Re: MOT Testing

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

Antonio,
Thank you for your explanation. Someone has already beat you to it though. 
I've got it all straight now. I just hadn't read far enough in the book.
Paul
Think Positive

----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Saturday, April 30, 2005 11:51 PM
Subject: Re: MOT Testing

> Original poster: "Antonio Carlos M. de Queiroz" 
<<mailto:acmdq@xxxxxxxxxx>acmdq@xxxxxxxxxx>
>
> Tesla list wrote:
>>Original poster: "Paul B. Brodie" 
<<mailto:pbbrodie@xxxxxxxxxxxxx>pbbrodie@xxxxxxxxxxxxx>
>
>>My math background includes college calculus and I am familiar with
>>complex numbers.  I hate phasor diagrams, they give me a headache! I very
>>much understand inductive reactance. Your explanation is very difficult to
>>follow because you refer to the inductive reactance as ohms when I think
>>you are meaning henries. If you say 1 ohm of inductance, do you mean that
>>the resistance you are dealing with at the 60 Hz mains frequency for the
>>inductance of the particular inductor you have is 1 ohm? If so, then the
>>resistance is indeed 1 ohm and the 1 ohm of the resistor can be added with
>>the 1 ohm of the inductor to get 2 ohms of resistance, in this circuit at
>>this frequency.  So, if we the equation for determining the resistance of
>>an inductor, 2*pi*f*L, at mains 60 Hz, we get your 2.6mH inductor. If I
>>put that inductor in series with a 1 ohm resistor and measure the
>>resistance, I will get 2 ohms.
>
> This is not correct. Reactance is really measured in Ohms. It is
> the ratio of voltage over current for sinusoidal signals (use peak
> or rms values) for reactive impedances (inductors and capacitors).
> 1 Ohm of reactance added to 1 Ohm of resistance add as:
> Z = 1 + j, where j=sqrt(-1). This is just a representation using
> the fact that for sinusoidal signals the current in an inductor is
> always delayed by 90 degrees, that means that the current is delayed
> in relation to the voltage by the angle of the complex number (45 degrees),
> and that the absolute value of the impedance is 1.4142 (sqrt(2)) Ohms.
>
> Antonio Carlos M. de Queiroz
>
>
>