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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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HOW TO CONVERT CAPACITOR START MOTOR WINDING TO PERMANENT SPLIT CAPACITOR MOTOR WINDING [on hold]

I have a best brand capacitor start motor (02 Pole, 24 Slots, 01 hp, Double layer Running SWG - 22.5 and 22, Auxiliary swg - 25) and burnt out it's centrifugal switch and all windings. Before ...
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Slip Control vs Constant V/F Control for 3-Phase ACIM

I am trying to understand how is Slip Control different from Constant V/F control. If I need to control the speed of 3-phase ACIM then its slip would obviously change with its rotational speed then ...
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Speed control using direct torque control of induction motor

Is there any steady state error present in speed output at any load in direct torque control of induction motor?
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Comment on Git code for ACIM VFD drive [on hold]

I am new in the field of Motor Drive. While searching for a sample code to get jump start I found this impressive repo on git: GIT Repo for VFD Drive Edit: As pointed out by 'Charles Cowie' is his ...
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Induction Machine: What would multiplying the angular electrical frequency of the machine with the electromagnetic torque give?

I understand that multiplying the output torque (load torque or mechanical torque) \$T_m\$ with the mechanical speed \$w_m\$ we obtain output power. But what would multiplying the electromagnetic ...
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Park transform of induction motor variables

1) Is it possible that after dq trasform the transformed variables will not be DC but time varying? If so in what circumstances? 2) In a induction motor, with respect to what reference frame is the ...
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Orientation of magnetic flux in a induction motor?

1) The rate of change of stator flux creates rotor emf and current which in turn produces rotor flux. What is the relationship between stator flux and rotor flux? In what direction is the rotor flux ...
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Controling a Washing Machine AC Motor Using a Relay

I would like to control the motor of my washing machine using an Arduino. It's an old washing machine with a mechanical controller and an AC motor connected to a 12.5 uF run/start capacitor. According ...
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Frequency of stator current in induction motors

I am learning about induction motors. I have a question about the stator current, especially the rotor induced current. If the rotor rotates at 1-s of sync frequency, then the emf and current ...
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Why does my shaded pole motor barely rotate when driven at 1/2 its rated voltage?

Hello electronics community! I'm attempting to service a shaded pole motor (pictured below) that is used for rotating a cylindrical fan from an electrical heater. The fan stopped rotating and so I ...
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1answer
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Loading an Asynchronous Generator

I am doing an experiment that involves loading an asynchronous 50 HZ generator. For the load to consume current it has to be a capacitive load to cause a phase shift between the current and the ...
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FEMM: Calculating Torque of an Induction Motor using the Air Gap Integral and SlidingBand

I am currently working on my Master's Thesis, building an Octave/MATLAB-Program to automatically calculate desired outputs of various induction motors. Since FEMM released the (Anti)-Periodic-Air-Gap-...
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What are differences between neodym motor wheels and copper motors?

I want to learn about electrical wheels, typically used in electric bicycles. But most of information I could find is related to marketing, and nothing on theory. This is probably due to "relative ...
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How to read Torque-Power diagram for an asynchronous motor

I'm sorry if my question is too stupid, but I am not able to correctly understand how to compare the information showed by the torque-power diagram with the motor test data for a 2000W Asynchronous ...
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3answers
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Use a TRIAC to connect/disconnect a capacitor to a PSC motor

In the image above, we see a PSC motor, with its 3 terminals, connected to a control board. This board has a RUN capacitor always connected to the motor. When the motor has to turn, the board applies ...
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2answers
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voltage transient protection for MV Motors

What types of transient voltage protection is applied on medium voltage motors and are these types of protection that are applied depended on the type of motor it is e.g Synchronous vs Induction motor?...
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Three-phase induction motor winding terminals

According to the following diagram, when the motor is delta connected as far as I can see: L1 goes into U1; U2 goes into L3 L2 goes into V1; V2 goes into L1 L3 goes into W1; W2 goes into L2 It ...
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3 phase motor change from 440 V to 220 V with diagram question

Some confusion the way my new machine is wired. I bought a sander not hooked up and the guy thought it was wired at 440. I need to set it to 220. The motor says 220/440. I have 220 at my shop with ...
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1answer
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Trouble to find out the nominal motor current and motor type of a fan from its datasheet

Is there a way to find out what is the nominal current of this fan and what type of single phase induction motor is used?
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A very basic question about VFD output frequency

I know that a VFD's inverter stage creates alternating voltages at a desired frequency for the terminals of a delta induction motor(stator voltage freq.). Normally without a VFD the nominal freq. ...
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3answers
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Is induction motor's rotor speed or torque change with delta or star connection?

An induction motor's synchronous speed Ns is given as: Ns = frequency * 120 / number of poles This formula is independent of the voltage applied to the windings. On the other hand, I know from ...
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Is it good idea to charge a battery from a starter-capacitor of an AC generator?

Some friends and I took a working electric motor out of an electric lawn mower. We suspect it is a single-phase AC induction motor (correct me if I'm wrong) with a starter capacitor (pictures above). ...
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Chop Saw Inrush Current Limiter?

I have a Dewalt Metal cutting abrasive saw that tends to open a breaker on starting up. It draws 75A on startup tripping the magnetic part of the breaker and opening it. This circuit is only to stop ...
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1answer
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operating a motor with a undersized vfd

A centrifugal pump requires 21.6 hp to flow 350 gpm at 2800 rpm with a 230/460V, 40 hp, 2-pole (3600 rpm) motor. The VFD available can operate up to a 25 hp motor at 230V, with a maximum output of 68 ...
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How to wiring up single phase induction motor?

I bought single phase induction motor with two capacitors, but I do not know how to read this wiring diagram on this motor. [
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1answer
48 views

How does torque control work in three phase motors?

For a project I am working with a three-phase AC brushless motor, connected to a motor driver. The driver allows digital control over the motor in position, velocity or torque modes. Below are a few ...
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Induced Voltage in Induction Motor

It is an image of a squirrel cage rotor. \$\textbf{B}_{S}\$ is the rotating magnetic field created by the stator. It creates an induced voltage \$\textbf{E}_{S}\$(not shown in the image) in the bars ...
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1answer
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3 phase motor running on single phase using steinmetz delta connection

How do 3 phase motors manage to run on single phase power using the Steinmetz delta connection with a single capacitor? I thought capacitors only shift the phase angle upto 90 degrees, whereas 120 ...
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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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1answer
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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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1answer
52 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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1answer
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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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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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1answer
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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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2answers
153 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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1answer
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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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1answer
58 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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1answer
59 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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2answers
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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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1answer
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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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2answers
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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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1answer
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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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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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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 ...