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Forum Index : Electronics : bench drill motor speed controll
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| irishron40 Senior Member  Joined: 22/09/2014 Location: IrelandPosts: 251 |
hello. I have a 220 Vac 500 watt single fase bench drill motor. I am looking for a diagram to make speed control. I wanna use this motor as a winch. I like it speed control and also forward and reverse direction. Any help and advise much appreciated. Also will I keep the torque at very very low speed. Thank you. ron |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Not going to be easy. I suspect you have a induction motor, and they need a specialised controller called a VFD ( Variable Frequency Drive ) if you want to control the speed. Reversing the motor is another issue, some induction motors can be reversed, some cant. Its would be easier and cheaper to buy a cheap 12v winch. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
Actually it is worse than Gizmo indicates. VFD can only really work usefully on a three phase motor, so a single phase induction motor would be a handful to start slow if cap start...cap reactance will be rubbish, and split phase... no torque... and thats if you have a VFD single phase ( could use the inverter we are playing with actually, they do variable freq and fixed freq) you could get some control by varying the freq.... not a lot, and not much torque low down, as saturation will be the problem with trying to inject sufficient voltage to get a decent result near the lower end This is exactly what you don't want in a winch. You could have lots of windings like some old washing machine motors, and then you can change speeds and directions, but only 2840, 1420 950,710 etc depending on ( slip and)how many poles you have available, 8 is close to the practical limit... as the wire becomes a big problem thereafter.. too much of it... more like a 4 speed gearbox. Forward reverse is much easier, and all induction motors of the normal variety ( not shaded pole) can be reversed very easily, but it would require 1 x dpdt relay or 2 dpst relays to do it, as you must reverse the run or start field ( relative to each other)... not both, and your start direction will change. On a multi pole switched motor this could become complex too, as they may use some poles as start winding to get going, then switch them between pole numbers thereafter. In short.... no... not even a little bit suitable. ...........oztules Village idiot...or... just another hack out of his depth |
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| irishron40 Senior Member Joined: 22/09/2014 Location: IrelandPosts: 251 |
that explanes that . lol ok thank you both. ron (-; |
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