Battery based DC motors
Robot Groups | Search
User Password
Register Now! Lost Password?

General Robotics Forum - All aspects of robots and their applications. 

Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
Battery based DC motors Donald 02-23-2006
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by Donald on February 23, 2006, 8:03 pm
I am looking into building a motor controlled lift.

I need it to be portable.

The motor I have in mind may draw 30 Amps under full load.

I have read that a voltage boost regulator is a good thing to have
between the battery and the motor.

So, my question is:

Where can I find a 12-14V in, 12V+ out at 30+ amps boost regulator??

Build or buy is fine.

donald

Posted by mlw on February 23, 2006, 8:49 pm
Donald wrote:

> I am looking into building a motor controlled lift.
>
> I need it to be portable.
>
> The motor I have in mind may draw 30 Amps under full load.

High current but not bad.
>
> I have read that a voltage boost regulator is a good thing to have
> between the battery and the motor.
>

I wouldn't say that is an absolute.

> So, my question is:
>
> Where can I find a 12-14V in, 12V+ out at 30+ amps boost regulator??
>
> Build or buy is fine.

If you need to regulate the speed then you may want to build a motor
amplifier, at that current, PWM. Otherwise, if you don't need to control
speed, just use a high current relay.

A "boost regulator" may be usefull if you want to make the motor go faster
than it would at 12V. Torque of a motor is based on current. The voltage
required to drive a motor at a specific speed must be higher than the back
EMF of the motor at the desired speed.


Posted by John Nagle on February 24, 2006, 11:44 pm
Donald wrote:
> I am looking into building a motor controlled lift.
>
> I need it to be portable.
>
> The motor I have in mind may draw 30 Amps under full load.
>
> I have read that a voltage boost regulator is a good thing to have
> between the battery and the motor.
>
> So, my question is:
>
> Where can I find a 12-14V in, 12V+ out at 30+ amps boost regulator??
>
> Build or buy is fine.

What are you expecting from a regulator? You're not going to
get out more power than you put in.

                John Nagle

Posted by Donald on February 25, 2006, 1:17 am
John Nagle wrote:
> Donald wrote:
>
>> I am looking into building a motor controlled lift.
>> I need it to be portable.
>> The motor I have in mind may draw 30 Amps under full load.
>> I have read that a voltage boost regulator is a good thing to have
>> between the battery and the motor.
>> So, my question is:
>> Where can I find a 12-14V in, 12V+ out at 30+ amps boost regulator??
>> Build or buy is fine.
>
>
> What are you expecting from a regulator? You're not going to
> get out more power than you put in.
>
> John Nagle

I would like to speed control the motor involved.

As the battery gets low, I can keep the speed constant.

Or am I totally off base !!

Donald

Posted by mlw on February 26, 2006, 8:39 am
John Nagle wrote:

> Donald wrote:
>> I am looking into building a motor controlled lift.
>>
>> I need it to be portable.
>>
>> The motor I have in mind may draw 30 Amps under full load.
>>
>> I have read that a voltage boost regulator is a good thing to have
>> between the battery and the motor.
>>
>> So, my question is:
>>
>> Where can I find a 12-14V in, 12V+ out at 30+ amps boost regulator??
>>
>> Build or buy is fine.
>
> What are you expecting from a regulator? You're not going to
> get out more power than you put in.
That is "true" in the purest sense, but a "boost regulator" can increase the
voltage, thus raising the point where you reach equilibrium with the back
EMF of the motor, allowing the motor to spin faster (assuming you have not
exceeded the capacity of the power supply). Obviously, the boost regulator
will use more power than a batter connection because a boot regulator is
not 100% efficient and the motor will be spinning faster than it would
under direct power.



Related Posts
  • Subject
  • Posted In
  • Date
Latest Posts
  • Subject
  • Forum
  • RSS

The site map in XML format XML site map
 other useful resources:
Official Robosapien Website
Lego Mindstorms Website

Contact Us | Privacy Policy