mema | Online Design Tools for Locally Manufactured Small Wind Turbines

Submitted by lexii on Tue, 26/05/2020 - 03:44

Duration:

00:15:25

Tabs

Results

Blade Rotor Outputs
Property	Value	Variable name
RPM at the cut-in wind speed (TSR)	286.624 RPM	n_cut_in
RPM at the nominal wind speed (TSR)	432.468 RPM	n_nom
Nominal tip speed ratio	1.8106	tsr_nom
RPM at the cut-in wind speed (Flux Linkage)	269 RPM	cutin_RPM
Cut-in Voltage (Flux Linkage)	24 V	cutin_Voltage
Wind speed at cut-in RPM (Flux Linkage)	2.81553 m/s	cutin_Vw
Mechanical power (Torque)	1186.97 W	Pmech_Torque_x

Generator Rotor Outputs
Property	Value	Variable name
Rotor disk thickness	10 mm	hr
Magnet width-to-pole pitch ratio	0.369761	ai
Inner-to-outer magnet radius	0.746413	kd
Flux density in airgap	0.684963 T	Bmax
Flux density on magnet surface	0.757792 T	Bmg
First harmonic of flux density in airgap	0.460088 T	Bp
Flux per pole (Calculated)	0.000889639 Wb	Flux_pole
Magnets on a rotor disk	8	magnet_num
Distance between magnets	44.5996 mm	dist_magnet_Rin
Magnet mass	1664.64 g	MagnetMass
Magnet density	7.5 g/cm3	mag_density
Volume of a single magnet	13872 mm3	Vmag
Volume of all magnets	221952 mm3	VolumeMagnet
Remanent magnetic flux density	1.45 T	Br
Magnetic coercivity	1120020 A/m	Hc
Maximum Energy Product	422 KJ/m³	BHmax
Outer diameter	270.299 mm	Dout
Average radius	117.076 mm	Ravg
Inner radius	100.076 mm	Rin
Outer radius	135.15 mm	Rout
Effective outer radius	134.076 mm	Rout_eff
Mass of rotor disks	9.032 kgr	BackIronMass
Volume of rotor disks	1147.65 cm3	BackIronVolume
Maximum flux density in the magnet rotor disk	1.50449 T	SaturMAX
Is the magnet rotor disk saturated?	Yes	Saturation

Generator Stator Outputs
Property	Value	Variable name
Stator thickness	15 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	72	Nc
Copper wire diameter	1.7 mm	dc
Number of wires at hand	2	No_wires_at_hand
Winding fill factor	0.5	kf
Copper wire cross-sectional area	4.54 mm2	sc
Copper wire cross-sectional area (Calculated)	4.14884 mm²	sc_theor
Copper wire cross-sectional area of a sinlge wire	2.27 mm²	sc_multi_wires
Copper wire diameter (Calculated)	2.29894 mm	dc_theor
Coil leg width	44.0198 mm	wc
Average length of coil turn	250.324 mm	lavg
Stator nominal temperature	63.536 C°	tc_real
Stator surface area	1322.31 cm²	stator_surface_area
Heat coefficient	0.219431	cq_real
Current density	5.48304 A	Jmax_real
Resistivity of copper at nominal temperature	1.96583E-8 Ohm.m	pt
Resistance of a single coil	0.0780413 Ohm	Rc
Phase resistance	0.156083 Ohm	Rphase
Phase inductance	0.000697557 H	Ls
Nagaoka constant	0.161054	Kn
Winding coefficient	0.95	kw
Volume of a single coil	165288 mm3	coil_volume
Weight of a single coil	751.844 g	coil_weight_constr
Coil hole at Ravg	34 mm	coil_hole_Ravg
Coil hole at Rin	16.2419 mm	coil_hole_Rin_constr
Coil hole at Rout	51.5417 mm	coil_hole_Rout_constr
Coil mass for construction	5.2629 kgr	mcu_constr
RMS flux linkage of phase A	0.044107 Wb	FluxRmsA
RMS flux linkage of phase B	0.0431222 Wb	FluxRmsB
RMS flux linkage of phase C	0.0437927 Wb	FluxRmsC
EMF at the cut-in wind speed (Calculated)	10.264 V	EMF_cut_in
EMF at the nominal wind speed (Calculated)	15.5814 V	EMF_nom
RMS of EMF of phase A (Flux Linkage)	15.7139 V	V_rmsA
RMS of EMF of phase B (Flux Linkage)	15.9305 V	V_rmsB
RMS of EMF of phase C (Flux Linkage)	15.7642 V	V_rmsC
Current at the nominal wind speed	24.893 A	Iac_nom
Terminal voltage at the nominal wind speed	11.2904 V	V_term_line
Nominal frequency	28.8312 Hz	fnom
Generator power (Calculated)	843.157 W	Pnom
Generator power (Torque)	876.885 W	PelN_Torque_x
Electromagnetic power (Torque)	1174.16 W	PHMN_Torque_x
Copper losses (Calculated)	290.156 W	Pcopper
Copper losses (Torque)	290.156 W	PcopperN_Torque_x
Eddy current losses (Torque)	7.11651 W	PeddyN_Torque_x
Generator efficiency (Torque)	0.738757	efftotalN_Torque_x
Generator efficiency (Calculated)	0.726441	efficiency_real
AC Power at the rectifier (Calculated)	758.841 W	Pnom_rect
AC Power at the rectifier (Torque)	789.197 W	PelN_Torque_x_rect
DC Power at the batteries (Calculated)	682.957 W	Pnom_dc
DC Power at the batteries (Torque)	710.277 W	PelN_Torque_x_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)	12.8168 W	Prot
Rotational losses (Torque)	12.8168 W	ProtN_Torque_x

Costs, Mass and Volume
Property	Value	Variable name
Total generator cost	348.136 EUR	Totalcost
Total generator mass	17.2229 kgr	TotalMass
Total generator volume	3.72986 dm3	TotalVolume
Blade rotor mass	0.412897 kgr	blade_rotor_mass
Softwood density	500 kgr/m³	softwood_density
Cost of magnets	191.204 EUR	Magcost
Magnet shipping cost	13.4029 EUR	shippingcost
Copper mass	4.38914 kgr	mcu
Cost of copper	64.7837 EUR	coppercost
Resin mass	2.13716 kgr	resinmass
Cost of resin	29.5204 EUR	resincost
Resin volume	1571.44 cm3	ResinVolume
Total mass of one generator rotor	5.34832 kgr	TotalMassRotor
Cost of iron	11.1094 EUR	ironcost
Surface area of moulds	0.325241 m2	woodS
Total cost of moulds	51.5182 EUR	woodcost

Revolutions per minute (RPM)
0
86.493562
172.987124
259.480685
345.974247
432.467809

I_RMS (A)
0
4.978602
9.957205
14.935807
19.914409
24.893012

Output files

Octave/Matlab variable file:

simulation-6393.mat

Input parameters

Blade Rotor Inputs

Turbine radius:

0.60m

Aerodynamic coefficient:

0.50

Cut-in wind speed:

3.00m/s

Nominal wind speed:

15.00m/s

Cut-in TSR:

6.00

Design TSR:

11.00

Air density:

1.220kg/m³

Generator Rotor Inputs

AFPM rotor topology:

Double Rotor

Magnetic material:

NdFeB N52

Number of generator poles:

Magnet length:

34mm

Magnet width:

34mm

Magnet thickness:

12mm

Rotor disk thickness:

Calculated

Mechanical clearance:

3.00mm

Generator Stator Inputs

Select coil type:

Keyhole

Winding fill factor:

Calculated

Stator thickness:

Calculated

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:

true

Simulation step:

Current step:

RPM Step:

Mesh size:

Automesh

Constants

Copper resistivity:

1.678E-8 Ω·m

Copper density:

8.94g/cm³

Iron density:

7.87g/cm³

Resin density:

1.36g/cm³