Popular Question

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Which type of motor is used in a drone?

For drones and other battery operated toy aircraft, power/weight ratio is critical. Special motors were developed for this purpose:

· For toy grade small drones: Coreless DC motors. (Electric motor)

They're as easy to control as any DC permanent magnet motor. Good power/weight ratio, but limited (and short) lifespan due to commutator wear. They have extremely high RPM but low torque, a reduction gear is needed.

· For hobby grade and professional ones: Brushless DC . (Brushless DC electric motor)

For aircraft, outrunner types are preferred because of the higher torque and better cooling. They can directly drive the propeller. For cars/ships the traditional inrunner is more popular, and some gear is needed.
All BLDC motors require a special, complicated electronic drive circuit, known as ESC. BLDC motors have been known for a long time, in fans, floppy and hard disk drives etc., but the parts used in drones employ extremely strong rare earth magnets and have the best power density across all electrical motors.

Which motor is used in toys?

Permanent magnet DC motor, like mini drive motor from jifei holding limited.

How much of torque can a toy motor produce?

For high speed micro DC motor it is around 80~150NM.

What type of motors can be used for robots?

That would depend a lot on the robot you are making. But if you are looking for a basic round up on different motors, there it goes :

1. Permanent magnet DC motor : Most basic of the motors. Gives good speed and torque. Available in different speed rates, generally RPM. Used for basic locomotion and movement of parts. Easy to use, but mostly for generic purposes.

2. Brushless DC motor : Very high speeds, 1000s of RPM. Used in drones, hovercrafts. Very fragile, easy to blow them up. Need good motor drivers to control. They are fun to work with. I like the noise they make.

3. Servo motor : A servomotor provides a precise control of angular position, velocity and acceleration. It used for controlled motion, like turning  a robots arm or legs to a certain degree, holding a position. Easy to use, needs a motor driver in most cases, unless you are using an utterly small one. They don't have a lot of torque so, not much useful if you are planning for some heavy lifting.

4. Stepper motor : They are similar to servos, in some ways but are a lot different they mechanism. They move in some fixed angular steps, 0.9 degrees, 1.8 degrees etc. They can be used with simple motor driver at their standard step angles but also can be made to rotate in smaller fractional step sizes using special drivers. They have plenty of torques, as compared to servos. Also they can rotate in complete circles unlike servos. Servos can rotate in maximum of 180 or something  as per their specifications but never a full circle.
5.Induction motors : These are heavy duty AC industrial motors, not much used in robotics. Though you may find some small induction motors here and there. They are very rugged, have high torque. Need starters and speed controllers.

What are the different types of motors used in laptops?

Such motors run on DC . Primarily 5-12V. They are small but high torque brushless DC motors and don't have any phases. Because DC does not contain any phase , just direct straight line current.

What type of motors do quadcopters use?

Coreless DCMs (reduced rotor inertia, tradeoff between RPM and torque, good for indoor fliers and micro-UAVs):

What is the approximate speed of the vibration motors in mobile phones?

A normal vibration motor in a phone runs at 9000 – 12000 (+/- 2000) rpm, but both higher and lower rpm versions are available. There is no set standard and it varies with different phones.

This comes to ~ 150 to 200 (+/- 33) oscillations per second.

How do mobile phones vibrate?

Mobile phones are made to vibrate by a very small electric motor with an eccentrically mounted (off-centre) weight on the shaft . When the motor spins, this unbalanced weight makes the phone vibrate in exactly the same way that a solitary soggy duvet in a washing machine makes it shake, rattle and roll all over the kitchen.

The motors that are used in mobile phones really are very tiny: some of them aren't much bigger than 4 mm across and maybe 10 mm long, with a shaft well under 1 mm in diameter. It wasn't very long ago that these titchy motors were regarded as a mechanical marvel with a price tag to suit.

What makes a mobile phone or smart phone vibrate? What is the device use to vibrate the mobile phone?

It is caused by a tiny vibrating motor, with an offset weight attached to it. When your phone rings, the motor engages, spinning the weight and causing the vibration in the mobile phones.

Why does a mobile phone move when vibrating?

Vibration in the phone is created by a motor with purposely displaced center of mass of rotating part. It kicks phone in all directions … and it moves in direction of minimal resistance from surroundings.

How do I build a wearable device prototype?

Advise on hardware,  find a CAD engineer for 3D model development and manufacture it with 3D printing.

What are problems that wearable tech devices face?

1. Fails to make the wearable useful, usable and desirable to the user. Many wearables on the market don't even pass the test of 'is it wearable.

   
   

2.  Lacks accuracy. After a few days or weeks of wearing, users throw the wearable in the back of their close because they realize it lacks accuracy (go up 10 stairs, wearable says 2).

   
   

  3. Underestimates user's sense of style. Wearables should often be thought of like jewelry or fashion. Things people wear daily have a legacy of design, personal preference, variety of colors, variety of materials.

  4. Fancy pedometers. Many of the wearables on the market today include a few features or just one. They solely track your steps or they are only for swimmers. Single sport or simple features will lose their appeal to users as they get more savvy because let's face it – people do a variety of activities and often play multiple sports.

 5. Battery life. Batteries are getting better and innovators are exploring new ways to generate power for wearables (just saw a great presentation on energy harvesting from your body heat as an energy source). Also I've heard there is an optimal amount of time for a charge to last – about one week. Why? If you make the device not need to be recharged for several months, people will forget where they put the charging cable (funny, but true – learned this from the Meta Watch team).

 6. Waterproof. Just like the phone industry, many makers of wearable tech products are overlooking (intentionally or not) making their product waterproof. People take showers, go swimming, drop stuff in the toilet. The product should be able to sustain these activities, however of course that would result in lost revenue for greedy hardware companies for replacements devices or support.

7. Good software. Wearables aren't just a form factor, targeting or hardware challenge. They generate data, and for that data to be meaningful to people requires good software. The "product" in wearable tech is equal parts hardware and software, thus making it a double challenge to create a good product people want to buy and will continue using.

8. Price point. The components in wearables aren't very expensive. I recall seeing Google Glass' components came down to around $50 for a $1500 priced product. For wearables to take off on the consumer space will require lower price points or new pricing models. I would be very curious to see a new "Fitbit" give their wearables away for free, and make their money via monthly services or limited feature set with their software that you have to pay to socially connect or gain access to all your stats.

What are the most popular wearable devices (besides Google Glass and Pebble) that offer SDK/API so that developers can build apps for those devices?

There is nothing other than Blocks Modular Smartwatch as an open platform, BLOCKS allows any company or individual to develop  Modules. There can be Modules for gaming, sports, healthcare, the  workplace, or even experimental ones for academic research. All this  means even more choice for you.

They have already partnered with major technology companies to  develop Modules and have over 1,500 individual developers signed up  to work on our platform. The BLOCKS Software Development Kit (SDK) and  Module Development Kit (MDK) will be made available soon.

What sort of research are you doing? I believe the key to any longitudinal health study is 1) ownership of your own data, 2) full access to multiple sensors, and 3) the support of a technical team/developer community to help you on your journey.

Who can build devices like Fitbit (wearable tech) for research projects?

Angel Sensor built that very environment to give you the framework that you need to develop whatever research you have in mind, with help along the way. Where others create barriers, hoops, and long approval cycles, we've created a 100% open environment for makers, researchers, and tinkerers to play and build the projects of their dreams.