servo motor drive 3 phase

[Guy S.]

I am considering to purchase a used industrial equipment running on 3
phase current.it`s a old industrial robot with servo motors
i do not receive 3 phase current from the Hydro-electric company.
before buying a phase converter, it is more expenses and i think that
(perhaps it`s not needed!!)
i consider this
When i look at the schematic i realise that the electronic drive
section
receive 200 volt dc, somehow the 3 phases are blended .
then the drive redistribute 3 phase to the motor,through some powerfull
FET transistor, there is 6 of them bridged by 3 gang of 2.
my question is:
do the motor drive need 3 phases input to output 3 phases?
can i connect the input transfo of the controller to a single phase
current and let the drive somehow build it`s own 3 phases output?

thanks for your help
Guy

 

[Jamie]

I am considering to purchase a used industrial equipment running on 3
phase current.it`s a old industrial robot with servo motors
i do not receive 3 phase current from the Hydro-electric company.
before buying a phase converter, it is more expenses and i think that
(perhaps it`s not needed!!)
i consider this
When i look at the schematic i realise that the electronic drive
section
receive 200 volt dc, somehow the 3 phases are blended .
then the drive redistribute 3 phase to the motor,through some powerfull
FET transistor, there is 6 of them bridged by 3 gang of 2.
my question is:
do the motor drive need 3 phases input to output 3 phases?
can i connect the input transfo of the controller to a single phase
current and let the drive somehow build it`s own 3 phases output?

thanks for your help
Guy

find your self an old high output 3 phase motor.
connect a small single phase motor to get it started
on the shaft, connect L1 and L2 to T1 and T2 of
the 3 phase motor and use T3 as your third phase from
the motor to your shop.

wait for the motor to get spinning from the little
single phase, once you get it going i think you can
turn off the little single phase starter motor.
its been years since i have done this but i think that
is how we use to do it on the farm out in the garage.
this maybe a cheaper way to get 3 phase.

 

[Paul E. Schoen]

I am considering to purchase a used industrial equipment running on 3
phase current.it`s a old industrial robot with servo motors
i do not receive 3 phase current from the Hydro-electric company.
before buying a phase converter, it is more expenses and i think that
(perhaps it`s not needed!!)
i consider this
When i look at the schematic i realise that the electronic drive
section
receive 200 volt dc, somehow the 3 phases are blended .
then the drive redistribute 3 phase to the motor,through some powerfull
FET transistor, there is 6 of them bridged by 3 gang of 2.
my question is:
do the motor drive need 3 phases input to output 3 phases?
can i connect the input transfo of the controller to a single phase
current and let the drive somehow build it`s own 3 phases output?

thanks for your help
Guy

VF PWM motor controllers use a DC "bridge" which is about 360 VDC for 240
VAC, and 720 VDC for 480 VAC. If you can generate the required DC voltage,
you can bypass the input rectifiers. I bought a GE/Fuji 2 HP drive and I
power it on 240 VAC single phase. It is rated at only 1 HP under these
conditions, but it would probably work at full power by adding a large
capacitor on the DC bridge terminals. However, the charging current might
exceed the ratings of the input rectifiers.

Paul

 

[Ignoramus16643]

I am considering to purchase a used industrial equipment running on 3
phase current.it`s a old industrial robot with servo motors
i do not receive 3 phase current from the Hydro-electric company.
before buying a phase converter, it is more expenses and i think that
(perhaps it`s not needed!!)
i consider this
When i look at the schematic i realise that the electronic drive
section
receive 200 volt dc, somehow the 3 phases are blended .
then the drive redistribute 3 phase to the motor,through some powerfull
FET transistor, there is 6 of them bridged by 3 gang of 2.
my question is:
do the motor drive need 3 phases input to output 3 phases?
can i connect the input transfo of the controller to a single phase
current and let the drive somehow build it`s own 3 phases output?

Guy, making a phase converter is a project that can be done for very
little money in a couple of evenings. Then you can save a lot of money
on all kinds of cheap, high quality three phase equipment.

i

 

[Bobo The Chimp]

On Tue, 23 May 2006 22:00:51 -0700, Jamie wrote:

Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

What's that? Take pictures of your 300-lb girlfriend in her underpants?

Yech!

 

[Jamie]

On Tue, 23 May 2006 22:00:51 -0700, Jamie wrote:

Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

What's that? Take pictures of your 300-lb girlfriend in her underpants?

Yech!

are you jealous ?

 

[Bobo The Chimp]

are you jealous ?

No - Nauseous.

Thanks,
Bobo