Bedini monopole 3 group experiment


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Bedini monopole 3 group experiment

  1. 1. Bedini Monopole 3 Group Experiment1 OverviewBedini Monopole 3 group memberscan meet the group’s learning goals bybuilding and testing a John BediniMonopole Mechanical Oscillatoraccording to the circuit shown here.A new plastic BMX bicycle wheelmounted in a study wood supportstructure is recommended; however:you may use your own design.• What happens to the charging battery?• What does the meter indicate going into the battery?• What do we get out of the battery on a repeated basis?Do as many presentations as you wishto help in this project.2 Step by Step Instructions2.1 Safety FirstFlying magnets are dangerous. Wrap fiberglass filament tape around the circumference ofyour wheel to restrain the magnets. This safety measure is in addition to regular gluing ofthe magnets.Lead-acid batteries contain a diluted sulfuric acid electrolyte, which is a highly corrosiveand poisonous.When working with batteries, wear safety goggles, protective clothing and have plenty ofventilation, remove your jewelry, and exercise caution.Wash you hands after contact with batteries. Neutralize spilled acid with baking soda.2.2 Assemble and Test Basic UnitAfter you have obtained your parts from either the kit or sources indicated in the parts list,construct the basic unit.Connect the batteries and verify the unit runs.See the message area for Troubleshooting information.Copyright BM3 Group Page 1 of 5 Version 0.03 3
  2. 2. Bedini Monopole 3 Group Experiment2.3 TuningTune for the highest wheel speed for supply battery current. This is reported in Magnets perMinute per milliamp of supply battery current (mpmA).2.4 Measure Output Current to BatteryThe best way is to use an analog current meter in series with the charge battery. If you use adigital current meter, average the readings.Do not leave the current meter permanently connected as it reduces charge rate.2.5 COP TestingBatteries do not charge or discharge exactly as people expect. Repeated load testing helpsyou understand the complexities of batteries. The best way to measure how much energy abattery has is to measure how much work it can do via a load test.Copyright BM3 Group Page 2 of 5 Version 0.03 3
  3. 3. Bedini Monopole 3 Group ExperimentThe Battery’s Coefficient Of Performance (COP) is calculated from these load tests. Tabulatedata for each charging/discharge test as shown in the example below.Table 1 : Discharge Results Intial Final Charge Charge Time Battery Load Battery Input to SystemRun Voltage Voltage Amps Joules Start End Hours Watts Mins Joules COP Volts Amps Joules 1 12.25 12.92 0.036 18,865 19 50 07 24 11.57 15.63 20 18,756 0.994 13.22 0.160 88,077 2 12.31 12.89 0.036 20,875 18 35 07 22 12.78 15.63 20 18,756 0.899 13.22 0.160 97,342 3 12.24 12.94 0.036 20,477 18 00 06 33 12.55 15.63 20 18,756 0.916 13.22 0.160 95,565 4 12.30 13.00 0.036 17,925 22 45 09 41 10.93 15.63 26 24,383 1.360 13.22 0.160 83,254 5 12.26 12.93 0.036 20,404 12 20 00 50 12.50 15.63 26 24,383 1.195 13.22 0.160 95,184 6 12.29 12.97 0.036 19,779 08 30 20 35 12.08 15.63 32 30,010 1.517 13.22 0.160 92,011 Run The number of the charge/discharge cycle Initial Voltage The voltage of battery at beginning of charging Final Voltage The voltage of the battery at end of charging Charge Amps The measured charge rate in amperes from section 2.4 Charge Joules The energy put into the battery in joules Start Time Time battery charging started End Time Time battery charging ended Hours Duration of charge (End Time – Start Time) Battery Load Watts Value in watts of discharge rate Battery Load Minutes Duration of battery discharge in minutes Battery Load Joules Energy obtained from battery discharge in joules Battery COP Ratio of Battery Load Joules and Charge joules Input to System Volts Average voltage of input to SSG Input to System Amps Average input current to SSG in amperes Input to System Joules Energy input to system in joulesThree of the above values are calculated from the collected data. • Charge Joules is the result of average Initial Voltage and Final Voltage x Charge Amps x Hours x 3600. • Hours is End Time - Start Time in hours. • Battery Load Joules is Discharge Rate x Hours x 3600.Copyright BM3 Group Page 3 of 5 Version 0.03 3
  4. 4. Bedini Monopole 3 Group Experiment2.6 Selecting a Lead-Acid Battery for TestingThe size and condition of the battery you use will affect the times required for charging anddischarging cycles.For the SSG to be most effective, the battery must be conditioned by about 20 to 30charge/discharge cycles. Old batteries go through a desulfating process at first which is slow,thus a brand new battery is recommended.For quicker results, select a 3 to 7 amp hour (Ah) battery.For a battery rated in cranking amperes divide by 20 to get the approximate amp hour rating.Lead-Acid batteries come in Sealed (SLA), Valve Regulated (VR), deep cycle, flooded andmany other constructions. We recommend flooded construction as it gives better results.2.7 The Charging ProcessThe charging process is usually stopped after a predetermined voltage is reached or a fixedamount of time. See section 2.9 for determining terminal voltage and/or time duration to use.2.8 The Discharge ProcessRest the battery a minimum of one hour before discharging. The charging process can continueup to 24 hours after removing it from the SSG.Batteries are rated for a 20-hour discharge. The amperage that will discharge the battery fromfull (about 12.8 volts) to empty (about 12.2 volts) in 20 hours is called the C20 rate.Discharge rates higher than C20 reduce the life of a battery.Discharging is done with a resistor of adequate power rating. It is stopped after a predeterminedlow voltage limit is reached. Use 12.2 volts or a value determined by criteria in section 2.9.Discharge times are tabulated in a spreadsheet similar to Table 1.2.9 Selecting Charge/Discharge CriteriaDepth of Discharge (DOD) is the percentage of the battery capacity removed. For maximumbattery life DOD values should be a minimum of 10% and a maximum of 50%. 10% DOD of a10 amp hour (Ah) battery removed at the C20 rate requires 2 hours. 50% DOD requires 10hours.The discharge resistor value is calculated by 12.2 volts divided by discharge current. For a 10Ahbattery discharged at the C20 rate (0.5 A) use a 24.4 ohm resistor. The minimum power rating ofthis resistor is 12.2 volts x discharge current (0.5 A) or 6.1 watts.A State of Charge (SOC) table for your particular battery is required to determine what terminalvoltage to use. Many variables such as temperature and battery construction affect the openCopyright BM3 Group Page 4 of 5 Version 0.03 3
  5. 5. Bedini Monopole 3 Group Experimentcircuit voltage measured with a digital voltmeter. Typical values for a flooded cell battery at 80degrees F (26.7 C) are: 100% - 12.65v, 75% - 12.45v, 50% - 12.24v, 25% - 12.06v and 0% -11.89.These open circuit (i.e. nothing connected to the battery) values are not terminal voltages usedfor discharge limits. Do a trial discharge to some value such as 12.5 volts. Disconnect thedischarge resistor. Measure the open circuit voltage of the battery after a few minutes. Use thisvoltage and a SOC table for your battery to determine how much battery capacity you have left.Choosing modest battery size and lower DOD values makes the testing more pleasant.Copyright BM3 Group Page 5 of 5 Version 0.03 3