Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [induction-motor]

Induction motors are alternating current motors with rotors that are energized by induction. They are available with power ratings ranging from about 1/500 Hp (1.5 W) to 30,000 Hp (22MW). They are the dominant type of AC motor used in most of that power range. Squirrel-cage motors are, by far, the ...

0
votes
2answers
51 views

Wire old 240 Vinduction motor for 120 V

I have a working motor taken from an old dryer. The motor plate says it runs on 120 V AC, but a separate housing on the motor for the connections indicates it runs on 240 V AC. When I opened the ...
0
votes
0answers
34 views

Convert a startup circuit of a motor of 185 KW [on hold]

I want to convert a motor (old one) (with rotor resistor (electrolyte) start up of 185 KW to another motor with star delta motor (squire cage) with the same power and same force in start up any one ...
-1
votes
1answer
23 views

How to determine direction of induction current (I inc) according to V emf?

In this question, I easily understand the solution. But I want to determine the direction of induction current (I inc) with the Lenz Law. I know how works Lenz Law, but I couldn't determine the ...
0
votes
0answers
13 views

Dividing the rotor circuit by slip in induction motor

In this article equation (3), just after figure 5, they divided everything in the equation for current by slip. I understand that current remains the same when doing this, but voltage and power would ...
-1
votes
0answers
19 views

DC link capacitor for induction motor drive

I am simulating FOC drive for a 5kW,400V 3-phase induction motor. The drive algorithm worked fine when inverter was fed from proper DC source of suitable value. However, in practice, the drive has to ...
1
vote
2answers
54 views

Modelling 3-phase induction motor and filter for inverter output in LTspice

I am designing an inverter in Ltspice and am looking to have a simple circuit to represent the motor load and filter out the PWM harmonics in order to obtain outputs. The motor characteristics are: ...
1
vote
2answers
59 views

What will happen if we use an Inductor in place of a Capacitor in Single phase Induction motor

So as the titles says, well i know that a capacitor give phase shift and that results in a rotating Magnetic Field. So i was wondering what will happen if we use a an inductor, i mean doesn't it ...
1
vote
3answers
33 views

Externally excited induction generator

I read a statement in my textbook-" The short circuit current of the externally-excited 3phase induction generator is limited" which I am unable to understand. Kindly help
0
votes
3answers
63 views

induction motor stability

Does the change in slip (s) have any impact on load torque in an induction machine/motor? I know it affects the motoring torque. But do the load torque also get affected by the slightest measures if ...
0
votes
0answers
29 views

Parallel Triac driving same Inductive Load NOT Working?

As per the schematic two same value triacs and driver circuits are connected parallel, Triacs are BTA24 and Opto-couplers are moc3021 and the load is inductive, when i trigger the MOC U1 the Triac Q1 ...
0
votes
1answer
45 views

how to design AC line filter for VFD?

I am working on VFD for single phase induction motor. I am rectifying AC 220V directly to DC link capacitor. There is no LC filter from AC mains. There are harmonics in the AC mains. Can you suggest ...
0
votes
1answer
48 views

Why do we divide by slip in the Rotor equivalent circuit for an Induction motor?

I was reading this article and everything made sense until the equivilant circuit for the rotor was divided by the slip s. I understand that the current in the circuit would remain the same, but it ...
53
votes
3answers
7k views

Fan speed switch: why OFF :: HIGH :: MED :: LOW?

Many AC fans, including inexpensive floor models, have a rotary speed control which rotates from OFF to HIGH to MED to LOW. Since the switch does not rotate 360°, you have to rotate it backwards to ...
0
votes
1answer
70 views

Why even when we increase the synchronous speed, the slip still remains it's value? [closed]

This is an induction motor question: why even when we increase the synchronous speed, the slip still remains it's value?
0
votes
1answer
20 views

Can a DFIG operate in a synchronous speed?

A DFIG can operate in both sub and super synchronous modes. Can a DFIG also operate (stable) in a synchronous speed? If so, would the rotor current (as decided by IGBT switching) be DC since the rotor ...
0
votes
1answer
37 views

Reactive Power in grid side converter for Doubly fed induction generator

Does the grid side converter in a DFIG absorb/provide reactive power or is it reactive neutral? Also, what can we say about reactive power exchange in the rotor side converter?
0
votes
1answer
34 views

What are the d and q axes for induction machine?

What are the d and q axes for an induction machine (physical meaning)? I understand them for a synchronous machine but how are they defined for an IM?
0
votes
0answers
35 views

Is using an external capacitor in a slip ring induction motor viable for increasing it's starting torque?

I've been reading about slip ring induction motors lately and several sources, including Wikipedia and LearnEngineering (a YouTube channel), mention that adding an external resistance will increase ...
0
votes
2answers
63 views

Filter harmonics in AC power line [closed]

I run a Toshiba Digital copier machine in my shop and the machine started showing error codes related to power issues a few days ago. This happens randomly during daytime. There were no problems at ...
1
vote
2answers
67 views

Induction motor wiring

I took this motor out of a drier and want to run it. I'm a newbie. It has 3 wires Yellow: connected to the capacitor. Brown: connected to the capacitor other end. Black: not connected to anything. ...
0
votes
1answer
129 views

Does the motor speed change with the fully automatic star(wye)/delta starter?

At no load, I connected a 380V motor to start in the star connection for 5 seconds and thereafter change to the delta connection. I understand that torque will change since the current will change as ...
1
vote
2answers
64 views

Can someone confirm how to wire this air pump?

I am trying my first 'electronics' project, involving setting up a pond aerator pump. I purchased a Gast air pump, 86R123-101-N170X. However, it came just as it was assembled at the factory and does ...
2
votes
1answer
102 views

Working of a Doubly-Fed Induction generator (DFIG) in wind turbines

I am unable to understand how a Doubly-Fed Induction generator works (in Wind Energy conversion system)? I do not understand how the reactive power fed into the stator interacts with the rotor so as ...
0
votes
1answer
43 views

How should I connect the windings of this induction motor to make it work?

I took this motor from an old washing machine and I'd like to make it work. The motor has the following specifications: Input voltage: 220 V 50 Hz Number of poles: 2/12 RPM: 420/2820 Rated power: 0....
0
votes
1answer
46 views

why isolate the run capacitor from circuit when off?

Back in 8/24/2016 Charles Cowie answered a question regarding a bidirectional AC motor with hand sketches. At the top left corner, the run capacitor for a motor with 2 stator windings seems to "always ...
0
votes
0answers
33 views

Meaning of these terms - Simulation of vector control (FOC) of induction motor?

I'm having hard time doing simulation of vector control for 3 phase asynchronous machine. I was studying MATLAB - Simulink simulations available already on MathWorks site but I couldn't understand ...
0
votes
1answer
330 views

How does carrier frequency and pulse width modulation in a VFD work together to control AC motor speed?

There is a lot of online information about this but there is also a lot of contradictory information. What is carrier frequency exactly and does it stay the same or does it vary? I understand the ...
0
votes
1answer
217 views

Wiring washing machine motor

first apologize for wrong wording/idioms. Found an old washing machine motor. It has six terminals, labeled U, V, W, Z, X, Y Attached to the motor is a capacitor with two terminals, no more wires ...
0
votes
1answer
34 views

Long vs Short Earth Connection for Single Phase Motor vs 3 Phase Motor Frame

What is the correct way of grounding single phase motor frame if I have to choose between two options: (1) Short to earth connection: from the frame to nearest grounding rod. See below the schematic....
0
votes
1answer
35 views

How to determine the right trip point of thermal cutoff for 1/4 hp 3A 115V single phase ac motor

The Thermal fuse blew in my Ryobi DP102L drill press motor, while I was drum sanding. There were no markings on the fuse. The single phase induction motor is 1/4hp 3A (no load) 1750rpm on 115V AC, ...
0
votes
2answers
163 views

What is the recommended way for starting an ac induction motor with a VFD?

I am designing a control strategy for an AC(induction) 3-phase motor fan in an HVAC air handling unit for pressure control inside the ductwork. The plan is to use a PID algorithm for the pressure ...
0
votes
1answer
54 views

AC blower with run capacitor sometimes does not start up

I installed an AC blower motor into a cabinet to act as a ventilator for some electronics. Thankfully it has a wiring label. Based on the label, it must be a run capacitor induction motor. It ...
0
votes
0answers
19 views

Problems in simulating current model flux observer

I want to estimate rotor flux in 3 phase induction machine using Blaschke's equations. Here's the current model I'm suppose to simulate.:. I have to simulate this thing, I successfully obtained iqss ...
0
votes
2answers
89 views

What is the function of the dippers in a slip ring liquid starter?

The liquid starter is one that uses a washing soda solution and water in a tank. From what I've read, the dippers are attached to a shaft controlled by a small motor to lower the dippers into the ...
1
vote
4answers
162 views

Induction Motor Torque Slip Characteristics

This question was asked in a interview for Scientist position. For a given T-slip characteristics of an induction motor, I want the same maximum torque but at a lower slip value? Is it even possible?...
1
vote
1answer
43 views

Why the rotor core losses are very tiny compared to the stator core losses in an induction motor?

Book says rotor mostly runs at speed near to synchronous due to which the relative velocity between rotor and stator magnetic field is very less. Correspondingly making rotor core losses tiny and ...
2
votes
2answers
109 views

Current waveform electric motor

Does electric motor reactance at given speed is constant according to rotor position (angle)? For switched reluctance it is not. But for three phase induction motor? Considering there is no any noise....
1
vote
2answers
377 views

Induction Motor Starting Problems

First off I'll start by saying that I have almost no experience of single phase induction motors but I do have a reasonable knowledge of electrical & electronic stuff. My neighbour asked me to ...
1
vote
1answer
121 views

What causes horsepower and torque to remain the same in a dual speed (single winding) motor?

Below is an extract that I've found but don't fully understand... What actually causes the horsepower to be the same at both speed? And for the second scenario, what causes the torque to remain the ...
1
vote
1answer
38 views

Induction motor construction

What will happen if rotor diameter is increased in an induction motor? How the torque changes ? How the performance will change? How the pf will change ? What will be the disadvantages? This was ...
0
votes
3answers
224 views

Why rotor copper loss in induction motor doesn't change with slip

Why air gap power is consumed in R2/s but rotor copper power loss only in R2? Transformer Equivalent circuit of Induction motor: ...
-1
votes
2answers
210 views

why i hear sound in fan? [closed]

I have a table fan which runs on 220v ac mains when we power the fan it works normally, but when power cuts off(frequently occurs in India), then the ups inverter supplies the power, then the fan ...
0
votes
1answer
58 views

For induction motors, would one expect harmonics to be different between Delta and Y stator windings?

Given two induction motors with the only difference being that one is wound delta, the other Y, would I expect to see a different behavior if the source is a three phase voltage with harmonics?
0
votes
3answers
744 views

How do I calculate the number of rotor and stator poles in AC motor?

I just started studying AC motors and I found myself in some trouble here. Basically the exercise asks me to calculate the number of rotor and stator poles in an AC motor, given the nameplate data. ...
-1
votes
2answers
146 views

Why is the torque vs slip speed characteristic of an induction motor costant with respect to the frequency of the voltages applied?

I'm currently studying the induction motor and I have some troubles to understand which causes this thing. Let $$w_2 = w_1 - w_r$$ be the slip velocity and $$s = w_2 / w_1$$ be the slip, where w_1 is ...
0
votes
1answer
46 views

power losses induction machine

I am totally lost in a question, how can be derived the friction losses of a induction machine based on this equation (It wasn’t given explication about these nor the bibliography/source of this ...
7
votes
4answers
2k views

Why is slip necessary in an Induction motor?

Why should the rotor of a 3-phase induction motor not rotate at synchronous speed?
0
votes
2answers
221 views

Why does the Slipring Motor speed increase with a decrease in resistance?

With induction motors, we know that the speed depends on the number of poles and also the supply frequency. Now, the slipring motor is also an induction motor and should follow the same principles, ...
0
votes
1answer
287 views

Need help reversing the rotation my motor

I'm pretty new at this. I was able to salvage the motor of a washing machine. How will I know if I can reverse the rotation of it? And how will I be able to reverse it if it does? Also how will I ...
0
votes
3answers
88 views

induction machines above 500 hp?

I have been told in classroom that there are several methods (one-step autotransformer, the star-delta connection and a solid state controler) to start a induction machine above 500 hp, but what I was ...