Questions tagged [motor]

An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). There are many types of electric motors. If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.

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3
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4answers
22k views

How to decrease the motor Speed without losing the maximum Torque

I am using MDS40A motor driver(http://www.cytron.com.my/viewProduct.php?pcode=MDS40A&name=SmartDrive40) to drive a power window motor (12V, brushed motor) similar to the one at (http://www.cytron....
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2answers
3k 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 ...
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2answers
206 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 ...
3
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1answer
8k 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
5
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1answer
569 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
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2answers
823 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 part ...
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3answers
4k 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 ...
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2answers
88 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?
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3answers
895 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
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2answers
761 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 ...
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3answers
4k 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 ...
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4answers
71k 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 ...
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1answer
4k 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 ...
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3answers
2k 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 ...
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1answer
1k 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 ...
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3answers
4k 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. ...
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4answers
5k 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, ...
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1answer
1k 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 shouldn'...
2
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1answer
1k 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 ...
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4answers
454 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 ...
2
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1answer
2k 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 ...
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2answers
2k 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
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1answer
1k 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 ...
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2answers
2k 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 direction,...
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0answers
1k 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 5V....
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1answer
815 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 ...
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0answers
72 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 ...
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1answer
2k 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 ...
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1answer
2k 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
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3answers
3k 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 ...
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1answer
452 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 ...
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2answers
1k 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 ...
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1answer
235 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
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1answer
3k 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
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1answer
1k 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 ...
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2answers
178 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 ...
3
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1answer
517 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 ...
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5answers
655 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 ...
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1answer
101 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 ...
3
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1answer
523 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 ...
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4answers
2k 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
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3answers
6k 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 ...
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1answer
683 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 ...
2
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1answer
244 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 ...
0
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1answer
599 views

What are fast and slow decay timings in the Allegro A3201 low voltage meter?

In the A3901 Low Voltage Meter Driver datasheet Figure 8 on pg. 10 shown below indicates what the output "IOUT 2/3-4" will look like given input "IN1/3 or IN2/4". But Figure 8 does not mention ...
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1answer
650 views

Driving a brushless DC motor (with a UC3625?)

I am trying to drive a brushless DC motor with hall effect sensors using a microcontroller and a TI UC3625 controller. Thing is, I haven't had much luck. Its a beast of a chip and I've tried wiring ...
2
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1answer
378 views

Which electro motor to use for steering a kite? (guestimation marathon)

I'm doing a pet project in which I want to fly a kite from my computer. For this to happen my plan is to build a little box hanging under the kite which includes a raspberry pi (connected to my laptop ...
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2answers
287 views

Why is this electro motor going slower?

From an old dust buster I've got this electro motor, the included battery pack and the charger: I ripped everything apart (the dust buster was broken) and the motor still works. After playing around ...
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5answers
8k views

how to automatically reverse the direction of a stopped gear motor and restart 12 hours later

The reversible gear motor needs to turn on @ 6:00 am pull a object 12 inches and shut off. Twelve hours later the gear motor needs to turn on and reverse the direction and place the object back in ...
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1answer
2k views

Soft-Starter PWM Noise

I have developed a soft-starter for a project of mine. I am using an Arduino Uno to generate PWM to an OAC-5 relay that turns on and off the voltage across my bridge rectifier. Here is a simple ...