motors: how much power

Started by Michael Krause September 21, 2006
Hi,

I'm trying to control a motor with the BX-24, but I'm not sure which
motor to chose. The weight the motor needs to lift is about 500 g, and
it doesn't need to be lifted too fast.

I thought of a servo motor, but I'm not not sure what specs.

Can anybody help, or chip in some ideas?

THanks,
-Michael
For servo specs: http://www.gsal.org/articles/Servos/servo.html
Just go on a click on the brand you like.
Everything is put in inch / ounce. That means that from the center of the
fulcrum out one inch it can hold that many ounces of force.
500 grams = 17.7 ounces

You can use a standard Futaba 3001 servo with a 2in lever could lift your 500 gram apx 2 inchs.

Are you picking it up a little with a lever or pulling a rope on a spool?

Depending on the motor current your could use a geared motor with tip 120 transistors. Use 2 outputs and 1 PWM as a speed contron and 1 direction with relay. Also use 2 other inputs as limit switches for top and bottom limits.

TO help you out more I have some questions?
How are you planing to lift it? rope and pullys, levers
How far do you need to lift it?
Will you be holding that weight for a long time??

Hope this helps
Mech

Michael Krause wrote:
Hi,

I'm trying to control a motor with the BX-24, but I'm not sure which
motor to chose. The weight the motor needs to lift is about 500 g, and
it doesn't need to be lifted too fast.

I thought of a servo motor, but I'm not not sure what specs.

Can anybody help, or chip in some ideas?

THanks,
-Michael




---------------------------------
Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2/min or less.





Hi Mech,

Thanks for your comments. I want to operate a small door with the
servos, controlled by a BX-24. I'm planning on using a swing
mechnism to open and close door, rather than a lift-mechanism.

So, nothing should be lifted, but the context is similar. Most
important is that the servo can open and close the door. The door
has dimensions of 15x25", and is made out of wood (1/2" thick), which
may make it 300-500 g in weight.

I already ordered a servo to try it out (Hitec HS-815). That servo
has a lot of torque, and hopefully does the trick.

WHat is a "geared motor"? Is that a DC motor, able to do full
rotations?

-Michael

--- In b..., Mechatronics At Camden CC
wrote:
>
> For servo specs: http://www.gsal.org/articles/Servos/servo.html
> Just go on a click on the brand you like.
> Everything is put in inch / ounce. That means that from the
center of the
> fulcrum out one inch it can hold that many ounces of force.
> 500 grams = 17.7 ounces
>
> You can use a standard Futaba 3001 servo with a 2in lever could
lift your 500 gram apx 2 inchs.
>
> Are you picking it up a little with a lever or pulling a rope on
a spool?
>
> Depending on the motor current your could use a geared motor with
tip 120 transistors. Use 2 outputs and 1 PWM as a speed contron and
1 direction with relay. Also use 2 other inputs as limit switches
for top and bottom limits.
>
> TO help you out more I have some questions?
> How are you planing to lift it? rope and pullys, levers
> How far do you need to lift it?
> Will you be holding that weight for a long time??
>
> Hope this helps
> Mech
>
> Michael Krause wrote:
> Hi,
>
> I'm trying to control a motor with the BX-24, but I'm not sure
which
> motor to chose. The weight the motor needs to lift is about 500 g,
and
> it doesn't need to be lifted too fast.
>
> I thought of a servo motor, but I'm not not sure what specs.
>
> Can anybody help, or chip in some ideas?
>
> THanks,
> -Michael
>
>
>
>
>
>
> ---------------------------------
> Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and
30+ countries) for 2/min or less.
>
>
>



WHat is a "geared motor"? Is that a DC motor, able to do full
rotations?

Yes,
and Servos are geared motors with a stop and feedback.
I use hacked servos on my small moble robots for the drive motors.
The site below will show you.
http://www.seattlerobotics.org/guide/servohack.html
Servos are great geared motors for slow and light weight robots.
And the speed controner is build in.
Not a good idea for heaver robots.

The door the way you have it should not need much force to open and close it
if there is no other resistence.
What is the door being used for????


Michael Krause wrote:
Hi Mech,

Thanks for your comments. I want to operate a small door with the
servos, controlled by a BX-24. I'm planning on using a swing
mechnism to open and close door, rather than a lift-mechanism.

So, nothing should be lifted, but the context is similar. Most
important is that the servo can open and close the door. The door
has dimensions of 15x25", and is made out of wood (1/2" thick), which
may make it 300-500 g in weight.

I already ordered a servo to try it out (Hitec HS-815). That servo
has a lot of torque, and hopefully does the trick.

WHat is a "geared motor"? Is that a DC motor, able to do full
rotations?

-Michael

--- In b..., Mechatronics At Camden CC
wrote:
>
> For servo specs: http://www.gsal.org/articles/Servos/servo.html
> Just go on a click on the brand you like.
> Everything is put in inch / ounce. That means that from the
center of the
> fulcrum out one inch it can hold that many ounces of force.
> 500 grams = 17.7 ounces
>
> You can use a standard Futaba 3001 servo with a 2in lever could
lift your 500 gram apx 2 inchs.
>
> Are you picking it up a little with a lever or pulling a rope on
a spool?
>
> Depending on the motor current your could use a geared motor with
tip 120 transistors. Use 2 outputs and 1 PWM as a speed contron and
1 direction with relay. Also use 2 other inputs as limit switches
for top and bottom limits.
>
> TO help you out more I have some questions?
> How are you planing to lift it? rope and pullys, levers
> How far do you need to lift it?
> Will you be holding that weight for a long time??
>
> Hope this helps
> Mech
>
> Michael Krause wrote:
> Hi,
>
> I'm trying to control a motor with the BX-24, but I'm not sure
which
> motor to chose. The weight the motor needs to lift is about 500 g,
and
> it doesn't need to be lifted too fast.
>
> I thought of a servo motor, but I'm not not sure what specs.
>
> Can anybody help, or chip in some ideas?
>
> THanks,
> -Michael
>
>
>
>
>
>
> ---------------------------------
> Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and
30+ countries) for 2/min or less.
>
>
>




---------------------------------
Stay in the know. Pulse on the new Yahoo.com. Check it out.





Hi Mech,

Thanks for your help. The Hitec HS815BB is a great servo, and it can
easily do the task.

-Michael

--- In b..., Mechatronics At Camden CC
wrote:
>
> WHat is a "geared motor"? Is that a DC motor, able to do full
> rotations?
>
> Yes,
> and Servos are geared motors with a stop and feedback.
> I use hacked servos on my small moble robots for the drive
motors.
> The site below will show you.
> http://www.seattlerobotics.org/guide/servohack.html
> Servos are great geared motors for slow and light weight robots.
> And the speed controner is build in.
> Not a good idea for heaver robots.
>
> The door the way you have it should not need much force to open
and close it
> if there is no other resistence.
> What is the door being used for????
>
>
> Michael Krause wrote:
> Hi Mech,
>
> Thanks for your comments. I want to operate a small door with the
> servos, controlled by a BX-24. I'm planning on using a swing
> mechnism to open and close door, rather than a lift-mechanism.
>
> So, nothing should be lifted, but the context is similar. Most
> important is that the servo can open and close the door. The door
> has dimensions of 15x25", and is made out of wood (1/2" thick),
which
> may make it 300-500 g in weight.
>
> I already ordered a servo to try it out (Hitec HS-815). That servo
> has a lot of torque, and hopefully does the trick.
>
> WHat is a "geared motor"? Is that a DC motor, able to do full
> rotations?
>
> -Michael
>
> --- In b..., Mechatronics At Camden CC
> wrote:
> >
> > For servo specs: http://www.gsal.org/articles/Servos/servo.html
> > Just go on a click on the brand you like.
> > Everything is put in inch / ounce. That means that from the
> center of the
> > fulcrum out one inch it can hold that many ounces of force.
> > 500 grams = 17.7 ounces
> >
> > You can use a standard Futaba 3001 servo with a 2in lever could
> lift your 500 gram apx 2 inchs.
> >
> > Are you picking it up a little with a lever or pulling a rope on
> a spool?
> >
> > Depending on the motor current your could use a geared motor with
> tip 120 transistors. Use 2 outputs and 1 PWM as a speed contron and
> 1 direction with relay. Also use 2 other inputs as limit switches
> for top and bottom limits.
> >
> > TO help you out more I have some questions?
> > How are you planing to lift it? rope and pullys, levers
> > How far do you need to lift it?
> > Will you be holding that weight for a long time??
> >
> > Hope this helps
> > Mech
> >
> > Michael Krause wrote:
> > Hi,
> >
> > I'm trying to control a motor with the BX-24, but I'm not sure
> which
> > motor to chose. The weight the motor needs to lift is about 500
g,
> and
> > it doesn't need to be lifted too fast.
> >
> > I thought of a servo motor, but I'm not not sure what specs.
> >
> > Can anybody help, or chip in some ideas?
> >
> > THanks,
> > -Michael
> >
> >
> >
> >
> >
> >
> > ---------------------------------
> > Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US
(and
> 30+ countries) for 2/min or less.
> >
> >
> >
>
>
>
>
>
>
> ---------------------------------
> Stay in the know. Pulse on the new Yahoo.com. Check it out.
>
>
>