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I have this motor (Samsung Electronics SMV-260UA) diagram and a 10 μF capacitor from a salvaged microwave:

wiring schematic cap

I've experimented with supplying power, but I need start up current to kick the motor into action. I found a capacitor I believe is correctly rated.

This will be connected to an AC switch (toggle) and have a hot, ground, and neutral available. The capacitor should go where the C is in the diagram. But what is the correct wiring from the switch to make sure this is properly wired? The motor cord has purple, white, blue, orange and red wires.

full motor cord
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    \$\begingroup\$ Keep (protective) earth connected all the time. Switch hot. Where possible, switch neutral, too. I'm a bit confused to see both H and L drawn as connected. (Is that a blower?) \$\endgroup\$
    – greybeard
    Dec 16, 2022 at 5:51
  • \$\begingroup\$ Yes, it's a fan from a microwave. \$\endgroup\$ Dec 16, 2022 at 5:53
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    \$\begingroup\$ H and L are probably windings 180° apart... \$\endgroup\$
    – kruemi
    Dec 16, 2022 at 7:04
  • \$\begingroup\$ I note that your motor says 1.25 A while your capacitor says 0.83 A. \$\endgroup\$
    – jonathanjo
    Dec 16, 2022 at 7:44
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    \$\begingroup\$ [motor current 1,25 A, capacitor .85 A] is a problem correct? No. In all likelihood, motor current is specified through all of 2-3 windings, but the current through the main/ run winding doesn't flow through the capacitor (as does that through auxiliary/ start windings). \$\endgroup\$
    – greybeard
    Dec 16, 2022 at 15:19

1 Answer 1

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Here's the schematic which is self explanatory.

enter image description here

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  • \$\begingroup\$ Are L and H exclusive or are they both connected at the same time for high speed? \$\endgroup\$
    – kruemi
    Dec 16, 2022 at 8:22
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    \$\begingroup\$ I'd recommend switching neutral as well. \$\endgroup\$
    – jonathanjo
    Dec 16, 2022 at 8:26
  • \$\begingroup\$ @kruemi - Hi, Only 'Lo' for low speed and only 'Hi' for high speed. \$\endgroup\$
    – vu2nan
    Dec 16, 2022 at 8:30
  • \$\begingroup\$ @vu2nan It looks to me like you connect L and H at the same time, per the diagram in the motor photo. I'm sure you're right that connecting one of them would work, but I'll guess that one at a time is low speed, both connected gives high speed. \$\endgroup\$
    – jonathanjo
    Dec 16, 2022 at 8:55
  • \$\begingroup\$ @jonathanjo - Hi, Please check this out diyforums.net/microwave-fan-motor-wiring-137312.html. \$\endgroup\$
    – vu2nan
    Dec 16, 2022 at 11:17

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