Motors

12 mm Gear Motors for Robotics and Mini Appliances

ANYO DC Micro Motor

Division introduces the 12GN Series, a new line of 12 mm geared DC micro motors. Ideal for robotics and compact applications, these high torque motors offer designers a space saving alternative to much larger brush motors. The 12GN motor measures only 12 x 10 x 29 mm from terminals to tip of shaft and weighs 8.7 gr. Starting torque is 300 mNm. Rated load is 20 mN.m.

Operation is quiet due to the close tolerance precision of the shaft rotation. In addition to robotics and mini appliances, other applications include power tools, locks, medical and dispensing equipment, and mini printers. Depending on model and features, the price of a 12GN

gear motor is less than $3.00 in volumes of 100K and above. SANYO also offers an extensive product range of vibrator, precious metal brush, brushless, and stepper micro motors in OEM quantities.

SANYO 12N gear motors are available with a choice of four gear ratios. Model NA1S has a gear ratio of 1/75.7, model NA2S is 1/134.5, model NA3S is 1/196.6, and model NA4S is 1/297. Motors with limiters are also available.

No-load speed ranges from 62 to 246 RPM, depending on model. No-load current is 120 mA. Endplay is 0.02 to 0.35 mm in the drive shaft. Lateral play is less than 0.04 mm at the tip of the drive shaft. Vibration is less than 40 m/s2. Noise is below 55 dB at 5.0 V. Operating temperature range is 0° C to +50° C, but there is reduced life expectancy in colder environments.

Gear motors as small as 8 and 10 mm are expected to be introduced in late 2004.

For further information, contact:

Sales and Supply ^ompa'ny

1062 Thorndale Ave. Bensenville, IL 60106

Tel: 630'694«8235 Fax: 630«595«7028 Email: [email protected]

Website:

www.sanyo.com/industrial/micro_motors

Circle #148 on the Reader Service Card.

point to a source of light or the sun. Once oriented so, the plant would open its leaves to fully expose solar panels to light. In its base, large capacitors would charge up and store voltage — its food. On its base, "scent" modules would attract herbivores to it for feeding.

Herbivores — being bigger and slower, as in nature — would allow for attack by the faster predators. However, this is where "herding" would come in. The predator may get the closest herbivore, but would be hard-pressed to get the three behind it. Could an herbivore also sense a predator and flee? Could a predator smell a BEAM bot it considers to be prey? This gets into a built-in instinct system more complex than basic BEAM walking instinct, but — if we applied other robotic concepts, such as subsumptive behavior — we could create instinct and still not have to use a microcontroller or processor.

The first precept of being a carnivore is eating other creatures. This implies having a mouth, which — on many BEAM bots — has been sorely missing. With jaws, a predator could effectively rip, tear, or crush its intended prey, not unlike a lion grabbing the throat of larger prey to bring it down. Now, the predator could search the disabled bot for food —

i.e., an energy source. Mandibles could directly attach to a creature's power source and suck it out with a sucker bite — like a mosquito or a spider.

The predator would, of course, be lighter and faster, but would have to feed quickly and often to prevent losing power. This would create a feeding instinct.

Predators would also have to scout out herbivore prey — which might have their own defenses. Ambush might be the tactic of the day, so predators and herbivores would both have individual scents. This way, predators would avoid each other or possibly engage in territorial disputes. This could be done with frequency bursts. Scents could be represented by different colored LEDs (Light Emitting Diodes). Herbivore bots could even engage in camouflage techniques, such as hiding behind a recharger plant to mask its LED scent from any would-be predators.

Finally, let's consider the ecosystem itself. What would be the life span? At some point, would you permanently turn off the light source and start over? How about daylight versus nighttime cycles? Would you have nocturnal bots and diurnal bots? How would they coexist?

You could add weather to the ecosystem — fans to provide wind or humidifiers to provide fog. You could have water obstacles with shallow points that must be crossed by land walkers. This brings to mind water creatures — a whole other breed of BEAM technology: BEAM fish, eels, and crocodiles. Then, of course, some unwary bots might drown. You could add complexity to the system's circle of life with some plants that yield more electricity then others — even poisonous plants. This would be true survival of the fittest.

There is already work being done on large BEAM zoos and displays, but there is room to kick it up a notch. The only limits are imagination, time, and money. Then again, aren't those the same demons that roboticists face on a regular basis? SV

Author Bio

Jason Travis is an active member of the Seattle Robotics Society. He works in Business Administration and is seeking a career change into electronic engineering. His hobbies include robotics, AI, A-Life, and playing jazz on the saxophone.

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