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 ...
- 725
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 ...
- 4,416
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 ...
- 301
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 ...
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
...
- 1,346
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 ...
- 344
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 ...
- 953
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 ...
- 385
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 ...
- 681
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 ...
- 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 ...
- 15.9k
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 ...
- 71
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 ...
3
votes
What is the difference between DC motor with encoder and DC with out encoder?
Fundamental difference is closed loop feedback. Without encoder you just know how much speed you sent to engine, but have no information about speed that is on it - lower battery voltage will decrease ...
- 450
3
votes
Harmonic drives in hobby projects
It is also worth thinking about why you want to minimize backlash. Is it something intrinsic to the task your arm needs to perform?
Industrial robots use these drives to minimize backlash ...
- 230
3
votes
Accepted
Will this have more or less lifting strength
Every action has an equal and opposite reaction. Each motor/joint in a linear chain of actuators (snake) needs to be capable of supplying the appropriate reaction forces.
This mean that, if you have ...
- 15.9k
3
votes
Accepted
What is the typical weight distribution for a brushless motor?
I took apart a Turnigy D2836 brushless DC motor. Despite the weight listed on the website, the actual weight of the motor without the mounting equipment is 54 Grams.
Here is the breakdown
Magnets: 9 ...
- 195
3
votes
Accepted
Handling PID DC motor control at low speeds
I came up with a solution in the end.
Fire a periodic interrupt at a fixed rate (In my case, I configured the STM32 to fire a systick interrupt every 1ms
In the ISR for the 1ms timer, decrement a ...
- 91
3
votes
Accepted
TWIP robot - DC gearmotor speed/Encoders
:EDIT:
Let me put some numbers on this.
Let's say you want to get from any angle to vertical in half a second. Say for now (more on this unrealistic scenario later) that you want to get from "...
- 15.9k
3
votes
Scara robot design
One of the problems with a belt driven SCARA system like this is that as the belts age, they stretch, so every belt should have a tensioner.
If you look carefully, it is clear that plate 106 rotates ...
- 4,273
3
votes
Accepted
How to maximize stall torque of a motor
One relevant equation is the lorentz force equation. which suggests that if you want to reduce current then you need to increase the magnetic field.
The magnetic circuit is complex, with different ...
- 4,455
3
votes
Best way to estimate velocity of motor with encoder
You could employ all the techniques you mentioned that are model-based though, meaning you need to provide a good model of your system and then tune the parameters.
Alternatively, there are other ...
- 4,020
3
votes
Will a change of motor driver improve motor performance?
If you want to test the motor, just apply a DC source to it directly rather than using the l298.
A 12V car battery is a source you likely have access to that can supply enough current so you can test ...
- 4,455
3
votes
Accepted
What are the equations of a s-curve position path?
To come up with a mathematical expression of the position reference $x\left(t\right)$ as a function of time $t$, we can inspect the profile of the acceleration $a\left(t\right)$. It is piece-wise ...
- 4,020
3
votes
Accepted
Unlabelled pins on this L293D dual DC motor driver
A Google Image search on L293D board suggests that this is a widely available board manufactured by (or at least designed by) Deek-Robot.
The 5 pin connector mostly duplicates pins on the 6 pin green ...
- 4,273
3
votes
Accepted
How to calculate the right needed Power?
The maximum (or required) torque alone is not enough for sizing a motor, it is one of the factors.
Motor maximum (sometimes refereed to as peak) torque differs from nominal torque. The maximum ...
- 6,682
3
votes
Accepted
Why applied joint torque will affect another joint?
When you apply torque to the first joint, it makes the first link rotate. This means that the far end of the first link translates.
Because the second joint pins the near end of the second link to the ...
- 619
3
votes
Accepted
Choosing the right dc motor
Your maximum power is already given by the driver.
Assuming that 24V motors are easier to come by, $$24V * 43A = 1023 W$$ electrical power. I am assuming that you have the combined maximum output at $...
- 6,682
3
votes
Quadrotor dynamics: How is torque created
Each motor generates torque to spin it's fan. As the fan turns, the quadrotor will experience the same torque on the frame, only in the opposite direction.
This is similar to a helicopter - the tail ...
- 131
3
votes
gear motor with encoder and Arduino Uno
The motor should not be connected directly to your power source since this will not allow it to be controlled by the Arduino. The encoder is a passive add-on to the motor (mechanical coupling only). ...
- 191
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