10 votes
Accepted

Simple equation to calculate needed motor torque

How quickly do you want to go from stopped to 10rpm? This will define your angular acceleration. Regarding calculations, first you should convert to standard units, so meters instead of centimeters ...
Chuck's user avatar
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8 votes
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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
  • 4,425
7 votes
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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
  • 16.1k
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
  • 6,662
6 votes
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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
  • 4,386
6 votes
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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
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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
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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
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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
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Relationship between motor torque and acceleration

Based on the calculations, it seems that any amount of torque can get the robot moving That is true only for a theoretical robot moving in vacuum without any friction in its mechanisms. Normally if ...
mactro's user avatar
  • 953
4 votes

Relationship between motor torque and acceleration

1) but the more torque, the faster the robot's acceleration: YES $$ F=\frac{Torque}{wheelradius} $$ and robot's acceleration is $$ a=\frac{F}{m} $$ so, from that equation you can see that linear ...
galtor's user avatar
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4 votes
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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
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4 votes
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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
  • 6,662
4 votes
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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
  • 6,662
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
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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

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
  • 6,662
3 votes
Accepted

What is a CIM motor?

CCL Industrial Motors according to this thread. So CIM is an acronym for the manufacturer of one of the motors the FIRST guys use. The term seems to have been generalized in that community to mean a ...
hauptmech's user avatar
  • 4,425
3 votes
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How to check for a sharp angle with a line follower?

It can't pass the 20 block if the robot enters it from a 15 or 20 block (so basically it gets stuck if it's coming from an angle and hits a 90 degree turn). Somehow coming from an angled line makes ...
Bending Unit 22's user avatar
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

Simple equation to calculate needed motor torque

Since the arm is in a vertical plane, certainly, motor torque is required to counteract the gravitational torque. Since it is a simple 1DOF arm with a rotary joint, the gravitational torque is $ \...
bluebird's user avatar
  • 173

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