ECE 3072 Lab 1 Report - ECE 3072 Lab 1 Page 1 of 13 Human...

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ECE 3072 Lab 1 Page 1 of 13 Human Powered Generator ECE 3072 L08 Section Jack Zhang Due Date: 09/17/2015
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ECE 3072 Lab 1 Page 2 of 13 LAB 1 - Human Powered Generator Procedure: Measuring No-load Characteristics 1. Measure the stator resistance of the DC motor using an Agilent digital multimeter. Disconnect belt from pulley on motor shaft. Connect motor to the adjustable DC source on Lab volt equipment, and connect the circuit shown in Error: Reference source not found. HAVE THE TA CHECK YOUR CIRCUIT BEFORE TURNING ON THE POWER. Set the appropriate measurement range based on motor shaft speed. Open LVDAM-EMS on computer and open the Meter tool. Stator resistance of the DC motor 0.390 Ω . 2. Set the voltage on the Labvolt power supply to 4V. Record output of the tachometer from multimeter and record motor voltage and current. Repeat measurements for 4V through 24V in 4V increments. Table 1. Current, voltage and speed measurements of a DC motor no-load test. Current Voltage Speed 4V 0.631 4.185 60.00 8V 0.796 8.076 119.80 12V 0.907 12.21 180.75 16V 0.925 16.12 246.82 20V 0.967 20.29 311.02 24V 1.025 24.08 368.09 Measuring Armature Resistance using Oscilloscope 3. Disconnect the motor output from Labvolt setup and connect to load box. Re-connect belt to pulley on motor-shaft. Connect Channel 1 of the oscilloscope to the voltage measurement ports on the load box, and connect Channel 2 to current measurement ports. Set the HP power supply to +/- 15V, and connect to appropriate terminals on load box. 4. Set scope trigger mode to normal, set trigger source to channel 2, set trigger level to 1V, set Channel 1 to 5V/division, set Channel 2 to 1 V/div, set time/division to 1 ms/div. 5. Turn all loads off, and then pedal the bicycle so that the meter on the handlebar reads 12V. the single sequence trigger and switch on the 50W incandescent bulb. The turn- on transient should be recorded. Use the cursors on the oscilloscope to measure the voltage before the lamp is switched on, and the voltage and current immediately after, as seen in Error: Reference source not found.
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ECE 3072 Lab 1 Page 3 of 13 Load Tests 6. Turn on the 50W bulbs, and pedal slowly (V a ≈ 6V). Record voltage, current and speed measurements. Pedal faster and repeat measurements. Do this for a total of 4 different speeds. Table 2. Current, voltage and speed measurements of a generator with a 50W load. Current Voltage Speed Speed 1 5.10 6.20 124.62 Speed 2 5.70 8.10 185.67 Speed 3 6.30 10.10 221.06 Speed 4 7.10 12.02 259.70 7. Measure voltage and current when pedaling with the following different bulb combinations: 1) one 50W & one 100W bulb, and 2) 50W’s & two 100W bulbs. Table 3. Current, voltage and speed measurements of a generator with a 150W load. Current Voltage Speed Speed 1 8.00 6.00 133.62 Speed 2 9.10 8.10 200.75 Speed 3 11.00 11.00 235.83 Speed 4 12.00 12.00 283.79 Table 4. Current, voltage and speed measurements of a generator with a 250W load.
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