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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21 views

PI Speed Controller design for Direct Torque Control of 3-phase Induction Motor

The question is quite simple. Design steps for PI controller design for speed loop of DTC. Actually which equations (considering the states L and C) would come from which we design the Kp, Ki values ...
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89 views

How to make a controller for a universal washing machine motor?

I found a broken 2000ish Whirlpool washing machine called AWT4085 in a junkyard. I bought it for a school project like 'E Waste can be reused' topic. It was like 10 bucks or so. It had a lot of ...
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111 views

GFCI tripping when using hair trimmer, but only when using an extension cord

I have a GFCI socket in a recently-build bathroom. My hair trimmer trips it often when stopping under some conditions and while I have a fix I'd like to better understand what exactly is going on here....
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76 views

induction motor rotor current

I don't want a solution The solution is already given. A 575V, 60Hz, 150 hp, 0.80 power factor lagging, 2-pole, 3-phase induction motor has the following equivalent circuit parameters as seen from the ...
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33 views

Identifying the components of an electric motor

I need to calculate the magnetic field in the airgap of this electrical motor (also other things such as torque) but I'm having difficulty identifying its components (airgap, rotor and its nucleus, ...
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34 views

Difference between turns function and winding function PMSM?

What is the difference between turns function and winding function as applied in the Modified Winding Theory and how do I compute them given the parameters of a PMSM?
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79 views

Generator to run a compact industrial VFD (Sinamics V20)

I have a Siemens Sinamics V20 (0.5HP) industrial VFD (as picture), powering a 3-phase 0.25 HP electric motor. I work in the field and generator is the only way to have electric power. I am looking for ...
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55 views

How to design PI controller for the field weakening control of the three phase induction motor?

In the book called Electric Motor Control in the Chapter 8 I have found following field weakening strategy for the three phase induction motor The aforementioned field weakening strategy is based on ...
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130 views

MOSFET burns - 220V inverter for induction motor speed control using Arduino

I have been working for quite some time on my project to control the speed of a 220 V, 60 Hz, 0.35 A induction motor (domestic fan). I use an Arduino to generate 60 Hz with a switching frequency of 10 ...
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67 views

Phase angle difference between the induced EMF in the rotor and the rotating magnetic field in three phase induction motor

I have been studying the three phase induction motor and in the process I could not exactly understand the EMF generation in the rotor. From figure(2) below, it is understood that the maximum EMF is ...
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74 views

Motor run capacitor tolerance

From wikipedia: If a wrong capacitance value is installed, it will cause an uneven magnetic field around the rotor. This causes the rotor to hesitate at the uneven spots, resulting in irregular ...
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76 views

Problem with solid state relay and ac motor

I installed a circuit to automatically start a dust extractor when I turn on one of my woodworking machines. I have one 230V circuit dedicated to powering the machines and another circuit powering the ...
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72 views

Three phase induction motor connected in single phase power system

I'm trying to figure out an experiment in a lab that we did with a three phase motor connected in a single phase power supply. The schematic is as below: I measured all currents in the motor windings,...
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54 views

3 phase electric motor torque output

I am a mechanical engineer and fairly new to real life usage of electric motors. I have a 2.2 kW 3 phase AC motor. At 1450 rpm, it can generate 14.49 Nm torque (I understand this is called nominal ...
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75 views

Can someone verify my understanding of induction motors?

Here's my understanding of the induction motor, it would be really helpful if someone can verify it. 3 phase AC supply given to stator, sets up an rotating magnetic field (RMF,) \$ B \$ (discussing ...
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1answer
43 views

Oversized electrical motor, synchronous, vs asynchronous

I know that a oversized motor would consume more energy than a well sized one, and in a low load scenario it will present a lower power factor than a well-sized one too. My question is, what is the ...
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How do I size conductors to a three-phase induction motor to account for voltage drop?

Suppose I have a 480-volt nominal electrical distribution system, and a 460-volt nominal motor. Assuming +-5% variation in the source, it could get down to 456 VAC. I've seen references to motors ...
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Exciting the rotor and stator of a slip ring induction motor at different frequencies, will it develope torque?

I came across this question as I was preparing for an exam, I am unable to understand the theory behind it. The textbook says the motor can run a 600 and 2400 rpm but gives no explanation. Could ...
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Space vector pulse width modulation

I have implemented space vector PWM for a three-phase induction motor. For the further control scheme, I require to get information of active vectors(V0, V1, V2, V3, V4,....V7) getting switched in a ...
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66 views

How to transform the state space model of the induction motor?

First of all I would like to apologize if I have chosen wrong forum. My question is related to the electrical engineering but basically it is a mathematical problem. I have the state space model of ...
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5answers
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Would retro-fitting a DC motor as the blower motor in a residential furnace be more efficient than existing 1/2 hp AC motor?

There exists DC motors of various voltages (12, 24, 48, etc) and various powers (1/2 hp, 1 hp, etc). They seem to have the necessary power and RPM to operate the blower in a conventional residential ...
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144 views

Controlling the speed of a single phase 4-pole induction motor

I have a Crompton Greaves single phase induction motor that powers my drill press (image below). I believe it’s rated at 1/2HP. I wanted to control the speed of this motor so that I can use the drill ...
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227 views

Is there non conductive solder?

I am making a project in my university and I really need to find a way to glue back together two blocks of the stator (part of an electric motor). As you probably know the sator is composed of sheets ...
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41 views

Why can't we increase diameter of induction motors as we can do in axial flux motors?

Axial flux motors have high torque to weight ratio. One of the reason is that it has larger diameter. which means since T=F*r . if r-->radius increases torque increases. More specifically I read it ...
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399 views

Benefits of using a sine wave filter with variable frequency drive

Sometimes sine wave filters are installed on the output side of a variable frequency drive (VFD.) My understanding is that these filters are advised in situations where there may be capacitance among ...
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119 views

Why does the rotor magnetic field lag the rotor current by 90° in a 3 phase induction motor?

I was trying to understand load angle in electrical machines, generally denoted by delta, and I found out that while delta needs to be less than 90° in synchronous machine for steady state stability, ...
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45 views

Induction motor breakdown power

The question and the answer is: However, I think there is a mistake. Below is my solution: Since ZRotor = 0.3 + j0.35 Ω R2/s = 0.3 Ω from the below equation, the maximum slip can be found: s = 0.474 ...
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29 views

Low load rotor copper losses versus full load rotor copper losses

i made a table to try to understand why an induction motor copper losses increase with an increase in the rotor slip resistance. For the sake of understanding I ignored the copper winding resistance. ...
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1answer
135 views

How does starting torque increase by increasing rotor resistance?

As the formula below shows that the torque is both directly and inversely proportional to the rotor resistance. However, since it's inversely proportional to the square of the resistance, it is the ...
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1answer
44 views

Split range control structure for the inverter

I have been working on the grid forming inverter control. I have started with the cascaded voltage and current control loop i.e. control structure like that As far as I understand correctly this ...
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2answers
56 views

Induction motor highest real power condition

The question: The answer: I am confused isn't peak power is at peak torque i.e. breakdown torque? Which is at just above 0 RPM? Source: NCEES PE Electrical and Computer: Power Practice Exam, 2020 ...
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54 views

Induction motor with reversing stator magnetic field

The question: The answer: The strength of the torque depends on the difference in speed between the stator's rotating magnetic field and the rotor's rotation. The larger the difference in speed the ...
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1answer
40 views

when does induction machine supply capacitive power

Can an induction machine whether it being a motor or a generator supply capacitive reactive power?
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2answers
75 views

Grid forming inverter control

I have been working on a project where the three phase voltage source inverter has to be controlled in so called grid forming mode of operation i.e. the inverter creates three phase grid of fixed ...
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1answer
60 views

Can I lower speed on 1/4 HP PSC fan motor by lowering the input voltage without harming motor?

I have pics of the motor label. This motor now has three speed settings: low, medium and high. I have pictures of the control as well.
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91 views

How can I identify this single phase AC induction motor?

I have an AC motor with 7 different wires connecting to it, and I'd like to identify how the windings are configured. The wires are: Red Orange Yellow Blue Black White Yellow+Green What I've been ...
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15 views

Simulation of DFIG input voltage to stator

I'm currently looking into the modelling of a DFIG in simulink (however I have seen models in other programs as well) and I'm slightly confused as to why there is a 3-phase voltage input to the stator ...
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53 views

What does referred to mean in induction motors?

What does the term referred to mean? And how if it's a stator reactance it still says referred to stator?
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Using servo motor as load to induction motor

I have an application where I have a 3hp induction motor that spins at 1755 rpm (1800rpm is the synchronous speed). A servo-motor is connected to the shaft of the induction motor, and is supposed to ...
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34 views

3D FEM Vector Potential Formulation Formulation

Most freely available FEM analysis software for induction machines seem to only be able to simulate 2D machines without circuit coupling. I have attempted to formulate the problem of a capacitor run ...
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76 views

Current with 150 degree phase shift and wiggle on single phase motor

So while I was trying to solve another problem on a different question, I found that my AC(Air Conditioner) Unit compressor waveforms were a bit confusing; As you can see on the scope view below there'...
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107 views

Induction Motor Coil Series or Parallel?

Induction motors always have multiple slots per pole per phase. From what I've seen in the literature is that most if not all motors have these multiple coils in series, and not in parallek. Why is ...
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57 views

What is the effect of stator magnetic flux on the rotor of Synchronous motor?

I get that the stator is fed 3 phase supply and the rotor is fed a dc supply. And it reaches a stage where the constant flux by dc current in rotor and the rotating magnetic flux by ac current in the ...
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47 views

Power-on Timer Delay for Induction Motor

I'm designing a circuit for a power-on delay that powers a centrifugal water pump. When the power is switched on, it needs to be delayed by 60s before starting up the electric pump. The power source ...
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97 views

Connecting a three phase electric motor to a single phase power supply

I would like to know what the cheapest and easiest way to connect a three phase 2.2kW AC induction motor to a single phase 230V power supply is. Also, in this setup, how can the motor be started and ...
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64 views

Table jitter on 40 ft planer mill at certain low feedrates with new 40 hp 3-phase motor and 50 hp ABB drive

The display on the drive shows 26 amps with little variation at all speeds. At 176.14 RPM it shows -9.2% motor torque, 25.63 amps. At 977 RPM it shows 26.04 amps and 2.4% torque. The motor spec ...
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85 views

Somfy WT motor must not be driven by a solid-state relay or triac relay?

I came across this line in the installation / operating guidelines of a comfy (blinds) motor: The drive must not be driven by a solid-state relay or triac relay. Would there be any technical reason ...
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68 views

Induction motor 'droop control' on multi-motor coupled loads

When using droop control to balance the torque across multiple motors driving a coupled mechanical load such as a chain conveyor, what is the actual variable that is being altered by each drive? From ...
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48 views

Voltage spike on relay switching ON

I has readed the short article about relay & inductive load. It has a case, what i cant understand. Prereq: Load - motor, around 3kW. No snubber. When relay switched ON - huge voltage spike has ...
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185 views

Speed control of single phase shaded pole induction motor

I have a group project where I have to control the speed of a single-phase shaded pole induction motor. My plan was to use a Triac-based circuit however, all Triac circuits I have seen use a ...

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