Need Help!- Trying to build a little project need servo drive with potentiometer type speed contr

[Harryp]

Building a little project for school but am having trouble finding a resolved based servo motor and drive which are cost effective (cheap). I guess the major issue is finding 2 that are compatible. I need a 1-2 hp resolved based motor and a 3 phase drive which would let me control the motors speed from a potentiometer type of device and a switch for direction control. Please advise while I actively search for my answers elsewhere. I'd really appreciate it.

[Al_The_Man]

A couple of questions need answers first, do you really need resolver feedback just for speed control? why not simple tach?
How precise do you need it? for 1-2hp you could even go with a VFD and induction motor?
There are many options, but it depends on what exactly you expect the end result to be in the way of precise control and/or position?
Al.

[Harryp]

Originally Posted by Al_The_Man A couple of questions need answers first, do you really need resolver feedback just for speed control? why not simple tach? How precise do you need it? for 1-2hp you could even go with a VFD and induction motor? There are many options, but it depends on what exactly you expect the end result to be in the way of precise control and/or position? Al.

I don't need precision but do want it to stop quickly and not spin forever once the speed it turned to zero. The drive is always going to be on (7-8 hours continuously) however the motor is only going to be need to run now and then I'd need it so it works once the speed control is turned.

edit: This just came to my mind, I also don't want the drive to continuously set the motor to "zero" position setting and then run. I need it to be able to just go when the speed controller is turned and the switch directions when the direction switch is flipped.
To explain better I am going to put a pulley on the drive motor and then spin another motor off it which will be "dead".

[Al_The_Man]

You could use a DC motor with a Tach for a bit more precise control, and if you do not mind switching between fwd and reverse with a switch, then one of the KB or Baldor simple 120/240ac mains fed controllers would suffice.
These accept tach input as well as non-feedback.
There are usually quite a few DC ex servo motors on ebay that should do the trick, also the DC controllers can be had also.
It sounds like you just want to back feed another motor.
Al.

[Harryp]

Originally Posted by Al_The_Man You could use a DC motor with a Tach for a bit more precise control, and if you do not mind switching between fwd and reverse with a switch, then one of the KB or Baldor simple 120/240ac mains fed controllers would suffice. These accept tach input as well as non-feedback. There are usually quite a few DC ex servo motors on ebay that should do the trick, also the DC controllers can be had also. It sounds like you just want to back feed another motor. Al.

I want to stay away from dc motors but if thats the only thing fitting the budget then id have to go with that, you are exactly right its to back run another motor which wont be powered. It's a presentation to show how a motor is also a generator for a simple project. Could you point out some drives and motor combos? I've been browsing baldors website but all their drives listed there cost a ton on ebay.

[Al_The_Man]

Here is a couple of ebay items 150485406510 - 140444921377.
The second does not have a reversing switch but it can be added after market, brand new $35.00!.
If you were not thinking DC, then what?
Also, do you need 1 -2 hp?
Al.