
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The Steady-State Torque Equation of Induction Motors with U-Shaped Iron Bridges in the Rotor Slots
- 1996
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Konferensbidrag (refereegranskat)abstract
- In this paper a modified torque equation for inverter-fed induction motors with U-shaped iron bridges in the rotor is presented. The equation is derived from a modified equivalent circuit with a contsnt bridge voltage introduced in the rotor circuit. A simplified method to estimate the pull-out torque is also presented. This method can be used in conjunction with the conventional equivalent circuit.
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