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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34 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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35 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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28 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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52 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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62 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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77 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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1answer
31 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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43 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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125 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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Coil winding direction

I am having trouble understanding this winding schematic from the book "Induction Machines Handbook" by Boldea, Nasar. This is a winding schematic of a capacitor run single phase induction ...
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3answers
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Induction Motor Wire Size

Capacitor Run Single Phase Induction Motor have very high starting currents, possibly in the order of 35-40 Amps upon startup for a 1 hp device, whereas the nominal current usually lies in the order ...
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1answer
26 views

SPIM Rated Torque

What determines the rated torque of an induction motor? Is it purely limited to max continuous current adherent to heat dissipation requirements, or is there more to it? From what I understand, motors ...
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Why does peak torque increase on increasing air gap in induction motor?

I have been trying for a while to summarize the effects of increasing air gap in an induction motor with constant load. I understand that increasing air gap with constant supply voltage demands high ...
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29 views

Winding Factor in Single Phase Induction Motors

How does one compute the winding factor in a Single Phase Induction Motor? I have checked Wikipedia, but it only states the relevant formulae for three-phase machines with no explanation of the theory....
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50kW-100kW motor: BLDC or induction and why? [closed]

My friend and I are doing a sort of academic research about heavy electric vehicles. A sub-project involves choosing the wheel motor and defining the control method. Aside from what currently exists ...
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1answer
184 views

Motor Driver keeps dying/frying driving a worm gear motor

I am looking for some consultation about controlling a24VDC worm gear moto. I have blown 4 h bridge motor drivers thus far and while I have been trying to keep my project price tag low I may need to ...
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2answers
69 views

Squirrel Cage Rotor

Why are Squirrel Cage rotors used in induction motors, as opposed to just a solid conductive cylindrical shell? As far as I understand, a solid cylindrical shell (with solid metal endcaps) should work ...
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37 views

Effect of bandwidth of stator winding in induction motor

The stator in squirrel cage induction motors is an RL circuit with 3db attenuation $$ \frac{R}{2\pi L}Hz $$ Does that mean an IM designed for 60Hz should also have the stator bandwidth at least 60Hz? ...
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47 views

Torque RPM Characteristics of Single Phase Induction Motor within Maxwell's Equations

A single phase induction motor is constructed of a stator, which contains the stationary main winding, and a rotor, which is a conductive cage which rotates. The stationary main winding is a two pole ...
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27 views

Geometrical Parameters of Induction Motors

How does one relate the Thevenin equivalent circuit parameters of an induction motor to the physical geometry of the motor? I am particularly looking for the transient torque of a single phase ...
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1answer
58 views

is it safe/practical to control this 30A+ motor with mosfet?

I'm thinking of controlling a few high ampere water pumps from microchips. the current draws of motors will be around 38A (single phase 220V motors). is it safe to use a MOSFET (IPW60R070C6 from ...
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1answer
105 views

single phase AC motor not starting with random SSR (blind control) when all wires are connected

I'm using 2 AQG22205 (see datasheet) to control my blinds. I can let the blinds go down when the up wire isn't connected and vice versa. But as soon as I connect both wires, the blinds won't move. I ...
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1answer
41 views

Pole counts for VFD driven induction motor

What is the significance of pole count of IM if it is driven by a VFD? If we are using the power supply frequency (50Hz or 60Hz), the pole counts matter in terms of torque and synchronous speed. But ...
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How to use SPWM with reference voltage waveforms

I'm doing a simulation for an IM drive in MATLAB/Simulink and Plecs(Blockset). My model is a closed loop system and I generate the reference voltage to be applied across the motor. Now I need to ...
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42 views

Single Phase Induction Motor Working Principle [duplicate]

It is often said that the main stator winding of a single phase induction motor provides zero torque, if so what is its function? How does it help in keeping the rotor rotating? How could one using ...
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1answer
61 views

Why am I getting incorrect results via DC test performed in Matlab/Simulink?

I am performing DC test in Simulink to find the stator resistance. The three phase SCIM parameters are taken as: The setup in the Simulink is shown below: The %error is too much (25%). Can anyone ...
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1answer
95 views

How to find rated current of a three phase induction motor

How to find the value of full load rated current and rated current for a three phase motor having its ratings as: ...
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33 views

What device has high inductance? For example >1000mH (for 220Vrms 50-60Hz output) [duplicate]

What devices have high inductance values (for example >1000mH?) What I found in a real device (for example induction motor) datasheet is just near <1000mH (on rotor and stator.) Is there ...
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2answers
108 views

In absence of leakage, what creates the angle between stator and rotor flux in an induction machine?

As per my understanding to produce torque from a machine, we need an angle between stator and rotor flux. In an induction machine rotor flux is created in response to stator flux, why is there an ...
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1answer
128 views

Wiring 240 V single-phase AC induction motor to enable operation forward and reverse on a 2-post ramp pulley system

I installed a single phase motor on a car ramp. I need the motor to operate forward and reverse, so the ramp goes up or down. I understand this is possible with the use of two contactors. I need the ...
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1answer
43 views

Can a repulsion motor be connected like a series or shunt DC motor?

Recently I bought an old repulsion-start induction-run motor made by Asincron in Argentina, exactly identical to the one in this video. I can't find much documentation and information about how ...
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1answer
47 views

How to wire up a PSC motor from a air conditioning unit? [closed]

[ I hope someone can help with this. I have a LG air conditioning compressor motor. (PSC type motor). It has three terminals not labelled. Its new but came without a wiring diagram. I've searched the ...
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1answer
112 views

Why do some motors have both 50Hz and 60Hz on their nameplate, and some do not?

I have seen some induction motors have information on their nameplate listed for 50hz and 60hz. While I've read a requirement that the Voltage/Frequency ratio be consistent, using these nameplate ...
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965 views

Can I run a VFD off a generator?

I want to power a three-phase 5hp well pump with a VFD. I want the VFD both to serve as a soft start, and to allow variable speed operation of the motor. Two different pump salesmen have told me that ...
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47 views

Why does reciprocating compressor's motor starting winding have high voltage than running winding

I want to know why the starting winding of (2 ton) reciprocating compressor's motor have high voltage than running winding? I have attached the voltage that I have captured from oscilloscope. This ...
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1answer
74 views

What is the relationship between the RPM, power, and impedance of an induction motor?

Does an induction motor draw more power at higher RPM? Increasing the frequency of the AC power supply will increase the RPM of the induction motor. However, that should also increase its impedance (...
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1answer
36 views

Building a VFD for a split phase (capacitor run) motor?

I'd like to get variable speed on a very tiny lathe (Taig, 4" swing). I've got a dishwasher motor I'm planning on using for it, which is rated for 3600rpm at 60Hz (it's about 1/5HP). But it's a ...
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24 views

How to implement diagnostic switching of power transistors in the three phase voltage source inverter?

I have been developing a control software for the three phase voltage source inverter. For diagnostic purposes I would like to include a special operating mode of the control software in which I can ...
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1answer
52 views

Three phase Induction motor directions

What are the directions of the rotor conductor, stator magnetic field, and rotor magnetic field? DOo they all have the same direction of rotation? How are they related to each other? Is the relative ...
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1answer
107 views

How to solve AC fan induction motor jammed possibly due to magnetic locking/cogging?

I have a single phase ac fan motor (from a regular household stand fan) which operates on 240V 50Hz power source. It has a start capacitor. The problem I am facing is the motor is not spinning or ...
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26 views

Is V/F maintained constant even in field oriented control or vector control drive of PMSM motors?

I understand that in scalar control V/F is maintained constant below rated speed, as Vector control drive is also a variable frequency drive, I would like to know whether V/F is maintained constant ...
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1answer
66 views

Why does wound rotor IM have the belt leakage but the squirrel cage rotor does not?

According to the description on page 159 of Prof. Lipo's book "Introduction to the AC Machine design": It is important to mention that the harmonic leakage is important only for wound rotor ...
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51 views

Motor vector control and parameters estimation

Vector control methods require good estimation of magnetic flux. In Direct Torque Control it would vector of stator flux. In order to estimate it properly one has to know motor parameters such as ...
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1answer
45 views

Relation between speed and torque

I am a bit confused of The relation betweeen the parameters mentioned above. According to the below formula, speed is inversely proportional to Torque as: T=HPx9549/Rpm But i have been taught in my ...
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4answers
60 views

Speed control using VFD of three phase motor

what happens to Torque, HP, current and voltage when we increase Speed of three phase induction motor using a VFD?
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2answers
169 views

Debugging burned out TRIAC for vacuum cleaner motor speed control (inductive load)

I have tried to use speed control for vacuum cleaner like below (2000W): I have tried this circuit with two different control methods for the TRIAC (BTA24 -24A): Arduino base by MOC3063 DIAC for ...
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3answers
112 views

Controlling AC Motor with Relays

How can one control on/off and direction for a single phase reversing AC motor using relays? I have wired an AC motor correctly with 5 wires: green (ground), red (live), black (neutral), blue (coil 1),...
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33 views

Motor Mechanical Torque vs Motor Electrical Power

Let us say there is a constant load which is driven by a geared 3-phase ACIM (AC Induction Motor) of 5kW power rating. The mechanical load and its speed is constant. If I would need to replace this ...
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1answer
52 views

VFD and motor compatibility

I am looking for a VFD. The motor has following specifications:Motor nameplate YE2-1329-4 and JB/T11707-2013 5.5 kW, 400V, Δ, 11.3 A , 50Hz, CosΘ 0.82, IP 55, 1460 rpm, 87.7. Is above motor ...
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64 views

Induced voltage in the rotor of the induction motor

Given that the resultant mmf wave in the air gap of the three phase two pole induction motor is $$F(\theta , t) = \frac{3}{2}NI_m \cos(\omega t - \theta) \tag{1}$$ what's the value of the induced ...

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