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Inverters

Discussion in 'Power Electronics' started by homesman, Feb 11, 2018.

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  1. homesman

    homesman

    1
    0
    Feb 11, 2018
    I have bought a 1/2hp 90vac 1ph motor on ebay. My need is to convert 12vdc to the 90vac, but am having trouble fining a inverter that will invert to 90. Will a inverter that does invert to 110vac work with this 90vac, or do I need to send this motor back?
     
    Last edited by a moderator: Feb 11, 2018
  2. Hopup

    Hopup

    253
    36
    Jul 5, 2015
    You can reduce the voltage using variac. They are widely available on Ebay and other sites.
     
  3. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    A 20V transformer can be used to subtract 20V from the invertor output.
    The motor may not like a non sine supply. What does your invertor supply?
     
  4. flippineck

    flippineck

    269
    9
    Sep 8, 2013
    Watch out as well for the cheaper inverters that claim a certain power rating but fail to deliver it for a number of reasons.

    I bought one from a Chinese Ebay supplier that claimed '3000W / 6000W peak' but in practise it only seems to be able to reliably cope with much less. Connecting a 2400W kettle causes it to go into instant overload protection. I only use it to run the LED lighting in my caravan now. I resorted to a diesel generator for the kettle etc.

    I understand many types of load classed as 'inductive' (some motors, fluorescent tube ballasts etc) take a much higher current than normal for a few seconds on start-up, such that you might need an inverter with a rating much, much higher than the appliance's normal constant running rating in order to get it started reliably.

    I might be wrong but I think there's a technology called 'soft start' on some inverters that tries to cope with inductive loads by slowly ramping up the output on load connection, so there isn't so bad of a sudden current rush
     
  5. JWHassler

    JWHassler

    78
    16
    Dec 22, 2014
    Where did you get a 90 volt AC motor?
    Ninety volts DC is very common
     
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