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 dominant type of induction motor.

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51 views

Troubleshooting AC motor brake

I am trying to fix a brake on a mitre saw. I am yet unsure of its operating principle. The switch (shown taken apart) has one terminal on the left side with grey wire going to the motor housing, and ...
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Slip Frequency Factors In Indirect Field Oriented Control

I am attempting to configure a asynchronous motor with a IFOC drive. I have an encoder on the motor, however I have been struggling with getting the drive parameterized to operate correctly. My ...
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minimum-working example for schematic diagram of a compressor

CONTEXT My son recently noticed that the lights dimmed when the refrigerator turns on. This question has been posed elsewhere [1]. The responses in [1] do not meet my needs. In my humble opinion, ...
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Developing Sensorless FOC PMSM code from Sensored FOC ACIM

Recently I worked on a project to develop field-oriented control (FOC) for AC Induction Motor (ACIM) with Encoders giving the position feedback. Using the same algorithm, my next project is to ...
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reactive power in induction machine

Does an induction machine actually consume reactive power?
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Difference between nominal operating point and optimal operating point of induction machine

I am trying to draw Heyland drawing for an induction machine where it is said that the nominal operating point is equal to the optimal operating point. I am confused about the difference between the ...
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109 views

Can I use a Microwave Capacitor as a Motor Start Capacitor?

Recently I had a garage door opener stop working and it was replaced. I decided to take it apart and realized the capacitor had blown a hole in itself. The motor, despite being about 20yrs old, seems ...
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34 views

Motors in symmetrical fault analysis

In three phase symmetrical fault motors(Induction and Synchronous) become generators(I guess because of the inertia). When do I take in consideration of the motors? Do I even need take them in ...
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42 views

Induction from AC or RMF

I'm struggling to get my head around induction motors. Specifically, from what I can see the rotating magnetic field created by the 3 phases creates flux lines which sweep across the rotor bars which ...
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56 views

how to wire a 12 lead motor for lowest possible current draw

Im on a job where a blower motor that was a 20amp load, was replaced with a 46Amp motor. The bucket can not be replaced for a larger starter, there is no more room in the MCC. The owners do not want ...
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77 views

Microwave rotating plate

I noticed that the rotating plate of many microwave ovens usually rotates with a specific direction, even if sometimes this changes. What makes the plate rotating clockwise/counterclockwise? I know ...
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calculate rpm motor to drum roll rpm [closed]

I have a machine used the motor to drive a press roll(a small roller) that sends power to drum roll (big roller). I need speed 27 rpm for Drum roll and how many RPM for the motor that drives the ...
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double sided induction motor?

Some background to what I'm actually trying to do: I'm working on a project where I need a very smooth motion control at variable, and very low, speeds and I thought induction motors would be well ...
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Can an induction motor be used to generate power?

Induction motors do not have magnets in them, instead the magnetic field the outer coils generate creates electricity, and subsequently magnetic field, in the inner coil. This means those motors need ...
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Tradeoffs between brushed, brushless and induction motors

What are the tradeoffs associated with adopting brush-less, brushed and induction motors for designs? More specifically, if the goal is to design a servo, for example, how does the control circuitry ...
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Parameters of the 3 phase geared induction motor

I have a 3 phase geared induction motor. The name plate is below image. I couldn't find any datasheet from internet. Explain me parameters that on nameplate for entering to VFD. I need to know Rated ...
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Calculating speed of the rotor with slip

The question i'm having trouble with is: Calculate the speed of the rotor of a 6 pole induction motor with a slip of 2.2%. The motor is connected to a 230V single-phase supply. I am familiar with ...
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59 views

In 3 phase induction motor how many phase will be generated in wound type and squirrel cage rotor?

In 3 phase induction motor how many phase will be generated in wound type and squirrel cage rotor? If we consider a generator when the rotor rotates there will be voltage induced in every pole of ...
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Why does the V/Hz ratio of a motor affect the magnetic field strength?

When the frequency is increased whilst keeping the voltage constant, the magnetic field strength is going to weaken... I don't understand why and what actually happens that causes the field strength ...
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Running 3 phase asynchronous motor below nominal torque

In class we have a 3 phase asynchronous motor which says 400V delta 690V star. The nominal torque of the motor is 3,7Nm. Can the motor run safely nominal charged on 400V in star configuration? I'm ...
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How to calculate V/f value for an Induction motor?

I want to implement constant V/f in variable speed Inverter of a 3-phase Induction motor, 1500 rpm, 4-poles. I also know the equation: V/f = 4.44 × N x Phi Phi is maximum value of flux, f is ...
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385 views

Why does the Dual Speed Dahlander motor need a bridge in the fast speed configuration?

On the nameplate of the motor is a Delta/Wye-Wye configuration, meaning you supply the ones (U1, V1, W1) and leave the twos open to achieve the slow speed. And for fast speed you supply the twos and ...
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Can I use a soft switching IGBT (FGA 25n120: given in specification) for my variable frequency drive power circuit (frequency around 10-20kHz)?

I am building a variable frequency drive from scratch. The design worked well with switching MOSFET. Now I need to increase the power output and DC bus voltage so that I would like to implement ...
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How to change V and F in constant V/F control of an ACIM?

If I generate 3-Phase PWM outputs to drive a 3-phase ACIM and use constant V/F method for speed control then how will I change V and F of the generated PWM outputs? I will generate PWM's using LUT ...
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Induced EMF in electrical machines

I am currently working with machines and when I try to understand their principles in-depth, specifically in machines, I got to know that EMF is induced because of any of the two reasons: 1) Time-...
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156 views

Designing a AC Snubber circuit for 2 hp using AC snubber

I am trying to control my 2 hp 240AC single phase motor with help of an arduino. Right now it is controlled via a contactor with 220-240 AC coil input voltage with help of NO and NC switches. ...
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What terms to differentiate between a quasi-synchronous motor (eg an induction motor ) and a completely asynchronous motor (eg a universal motor)?

I am editing a table of motors. I am looking for the correct terms to distinguish two types of motors: motors whose speed is less than the AC frequency (all inductions / squirrel cage motors) from ...
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49 views

DQ frame in foc of induction motor

How to find the orientation of DQ axis of rotor and stator in induction motor using iq and Id currents? Particularly in foc of im, I have measurement of stator ia, ib, ic and rotor omega. However, ...
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Does my motor need a second capacitor?

First things first - I am a complete novice. Thank you in advance for your help. I bought a motor second hand, though it has never been used. My aim is to have it run my table saw. What I know: ...
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37 views

Split start induction run motors

I'm reading a book on split start motors where single phase ac is phase shifted by two inductors at different resistance and inductance. My question is how does this offer a 30-45 degree phase shift,...
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Swapping Park and Clark Transforms

In the 3-phase Vector Control of AC motor if we swap the order of Park and Clark transforms (as well as their inverse transforms) will we get the same result or will we get meaningless output?
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516 views

Fan speed and power consumption

Really basic question that I've struggled with for a while. In low-cost fans, a series of mechanical buttons select fan speed. I assume each button is connected to a specific resistor which limits the ...
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55 views

Wiring asynchronous motor with terminal in middle of Aux winding

EDIT: This is likely just a case of poor/wrong labeling. .41 amps x 115v = 47w, not 16.5w I have a particular motor, salvaged from an dehumidifier. It appeared to run in two speeds when part of the ...
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Understanding the failure mechanism of capacitor

Most ceiling fans and table fans designed for household use, eventually slows down before completely failing to work. By close observations I found these fans are using capacitor-split-phase motor ...
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415 views

Braking Methods of Induction Motor in VFD

As you know, we can stop an induction motor by plugging or regenerative braking. What I'd like to know is that when controlling induction motor with VFD, which braking way VFD uses? It seems to me ...
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Single phase double pole cap. start motor siezes up

Power off- motor freewheels Power on- motor runs for a few minutes then siezes up. Power off immediately- Motor freewheels. Is the capacitor shorting out internally from heat? How can I check for ...
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How is that “howling” sound produced in induction motors?

Note: No, there are no inverters involved in this question here. I've perceived that most, if not all induction motors make a "howling" sound in their coils that is different from the constant 60 Hz ...
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Question about the equivalent circuit of an induction motor

This is the given equivalent circuit for the above parameters (from the problem's solution): The resistance is R2[(1-s)/s]. However, my textbook shows that the resistance is instead R2/s for the ...
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378 views

How to Size Line Reactors and Understanding Reactor Specifications

I've got a 600 VAC, 75 HP VFD that I want to place line and load reactors in series with. Usually, I find charts like this that give me a horsepower table to follow as they are the easiest to use. ...
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139 views

Why is the rotor power factor of the induction motor lagging?

A 460-V 60-Hz four-pole Y-connected induction motor is rated at 25 hp. The equivalent circuit parameters are R1 = 0.15 Ω, R2 = 0.154 Ω, XM = 20 Ω, X1 = 0.852 Ω, and X2 = 1.066 Ω. The rotor power ...
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57 views

Induction Motor: Reason why the current locus is on the positive imaginary axis

The shown locus is of an induction motor. I was wondering if there is a reason why the imaginary current of a current locus of an induction machine is positive. Every equation contains a term like \$-...
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87 views

Electrical equivalence and Difference between Flux and Torque in AC motors

For AC motors, Synchronous and Asynchronous ones, are these two linked together or different quantities, namely magnetic flux and torque? Also if I want to measure these quantities electrically then ...
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114 views

How does DC braking stop an AC motor without considering current direction?

When a motor is coasting to standstill, if I apply a DC voltage across the windings I will brake that motor... We'll at least that's what I've read. Now here's the thing. With reverse current ...
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Why is the air gap between the stator and rotor on a motor kept as small as it is?

Between the stator windings and rotor is a small air gap. What would happen if this gap were larger than it is? Surely the magnetic field set up by energizing the stator windings would still cut the ...
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Why don't motors coupled to gearboxes spike up significantly?

A 5,5KW motor is rated 11,40A for the delta connection at 400V. This motor is coupled to a gearbox that reduces it's speed from 1440rpm to around 121rpm. On the gearbox shaft is a sprocket and chain ...
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161 views

wiring electric motor to run CW without name plate or diagram information, other than my diagram of it running CCW

Motor does not have name plate or diagram. It is running CCW rotation now. From my wiring diagram is it possible to re-wire to run CW? Thanks for your help.
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Run electric motor CW & CCW with DP-DT switch

I have a Harbor Freight drill press 1-1/2 hp, running on 120 volt, capacitor start. Is it possible to run CW & CCW rotation, using a DP-DT switch? Motor has four wires coming out of it, all ...
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Adding an additional motor to a load

You have a 500kVA load with a power factor of 0.6 lag. You add an additional synchronous motor with an input of 80kW and max power factor of 0.8 leading. Determine the reactive power and the overall ...
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61 views

Vector Control in Induction Motors

Can vector control in induction motors be considered as power factor correction ? From my researchs, it seemed to me angle between rotor and stator flux is 90 degree when load is purely resistive (...
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170 views

What is the equation for mechanical efficiency of a 3 phase induction motor?

I know that mechanical efficiency is n= power output/power input, but I don't know how to find each of those. I have to find the efficiency at full load running speed. I was only given mechanical ...

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