Stepper VS Servo

Started by new October 25, 2004
Hey everyone !

I was just wondering, I'm using two KP4M2-008 stepper motors for a small robot my son and I are building, I finally got everything to work, including the IRsensor, and put it on the ground. I don't seem to be getting the kind of power( torque) I was hoping for ( Not even close ). Should I be using Servo motors for more torque, or am I doing something wrong. Any advice would be appreciated.

I should also note that it's a 12V motor, but am using a 9.6 volt battery pack, I couldn't find a 12 volt battery and charger. I can't see that making that big a difference, Am I wrong ??

Thanks !!

Gerald




What does your stepper pattern look like? Are you overlapping the pulses as you switch from one coil to the next? (half-stepping). This makes a big difference in the torque you'll get, compared to pulsing one coil, waiting, then pulsing the next coil etc. >
> From: "new" <>
> Date: 2004/10/25 Mon PM 04:39:29 EDT
> To: <>
> Subject: [BasicX] Stepper VS Servo




Going to half steps helped, but not to the extent that I'd hoped for. I guess I'm either going to have to try 12 volts, or go to servo motors. I was hoping someone could tell me if I'd be better off one way or another. ( EG Stay with the steppers, or go to Modified Servos )

Thanks for the suggestion.

Gerald
----- Original Message -----
From:
To:
Sent: Monday, October 25, 2004 6:52 PM
Subject: Re: [BasicX] Stepper VS Servo What does your stepper pattern look like? Are you overlapping the pulses as you switch from one coil to the next? (half-stepping). This makes a big difference in the torque you'll get, compared to pulsing one coil, waiting, then pulsing the next coil etc. >
> From: "new" <>
> Date: 2004/10/25 Mon PM 04:39:29 EDT
> To: <>
> Subject: [BasicX] Stepper VS Servo


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a.. To


Hi
Steppers are notoriously short on power if you just go
off their mass compared to dc motors and running them
on reduced voltage just makes things a lot worse.
Running off 9v you will only be getting about half the
12v torque. Normally steppers are run off higher
voltages with dropper resistors or electronic current
management. Google for stepper info. Servos are by far
your best bet and much easier to drive. If they are
driving wheels make sure they can turn continously.
Google for Servo Hacks.

David

|Message: 4
| Date: Mon, 25 Oct 2004 16:39:29 -0400
| From: "new" <>
|Subject: Stepper VS Servo
|Hey everyone !
|
|I was just wondering, I'm using two KP4M2-008 stepper
|motors for a
|small robot my son and I are building, I finally got
|everything to work,
|including the IRsensor, and put it on the ground. I
|don't seem to be
|getting the kind of power( torque) I was hoping for (
|Not even close ).
|Should I be using Servo motors for more torque, or am
|I doing something
|wrong. Any advice would be appreciated.

I should also note that it's a 12V motor, but am using
a 9.6 volt
battery pack, I couldn't find a 12 volt battery and
charger. I can't see
that making that big a difference, Am I wrong ??

Thanks !!

Gerald
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