A common actuator in robotics; it's usually made of a static magnet (stator) and a set of moving inductors, acting as electromagnets, connected to the circuit through brushes. Brushless motors use phased clocks with electronic circuitry to generate motion.

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1answer
23 views

Power supply turning off when a motor is stopped then quickly turned back on?

When I stop my 12V wiper motor, then turn it back on within a second or so, my 12V 5A cheap power supply turns off for less than a second, and comes back on, then turning on the motor. What causes ...
0
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0answers
15 views

Does a motor's stall current change with applied voltage?

In other words, if the load is great enough, will a 110V, 18A rated motor being run at 5V stall at the same current as if it were run at 110V? I'm asking because I'm currently working with a ...
-2
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0answers
23 views

Electric motor drive systems

I am looking for a way to learn about electric motor drives. It would be ideal if I could come across something similar to an online course with a purchasable motor-drive kit for performing hands-on ...
0
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1answer
41 views

High-current motor on isolated circuit causing servos to move

I have a robot with several servos controlled by an arduino. Also attached is an electric airsoft gun, which draws considerable current. The gun is on an independent circuit with a separate battery ...
0
votes
1answer
61 views

DC motor - Transistor / Mosfet - Design

The one on the left seems to work neatly. But the right ones' motor goes way slower. Though, I did find the right one on the internet (and internet is always true). My thoughts: The amount of ...
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1answer
41 views

Is the excess of current the only problem in a motor overvoltage?

I'm designing a Full Bridge for a Brushed DC motor control. My circuit will have a current measurement, so I'll can control the output current, sinked by the motor. Whit this current control, I think ...
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votes
2answers
51 views

RPM of two 300rpm motors is not equal, what to do?

I have two 300 RPM motors. But one moves slightly slower. Hence the robot does not move exactly straight. I tested various PWM values and now I am getting very less angle of turn. i there any other ...
-2
votes
0answers
31 views

How to get angle of movement and feedback in dc motor?

I am working on a project. I that project i need to turn the robot 90 degree exact left and right. Also i need feedback from the robot to monitor its actual position.I studied about encoders but ...
0
votes
1answer
46 views

DC motor as a generator as a torque limiter?

Is it possible to use a DC motor as a generator to regulate applied mechanical torque? A hypothetical situation: I have a DC motor acting as a generator attached to the ceiling. The motor shaft has ...
0
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0answers
32 views

Maximum Power Output For DC Motor

For now I don't have a graph on which my question is based. I will add it as soon as I get it. The graph between power output or mechanical power developed and the armature current for a dc motor is ...
0
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0answers
26 views

Back emf representation in the circuit diagram

Here is a figure on which my question is based. Back emf opposes the applied voltage,say E in this case. But how can I interpret from the figure that it opposes E? I would also like to clarify one ...
3
votes
2answers
387 views

Difference between torque and speed in dc motor?

I have knowledge about the definitions about both speed as well as of the torque. But I am unable to think dc motors in terms of speed and torque. When the armature of a dc motor rotates , we call it ...
0
votes
3answers
102 views

Anything Wrong with my Light box Design?

I am creating a custom box that will contain 3 * 400 watt metal halide bulbs (1200 watt total). The box will remain closed for 60 minutes, open for the next 60 minutes, then closed, then open and so ...
0
votes
0answers
57 views

Torque and Speed Of a DC motor

In dc motor, speed is directly proportional to back emf and inversely proportional to flux. And torque is directly proportional to the product of the flux and armature current. So according to this, ...
2
votes
3answers
200 views

Back Emf of dc motor

I couldn't find the explanation for this query of mine. Why back emf in dc motor is nearly equal to the applied voltage on no-load? I tried to search on the internet but all in vain.
2
votes
1answer
174 views

why motor continues to rotate in same direction even after changing the polarity of both armature as well as field winding?

In order to change the direction of rotation of dc motor either the armature windings connection should be change or the field winding connections but not both. I don't get how the motor keeps on ...
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0answers
33 views

Electrical dc motors

I understand that is emf induced in an open circuit and when the circuit is closed , it give rise to current?Then, Why is the back emf in dc motor does not give rise to its own current? Like it ...
0
votes
1answer
42 views

why ac current flows in dc motor?

I know that commutator is used in dc motors to convert dc to ac and vice-versa. But I don't understand why we need to convert the dc into ac in armature conductors of a dc motor?
0
votes
1answer
28 views

interfacing spartan 3 fpga with arduino motor shield

I am doing a project on spartan 3 xc3s200 series. I have already programmed it to run a counter. I want to run a dc motor using the same fpga. And I have a motor driver -Ardiuno motor shield(L298P) ...
0
votes
1answer
40 views

arduino DC motor direction change

Hey Guys i have been following this tutorial on dc motor direction control the only change i have made is using this relay Relay Link instead of one mentioned in the tutorial. How do I proceed ...
0
votes
1answer
46 views

Which battery should I use to power arduino+motor shield + two motors

I am using two motors ( from old two drill machines - same kind, these are 3.6v motors ), connected to arduino + arduino motor shield seeed studio v2. I tried to use 18v/1.2a battery that was laying ...
0
votes
1answer
32 views

H Bridge Voltage Drop w/ Motor Installed

first post after searching the net/ site for quite some time. I have this H-Bridge circuit http://www.circuitstoday.com/h-bridge-motor-driver-circuit I'm using 3 AA batteries to test this BEFORE ...
0
votes
0answers
12 views

Individual Control of 4 DC Motors with 1 Motor Driver

I am trying to control 4 DC Motors with a position feedback signal, with access to only one of manufacturer's motor control driver boards. Since I don't need simultaneous control over all of them, I ...
0
votes
0answers
44 views

What is the reactive force on an electric motor?

I'm trying to apply Newton's third law to electric motors. If an armature is rotating at high torque, to move/rotate an object, what is the equal and opposite force being applied to the motor? Is it ...
0
votes
1answer
63 views

Make a brushed DC motor move “free”

I want to place a DC motor on the driveshaft of a marine steam engine. Since i do not want to loose or add power to the drive but only having the motor there for backup reasons, i want to let the DC ...
0
votes
0answers
73 views

12v dc motor transfer function

I am working on a dc motor speed control project in proteus. And currently i am doing the tuning of PID controller and for tuning i am trying to figure out the transfer function of dc motor. Now what ...
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1answer
39 views

AVR's and DC Motors\Servos

I've been browsing around looking for some information on motors\servos and AVR's (my MCU of choice). Motors\servos are in my gray area, meaning I'm still not too into them, but I could do something ...
0
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0answers
64 views

DC Iris control circuit

Does anyone understand how a control circuit for the DC Iris found in video camera lenses works? From my research I see that it is a four pin interface two pins for drive, and two for "damping". I ...
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votes
1answer
67 views

DC motor working on Arduino but not Attiny with batteries [duplicate]

I have a simple working circuit to control a DC motor with an Arduino as indicated in the Arduino examples. For instance, ...
0
votes
1answer
124 views

Optical encoder in Proteus

I am working on dc motor speed control project in proteus and for the feedback i am using optical encoder.Dc motor speed is calculated by counting pulses from encoder. But i wanted to know what is ...
-1
votes
1answer
57 views

Functions in Mikroc [closed]

Below is my code it gives error as "all functions and variables not defined" Please help I wrote a program for speed control of dc motor for pic18f8722 In Mikroc Please help ...
5
votes
5answers
428 views

Can someone check over my schematic?

This is the first schematic I have made that was not a simple LED. I want to know if it seems good before I go and build it (and buy the parts). Here is the schematic: Here are a few of my ...
1
vote
1answer
110 views

Beaglebone black gets shutdown signal when I move rc motors

I have a beaglebone black that I tucked inside an rc truck. I removed the radio control chip. Everywhere it had 3.9 volt logic I put in a 3.3v gpio control from the beaglebone. It works great I'm ...
1
vote
2answers
108 views

Reduction of DC motor noise

I am designing a circuit with a DC motor (http://www.jaycar.com.au/products_uploaded/YG2732.pdf) and some other stuff including a MCU and a LASER, all driven from a single 12V source and am concerned ...
0
votes
1answer
47 views

Motor powered on and brakes disengaged for three days, should I be worried?

I have a brushless DC motor which runs at 24v which I left on for three days without noticing. The motor just has a ssi motor feedback. The motor was not running as the software which commanded it was ...
0
votes
1answer
69 views

Is there any way I can power my 120-220V AC motor from a battery

I am building a new robot, it's a little bit heavy, so it's hard to find a motor that can push it. I am thinking of a way to use machines at home (I have two options: Automatic hair drying machine and ...
1
vote
1answer
66 views

How do current spikes effect component lifetime?

My Master's thesis project works with a system that mechanically prevents a DC motor from stalling and effectively thresholds the amount of current the motor draws and removes large current spikes ...
1
vote
2answers
60 views

How can I find out the actual rpms my dc motor at any given moment?

In my next project it will be very helpful to monitor the speed of my dc motor. How can I accomplish this?
0
votes
4answers
81 views

Stopping a DC motor using an H-bridge: forward+backward vs. 'brake'

Using an H-bridge, you can stop the DC motor at a certain position by applying a 0101 or 1010 signal to the 4 terminals. You can also stop it at a certain position by driving it forward then ...
0
votes
2answers
128 views

Mosfet type to drive a 100A DC motor using pwm

I have a bunch of custom made DC motors. They are supposed to work in a range between 80Vdc and 120Vdc. Nominal power is around 800-1000W (they're custom made for a custom application, so specs are ...
0
votes
2answers
106 views

How do I determine terminal characteristics of a dc motor with known torque and angular velocity?

How do I determine the terminal voltages and currents that will be produced by turning a dc motor at a known angular velocity and a known torque? I know that for a dc motor, the load torque has a ...
0
votes
1answer
43 views

DC Motor inertia voltage drop

following a tutorial on the web I created in LTSpice a DC motor model, but I have a question about the results, the model is: and this is the spice netlist: ...
1
vote
3answers
155 views

How to compute the effective voltage across a DC motor driven by a pulse train?

I'm driving a DC motor with a pulse train and effectively reducing the battery voltage to control the speed by adjusting the duty cycle. Pretty standard. What I'm unclear on is whether to use V_rms ...
0
votes
1answer
72 views

How do I supply power to two 18v 2.4 amp motors?

I have two of these motors: http://www.radioshack.com/radioshack-super-speed-9-18vdc-hobby-motor/2730256.html#q=motor&start=6&tab=tab1 According to Radioshack's specs (which may be off, not ...
0
votes
2answers
160 views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
0
votes
0answers
29 views

Low power, low duty cycle, full speed dc motor timer

I need to drive a 12v dc motor drawing 300ma under load. It only needs to run about 4-5 seconds per min. But the run and idle times need to be adjustable with some degree of accuracy. Once ...
0
votes
1answer
75 views

Behaviour of DC series motors

I'm having trouble implementing a DC series motor simulation, and I think this is due to the fact that I do not understand the motor behaviour itself. Notice that the mechanical part of the ...
1
vote
2answers
99 views

Is it possible to figure out the specifications of an electronics piece without datasheet?

I'm brand new on the "electrical engineering" scene with my Arduino and I have a question about random electronics. I've been taking apart some old phones, salvaging LEDs, motors and speakers, mostly ...
0
votes
2answers
91 views

Automatic 12V plant watering system?

I'm planning to make a plant watering system . There is a beeper so it will alert us when the soil is dry.I have got a 12V DC motor . So i'll be removing this beeper and i need to add this DC ...
0
votes
1answer
71 views

Can a gear motor w encoder be 60 ft away from controller?

This is my first time posting so please forgive any ignorance that may come across. I'm considering hooking up two gear motors (Devantech 24V, 49:1 Gear Motor w/ Encoder) to a motor drive (MD49 - ...