Sine/modified-sine inverters

Submitted: Thursday, Jul 10, 2003 at 10:53
ThreadID: 5901 Views:2251 Replies:3 FollowUps:5
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the harmonics cause distortion and im in the us under 60hz modified sine and alarm clocks dont go well mine runs double time so it is use less under anything but true sine but as for this a small "less than" 300 watt will do. modified sine work just fine for my laptop and microwave BTW and also toaster have 1000 watt cobra inverter hope this helps
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Reply By: Kev - (Cairns,QLD) - Thursday, Jul 10, 2003 at 15:53

Thursday, Jul 10, 2003 at 15:53
Reminds me of when i was working on a oil rig and i couldn't figure why my alarm clock i took with me kept waking me at 3:00am .

Later i found out the ship ran on 220 volts phase to phase and at 60Hz.

From then on i used Battery alarm clocks !

BTW- how do you go charging batterys (torch batts ect) on a modified sine wave ?

Kev.
AnswerID: 24602

Follow Up By: Member - Wherethehellawi - Thursday, Jul 10, 2003 at 17:18

Thursday, Jul 10, 2003 at 17:18
voltage does not make a motor run faster or slower. it s actually the poles of the motor OR the frequency. 60 hertz input will make motors run faster. 50 hertz on the same motor and it runs slower.

does not matter if motor rated at 60 hz and runs on 50 or vice versa but frequency can change the harmonic noise of the motor which may be a problem. Wow! am I cute
Richard
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FollowupID: 16543

Follow Up By: Kev - (Cairns,QLD) - Thursday, Jul 10, 2003 at 17:40

Thursday, Jul 10, 2003 at 17:40
Yes the voltage does not matter but the frequency does.

I don't remember any motors in my alarm clock !

If anything i would guess the 60 Hz has upset the internal clock wave for the I.C chips. (square wave)

Either way i had trouble with the clock onboard whatever the cause.

Kev.
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FollowupID: 16545

Follow Up By: Bob Y. - Qld - Thursday, Jul 10, 2003 at 19:46

Thursday, Jul 10, 2003 at 19:46
We are generator power here, and as they are usually a bit over 50Hz, then a 240v clock isn't worth a pinch of poo - unless you like getting up at 3am, like you, Kev. battery are the go.

hooroo...
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FollowupID: 16555

Reply By: Member - Wherethehellawi - Thursday, Jul 10, 2003 at 18:13

Thursday, Jul 10, 2003 at 18:13
Qartz crystal which is also frequency based?? Wow! am I cute
Richard
AnswerID: 24616

Follow Up By: Kev - (Cairns,QLD) - Thursday, Jul 10, 2003 at 19:34

Thursday, Jul 10, 2003 at 19:34
Are you talking about hte pizzo electrical effect ?

Funny thing these crystals, they can produce a voltage and also can be used for earphone speakers. Interesting.
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FollowupID: 16550

Follow Up By: Member - Willem- Thursday, Jul 10, 2003 at 22:59

Thursday, Jul 10, 2003 at 22:59
Yes Richard...You are Cute. Coo.....Coooo...Bubs!!!!Cheers, Willem
Never a dull moment
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FollowupID: 16573

Reply By: toesis - Friday, Jul 11, 2003 at 06:26

Friday, Jul 11, 2003 at 06:26
the mottoer in your alarm clock is the sampling it uses and many cheep alarms use the 60hz freq as a ref and time from it rather than using a crystal
AnswerID: 24668

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