|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 7 van 8 gevonden artikelen
| Titel: |
TORQUE CALCULATION OF MACHINES WITH PERMANENT MAGNET MATERIALS |
| Auteur: |
Platt, D. Geetha, S. |
| Verschenen in: |
Electric power components & systems |
| Paginering: | Jaargang 24 (1996) nr. 4 pagina's 393-415 |
| Jaar: |
1996-01-01 |
| Inhoud: |
The prediction of torque in permanent magnet motors is essential for both their design and control. Most literature in the area uses the Lorenz equation for the force on a conductor in a magnetic field. This implies a model consisting of a slotless armature with the conductors distributed in the airgap. This is clearly not the case for the great majority of motors. In addition, this model is incapable of predicting such effects as cogging torque. A more fundamental approach is to use the energy transfer relationship, but this requires knowledge of the energy density of permanent magnet materials. There is surprisingly little agreement on the calculation of this energy. This paper uses an expression for energy density derived using a simple theoretical model, to develop an expression for torque for a permanent magnet machine with one slot per pole per phase. The expression for torque is then compared with the theoretical results from the conventional approach. The analysis is confined to the linear region of operation. The model is then generalised for any number of slots and phases using the Discrete Fourier Transform (DFT), and a general expression is developed for useful torque. This DFT model will be most appropriate for machines with a low number of slots per pole since the discrete nature of the machine is most apparent for these cases. Cogging and useful torques of a laboratory servo motor is predicted using the model and compared with measured values. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 8 gevonden artikelen
| << vorige | volgende >> |