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I was trying to make a generator out of a DC motor inrunner by following this video by following this schematic: 1 enter image description here

I made this structure and started testing the phase voltages. A-, B+, C- are combined together and made as the neutral wire. enter image description here

While testing the voltage outputs from A_neutral, B_neutral, C_neutral, V_ab, V_bc and V_ac, I am getting non-uniform outputs and I am getting problems troubleshooting this issue.

Voltage_cb

Voltage_cb

Voltage_ab

Voltage_ab

Voltage_ac

Voltage_ac

Voltage_a_with_neutral

Voltage_a_with_neutral

Voltage_b_with_neutral

Voltage_b_with_neutral

Voltage_c_with_neutral (almost no voltage, dont know why)

Voltage_c_with_neutral (almost no voltage, dont know why)

Why is the voltage_cneutral almost nil compared to the other voltages? I checked the copper coil winding and they are all same.

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  • \$\begingroup\$ Most of us won't watch a video link. (1) Add a schematic using the button on the editor toolbar. (2) Explain what "inrunner" means. (I never heard of it.) (3) Explain the change in voltage on the a-N trace. \$\endgroup\$
    – Transistor
    Commented Aug 3, 2016 at 7:14
  • \$\begingroup\$ Thanks, I have updated. Although I am not ale to explain the change in the voltage on the a-N trace, I was moving around the wires for adjustment which caused a big surge. I still have not understood. \$\endgroup\$
    – shadesofpurplegreen
    Commented Aug 3, 2016 at 7:20
  • \$\begingroup\$ You don't have a neutral, you don't need a neutral. Where did your neutral come from??? Maybe your neutral is the problem?? You only need to rectify the 3 phases with 6 diodes, no neutral in sight. Look up '3 phase full wave recitifier'. \$\endgroup\$
    – Neil_UK
    Commented Aug 3, 2016 at 7:23
  • \$\begingroup\$ (1) You still haven't explained "inrunner". (2) There is no neutral on those wiring diagrams. \$\endgroup\$
    – Transistor
    Commented Aug 3, 2016 at 7:24
  • \$\begingroup\$ @Neil_UK A-, B+ and C- are soldered together and made as neutral \$\endgroup\$
    – shadesofpurplegreen
    Commented Aug 3, 2016 at 7:33

1 Answer 1

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It seems like you have a loose connection somewhere. With magnet wire, you need to carefully scrape the varnish off the surface of the wires, twist them together and solder them. The voltage A to neutral trace shows the voltage jumping up and down. That must be the result of a loose connection. The scope patterns seem to be inconsistent with one another. It appears that moving the scope probes may move the wires so that the connections change.

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  • \$\begingroup\$ I found the problem, it was giving inconsistent output because of main line interference similar to this. \$\endgroup\$
    – shadesofpurplegreen
    Commented Aug 4, 2016 at 10:25

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