Induction motor Definition and 131 Threads

I need to create graphs of: 3 Phase Torque vs RPM Current vs RPM Mechanical Power (HP) vs RPM Efficiency vs RPM Power Factor vs RPM for Slip between nearly 0 and 1 for a 5HP, 60 hz, 440Vac, 4 pole, 3 phase induction motor. I'm having trouble finding equations online relating...

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

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?

Hello! I wanted to know if it is possible to calculate the rotor slip if I know the output torque and rpm shaft. I also know the equivalent cicuit of the motor: Rs, Rr, Ls, Lm and Lr. Thank you!

[FONT="Verdana"]What happens if an big AC induction motor is running with full load an your suddenly reverse the 3 phase?

What will happen if an ac inductions motor is running, an suddenly an error occurs in the voltage pr. hertz motor control so the stator frequency goes down below the rotor frequency for 1-2 sec?

Hello, I have come to this forum as I don't believe what i am being taught to be entirley accurate and need some clarity on a question (not an exact answer, this is not homework) To begin, I believe the person 'teaching' my subject is not up to standard as when our final topic of three...

NOTE: This is not a homework problem. This semester we dealt with AC motors both three phase and single phase. Now I know that 3 phase system is associated with constant power and therefore a constant power is being fed into that motor (and hence converted into constant mechanical power)...

After a refresher about basic principle of Induction motor, I realized that the torque developed by induction motor is \tau = P{gap}_ / \omega{s}_ Where P{gap}_ is amount of power crossing air gap from the stator to the rotor. In case of wound rotor motors, starting torque can be...

Homework Statement A three phase, 6-pole, \Delta connected induction motor is rated 208V, 60Hz. It has R_R\,=\,5.2\,\Omega, R_S\,=\,2.2\,\Omega, X_m\,=\,220\,\Omega, X_{lr}\,=\,7.5\,\Omega, X_{ls}\,=\,2.3\,\Omega. Calculate the starting torque and both phase and line currents when the motor...

I have a question on induction motor starting direction. I understand the phase delay between the running winding and starting winding, but I don’t see why an induction motor should start in the same direction each time. Is there a directional bias on the stator or rotor coils that ensures the...

Hello friends Synchronous speed = 120f/p p is number of pole pairs OK So in my country 50hz 3- phase source is provided so that I can only archived 3000 rpm speed by 2 pole induction motor… how I can archived more then 3000Rpm ( Is that possible or not ) if yes then how ? thanks

What are the factors that affect how much current is drawn into an AC induction motor? I don't understand how a motor draws more current to start. I get why it would need more to start but I don't get why it would draw current into itself automatically. It may not work like that at all! But I...

Hi folks, I'm new to both the forums and the concept of inverters. For my project, I've been told to look up various inverter topologies. I've read inverters in a textbook, course notes, over the web, with PLECS, and I'm still confused. Maybe, I just need a good place to start. I...

In speed control of a induction motor, why E/f or V/f control is employed mostly rather than variable frequency control? I've read few books on this topic but still I feel ambiguous. Please can anyone come up with clear explanation.

Homework Statement The rotor of a 3 phase 60hz 8-pole induction motor takes 220w @ 3hz. Find the rotor speed and the rotor copper losses. 2. The attempt at a solution I have found the rotor speed by using the equation slipspeed = fr(120)/P = 3hz(120)/8 = 45 rpm then finding nsync by...

if the motor is already running at a voltage of 410V what would the effects be of reducing the voltage?

Hello to all, I'm a student of electrical engineering. We have learned the basics about AC induction motors and we learned that single phase motor cannot start by itself. There must be some additional part that will produce phase lead or lag in order to create rotational magnetic field. That...

hello i v got a small question about induction motors why does the steady state torqe is equal to zero when rotor speed is equal to 314 rad/s? and why when rotor speed is for example is equal to 100 , torque maintain a higher positive value many thanks

I want to know that is the direction of a single phase or three phase ac induction motor is fixed and it is clockwise? ...or it may be both anti-clockwise and clockwise..or it can be both directional for single phase and only clockwise directional for 3 phase?...thanks

I found a step induction motor in a printer and I want to find out how electricity it puts out and at what speed it is spun.

Hi, :smile: Of late, I’m dabbling with flux variation patterns in an induction motor at ‘no-load’, ‘full-load’ and ‘standstill (locked rotor)’ conditions. The concept I’m following is that an induction motor can be considered as a generalized transformer. The equivalent circuit depicts that...

Hello, If I have two induction motors, both rated power are 200KW. One is based on 400V input, and another is 1KV input. Which one will be more cost effective? How much the cost difference could be? Thanks.

If I have an induction motor connected to a fixed frequency supply then it is essentially a constand speed drive. How can I control the speed of such a machine?

I have got an 1HP induction motor rated at 230V(line), 60Hz. If I run it at 185V(line) at 65Hz, what factors are affected in its performance? I am hoping for your expert advices..

Experimenting with building a wind turbine and I'm trying to find a suitable motor. I got this induction motor out of a washing machine and have hooked it up through a bridge rectifier and a smoothing capacitor. Spinning the motor shaft by hand (a crude way of modeling how fast the wind...

I am planning an EV conversion and have been looking at different motor options that would be feasible to use. One possibility that i have been investigating is using a standard industrial motor. The main limitation encountered with these motors are the weight and the rated rpm and hp. On...

How is the direction of rotation of rotor of a 3 phase induction motor determined? Assume the rotor to be squirrel cage or any other type of rotor. I was able to reason this out, but couldn't actually write it on a paper since my explanation lacked the physics... (it was based on simple...

hello everyone my graduate project is 10-hp 3-phase induction motor can anyone teel me where to buy parts (stators,rotors,frames...etc) from USA or any other i need the company (or shop) site so i choose the required one for my design specification something like digikey for electronic...

I am trying to do a project on electrical engineering which involves design of electrical circuitry for a soot blower arrangement.i am having problems in designing a motor( 3phase induction motor). i know how to calculate the rotor parameters,losses, efficiency,etc. i am told that i have to find...

hi all (hopefully friendly) people... In my year 12 physics class, i have been given a report on AC induction motors to complete. Basically the requirement is the explain the physics behind it, how it works, why, etc Can someone give me a list of things that i should cover as i am...