dc motor

 

I have been hard at work creating some new CAD models to share with the LMR team. 

This is the Solarbotics GM2 (or GM8 depending on the gear ratio) DC Gearmotor.  It is modeled in SolidWorks 2008 as a single part file, not an assembly, to reduce the file size.

i am using this 4 dc motor(100rpm) and 2 l293d motor drivers..if i want to run it for 15 minute.what is the best option for me?i dont want the robot to get too much heavy....

Hi everyone,

I need two motors for my new robot and I used two online calculators to make the motor selection:

• Society of Robots
• RobotShop.com

but I've got different results.

My input data:

• mass 7Kg
• 2 drive motors
• wheel radius 0.037 m
• velocity 0.38 m/s
• acceleration 0.2 m/s^2
• efficiency 65%
• maximum incline angle 20 degree

Results:

Hi guys!

anyone knows what the third wire in a dc motor is for? I have two dc motors with 3 wires (blue, yellow and black), the first two are the common ones but don't know why there is a third one. I have unscrewed the cap of the motor and this wire is connected to the shield / armour of the motor.

Perhaps I should connect this wire to ground to minimize EMI... Any ideas? Thanks

So I've decided to build my first robot which not the LMR "start here" one (that one is going to be my second one) and im using this circuit- http://costaricabeam.solarbotics.net/Circuits/Vores/555%20Photovore.png . I've tried about 10 different designs for the body but its just not working. When i cover the left photocell with my hand and the other one is exposed to light the speed of the motors is the same and same with the right photocell. has anyone tried the circuit? did it work?

hi guys I have bought an Arduino and the Arduino Motor Shield from adafruit. The tutorial on Ladyada says that I can power a motor which has a capacity up to 36V. So i programmed my arduino to run a motor on M2 and then when I check the voltage supply over there its just 3.17 V. So how do I power a 5V motor. Also the amperage on the pin is only 0.49A whereas Ladyada says that I can power a motor upto 0.6A and 1.2A peak.Is everything correct with my shield. I have also read that I can power it from an external supply-How do I do that? How will it help me?

Thanks in advance.

I just found this two rc cars, and I want to give them a new life. The small one seems to be working ok, but the motor of the biggest one doesn't want to work.



I removed the dc motor and noticed one thing I never saw, there are the two wires that connect to the motor pins, and there was a third wire but got loose. I think it was soldered to the motor body, and I wonder where must it be connected.. ground? I try to ground it but the motor still doens't work.

I was walking through Lowes the other day, and found this great trash can that looked like a robot to me. I was able to pick it up for super cheap!! What I want to do is add two DC motors to the bottom and a caster wheel. I want to make this robot carry my books around school for me. I am lugging more text book weight than I ever did in the Army with my ruck sac. My physics book alone is killer.

Hey folks.

 Becausse the PICAXE kit already ships with all the components (er, most of it) glued, I wanted something more challenging. So, I am trying to build my robotic brains from scratch. 

Whilst I have come across quite a few (video) tutorials with circuit diagrams using PIC microcontrollers, I am not able to use a motor controller. One such is here: http://www.seattlerobotics.org/encoder/200001/simplemotor.htm. 

In this thread, under Chris' noise question, Cliff suggested that motors sometimes are optimized to run in one direction. To the detriment of the motor's performance when running in the opposite direction. Ken observed the same thing in car-window-wiper-motors. Now I want to know more about this.

Have a look at the motor I use for my Theo Jansen Leg experiments.

I found on ebay these nice looking dc motors, lots of torque and very cheap. But are they really that good?