thesis 2 | Online Design Tools for Locally Manufactured Small Wind Turbines

Submitted by Felrin floyd on Sun, 26/04/2020 - 05:46

Duration:

00:07:02

Tabs

Results

Blade Rotor Outputs
Property	Value	Variable name
RPM at the cut-in wind speed (TSR)	417.994 RPM	n_cut_in
RPM at the nominal wind speed (TSR)	1050.96 RPM	n_nom
Nominal tip speed ratio	4.4	tsr_nom
Mechanical power (Torque)	498.09 W	Pmech_Torque_x

Generator Rotor Outputs
Property	Value	Variable name
Rotor disk thickness	10 mm	hr
Magnet width-to-pole pitch ratio	0.456165	ai
Inner-to-outer magnet radius	0.696158	kd
Flux density in airgap	0.11635 T	Bmax
Flux density on magnet surface	0.326458 T	Bmg
First harmonic of flux density in airgap	0.0960913 T	Bp
Flux per pole (Calculated)	0.000482041 Wb	Flux_pole
Magnets on a rotor disk	8	magnet_num
Distance between magnets	30.3807 mm	dist_magnet_Rin
Magnet mass	1039.68 g	MagnetMass
Magnet density	7.5 g/cm3	mag_density
Volume of a single magnet	8664 mm3	Vmag
Volume of all magnets	138624 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	253 mm	Dout
Average radius	106.065 mm	Ravg
Inner radius	87.065 mm	Rin
Outer radius	126.5 mm	Rout
Effective outer radius	125.065 mm	Rout_eff
Mass of rotor disks	3.95645 kgr	BackIronMass
Volume of rotor disks	502.726 cm3	BackIronVolume
Maximum flux density in the magnet rotor disk	0.72082 T	SaturMAX
Is the magnet rotor disk saturated?	No	Saturation

Generator Stator Outputs
Property	Value	Variable name
Stator thickness	35 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	69	Nc
Copper wire diameter	1.63 mm	dc
Number of wires at hand	2	No_wires_at_hand
Winding fill factor	0.55	kf
Copper wire cross-sectional area	4.17345 mm2	sc
Copper wire diameter (Calculated)	2.30517 mm	dc_theor
Coil leg width	21 mm	wc
Average length of coil turn	243.437 mm	lavg
Stator nominal temperature	57.7 C°	tc_real
Stator surface area	613.462 cm²	stator_surface_area
Heat coefficient	0.174868	cq_real
Current density	4.31298 A	Jmax_real
Resistivity of copper at nominal temperature	1.92472E-8 Ohm.m	pt
Resistance of a single coil	0.0774655 Ohm	Rc
Phase resistance	0.154931 Ohm	Rphase
Phase inductance	0.000603001 H	Ls
Nagaoka constant	0.37401	Kn
Volume of a single coil	178927 mm3	coil_volume
Weight of a single coil	644.879 g	coil_weight_constr
Coil hole at Ravg	68.571 mm	coil_hole_Ravg
Coil hole at Rin	48.0428 mm	coil_hole_Rin_constr
Coil hole at Rout	86.6348 mm	coil_hole_Rout_constr
Coil mass for construction	4.51415 kgr	mcu_constr
RMS flux linkage of phase A	0.0112204 Wb	FluxRmsA
RMS flux linkage of phase B	0.0110325 Wb	FluxRmsB
RMS flux linkage of phase C	0.01109 Wb	FluxRmsC
EMF at the cut-in wind speed (Calculated)	10.264 V	EMF_cut_in
EMF at the nominal wind speed (Calculated)	25.8066 V	EMF_nom
RMS of EMF of phase A (Flux Linkage)	9.88064 V	V_rmsA
RMS of EMF of phase B (Flux Linkage)	9.97973 V	V_rmsB
RMS of EMF of phase C (Flux Linkage)	9.90555 V	V_rmsC
Current at the nominal wind speed	18 A	Iac_nom
Nominal frequency	70.0637 Hz	fnom
Generator power (Torque)	326.306 W	PelN_Torque_x
Electromagnetic power (Torque)	478.926 W	PHMN_Torque_x
Copper losses (Torque)	150.593 W	PcopperN_Torque_x
Eddy current losses (Torque)	2.02727 W	PeddyN_Torque_x
Generator efficiency (Torque)	0.655114	efftotalN_Torque_x
AC Power at the rectifier (Torque)	293.675 W	PelN_Torque_x_rect
DC Power at the batteries (Torque)	264.308 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 (Torque)	19.1645 W	ProtN_Torque_x

Costs, Mass and Volume
Property	Value	Variable name
Total generator cost	300.868 EUR	Totalcost
Total generator mass	13.9913 kgr	TotalMass
Total generator volume	2.71472 dm3	TotalVolume
Blade rotor mass	0.412897 kgr	blade_rotor_mass
Softwood density	500 kgr/m³	softwood_density
Cost of magnets	119.751 EUR	Magcost
Magnet shipping cost	8.37101 EUR	shippingcost
Copper mass	3.76028 kgr	mcu
Cost of copper	55.5017 EUR	coppercost
Resin mass	5.23486 kgr	resinmass
Cost of resin	72.3086 EUR	resincost
Resin volume	3849.16 cm3	ResinVolume
Total mass of one generator rotor	4.99613 kgr	TotalMassRotor
Cost of iron	4.86643 EUR	ironcost
Surface area of moulds	0.305809 m2	woodS
Total cost of moulds	48.4401 EUR	woodcost

Revolutions per minute (RPM)
0
1050.955414

I_RMS (A)
0
18

Output files

Octave/Matlab variable file:

simulation-6321.mat

Input parameters

Blade Rotor Inputs

Turbine radius:

0.60m

Cut-in wind speed:

3.00m/s

Nominal wind speed:

15.00m/s

Cut-in TSR:

8.75

Nominal TSR:

4.40

Air density:

1.220kg/m³

Generator Rotor Inputs

AFPM rotor topology:

Single Rotor

Outer diameter:

253.00mm

Magnetic material:

NdFeB N52

Number of generator poles:

Magnet length:

38mm

Magnet width:

38mm

Magnet thickness:

6mm

Rotor disk thickness:

10mm

Mechanical clearance:

3.00mm

Generator Stator Inputs

Select coil type:

Keyhole

Winding fill factor:

0.55

Current at nominal wind speed:

18.00A

Stator thickness:

35mm

Number of turns per coil:

Copper wire diameter:

1.63mm

Number of wires at hand:

Coil leg width:

21mm

Stator nominal temperature:

57.70C°

System Inputs

System 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

Simulation Radius:

Average radius

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