practise 9 | Online Design Tools for Locally Manufactured Small Wind Turbines

Submitted by morganmccaughey on Sat, 13/03/2021 - 18:09

Duration:

00:01:07

Tabs

Results

Blade Rotor Outputs
Property	Value	Variable name
RPM at the cut-in wind speed (TSR)	268.71 RPM	n_cut_in
RPM at the nominal wind speed (TSR)	732.32 RPM	n_nom
Nominal tip speed ratio	6.13196	tsr_nom

Generator Rotor Outputs
Property	Value	Variable name
Rotor disk thickness	10 mm	hr
Magnet width-to-pole pitch ratio	0.129609	ai
Inner-to-outer magnet radius	0.73507	kd
Flux density in airgap	0.307796 T	Bmax
Flux density on magnet surface	0.647658 T	Bmg
First harmonic of flux density in airgap	0.142912 T	Bp
Flux per pole (Calculated)	0.000194578 Wb	Flux_pole
Magnets on a rotor disk	8	magnet_num
Distance between magnets	55.3744 mm	dist_magnet_Rin
Magnet mass	360 g	MagnetMass
Magnet density	7.5 g/cm3	mag_density
Volume of a single magnet	3000 mm3	Vmag
Volume of all magnets	48000 mm3	VolumeMagnet
Remanent magnetic flux density	1.265 T	Br
Magnetic coercivity	982324 A/m	Hc
Maximum Energy Product	326 KJ/m³	BHmax
Outer diameter	226.695 mm	Dout
Average radius	98.2373 mm	Ravg
Inner radius	83.2373 mm	Rin
Outer radius	113.348 mm	Rout
Effective outer radius	113.237 mm	Rout_eff
Mass of rotor disks	6.35301 kgr	BackIronMass
Volume of rotor disks	807.244 cm3	BackIronVolume
Maximum flux density in the magnet rotor disk	0.436138 T	SaturMAX
Is the magnet rotor disk saturated?	No	Saturation

Generator Stator Outputs
Property	Value	Variable name
Stator thickness	13 mm	tw
Number of phases	3	nphase
Number of coils per phase	2	q
Total number of coils in stator	6	coil_num
Number of turns per coil	349	Nc
Copper wire diameter	1 mm	dc
Number of wires at hand	1	No_wires_at_hand
Winding fill factor	0.55	kf
Copper wire cross-sectional area	0.79 mm2	sc
Copper wire cross-sectional area (Calculated)	0.720823 mm²	sc_theor
Copper wire cross-sectional area of a sinlge wire	0.79 mm²	sc_multi_wires
Copper wire diameter (Calculated)	0.958252 mm	dc_theor
Coil leg width	38.5608 mm	wc
Average length of coil turn	201.081 mm	lavg
Stator nominal temperature	61.2432 C°	tc_real
Stator surface area	930.462 cm²	stator_surface_area
Heat coefficient	0.209208	cq_real
Current density	5.47461 A	Jmax_real
Resistivity of copper at nominal temperature	1.95252E-8 Ohm.m	pt
Resistance of a single coil	1.73446 Ohm	Rc
Phase resistance	3.46893 Ohm	Rphase
Phase inductance	0.0124355 H	Ls
Nagaoka constant	0.164128	Kn
Winding coefficient	0.95	kw
Volume of a single coil	100800 mm3	coil_volume
Weight of a single coil	498.474 g	coil_weight_constr
Coil hole at Ravg	10 mm	coil_hole_Ravg
Coil hole at Rin	10 mm	coil_hole_Rin_constr
Coil hole at Rout	10 mm	coil_hole_Rout_constr
Coil mass for construction	3.48932 kgr	mcu_constr
EMF at the cut-in wind speed (Calculated)	10.264 V	EMF_cut_in
EMF at the nominal wind speed (Calculated)	27.9722 V	EMF_nom
Current at the nominal wind speed	4.32494 A	Iac_nom
Terminal voltage at the nominal wind speed	11.2904 V	V_term_line
Nominal frequency	48.8213 Hz	fnom
Generator power (Calculated)	146.491 W	Pnom
Copper losses (Calculated)	194.66 W	Pcopper
Eddy current losses (Calculated)	0.511843 W	Peddy
Generator efficiency (Calculated)	0.408781	efficiency_real
AC Power at the rectifier (Calculated)	131.842 W	Pnom_rect
DC Power at the batteries (Calculated)	118.658 W	Pnom_dc

Generator Bearing Hub Outputs
Property	Value	Variable name
Number of bolts on hub	4	No_bolts_hub
Mass of bearing hub	3708.65 g	BearingHubMass
Rotational losses (Calculated)	16.6974 W	Prot

Costs, Mass and Volume
Property	Value	Variable name
Total generator cost	156.996 EUR	Totalcost
Total generator mass	11.2558 kgr	TotalMass
Total generator volume	2.38137 dm3	TotalVolume
Blade rotor mass	0.978718 kgr	blade_rotor_mass
Softwood density	500 kgr/m³	softwood_density
Cost of magnets	39.6746 EUR	Magcost
Magnet shipping cost	2.89855 EUR	shippingcost
Copper mass	2.9738 kgr	mcu
Cost of copper	43.8934 EUR	coppercost
Resin mass	1.56903 kgr	resinmass
Cost of resin	21.6728 EUR	resincost
Resin volume	1153.7 cm3	ResinVolume
Total mass of one generator rotor	3.3565 kgr	TotalMassRotor
Cost of iron	7.8142 EUR	ironcost
Surface area of moulds	0.277408 m2	woodS
Total cost of moulds	43.9414 EUR	woodcost

Output files

Octave/Matlab variable file:

simulation-6983.mat

Input parameters

Blade Rotor Inputs

Turbine radius:

0.80m

Aerodynamic coefficient:

0.30

Cut-in wind speed:

3.00m/s

Nominal wind speed:

10.00m/s

Cut-in TSR:

7.50

Design TSR:

7.00

Air density:

1.204kg/m³

Generator Rotor Inputs

AFPM rotor topology:

Double Rotor

Magnetic material:

NdFeB N40

Number of generator poles:

Magnet length:

30mm

Magnet width:

10mm

Magnet thickness:

10mm

Rotor disk thickness:

Calculated

Mechanical clearance:

3.00mm

Generator Stator Inputs

Select coil type:

Rectangular

Winding fill factor:

User defined

Winding fill factor:

0.55

Stator thickness:

User defined

Stator thickness:

13mm

Current density:

6.00A/mm2

System Inputs

System voltage:

24.00V

Nominal voltage:

24.00V

Transmission cable losses:

10.00%

Rectifier losses:

10.00%

Financial

Copper price:

12.00€/kg

Iron price:

1.00€/kg

Resin price:

11.23€/kg

Plywood price:

17.60 €/m²

Simulation Inputs

Also run UserAFPM:

false

Constants

Copper resistivity:

1.678E-8 Ω·m

Copper density:

8.94g/cm³

Iron density:

7.87g/cm³

Resin density:

1.36g/cm³