Questions tagged [torque]

For questions about torque as it relates to electronics. Consider using in conjunction with related tags such as "motor" (and more specific motor-related tags), if applicable.

Filter by
Sorted by
Tagged with
44 votes
8 answers
307k views

How are current and voltage related to torque and speed of a brushless motor?

I know that electric vehicles have different performances depending on battery and motor, but it's not clear how electrical and mechanical units are related. Will a 100V motor raise against slopes ...
jumpjack's user avatar
  • 870
23 votes
7 answers
180k views

Torque kgcm (what is kgcm)?

I know what torque is but I find difficult to understand what Torque: 3kgcm means ? I am not sure, how much weight that motor can carry, and I want to know how I can calculate that. Please give me ...
Splendid's user avatar
  • 341
13 votes
4 answers
35k views

Stall torque for servo, kg/cm?

I've recently bought some cheap TowerPro SG-50 rc servos from ebay. They seem to work quite well, and despite their small size they are quite strong. But how "strong" are they actually. The datasheet ...
bjarkef's user avatar
  • 738
10 votes
3 answers
9k views

Is it possible to determine load on a stepper motor when stopped

Is there a way that the torque on a stepper motor can be determined without some kind of additional force sensor. Additional electronics such as current shunts etc would be acceptable. I would like ...
Hugoagogo's user avatar
  • 2,445
9 votes
7 answers
91k views

Torque relationship to speed in a DC motor

I have a conceptual doubt about torque-speed relation in a DC motors. It's probably a gap in my thinking but I'm posting this question anyway. Torque and speed in a DC motor are said to be inversely ...
Vineet Kaushik's user avatar
9 votes
4 answers
9k views

Brushless motor specs to maximize stall torque

I'm interested in a brushless motor having a high stall torque (not much in RPM). What specifications of a BL motor would give a fair indication of its stall torque, provided that voltage is fixed ( ...
Déjà vu's user avatar
  • 281
9 votes
3 answers
413 views

Measuring force developed by a robot

I've been playing around with a Lego Mindstorms NXT robot, gearing it for speed and power. To my dismay, when geared for power, it wasn't any harder to stop than when geared for speed -- I suspect ...
Clinton Blackmore's user avatar
7 votes
2 answers
9k views

Result of constant current through DC motor under different loads

I've done some research on brushless DC motor and have a few questions what would happen when a constant current is sent to a DC motor. From my understanding, the current is directly related to the ...
user35266's user avatar
6 votes
5 answers
1k views

Can I measure torque accurately by an electrical or electronic method?

I am a Btech. student from India. We have been given a project in which we have to design a micro-torsion testing device. We are planning to clamp the specimen and rotate one end by fixed angles ...
Atharva Kulkarni's user avatar
6 votes
1 answer
136 views

Torque measurement device calibration

I don't know if I'm at the right place to ask this question but here is my trouble : I'm trying to find a good way of calibrating a electronic device used to measure small torques (0 -> 25 mNm). ...
Andy M's user avatar
  • 163
5 votes
3 answers
565 views

About the torque-free charging operation

I and one of my friends are working on understanding the below context (paper link): The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on ...
Soheil Paper's user avatar
5 votes
4 answers
13k views

Is there a standard for maximum torque that should be used to fasten PCBs to an enclosure?

I am looking for a standard or guideline which describes how much torque should be used to fasten a PCB to an enclosure using different types of fasteners. For example, we use M3 hex nuts in a ...
SomethingBetter's user avatar
5 votes
2 answers
11k views

How to electrically brake a brushless motor

I'm sorry if this question is too stupid, unfortunately I have a very low experience with BLDC motors. I would like to use 4 x 350W, 24VDC brushless motor hubs for my wheeled robot (they are usually ...
Marcus Barnet's user avatar
5 votes
3 answers
7k views

If a high rpm motor is run at lower rpm, will it produce more torque?

I did the following calculations: Max current = 1.2A, Max voltage = 12V Then power = 14.4 watts = 0.019hp Rpm = HP * 5252 ÷ torque I need a torque to 2kgf-cm = 0.144 lb-ft Gives rpm= 698. Thus this ...
Aether's user avatar
  • 193
4 votes
2 answers
13k views

Difference between torque and speed in dc motor?

I have knowledge about the definitions about both speed as well as of the torque. But I am unable to think dc motors in terms of speed and torque. When the armature of a dc motor rotates , we call it ...
Vibhu's user avatar
  • 243
4 votes
3 answers
2k views

DC motor spins faster in reverse

Due to certain circumstances I need to run my brushed DC motor in reverse (positive to black wire, negative to red wire). What I noticed is that when set up this way running at no load requires 1.5A. ...
php_nub_qq's user avatar
4 votes
4 answers
2k views

Electrical Motors and Frequency

I was musing about electric motors after seeing one randomly on TV, and there's something I'm must be remembering incorrectly. It's just a thought experiment, so I'm imagining some theoretical DC ...
amazonprime's user avatar
4 votes
4 answers
1k views

Can I use stall torque to calculate torque constant?

I'm using torque control for my project, and dc motor manufacturer doesn't give me the number of their motor's torque constant and motor resistance. I can use multimeter to measure the motor's ...
Uchiwuwu's user avatar
4 votes
2 answers
32k views

How to calculate the weight my DC motor can move?

I've that 12V DC motor with gearbox in the picture. These are the specs of that motor: Voltage = 12V No load current = 250mA Sall Current = 5 A Stall Torque = 20 Kg/cm Motor Rated RPM = 133 Shaft ...
Ahmad Oweda's user avatar
4 votes
3 answers
434 views

Motor Induction motor design specifics

I wanted to know the difference between the motor(s) used in the Tesla Model-S and commercially available motors. (source: insideevs.com) eBay Motor^ I have been very confused. They both are ...
Sam Mottera's user avatar
4 votes
2 answers
2k views

Understanding electric DC gear motor for project

I would like to build an Arduino controlled coin sorter and counter. I want to use a spinning angled disk with holes in them to pick up individual coins. I have been looking at some 3V DC geared ...
Michael Frey's user avatar
4 votes
1 answer
512 views

Old Record Player Motor Doesn't Have Torque To Start

I am restoring a jukebox from 1953 (AMI E-120). Everything is going fine except the main drive motor, an A/C induction motor, cannot start under the load of the platter. It starts fine when the ...
Dicer's user avatar
  • 141
4 votes
4 answers
3k views

Control torque of 3-phase AC motors

Actually, we have 1x30HP, 2x10HP motors working at our workplace. When we start the motors there is a lot of torque generated due to which our grid supply charges us penalty every month. We need ...
zeeshan hum's user avatar
4 votes
1 answer
1k views

Motor torque control with PWM : how to measure current?

For my caving robot project, I have 8 motors for which I need torque control (they will mainly be stalled or nearly stalled.) Each motor is driven by a DRV8801PWPR H-bridge (commanded by one digital ...
Sandro's user avatar
  • 7,277
4 votes
2 answers
2k views

Calculating total torque of stepper motor to lift and rotate some weight

I am going to design a system that would be control remotely. The system consist of stepper motor and solid cylinder rod of about 30 inches long and needs to lift about 0.5 lb/0.223 kg mean up to 90\$^...
Wisal's user avatar
  • 143
4 votes
1 answer
277 views

How do I determine the curve of the transmission output on a torque-angular velocity graph for a DC motor?

I'm doing a homework problem that involves motor characteristic graphs. For this problem, I have a motor with stall torque of 8 N-cm and a no-load angular velocity of 80 rad/s. The motor powers a 4-...
suhh_drude's user avatar
4 votes
5 answers
5k views

Controlling electric power steering using an Arduino to emulate torque sensor

I am trying to control an electric power steering rack with an Arduino. To do this I need to "trick" the EPS module that there is torque being applied when there really isn't. On the rack there are ...
Andrew's user avatar
  • 43
3 votes
3 answers
7k views

Why is there a pull-up torque during the starting of an induction asynchronous motor

taking into account the definition of pull-up torque: Pull-up Torque: The Pull-up Torque is the minimum torque developed by the electrical motor when it runs from zero to full-load speed (before ...
Ernesto Sastre's user avatar
3 votes
4 answers
34k views

How to decrease the motor Speed without losing the maximum Torque

I am using MDS40A motor driver(http://www.cytron.com.my/viewProduct.php?pcode=MDS40A&name=SmartDrive40) to drive a power window motor (12V, brushed motor) similar to the one at (http://www.cytron....
Robert's user avatar
  • 113
3 votes
3 answers
10k views

How to find stall current of servo motor?

I am using 18 of this hobby servos for a hexapod, that are going to run simultaneously. Now I need to decide the power source, and need to determine the current needed. I know that the maximum current ...
Nafis's user avatar
  • 147
3 votes
2 answers
5k views

Controlling the "amount" of regenerative braking (variable back torque?)

I have a question I have been wondering about for a while regarding regenerative braking on electric vehicles. If my understanding of electrical motors is correct In a perfect world with no friction ...
Sam Charles's user avatar
3 votes
3 answers
715 views

Torque control of a BLDC motor

Please forgive my lack of perfect electronics knowledge. I am here to learn. I understand I am clearly missing and misunderstanding something important. The aim of this question is to find out what it ...
DarreeN's user avatar
  • 31
3 votes
2 answers
6k views

Calculating the amount of torque needed to turn shutter

I'm working to design a motor to control a mechanical shutter. After considering some other possibilities I have decided to try using a stepper-type micro motor. We're using a shutter from Edmond ...
speciousfool's user avatar
3 votes
2 answers
10k views

What happens to the torque/speed curve of a brushless motor when I increase the voltage?

Here is a an image of the torque/speed curve. My guess is that increasing voltage will simply translate the curve up because the slope is the torque constant, which is a physical motor property that ...
Ryan C's user avatar
  • 67
3 votes
5 answers
5k views

Sensing BLDC motor torque using a current sensor

As it is commonly known, the torque supplied by a motor is directly proportional to the current it draws. So when a motor is under heavy load, the torque required will be more hence it would draw more ...
Tarang Shah's user avatar
3 votes
4 answers
21k views

Calculate Back EMF from Torque Constant

I have a DC motor with a torque constant of 1.05 mNm/A. How do I calculate back emf constant from torque constant (mNm/A)? I have information that is in the maxon catalog.(DCX 10 S metal brush ...
봉하연's user avatar
3 votes
2 answers
15k views

What DC motor specs do I need to lift a weight with certain gear configuration

I'm trying to determine how much torque, power, voltage, and size I need for my motor in order to lift between 50-100lbs given the gear configuration below. Assume that the motor and gears are ...
user3625087's user avatar
3 votes
2 answers
845 views

Why does the rotor of a synchronous generator accelerate during faults?

I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator? Why does electrical torque decrease during a fault in the lines that ...
engyhya's user avatar
  • 31
3 votes
3 answers
504 views

How to make sense of speed vs Torque curves in speed control mode

I am operating my motor in closed loop speed control mode using motor controller. Toque vs speed curves gives us a relation between them which is one-one correspondence. But in a closed loop speed ...
BhanuKiran's user avatar
3 votes
1 answer
5k views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
user avatar
3 votes
1 answer
2k views

Servo Torque Calculator

Does anyone have an easy to use Servo Torque Calculator?
mad_z's user avatar
  • 5,050
3 votes
2 answers
2k views

Why are stepper motor phase currents a sinusoildal waveform?

I don't know if this is a really dumb question or not, but I've seen all kinds of torque, peak-current and RMS discussions related to current drive output for stepper motors. I acknowledge that for a ...
Nicolas Cavalieri's user avatar
3 votes
1 answer
3k views

BLDC speed/torque control with L6229 or L6235

I'm trying to control 12V 12,000 rpm BLDC motor with 3x120° Hall sensors using ST evaluation board based on L6229 IC. I tried to control motor's speed by feeding PWM to FWD/REV pin as suggested in ...
Ignas's user avatar
  • 31
3 votes
0 answers
58 views

DC Motor control PWM [duplicate]

I need to vary the speed of a DC geared motor using software (Raspberry Pi SW GPIO). The motor is 3 V DC geared micro motor @150 rpm. At 3 V full 'speed' the motor is very powerful for ...
user176326's user avatar
2 votes
4 answers
3k views

Can a DC brushless motor produce the same torque at different power levels?

I am looking these Neo Brushless motors for a project. Here are the links to the data sheet and also to stall testing from the company: http://www.revrobotics.com/neo-brushless-motor-locked-rotor-...
Ryan C's user avatar
  • 67
2 votes
2 answers
3k views

Torque and Flux Current

It is said that vector sum of flux and torque current equal to total current drawn by the motor but there are also some currents flowing due to copper losses and rotor leakage inductance. In my ...
d.alex's user avatar
  • 235
2 votes
5 answers
1k views

Fundamental understanding of motor torque

I have the following elementary question regarding motors: Motors provide mechanical torque as output. Every motor has a particular torque-speed characteristic curve which tells us how much torque the ...
Quadro's user avatar
  • 141
2 votes
2 answers
23k views

How to measure electric motor torque?

I need to measure torque output of a PM DC electric motor. My plan was to use a current clamp to log the current vs time, a voltmeter to measure volts vs time, and an encoder to log rpm vs time. ...
mrkevelev's user avatar
2 votes
1 answer
1k views

Torque-Speed Equation for Induction Motor

I am looking for the Torque-speed equation on an Induction Motor that is used to draw the curve.
scico111's user avatar
  • 877
2 votes
2 answers
471 views

How can I connect two motors in parallel with different RPM and voltage?

I have a kid's electric toy car with a 12 V battery and 2 DC motors (Model: RS380/6 V & 12 V with 15000 RPM) connected to battery in parallel and to wheels using gearboxes. For some reason, the 6 ...
Zain's user avatar
  • 423

1
2 3 4 5
7