A Novel Direct-Drive Dual-Structure Permanent Magnet Machine

By incorporating the merits of fractional-slot concentrated windings and Vernier machine structure, a new multi-pole dual-structure permanent magnet (PM) machine is proposed for low speed, direct-drive applications in this paper. In the outer stator, a fractional-slot concentrated winding is adopted...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2010-06, Vol.46 (6), p.2036-2039
Main Authors: Niu, Shuangxia, Ho, S. L., Fu, W. N.
Format: Article
Language:English
Subjects:
Coils (windings)
Copper
Cross-disciplinary physics: materials science
rheology
Curvilinear element
Density
dual-structure
Exact sciences and technology
Finite element analysis
Finite element methods
finite-element method
Flexibility
Forging
fractional-slot concentrated winding
Machine windings
Magnetic flux leakage
Magnetism
Materials science
Mathematical analysis
Other topics in materials science
Permanent magnet machines
permanent magnetic motor
Permanent magnets
Physics
Simulation
Stator windings
Stators
Steady state
Studies
Teeth
Torque
Vernier structure
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Summary:By incorporating the merits of fractional-slot concentrated windings and Vernier machine structure, a new multi-pole dual-structure permanent magnet (PM) machine is proposed for low speed, direct-drive applications in this paper. In the outer stator, a fractional-slot concentrated winding is adopted to reduce the slot number and stator yoke height, hence saving space and improving torque density. In the inner stator, a Vernier structure is used to reduce the winding slots, thereby enlarging the slot area to accommodate more conductors, thus the inner stator space is fully utilized. Consequently, the merits of these two structures can be ingeniously integrated into one compact PM machine and the torque density is improved, cogging torque is reduced and the control flexibility with two sets of independent stator windings is increased. By using time-stepping finite element method with curvilinear elements for moving between the stator and the rotor, the steady state and transient performances of the PM machine are simulated and the validity of proposed dual-structure PM machine is verified.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2010.2041197