3Phase AC Motor Controller Schematic Diagram

You will never build one for less than what you can buy a good new or used one for.

Could you give us any less information?

Could you be more specific?

"high wattage"

How much high?

from 2kilowatts up hoping for someone can help me..

really appreciated...

Friend, you will find it by following this link:

http://www.electrical-contractor.net/forums/ubbthreads.php/topics/189027/Basic_Start_Stop_AC_Motor_Cont.html

its like PWM (PULSE WIDTH MODULATOR) it can controll the 3phase ac motor its a varaiable controller..,,, anyone or anybody have an idea, knows a link or have a design for this?really appreciated,,,

Please throw all your cards on the table first, for all to see what exactly you want to know.

Most PWM controlling is done by a microcontroller today. The microcontroller then controls either an SCR or IGBT to actually steer the current to the motor. (I'll leave it to the student to identify the advantages and disadvantages of each of these component selections.) To copy somebodies hard work of a three phase motor controller design you will also need to have the source code of the microcontroller. This is typically written in C, C++ or assembly language.

I see a lot of homework in your future.

Yes, Guv. Anyone can do this when they have the details off the motor rating plate.

3 phase variable speed (or variable frequency) drives are common and very inexpensive for what they are, they are however ridiculously complex and expensive to build yourself, so just go and buy one.

You will NOT be able to build one cheaper than what you can buy one for, and it is not suitable or safe for a DIY project due to the complexity and amount of equipment required to build and program the microcontroller, switch mode power supply, DC energy storage systems, etc.

_{Jack - Actually services these things.}