# Questions tagged [current]

Flow of electric charge - typically movement of charge carriers, such as electrons. Measured in amperes (A).

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### How to calculate Current for pancake stepper motor - To change in Pronterface

DISCLAIMER: New to electrical engineering topics. I'm a 3d-printing hobbyist. I don't know all the Jargon being used but trying my best to keep up. PROBLEM Recently bought a Nema 17 stepper pancake ...
64 views

### Inner current controller benefits

I am currently working on a system with a BLDC motor attached to a non linear spring on which a user can apply a force. Meaning the torque applied on the motor's output is most of the time unknown. ...
13 views

### Calculating lift capability and current draw of quadcopter motors

I have seen a lot of posts citing this answer which gives the rough estimate that a quadcopter needs approximately 150 watts of power per kg in order to hover. I am trying to do some theoretical ...
117 views

### How to test how much current 9 servos can draw at a time? [closed]

Plus how should I use a multimeter to test it? P. S. Really sorry for a noon question.
22 views

### How to pick the right motor driver?

I have this brushed DC motor (Vex 775pro: https://motors.vex.com/vexpro-motors/775pro; motor curve data here I assume is useful but I do not exactly know how to make sense of it) My question is, how ...
27 views

### Can I use a breadboard to power multiple SG90 servos?

I am planning on using 10 Towerpro SG90 servos, which operate at 4.8V or 6V and can require a maximum stall current of 700ma. If I use a breadboard like this one (https://www.amazon.com/gp/product/...
3k views

### Servo motor power consumption issue

I am using servo motor model no. MG995 with Arduino. I don't know the current it consumes while powered on and while lifting a 10 kg of weight. I am currently using a 5 V, 1 A power supply with one ...
52 views

### How can a motor be run at higher voltage for longer?

A 12V windshield wiper motor to run at 24V for more speed but near-equal driving force. Testing with a variable DC supply between 21.6V & 26.4V showed the current maxes at 3.72 - 3.90A, as ...
702 views

### Can't Read current on Pololu Dual MC33926 Motor Driver Shield for Arduino

I purchased a Pololu Dual MC33926 Motor Driver Shield for Arduino, and for some reason I cannot read current from the motor controller. On the Serial.println() it just prints weird data (garbage), and ...
107 views

### Powering servos for quadruped spiderbot using arduino uno [closed]

I am using 12 towerpro SG90 servos. What battery should I use for powering 12 servos for my arduino uno? Can i use the 12v battery, plug it in to 12v dc jack of arduino and tap the 5v output of ...
931 views

### How to deal with current spikes due to fast direction-switching motor commands?

I'm trying to build a self-balancing two-wheeled segway-like robot. I'm currently using two 12v DC motors that draw approximately 600milliamps of current each. I've noticed that when my robot tries ...
481 views

### DC gearmotor stall current and battery capacity

I'm working on a self-balancing robot project and am in the process of motor sizing. I've read that with self-balancing robots the motors need to switch direction quickly, which can cause them to ...
59 views

### Electronic speed controllers and total current draw

Do we have to take Electronic Speed Controllers (ESC) into account when calculating the total current draw of the system? As far as I can understand, the motor and ESC are connected in series, so we ...
403 views

### Brushless DC motor problems at high velocities

For a project we use a brushless DC (BLDC) motor. Everything works fine until we tried to reach high velocities. I will first explain my setup, and than explain our problems using some graphs. 1.0 ...
224 views

### what is the difference between a voltage source and current source? [closed]

I know,this question is irrelevant.But,while working suddenly this question came through my head..my point is there should not be any difference between a voltage source and a current source.cause,...
497 views

### What are some ways to estimate torque/load on a robotic arm joint

My main problem is measuring joint torque/load economically. There are ways to detect the electric current drawn which is proportional to the torque. Since my motor is a BLDC motor, there will be a ...
960 views

### Can too much input current destroy my motor driver?

I have a 18 V rated driver I'm using to drive two 12 V DC gear motors using my Arduino. I bought a new battery pack which is rated 3300 mAh 25C, 11.1V making the total current input 82.5 A. My driver ...
2k views

### How can I reduce a motor's maximum current draw?

I have a motor with a stall current of up to 36A. I also have a motor controller which has a peak current rating of 30A. Is there any way I could reduce the stall current or otherwise protect the ...
136 views

### Comparison of the efficiency of DC motor current limiting / control methods?

I am using the wheels and motors of an RC toy car as a simple robotics platform. The car has 2 motors, one drives the back wheels, the other steers the front wheels. The steering motor is stalled by ...
108k views

### What is stall current and free current of motors?

What are the stall and free currents of an electric motor? For example, this Vex motor lists its stall and free currents at the bottom of the page. I think I understand the general idea, but a ...
198 views

### Power switch standards and suitability for purpose

I scavenged a 4 terminal power switch (Legion EPS 21) from some electronic device (don't remember what it was) and it has the following markings on it: Legion EPS21 10A 250VAC TV-5 8A/128A 250V &...
958 views

### Arduino with two Linear Actuators, two ACS714 Current Sensors, and an L298N Motor Driver setup

I am using the L298N motor driver to drive two HAD1 linear actuators (12V each and a no-load drive current of ~950mA each) Linear Actuator: http://www.alibaba.com/showroom/mini-linear-actuator-had1....
187 views

### Motor driver selection

I am building a 2 wheel robot to carry 7KG of load. I used this link to get the torque required for each motor which is 11Kg-cm. So I choose 2 of these motor which has 36Kg-cm(2x more) torque. I ...