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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545 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 ...
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2answers
628 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 ...
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1answer
447 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 ...
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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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2answers
128 views

How to brake a brushed dc motor, belt-driven linear actuator to within 0.5mm of an end stop

I will have a belt-driven linear actuator, consisting a gantry-plate riding on two rails. I'm thinking of using a brushed dc motor. The gantry will move from home position to the right (outbound) at ...
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1answer
294 views

PWM PID control for small 2 watts brushed DC motor

It is "good enough" for PID output directly controls, without further modelling, the PWM duty cycle? Logic behind the question is, In case of pure resistance heater, PWM duty cycle percentage ...
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1answer
306 views

Transfer function of DC motor being unstable due to a controller?

I am having a hard time grasping the concept of a DC motor with load being unstable, and stable due to a controller My confusions appears as I am trying to design a controller for one using Z-N ...
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2answers
109 views

How can I dynamically control the amount of torque necessary to rotate something for a test rig?

I'm looking to build a test rig for a robot that rotates a 1" diameter pipe 180º (roll not yaw or pitch). I am currently testing a motor's performance when subjected to various kinds of PWM (high duty ...
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0answers
37 views

Actuation of three reciprocating blades via conversion of rotary to linear

Sorry if this is out of robotics, but this seemed the closest. A motor has to be used to rotate three cranks. They are in the same plane, but each should not run at the same time. Only one that ...
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2answers
502 views

Suggestions for stepper motor controllers [closed]

I am working on a project where a dslr camera will be rotated on a tripod on 2 axes. I'm definitely using nema 17 motors as those are what I have. The motors will rotate 30 degrees every 5 seconds in ...
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1answer
83 views

CTL port in a motor controller [closed]

When I look at my 160A motor controller, it has a port that is called "CTL." What does CTL stand for? Is that a sort of protocol like RS232?
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2answers
246 views

What kind of motor control can I implement if I cannot use an Encoder?

Every time I see a PID control for a motor, it involves an Encoder, so the algorithm knows the real position of the motor or wheel. But with the robot I have, I cannot use an encoder. I only have ONE ...
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1answer
356 views

Dead reckoning on a car-like robot with a gyro and only one encoder

Recently I began to build a car-like robot and I stumbled upon dead reckoning. I use one motor for steering and one for traction. I want to be able to get the position of the robot. From what I have ...
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1answer
5k views

Quadcopter Throttle and PID mixing to Motor Speed

I've been writing some quad copter software and I am not sure what the best way is to map the throttle and PID inputs to ESC power. My throttle range is 0-1 and my PID outputs are 0-1. My ESC's have ...
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1answer
189 views

Robot start-up movement problems

I have created robot using a robot chassis kit from hobbyking. At first when testing the robot connected to USB power source and the wheels lifted above the ground everything seemed to be OK. Then, ...
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1answer
135 views

What's the difference between CAN's Motor Max Velocity vs. Profile Max Velocity?

CAN301/402 provides Max Motor Speed (0x6080,0x00) and Max Profile Velocity (0x607F,0x00). In profiled motions, the maximum speed is limited to the lower of these two values. In non-profiled motions, ...
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1answer
178 views

H bridge for rover

I am building a 6 wheeled rover, one set of 3 wheels will work together and other set of 3 wheels will run together, so current in each side may vary from 3A-15A(blocked rotor) and 6V i want to make a ...
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3answers
7k views

How to decide about the length of a robotic arm, the base of it and the torque?

I am designing a remote controlled robot which will have a base with three wheels, two of them will be simple wheels at the back of the base and the third will be a ball wheel at the front. It will ...
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2answers
1k views

DC motor with encoder

Can anyone help me out here with this DC motor, especially the encoder part? I tried searching around for its datasheet but its as short as 1 page and the only spec I get are: Encoder: 1 pulse/...
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1answer
561 views

Can a rigid-prop quadcopter hover upside-down?

Most small quadcopters use rigid rotors with some fixed pitch. In principle, I can imagine it might be possible for such a rigid-prop quadcopter to hover upside-down, but that apparently requires ...
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2answers
336 views

Quadrocopter build - Do these parts look fine?

I am completely brand new to quadrocopter building. I am currently about to start building a Quad. I have done a little bit of research and was thinking of buying the following parts: KK2.1 Hobbyking ...
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2answers
120 views

Sourcing Motors for larger robots [closed]

I have been wanting to build larger robots and r/c cars for some time now, but one issue I have had is trying to find larger motors, in the range of electric wheelchair motor size. I found one set on ...
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2answers
241 views

Do servo motor specifications take into account the gear ratio inside?

I am looking at buying a servo motor for a an application that must be able to lift 4-5 lb at a rotational speed of approximately 1rpm. The servo motor listed here http://www.robotshop.com/ca/en/hitec-...
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1answer
690 views

What do we call a coupling with infinite range of rotation

In most situations, range of motion is limited by the fact that we need to carry power or information past a joint. So, past a certain point there are either cables in the way, or the cables would ...
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3answers
3k views

How to calculate the power required to drive a fan

I need to specify a fan motor combination and wondered if there are formulas that can work this out? The fan we are using is a crossflow fan: So I'm assuming the power required to drive it is derived ...
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4answers
2k views

Quadrocopter first build: how to tell if components play well together?

I'm building my first quadrocopter, and I'm trying to come up with a parts list that is suitable for a first build. I will use this to learn how to fly a quadrocopter manually (lots of crashes!), ...
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1answer
1k views

Low Amp FPV Quadcopter Motors

Why do FPV Quadcopter Motors (usually the more expensive ones) draw lower amps than regular motors? And why are they more squat(disk shaped) as opposed to normal motors which are about the same ...
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1answer
3k views

How to: Attach wheel encoder to motor?

I have a couple of these DC motors http://www.pololu.com/product/2202 Which have an extended motor shaft that sticks out the back and is 1mm diameter. I'm having trouble trying to think of the ...
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1answer
6k views

What motor to use for reciprocating (reversive) movement [closed]

I want to make a copy of this machine Fisher Price Soothing Motions™ Glider and I'm wondering what motor to use? Simple DC motor with appropriate gearbox (slow rpm) or stepper motor? Here is another ...
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1answer
112 views

Emulation of an Orrery

Orrery is a clockwork model of the solar system. I am trying to emulate one in 2D. Now, to emulate, I need to know what goes on inside. Can someone please explain the basic principle behind the ...
3
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1answer
127 views

Once you understand motors, what's the next step? [closed]

I've gone through tutorials on how to build circuits and control dc, stepper, and servo motors. I may not understand everything about them internally, but i have a good basic foundation. Now i'm ...
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1answer
350 views

Flipping an old manual switch (physical one) [duplicate]

I Have an old audio amplifier that has those switches to turn it on. I'm looking for the simplest motor/robotic arm (or any other relevant component) to control this switch - eventually via Raspberry ...
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1answer
250 views

What is the purpose of electronic braking in motors?

I have a Micro Magician v2 micro controller. It has a A3906 Dual FET “H” bridge motor driver built in. In the manual it states "Electronic braking is possible by driving both inputs high." My first ...
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2answers
3k views

What are the different types of electric motors?

I am beginning to learn about the hardware aspect of robotics, and in order for a lot of this new information to be useful to me (whether on this site or elsewhere) I will need a basic understanding ...
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1answer
4k views

Low speed control of bldc motors

I'm having a problem with controlling my BLDC motor when starting up and when running in low rpm. I have a custom board to measure rotation of the motor using an optical sensor and send servo pwm ...
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1answer
186 views

Lawn mower robot (type of cutter)

If not all, but major types of lawn mower robots are rotary mowers. I presume1 that reel mower is more efficient, and is said to leave a better lawn health and cut. So, why industry go to the other ...
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2answers
1k views

Odd L293D behavior: Pin 16 seems to act as enable

I have a chip that is labeled L293D with a small 'ST' logo, which does not behave like I believe a L239D should: I have the chip on a breadboard with pins 4,5,12 and 13 connected to the ground rail. ...
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3answers
2k views

Encoder based speed control for Rover 5

I am trying to get precise control over the speed of rover 5 based robot. It has four PWM controlled motors and 4 Optical Quadrature Encoders. I am using 4-channel motor controller with rover 5 ...
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3answers
2k views

Pre-built PID motor controller [closed]

I lead a university robotics team that needs PID controllers for four drive motors and two additional motors that are used in a secondary system. I would strongly prefer to buy pre-built PID ...
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3answers
981 views

DC motor direct loading

I found many tutorials and online calculators for the selection of dc motor to drive wheel, I understood how the torque affect the driving of wheel. But what happen when I change the orientation of ...
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3answers
549 views

How are the optical encoders used in platforms like Rover 5?

I just got my rover 5 chassis with 4 motors and 4 quadrature encoders and I am trying to utilize the optical encoders. I know the encoders generate pulse signals which can be used to measure speed and ...
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2answers
473 views

Mechanism for changing gears on a bicycle

I'm looking to make an automatically shifting bicycle for my senior design project (along with some additional features TBD). However, I come from an electrical/software background; not a mechanical ...
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1answer
1k views

Effective motor type for robotic arm?

I am trying to build an arm that will have about 5 by 5 by maybe 7 or so centimeters of room for a rotary motor capable of lifting it. The joint will basically allow the arm to rotate in a single ...
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2answers
480 views

Why do 1000 rpm and 10 rpm DC motors cost the same? [closed]

Today I was going to buy a motor online, and saw that 10 rpm and 1000 rpm DC motors cost the same. How is it possible to change the rpm without requiring any additional parts cost?
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1answer
682 views

How to control a brushless motor?

I consider using a brushless outrunner motor, designed for helicopters, in my driving roboter. How can I control such a brushless motor with my micro controller? Of course I'll have a separate power ...
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0answers
303 views

Motor Controller with micro USB interface [closed]

I am a Robotics enthusiast and planning to make a small and simple four wheel car whose motors are supposed to be controlled by an Android device housed inside the car by means of the micro USB port ...
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4answers
14k views

What is the difference between RC motors for cars and helicopters?

I am working on a robot with focus on speed. At the moment I am looking for a suitable motor but it world help if I understood the difference between the various options. To provide some background, ...
6
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1answer
178 views

Do 6 motors require 6 individually-assigned batteries?

For the Dagu Wild Thumper 6 Wheeled platform, or any multiple motor system, do I really need 1 battery for each motor? Or should I just buy 2 for either side of the platform. In addition, for larger ...
3
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1answer
249 views

Does a vehicle with defferential gear still move straight?

I am in the concept phase of a driving robot. The two wheels on the front axle will be powered, while the rear will be dragged along. The rear is also responsible for steering but this has noting to ...

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