Mechanics and Construction > Mechanics and Construction

pwm and servo motors

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joe61:
I would think the vendor could answer a question like that. You might try emailing them. I didn't see any specs on the web page.

Joe

jkerns:

--- Quote from: urshiva239 on March 12, 2012, 05:39:51 AM ---hmmm okay dude ..
but i was asking that do need any extra circuits for different types of motors?
I have a Double horse 9053 RC Helicopter ( http://www.hobby-estore.com/3-CH-Volitation-9053-Helicopter-Gyro-p/eh-dh9053.htm )
I am not able to understand which type of motors does it have.. Please help me out of this

--- End quote ---

A servo motor controls to a position. You send it a pulse and the internal feedback sets the output to a position that is proportional to the width of the pulse. The pulse is repeated at regular intervals - but what matters is the width of the individual pulse, not the percent of the time that it is on. Servos typically move 180 degrees (or 90 or 360).

DC motors can run continuously. The motor power will be correlated to the power sent to the motor - this can be controlled by pulse modulation - you turn Thorn the power on for 10% of the time and off for 90% and you get about 10% of the available power. 50%/50% gets you half, etc. The exact pulsewidth is not that important - what is important is teh percent of the time that it is on.

From the description, you have three motors - each turns a rotor. Likely they are all three DC motors that are controlled by pulse modulation.  In a RC car or RC fixed wing airplane typically servos are used to steer the front wheels or move control surfaces back and forth, and DC motors are used for the main propulsion.

newInRobotics:

--- Quote from: urshiva239 on March 12, 2012, 05:39:51 AM ---hmmm okay dude ..
but i was asking that do need any extra circuits for different types of motors?
--- End quote ---
No, dude, what You were asking was whether PWM works for DC motors as well as for servos. What You had in mind while asking your question is as different matter  :P

--- Quote from: urshiva239 on March 12, 2012, 05:39:51 AM ---I am not able to understand which type of motors does it have..
--- End quote ---
Not servos, that's for sure. Most likely brushless DC motors, although might be brushed ones as well.

urshiva239:
heheheheh  ;)  :D
whatever ... but is there any way to find which type of motors are that?
i even mailed to vendor but there is no reply from him...

newInRobotics:
You can take toy apart and have a look at the motor Yourself, if it has two terminals, then it is brushed motor, if it has more than two - it's brushless  :)