# 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.

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### 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 ...
• 870
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.
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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 ...
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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 ...
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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....
• 113
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 ...
• 131
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 ...
37k views

Could someone give a (detailed) explanation (perhaps with formulas) of how the load (torque) affects the armature current of a DC motor (separately excited or shunt or series)? As the load torque ...
1 vote
2k views

### 12 Volt vs a 24 Volt Motor

I have read that using a higher voltage motor would need less current to get the same power. I understand that P = IV and how that works. My question is if the 24 V motor would get half of the current,...
• 115
1 vote
3k views

### Does increasing voltage increase the torque of a brushless motor?

1.) I have a brushless motor with testing data at 12V. I want to know if I increase the voltage supply, will this increase the torque? In my research I keep seeing "current controls torque, and ...
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3k views

### choosing the suitable DC motors

I'm working on a 4x4 robot that is supposed to carry stuff total_mass=100kg (including the robot). the robot should have average speed ...
• 185
2k views

### Motor to spin slowly, low torque [closed]

I am trying to find a motor to use to spin a cardboard wheel to drop balls through a hole. I want this to happen pretty slowly, around 10rpm. It also needs almost no torque, as it is spinning ...
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 ...
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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 ...
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 ...
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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 ...
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4k views

### Sizing a motor for a conveyor

There is a plethora of information on motor sizing on the internet discussing the rated voltage, current, torque and power of the motor, and how these parameters should be selected based on the load ...
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### How to calculate the torque constant for a BLDC motor

I am designing a 12lb hobby robot with a 1000Kv BLDC motor at 14.8V nominal voltage and stall torque of 30A. How do I solve for the torque constant. I have seen equations where Kt(torque constant) = 1/...
1k views

### Stiffness control of DC motor using PWM

Is it possible to control the output torque of a brushed DC motor using PWM? From my understanding the speed is directly proportional to voltage applied and torque is proportional to current drawn. ...
1 vote
703 views

### Understanding electric torque of a motor

I'm missing something fundamental in my understanding of the torque of a motor. Consider the following analogy: I have a 10kg dumbell on the ground and a 1kg dumbell next to it. Let's say that I ...
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1 vote
451 views

### In absence of leakage, what creates the angle between stator and rotor flux in an induction machine?

As per my understanding to produce torque from a machine, we need an angle between stator and rotor flux. In an induction machine rotor flux is created in response to stator flux, why is there an ...
1 vote
1k views

### Generating electricity by moving door handle to produce 3 Watts?

I want to attach a generator to a door handle and have the output charge a battery. My system needs to provide about 3 Watts. A similar question was asked here and I referenced it to get an idea of ...
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19k views

### What is the relation between the stator current and motor rpm for an AC motor?

A 3 phase AC motor is rated values are: 970 rpm, 50Hz, 380V delta 47A. A VFD drives this motor for obtaining a constant wind-speed which rpm is proportional. The thing is when 885 rpm the stator ...
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438 views

### How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh?

I am working on a 100 kWh capacity gravity battery bank. How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh? How many kWh would it take to lift the ...
611 views

### Producing a small homemade generator with reduced cogging torque

Background: I'm working on my second hobby small generator design. Particularly difficult to source are (relatively) low speed permanent magnet motors that can be run in reverse as a generator with ...
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