Comet-ME 4.2m N42 | Online Design Tools for Locally Manufactured Small Wind Turbines

Submitted by Kostas on Tue, 17/04/2018 - 09:12

Duration:

00:00:59

Tabs

Results

Blade Rotor Outputs
Property	Value	Variable name
RPM at the cut-in wind speed (TSR)	119.427 RPM	n_cut_in
RPM at the nominal wind speed (TSR)	177.786 RPM	n_nom
Nominal tip speed ratio	3.90774	tsr_nom

Generator Rotor Outputs
Property	Value	Variable name
Rotor disk thickness	10 mm	hr
Magnet width-to-pole pitch ratio	0.34747	ai
Inner-to-outer magnet radius	0.845546	kd
Flux density in airgap	0.61583 T	Bmax
Flux density on magnet surface	0.716237 T	Bmg
First harmonic of flux density in airgap	0.418349 T	Bp
Flux per pole (Calculated)	0.000990412 Wb	Flux_pole
Magnets on a rotor disk	20	magnet_num
Distance between magnets	49.1128 mm	dist_magnet_Rin
Magnet mass	6210 g	MagnetMass
Magnet density	7.5 g/cm3	mag_density
Volume of a single magnet	20700 mm3	Vmag
Volume of all magnets	828000 mm3	VolumeMagnet
Remanent magnetic flux density	1.3 T	Br
Magnetic coercivity	1006580 A/m	Hc
Maximum Energy Product	342 KJ/m³	BHmax
Outer diameter	596.403 mm	Dout
Average radius	274.824 mm	Ravg
Inner radius	251.824 mm	Rin
Outer radius	298.201 mm	Rout
Effective outer radius	297.824 mm	Rout_eff
Mass of rotor disks	43.9718 kgr	BackIronMass
Volume of rotor disks	5587.27 cm3	BackIronVolume
Maximum flux density in the magnet rotor disk	1.31914 T	SaturMAX
Is the magnet rotor disk saturated?	No	Saturation

Generator Stator Outputs
Property	Value	Variable name
Stator thickness	12 mm	tw
Number of phases	3	nphase
Number of coils per phase	5	q
Total number of coils in stator	15	coil_num
Number of turns per coil	49	Nc
Copper wire diameter	1.8 mm	dc
Number of wires at hand	2	No_wires_at_hand
Winding fill factor	0.55	kf
Copper wire cross-sectional area	5.08 mm2	sc
Copper wire cross-sectional area (Calculated)	4.58054 mm²	sc_theor
Copper wire cross-sectional area of a sinlge wire	2.54 mm²	sc_multi_wires
Copper wire diameter (Calculated)	2.41559 mm	dc_theor
Coil leg width	37.7152 mm	wc
Average length of coil turn	270.426 mm	lavg
Stator nominal temperature	56.0229 C°	tc_real
Stator surface area	3059.74 cm²	stator_surface_area
Heat coefficient	0.185111	cq_real
Current density	5.41008 A	Jmax_real
Resistivity of copper at nominal temperature	1.9165E-8 Ohm.m	pt
Resistance of a single coil	0.0499907 Ohm	Rc
Phase resistance	0.249954 Ohm	Rphase
Phase inductance	0.00102345 H	Ls
Nagaoka constant	0.139891	Kn
Winding coefficient	0.95	kw
Volume of a single coil	122390 mm3	coil_volume
Weight of a single coil	626.353 g	coil_weight_constr
Coil hole at Ravg	30 mm	coil_hole_Ravg
Coil hole at Rin	30 mm	coil_hole_Rin_constr
Coil hole at Rout	30 mm	coil_hole_Rout_constr
Coil mass for construction	10.0216 kgr	mcu_constr
EMF at the cut-in wind speed (Calculated)	20.528 V	EMF_cut_in
EMF at the nominal wind speed (Calculated)	30.3317 V	EMF_nom
Current at the nominal wind speed	27.4832 A	Iac_nom
Terminal voltage at the nominal wind speed	22.5808 V	V_term_line
Nominal frequency	29.631 Hz	fnom
Generator power (Calculated)	1861.78 W	Pnom
Copper losses (Calculated)	566.391 W	Pcopper
Eddy current losses (Calculated)	35.7733 W	Peddy
Generator efficiency (Calculated)	0.747388	efficiency_real
AC Power at the rectifier (Calculated)	1675.6 W	Pnom_rect
DC Power at the batteries (Calculated)	1508.04 W	Pnom_dc

Generator Bearing Hub Outputs
Property	Value	Variable name
Number of bolts on hub	5	No_bolts_hub
Mass of bearing hub	8344.46 g	BearingHubMass
Rotational losses (Calculated)	27.105 W	Prot

Costs, Mass and Volume
Property	Value	Variable name
Total generator cost	954.485 EUR	Totalcost
Total generator mass	63.2863 kgr	TotalMass
Total generator volume	20.1142 dm3	TotalVolume
Blade rotor mass	17.7029 kgr	blade_rotor_mass
Softwood density	500 kgr/m³	softwood_density
Cost of magnets	583.558 EUR	Magcost
Magnet shipping cost	50 EUR	shippingcost
Copper mass	9.02685 kgr	mcu
Cost of copper	133.236 EUR	coppercost
Resin mass	4.0777 kgr	resinmass
Cost of resin	56.3248 EUR	resincost
Resin volume	2998.31 cm3	ResinVolume
Total mass of one generator rotor	25.0909 kgr	TotalMassRotor
Cost of iron	54.0853 EUR	ironcost
Surface area of moulds	0.803538 m2	woodS
Total cost of moulds	127.28 EUR	woodcost

Output files

Octave/Matlab variable file:

simulation-540.mat

Input parameters

Blade Rotor Inputs

Turbine radius:

2.10m

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 N42

Number of generator poles:

Magnet length:

46mm

Magnet width:

30mm

Magnet thickness:

15mm

Rotor disk thickness:

User Defined

Rotor disk thickness:

10mm

Mechanical clearance:

5.00mm

Generator Stator Inputs

Select coil type:

Rectangular

Winding fill factor:

Calculated

Stator thickness:

User defined

Stator thickness:

12mm

Current density:

6.00A/mm2

System Inputs

System voltage:

48.00V

Nominal voltage:

48.00V

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