Motors Definition and 325 Threads

Hello. I'm new to this forum, and will probably be harrassing you all with questions for quite some time. My first question deals with electric motors and how they function. I am currently in a Physical Science class in my college. For whatever reason I cannot seem to get a firm grasp on how...

hi all I m designing a AGV (automatecd guided vehicle),i use DC motor and step, i have read a catelogue motor,but i don't know how to chose motor pertinently. More information about the motor http://www.motionking.com/Products/Hybrid_Stepper_Motors/HB_stepper_motors.htm"...

Can the wire windings in an electric motor be ferromagnetic and still operate? Why?

For a proposed Hovercraft propulsion system, 1a) Is it feasible to use separate hydraulic motors to power a) four wheels for land propulsion, b) two water propellors for water propulsion c) two lift fans d) six actuators for retracting / deploying the wheels and propellers. 1b) Can the...

Hello all, I was wondering if it is possible to increase voltage if you combine 2 DC motors together? I know that it is NOT possible to increase the voltage if you put it into a series circuit since it won't work. As for the batteries you can increase the volts if you put them into the...

Is it true? Does this really defies a law of physics? (More output than input). or is it bluff...

Dear engineering gurus, I was wondering if some of you might be able to help me out with my project (2 part question): I'm basically trying to make a rotating plinth (like those used in jewelry displays - except i need it to bear a weight of 1kg. (Most ready-made plinths won't take...

What causes the back emf in motors (brushless DC motors to be exact). First thing is the rotating magnetic field of the rotor, which cuts the stator coils inducing an emf in the opposite direction. This would increase as speed increases. This is just a generator. Second, what about self...

I have an electrical engineering question for all you electrical engineers! If I have multiple motors in series, there will be a voltage drop due to the internal resistance of the motors. What will this look like for the motors? Will each motor experience a different voltage or will the...

we were learning about electrical motors in class the other day and my teacher mentioned linear electric motors, which from what he said are basically standard motors 'unravelled'. i was wondering why, if this is the case, you would ever use a standard motor when linear motion was required? why...

Hello Forum , anybody has an experience with HDD motors , how can be connected to a microcontroller ? Thank you in advance Anita

How can we vary the speed of hydraulic motors running through a constant output pump??

I'm working on a project that needs to power two electric motors (PC case fans). These fans are rated 12V - 0.3 A. The power source is a AC-DC adapter that outputs 12V and rated for 0.3A. My question is simple: should I wire these motors in series or parallel maximum their speed? I have a...

I have a motor i am trying to get to work. The tag on it says its a three phase asynchronous motor. 110v and i think the current is 6.9amps. When i turn it on it hums and if i spin the motor it will start to go and will spin very slowly but as soon as any resistance is applied it stops and just...

Hi, I am a novice. I have very sensitive high end audio equipment. I want to power them up from an independent source. I was contemplating using a electric motor driven generator. I want to do this to supply cleanest power to the equipment/electronics. My power requirement is about 5 KVA. I am...

Hi guys, I have a question about working out the capacitance of a capacitor. I am not great at electronics, but if i understand correctly the capacitor in a capacitor motor is what makes it start spinning. I'm wondering is anyone could recommend a good resource for reading about how this...

Hello All- COuld someone please give me a primer on DC as it pertains to voltage, amperage and wattage. Specifically, if I have a motor that i need to run at very low RPM (50 -150), how does the motor compare across a 12v system vs. a 24, 48 or even 60v system. Do 60v systems run more...

The design I am building is like the simple DC motor design on http://www.coolmagnetman.com/magdcmot.htm I need some help in understanding how the shape of the loop of current carrying wire (like the difference between a square and circle shape) figures into determining the rpm on a simple dc...

I'm trying to find a DC motor in the 3-3.5kW 12-24V range (Preferably 24V) for a project that will utilize the motor at maximum power for occasional short bursts of maybe 2-3 seconds in duration at most. The motor needs to be fairly small, lightweight, and CHEAP ($100 or less). Starter motors...

Alright this is hard for me to write because I feel like a backstabber but I need to stop him before he destroys my family. My father is a very smart small business owner and inventor and he is very near hitting it "big" with one invention. However, he has another project in the works that is...

I am working in an Auto Parts manufacturer company which one of its production is DC motors used in different wheicles. I have two type of question about a DC motor : 1: we have a new model DC motors which get too hot. what's the reason? what does the effect of the thickness of cooper wire...

I'm ready to begin proof of concept experiments on the Mk IV Tesseract, following on the limited success of https://www.physicsforums.com/showthread.php?t=205845" What I need is a motor that - is reasonably compact (we're talking <2 centimeters) though weight is not a factor - can be...

Hopefully this is the appropriate forum for this sort of question, but I was wondering if any of you might know where I could buy small brushless DC motors online. I've been Googling around for a while, but most of the ones that I found are too large and expensive for what I need, as they're...

Hi people, im new to this forum. I'm currently working on a underwater ROV for my school project. We did a experiment recently on the performance of our ROV. We met up with some problems on the motor & the propeller for the thrusting. The motor stalls just after 5secs. So I am thinking is...

Hi, I have a question about synchronous motors. If the DC field winding of a synchronous motor were to be replaced by a low-impedance short-circuited coil and the stator were to be supplied with 3-phase AC, would the rotor spin? If the answer is yes, would the rotor follow the direction of...

Homework Statement Eliza connects a power supply, switch, and a multimeter (in ammeter mode) in series with a wire coil. The wire coil is held into place by 2 connecting wire leads. One of the wire leads has been stripped off of the insulating enamel coating so that half the wire is bare; the...

I have been doing some research on pure magnetic motors. I have seen countless vidoes on youtube.. [ http://www.youtube.com/watch?v=ZI4NDrPQ2rA&feature=related ] for one. In these type of motors use the concept of "reshaping" the magnetic fields to allow unidirectional force on a rotor...

Hey everyone I'm a physics student doing my last year of high school in Australia. For an assessment task I have to do a practical investigation on electric motors and generators but I am a bit lost on this subject. I need a few ideas that are easy to understand and prove/disprove using a...

Hey there, I've been searching online for a quite a decent amount of time trying to wrap my head around this concept. We've been asked to research the link between Lenz's law and DC motors, and for some reason I was given the impression that back emf was a positive to DC motors. After...

Hi everyone, I'm a graduate mechanical engineer and I was wondering if I could open up the discussion of 2-pole versus 4-pole motors. Recently I have had to specify such motors for work and wanted to find out the advantages and disadvantages of each type. Mechanically I realize that 2-pole...

Tesla Motors claims a "well-to-wheel" efficiency of 1.14 http://www.teslamotors.com/efficiency/well_to_wheel.php" What in the blue blazes are they talking about?

What is the use of having capacitors in fans, cooler motors or other electric motors ?

If we build a High Temperature superconductor without Meissner effect ; So it can build energy?:confused:

hey does anyone know the effiency and power factor of a typical three phase induction motor? cheers,

I am not asking if they are considered as input into the armature's magnetic field. I strongly believe they are NOT even considered when designing motors. The question is, "DO THEY EXIST IN MOTORS?" Based on evidence from conventional theory, it appears they do infact affect the output of...

Is it possible for electric motors to compare to the strength of human muscles, in terms of power-to-weight ratios? That is, with the proper engineering, is it theoretically possible? I don't see why not, simply increasing voltage increases power, if the heat generated is a problem, can't the...

This may not be the place to ask this question, but I can't seem to get a good answer anywhere else...I have a manufacturing company. I am on a 3-phase demand meter. I'm trying to figure out if it is more cost effective to shut all the electric motors down during breaks and lunch and restart...

Hi, I am designing a small EV and I am looking forward to some guidlines regarding designing of H-bridge (torque) controller for controlling somewhat in between 6-8 permanent magnet brush DC motors , the overall power required from these motors is between 70 to 250 W, where 70 W is for...

Hi I Have Got An Assignment On Applicatiions Of Dc Shunt Motors And Dc Shunt Generators. Plz... Guys Post Ur Replies Soon. Gotta Submit It Tomorrow

What does it take to manufacture such a syringe pump? What kind of motor is usually used in these systems? http://www.macros.com.tw/p_kds.asp

Name the methods of coupling motors to drive a load...

Hello. Im building a small car, that should be able to navigate/drive arround on it own. The short version of my problem can be stated as: 2 DC motors, 1 compas ;) The two DC motors are PWM controlled, and dispatch magnetic noise all arround. To be able to work with my compas, I would like...

I was thinking in the last weeks about electric cars and thinking about a DIY project in a future. Here's the problem, which motor is best for an electricar? Which have the best efficiency, torque and speed? Now considering that choosing an AC motor an inverter is needed and there would...

I want to make a small robotic arm and control program like the kind schools use to teach kids about robot arms. I need alittle guidance though, I only know how to use C++ to say "hello world!". How would one go about making a computer program to control a stepping motor? And how do I choose...

There seems to be quite a dramatic price range for high power DC motors, and I was thrilled to find this link while searching for solutions for a work application. The prices blew me away when compared to those found at the standard motor suppliers...

Hi, I am working on an EV and the problem is in sizing or selection of dc motors. I have to select few small PM DC motors instead of a big one, the purpose is to pull a wheelchair, I have the mechanical quantities with me required to turn a wheel: Torque required is 43 N-m Power required =...

Homework Statement What are the differences between AC synchronous motors and AC asynchronous motors. Also, what are the simple and non technical differences between AC and DC motors. Homework Equations The Attempt at a Solution

1) will a 12v 3.5amp/hour battery support a 120v - 4.7 amp motor? if not kind of battery specifications will. 2) Is an electric motor a DC or AC. help is much needed,thank you.

Hey everyone, Just something for you to think about, My school has just started a project do build an electric power car, (for more info please look at our website http://greenpower.aldenham.com ) and we have come up against the problem of how to regulate the power going to the motor. We are...

wat is the right hand rule and how do u use it.is there one for motors to.