Douglas_2 | Online Design Tools for Locally Manufactured Small Wind Turbines

Submitted by Adriprevost on Fri, 16/05/2025 - 15:46

Duration:

00:00:34

Tabs

Results

Blade Rotor Outputs
Property	Value	Variable name
RPM at the cut-in wind speed (TSR)	250.796 RPM	n_cut_in
RPM at the nominal wind speed (TSR)	382.66 RPM	n_nom
Nominal tip speed ratio	4.00518	tsr_nom

Generator Rotor Outputs
Property	Value	Variable name
Rotor disk thickness	10 mm	hr
Magnet width-to-pole pitch ratio	0.577686	ai
Inner-to-outer magnet radius	0.742236	kd
Flux density in airgap	0.629084 T	Bmax
Flux density on magnet surface	0.64647 T	Bmg
First harmonic of flux density in airgap	0.570883 T	Bp
Flux per pole (Calculated)	0.000926498 Wb	Flux_pole
Magnets on a rotor disk	8	magnet_num
Distance between magnets	21.847 mm	dist_magnet_Rin
Magnet mass	1656 g	MagnetMass
Magnet density	7.5 g/cm3	mag_density
Volume of a single magnet	13800 mm3	Vmag
Volume of all magnets	220800 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	237.273 mm	Dout
Average radius	101.385 mm	Ravg
Inner radius	86.3855 mm	Rin
Outer radius	118.636 mm	Rout
Effective outer radius	116.385 mm	Rout_eff
Mass of rotor disks	6.95969 kgr	BackIronMass
Volume of rotor disks	884.332 cm3	BackIronVolume
Maximum flux density in the magnet rotor disk	1.63739 T	SaturMAX
Is the magnet rotor disk saturated?	Yes	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	79	Nc
Copper wire diameter	1.6 mm	dc
Number of wires at hand	1	No_wires_at_hand
Winding fill factor	0.55	kf
Copper wire cross-sectional area	2.01 mm2	sc
Copper wire cross-sectional area (Calculated)	1.99978 mm²	sc_theor
Copper wire cross-sectional area of a sinlge wire	2.01 mm²	sc_multi_wires
Copper wire diameter (Calculated)	1.59609 mm	dc_theor
Coil leg width	22.2084 mm	wc
Average length of coil turn	221.734 mm	lavg
Stator nominal temperature	71.3249 C°	tc_real
Stator surface area	590.924 cm²	stator_surface_area
Heat coefficient	0.252726	cq_real
Current density	5.9695 A	Jmax_real
Resistivity of copper at nominal temperature	1.9838E-8 Ohm.m	pt
Resistance of a single coil	0.172887 Ohm	Rc
Phase resistance	0.345774 Ohm	Rphase
Phase inductance	0.000929356 H	Ls
Nagaoka constant	0.196868	Kn
Winding coefficient	0.95	kw
Volume of a single coil	64016.7 mm3	coil_volume
Weight of a single coil	322.739 g	coil_weight_constr
Coil hole at Ravg	46 mm	coil_hole_Ravg
Coil hole at Rin	46 mm	coil_hole_Rin_constr
Coil hole at Rout	46 mm	coil_hole_Rout_constr
Coil mass for construction	2.25917 kgr	mcu_constr
EMF at the cut-in wind speed (Calculated)	10.264 V	EMF_cut_in
EMF at the nominal wind speed (Calculated)	15.754 V	EMF_nom
Current at the nominal wind speed	11.9987 A	Iac_nom
Terminal voltage at the nominal wind speed	11.2904 V	V_term_line
Nominal frequency	25.5107 Hz	fnom
Generator power (Calculated)	406.411 W	Pnom
Copper losses (Calculated)	149.342 W	Pcopper
Eddy current losses (Calculated)	3.82407 W	Peddy
Generator efficiency (Calculated)	0.712412	efficiency_real
AC Power at the rectifier (Calculated)	365.769 W	Pnom_rect
DC Power at the batteries (Calculated)	329.193 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)	10.895 W	Prot

Costs, Mass and Volume
Property	Value	Variable name
Total generator cost	255.49 EUR	Totalcost
Total generator mass	11.9252 kgr	TotalMass
Total generator volume	2.60878 dm3	TotalVolume
Blade rotor mass	1.91156 kgr	blade_rotor_mass
Softwood density	500 kgr/m³	softwood_density
Cost of magnets	153.703 EUR	Magcost
Magnet shipping cost	13.3333 EUR	shippingcost
Copper mass	1.88862 kgr	mcu
Cost of copper	27.8761 EUR	coppercost
Resin mass	1.42091 kgr	resinmass
Cost of resin	19.6269 EUR	resincost
Resin volume	1044.79 cm3	ResinVolume
Total mass of one generator rotor	4.30785 kgr	TotalMassRotor
Cost of iron	8.56042 EUR	ironcost
Surface area of moulds	0.288662 m2	woodS
Total cost of moulds	45.724 EUR	woodcost

Output files

Octave/Matlab variable file:

simulation-9836.mat

Input parameters

Blade Rotor Inputs

Turbine radius:

1.00m

Aerodynamic coefficient:

0.30

Cut-in wind speed:

3.00m/s

Nominal wind speed:

10.00m/s

Cut-in TSR:

8.75

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:

46mm

Magnet thickness:

10mm

Rotor disk thickness:

User Defined

Rotor disk thickness:

10mm

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