Questions tagged [motor]

Without qualification 'motor' is usually taken to mean a rotary electromechanical motor, typically either a brushed or brushless design.

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4answers
460 views

Passing power through a motor

How would one go about passing power through a motor? Let's say we have some basic robot which has a motor that slowly spins a limb, on each end of that limb, there is a motor which again spins a ...
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2answers
455 views

Which encoder should I use with a 24V Dc motor and 6mm shaft?

I would like to control the position and velocity of a DC motor like this one (ZY MY 1016 - 24V - 10A - 200W). The motor comes with a 13 TOOTH SPROCKET and the diameter of the shaft is 6mm. It's not ...
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3answers
181 views

Questions on gears for a robot actuator [closed]

I have some questions regarding building a gearbox for a motor to create a robot actuator. Given my desired motor and loads, I've determined that a gear ratio in the 400-700 range is adequate for my ...
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3answers
2k views

How to program parallel PID control loops? So I can give my robot multiple set points to follow

So I'm in the process of building my robot and it has encoders on every wheel measuring speed and position and a compass sensor measuring heading. I have 3 seperate PID loops at the moment, I can ...
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1answer
302 views

How to attach a motor to a blade?

The hole is a slightly too big for the motor's shaft. I thought about hot gluing them together. Link to picture here
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2answers
430 views

Nano sized electric motors

What is a good website for buying 1.5V continuous motors? I'm looking to build a clockwork robot but I cannot find a motor small enough to fit inside my power box and I don't want to mount it outside ...
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3answers
2k views

How high of a gear ratio can a motor have?

I want to make a robot arm where a joint is powerful enough to lift 8 kg up at a distance of 1 meter. This requires torque $tau = r*F = r*m*g$ = about 80 nm. So now I am trying to find the ...
3
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1answer
3k views

How can I power a wheel but let it spin freely when not under power?

How can I power a wheel but let it spin freely when not under power? I saw the question How can I modify a low cost hobby servo to run 'freely'? but I'm more interested in knowing if there is ...
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2answers
5k views

I want to control a sewing machine motor; need help with choices

I've got an industrial sewing machine (think "can sew with thread that looks like string, and has no trouble pounding through 20 layers of Sunbrella fabric"); it's got a 1 HP motor to power it. (I've ...
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3answers
658 views

Sun tracking with +/- 0.1degree accuracy?

For a school project I am looking to track the sun with +/- 0.1 degree accuracy for use with a parabolic dish reflector. Say we need a final output torque of about 20Nm, what kind of gearing/motors ...
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2answers
122 views

What motors should I use that do not require gearboxes? This is a car like robot [closed]

I am new to robotics, and ime looking for a <12v motor that can be used to power a car-like robot.I will have two of these, so I can turn on-spot. Furthermore I want them not to require a gearbox, ...
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1answer
43 views

Seamless motor movement

With the lego NXT Mindstorm kit I would like to have a rotating carousel that has "perfect" movement. This carousel has baskets and therefore it has quite a bit of inertia. I would like to find a ...
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3answers
664 views

Keeping two wheeled wall following robot straight

I have a two-wheeled (two DC motors) robot that needs to follow the wall beside the robot. The issue is that the DC motors spin at different rates (because they are not identical, of course), so the ...
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1answer
88 views

How to use gear motor 9 with Arduino

I am new to robotics. I want to make a robot using Arduino Uno R3. I need to use Gear Motor 9 for that here is the link. The problem is that motor needs 50mA current. But arduino only outputs only ...
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1answer
136 views

Comparison of the efficiency of DC motor current limiting / control methods?

I am using the wheels and motors of an RC toy car as a simple robotics platform. The car has 2 motors, one drives the back wheels, the other steers the front wheels. The steering motor is stalled by ...
4
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1answer
834 views

Submarine screw and the isolation from the water [duplicate]

How does the submarine prevent water flow through the screw mechanism? The mechanism rotates the screw so there should be a little gap, how come the water doesn't come through this gap in to the ...
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2answers
496 views

What servos does this robot use?

Well, I wanted to use some very small servos for a project and the smallest I could find there these: https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=33401 But Danny Choo (a ...
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1answer
3k views

LM2576 and LM2596 regulator make microcontroller hang

I am making a self balancing scooter which runs off 2 x 12V SLA batteries connected in series to make 24V. Everything works as expected except for the power supply which makes me pull most of the hair ...
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4answers
156 views

Continous rotation with cables

A motor needs to spin n*360 degrees. On top of the motor there are distance sensor which scan the room. I.e. lidar. What options do I have for implementing a continous rotation while having cables ...
1
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0answers
147 views

How does the “rated torque” for a gear relate to the maximum torque?

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
2
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2answers
377 views

Selecting a gear reduction: torque vs speed

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
3
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1answer
186 views

Stated power for a motor does not equal nominal voltage x current?

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
3
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2answers
13k views

Choosing DC motor: max needed torque vs nominal torque

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
2
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1answer
1k views

Is the nominal voltage of a motor the voltage to apply to the motor?

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
1
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1answer
171 views

NAO motor model identification

I am trying to create a model for the NAO [robot]'s motors. The figure below shows the step response for the knee motor. Afaik the NAO internally uses a pid controller to control the motor. I have no ...
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0answers
52 views

Choosing motor characteristics [duplicate]

I have just sized the DC motors I want to use (corresponding to my robot and its intended applications - my figures include a 50% uncertainty factor to account for friction in reducers and other ...
0
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2answers
90 views

Risk of overloading motor controller

I bought 2 brushed motor controllers from China for my hobby-weight battle robot (http://www.banggood.com/ESC-Brushed-Speed-Controller-For-RC-Car-Truck-Boat-320A-7_2V-16V-p-915276.html). These are ...
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2answers
1k views

Changing tank drive (differential) mode to single joystick drive mode

I bought 2 brushed motor controllers from China to use within my hobby-weight battle robot (http://www.banggood.com/ESC-Brushed-Speed-Controller-For-RC-Car-Truck-Boat-320A-7_2V-16V-p-915276.html). ...
0
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1answer
466 views

Motor controller calibration

I bought 2 brushed motor controllers from China to use with my hobby-weight battle robot (http://www.banggood.com/ESC-Brushed-Speed-Controller-For-RC-Car-Truck-Boat-320A-7_2V-16V-p-915276.html). ...
2
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0answers
630 views

PID Control Tuning [duplicate]

Im currently designing a robot for my undergraduate project. One of the task of this robot is to follow the wall. For the purpose I'm using a PID control system, where the reference is given from a ...
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1answer
1k views

Motor for weapon for Hobbyweight

I am currently building a hobby-weight (5.44kg) robot. The weapon will be a vertical spinning disk at the front. It will probably be a commercial one from the hardware store or I could maybe get one ...
3
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2answers
553 views

Rotate (and stop) a large disk in very tiny increments

In a lab build I'm doing, I'm stuck at this problem, so I am fishing for suggestions. I'm creating a turn-table type setup where I need to make readings (with a nanotube-tip probe I've already ...
1
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1answer
119 views

Spinning disk Weapon

I am building a Hobby-weight robot and my weapon of choice is a spinning disk at the front. As regards the disk I was thinking of buying commercial (grinder-type) disks and change type of disk ...
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1answer
1k views

Diode or capacitor across terminals of brushed motor

I am currently building a hobby-weight robot (5.44kg) and will be using 2 x 14.4v cordless drill brushed motors to drive my wheels. I have read somewhere that due to "induced currents" when I turn ...
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1answer
42 views

Amperage on brushed motors

I am currently building a hobby-weight (5.44kg) robot and will be using 2 x 14.4 cordless driller motors for my wheels. The thing is I keep reading about high amperages when working with r/c models ...
3
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1answer
103 views

What should I be looking for in a DC motor that will be used in a UROV thruster?

I know that some DC motors produce a lot of torque but only actually move at a very slow rate, while others do the exact opposite. I know that I need some sort of balance between torque and the RPM's ...
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2answers
2k views

Adding reverse function to a brushed motor electronic speed controller

This is for a Hobby-weight (5.44 Kg) battle robot. I bought two ESCs for my drive motors but the ESCs do not have a reverse function (or brake for that matter). Is there any simple way I can achieve ...
2
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1answer
371 views

Over-voltage on a brushed electronic speed controller

This is for a battle robot in the hobby-weight class (5.44 Kg max) I want to drive the robot using 2 cordless drill motors rated at 14.4 volts. I have 4S LIPOs which means I have 4 x 3.7 volts or 14....
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6answers
10k views

What mechanical parts can be attached to DYJ48 stepper motor?

Sorry I am asking a mechanical question here, but, after all, where else people have experience with using motors? If there is a better forum for this, please do guide me. Everywhere I've seen online,...
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2answers
3k views

For robot wheel control : Brushless DC motor or Servo Motor?

Simply, when to use brushless dc motor and when to use Servo Motor ? what are the differences , specially when adding an encoder to the dc motor you can have the position and it will be similar to ...
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2answers
1k views

12V Arduino Dual Bridge to supply at least 5A [closed]

I am looking for a 12V Dual Motor Controller that can supply at least 5A per channel for two 12V motors, and that can be used with an arduino. Do you know of any product with those specs? Thanks
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1answer
4k views

DC motor control - speed-torque curve

I am having some trouble understanding how to practically use the speed-torque curve of a DC motor. I understand that the gradient of the speed-torque curve is defined by the design of the motor, the ...
4
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1answer
4k views

Choosing motor for a tricopter

I'm a newbie in RC field..I am planning to construct my first Tricopter ever. Can anyone help me to find the power rating to select the motor for a tricopter? I am at the beginning stage of ...
3
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1answer
6k views

Single-shaft vs Double-shaft motors

I am trying to make a line follower robot and I need help regarding the type of dc motor to use. So we have a single shaft BO Motor and a double shaft BO Motor. Can anyone help me understand what is ...
0
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2answers
99 views

Device to roll a mat

I'm looking for some direction on how to create a device that does the following: Imagine you have a yoga mat, I want a device that can roll it up and unroll it without a human intervening in the ...
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1answer
544 views

Exoskeleton Drive System Help [closed]

I am currently working on an exoskeleton. The exoskeleton is going to help kids with cerebral palsy learn to walk 4 years sooner than traditional therapy. Currently we are using 2 Ame 226-3003 with ...
1
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2answers
624 views

Solenoid to launch a ping pong ball

I've been looking for ideas on how to launch a ping pong ball a small distance (< 1 metre) for a game. Solenoids look like they might be useful but I'm not 100% on what force/type I need. I can ...
1
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1answer
438 views

Designing compatible spur gears for a robot gearbox

I'm trying to increase the torque on the output shaft of my robot's gearbox. I have a motor with a pinion attached to it with 8 teeth. I want to create a gear with 33 teeth that will mesh with the ...
3
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2answers
1k views

Electronic Speed Control Concepts

I am a programmer who has never worked with electronics before. I am learning the concepts and hoping to build a quadcopter, with the control software entirely written by me. Motor control seems to be ...
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1answer
3k views

Adding external magnets to a DC motor

Is it possible to strengthen permanent magnet DC motors by simply attaching extra magnets on the outside of the motor casing - adding to the magnetic field? If this is not possible, the question ...

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