An electrical actuator converting electrical energy into rotational motion.
1
vote
1answer
28 views
PWM vs. PPL in L298 motor controller
I am currently developing a small robot project. The motor driver I have uses a L298 motor driver IC. It supports two methods of control, PWM and PLL and it is configurable with on-board jumpers on my ...
0
votes
0answers
26 views
Why my AC motor is making an increasing noise?
I have a centrifugal blower, which probably use a permanent-split capacitor motor(it has 3 wires, and 1 10uF capacitor). After I turn on the motor, first it runs stably for a while, then its humming ...
0
votes
2answers
58 views
Precision with a continous servo motor
Ok, here's my problem:
I need to create a needle that can rotate continously in both directions and an infinite amount of "loops". I guess the ideal is to use a servomotor, isn't it? I couls use ...
-5
votes
0answers
52 views
Setting the rotation of stepper motor to only 120 degree [closed]
I am using sonceboz stepper motor with mc9s08lg32 MCU and not able to rotate it to only 120 degree, it is rotating at 270 degree but not 120.
2
votes
1answer
104 views
What are the major advantages of using a closed-loop over an open-loop and vice versa?
I'm trying to gain a better understanding on the pros and cons using closed-loop or open-loop motor control. Also trying to better learn when it's more sensible to apply each one
6
votes
1answer
96 views
What are the things to notice before actually connecting a PWM motor circuit?
I have simulated a PWM motor control circuit in Proteus, now I want to bring it to life and connect a circuit in real world.
Here's my PWM circuit in Proteus:
And the code:
...
2
votes
2answers
47 views
How to trade off connection styes in mixed gnd systems( power gnd and signal gnd)?
I am using a motor driver L6235 from ST:application note.On page 6, it gives me a layout suggestion:
it says that the SIGNAL GND and POWER GND should be connected in a single point: the negative ...
3
votes
3answers
104 views
Does the frequency of a PWM signal have to be constant for a DC motor/fan speed control?
All PWM control systems I have seen for DC motor/fan speed control used a constant frequency. Is this really necessary in all cases?
How would the motor current have to be calculated for a PWM ...
-2
votes
0answers
45 views
Car Radiator Fan may have a Fault, I'm an electrical noob [migrated]
I took the fan out from my engine compartment and am now ready to test it. It consists of two fans, one larger than the other connected I believe in series with two large wires, one red, one brown ...
-2
votes
2answers
53 views
Connect micro gearmotor to 5V battery
Would 3 motors (like this one http://www.pololu.com/catalog/product/993) connected to a 5V battery (like this one http://www.dx.com/p/59438) work?
0
votes
1answer
52 views
Running 7V motors with 2x 3.7v batteries
We're really enthusiastic to build a homemade quad-copter with almost no knowledge about such things. We will probably use Arduino and Bluetooth to control it, but we have a question about the motor ...
2
votes
2answers
135 views
Making an obstruction avoiding device without microcontroller
I want to make a toy device which spins to the left whenever there is an obstruction in front of it, without any microcontroller. Can anybody please check whether my approach in building the device is ...
2
votes
3answers
97 views
DC Motor Efficiency at Fixed Torque
I am in a muddle here, so thanks for making the effort to have a read.
I understand that electrical power going into motor is given by:
\$P_e=I^2R\$
I understand that mechanical power out is given ...
1
vote
2answers
94 views
How to reverse rotation direction of stepper motor
Is it possible to reverse a stepper motor's direction of rotation by changing the polarities of its wires?
I'm asking because I have two stepper motors connected to one single driver and mounted on ...
0
votes
1answer
90 views
Arduino Motor Shield R3 Current sensing
I am trying to use current sensing functionality of Arduino Motor Shield R3, the shield is based on L289.
The values that I read seem to be very noisy. I am using Arduino UNO A0 analogRead() function ...
-3
votes
0answers
51 views
hendershot power supply [closed]
Just wondering whether I should buy the blue prints for the hendershot generator it has just come up on my computer @ $27 dollars, I do like things which have something to do with magnetism. But cant ...
0
votes
0answers
50 views
How to correctly use a few 28BYJ-48 with ULN2003A and one Arduino Mega?
I bought 28BYJ-48 5 Volt stepper motor with ULN2003A Darlington Array driver. I run basic Arduino examples and some code from web. But how do I use a few motors with one Arduino? It has very small ...
-1
votes
3answers
135 views
Controlling Microcontroller using Visual C# [closed]
I'm building an ROV which I will program normally with C but I want to control the microcontroller from a PC using a program written in C#. So for the ROV, the microcontroller will be controlling it ...
0
votes
1answer
58 views
How to Control SM1 Inverter Drive Frequency with Arduino?
I am back at trying to control the frequency of an SM1 AC inverter drive due to the fact that I never got it going the first time. However, this time I would like to use an Arduino. The manual for the ...
2
votes
3answers
86 views
Substitute a MOSFET in a motor controller
I'm trying to build a CoffeeBot from MAKE magazine, and I had a question about one of the components. The circuit is pretty simple; it uses an Arduino to control a gear motor via a MOSFET transistor. ...
4
votes
4answers
79 views
What are the factors that significantly affect the life span of a DC motor?
I'm currently planning to run a DC motor continuously on solar power. So I would like to know which things I should be very careful about for optimum lifespan of the motor. I found the following two, ...
0
votes
0answers
58 views
Choosing the correct brake resistor for DC motor
I have a DC motor running on 24VDC rated 150W (~6,25A), how do I calculate the correct brake resistance?
2
votes
1answer
62 views
What type of stepper motor should I use in my project and how do I control them?
I'm building a video camera pan and tilt head. Here's what I'm getting at:
I'll need one motor to control the horizontal rotation of the camera, and one for the vertical. The horizontal motor ...
1
vote
0answers
52 views
SEM Permanent Magnet DC Motor DPM 30R4 1500RPM 24VDC Output: 0-25kW & Brake
I am in the plannning stages of a project to build a pig rotiessiere. I have the above mentioned motor, but I am unsure of what type of power source is needed to run the motor and what can I do to ...
2
votes
1answer
90 views
Control old printer motor with position ring
I purchased two old printers at a garage sale today in hopes of dismantling them and playing around with some stepper motors. After tearing both of them apart I discovered that there are no stepper ...
2
votes
3answers
79 views
Slowly turn a planisphere at the sidereal rate
My problem is to rotate a planisphere (a star chart) at the sidereal rate.
I will set the planisphere to its initial position manually, then turn on some device which rotates the planisphere on its ...
1
vote
1answer
129 views
Speed control for high power DC brushed motor
I am going to drive and bi-directionally control the speed of some 12V/24V, 100W to 300W DC brushed motors.
I have some experience in controlling small DC motors (6V/9V/12V, 0.5A to 2A) with PWM ...
1
vote
2answers
97 views
simple h-bridge polarity reversal
I am trying to reverse the polarity on a rather beefy motor (5 amp, 60v) in the most simple way possible.
I need to build an h-bridge just to reverse the current, I am controlling speed elsewhere. ...
2
votes
1answer
111 views
How to connect a pulled motor from a printer to Breadboard and control with raspberry pi? [closed]
I managed to salvage a couple of motors from a worn down old printer, and I'm unsure of how to get about connecting it to a breadboard and then to a Raspberry Pi. I've got a cobbler kit for my Pi that ...
0
votes
2answers
98 views
Battery powering an unknown DC motor
I know nothing about motors. I have DC motor (sealed in a casing) that uses 6v/12v 1a (mains switching power supply) with 2.1x5.5mm DC connector. It has variable speed controller, reversible ...
1
vote
0answers
144 views
L298N shield gives relatively low ouput voltage and current
I am using a L298N shield together with an Arduino to drive a 42mm 2 phases bipolar stepper motor. The driving voltage for the motor is 12V and the logic voltage for Arduino and the L298N shield is ...
0
votes
1answer
52 views
Motor Driver, increase output voltage
I have a sabertooth motor controller and it is rated max 33v input. I need (at max) almost double that on the output. Can I hook up one of these to the output port, between the sabertooth and the ...
1
vote
0answers
33 views
Why do my outputs look exactly the same for the Allegro 3901?
I am trying to capture results shown in Figure 8 of Allegro 3901 data sheet .
My circuit looks like this:
The channels above coresspond to the oscilloscope screen captures below:
In the image ...
-2
votes
1answer
68 views
Should all SATA HDDs spin up without SATA cable? [closed]
I've got a Western Digital WD3200AAJS HDD and am trying to spin it up (I don't really need it as an HDD, I need just its motor to work).
After connecting the power cord it didn't spin up, so I am in ...
3
votes
1answer
104 views
What is the function of a capacitor in a motor circuit?
I read a manual of how to connect a speed controller to a motor. I see there is a capacitor as shown below. My question is what the function of the capacitor is? Thanks
5
votes
3answers
233 views
op-amp vs direct control
I'm experimenting with small motors (just building useless toys so far) and I'm wondering what benefit there would be to using an op-amp to control a motor (top circuit) vs just controlling the motor ...
0
votes
1answer
74 views
Interactive Art with Wooden Mirrors - How are the pixels controlled?
http://www.youtube.com/watch?v=BZysu9QcceM
This video shows a mirror made up of moving wooden pieces. Please have a look. He achieves different intensity levels by motion of the wooden pieces and ...
1
vote
2answers
90 views
Correct AMPS & volts for DC motor controller
I'm definitely an amateur hobbyist, but I need to fix something for a friend.
I have a existing DC motor and the controller is shot. The motor is rated at 0-90 VDC (5Amps)
I wanted to see if this ...
1
vote
1answer
45 views
PWM npn sinking signal
I have a stepper motor(with STR2 Step Motor Drive) which needs npn sinking signal to operate. dsPIC33EP512mu810 is capable of generating high resolution pwm. However, the PWM signal can only turn on a ...
4
votes
1answer
175 views
Reversing direction of a 115v ac motor using Arduino
I have a 115V brushed motor that I am controlling via Arduino. The manufacturer says it draws 1A but I'm not sure if that accounts for the initial current draw to turn it on. I've had great ease and ...
2
votes
1answer
64 views
L293D Brake Doesn't Work (LB1836M good alternative)?
I have a microcontroller that is supposed to drive three motors (only one needs to be driven at the time). I tried doing this with two L293D's but there's a problem with braking.
The problem is that ...
0
votes
2answers
85 views
Motor not working via transistor
I have a very simple circuit as follows
simulate this circuit – Schematic created using CircuitLab
when the motor is connected in this fashion, the netduino activates the transistor, but ...
1
vote
1answer
85 views
Using capacitor to maintain current flow past opening of switch
This circuit turns on the motor when something blocks the beam from the LED to the phototransistor. I want the motor to remain on for 5 seconds after the beam stops being blocked (i.e. from when the ...
5
votes
5answers
364 views
Microcontrollers - Beginner questions
How do you determine how many sensors a microcontroller can use?
My understanding is you can't use C# directly on any microcontroller but you can use C# and communicate over the USB and look for a ...
1
vote
1answer
45 views
small fixable position motor to drive universal stage, possible?
I'm trying to make a universal stage, inside a cooling chamber, controlled through Arduino. So what I'm after are small as possible motors (2-3 cm with shaft) to fix on the stage's arms which will ...
2
votes
0answers
64 views
Matching mosfets - linear servo amplifier (AB)
I'm replacing a bunch of burnt mosfets in a linear amplifier for a brushless motor.
3 phases
Each phase: 3 pairs of totem IRFP240 / IRFP9240 in parallell. (no R in series)
My main concern is ...
1
vote
4answers
192 views
Can I use a 220v engine to build up a RC car?
sorry for the noob question, but I'd like to build myself a small RC car. I've found this motor in a blender, which runs at 220v.
Can I power it with a lower voltage? What should I use?
Thanks a ...
2
votes
3answers
224 views
AC motor Low RPM problem
I'm working on a controller for ac induction motor and it's spec is given below. I could control the speed without any trouble at higher speeds like 2000 rpm and above. I'm using TRIAC phase angle ...
1
vote
1answer
56 views
Detecting Motor Overload
I want to make a circuit to indicate an LED if a motor is drawing too much current. (when the motor is stopped for example mud got stuck around the gears) I am using 9-12 volts to power my motor, and ...
1
vote
1answer
71 views
Electrically Controlling A motor direction
I want to control a motor's direction electrically. When the input is a zero, I want it to go one way, and a 1, the other way. The only way I can think of this is a solenoid with a spring attached to ...
