An electrical actuator converting electrical energy into rotational motion.
0
votes
2answers
139 views
DC Motor control
I am using a DC 24v scrapped photocopier motor for a table fan.
To save energy, it's ON for 2 seconds and OFF for 3 seconds using MCU.
The fan keeps rotating during the power off state.
Is this a ...
2
votes
1answer
155 views
What is the mathematical relationship between MOSFET switching frequency (motor speed control) and motor speed in rpm?
What is the mathematical relationship between the switching frequency of MOSFET in a three phase motor controller (induction motor and BLDC motor) and the speed in rpm of the motor shaft?
-1
votes
2answers
333 views
Cheap linear actuator recommendations?
I've been doing a lot of research into linear actuators, and have come up pretty much empty handed in finding any small sized (lifting force 10-30 newtons) linear actuators for a doable price (30-50 ...
0
votes
2answers
132 views
DC Motor - Laptop Charger [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
I have a DC motor rated at 12 V which in its current application draws around 1.5 A. Currently I am ...
1
vote
1answer
59 views
Variable Reluctance Machines - what does the 6/4 or the 8/6 values mean?
I have been reading about electrical machines and keep getting these values in the examples but can't find what they actually mean. Is the first number the amount of stator poles and the second number ...
3
votes
1answer
316 views
How to Find Time Constant of a BLDC Motor?
I've done this with DC motors by determining the inductance and then computing tao = L/R where L is the inductance of the coil and R is the resistance of the coil.
Is there a best-practice way to ...
0
votes
2answers
197 views
How to choose a PIC for a BLDC Motor Controller?
I just made a BLDC motor controller, but I'd like it to be able to go to higher frequencies (have less dead time, faster firmware, etc). In particular, I'm aiming for 20kHz-to-50kHz range, but am ...
0
votes
0answers
140 views
slow speed electric motors [closed]
I am trying to motorize an outdoor spit. The spit is 6feet long and is used manually (crank handle) to cook whole pigs, beef quarters etc., loads of 50 to 200 pounds that I would like to cook at 2/3 ...
1
vote
2answers
128 views
How to determine if a motor is spinning
I am trying to figure out how much water is passing through a funnel, and to do so, I had the idea that I could set it up so the water will spin the shaft of a motor, which I have been led to believe ...
2
votes
1answer
246 views
Why does BLDC Motor Spin Slower with Same Duty Cycle at Higher Frequencies?
I have an OTS BLDC motor controller as well as one that I just made myself and both seem to be dramatically slower at higher frequencies. When I look at how much current is being drawn it makes ...
1
vote
2answers
266 views
how to add a motor to a potentiometer?
I have an old piece of analog gear from the 70s and I want to motorize the variable resistors on its panel. I don't want to replace the existing pots with motorized ones but rather to add a motor to ...
1
vote
1answer
147 views
High voltage H-bridge diode
i'm designing a varable-frequency drive with 2 H-bridges based on IR2108 half-bridge drivers. I want it to drive a 220v single-phase motor. Reading the datasheet i got a little confused on choosing ...
0
votes
0answers
190 views
First Arduino Project: Is this all I´m going to need to create a remote controlled toy car? [closed]
I´ve read a lot about Arduino projects, and I know nothing of engineering, but I would like to learn with a specific hobby project.
I know that you should start with small things, like turning on ...
0
votes
1answer
573 views
How to use a SN75441 h-bridge in conjunction with an arduino
I am trying to use a SN75441 h-bridge in conjunction with an arduino in order to drive a DC motor forward and backward. Let me describe the setup and then the problem I am encountering.
I have an ...
4
votes
2answers
335 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 ...
0
votes
3answers
199 views
Unable to find a source for rotary mirrors, how should I search for them?
Can someone suggest a source for rotary mirrors? I'm looking for something along the lines of the ones in the image below, but I'd be interested in any alternatives as well. (I'm building a continuous ...
2
votes
1answer
199 views
BLDC Motor Driver Losses
That was a pdf when originally uploaded, but am now going to try to zoom in on the sub-circuits. Please let me know if there's a better way to do this.
I'm trying to make a PIC-based BLDC motor ...
4
votes
6answers
285 views
Would a 100k ohm resistor or motor emit more heat
Would a 100k ohm resistor produce more heat than a motor that had the same resistance?
+|---------(100k ohms)---------|-
+|---------(100k motor)--------|-
Both circuits have the same amount of ...
1
vote
4answers
384 views
Can I reduce rpm further of a gear motor by using PWM?
I am working on a project where I need to move the object from one point to another in a dead slow speed , The object doesnt weight more than 5 pounds .
I found a DC gear motor with has a RPM of 0.5 ...
1
vote
0answers
267 views
How to drive dualsky ESC with arduino PWM? (Brushless motor)
I've recently received 4 Brushless motors, 4 brushless ESC's and 2 LiPo batteries. I managed to run the motors with my arduino and the servo library, but I'm not getting optimal results. I was ...
1
vote
3answers
201 views
Finding the right motor
I need a motor and I'm not sure what to be looking for. I know the power and torque I need (3 N*m @ 1200 rpm = 1/2 HP). Is finding a motor as simple as matching these two values?
Edit: The motor will ...
1
vote
1answer
252 views
What is a good rule of thumb for practical minimum design duty cycle for a PWM DC motor controller?
I am designing a drive that outputs an RPM of about ~350, with output torque of about ~10 mNm. I found a cheap motor that provides this torque (plus more for insurance), but the speed at rated voltage ...
1
vote
1answer
215 views
MOSFET relay connections to control a 3V motor
I need to turn a 1A, 3V motor on and off with a touch switch. I bought Omron 653-G3VM-61-AR and quickly smoked it. I had the battery + connected thru a 300 Ohm resistor to the touch switch (to get ...
5
votes
2answers
152 views
Newby building a motorised board
A bit of background:
A want to build a motorised board for my son is 3 and has very limited mobility. He can't crawl but can use his hands to press buttons so I want to build something he can lay on ...
1
vote
1answer
198 views
BLDC motor how to identify
How to identify whether given motor is permanent magnet AC ie sinusoidal back emf or permanent magnet trapezoidal back emf motor. I am confused as motor I am having seems sinusoidal back emf and ...
-3
votes
1answer
115 views
Why must the coil in a motor kit be wound in only one direction? [closed]
Wouldn't it be better to have coils going in two directions?
2
votes
2answers
248 views
Motor Soft Starter
I am demonstrating a soft-starter for a technical report, and I am having trouble finding the correct motor and power source.
I want to use SCRs in a reverse-parallel configuration to limit the ...
0
votes
3answers
615 views
Can a motor driver for 5V be used for a 24V motor?
I’m controlling a 5V motor with Arduino but need more torque which means a more powerful motor. Here is my scheme. (I took it form a tutorial):
Here Arduino is controlling a 5V unipolar stepper ...
0
votes
2answers
115 views
What type of electric motor drive can be used for keeping a load at specific heights? [closed]
We are planning to adjust the level of a load (around 50 kg) by using an electrical motor. Now we are using a hand crank and we want to get rid of this manual process.
For example we want to ...
2
votes
4answers
416 views
How to use a SN75441 h-bridge (not working as expected)
I am trying to figure out how to use an SN75441ONE h-bridge. I have it hooked up like this:
Pins 1, 8 and 16 are connected to the positive rail (+5 V). Pins 4, 5, 12 and 13 are connected to ground. ...
2
votes
2answers
416 views
Need opinions on servo motor control for heavy applications
I want to control a servo motor using Arduino and sensors. But all the example schemes or tutorials so far I found are for motors used in toys, low power applications. My task is to control a servo ...
0
votes
4answers
167 views
Can I buy a motor that vibrates or pulses very precisely?
I'm trying to make an item with a number of pads that will pulse individually or in sequence with a given signal. I have looked at vibration motors but these are like the ones in video game ...
-2
votes
2answers
209 views
What kind of electronics and motor system used for lifting a load? [closed]
I'm planning to design a simple lifting system which is driven by an electric motor. I want to lift up to 100 kg. I also want to obtain an auto-control(feed back) using some sensors for the height of ...
0
votes
1answer
88 views
power connections for electric motor
Recently, I harvested a fist-size electric motor from an old portable space-cooler (an air-conditioner on wheels). The motor has nothing written on it at all; brand nor specs. It has 5 (five) ...
0
votes
1answer
480 views
Single Phase fan induction motor current flow
I have dissemble a induction motor in a fan. It look like follows.
I have no expereince in this field. When I tried to understand it's current
flow, I got these questions.
What is the main winding ...
0
votes
2answers
333 views
Speed control of a DC motor using variac
I have a offset printing machine and it's original electrical design uses a
variac device to control it's speed (RPM) value of the main motor drive.
I don't have access to any electrical wiring ...
1
vote
3answers
219 views
Does anyone build 100k RPM alternators?
What I'm contemplating is the practicality of building a direct drive turbine-alternator (or generator) system out of an engine something like this.
Based on some reasonable guesses, that would take ...
1
vote
1answer
1k views
What is the difference between 1-phase and 3-phase motors?
I've read the wiki page on AC motors, but it's still unclear to me as to how they work. I'm looking at motors for a project and need them to be able to have their speed controlled by a light dimmer ...
0
votes
1answer
127 views
How can i tell what the voltage,watts and Brake Horse Power is on my mobility scooter motor is as it does not have any info stickers on it at all? [closed]
Can someone please tell me how I can tell how much Voltage,Wattage and brake horse power my mobility scooter motor has? How can I test this?And what with? It is a 4 Mph scooter and uses 2 12V 33Ah ...
3
votes
1answer
367 views
Half-H bridge or low-side MOSFET for PWM motor control
I'm driving a DC motor (12 V, approx. 4 A) and I need to control the speed by PWM but I need one direction only and braking is not required.
My question is: is there any advantage to using a half-H ...
0
votes
1answer
148 views
What is this equipment called?
In this video at 0:40, what is the equipment he is using to power the motor? It seems to be some sort of torque leveraged device (forgive my ignorance).
...
0
votes
1answer
289 views
What's the best method for generating 5V at 2A?
I'm trying to make a crank DC charger. I understand the voltage regulation circuitry and (if needed) the bridge rectifier circuitry, but I'm still a total noob. I'm wondering what is the ...
0
votes
0answers
48 views
Parts List to Replace Battery Packs?
I've purchased and installed some relatively cheap motorized blinds for my apartment. After having them for about a month, the batteries are dead on 2 out of 3 sets. Each blind has a pack of 7 AA ...
1
vote
1answer
107 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
votes
3answers
690 views
Small Powerful Brushless Motors
Boostedboards.com says they use twin brushless motors, total 2000W
Anybody know what they are? where I could get a couple? Guesses or pointers welcome, I'm not really familiar with small electric ...
-2
votes
2answers
163 views
Radio Control Electronic Schematic
My friend, who is interested in jet engines and welding is getting is working on a jet car, or something along that lines. I am just working on the electronics because I like the circuit building and ...
5
votes
3answers
970 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 ...
4
votes
1answer
207 views
How to drive stepper motor at maximum speed with a higher voltage power supply in hand?
I had a question about "Wantai" Stepper Motor with an Arduino hooked up to an motor-shield.
Looking at the spec sheets the max volts and current allowed in that particular stepper motor is 3V and 2A. ...
2
votes
2answers
407 views
DIY small motor that turns for x seconds every y seconds
I'm a civil engineer, hiker, and hobby photographer. I am trying to build a little device that gently turns a small motor on every x seconds, keep it on for y seconds, and stop it for z seconds. For ...
1
vote
1answer
232 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, ...
