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Permanent magnet machines with air gap windings and integrated teeth windings

Abstract

The Thesis deals with axial and radial flux permanent magnet machines with air gap windings and an integrated teeth winding. The aim is to develop a machine that produces a high torque per unit volume with as low losses as possible. The hypothesis is that an advanced three-phase winding, magnetized by a permanent magnet rotor should be better than other machine topologies. The finite element method is used to find favourable dimensions of the slotless winding, the integrated teeth winding and the permanent magnet rotor. Three machines were built and tested in order to verify calculations. It can be concluded that the analysis method shows good agreement with the calculated and the measured values of induced voltage and torque. The experiments showed that the slotless machine with NdFeB-magnets performs approximately like the slotted machine. A theoretical comparison of axial flux topology to radial flux topology showed that the torque production of the inner rotor radial flux machine is superior to that of the axial flux machine. An integrated teeth winding based on iron powder teeth glued to the winding was studied. The force density of a pole with integrated teeth is around three times the force density of a slotless  More>>
Authors:
Alatalo, M [1] 
  1. Chalmers Univ. of Technology, Goeteborg (Sweden). School of Electrical and Computer Engineering
Publication Date:
Jun 01, 1996
Product Type:
Thesis/Dissertation
Report Number:
NUTEK-VIND-96-13; CTH-ED-288
Reference Number:
SCA: 170603; 330400; PA: SWD-97:007058; EDB-97:013081; NTS-97:005373; SN: 97001719440
Resource Relation:
Other Information: TH: Doctoral diss.(TeknD); PBD: Jun 1996
Subject:
17 WIND ENERGY; 33 ADVANCED PROPULSION SYSTEMS; ELECTRIC GENERATORS; WIND TURBINES; PERMANENT MAGNETS; FINITE ELEMENT METHOD; NEODYMIUM COMPOUNDS; HYBRID ELECTRIC-POWERED VEHICLES
OSTI ID:
414551
Research Organizations:
Swedish National Board for Industrial and Technical Development (NUTEK), Stockholm (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE97722080; CNN: Project NUTEK-P2939; TRN: SE9707058
Availability:
Also available from Studsvik Library, SE-611 82 Nykoeping, Sweden; OSTI as DE97722080
Submitting Site:
SWD
Size:
142 p.
Announcement Date:

Citation Formats

Alatalo, M. Permanent magnet machines with air gap windings and integrated teeth windings. Sweden: N. p., 1996. Web.
Alatalo, M. Permanent magnet machines with air gap windings and integrated teeth windings. Sweden.
Alatalo, M. 1996. "Permanent magnet machines with air gap windings and integrated teeth windings." Sweden.
@misc{etde_414551,
title = {Permanent magnet machines with air gap windings and integrated teeth windings}
author = {Alatalo, M}
abstractNote = {The Thesis deals with axial and radial flux permanent magnet machines with air gap windings and an integrated teeth winding. The aim is to develop a machine that produces a high torque per unit volume with as low losses as possible. The hypothesis is that an advanced three-phase winding, magnetized by a permanent magnet rotor should be better than other machine topologies. The finite element method is used to find favourable dimensions of the slotless winding, the integrated teeth winding and the permanent magnet rotor. Three machines were built and tested in order to verify calculations. It can be concluded that the analysis method shows good agreement with the calculated and the measured values of induced voltage and torque. The experiments showed that the slotless machine with NdFeB-magnets performs approximately like the slotted machine. A theoretical comparison of axial flux topology to radial flux topology showed that the torque production of the inner rotor radial flux machine is superior to that of the axial flux machine. An integrated teeth winding based on iron powder teeth glued to the winding was studied. The force density of a pole with integrated teeth is around three times the force density of a slotless pole. A direct drive wind power generator of 6.4 kW with integrated teeth can have the same power losses and magnet weight as a transversal flux machine. Compared to a standard induction machine the integrated teeth machine had approximately 2.5 times the power capacity of the induction machine with the same power losses and outer volume. 39 refs}
place = {Sweden}
year = {1996}
month = {Jun}
}