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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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2 pole single phase induction motor appears to have starting capacitor permanently connected (no centrifugal switch)

I am trying to repair and rewire an AC induction motor from a small compressor. From what I can tell it's a 24 slot, 2 pole single phase induction motor that has main coil and starting coil. The ...
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57 views

Why use many-pole motor for high speed?

I found in this teardown analysis of the Nissan Leaf drive motor that it runs up to about 10,000 RPM but is an 8-pole motor. My understanding is that the inverter cost goes up with frequency. The Leaf ...
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48 views

Creating Neutral node on Three phase Inverter

I want to create a neutral node at the output of a 3-phase Inverter for ACIM. Is it possible to do that by adding 3 resistors at the Inverter outputs and join them together to get the neutral node? ...
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Demostration of relation between Synchronous speed and Line frequency

In several books the stator magnetic field frequency is related to the line frequency of the stator current using the number of poles (which is the double of the pole pairs) do you have a ...
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SVPWM Primer for ACIM

As I am trying to implement a speed control for ACIM using SVPWM. I could not find out a focused primer on what exactly is a SVPWM technique and how is it implemented in an MCU like STM32F4? All the ...
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37 views

Earth connection on this single phase AC motor

I bought a drill press recently that comes equipped with a 0.5HP single phase AC motor. I have wired it up as per the instructions that came pasted on the motor but I do not see a terminal for earth ...
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FOC Control vs SVPWM

I wonder how far the similarities go between FOC control and SVPWM modulation and from which point on wards they are different from each other? edit: Can anyone point out a very basic primer from ...
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Inverter feed induction motor FOC Control - Stator current ripple

let us assume I am using an AC motor. It is in field oriented control. I want to see the motor rotating at 2.99Hz. Since slip speed is equal to 0.03Hz and the pole pairs number is equal to 2 I assume ...
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Phasor vs Vector vs Space Vector

I wonder what is the difference between a Phasor, a Vector and a Space Vector? A phasor is also a rotating vector in space then it means that a space vector is same as a phasor? Also by definition a ...
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42 views

SPWM vs SVPWM implementation [duplicate]

I am learning various control techniques for 3-Phase ACIMs. So far I have understood about the SPWM implementation.. in which we save Sin values in a LUT and then modulate the duty-cycle of PWM wave ...
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74 views

SPWM vs 6-step PWM vs SVMPWM

While learning 3-Phase scalar control of ACIM using STM32F407 MCU I could not clearly understand the diffrence between the following terms: 1. SPWM 2. 6-step PWM 3. SVMPWM How do they differ from ...
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21 views

Phase or Line V/F Control for ACIM

I am trying to implement V/F control for 3 phase ACIM using STM32F407 MCU. I am using 6 Complementary outputs of its Adv. Timer 1, Center aligned 256-points PWM waveform. The DC Bus voltage is 600 VDC....
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55 views

Equivalent DC circuit of 3 phase induction motor

I'm currently trying to model a simplified circuit of an inverter + 3 phase induction motor. For now, I want to represent the DC link as an ideal independent voltage source. To keep this example ...
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PWM for ACIM scalar control

I have inherited a control software for ACIM scalar control and I need to do some changes in this software. Before I can do any change I need to understand current implementation. So I have started to ...
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54 views

Inductor Machines: why is constant flux achieved before reaching nominal speed?

It is observed that an induction machine increases its voltage linearly before reaching its nominal speed. This is achieved due to the emf generated by the rotor movement. However, I find it ...
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AC motor must be run off inverted DC?

I am looking at the datasheet for a motor. This is an AC induction motor designed for use in electric vehicles. It includes the statement [my emphasis]: The motors are designed for installation in ...
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55 views

Question on TWO stage power conditioning

Suppose a induction motor is connected through a inverter. Inverter is fed from a DC-DC boost converter. My question is: to boost converter how load current will look like? Will it look like DC or AC?
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PMSM control method

Is it possible to apply the so called scalar control or V/f control which is used for ACIM control also for PMSM control? I think no because of V/f control used for ACIM does not know current ...
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Magnetic Flux loss in PM Motors

The PM motors specially BLDC or PMSM they get their armature energy from the permanent magnets on their rotors unlike the Induction Motors in which the armature gets its energy from the Stator ...
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Basic calculations of AC motor

I have a task to find a number of poles and rated slip of induction motor if frequency is 50 HZ and full load speed is 2950 rpm. However synchronous speed is not given. Is it correct to put full load ...
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48 views

Poles of induction motor rotor

For a three phase squirrel cage induction motor (IM,) we can have 2 or 4 or 6 etc. pole pairs on its stator and when these stator windings are energized by 3 phase mains supply then we get a rotating ...
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32 views

Induction Motor Poles and Drive Configuration

If an IM is driven by a VVVF drive and the poles of the motor do not match with the drive configs.. eg., IM is 4 poles but the drive setting is 2 poles.. or the other way around.. then can it create a ...
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24 views

DQ Currents in the Induction Motor Model

While studying the Induction Motor modelling and also its Vector control using DQ currents decoupling method.. I am finding it hard to see which current is which on the model diagrams. Can anyone ...
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55 views

Torque-Speed Equation for Induction Motor

I am looking for the Torque-speed equation on an Induction Motor that is used to draw the curve.
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1answer
37 views

motor slip vs rotational speed

In Induction motor theory the term slip is used as normalized relative speed of the rotor to the synchronous speed and it depends on the physical rotational speed of the rotor. Is there any special ...
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1answer
67 views

FOC sensor vs sensorless

I am trying to understand the hardware difference between the sensored and sensorless FOC 3-phase Induction Motor Drive circuit. So far what I understand is that FOC require following sensors: 1. ...
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1answer
104 views

What is the practical use of Laplace Transform?

I am trying to understand the electrical model of 3-phase Induction Model. The rotor of the motor is modeled as a variable resistor in s-domain. I fail to understand how that works practically. Can ...
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Asynchronous motor with FOC control and torque constant

So, I am studying an application with an asynchronous motor. Attached to the motor i find a driver and the control of the motor is based on the calculation of an equivalent torque constant for the ...
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3answers
50 views

Electrical machine(s)

I understand that when the torque is produced in the rotor, it tends to rotate the rotor in the same direction as that of rotation of field, but my concern is that when is the torque produced in the ...
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1answer
125 views

Difference between Field Oriented Control and Direct Torque Control

What is the fundamental difference between Field Oriented Control (FOC) and Direct Torque Control (DTC) (say for an induction motor)? Is it really the same as described in https://www.researchgate.net/...
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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 ...
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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 ...
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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 ...
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1answer
71 views

DC link capacitor for induction motor drive

I am simulating FOC drive for a 5kW,400V, 50Hz 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 ...
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2answers
107 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: ...
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65 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 ...
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3answers
42 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
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72 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 ...
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1answer
51 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 ...
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1answer
54 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 ...
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3answers
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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 ...
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97 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?
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1answer
24 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 ...
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1answer
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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?
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43 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?
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2answers
68 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 ...
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2answers
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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. ...
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1answer
281 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 ...
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2answers
67 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 ...
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1answer
160 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 ...