From: Robert Leguillon <[email protected]>
>To: [email protected]
>Sent: Wednesday, October 5, 2011 4:35:16 PM
>Subject: RE: [Vo]:Free Work
>
>
>/snip/
>> When the wires have nothing holding them together or apart there is no
>> opposition. In any case you do not answer my question which I will rephrase:
>> if the electricity is used to power a motor, and the same electricity is
>> used to compress or stretch a spring placed between the parallel wires, will
>> the movement of the spring slow the motor?
>>
>> BTW, You may also respond by saying "I don't know" ;)
>> Harry
>/snip/
>
>I think the correct answer is "It depends."
>
>
>But fundamentally, the same electricity cannot be doing both. It can be used
>or stored. If it is being consumed by the work performed on the spring, and
>movement of the spring allows less to be consumed, then drops total circuit
>reactance, leaving more voltage and less phase shift across the motor. If
>there is simple stored charge, the motor would (typically) have less current
>available and run slower during the intial charging time constants, and then
>speed up when the field collapses (inductive).
>
>
>So, I guess that I'll just take you up on that "I don't know."
Let's simplify the situation even more. Leave out the spring and imagine
situation where all the relevant parameters, such as conductance etc., are
chosen so the movement of the wires has a vanishingly small effect on the
performance of the motor. Now start over but this time include the spring.
Harry
