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Questions tagged [current]

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

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1answer
24 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 ...
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4answers
48 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 ...
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2answers
29 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 ...
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0answers
34 views

What protection circuitry is required for tracked robot using Roboclaw controller, 313 RPM planetary motors, 12V AGM battery

I am trying to assemble a tracked robot (from Servo City) (Agent 390) with the following: -- two 313 RPM DC motors, stall current of 20A. I have tested the tracks w / motors, they draw around 0.5 to ...
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1answer
268 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 ...
1
vote
1answer
44 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 ...
1
vote
1answer
224 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 ...
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2answers
146 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,...
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1answer
89 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
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2answers
257 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 ...
1
vote
3answers
253 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 ...
1
vote
2answers
644 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 ...
1
vote
1answer
108 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 ...
2
votes
1answer
162 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 &...
1
vote
2answers
599 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 ...
0
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1answer
771 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....
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2answers
180 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 ...
5
votes
2answers
16k views

How to tell a stepper motor's position, or detect slippage

I am creating a CNC machine on a budget, using old motors out of printers/scanners/etc. I am limited to about 650mA for the whole system, so my fear is that when the cutting bit touches the material,...
5
votes
2answers
3k views

Arduino Vin Current Limit

I've found that Arduino (Duemilanove) has a current limit of 40mA per pin. Does this include the Vin pin? Or does the Vin pin have some sort of work around in place on the board to allow for higher ...
27
votes
4answers
80k 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 ...