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8 views

AC Motor torque simulation

I am trying to do a simulation on the start up speed to a system powered by an AC motor. As part of this I am trying to find a mathematical torque/speed curve that I can use. I expect a curve that ...
2
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1answer
45 views

Skew angle in squirrel cage induction motor

The rotor in the squirrel cage induction motor are shorted end to end by aluminium bars; however the are placed parallel at a certain skew angle. Wikipedia states that "The conductors are often ...
0
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3answers
42 views

Induction motor electrical and mechanical angle

How do we reach the relation between mechanical angle(\$\theta m\$) and electrical angle(\$\theta e\$) as: \$\theta e = (P/2)\theta m\$ ? ; where P is the number of poles.
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1answer
59 views

Braking of Motors

Is an induction motor delivering or drawing mechanical power in the braking region? . according to the torque slip curve of an Induction motor,torque is positive and the motor continue to rotate in ...
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2answers
66 views

Starting current of an induction motor

How to calculate the Starting current of an induction motor if I have the power in kilo watts and the voltage? I have looked up formulas , but I got confused. I calculated the full load current by ...
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1answer
51 views

Does “crawling” absent incase of slip-ring induction motor?

In case of wound rotor induction motor no. of stator & rotor pole must be same otherwise the motor will not operate. Please can anybody explain the physical reason behind it. As the no. of stator ...
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1answer
392 views

What does it mean if an AC motor has two voltage ratings?

On my AC motor nameplate, it says V230/400 (delta/star). I imagine this means that it is compatible with both voltages, but what allows it to do this? How will the performance change for each?
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0answers
40 views

Variable frequency drive power transistor selection

I'm designing a variable frequency drive for a single-phase induction motor driving a water pump. The motor power is 1.3 kW, it has 2 windings with resistance of 1.5/3 Ohms. My local electrical grid ...
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1answer
132 views

Issue powering Shop Vac with Car Battery (via Power Inverter)

I am hoping to run a shop vac off a var battery (this car battery will not be attached to a car). I am hoping to use this vacuum in a remote part of our yard away from any conventual power resources. ...
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0answers
48 views

Determine active and reactive power from voltage and current over time in a three phase motor

How does one calculate active and reactive power from a set of data containing voltage-time and current-time pairs if the waves are not sinusoidal? I understand that apparent power in an induction ...
2
votes
2answers
70 views

Estimating power usage of idle motor

I would like to calculate the power usage of an idle motor. The motor drives state a power usage of approx 8-10% of full load. Would it simply be the case of taking 8-10% of the motor's power rating ...
0
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2answers
303 views

Identifying windings of a single phase induction motor

How can I identify the main and auxiliary windings of a single phase induction motor which has only three terminals (1.Red, 2. Yellow & 3. Black) out of the device? How to connect capacitor and ...
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1answer
530 views

Correct wiring for 3 wire single phase motor

I have a single phase 3 wires ( + ground ) submersible pump , I need to understand the correct wiring what type of motor is this and is the capacitor important ? the previous owner was not using this ...
2
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1answer
46 views

Determine power rating of induction motor

I got a 1-phase induction motor (230v/50hz) that was taken from a tile cutting saw that I planned to use in a home made disc sander, the labeling on the machine says it's a 600W motor but the motor ...
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1answer
37 views

Why sinusoidally varying torque in induction machine not visible

We know that torque in an induction machine varies as \$k\times[\cos(2wt)+\cos(\beta)]\$ but we don't feel it. Why it's so?
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1answer
33 views

induction motora (pole and speed relationship)

Effect of number of poles on the speed of rotor shaft on induction motor.Need the whole phenomenon. I have tried asking different teachers but no body get back to me.
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2answers
68 views

Calculate rotor slip without knowing synchronous speed

I am given the rated values of a squirrel cage induction motor: A 300hp, 2300V, 3‐phase, 60Hz squirrel‐cage induction motor turns at a full‐load speed of 590r/min. What is the approximate value ...
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1answer
91 views

How is low starting torque of asynchronous AC motors addressed when driving elevators?

Long before variable frequency drives became popular elevators were often driven by dual-speed asynchronous AC motors. Switching speeds was done by changing the number of poles (which is done by ...
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0answers
89 views

Relation between no load rotor speed and rotor current in induction motor

The rotor speed in induction motor should be the maximum at no load. As load increases, speed decreases. The current due to induced emf in the rotor winding is responsible for the production of torque ...
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1answer
84 views

High Voltage Triac Control

I'm trying to control a universal motor run from a 240V power supply using a micro-controller. There is a existing PCB that uses a potentiometer to vary the speed that I am trying to replace. I've ...
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0answers
43 views

Design of PWM controller for Wound Rotor Induction Motor

I want to make a controller for Wound Rotor Induction Motor in which effective external resistance on rotor side is varied by changing the duty cycle(PWM controller) with the help of a chopper.What ...
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1answer
62 views

Multi-speed control of cage Induction Motor

Good day All. KIndly help me to find that why slip (s) is subtracted from synchronous speed (Ns) to get value for actual speed of Induction motor in "Separate-Winding Motor" case( a method for ...
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2answers
152 views

resistive braking for induction motor?

It occurred to me that since single-phase AC induction motors can act as generators, it might be possible to brake an induction motor with a resistive load. The basic idea is that when you want to ...
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3answers
98 views

Are DC induction motors possible?

Forgive me if I am asking something absurd, I really do not understand much about electric motors. After reading the answers of Why does a Tesla car use an AC motor instead of a DC one? , I got ...
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3answers
116 views

Two induction motors are made, one 50hz one 60hz, other specs are same. Which one is larger in size? [closed]

All other specs are same. Only difference is operating frequency.
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1answer
264 views

Shaded Pole motor - change RPM by relative change to windings

I've got a small shaded pole motor (C-type) that I'm cannibalizing for use in a project, but the current RPM is too high. I don't want to spend the effort to build a micro-controller to run it. Is ...
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4answers
1k views

Is Power consumed by a motor under various load conditions constant?

Does a motor (dc /Induction/Synchronous ) consumes more power when operating at higher load than when operating at some lower load? Or power consumption remains constant/same in both cases? What I ...
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3answers
744 views

Power and control 3 phase ac induction motors with dc source

Background So we are making a drive system to be used in a medium sized catamaran. The catamaran will use two water-jets powered by two 3 phase 380v ac induction motors. The entire system will be ...
5
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2answers
174 views

converting induction motor winding to reluctance motor winding

I want to build simple reluctance motor for education purpose. I have couple of small 3 Phase AC Induction motor with 24 slot stator lap winded for 4 pole design. I want to convert it to reluctance ...
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3answers
866 views

Identify coils end in 3 phase AC induction motor for star-delta configuration

In general if I look at a 3 phase AC motor outlet wires there are six wires that comes out of motor, three of them are marked to show coils end and other three are not marked which show coils other ...
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2answers
539 views

Driving single phase induction motors on three phase inverter

I like to drive a small (150W) single phase induction motor by an existing three phase inverter by removing the capacitor and just connecting the two windings to the inverter in an incomplete triangle ...
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1answer
133 views

Equivalent circuit of a three phase induction motor

So, i know that a equivalent circuit of a single phase of a three phase induction motor is just like a transformer equivalent circuit when it is at standstill. When, however, it is rotating the ...
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2answers
889 views

Why does an induction motor work as generator when running at a speed greater than synchronous speed?

We know that induction motor works as a generator that means they converts the mechanical energy it receives into electrical energy and this energy is received by the stator. For creating its own ...
2
votes
1answer
51 views

Does an increase in load current change field winding current?

I would like to know if the current in the field winding of a DC generator using a field winding in its stator increase as the load across the output of the generator itself increases.
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0answers
148 views

Why are AC induction engines for electric cars so expensive?

I was reading about electric car engines and from what I've read there are 2 types available, DC brussless or AC induction ones. Each has its advantages and disadvantages but it seems the AC induction ...
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0answers
739 views

Calculating FLA, LRA, SFA when ReRating 3 Phase AC Induction Motors

How do you calculate full load amps, safety factor amps, locked rotor amps and no load amps when rerating a motor? For example, if I have a 3 HP, 1800 RPM, 575 Volt electric motor that I want to ...
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1answer
445 views

High current drawn by 3 phase 90 KW Induction Motor during the last part of batch mixing in a toilet soap making factory. [duplicate]

I am currently dealing with a problem of high current drawn by a 90KW three phase induction motor towards the end of the batch mixing process for a toilet soap factory. The no load current is around ...
0
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0answers
332 views

High current drawn 3 phase induction motor : 90KW motor

I am currently dealing with a 3 phase induction motor which is drawing very high current and the system gets tripped very often. I have checked the mechanical load by reducing it and then calculating ...
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3answers
2k views

Why do refrigeration compressors stall when switched off and on quickly?

All of the air conditioners I've worked with have the following words on them: Before restarting, wait three minutes. In the event the air conditioner's compressor is switched off and back on ...
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0answers
1k views

How well does a Variac work for fan speed control?

I would like to run a standard multi-speed desk fan at a lower speed than its minimum setting. On Amazon, one reviewer recommended a variac for fan control, saying that it could adjust the fan from ...
3
votes
2answers
6k views

Is the rated speed of an induction motor the synchronous speed?

E.g, if a motor is rated at 50Hz, 400V, 22A, 8.29kW, and 1460 rpm, does this means that the motor should be operated from a source voltage of 50Hz, and this corresponds to a synchronous speed of the ...
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2answers
270 views

Why my single-phase induction motor's velocity decreases after 100Hz?

I have made a single-phase inverter with control V/F using Freescale S08P and IRAMS. However when the frequency of 100hz passes the motor decreases the velocity. Some problem with my system or V/F is ...
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2answers
2k views

Shaded pole motor coil calculation, rewind 110v motor to 220v

I have yj61 series motor. Something like this It's rated AC120V 60Hz 3000RPM and was damaged by accidental connection to 220v mains. I can't find suitable spare motor, so I have to rewind this one ...
0
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3answers
153 views

Power factor meaning on induced motor

Let say A 440-V 60Hz three-phase star-connected four-pole induction motor developed 10 hp at 1745. The input power is 10kw at 0.85 lagging power factor. the no load input power is 0.6kw My ...
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2answers
143 views

Circuit of a Rotor on an Induction Motor

Here is an equivalent circuit of a rotor on an Induction motor: Can someone explain How do we arrive at this circuit? The rotor seems to be only a disc(made of a metal) with conductors embedded ...
0
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1answer
839 views

Induction motor full load and no load test meaning

Why we doing the full load and no load test for induction motor What is the purpose ? and can you provide some example? Why we doing the full load test and find power and stuff and also for no ...
1
vote
1answer
1k views

What does the speed of regulation mean?

Let's say an induction motor speed is 1150 RPM and no load condition is 1185 RPM. How do we find the regulation speed? What does regulation speed mean in relation to an induction motor?
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2answers
3k views

Induced motor slip speed stator and slip difference

This is an induced motor question. What is the difference between 'synchronous speed of the stator field' and 'the slip speed of the rotor'? If you know the equation that would also be appreciated.
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1answer
223 views

Frequency of the rotor current

This is induced motor question Let's say a three-phase induction motor is rated 50HP, 480V, 60Hz and 1150 RPM. developed torque frequency of the rotor current Is developed torque mean initial ...
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2answers
2k views

Induction motor simple power and torque

The output power is 100hp and slip is 0.02 and efficiency of 90%,4 pole induction motor Want to find the shaft torque(output torque). So I guess to find the torque we use the equation P(out) = ...