# 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.

64 questions with no upvoted or accepted answers
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### Is it possible to regulate the amount of counter torque in a generator?

I have a question for a machine I am working on, The machine is used to pre-tension steel wire ropes for maritime uses, the wire rope sits on a drum with a 2m diameter. The tension has to be ...
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### How to drive electric power steering motor

I want to drive an electric power steering motor from an European Opel Corsa C in a way that I can control the steering of the car programmatically. I have a steering angle sensor which I will to use ...
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1 vote
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I work with compressors and usually the starting characteristic for fixed speed machines with starters is that the machine starts unloaded (star starter), after that the compressor unit is loaded and ...
1 vote
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### Achieving zero torque from DC motor

The current project I am working on requires a motor to provide ~2 Nm to a spinning shaft and then upon command provide ~0 Nm, hence acting like a bearing. The motor will have an attached encoder, and ...
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1 vote
107 views

### DC Motor Time to Attain Full Speed Formula Origin

There is no formal discussion but I see a formula that relates the average available torque to moment of inertia in problems from Electrical Technology by Theraja. I have tried searching about this ...
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### How to obtain torque constant for stepper motor?

I want to measure the torque constant of a stepper motor but seems I am doing it wrong. I have an MST342C02 stepper motor (200 step/rev and 4 phases) with SMD42C2 Driver. I have a converter that gives ...
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1 vote
967 views

### Meaning of motor constants for three-phase PMSM

When looking at three-phase permanent magnet synchronous (brushless) motors, $K_T$ and $K_V$ numbers are often specified. Also, controllers for these motors typically specify maximum currents. ...
1 vote
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### Stepper motor torque requirements

I have a robot that has a load of 60kg and it has to move using 4 stepper motors. I saw from previous searches that the torque required by the motors to move is Force times the wheel radius. COF = 0....
1 vote
1k views

### high torque and high rpm dc motors

I am making an electric 4x4 car, will it make a difference in overall speed if: Case1: all 4 motors are high torque and relatively low rpm Case2: 2 high torque relatively low rpm and 2 high rpm ...
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1 vote
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### How to determine velocity profile for two stepper motor in robot driving

A robot has 2 parallel driving wheel. I don't know the friction of the ground surface. However, I can set the acceleration, starting velocity, ending velocity. The velocity profile has to be ...
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### Motor and Controller to spin Camera Array

I am in over my depth with respect to motors and drive hardware, and hoping to get opinions of appropriate motor and driver options. Project: Environmental device that must spin a 1lb rotor (a cube - ...
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### Is power low for a high speed fan?

Got a question for my lab telling that the power consumed is low at higher speeds, why is it so? couldn't find any source backing up this statement too I did find this graph of torque vs speed, so I ...
107 views

### Designing a unipolar stepper driver using STM32 MCU, lack of torque

I am working on my first robotics project which will hopefully become a desktop sized KUKA iiwa. Unfortunately, I have only just completed the first year of my electrical engineering degree so have ...
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### What is rotor torque in the stepping motor context?

I have the following datasheet for a stepping motor. I am wondering what "Rotor Torque" means in the stepping motor context. My first guess would be the torque produced by the rotor under ...
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### Can not get maximum torque (stall torque) when current reach peak current

I am using FOC to control torque of 220V AC servo (SPMSM) with 36V power supply at low speed (100-200rpm). I tested with some servos (different manufacturers) which has specs as the below table. But I ...
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### VFD Driving a 40HP Inverter Rated Motor showing high Torque, Output Current at Low Speed

I am having some difficulty troubleshooting a Toshiba VFAS3-4300PC. I am using it to run a 40HP inverter rated motor that is driving a VRU Screw Compressor. I have the frequency range set for 12-60Hz. ...
49 views

### BLDC torque and speed control

Actually I drive a DC motor in speed and torque at the same time. I would like to know if there is a solution to do the same with a BLDC. The motor is 50W max. I can make a custom PCB to use a BLDC ...
114 views

### Reverse engineering a torque sensor

I am trying to reverse engineer a torque sensor. I have found the two data lines that are providing the torque value output to the ECU. Here are the waveforms that I have captured that show max. ...
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### Need help figuring out how to organise a system to run a stepper motor at low speed without Steps-skipping

TL;DR : How to prevent step-skipping with a NEMA gearbox motor at low speed. Edit: following @glen_geek comment, removing the load on the system seems to remove the problem, hinting at inertia and ...
31 views

### How much lower than the ideal torqe curve is the actual torque of a PMSM running at overspeed?

VFD-controlled PMSM's are said to produce constant maximum torque up to the rated speed. Above the rated speed the VFD performs defluxing and produces constant power. This should then mean that at 200%...
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### How to calculate torque of a three-phase induction motor?

I have a three-phase induction machine with following nameplate data: $V_{s_n}=\frac{425}{\sqrt{3}}\,\mathrm{V}$ - effective value of the phase voltage, $f_n=70\,\mathrm{Hz}$ - nominal frequency, \...
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### Transfer function of two frequency spectra

When you have two amplitude frequency spectra (fourier spectrum), in this case of a torque ripple, how do you define the transfer function (or the ratio) between both? How do you "divide" ...
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### Choosing a motor

Long time listener, first time caller etc! Also, if you think this could be better answered somewhere else please let me know. I'm building a pottery wheel at the moment and I'm in a bit of a quandary ...
37 views

### What is the effect of the capacitor on the input power and torque of permanent split capacitor (PSC) single phase induction motor?

I need to know the effect of the capacitor on the input power and torque of a permanent split capacitor (PSC) single phase induction motor.
3k views

### How to calculate torque constant and back EMF constant of a BLDC motor?

I have a BLDC motor to run for a fan. The parameters are as follows: Electrical frequency measured: 61.936 Hz Pole pairs: 8 Line voltage measured: 70.365 V RMS Line voltage peak: 99.51113732 ...
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### Q: Motor sizing for reeling application

I would like to ask for some help. My application is regulation of vertical speed of the camera, which is mounted on winding/unwinding reel. The camera follows the object (which moves vertically). The ...
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### What type of motor should I use in a conveyor and how should I design it?

I need to motorize the following conveyor : It consists of 2 rolls and 9 round belts. The length L is 50 cm, the width l is 20 cm and the rolls have a radius r of 3 cm. Only the first roll will be ...
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### Motor controller structure for constant torque starting and then switching to constant speed

I need to design a field-oriented-control (FOC) controller for a permanent magnet synchronous motor (PMSM) with position sensor. In the starting process where the motor goes from zero speed to rated ...
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### How to power (from AC) & set varying overcurrent limits on the fly for 12 V DC motor

I am trying to use a 12 V geared down (high torque, low speed) motor in an exercise application. I want to be able to roughly adjust the load akin to adding more physical weights on a traditional ...
231 views

### DIY Ebike BLDB motor controller, low torque, is it my motor?

I've designed a 3 phase inverter for driving a BLDC hub motor. The design (if anyone wants to look at schematics, is here). This works well, the motor spins up and down fine, no worries. However, if I ...
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### Torque developed by Star Connected rotor

The current in each phase of a Y-connected rotor winding is 200 amperes. The resistance per leg is 0.003 ohm. Determine the torque developed by the rotor at a slip of 3%. I don't understand how to ...
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### Why don't I get a bell curve in the torque vs rotor position plot?

I have designed a inset PMSM. I tried to plot the torque vs. rotor position plot but I am not getting a bell curve. Like at the torque must be maximum only when theta is 90 degrees. I don't know where ...
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### TRT-25 and Arduino Uno

I need help on a project I am working on. We are trying to integrate a reaction torque sensor and I am having a hard time deciding how to go about it. Previously I assumed that like my load cell I ...
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### Testing DC motor with a torque wrench

How can I measure the torque of a stalled DC motor @ 6V using a torque wrench? I'm trying to test my DC motor with the torque wrench method (regular torque wrench used for cars).
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### Measure torque with a BLDC motor

I'm trying to build a bench test in order to measure the torque required to put and keep in rotation a brake which function with friction. The rotational speed for this test is slow (15 RPM) to be ...
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### Is torque constant times the motor current the only way to estimate torque feedback in a servo motor?

Consider a torque and position tracking servo motor. Once the motor reaches the target position (assume no external torque applied), the end effector should apply a torque which tracks the torque ...
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### Accurate Static Pulling (with electric motor?)

I am trying to see if I could accurately apply a static pull to a cord to create tension. I should not be measuring the tension directly, only be sure that the pull I apply is the force in Newtons ...
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### How to make a synchronous generator unstable

I was try to analyse what factors can affect the stability of synchronous generator . Let's say a synchronous generator working in isolation and some loads are connected to it and we have to make it ...
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### Universal motor torque measurement

I would like to control AC universal motor (brushed). I would like to know the load torque, but I cannot measure the torque directly. I have to calculate it from motor parameters. Please let me know ...
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### How reliable are motor power ratings through time (old motors vs new motors)?

I'm making this question here because I'm a little bit confused with what I've been seeing from some old and new 1/2 hp motors. I've bought a 1/2 hp induction motor (4-pole, single phase, capacitor ...
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### BLDC Motor question

Im looking for a solution, i have a 3kW 320V 3000rpm rated BLDC motor with position hall encoder and a chinese driver. The hall-feedback is working with it. I would like to use motor between 15 and ...
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### Is the calculation of weight to be suspended inorder to produce electricity from an alternator correct or not?

I bought a alternator with the following specs: power: 5 hp rpm: 1800 voltage: 220V The formula for finding the horsepower is: horsepower= (RPM X Torque)/5252 By substituting the value of horsepower ...
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### DC Motors Voltage Equation versus Power Equation

I understand the voltage equation and the power equation for DC motors. But somehow I have a problem understanding moving from one to the other. I am not interested in the IR or IdL/Dt so I will ...
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### How does gearing affect power generated by a permanent magnet DC motor?

I am currently working on a project to harvest electrical energy from a rowing machine. I am trying to make use of gearing ratios to adjust the resistance level offered by the system, and the impact ...
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### Confusion with peak and RMS values when calculating the torque of an electric motor

For electric 3-phase motors with a efficiency of 100% (assumed here for simplicity) the following equation holds: $$P = \omega T = 3 U I$$ where $U$ and $I$ are the phase RMS values of the ...
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### How to determine the right spec of a servo motor given an inertia moment?

I'm working on a trash bin which lid is controlled (opened/closed) by a microcontroller and thus i decided to use a servo motor. The lid is 47 x 47 x 0.1 cm and because its made from steel has a ...
65 views

### What affects the current ratings on constant torque pole changing motors?

Two different motors, one is rated 1.49A on slow speed configuration and 1.43A on high speed. The other motor is rated 6.09A on slow speed and 6.99A on high speed. These are constant torque pole ...
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### How to select power source for robot actuator with known torque requirement

I am building a robotic actuator that will be backdrivable, this robot will have pretty low RPM. I will be using brushless DC motors. I am trying to figure out requirements for the power source. I ...
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### Calculating Joint (Load in lbs or Kn) requirement for a compression lug on top of a bus bar

I have found myself in an interesting scenario that is actually more mechanical in nature but maybe you guys can point me in the right direction. I am having a hard time finding any ISO, IEC, or ANSI ...
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