hi all
it is me again with may be wrong quistions
but that is me , so what shall i do , i need to learn
i am facing a new situation with my application  and here itis
i need to connect a dc motor to my machine and control its speed with pwm - that what a engineer friend advised me-  how to do this if write and do i need a special hardware
can any one please explain or refer thanks for all
 

What are you wanting to do with the motor?
Hood

And what type of dc motor are you intending to use ?

Tweakie.

the dc motor will drive a pump but I'm not sure of the proper speed for the pump
and i think if it's possible it will be cheaper than ac motor+inverter (vfd)
and what kind i choose i hope you lead me