Electric motors Definition and 51 Threads

Hi I want to know the power efficiency of linear piezo electric motors in percentile.

There are small 15kw electric motors <$500*. LiFePO4 batteries that offer 60kwh** weigh <50kilograms, cost <$500, take as much space as the gas used to take. The hood could be removed or replaced with extra seats or used for cargo. Ultra-lightweight 3D printed magnesium bodies*** should be...

Current drawn by motor = ##\frac{120-75}{90}## = 0.5 Amps The answer says the power output of the motor is 37.5 Watts. The only way I can get that answer is if P = IV = 0.5(75) = 37.5. This implies that in an electric motor, the back emf is the voltage of the motor. This confuses me because...

Attached are some Sliding doors images. Can they be operated with a remote control device? The remote control device will have buttons for opening & closing the left and right door. What will be the design & construction changes in the sliding doors so that they can be operated using a remote...

I have to write a report about one of three motors AC type Motors, DC type Motors, Stepper Motors. I am wanting to now if anyone has any insight into which one I should talk about, which one has the most information and would be easiest to write a report on. Thanks

Hi All, So i am looking to buy a petrol generator to run a 2.2KW electric motor. I was thinking of getting a 3KW model which under normal conditions this should be ok - but on start up I've been told an electrical motor draws 6 to 10 times the normal load, which is way too high for the...

I remember (long ago, in college physics) learning about electric motors and generators, specifically about the "exciter" coils in generators which did a better job than permanent magnets, because of a sort of "turbo" or force-multiplier effect. I notice, however, that while basically ALL...

I've had a side project in mind for a while involving motorized Rollerblade wheels, however I need to figure out a motor size that would give me the needed torque to actually accelerate 250lbs up to 25mph. I realize even a 5hp electric motor is large but I was wondering if ohms have any affect...

On average, which has higher power to weight ratio between the two? So on average, if both weighed the same, which one is going to have more power?

Is it possible for an electric motor to exist (based on our current understanding) which is capable of applying continuous upward force upon an object, enabling that object to fly or lift above the air?

Ok so when we have a current carrying conductor inside a magnetic field there would be Laplace force ##L\times Bi## which is the macroscopic form of the microscopic Lorentz force ##v\times Bq## in a large number of electrons ( or it is not ?) But also there will be hall voltage which will...

Hi all - This may seem like a very simple exercise, but for some reason it's giving me trouble... I am trying to determine the difference in energy (ultimately looking for kWh) used between two different electric motors by utilizing instantaneous torque measurements I have. I would like to do...

Hello everyone, I want to build my own computer desk for past few years and soon I will have enough money to do so. What I am trying to do is make it look like normal desk and by pressing "THE"button all monitors will raise up from inside of it. I quickly sketched some mechanism so you can...

I have noticed there are a few designs for permanent magnet brushed DC motor, but I can't seem to find the benefits and downsides of either one. The first one (first attachment) uses three electromagnets placed on a triangular rotor. There are two arc permanent magnets on the outside. In this...

I have been reading up on electric bike motors, there are a few things regarding size and wire gauge that have me confused. I have seen disassembly videos of around 300 watt electric bike motors with planetary gears, and I can't see how anyone can push through 300 watts through the wires without...

So for a school project I got to design an electric car that can meet minimum range and top speed requirements for how heavy it is. I have calculated the amount of power needed(kW) for its heaviest load situation to reach the min speed and range, along with the necessary energy(kWh) required...

Please help me, this is my last hope. I am an el. engineer student and i need GOOD books on electrical machinery. My proffesor is more a good repairman than a great scientist who could teach me about all the theoretical (matematical and physical) concepts which have led to modern design process...

Do all electric motor's follow Faraday's law and Lorentz? Is it safe to say generalize that statement?

Greetings, everyone! A couple of my friends and i started work on a project regarding VTOL aircraft design. We are interested in the concept of propelling the air vehicle via propellers rotated by electric motors. As all of us, have relatively limited knowledge on electrical...

hello I am really new to engineering. i know the rock bottom basics of these stuff but really rock bottom. i have a couple of questions regarding electric motors: 1)torque- what makes a motor have more torque? 2)rpm- what does that effect? and if I am not mistaken higher...

What is torque in electric motors? And why is it largest when a single armature is horizontal to the field?

a concept i can't grasp is the meaning of voltage for an electric motor. it seems all the motor needs to operate is a magnetic field which is generated by current. why does the electric motor "care" whether the current is fed to it from a 100V or a 200V battery? Isn't the concept of voltage...

I wasn't sure whether to put this in the mechanical engineering board or not but since electrical engineers typically design electric motors, I'll put it here. From what I hear, all types of electric motors have terrible power-to-weight ratios. So if we were to hypothetically one day have a...

Hi guys, new here to the forum. I was an electrical engineering student but am now working on more of a mechanical issue so I'm a bit out of my element. I am working with a small electric motor attached to a gearbox. The final gear opens and closes a metal valve. I am having trouble finding...

I like pure electric cars but one thing that sometimes annoys me is how quiet they are. Many car enthusiasts will never buy electric cars solely because they don't sound as "cool" as a roaring internal combustion engine. Also, it is dangerous for cars to be so quiet. Many pedestrians and drivers...

Hi , maybe a pretty simple question and about things that we have long used and know well but is there a electric motor or generator that is truly DC? As much as I think there isn't because either to create , induce electricity in windings (generator) u got to have a changing magnetic field...

I've been told that a 747 will never be able to be propelled by electric motors even with room temperature superconductivity because batteries have too low of energy density. So if hypothetically we were able to develop a battery with energy density as high as jet fuel, would electric motors...

What is the effect of the Circuit Frequency on the Electrical Motors which runs the production line! For example if we had like 3 - 4 Motors! Effect on: Efficiency of the motors! Speed of the motors! What about if we had a " Servo Motor " which runs one of the machine!

What exactly makes the motor consume the electrical energy? I s heat dissipation higher that in a normal coil? Is it counter-electromotive force? What makes the voltage drop? Thank you regards

Choose between two: A. Permanent magnet motors( Being the shaft/rotor) B. Non-magnetic material( Same being the shaft/rotor) Give me you're answer and a detailed explanation why please!

hi, this is not a question from Hw its pure interest. 1.lets say i have an electric motor with a shaft radius r lengh L, and at its end there is a metal disk with radius R and thickness b. if the motor supplies torque τ what would be the momentum on the disk? i was thinking that i the motor...

In all the electric motors I have taken apart, the coils on the armature have never been insulated. This has always confused me because, how could the coil make a sufficient magnetic field if it shorts out to the adjacent wires from lack of insulation?

Hello, I'd like to ask if anyone could give me information or a link to web page where I can find some for the most advanced high speed electric motors used today in cutting machines - speed range, torque and etc. I tried to find searching in Google but I haven't found anything. If someone...

1. Small electric motors with only one armature loop sometimes get stuck. They can be started again by giving the armature a small twist. Looking at the diagram below, what might be the explanation for the motor not being able to start on its own? When the brush(es) reaches the split within...

I was wondering if there is anyway to get more wattage out of a 1000 watt motor?

Just curious how electric motors work, specifically DC motors. I have some questions i would like to understand better. do the windings of a motor determine the required voltage to power it? Can a 110 volt ac motor be powered by a 12 volt dc battery without an inverter? Can a 110 volt...

Hi there, I have recently been working on a project that involves building a mechanical dolly that is driven by 2 electrical motors. I have decided to use 2 electrical winch motors which each have a rating of 5700kg and a drum size of diameter 64mm My question is, how do I calculate...

Hello. I want to work with Photovoltaics and with the renewable industry. Electric motors, boats, cars. Is EE a good choice? I was thinking first in ME but looks like you see more of solar energy in EE. Please i need urgent advice i only left like 2 moths to make a choice.

Simple question. I've been reading qualitatively about the torque and power curve of electric engines versus internal combustion engines. I'm led to understand that electric engines get much higher torques even at lower speed. One argument for why electric cars are inherently more efficient than...

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

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...

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...

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...

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

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...

can u modify an electric motor so that it uses a motorcycle battery as a power supply?how? and used for a grass trimmer...

I am trying to implement an electric motor as a generator at the end of a steering wheel shaft. The motor would be used to apply a resistance torque to the shaft. What type of motor would you recommend?

I have three questions that I am pretty confused about: 1. A slope rises 15m veritcally for every 40m of its length (in horizontal direction). A car of mass 1.25t travels a distance of 150m up the slope at uniform speed. Find the work done if the frictional resistance is 40N. 2. A...