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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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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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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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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Did the induction motor strongly influence the decision of AC being adopted over DC? [closed]

I have read about using motors in industrial processes and manufacturing. I am not sure if the induction motor was invented by Telsa after the decision for AC, or if they were planning on extensively ...
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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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58 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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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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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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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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Speed control of three phase induction motor

We have squirrel cage type three phase induction motors in our plant. I am very interested to know the alternative method of VFD to control the speed of motor. Can I use a dimmer? Moreover, how did ...
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I have a single phase induction motor, with no capacitor, and can't see the shaded pole. Can you help me understand how it starts or should start?

I have a small single phase, induction motor with no capacitor. It's not missing, so this has got me thinking it should be a shaded pole. However, I don't see the shaded pole and my motor is just ...
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48 views

Voltage build up in induction generator and its working principle

I had some doubts while reading about working of self excited isolated induction generator . If principle of operation of self excited isolated induction generator is similar (in a sense that in ...
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How to predict KW rating and rated current when there is no nameplate on a three phase induction motor?

I came accross the following tasks during my trainee period in an electrical firm. I was provided motor with no nameplate in following conditions: When I can remove the mechanical load from the ...
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Why does this three phase induction motor have two kW ratings?

I came accross a three phase induction motor with two kW ratings written on its nameplate against the two frequencies 50Hz and 60Hz. Does the kW rating increase with frequency? Shouldn't the kW ...
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Three Phase AC Induction Motor - Locked Rotor and Phase Drop Questions

A few questions about three phase AC induction motors. All questions relate to a Wye connected motor, running off 120V rms (phase-neutral), each phase 120° apart. This is a pure and simple three phase ...
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Motor sizing calculation

I have built a machine. The main machine shaft rotates when 4KG force is applied at a 1 foot distance from the center of the shaft. I want my machine to run at 1500 RPM. How do I select the right ...
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Parameters of induction motor from p.u to actual value

What would be the actual value of stator resistance and inductance of this motor in ohms, not in p.u? Can someone give me a valid formula for calculating it? I get the "p.u" idea but I'm not ...
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Only 3 wires in 3 phase motor terminal box

I have a 3 phase motor with the nameplate below At the terminal box you have your standard 6 pins labelled u, v, w, u1, v1, w1. However, the u1, v1, w1 is not connected on the terminal block but ...
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Does turning on inductive load (ex. AC motor) at peak input voltage reduce inrush current?

I was checking out the following project on hackster and at some point the author claims that When the load is predominantly of inductive type, the turn-on is performed at the peak of the input ...
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1answer
54 views

Maximum Voltage That Can be Applied to a Motor

I was reading about 87Hz technique. I saw we can configure the drive for a motor 400Y/230D as 400V /87hz. I know v/hz ratio should be kept constant and when we configure drive as 400V and 87 Hz and ...
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46 views

Change the speed of an induction motor with an additional capacitor

I have a three phase induction motor (a fan motor) that get power from a two phase power line. To start the motor I have a start capacitor. I need to change the speed of the motor to reach the 70% of ...
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Asynchronous generator behaviour

I have this asynchronous generator Plot (please see below) where n = efficiency, P1 = mechanical power, P2 = power to the network, cos phi2 = power coefficient, and I2 = current. I guess as the ...
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Why doesn't the shaft of a running induction motor cause an electric shock?

Source: learnenginering.com Source: learnenginering.com Source: Wikipedia.org Source: Own photo. Here are some parts of an asynchronous induction motor aka squirrel cage type rotor. As clearly ...
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Why slip is negative in this plot?

I have the following plot (please see first 2 plots below). The asynchronous motor is working as a generator. I wonder why the slip is going negative, is it because the torque also goes negative? Like ...
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Induction Motor Rotor Position and Speed Control

I am not an expert in this, but I have built some basic BLDC motors. I was recently reading up on induction motors. While I understand the idea of the AC causing a rotating magnetic field, the part I ...
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How do I quantify the effect of stack lamination on a stator and on a rotor of an induction motor?

Image from here: I would like to design (or to calculate the existing of) an induction motor, either 3 phases or single phase. I understand that both stator and the rotor made from a stacked-laminated ...
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What does this plot represent for 3 phase induction motor?

I got a 3 phase induction motor with the following plot (please see below). On Y axis: Pm + Pfe represent the mechanical and iron losses, Pm being the mechanical losses, and PFe the iron losses. On X ...
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Small single phase induction motor - triac control for startup and run

To repair a control board for a small single phase induction motor (35W 0.38A) I created this schematic to help me understand how it operates. The motor was overheating and not starting/running "...
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Simulation of field oriented control of three phase induction motor

I have been developing a simulation of the field oriented control algorithm of the three phase squirrel cage induction motor in the Xcos (equivalent of the Simulink). The simulation consists of ...
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49 views

How to set solver for control loop simulation?

I have been developing a simulation of the field oriented control of the three phase squirrel cage induction motor (control is oriented by the rotor flux). I have been using the Xcos which is an ...
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1answer
38 views

How reliable are motor power ratings through time (old motors vs new motors)?

I'm making this question here because I'm a little bit confused with what I've been seeing from some old and new 1/2 hp motors. I've bought a 1/2 hp induction motor (4-pole, single phase, capacitor ...
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69 views

Why can't I change the speed of an ininduction motor by changing the voltage?

Given a three-phase asynchronous AC motor ("induction motor"), I tried figuring out whether lowering speed / torque by lowering the supply voltage should work, similarly to how it works with ...
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88 views

How can an electric motor car have a turbo? [closed]

I am not familiar with all the different vehicles on the road nowdays but I have read descriptions of electric vehicles. i.e ( EV) that are turbo powered. How can an EV be "tubo" when turbo ...
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How to calculate rotor flux of the three phase squirrel cage induction motor?

I have a three phase squirrel cage induction motor with given parameters (stator winding connected in delta) nominal power: \$P_n = 22.4\,\mathrm{kW}\$ nominal stator voltage: \$V_{sn} = 230\,\mathrm{...
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Transverse Flux Machine

For research, I want to build a levitation system that can levitate an aluminum sheet. With traditional 3 phase Induction engines you off course get levitation, but it isn't as stable as I want to. I'...
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Creating a 3 phase current

For an experiment (generating a travelling magnetic field) in high school I need a 3 phase current. My school does not have access to 3 phase power. Therefore I need to generate the 3 phase power out ...
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Clarke transform of pwm signals

I have been developing a simulation of field oriented control of three phase induction motor. During this process I have encountered strange behavior of the Clarke transform. In case I have three ...
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What can be the consequences of a smaller airgap in a induction motor for the efficiency and rotor current?

Last year I bought 3 motors from a junkyward, and one of them was a 1/4 hp, 4 pole single-phase induction motor made by WEG for an Electrolux washing machine. Or at least it was supposed to be, cause ...
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107 views

How to increase the power of an electric motor?

What's the difference between a 1HP and 2HP electric motor? Slightly different dimensions: They look almost identical: Here are the specs: Same top speed (RPM). Same Voltage. Difference in current ...
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How does adding resistance to a wound rotor induction motor increase torque?

I read that adding resistance to the rotor circuit causes the induced current in the rotor to be more in phase with the stator current. This produces a very small phase angle difference between the ...
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Discrete Luenberger observer for the three phase induction motor

I have continuous time version of the Luenberger observer for the three phase induction motor in following form: $$ \dot{\hat{\mathbf{x}}} = \mathbf{A}\cdot\hat{\mathbf{x}} + \mathbf{B}\cdot\mathbf{u} ...
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Grinder hums but won't run. Capacitor seems good, and so do windings

My Grandpa gave me a bench grinder recently to fix. He said he was using it a lot, grinding and grinding, then he heard a pop, and it stopped working. Now it just hums, and starting it by hand doesn't ...
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What should be the phase difference in the two windings of a split-phase induction motor?

I'm having a little basic problem here. I'm trying to reconnect the coils of a 4 pole motor (concentric winding) to make a 2 pole motor. I've managed to make it work in 2 configurations so far (in two ...
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168 views

What are the properties/advantages of concentric winding?

I have seen several 4 pole induction motors that have coils wound like this: Both the main winding and the auxiliary winding have 2 pairs of these coils. This is concentric winding and I've only ...
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76 views

How to correctly read the nameplate of a Bitzer motor

This is the first time I have dealt with a BITZER compressor and the concept of part winding start. I have searched for meaning of all the information on the nameplate of a compressor motor. I want to ...
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How to size The DOL Motor Starter knowing that the motor is a part winding start motor

I have a BITZER compressor type 4GE-23Y-40P, with a part winding start option of the motor Nennspannung = nominal voltage = 380-420 Frequ = frequency = 50 Betr. strom = maximal operating current = 43....
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Unexpected behavior of the Luenberger observer for three phase induction motor

I have been developing control software for three phase induction motor. The control software will implement the field oriented control algorithm. The considered algorithm is oriented to the rotor ...
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Is there any way to wind this 4 pole motor to behave as 2 or 8 poles properly?

I got an induction motor in a junkyard, a WEG motor made for an Electrolux washing machine. It is a single-phase 1/2 hp 4 pole motor. It runs in 127 V and has a 40 uf capacitor feeding the auxiliary ...
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What is the current classification of linear motors used for positioning and scanning applications?

I am doing some research on positioning and scanning systems but I am encountering some problems trying to categorize linear motors. I can't understand what type of linear motors based on induction ...
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How does a contactor holding work?

If I'm correct, AN in below picture is an electromagnet. When the switch S is pushed, the electromagnet AN connects L1 to T1 and L2 to T2. When the switch S is released, the electromagnet AN ...

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