Need help with 115v/60hz to 240v/50hz.(newbie)

[ozzytim]

Hello Guys,
i'm wondering if any can help me ?
As stated i have just brought a tool(sander) from U.S it is a 115v /60hz with 9amps.it is brushless motor with a speed control
I want to use this in Australia 240v/50 hz.
I can get a transformer 2k but are concerned with the frequency. Can anyone help ?i don't want to blow this up!

Btw. some owners of this machine report motor circuit boards blowing.
Thanks tim

[Al_The_Man]

Do you have a make and model? Also do you know the motor type if it is not a Universal Motor?
Al.

[ozzytim]

Hi AL ,
thanks for the reply.All i know about the sander it is brushless and has a electronic circuit borad that controls speed and torque.
http://www.premiumfloors.com/html/su...4&pageNumber=1

Is it possible to run it at 92V/50Hz. on 240V/50HZ Transformer?
I can post a pic of the circuit board/speed control

This should be the breakout item no.12

http://spareparts.bona.com/default.a...=AMS0002582.01

Tim

[Al_The_Man]

I would suspect that the power is converted to DC then to AC, similar to a VFD, the power supply looks like it has a couple of large Capacitors for this purpose, so it most likely will not be affected by a difference in input frequency.
You could drop a line to their online support just to make sure.
Al.

[ozzytim]

I'll do that AL.I did ask them a question with the following reply:
"Hi Tim

It is right that the Advantedge is a 115V/60Hz machine, made only for the American market.

I don't think it will work. At least not very long... We have not tried it in our lab, but the frequency (Hz) is what normally controls the rpm's.

The Advantedge has a "brushless" motor, meaning there are no carbon brushes.
The speed and load is controlled by an electronic card.
My guess is that the card will go "bananas" when it don't recognize the proper power.

But, feel free to try. Just remember that any warranty is not valid, if you do.

Good luck.

Toni Müller
Leader Technical Support Sales Area Nordic "
Pretty bad customer service!

So does that mean the motor could be a dc motor?(Sorry i don't understand)
I'll take the card out and take a picture so as i can get YOUR opinion if you don't mind.It seems you have a greater knoledge than the supplier.
Thanks Ozzytim

[Al_The_Man]

The answer you got sounds more like from a salesman than anyone technically familier with their product.
He is most likely right that the frequency controls the motor but it would have to be produced artificially from DC so I cannot see the incoming frequency affecting the performance greatly.
The only down side to 50hz over 60hz may be the lower DC ripple frequency, which could result in slightly lower DC energy available and may lower the maximum power the unit has compared to one used on 60hz.
A brushless motor usually describes a motor that has a permanent magnet rotor and three star connected winding on the stator, the power to the three windings is commutated electronically.
Al.

[ozzytim]

Hi Al ,
can you give me any answers with these pic's??http://www.flickr.com/photos/32000889@N08/?saved=1

Thanks
Tim

[ozzytim]

Al I happend to see this .I think it this is the same unit ? http://www.hybridsys.com/index.htm
Under "downloads" Brushless type.

Does this mean i can just run it at 240/50 Hz?? and 110v 60 Hz.?

Thanks tim

[Al_The_Man]

The sensor on the motor is most likely for commutation, the unit in post #8 look the same, often when switching type power supplies are used, as this one appears to be, they are often designed to be used on a wide range of input voltages.
If you compare the one you have with the pictures you may be able to confirm it in more detail.
Al.

[ozzytim]

Al_The_Man ,
I spoke to the guy that supplied the controller and it turns out that the circuit board i have is for 110v something to do with the capacitors not being 400v.
He said,( as you did) that the Hz. is no problem and a stepdown transformer is o.k.Anyway he said he can supply me with a 240v unit.
I want to personally Thank You for Your Help.!!!
Regards tim