Induction motor?
Induction motor?
(OP)
Hi all,
I need a motor and vfd while I am building a machine. Peoblem is I do not know much about motors. I have an older Dayton 1.5hp and a 5 hp dayton. models 3n222 and 2N998D respectively.
230 AC 3phase. Do you have to connect an induction motor to a vfd or any AC motor will do. How do I know if these motors are induction motors.
I cannoit find any info on these motors at all.
Any help would be appreciate4d.
Thanks in advance,
Bob
I need a motor and vfd while I am building a machine. Peoblem is I do not know much about motors. I have an older Dayton 1.5hp and a 5 hp dayton. models 3n222 and 2N998D respectively.
230 AC 3phase. Do you have to connect an induction motor to a vfd or any AC motor will do. How do I know if these motors are induction motors.
I cannoit find any info on these motors at all.
Any help would be appreciate4d.
Thanks in advance,
Bob





RE: Induction motor?
When you get above hundreds of HP synchronous motors start showing up.
If the nameplate doesn't identify the motor as a stepper, a servo, or a special purpose motor it is likely an induction motor.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Induction motor?
I have another question. When I put the 1160RPM 230vac 3phase motor on a vfd, and use a 9" pully on the motor and a 3" pully on the shaft (lathe) I am turning, can I expect enough torque to at 3100 RPM?
Thanks,
Bob
RE: Induction motor?
Motor torque:
Tq (ft. lbs.) = 5252 x HP
_________
rpm
Then you have a speed increase ratio of 3:1 so you have torque REDUCTION of 1:3 at the final work shaft (less a small amount of mechanical transmission losses).
If your final work speed is 3100RPM, I would get a 2 pole (3600RPM) motor and use the VFD to lower the speed to other levels when necessary. No loss of torque in that process.
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
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RE: Induction motor?
Whether there is 'enough' torque really depends on your load, and we don't know anything about your load.
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If we learn from our mistakes I'm getting a great education!
RE: Induction motor?
It is going on a lathe for turning wood.
RE: Induction motor?
Generally, and especially on wood lathes, I recommend that you start with a motor close to the highest speed you want to work at and use a VFD to turn it down, unless you have a stepped pulley. In that case, strive to attain the best torque at lower speed ratios, that's where you need it, and use the pulleys to speed up for the finish work.
* Wifey made me give up the space for my hobbies when the kids were born. 26 years later they're still here...
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
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RE: Induction motor?
We are doing small pens and maybe some table legs.
This is the motor I have. I do have a 5hp motor that I may use instead then. It is 3500 RPM. Problem is the vfd is much more expensive for a 5hp motor.
Thanks,
RE: Induction motor?
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Induction motor?
can I reserve one more question for connections? I know how it should be done but, just want to make sure before I do the actual connection.
Thanks again,
Bob
RE: Induction motor?
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Induction motor?