Rotor Definition and 141 Threads

Hello guys, I am trying to build a permanent magnet generator, I have 48 magnets and 18 coils, and I am hesitating between 2 configurations. Configuration A: 2 huge steel plates with 24 magnets on each and an 18 coil stator between them or Configuration B: 4 smaller plates stacked to sandwich 3...

A lab mate and I got into a discussion on how to properly balance a swing bucket rotor. This is different than a normal centrifuge in that there are buckets that swing out once spinning begins. In a standard centrifuge balancing is simple - it's just the same weight directly opposite your...

Homework Statement The AC power supply is connected to the stator terminals of the induction motor and the dynamometer. The rotor terminals are left open. The AC power supply is then turned on. I need to find voltage between any two of the open rotor terminals. Homework EquationsThe Attempt at...

Homework Statement I have a set of data that I need to use to calculate the stator to winding turns ratio. A hint was given: "The rotor current measured is the rotor winding current. However, the rotor current we use for our calculations is the current referred to the stator side of the...

The free boy diagram of one person inside the rotor should have three vectors: weight down, friction up, normal to the center of the cylinder. Is friction force given by centripetal force * static friction coefficient? Normal and centripetal are the same vector in this problem. Is minimum...

Homework Statement By evaluating the "volume" of the relevant region of its phase space, show that the number of microstates available to a rigid rotor with angular momentum less or equal to M is (M/ħ)2. Homework Equations Consider the motion in the variables θ and φ, with...

For shaping an interior PMSM rotor from top figure to as in bottom fig, I made an equation based curve, united with another curve , made a surface using coverline and united that shape with my rotor. When validated it showed band and rotor intersecting and I adjusted the band - DiaGap. Then...

Homework Statement A locked rotor test is performed on a permanent magnet DC machine with the following results: Terminal Voltage 5 V DC Input Current 10 A DC Locked rotor torque. 20 Nm a) Making suitable approximations deduce the effective rotor resistance in ohms? b) Making suitable...

Hello, Happy New Year everyone. I wanted to know or can anybody show me how would a rotor like that look like or how it would be wound? I need the rotors outer part that faces the stator to have a single magnetic pole coming out of it , not like typical rotors that have poles on them and one is...

Homework Statement I have a system of five coupled ODEs. I believe I should be able to reduce it down to four coupled ODEs, but I am not sure how. This system is modeling a quad X rotor where the arms are viewed as end loaded cantilever beams with motors attached. Homework EquationsThe...

Hello all, I am currently involved in a diagnostic project for an induction motor with suspected rotor stator contact. all critical dimensions have been checked but the question has been raised by none electrical observers: Does the location of the rotor bars effect the magnetic center line...

Has anyone ever heard of a rotor winding that can be interchanged with different shaft lengths? I'm trying to find a way to create a 3-phase alternator with a through shaft to attach pulleys on each end.

Homework Statement A helicopter is hovering in a steady cross wind at a gross weight of 3,000lb. The helicopter has 275 hp delivered to the main rotor shaft. The tail rotor radius is 2.3 ft and has an induced power factor of 1.15. The tail rotor is located 15.3 ft away from the main rotor...

Homework Statement In the Rotor Ride at the NM State Fair, passengers stand with their backs to the wall in a giant rotating drum with a radius of 10 feet. The drum is brought up to a speed of 33 1/3 RPM, and then the floor is lowered, leaving the passengers suspended above a giant hole in the...

Good evening, Before I start, I'm sorry if this is in the wrong forum, I wasn't sure where to post such a question. I have an car alternator which I'm going to be experimenting with to generate electricity from the wind. It's a GM Valeo model, possibly taken out of a Vauxhall. Right now...

hi there, i'm trying a to simulate a savonius rotor in simulink. below is brief summary of how much i have done:- 1. derived the equations for torque. 2. MATLAB code done. 3. in simulink the equation I'm using to get the angular velocity and angular position is T...

Hi, Just wondered why the rotor of a gas turbine (generally inside) is not made stationary and the casing (drum that surrounds the rotor) made to rotate...kind of reversed gas turbine... One limitation i thought about was the combustion can placement... Any other views as to why we don't see...

Specifically, this is all to do with rotor size of brushless DC motors and how it plays a part in calculating angular velocity / volts / amps / torque. There is no single equation to be solved here. Any relating information or equations..., any and all, please jump in. I've been looking at all...

Hi From what I understand as the rotor yaws, there are gyroscopic forces that act upon it and the magnitude of these depends on the speed of yawing (e.g. 10 degrees per second). What happens to the rotor rotational speed during yawing? Does it slow down? Is the aim to slow down the rotor...

hi, There is one thing that I do not understand and nor do I find any direct explanations for it. Is there any relationship between no of rotor poles and no of stator poles in BLDC motor (or PM Synchronous Motor)? I have read somewhere there doesn't have to be. I can imagine if no of poles are...

Hi, When a load is applied to the rotor of an induction motor, the rotor speed decreases and as a result, the induced currents in the rotor and the torque produced increases due to the relative speed difference between the rotor and the rotating field within the stator. My question is...

3 Phase Rotor / Stator Swapping ? I have been toying around with the following idea : (specific application project) Normally a stator is the external housing of a motor and is fixed to a structure - the rotor is the shaft through the middle of this stator etc. and is rotating at ...x... RPM...

is the rotor rotating magnetic field(R-RMF) present in squirrel cage induction motor (SCIM). Is it same as in 3 phase ROTOR winding of slip ring induction motor (SRIM), generating rotor RMF. * THE 3 phase, supply given to stator 3 phase winding of SRIM, generates (RMF), which cuts the rotor 3...

Homework Statement Consider a molecule with an electric dipole moment d. The Hamiltonian of a molecule in the external electric field E is: \hat{H} = \frac{\hat{L^2}}{2I} - dE \cos{\theta}, where the polar angle \theta characterises the orientation of the molecule. (We have chosen the field...

Homework Statement Consider a rigid rotor with moment of inertia Ix = Iy = I, Iz = (1 + ε)I Classically, his energy is given by, E = L^2/2I. (c) What are the new energy eigenstates and eigenvalues? (d) Sketch the spectrum of energy eigenvalues as a function of ε. For what sign of do the...

Consider 2 cases case 1: no of rotor poles = 2 no of stator poles =4 case 2: no of rotor poles = 4 no of stator poles =2 What will happen in case 1 & 2 ? Will Induction motor run?

In a 3 phase slip ring Induction motor, 3 phase balanced supply is given to rotor winding & stator winding is short circuited . Then rotor would - run against the direction of rotating field. Can anyone explain this phenomenon?

Hi. I am curious about ways to sense the position of a rotor in a BLDC motor. I am familiar with hall sensors and back emf but am wondering if there are other ways to find the position of a rotor maybe more accurately. I had an idea about using a laser and a photoresistor around the...

i was reading an article about the Kaman K-max being used as a UAV, and there were comments about how this helicopter is harder to fly than a traditional main-and-tail-rotor helicopter ... the large number of accidents of the K-max also seems to suggest the same thing why is this? to me, the...

DC motor rotor + stator : torque by attraction ? [Solved] So on that image there's a very simple dc motor. Knowing that F = B*I, the force acting on the wire can be represented as on the image. Also the current passing through the rotor will create a magnetic field, represented by Brotor...

Ok, here we go. In a rotating mechanism (helicopter rotor), at a state of equilibrium, the rotor consumes a certain amount of energy from the shaft to maintain a constant angular velocity (since there is a measure of resistance present over the span of the rotor). Lets suppose that the...

Hello, Generally and specially in AC motors, what is the effect of the no of poles of the rotor on the motor performance? if it's same or less or more than the no of poles of the stator? Thanks

What will happen if the rotor speed becomes larger than the synchronous speed for induction motor?

Hi I need to perform a material selection case on the rotor of a steam turbine. Both material selection as process selection have to be made. Since my background is rather chemical than mechanical or material engineering I've encountered some difficulties. I hope you can help me with them. For...

How would you calculate the acceleration of the following two points? http://img341.imageshack.us/img341/917/helicoptor.jpg Uploaded with ImageShack.us1) The tip of the helicopter blade The diameter of the hub = d The length of the rotor = l The flapping angle: theta = A sin(omega*t)...

Hello, I have problem with an old asynchronous motor with wound rotor it is VEB MEZ VSTEIN.I am intending to run the motor via frequency inverter by connecting it to the stator windings. I need to short circuit the rotor, but there are 6 poles coming out (a,b,c and a0,b0,c0) from the wound...

What will happen if an induction motor is fed from rotor side. I mean if i supply say 50HZ frequency supply to rotor through slip rings and have my stator windings connected to variable resistances will the rotor start to rotate and if it does in which direction?

Hey guys, I have always wanted to know the difference between propeller and rotor though they are used for similar applications. I never researched on it until now when I had to write it down as one of my assignments. Any answers will be appreciated and also if anybody can refer me to any books...

I'm having a tiny debate with someone over whether a 2nd coaxial rotor generates additional lift for a helicopter by itself or the helicopter has additional lift only due to the elimination of the tail rotor so 100% power goes to generating lift? My theory is that it does not generate...

Homework Statement I am trying to find the angles (theta, phi) it is most probable to find the rigid rotor for the spherical harmonic m=1, l=1 Homework Equations The equation given is Y = (3/8pi)1/2*sin(theta)*ei*phi The Attempt at a Solution I have tried to solve it by...

I am currently taking a modern physics course, and we have a take home quiz. I am not savvy in physics at all, much less quantam mechanics, so any and all help is greatly appreciated. My question is: Explain what is the difference in terms of energy between the ground states of rigid rotors...

I am building an axial flux generator with dual rotor and single stator. I was doing calculations and have a magnet pole pair question i need help with, there are 12 magnets on each rotor with North pole on one rotor across from South pole on the other rotor. Since there are 24 total magnets...

Hello, I'm creating an excel file to calculate the velocity of one rotor of a helicopter, and I'm getting really weird answer, in comparison to the one a friend of my who does aerospace engineering give me. I don't do an aerospace engineering course but this is a project I've been researching...

So I was reading about asynchronous motors, and it seems the motor works better when the resistance of the rotor is smaller. This is fairly obvious, because the smaller the resistance, the bigger the inductive currents and therefore more mechanical force is applied on the rotor, thus its doing...

Hello I am making a helicopter flight simulation and I need an answer to this question: when you push the cyclic forward, does this create a torque which will rotate the helicopter. if the answer is yes, please tell me what counteracts this torque and stops the rotation when I return the...

What formula would one use to determine the centrifugal force at the tip of a rotor of 35ft diameter, rotating at 392rpm? Would any other factors be necessary, such as blade thickness, weight, etc? A pilot I work with doesn't believe the weight at the rotor tip would be measured in tons. I...

Homework Statement A rotor ride has a radius of 10 m. The ride is in its experimental phase, so the engineers have decided to use a monkey instead of a person. The mass of the monkey is 30 kg. The sides of the ride are designed so that the maximum friction riders will experience is 0.4*Fn...

Homework Statement I'm having difficulty obtaining an accurate value possibly due to unit conversions. Homework Equations r_m=mdot/(2*pi*U*N) r_m=mean radius, ft mdot=mass flow rate, lbm/s U= blade velocity, ft/s N= RPM The Attempt at a Solution I know that I have to convert Rpm...

Hello! I am creating, or at least attempting to create, a human-powered helicopter. I need an equation to figure out the lift from the rotors. I plan to use four counter-rotating rotors, three blades each, and each blade made of foam, with aluminum ribbing. The blades will be six feet each...

In a 3-phase squirrel cage induction machine, why the rotor terminals are short circuited?