hello friends

I am design centrifuge machine .
so i need some help
my machine specification 4200 rpm
so which motor suitable for that and which drive we are used also how to feed back motor speed to vfd to control and accurate speed of motor
please help me for new development

 

Welcome.
6000 rpm use these ----> https://www.mscdirect.com/industrialtools/6000-rpm-wheel-grinder.html
----> https://www.volcanomotor.com/products/4200rpm_high_speed_brushless_dc_motor-en.html

Available at discarded equipment----> https://www.gumtree.com.au/s-ad/st-...5hp-4200-rpm-with-speed-controller/1158176601

AC ----> https://www.ebay.com/itm/3-4HP-4200...tchen-Waste-Disposal-/112484888328?rmvSB=true

DC ----> http://www.globalindustrial.com/p/motors/ac-motors-2-phase/dc-motors/motor-25-tenv-1750-4200rpm-536f

There is air driven too. Optical sensors can feedback a speed controller.

 

my machine specification 4200 rpm
so which motor suitable for that and which drive we are used also how to feed back motor speed to vfd to control and accurate speed of motor

The term VFD implies an AC motor, a 3ph induction motor with a VFD and either a flux vector or encoder feed back control version, depending on how precise the control needs to be.
Under around 5HP the VFD can be fed from 1ph AC supply.
The max rpm of a 2 pole motor would be around 4500rpm using a VFD.
Max.

 

hello friends

I am design centrifuge machine .
so i need some help
my machine specification 4200 rpm
so which motor suitable for that and which drive we are used also how to feed back motor speed to vfd to control and accurate speed of motor
please help me for new development

The centrifuges that I am familiar with use a DC brush type motor and a DC drive that supplies a variable voltage at several amps. But those units also have a 6 inch flat belt pulley on the motor and a 1 inch diameter pulley for the rotor, which gives a large speed increase.
For other variable speed applications, if you want a high quality package that will work as needed when you first switch it on, buy a BALDOR brand variable speed drive. The money saved by having it do what you need as soon as you enter in the command will easily save more than the cost of the VSD system. AND, if it needs to be serviced or replaced the company can sell another or reapir that one.

 

You haven't specified what load you wish to centrifuge. Is this for micro-samples or for tons at a time?

 

buy a BALDOR brand variable speed drive. .

BTW, most of the Baldor DC drives are actually made by KB and just re-branded and can either be SCR bridge type or the more expensive PWM.
Max.

 

You haven't specified what load you wish to centrifuge. Is this for micro-samples or for tons at a time?

Alec has made a very important point. The size of the load matters a lot, because in a centrifuge the torque is required mostly to overcome friction, and given the reality of bearings, the friction depends on the load. In addition there is the rate of acceleration, the quicker the load needs to speed up the more power required. So there are a lot of questions that must be answered before any respose means anything.