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.

Filter by
Sorted by
Tagged with
3
votes
2answers
6k views

Arduino - Controlling multiple 12v motors

I have seen this thread but it wasn't helpful. Is it possible to connect four 12v/4a motors to one Arduino and control them independently? I'm a beginner to circuits and such - that's the part that's ...
1
vote
1answer
2k views

What electric motor spec clues indicate easy speed control options?

I'm investigating HVAC fans etc to design my own system and controls, and having fully variable speed control is an important consideration to me. I'm pretty sure there are types of AC motors that ...
0
votes
3answers
20k 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 not....
7
votes
2answers
14k views

How to find out whether I have a unipolar or a bipolar stepper motor?

I have one stepper motor. There are six wires coming out of that. How can I find out weather I have a bipolar or a unipolar stepper motor? Note: Related, but not a duplicate: Unipolar and Bipolar ...
-6
votes
4answers
10k views

stepper motor controller

I wish to know how to build a simple stepper motor controller which can run a bipolar stepper motor in forward and reverse direction in desired speed? My project requires only 5 RPM so high speed is ...
6
votes
3answers
4k views

What would be the difference in a coil of wire and just a cylinder of solid copper?

Ok so I am learning about induction and I always see coils of wire with no insulator. So I was wondering, What is the significance of it being a coil of wire rather than just a solid cylinder since ...
0
votes
1answer
228 views

Debugging Vds exceeded in motor drive application

I have an existing motor drive circuit that uses an Allegro 4935 to drive a brushless DC motor. The circuit has been working fine. We've decided to change motors, now with some of the motors the ...
2
votes
1answer
5k views

how choose transistor for driver circuit of stepper motor?

I need to drive a 1A stepper motor coil from a digital output that can source only 5mA. That would require Hfe of 1A / 5mA = 200, but I can't find a transistor with that much gain. Is there any ...
1
vote
1answer
5k views

stepper motor digital frequency and speed?

In what way the frequency of digital pulse affect the stepper motor funtion. I want know this because i can send digital pulse through my data acquisition card at rate of 100Hz. I want to run bipolar ...
4
votes
2answers
2k views

how to construct stepper motor driver?

I am going to do one project in labview my requirement is to control the stepper motor in following way while pressing one button in front panel the stepper motor should run in one direction in ...
7
votes
4answers
7k views

Brushless motor specs to maximize stall torque

I'm interested in a brushless motor having a high stall torque (not much in RPM). What specifications of a BL motor would give a fair indication of its stall torque, provided that voltage is fixed ( ...
1
vote
1answer
1k views

Is this a reasonable circuit for locked antiphase PWM?

I'm building a motor controller for a robot that will have a very limited number of IO pins available. I need to drive two motors from only 3 pins, and Locked Antiphase PWM, where the motor is ...
1
vote
2answers
376 views

How and where is energy dissipated in a driven traction motor?

When a fully loaded elevator is moving down its potential energy is decreased and I guess is somehow converted by the elevator traction motor into heat. How exactly does it happen? What exact ...
5
votes
2answers
4k views

why electric motor or alternator have stack of plates?

i have noticed that all of the transformer/motor/alternator/electric actuator have a stack of metal for stator ( or where winding is done. ). why is that needed ? can same thing not achieve by using a ...
0
votes
2answers
444 views

Brushless Motor Encoder Read?

I have this a MegaMo SY3056 BLDC Spec.PDF And beside the cables that are connected to the ESC i have thses encoder cables: How can i read this encoder? and what values do i get? Can i know the ...
1
vote
1answer
168 views

Circuitry for Running Many Small Motors

I'm creating a simple vibration mat for a child which will be triggered by a force sensor. I'm not trying to do anything complex (like changing frequency of vibration) - simply an on/off circuit. What ...
5
votes
4answers
2k views

basic arduino question - do I need a 555 timer?

I have an Arduino (duemilanove) connected to a floppy disk drive and I can happily control the stepper motor using three pins on the ribbon cable to three digital pins of my Arduino (well 2 + the ...
9
votes
3answers
2k views

shooting object by using a DC motor

This is not directly electrical, but I am working on making a real life version of a coin block from Mario. Basically I use an LDR and to detect if someone punches the block and then use a transistor ...
4
votes
1answer
15k views

What power motor should be used to power a Segway-like device

I am planning on building a personal transportation device which will either be a skateboard with a motor etc or a Segway-like device. I will have two wheels and must be capable of getting me to move ...
3
votes
3answers
3k views

Backdriven stepper motor “powering” rest of the board

I have a stepper motor powered by a breakout board that uses the A4983 stepper motor driver (http://www.sparkfun.com/products/10735). Sometimes when the power is disconnected and the drive wheels are ...
0
votes
1answer
1k views

how do i drive the h bridge to control a motor?

I am using the ZXMHC3F381N8 MOSFET H-Bridge to drive a motor forwards and backwards. I am using a PIC16F1946. The H bridge is connected to PORTE of the PIC. This is the code I am using to set up the ...
9
votes
2answers
122k views

What is the purpose of carbon brushes in an electric motor

I just took apart our washing machine to replace the carbon brushes. Was wondering why the machine stopped working when the brushes were worn down? Also if the engine makes a wuring noise after you ...
16
votes
2answers
10k views

Why connect capacitors to motor body?

So I've found a motor circuit which looks like this: Since many users here believe that my hand-drawn circuit schematics are in fact pictures of flying spaghetti monster, I'll also provide a written ...
8
votes
4answers
17k views

When should I fire the TRIAC's gate when controlling an inductive load (AC motor)?

I'm using a combination of opto-triac + TRIAC to control a 230V AC motor with a microcontroller. For detecting the zero-crossing of the voltage I'm using another optocoupler. I know that the AC motor ...
4
votes
2answers
5k 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 ...
0
votes
3answers
4k views

Control hacked servo motor speed using L293D and PWM

I've got a L293D and a PIC16F877A outputting PWM. Not real PWM, just using Timer0 to turn ON a pin for 2 ms and OFF for 18 ms (total of 20 ms period). W.R.T. to the above schematic I got ...
7
votes
6answers
35k views

What is back-emf: counter-electromotive force?

Could someone knowledgeable on the subject explain what exactly is this back emf? How is it caused in a motor/generator, which components and which effects determines it?
1
vote
1answer
940 views

Is this galvanic isolation?

I'm doing a project which consists of 2 big parts: a control part (a microcontroller with I/O pins expanded, USART-to-USB, a RTC, an EEPROM, a LCD) working @ 5V and an actuators part (optocouplers for ...
1
vote
2answers
914 views

Galvanic separation between a microcontroller and a motor driver

Is it possible to achieve galvanic separation between a microcontroller and this driver . It's a dual full bridge driver and I'm going to parallel it's outputs (consequently the inputs and the sense ...
1
vote
1answer
2k views

how to control brushless dc servo motor?

I have one of this motor and would like to make a controller for it ( just a speed controller with regulator that change speed from zero to maximum. ). I know micro controller and embedded system, but ...
4
votes
2answers
7k views

Cannibalizing a printer, how to figure out what some of the parts are/do

My son an I are attempting to cannibalize a printer a HP LaserJet 1300. It used to work and print, but it was low on toner and the company we got it from replaced it instead of buying new toner. So, ...
6
votes
5answers
79k views

get a DC motor from household device?

I was wondering if there are any common household devices from which I can get a small DC motor (I have a 9V battery...) to use with a breadboard? It'd take me a long time to buy one so I was hoping ...
9
votes
1answer
567 views

Need help understanding and interpreting IGBT datasheets

When it comes to motor control, I understand that we have the option of using discrete MOSFETs or IGBTs. Also, there are some products in the market where 6 IGBTs are placed in one single package, ...
5
votes
2answers
9k views

Which voltage uses the “Kv” parameter in a BLDC (Brushless DC) motor?

According to the definition of a BLDC by Wikipedia: \$K_V\$ is the motor velocity constant, measured in RPM per Volt (not to be confused with "kV," the abbreviation for "kilovolt")[6]. The \$K_V\$...
13
votes
4answers
10k 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.
6
votes
3answers
5k views

How do I know where I need decoupling capacitors?

I'm building a motor driver shield for the Arduino. Here's the schematics (please forgive the messy layout): And here's the PCB layout: I'm testing it out by breadboarding it while running a simple '...
23
votes
3answers
71k 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.
0
votes
1answer
238 views

Suitable motor for pic WAKING project

Since my sleeping is very deeply, I can't wake up with alarm clock, I thought for a simple PIC-microcontroller project to wake me up. I will suspend a "bucket" full of water from the ceiling above my ...
4
votes
1answer
443 views

Maximum switching speed of a motor

If I have a MOSFET (or a number of paralleled MOSFETs) driving a motor, what determines the maximum bandwidth (PWM frequency) at which I can excite a motor phase? Is this only a function of the total ...
2
votes
2answers
269 views

Circuit design for controlling 6 individually selectable motors

I need to control 6 of these DC motors from an Arduino. If I needed to control them entirely independently, the obvious choice would be 6 H-Bridges, but I have somewhat relaxed constraints, so I'm ...
10
votes
5answers
35k views

Braking a DC brushed motor

What would happen if I short the terminals of a DC motor together while power is disconnected but it is still freewheeling? According to several sources, it would brake the motor. This makes sense. ...
-2
votes
1answer
386 views

I am thinking of designing an electric car and am wondering about the best way to drive the wheels

I'm thinking of a light cart - barely enough room for one person and the batteries. What do you think would give me the best battery life? I am thinking a (brushless?) motor with the input voltage ...
5
votes
4answers
2k views

Why do we need brushed motors?

Looks like brushless motors are more convenient - no brushes means no maintenance required. For example, power tools manufacturers often cite that graphite brushes need to be replaced every 50 hours ...
5
votes
6answers
3k views

What causes “hard working” growling sound in a heavily loaded electric motor?

From my experience just any electric motor when under huge load would make recognizable growling sound. This would happen regardless of the motor type - brushed/brushless, AC/DC, small size/huge size -...
4
votes
1answer
3k views

how to read battery spec?

I window shopped for a small size battery. On the battery specifications, there are: capacity(mAh) : 85mAh Pulse Current(mA) : 190 Cycle Life(Times) : 300 What does Pulse Current mean? Does it ...
7
votes
1answer
3k views

Using a triac to switch on/off a single phase AC motor

I want to use a triac controlled by a suitable optoisolator such as a MOC3020 to switch a single phase AC motor on and off, like the ones you'd find in a typical desk fan or a blender or similar. I ...
2
votes
3answers
240 views

Connect a 8 V motor to a 16 V battery

I am hacking a vacuum cleaner robot by trying to control the motors with an Arduino. I have then two 8V motors, each one needing from 50mA (when the wheel is turning free) to more than 1A (when the ...
4
votes
3answers
2k 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 ...
8
votes
2answers
2k views

Can I get a pair of schottky diodes in a single chip?

I'm building a motor driver circuit, and am looking at diodes to clamp the output voltage between the supply rails. Apparenly, I should use schottky diodes for this purpose. My question is, are there ...
2
votes
1answer
514 views

With the case of stepper motors, what correlates to the max RPM of the individual unit?

I'm looking at a few different stepper motors for an engineering project I'm working on, and I'm attempting to tease out any correlations that a stepper motor's stats would have with its maximum speed....