An electrical actuator converting electrical energy into rotational motion.
15
votes
10answers
3k views
I'd like to learn how to make my own USB gadgets
I've been writing Linux character device drivers for other people's stuff for some time. I'd like to find a new hobby and the thought of making my own USB gizmos seems really neat.
I would be ...
10
votes
1answer
992 views
How can I implement regenerative braking of a DC motor?
I know that many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work? How can I ...
3
votes
1answer
4k views
Motor driver using only a 2N2222 transistor?
Is it possible to build a motor driver using only a 2N2222 transistor?
If yes, then how?
11
votes
4answers
2k views
How can I sense the motor's current?
I need to drive a DC motor @ 24V, 6A with a MOSFET. How can I sense the current that the motor is drawing with a microcontroller? I have to know when the motor is stalled.
7
votes
3answers
322 views
Why should I worry about a motor causing my supply voltage to shoot up when the back-EMF can't exceed the supply voltage?
I have heard people say that in motor control circuits, one must take precautions to keep the motor from feeding back into the power supply, causing the supply voltage to rise, consequently breaking ...
5
votes
3answers
877 views
Explanation for Differing Stator Winding Orientations
As a layperson, I'm trying to understand the basic configuration for an induction motor or generator. I've looked at many diagrams and photos/cutaways of stator wiring and I've noticed two different ...
7
votes
1answer
1k views
How can I measure back-EMF to infer the speed of a DC motor?
I'm interested in measuring the back-EMF of a motor to determine a motor's speed because it's cheap and requires no additional mechanical parts. How can I measure the back-EMF when I'm driving the ...
7
votes
4answers
4k views
DC Motor control with an Arduino
This might be a simple, silly question, but I am wondering why I can't just connect a DC motor to an arduino board to have it running. One pin to the ground and the other to one of the PWM outputs.
I ...
6
votes
3answers
3k views
Control differences between ac induction motor and brushless dc motor?
I have a fairly solid background in industrial AC motor control (soft starters, VFDs, etc.) but something that I'm certainly NOT well versed in is brushless DC motors... the type found in every hard ...
3
votes
3answers
892 views
Using a motor to open doors
I have made a wooden case to hold both my Xbox 360 and my PS3. It's as wide as both consoles laid down next to each other and as high as the console. it has 2 doors on the front, one for each console. ...
8
votes
3answers
10k views
How to drive a MOSFET with an optocoupler?
What's the proper schematic for driving this MOSFET from a microcontroller pin through this or this optocoupler?
The MOSFET will drive a motor @ 24V, 6A.
7
votes
3answers
695 views
Capacitors and motors
Every RC car I've cannibalized has had a small ceramic capacitor soldered on to the contacts of the motors. What is the purpose of having this? What happens to the performance of the motor with out ...
5
votes
5answers
5k views
Computer controlled water valve
I'm working on a computer-controlled indoor waterfall. One of the requirements is to be able to change the water pressure via computer interface. I've googled all day long and can't seem to find a ...
3
votes
2answers
1k views
AC fan speed control
I use this fan to cool my room, but sometimes it is too fast and I have to frequenctly turn it on and off to keep normal temperature. Maybe it is possible to reduce the speed by connecting a resistor ...
7
votes
2answers
1k views
Can Arduino Mega handle 6 motors independently
I wonder if anyone can help me
I am modifying an ROV and thinking of using Arduino Mega
I am new to electronics and robotics and wonder if the Arduino Mega can control 6 DC motors independently as ...
7
votes
5answers
418 views
Good motor supplier?
I'm looking to start a few different projects and stock up on some basic components - I was just wondering if anyone knows a good supplier of DC motors, stepper motors and servos?
I'm in vicinity of ...
6
votes
3answers
237 views
Is it valid to consider back-EMF in a DC motor equivalent to increased inductance?
I know that back-EMF can be considered as a voltage source in series with the motor which is proportional to speed. This is the common understanding, and I totally get it. Before I understood this, I ...
6
votes
3answers
198 views
Why Have Non-Zero Timing on a BLDC?
I've heard you can go faster in one direction if you adjust the timing, but do not understand why? I have a sensored bldc motor with a 30deg shift of the hall-effect sensors, tried going forward (CCW ...
4
votes
2answers
291 views
Can I use a DC SSR that is switched by a PID controller to control the speed of a 12 V DC fan?
This is my first post here. Let me start by saying that I do not have an engineering background. I tinker with electronics in my spare time (Arduino, solid state low-power guitar amps, etc.), but I do ...
4
votes
4answers
348 views
Overclocking my toothbrush
I use these toothbrushes: http://www.amazon.com/Oral-B-Advanced-Toothbrush-Vibrating-Bristles/dp/B00336EUV8
They tend to run out of battery quite quickly. I'm happy to keep buying more because ...
4
votes
3answers
494 views
How is precise control over motor as in Segway achieved?
When I read about Segway I always wonder how such precise control over the wheel motors can be achieved.
I mean if the rider wants to go one foot forward, then one foot back, he leans forward, the ...
3
votes
1answer
320 views
Recommend motor type to turn baby rocker, into auto-rocker
Would like to convert a baby bouncer (like this one), which requires continuous manual effort to rock it, into one that use electro-mechanical means to auto-bounce. However, my aim is to make these on ...
1
vote
1answer
105 views
Electromotor for large platform
For a design project I am designing a plastic platform with a steel construction under it, which has a diameter of 4 meters which is able to support 15 persons. The platform should be able to rotate ...
1
vote
1answer
216 views
Automatic Rotating Platform [closed]
I would like to build a very simple, circular wooden platform that rotates automatically - no stopping. The torque is not very important, as it doesn't need to support much weight. As far as rpm, ...
1
vote
2answers
666 views
Controlling multiple motor drivers with one Arduino
I have one Arduino and I need to be able to control five to seven 12V motors that each draw about 4 amps.
Would I be able to use four Sabertooth 2X5 Regenerative Motor Drivers for this? Each driver ...
1
vote
2answers
2k views
L298 Motor Driver spinning motor only one way :/
i just made a motor driver circuit on a veroboard to use with my arduino
but the problem is l298 spinning motor only one way.
here is the code
it was supposed to spin motor forth and backwards every 2 ...
0
votes
1answer
272 views
Need help on speed control of single phase ac induction motor
I'm working on a project "single phase ac induction motor speed controller". The spec of the motor that im going to use is
230v,1/8hp ,8000rpm@no load
I want to know whether it is possible to ...
0
votes
3answers
683 views
how to find out wether the stepper motor is working or not?
I have unipolar stepper motor with 6 wires and i have made controller circuit but when connect controller to stepper motor it is not working.. So i want to know weather stepper motor is working or ...
