server question please help
i have a couple of servers like from a cd player and such will they work just the same as the continus motion servers from parallax
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wayne fox 3
windows and linux user
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wayne fox 3
windows and linux user
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Comments
I think you mean to say "servos" not servers. I doubt that you'll find any r/c servos inside a CD player. The r/c servo is the basis for the continuous motion motor that Parallax sells. The "r/c" refers to radio control, which is how r/c servos are usually used. When used in robotics for drive motors, they are controlled directly, however, not via radio control.
Indeed you my find various types of DC motors inside a CD player, but they don't operate in the same manner as an r/c servo. You may find permanent magnet (PM) DC brush motors, brushless DC motors, DC servo motors, or you may find stepper motors inside such devices. Any/all are controlled in a different manner than r/c servos.
Generally speaking small motors with only two leads are PM DC brush motors. Those with 4, 6, or 8 leads are generally stepper motors, and those with an odd number of leads may be DC brushless motors, or DC servo motors. It's best to find the nameplate, if one exists, and research the motor that way.
Regards,
Bruce Bates
What do you mean by brushless (sorry but for my bad english)
Provas
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Older PM DC motors and even many recent, inexpensive types have brushes which act as commutators, supplying power to each of the appropriate armature segments, in turn. as the armature rotates. There are some obvious downsides to such a set up, but one of those which may not be apparent is the inability to smoothly and precisely control the motor using a simple feedback mechanism which is internal or, integrated with, the motor.
In a brushless DC motor the "commutation" (albeit non-contact) is usually done using Hall effect sensors to detect magnets which are attached to the rotating armature. Power is thus applied to the appropriate external coils, governed by the Hall effect sensors, causing the armature to rotate. The brushless DC motor can almost be viewed as a DC brush motor constructed ... inside out!
Below are some links you may find helpful in further explaination. Here is a rather elementary web page with many good examples, illustrations, and discussions about the various types of DC motors, how they operate and what the advantages and disadvantages of each type are:
http://my.execpc.com/~rhoadley/magdcmot.htm
Here is a tutorial on just brushless DC motors (BLDC) which is short, but quit complete, even in its brevity:
http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=02nQXGrrlPY7r8hv0V
I hope that is helpful.
Regards,
Bruce Bates
http://www.freescale.com/files/microcontrollers/doc/app_note/AN1627.pdf
http://www.electricmotors.machinedesign.com/BDEList.aspx
Order in ease of use (from the perspective of a basic stamp)
1. Brushed DC motor
2. Servo
3. Stepper Motor
4. Brushless DC motor
A stepper is a special type of brushless.
A brushed motor has brushes which make contact with the commutator, energizing the windings in the rotor which causes a magnetic feild in the rotor·to interact with stationary permanent magnets in the stator, resulting in rotation. So in brushed motors the rotor's magnetic feild changes polarity and the stator's magnetic feild is constant.
A brushless motor reverses the two, the rotor has a permanent magnet(s), and the stator has windings whose magnetic feild is alternated to make the rotor spin.
The position of the rotor is inherently known in a brushed motor, therefore a simple DC current is all that is needed for the motor to run. The position of a rotor must be determined in a brushless motor in some manner in order to determine when the stator windings must be switched on or off, and therefore requires a special driver circuit in order to operate.
Motor Terms Glossary·
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Post Edited (Paul Baker) : 8/9/2005 2:49:15 PM GMT
(bad spelling was due to being up really late)
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3
could i use that and it not dammage the board or could i safely use that with it i should i say
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3
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Post Edited (Paul Baker) : 8/9/2005 8:39:23 PM GMT
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3
The r/c servos can obtain their power from a separate power supply sometime in the future, if you wish. Just remember to tie the ground from that r/c servo power supply back to the Stamp ground, so all the grounds are common.
Regards,
Bruce Bates
was that in regards to the servo question or the power adapter i found
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3
Either ot both. Any power supply, other than that which operates the Stamp, which supplies power to any peripheral devices will need to have its ground tied back to the Stamp ground. The isssue is not specific to r/c servos, it applies to any DC device which will be controlled by the Stamp via the I/O pin ports.
Regards,
Bruce Bates
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3
Various r/c servos will have certain idisyncracies, but generally speaking what you said is correct. Due to the nature of how they are controlled (a variable length pulse of current) all r/c servos should react basically the same way, so long as they are wired correctly. There are many examples of using r/c servos in the free documentation provided by Parallax on teir web site.
Regards,
Bruce Bates
It's much more likely to be a stepper motor of some kind, which are harder to interface.
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3
and a battery the fan is 12 v 0.11a
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3
P.S. Guys thank you for the above info given about brussless DC motors!!!
Regards,
Provas, Greece
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-Rule your Destiny-
--Be Good. Be Bad. Be Provas--
Post Edited (Provas) : 8/11/2005 3:54:26 PM GMT
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wayne fox 3
windows and linux user
computer and robotics hobbyist
all around nice guy
check me out here at myspace.com/waynefox3