Can we reuse this material? I mentor a competitive high school robotics team, where we use several types of brushed dc motors. Would like to use this materail to teach them about brushed dc motors, motor selection, etc
Think of a motor as a gear. The farther the magnetic interface from the center of the shaft the more lever arm. So a "pancake" motor will have more power with the same energy than a small cyl. Theoretically... right.
@pauln The magnets are important. In one application the magnet was being slowly demagnetized because we were increasing the drive current too quickly while the motor was under load. It was a low cost motor.
@pauln, A majority of our applications use stepper motors because of the tight control. And in our particular applications we don't require a lot of torque, but do require a fair amount of speed. Can the same level of control be achieved with a brush DC motor and, if so, is there any particular advantage to going that route?
If you do not see the audio bar above, please refresh your browser. It may take a few tries. The audio bar should appear at the top of the page. Then, press the play button. Note however that some companies block live audio streams. If that's the case with yor company, the class will be archived immediately following the live show and no one seems to have a problem listening to it on demand.
That picture of the 'Paper-clip Brush DC Motor' (slide 6) looks very similar to one my son made from one of those electric experimenter kits (the picture doesn't show the permanent magnet). And it actually worked.
@johnwolf.lobo, I THINK that spiral cut spreads out the rotor poles for smoother motor rotation. If the poles were straight (lining up in parallel with the stator poles) then I think the motor tends to "cog" to those positions making for "jerky" rotation. (I am not a DC motor expert! It will be interesting to hear the experts' responses.)
-The streaming audio player will appear on this web page when the show starts at 2 PM Eastern time today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. If that doesn't work, the class will be archived immediately following our live taping.
I'm caring the market developing of brush DC motors, due to the brushless motors have more advantages and sharing more and more market, the brush motors were going down. Is that true? What's the better aspect of brush motors than brushless motors?
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.