[Amps] What is the meaning of ACVFD ?

[Carl]

A 10 HP or higher 3 phase motor and a couple of surplus utility company 
phasing capacitors is the working mans way to tackle it.

Since I dont run that much big 3 phase tools and only one at a time, a 7.5 
HP "idler" motor has been used for over 20 years, it draws negligible power 
to run. The motor cost $50 and the caps were $5 each. There is a surplus of 
3 phase motors these days and the cost would likely be scrap value if you 
shop around.

Carl
KM1H



----- Original Message ----- 
From: "Roger (sub1)" <sub1 at rogerhalstead.com>
To: <amps at contesting.com>
Sent: Saturday, July 02, 2011 6:33 PM
Subject: Re: [Amps] What is the meaning of ACVFD ?


> On 7/2/2011 3:17 PM, Paul Kraemer wrote:
>> AC Variable Frequency Drive
>> An electronic motor control that rectifies incoming line voltage (single 
>> or
>> 3 phase) to provide a dc buss voltage (approximately 350vdc for a 230vac
>> drive) which is supplied to a "six pack" array of power devices 
>> (transistors
>> or fets) which is controlled by microprocessor to synthesize a pwm 3 
>> phase
>> output to a motor.
>
> I've been told not depend on the solid state 3 phase converters to run
> much of a motor.  When you get up to a lathe or mill a rotary converter
> works much better and of course costs many times more. <sigh>   For a 7
> HP lathe it takes a 15 to 20 HP rotary converter. (run 2 to 3 times the
> rating of the load)  Too bad too as the solid state converter is a few
> hundred dollars while the rotary converter is $2,000 or more.
>
> 73
>
> Roger (K8RI)
>> Paul K0UYA
>> ----- Original Message -----
>> From:<pdussertvidalet at free.fr>
>> To:<amps at contesting.com>
>> Sent: Friday, July 01, 2011 11:44 PM
>> Subject: [Amps] What is the meaning of ACVFD ?
>>
>>
>>>
>>> What is the meaning of the acronym ACVFD ? Message 1 , vol 103 , from 
>>> Paul
>>> Kouya
>>> .
>>> How can I connect a one phase transformer , 230 volts , on a three 
>>> phases
>>> main
>>> using the three phases to split the power between them ? 73 from Pierre 
>>> /
>>> F8GY .
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>
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