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VFD's and 3phase motors

What would be the advantage (if any) in using AC motors?

That would minimizing overall power consumption and maximizing the device output power speed/torque so coefficient is near 1:0.9.

DC is the basic form of "Electricity" since it was discovered and the raw material generated into any generator windings now ... ( Escaping some details here to keep it simple ) it is converted instantly to AC ...
which we use daily/safely in all home appliances.

Safety is very important for both DC/AC techniques as they both can cause fire and many other hazardous dangers ... And when some one clearly "Newbie" asks what should I use for motor ? ... the expected answer will take in consideration your DIY ability and the simplest choices of all related next motion control boards and their prices and how many members can provide you with a wide variety of good support on the mechanical and electrical side of the equation ...

That what makes DC is preferred to be used for Newbies and any low budget simple typical project.

We all used DC "Me :) too" to make things simple in our first step simulators "Ground floor" ... but if you want to go really wild ... Take the Elevator with AC motors "Pure heave force" to go on top of the www.xsimulator.net building.

Credit @speedy: http://www.xsimulator.net/community/threads/newbie-advice.6738/page-2#post-75562

PWM to Analog signal to drive VFD

Many VFD require Analog signal for speed control.

Our interface (Arduino for example) produces PWM signal.
It requires an external circuit to convert the signal to 0-10V analog signal.

DIY circuits
Here a circuit from @yobuddy

Here a circuit from @speedy
Speedy AC coupler.jpg


An updated PCI Opto-Coupler Shield that can be used for the
SMC3 Arduino 3DOF Motor Driver and Windows Utilities
can be found here ...​
Opto-Coupler + Arduino UNO.JPG 20170126_020732.jpg

20170127_021007.jpg Opto-Coupler wireing connections.jpg

On the shell
PWM 0-10V Digital to Analog Signal Tranformer Converter Module MACH3 PLC New
on eBay @ 6€
  • PWM digital signals into analog signals from 0 to 10V.
  • Convert PWM digital signal into 0 to 10 v analog signals.
  • Power Input Range: 12V-30V (Power requirements: more than 100MA)
  • Signal interface switch can be used for PLC or other industrial control board.
  • PWM Reception frequency range: 1 KHZ - 3 KHZ.
  • Current output capacity: 10MA.
  • Resolution: 0.1V.
  • Usage: by adjusting the potentiometer board, can match the calibration of PWM signals of different frequency pulse
by RacingMat