2nd Comet-ME 4.2m N42 current density for rotor diameter 450 | Online Design Tools for Locally Manufactured Small Wind Turbines

Submitted by Kostas on Tue, 17/04/2018 - 09:50

Duration:

00:00:51

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)	189.702 RPM	n_nom
Nominal tip speed ratio	4.16965	tsr_nom

Generator Rotor Outputs
Property	Value	Variable name
Rotor disk thickness	10 mm	hr
Magnet width-to-pole pitch ratio	0.498649	ai
Inner-to-outer magnet radius	0.785551	kd
Flux density in airgap	0.61301 T	Bmax
Flux density on magnet surface	0.714915 T	Bmg
First harmonic of flux density in airgap	0.526422 T	Bp
Flux per pole (Calculated)	0.000990904 Wb	Flux_pole
Magnets on a rotor disk	20	magnet_num
Distance between magnets	22.9369 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	430.055 mm	Dout
Average radius	191.504 mm	Ravg
Inner radius	168.503 mm	Rin
Outer radius	215.027 mm	Rout
Effective outer radius	214.503 mm	Rout_eff
Mass of rotor disks	22.8635 kgr	BackIronMass
Volume of rotor disks	2905.14 cm3	BackIronVolume
Maximum flux density in the magnet rotor disk	1.33375 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	1.9 mm	dc
Number of wires at hand	1	No_wires_at_hand
Winding fill factor	0.57	kf
Copper wire cross-sectional area	2.83 mm2	sc
Copper wire cross-sectional area (Calculated)	2.68168 mm²	sc_theor
Copper wire cross-sectional area of a sinlge wire	2.83 mm²	sc_multi_wires
Copper wire diameter (Calculated)	1.84828 mm	dc_theor
Coil leg width	20.2734 mm	wc
Average length of coil turn	215.658 mm	lavg
Stator nominal temperature	133.734 C°	tc_real
Stator surface area	1311.64 cm²	stator_surface_area
Heat coefficient	0.468464	cq_real
Current density	7.58071 A	Jmax_real
Resistivity of copper at nominal temperature	2.38358E-8 Ohm.m	pt
Resistance of a single coil	0.0890033 Ohm	Rc
Phase resistance	0.445016 Ohm	Rphase
Phase inductance	0.00089781 H	Ls
Nagaoka constant	0.192961	Kn
Winding coefficient	0.95	kw
Volume of a single coil	52465.5 mm3	coil_volume
Weight of a single coil	278.266 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	4.45226 kgr	mcu_constr
EMF at the cut-in wind speed (Calculated)	20.528 V	EMF_cut_in
EMF at the nominal wind speed (Calculated)	32.3808 V	EMF_nom
Current at the nominal wind speed	21.4534 A	Iac_nom
Terminal voltage at the nominal wind speed	22.5808 V	V_term_line
Nominal frequency	31.617 Hz	fnom
Generator power (Calculated)	1453.31 W	Pnom
Copper losses (Calculated)	614.455 W	Pcopper
Eddy current losses (Calculated)	17.7729 W	Peddy
Generator efficiency (Calculated)	0.689933	efficiency_real
AC Power at the rectifier (Calculated)	1307.98 W	Pnom_rect
DC Power at the batteries (Calculated)	1177.18 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)	20.9131 W	Prot

Costs, Mass and Volume
Property	Value	Variable name
Total generator cost	789.346 EUR	Totalcost
Total generator mass	35.5488 kgr	TotalMass
Total generator volume	10.4585 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	4.01031 kgr	mcu
Cost of copper	59.1922 EUR	coppercost
Resin mass	2.46505 kgr	resinmass
Cost of resin	34.0494 EUR	resincost
Resin volume	1812.53 cm3	ResinVolume
Total mass of one generator rotor	14.5367 kgr	TotalMassRotor
Cost of iron	28.122 EUR	ironcost
Surface area of moulds	0.53298 m2	woodS
Total cost of moulds	84.424 EUR	woodcost

Output files

Octave/Matlab variable file:

simulation-545.mat

Input parameters

Blade Rotor Inputs

Turbine radius:

2.10m

Aerodynamic coefficient:

0.25

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:

8.00A/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