Download presentation
Presentation is loading. Please wait.
Published byAnis Carol Harris Modified over 9 years ago
1
NORPIE 2004 14-16 June, Trondheim, Norway Analysis of a PM Machine with Concentrated Fractional Pitch Windings Freddy Magnussen, Dmitry Svechkarenko, Peter Thelin, Chandur Sadarangani
2
Layout of presentation Introduction Torque ripple computation results Presentation of machine design Parasitic effects (noise and losses) Conclusions Laboratory prototype and measurements Thermal computation results
3
Machine design: 14 poles and 15 slots q=0,36 (number of slots per pole per phase; normally 0,5) k w1 =0,95 (fundamental winding factor; normally 0,87) Grain-oriented iron teeth, non-oriented iron yoke Rectangular copper conductors, c f =0,74
4
Electromotive force
5
FEM-computed torque ripple Pure sinusoidal q-current no inverter influence Current loadings: 0, 103, 207, 413 and 827 A/cm (RMS)
6
Air gap flux density Armature reaction for the current loading 827 A/cm (RMS) No-load flux density
7
Flux density in rotor back (Machine C) Current loadings: 0, 103, 207, 413 and 827 A/cm (RMS) Tangential flux density component at 2000 rpm
8
Radial magnetic stress in air gap Unbalanced radial forces noise
9
Some radial vibration mode shapes
10
Prototype stator
11
Measurement results Low speed high torque : copper loss thermal influence Generator tests Motor tests High speed low torque : iron loss thermal influence
12
Thermal computations (I) Aluminium frame Cooling duct Velocity profile Water-cooling cylinder
13
Thermal computations (II) Max 139ºC Max 86ºC Max 157ºC Max 98ºC [K] Inlet water: 22ºC
14
Conclusions High torque density (5,0 Nm/kg) Low torque ripple Concentrated winding machines with an odd number of slots and an almost equal number of poles (e.g 8/9, 14/15, 20/21) are sensitive to these parasitic effects: Unbalanced radial forces noise Alternating magnetic fields in the rotor losses Cost effective manufacturing process
15
Thank you!
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.