Solar Power Cube v17.10: Difference between revisions
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===Pulley and Belt Sizing=== | ===Pulley and Belt Sizing=== | ||
The RPM of the electric motor is 450 RPM at 36VDC and must drive the pulley on the hydraulic pump at 280 RPM, so the ratio of pulleys is 248:450 or roughly 5:9, with | The RPM of the electric motor is 450 RPM at 36VDC and must drive the pulley on the hydraulic pump at 280 RPM, so the ratio of pulleys is 248:450 or roughly 5:9, with . | ||
The larger pulley goes on the pump and the smaller on the electric motor. | |||
The shaft on the electric motor is 13/16" and the shaft on the pump is 1/2". | The shaft on the electric motor is 13/16" and the shaft on the pump is 1/2". | ||
Revision as of 02:22, 4 October 2017
The solar power cube is driven by a solar panel to pump hydraulic fluid with the initial purpose of powering an autonomous tractor for agricultural use.
Specifications
Solar Panel
STC Power Rating 290W PTC Power Rating 263.07W 1 STC Power per unit of area 13.8W/ft2 (148.2W/m2) Peak Efficiency 14.82% Power Tolerances -3%/+3% Number of Cells 72 Nominal Voltage not applicable Imp 8.02A Vmp 36.4V Dimensions: 77.6in (1,972mm) x 39.1in (992mm) x 1.6in (40mm) Weight: 50.7lb (23kg) Hanwha Solar Panel
DC Motor and Controller
450W 36 V DC electric motor MY1020z gear reduction Input Voltage: 36 V Base RPM: 450 Wires: 12 Gauge Efficiency: 78% Full Load Amps: 16 Current Type: DC Gear Ratio: 6.67:1 Shaft Diameter: 20 mm (13/16") Reversible EBAY MY1020z $67.05
PWM Motor Speed Controls DC 36V DC Gear Motor Speed Controller Input voltage: DC9-60V Output voltage: Linear load Output current: 0-20A Continuous power: 12600W Speed mode: potentiometer (linear) Speed range: 0-100% Control frequency: 25KHZ Forward reversal: support Suitable for motor: DC brush Pot mounting hole: 7mm Product size: approx. 92*50*36mm/3.62*1.96*1.41 Net weight: approx. 145g Center distance: approx. 104mm EBAY $10.99
Hydraulic Power Unit
Power 5 HP 3600 RPM Flow 2 GPM max. Pressure 2500 PSI max. Reservoir 1.1 gallons Shaft 1/2" dia. x 7/8" w/keyway Rotation CW Ports 3/8" NPT pressure Return 3/8" & 3/4" NPT Orientation Vertical Size 10" x 10" x 10" Shpg. 13 lbs. Surplus Center Hydraulic Power Unit $109.95
Timing Belt and Pulleys
File:PC17.10-Timig-Pulleys.png Timing Belt
Hydraulic Motor (for reference)
31.88 cubic inch / revolution
SAE 10 ports
SAE 4 case drain
Calculations
Power
Max Motor Input: 290 W * 78% * 100 = 226.2 Watts Motor Output: 226 W / (746 W/HP) = 0.303 HP Motor Torque @ 450 RPM = 4.54 ft-lb Torque (ft-lb) = (HP * 33000) / (2 * pi * rotational speed) = (.303 * 33000) / (2 * 3.14159 * 450) = 3.54 ft-lbs Torque (NM) = Watts / (2 * pi * rotational speed) = 226 W / (2 * 3.14159 * 450 RPM) = 0.08 NM This will be used to determine pulley and belt specs
RPM input/output
Max motor RPM: 450 Max Hydraulic Pump RPM: 3600 Max Hydraulic Motor RPM: 240 Estimated Max Wheel RPM: 1
Hydraulic Fluid Flow
GPM required for 1 RPM @wheel: 31.88 cu in/min or 31.88 / 231 = 0.138 GPM Max Pump Output: 2 GPM @ 3600 RPM => Pump CIPR = (2 GPM * 231 cu in/Gal) / 3600 RPM = 0.128 CIPR (Cubic Inches Per Revolution) RPM required from pump for 0.138 GPM output: (0.138 GPM * 231 cu in/Gal) / 0.128 CIPR = 248 RPM
Pulley and Belt Sizing
The RPM of the electric motor is 450 RPM at 36VDC and must drive the pulley on the hydraulic pump at 280 RPM, so the ratio of pulleys is 248:450 or roughly 5:9, with .
The larger pulley goes on the pump and the smaller on the electric motor. The shaft on the electric motor is 13/16" and the shaft on the pump is 1/2".
Power Cube Working Document
["https://docs.google.com/spreadsheets/d/1KNVP2O3KogC6jyxMuRALWTxrYjyCJ4ChjeZsJVdqHsg/edit#gid=1"]