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8 votes
Accepted

Harmonic drives in hobby projects

The core reason for choosing harmonic drives is desire for zero backlash. Moreover, regarding mass and size, they become more beneficial for higher gear ratios as their size and mass do not scale for ...
JJM Driessen's user avatar
7 votes

Motor Choice given size constraint and load requirement

If you have some budget for your project, both Maxon and Faulhaber have good DC motors and motor-gearhead combinations. Maxon publishes a nice set of formulas and background theory on electric motors....
hauptmech's user avatar
  • 4,445
7 votes
Accepted

Using brushless motors for very high torque

Your expectations are rather aggressive for a DC motor. First - 40Nm (350in-lbs) is A LOT of torque! Ex: A max rated torque for 1/4-20 bolt is only 75 in-lb (8.5Nm). Second - The mechanical power ...
markshancock's user avatar
6 votes

Motor Choice given size constraint and load requirement

20kg is a mass. It makes a force on Earth (20*9.81 = 196N), but that's not a torque. Motors make torque - what is your maximum torque specification? Once you know how much torque you need (that will ...
Chuck's user avatar
  • 16k
6 votes

What are some ways to estimate torque/load on a robotic arm joint

Model Based: Low cost solution is always software: Develop a dynamic model which computes the load on the motors based on the motions (e.g. with Recursive Newton Euler Algorithm or Lagrange-Euler ...
50k4's user avatar
  • 6,682
6 votes
Accepted

What is the difference between DC motor with encoder and DC with out encoder?

As @szczepan mentions, the difference is one of feedback. There are many ways to get feedback regarding the motion of a dc motor. People implementing a control system will often put a mark on the ...
SteveO's user avatar
  • 4,396
6 votes
Accepted

How much weight can DC Motor carry?

Well, to answer this question for your special case, one needs more information about the motors. Maybe, you can supply a product code. And one needs more details of the involved mechanics... is it a ...
SDwarfs's user avatar
  • 301
5 votes
Accepted

Quadrature encoder signal from dc motor is very noisy

Conceptually everything was set up correctly, but a number of basic mistakes affected the signal. Here is the set-up which should be used to record the signal from one of the encoder outputs: A set ...
neuronet's user avatar
  • 233
5 votes
Accepted

Why to combine a Raspberry Pi (or similar board computer) and an Arduino for controlling motors?

The reason is Clock on the Raspberry Pi. Note that the raspberry is powerful but not that powerful that it can run an OS and simultaneously give you precisely timed PWM outputs. I assume that you'll ...
Kartik Madhira's user avatar
5 votes
Accepted

Equations of motion in matrix form and energy consumption

Can you set up the problem so that the quantities you care about (e.g. power) are more explicitly represented? Reasoning physically, where could the power go? Accelerating masses, including rotation ...
r-bryan's user avatar
  • 1,271
5 votes

What kind of motors do industrial robot have?

Most industrial robot have servo motors. This allows you to control velocity, torque and position of motors - the latter usually in some form of closed-loop control system. I work for Stäubli. Our ...
Jim's user avatar
  • 324
4 votes
Accepted

Can too much input current destroy my motor driver?

You are approaching the problem from wrong side. Current capability of a battery (25C) has nothing to do with that how much current will it actually source. It is the load (motors in that case) what ...
mactro's user avatar
  • 953
4 votes

Question about what motor to use for opening window

The other answers advocate the use of stepper motors. They can be easy to control by just sending a certain number of pulses to the stepper controller. However, they do not guarantee that you will ...
SteveO's user avatar
  • 4,396
4 votes
Accepted

What types of actuators do these industrial bots use?

Actuation is a complex subject that cannot be reduces to 1 component alone. It is the interaction of software electronics and mechanics. "Toy" servos tend to incorporate everything in one small ...
50k4's user avatar
  • 6,682
4 votes
Accepted

Need super-basic help with motor encoder

The "Green (Ground), Brown (Channel B), Yellow (Channel A), and Orange (Sensor Voltage +)" wires connect to the encoder on the back of the motor and allow the use of quadrature to detect the number ...
James Waldby - jwpat7's user avatar
4 votes

What is the torque/force required to rotate the base of a robot arm?

You need enough torque to overcome friction, and to accelerate the load. If you know the friction torque ($\tau_f$), and the mass moment of inertia along the motor axis ($I$), then the minimum motor ...
Christo's user avatar
  • 385
4 votes

Should I use an arduino to control my balancing robot's motors?

If you want to have a good balancing, PID loop timing is very important. Standard Raspberry OS, like Raspbian can't guarantee you any precise timing, so once your loop period may be 10ms, once it can ...
mactro's user avatar
  • 953
4 votes

What are the equations of a s-curve position path?

The S-Curve profile can have several divisions along the time axis 7 divisions as per this image. This example has a constant positive jerk zone, a constant acceleration zone, a constant negative ...
Akshay Kumar's user avatar
4 votes

No electric motors can handle being stalled for even short periods of time, even at low power. Is this statement true in all cases?

Electric motors designed for stall torque can handle stall torque just fine. One giveaway sign of high stall torque motors is forced cooling (cooling with a powered fan and not just a fan mounted ...
50k4's user avatar
  • 6,682
4 votes

Impact of using PID Output as a Change (Delta) vs Absolute

All PID controllers are relative in the sense that they act on a reference error, which is the difference between the reference signal and the sensed signal. Assuming the integral error starts at the ...
Chuck's user avatar
  • 16k
4 votes
Accepted

Will increasing voltage on brushless DC motor increase torque, if speed is kept constant?

It depends on various other factors as well. If the motor outputs 60RPM @24V under load, given the motor is rated for 12V - 60V and the load is kept the same, then by doubling the voltage from 24V to ...
S10's user avatar
  • 71
3 votes
Accepted

Steering using different speeds in DC motors or using a servo?

I have been working on upgrading an autonomous robot as part of a university project for the past year. As part of my work I have been switching the old skid steering system to a new active steering ...
TechAUmNu's user avatar
  • 121
3 votes

Tring to run 12 V DC geared motor using Samsung Li Ion ICR16850 batteries

A fully charged LiPo battery cell should has a voltage of 4.2 V. Assuming that you have three cells in series, that would give 12.6 V. When you apply a big load, this voltage of course, will decrease ...
Bence Kaulics's user avatar
3 votes
Accepted

Tring to run 12 V DC geared motor using Samsung Li Ion ICR16850 batteries

Assuming that the motor is in a healthy condition... Voltage is only one aspect, you have to be sure that you battery can supply the current drawn by your motor. The maximum current, according to ...
50k4's user avatar
  • 6,682
3 votes

Can i use DC Brushed motors for building a drone?

I would definitely look at a brushed motor when the budget is low. They have a reputation of being less powerful, but the main problem is they have a very high RPM. This means you either have to use ...
Henning Pedersen's user avatar
3 votes

Need help regarding odometry using Encoder motor and raspberry pi

You could maybe use Matlab to plot the position of your vehicle? This is how I'm trying to do that: I have a 'logging'-program running on the Raspberry Pi that counts each sampling time the pulses ...
Eva's user avatar
  • 155
3 votes

Running a cycle on brushless outrunner motors?

Let's assume you do a motor on the crank shaft rather than on the hub. When you step on the pedal/crank it's approximately the mass of your body doing all the work. $Torque(\tau)=Force*Distance$, $...
hauptmech's user avatar
  • 4,445
3 votes

Which kind of motors and how powerfull should they be for a robotic arm

This type of question "how much torque does my robot arm need" has been answered many times on this site: Simple equation to calculate needed motor torque Design and construction of universal robotic ...
Ben's user avatar
  • 5,865
3 votes

What types of actuators do these industrial bots use?

A robot like the one you refer to probably has a mix of transmission types that increase in power-to-weight ratio and decrease in size and stiffness as you move outwards on the kinematic chain. The ...
DXM's user avatar
  • 106
3 votes

Harmonic drives in hobby projects

Two parts: a) If we take into account the cost of harmonic drives and the fact that hobbyist projects aren't intended to make money (no revenue in return), harmonic drives aren't feasible at all for ...
AL-ROBOT's user avatar
  • 319

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