Electrical Rotating Machines (Motors)

Thanks for responding,

The Machine is operated at a speed of 375rpm = 10Pole the motor does not have a VSD, but is of boring mill application.

Regards...

Hi Amalec - Is this for SA use at 50 cycles?

Also raining in JHB?

Morning Hendrik

yes its at 50 cycles.

Ja its raining cats and dogs this site

Hello,

I can you rise clearly your requirement for this application such as engineering the start up system?

rgds

dbt

Are u sure it is 10 Pole .Synchronous rpm 10 ploe is 600 and 375 is 16P on 50 HZ.Refer to toshiba .Incidently 120*Freq/syn rpm =poles

Hi there,

If not available from any of the mining coporations, it will be best to go to http://www.tic.toshiba.com.au/low_speed_synchronous_motors/

Lots of luck.

Cecil Vaughan

Total "outsider" type question here, as I am not familiar with the mining industry:

Is the original equipment manufacturer of the equipment that the motor is used in not able to supply some information? Such as minimum spec for an equivalent/replacement motor...? This might widen your options, allowing you to use other motors than the specific Toshiba motor you are trying to source.

Something is off in your expression of the mains frequency, number of poles, and RPM.

Go to this website to confirm my information;

http://www.vfddistributing.com/vfd-blog/2008/10/calculating-rpm-for-three-phase-induction-motors-with-vfds/

Find out what the customer really needs, and give them two options, the low cost higher expense of a squirel cage motor like they probably have or the high performance of a wound rotor motor. Calculate the life time cost of ownership of the better motor and sell that to them. For the application they will eventually appreciate the higher quality solution.

Directly contact Toshiba giving the machine no and they will respond immediately.Does he want one to one with same make or other makes are acceptable so long as mounting and shaft dimensions are maintained.

Hi

The customer specifically wants Toshiba

Hello again, amalec

Have you contacted Toshiba yet, quoting the original motor number?

If the customer wants an identical motor made only by Toshiba, you would need to talk with Toshiba only.

I do not know of a motor of that Make, Size, Speed etc just "a'sitting on a distributor floor somewhere", waiting to be purchased.

A motor of that size is normally made to order, thus the sooner the order is actually placed, the faster it will arrive.

Normally the Maker will require a Bank Draft, or irrevocable letter of Credit, payable once the crated unit is placed on board ship, so you would need to think about that part of the operation, and ensure that you receive the credit, or your Client pays direct to Toshiba, at the time of placing the order.

Do not forget Shipping + Insurance + Customs + Duty + Craneage + Installation + Labour and other miscellaneous charges and allow for a reasonable profit for yourself as well.

So...talk to your local Toshiba in ZuidAfrika, (Contact details given in my earlier Post above) and if they are not entirely helpful, try Toshiba USA or Toshiba Australia, per the earlier Posts here.

Kind Regards....