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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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4
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3answers
8k views

Using a motor to open doors

I have made a wooden case to hold both my Xbox 360 and my PS3. It's as wide as both consoles laid down next to each other and as high as the console. it has 2 doors on the front, one for each console. ...
3
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3answers
9k views

What is good device for generating vibrations, offset weight motor or solenoid or some other?

I am building a vibrating device for that I am thinking to use a solenoid for vibration. The solenoid will be used such that device will be mounted in the floor and when a stick is put over solenoid, ...
2
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1answer
831 views

Metal sleeve around cassette player motors?

I have recently taken apart a few cassette players to get motors, and I have noticed there is always a metal sleeve around the main drive motor. Here is an Ebay product photo showing this on a ...
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2answers
809 views

Why is this capacitor hooked up to a 9volt electric motor?

I took apart a sharper image personal fan run by a 9volt battery. I understand a resistor is sometimes necessary, such as when preventing light emitting diodes from burning out. How about a 9volt ...
2
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2answers
2k views

Does reactive power of induction motor vary with load?

I know that the power factor of an induction motor varies with load and is very low at no load and high at full load, but does the reactive power vary as well? If so, how much can it vary?
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1answer
379 views

Limiting current for high amp motors

What will happen if motor requirement due to more load is high(lets say 5A) and we limit current with current limiting circuit to lets say 2A. what will happen.. will it work without anything getting ...
1
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3answers
847 views

Is resisting DC motor bad for it?

If I keep the shaft of a DC motor in place while it is running does this harm it in any way? Is it bad for it at all?
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1answer
731 views

12 Volt vs a 24 Volt Motor

I have read that using a higher voltage motor would need less current to get the same power. I understand that P = IV and how that works. My question is if the 24 V motor would get half of the current,...
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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 ...
0
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2answers
75 views

Rotating a motor according to calculated output [closed]

I have 13 photodiodes. Positive connection from battery is connected to the positive end of each photodiode. The position of photodiodes is as shown below: ...
0
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1answer
285 views

How much DC voltage is needed to brake a 3 triphasic motor?

What would the nominal parameters of the bridge rectifier and the transformer be?
0
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2answers
95 views

Question about AC servo motor driver

Does anyone know what means when AC servo motor driver displays error code for "regenerative discharge", and stops working. What this mean in practical situation. This happens from 1 to 10 minuts ...
0
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1answer
394 views

What is the SKU of a motor? [closed]

I came across an 'N20' motor, and I don't know what that means. As far as I can tell (and please correct me if I'm wrong), N20 is the SKU of the motor. What is the SKU?
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1answer
5k views

Using hard disk motor as generator

I have disassembled 20 broken hard disks and taken out the motors, thinking they might be useful. However, they didn't work using DC current, because they required some kind of control circuit. Now I ...
0
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3answers
1k views

What determines how much power the motor 'draws'?

I'm new to electrical engineering, and probably asking the wrong question. Not sure how else to phrase it. For the question, I'm going to use an example layout of simply a 9v battery attached to a ...
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2answers
2k views

Can Average Power of a 3-Phase AC motor be calculated from Mean Current & Voltage RMS from each winding?

If this is possible could a formula be provided. + Explaination. Thanks very much in advance. FYI I am completely new to this site so please be kind. Could I ask that any criticism be constructive. ...
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2answers
59 views

Fused disconnect for 3 motors [duplicate]

I want to know one thing about a fused disconnect. If it's fused for a certain amount of current, would you be ok with not adding additional fuses to protect your loads? If you have a 30 A fused ...
0
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1answer
865 views

L293D outputs different in different motors. Are there different types of DC motors?

I recently picked up a used Spider King RC toy from a thrift shop (http://amax-toys.en.alibaba.com/product/337890538-212191267/rsc_9021_RC_Spider_King_car.html). It had no remote or battery charger ...
28
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2answers
59k views

Difference between Brushless Motor and Stepper Motor

I think I understand the operating principles of a brushless motor and a stepper motor, but I'm a little confused about the difference. Is a brushless DC motor a very basic stepper motor? With ...
28
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6answers
63k views

How to drive brushless motor with Arduino?

Is it possible to drive a brushless motor directly with Arduino? Or should I revert on controlling a brushless motor ESC with PWM pulses?
7
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1answer
44k views

What is the purpose of the Motor Run Capacitor?

Looking at a control box for a marine Air Conditioner and it has a HUGE capacitor in it. The schematics label it a "Motor Run Capacitor", but I always thought it was just used to start the motor. ...
18
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3answers
3k views

Why don't all motors burn up instantly?

A motor rated for 3S (11.1 V) has an internal resistance of 0.12 ohm. The maximum current is 22 A. 11.1 V / 0.12 ohm = 92.5 A Doesn't this mean ...
9
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4answers
14k views

Why use DC motors for driving elevators?

This New York Times article says that on November 14, 2007 Consolidated Edison Company was going to end supplying direct current to the remaining several buildings that used those to run elevators. I ...
9
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4answers
2k views

Methods to accurately move an object across a 2-D plane

This is the opposite/complement of my previous question, which concerned measuring the precise position of an object as it is moved/drawn by someone over a short duration. Assuming I use one of @...
8
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6answers
2k views

Asynchronous motor with motor capacitor sometimes won't run backwards when it should

The long story short: Is there any chance that an asynchronous motor with a run (or start?) capacitor fails to run backwards when the capacitor ages and loses a significant portion of its rated ...
8
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5answers
16k views

Computer controlled water valve

I'm working on a computer-controlled indoor waterfall. One of the requirements is to be able to change the water pressure via computer interface. I've googled all day long and can't seem to find a ...
5
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1answer
7k views

Explanation of Lq, Ld and how it relates to motor inductance

I'm pretty much a novice to motor controls, but I was wondering if any of you could explain the concept of d-axis and q-axis inductance and how it relates to the inductance L that is usually specified ...
9
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2answers
42k views

how does the circuit of a basic Variable speed electric drill work?

i am trying to 'automate' the control of an electric drill motor that im taking from a garden variety Variable Speed drill (from Harbor Freight) it has a universal AC motor which I basically ...
9
votes
4answers
8k views

How to achieve very accurate/fine rotation with motor

I am running an experiment where I need to rotate a lightweight dial (<5 grams, so very low torque requirement, and fairly slowly), but need to do very accurate, fine steps of 0.03 degrees. ...
8
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2answers
3k views

Can Arduino Mega handle 6 motors independently

I wonder if anyone can help me I am modifying an ROV and thinking of using Arduino Mega I am new to electronics and robotics and wonder if the Arduino Mega can control 6 DC motors independently as ...
5
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3answers
3k views

How these laser show systems work

I am trying to understand how laser show galvanometer systems like this one create high-resolution movement, and generate drawings of reasonable precision (w.r.t. minimum beam angular-deflection step ...
4
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0answers
112 views

Modeling scalar control of PMSM

I have met with a scalar control algorithm for a permanent magnet synchronous motor. I haven´t heard about it before so I decided to develop a dynamic model to further analyze this control algorithm. ...
4
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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 ...
3
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2answers
24k views

3 phase induction motors with poles not equal to 3x

I am having trouble finding diagrams to show induction motors with poles not equal to 3x. Everything I find is 2 poles per phase. Can anyone explain and help me visualize, for example, a 4 pole 3 ...
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5answers
4k views

Does cassette tape change its velocity while playing?

Looking at the old cassette tape, From the POV of the head, let's say that it reads at speed \$v\$ (the magnetic medium scrolls at speed \$v\$). But looking at the right wheel, which is the one that'...
9
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3answers
10k views

DC Motor - PWM vs Voltage

When controlling a DC motor that is rated at 5V theoretically I can drive the motor in these ways: 5V with 100% duty cycle PWM. 10V with 50% duty cycle PWM. 20V with 25% duty cycle PWM. Is there a ...
8
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2answers
3k views

Controlling a very small DC motor with PWM?

I have a very small DC motor (from a Walkman), I would like to control the speed from a micro-controller. For that I would like to connect a MOSFET in series and apply a PWM signal to its gate in ...
7
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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 ...
7
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4answers
4k views

Why Have Non-Zero Timing on a BLDC?

I've heard you can go faster in one direction if you adjust the timing, but do not understand why? I have a sensored bldc motor with a 30deg shift of the hall-effect sensors, tried going forward (CCW ...
5
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2answers
8k views

continuous servo position control

With a continuous rotation servo I can control the direction and the speed of the servo, but I need to control the position as well. I know it's not possible directly due to lack of feedback control ...
5
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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\$...
5
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2answers
21k views

How to tell whether a motor is an AC or DC motor?

I watched a youtube video http://www.youtube.com/watch?v=hT3jJRGVdW4 The man says : by spinning the motor to see whether the output is AC or DC, then it can tell whether the motor is generating AC or ...
4
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2answers
6k 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, ...
4
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5answers
1k views

How to avoid damaging relay used for controlling motors?

I've got a circuit with two DPDT relays controlling a motor - the diagram below is borrowed from a related but different question. RLY1 turns everything on and off, RLY2 switches the direction of the ...
4
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1answer
3k views

DC motor starting and stopping

I'm powering a motor, and instead of rotating at a constant rate, it rotates roughly a third revolution every half second or so; the rotation keeps starting and stopping. There's no load on the motor, ...
4
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2answers
478 views

How is this extremely high-resolution stepping achieved?

This question pertains to this video as well as this one by the same person demonstrating his results with a stepper motor (along with a really neat testing method involving a laser spot on a wall a ...
3
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2answers
14k views

Understanding how much power a stepper motor draws

I had a previous question describing a power management system where I was trying to power 7 stepper motors from a wall outlet (with switching power supplies and motor drivers). I realized during this ...
3
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2answers
3k views

Is it possible to change the speed of an AC motor(drill press) without losing too much torque?

I have a drill press as in the image below, it runs from 110V AC 60Hz and has internal belt reduction. Unfortunately however for some materials and hole widths, I need it to go even slower than It's ...
3
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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 ...
3
votes
1answer
2k views

H-Bridge freewheeling current

I'm building an H-Bridge to drive some motors I have around. I'd like to have a bridge that can be powered by different power sources, for example batteries or atx power supplies interchangeably. I'...