Phase Converter Buzzing
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  1. #1
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    Default Phase Converter Buzzing

    I've just finished putting together a 10HP phase converter using an American Rotary panel and a self supplied idler motor. The idler motor is making a buzzing noise when there's no load on the circuit. As soon as I apply a load it goes away. See the video in the link below.

    VID_20200601_113019_LS.mp4 - Google Drive

    American Rotary support was great until they realized I was using my own idler motor, then they told me to buzz off (ha). Below are the voltage readings between legs.

    Loaded__________Unloaded
    L1-L2: 238_______L1-L2: 239
    L1-L3: 233_______L1-L3: 250
    L2-L3: 230_______L2-L3: 232


    Does anyone have any idea what's causing this and how I can resolve it? Thanks in advance!

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    Quote Originally Posted by Grenade View Post
    I've just finished putting together a 10HP phase converter using an American Rotary panel and a self supplied idler motor. The idler motor is making a buzzing noise when there's no load on the circuit. As soon as I apply a load it goes away. See the video in the link below.

    VID_20200601_113019_LS.mp4 - Google Drive

    American Rotary support was great until they realized I was using my own idler motor, then they told me to buzz off (ha). Below are the voltage readings between legs.

    Loaded__________Unloaded
    L1-L2: 238_______L1-L2: 239
    L1-L3: 233_______L1-L3: 250
    L2-L3: 230_______L2-L3: 232


    Does anyone have any idea what's causing this and how I can resolve it? Thanks in advance!
    remove some of the run capacitors until you see that 250 volt number drop a bit, or just ignore it. 250 volts no load is not too high.

    you can then take those capacitors which were removed and move them to the load so they are only switched in when the load is turned on.

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    Quote Originally Posted by johansen View Post
    remove some of the run capacitors until you see that 250 volt number drop a bit, or just ignore it. 250 volts no load is not too high.

    you can then take those capacitors which were removed and move them to the load so they are only switched in when the load is turned on.
    I'll give it a shot. Is it likely high voltage on one leg is causing the buzzing problem I'm experiencing?

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    motors buzz because the core is saturated and the magnetic field is escaping the stator core and causing the rest of the motor casing to vibrate.. typically sheet metal.

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    [QUOTE=johansen;3560855]remove some of the run capacitors until you see that 250 volt number drop a bit, or just ignore it. 250 volts no load is not too high.

    you can then take those capacitors which were removed and move them to the load so they are only switched in when the load is turned on.[/QUOT

    Interesting !! Caps in the load. All three phases?? Or just generated phase?


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