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-1
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0answers
27 views

What is the wiring diagram of a 3 phase motor with up-down and stop button?

What components do I have to use like connector and protection overload? Up and down should reverse the direction of the induction motor. What is the wiring diagram? Update 1 : Well I know how ...
2
votes
3answers
396 views

Why do we want higher power factor in ac motors?

Here is a simplified 3P electric motor below: This motor is simply combined of three coils facing toward to the rotator (in the center) 120 degree apart to each other. The user wants his rotator ...
-2
votes
1answer
36 views

Why start and run capacitor is used and explain it operation?

What for start and run capacitor used in induction motor why it is not replaced for compensated winding in the motor and why run capacitor is different from start capacitor
0
votes
2answers
28 views

what is the Relation of Motor Starting capacitor with Motor speed?More 2 questions in Desc

Pre-Knowledge: I know we use capacitors in Single phase induction motor because with one phase the the net torque is zero and Rotor won't rotate so we add another winding perpendicular(with capacitor) ...
1
vote
3answers
84 views

This is a question about squirrel-cage induction machine theory

When operating as a motor, the stator rotating field induces voltages (and hence currents) in the rotor windings and makes it spin (hence the rotor produces a torque). When operating as a generator I ...
0
votes
1answer
34 views

What's the point of vector control for ac machines?

for what I understood vector control controls the rotor's flux and the torque (both in magnitude) by changing the stator currents in the qd0 reference frame. let's say we are dealing with direct ...
1
vote
2answers
52 views

Low speed electric motor (from a blender)

I'm trying to build a Van der Graaf generator with my little brother for a school project. The thing is we get a electric motor from and old blender and want to use that for power our generator, but ...
1
vote
1answer
40 views

Which informations do I need to calculate the efficiency and horsepower of a 3 phase induction motor?

As far as I know the magnetic force is responsible for the motor rotation. So, horsepower of the motor is mostly related to magnetic flux on the coils (windings). Also magnetic flux is directly ...
0
votes
1answer
25 views

How should I do an efficiency analysis of an AC motor driver in LtSpice?

I have two different AC motor drivers and I need to test them for energy efficiency in an analysis tool (I know only LtSpice). But I don't know how to model an AC motor. Driver's circuitries are ...
0
votes
0answers
17 views

zvs inductive heater and electromagnetic spinner at same time

I'm trying to make a inductive heater magnetic spinner vacuum oven, and wondering if the same coils might be wound for both. Inductive allows faster heating and direct heating through the glass vs ...
2
votes
1answer
78 views

Which is the physical insight behind the widely approved 'space vector' notation used in the analysis of the dynamic model of electric machines?

When approaching the study of electric machines in transient condition, it is customary to discard the real physical vector quantities like magnetic field and magnetic induction and to define fake ...
0
votes
2answers
106 views

How does the number of poles in an induction motor determine its speed and torque?

I notice that the higher the number of poles, the slower the induction motor spins. Likewise, the lower the number of poles, the faster it spins. How does the number of poles affect its speed? Also, ...
0
votes
0answers
63 views

How to wire capacitor start ac motor

I have a motor with a blue, yellow, black, and orangish wire coming out of it and I'm trying to figure out how that should be connected to power based on the wiring diagram on the side of this motor. ...
0
votes
1answer
39 views

How to wire this Buffton motor

I bought this motor at a scrap yard and would like to wire it up for 120 volt power. There are 5 wires coming from the motor, a black, white, ground and two yellows. One yellow is numberer "2" and ...
0
votes
1answer
52 views

What is a torque motor exactly?

Wikipedia states Torque motors are normally induction motors of toroidal construction. Their main differences from other similar motors are their wide diameters, to allow for high levels of ...
1
vote
2answers
62 views

What would be the options to supply a 3-phase motor without using the power lines?

If we have a 3-phase 600A, 400V AC induction motor with a VFD. Are there any techniques to supply it with a huge acu/battery or a generator. This is to use when electricity is gone or no power network ...
1
vote
1answer
38 views

VFD Power Savings physical explanation - cubic vs square relationship

I am trying to either explain or derive where the power savings come from with a variable frequency drive (VFD). I am well aware of all the literature and generally accepted assumption that energy ...
0
votes
0answers
13 views

Clarification about dq transform

I was going through a built in model in simulink (DFIG wind generator) and came across the following equation for the dq transform: V1=1/3(Vab-a^2*Vbc) I have also attached a picture of the simulink ...
0
votes
0answers
12 views

The relation between system frequency and DIFG wind turbine rotor speed

I have a question regarding to the relation between DFIG wind turbine rotor speed and system (power grid) frequency. For example, it is said when the system frequency drops, the rotor speed also ...
0
votes
0answers
27 views

Induction motor parameters in SIMULINK

I want to model some of my home appliances using SIMULINK software. I already measured the power consumption of the exhaust fan. I found it to be consuming around 65 w at 230 v. I found the single ...
0
votes
1answer
42 views

Electric motors with both stater and rotor as electromagnets [closed]

I am totally new to the Electrical area. I wanted to do a project on Electric car which needs an Electric motor which is highly powerful and efficient. Are there any motors which have both stater and ...
1
vote
1answer
77 views

How do you choose between 450 V vs. 750 V as a power source for your EV? [closed]

I am wondering what the decision factors are to help choose between 450 V DC and 750 V DC power source for an EV (electric vehicle). The propulsion system is available in voltages between 350v and ...
0
votes
0answers
39 views

Can you use a vfd to run a capacitor start motor?

I've read on many forums, publications and specification sheets that it's not possible to run a capacitor start motor using a VFD. The start winding of such a motor is momentarily powered until the ...
0
votes
1answer
24 views

dsPICDEM MCHV-2 Development Board motor connection

I have dsPICDEM MCHV-2 Development Board and three phase induction motor. I don't know how to connect the motor to the development board. I have connected three lead wires of the motor to the three ...
-2
votes
1answer
37 views

Direct Torque Control of Induction Motor (DTC)

I was working on a project on how to design a classical Direct Torque Control drive DTC but there is a ceratin point that i can't understand. How can we calculate the Reference values of the torque ...
0
votes
2answers
30 views

Wound Rotor Induction Motor Generator Conversion

I have a 3 phase wound rotor induction motor which I would like to convert into a generator. I was wondering if it is possible to excite the rotor windings using a DC current. I attempted to do this, ...
0
votes
1answer
44 views

Starting the VFD from a specified frequency instead of 0 Hz [closed]

I have Hyundai N100 inverter. PLC is sending 0-10V analog signal to the inverter. It starts from 0 Hz and then reaches the maximum frequency of 50 Hz. Now i want it to start from 40 Hz instead of 0 Hz ...
3
votes
3answers
100 views

Motor Induction motor design specifics

I wanted to know the difference between the motor(s) used in the Tesla Model-S and commercially available motors. eBay Motor^ I have been very confused. They both are approximately the same size ...
0
votes
1answer
58 views

Measuring R1 in induction motor equivalent circuit and parameter extraction from test

I always had this question that I never really found written anywhere and I have the good or bad habit of not believing my teachers when answering this kind of odd questions. Whenever I read about ...
1
vote
1answer
92 views

How can the Model S have a three-phase motor? I thought it was DC?

Supposedly the Tesla Model S has a three-phase AC induction motor. I thought it ran on batteries. Aren't batteries DC?
0
votes
1answer
55 views

Which formulas do I need to calculate current of a 3phase induction motor

How can I know the current a motor would require to run at a given RPM. Here are some values: 160 HP motor 325 volts 2300 RPM 311 ft/lbs of torque(not sure how useful this is) induction motor using ...
0
votes
1answer
40 views

AC induction motor circuit and stall current

How can I describe the stator current of a 3-phase locked/stalled induction motor by using equivalent circuit of the motor?
0
votes
1answer
47 views

How does a moving magnetic field cause motion in the Al strip rotor?

Consider the following information: https://www.youtube.com/watch?v=7snjbmdYlDI How would you explain how the moving magnetic field causes motion in AL labeled rotor?
1
vote
1answer
613 views

I bought an air conditioner in Thailand rated 220v-240v, 50 Hz. What could happen if I use it in our country which uses 220v, 60 Hz? [closed]

I bought an air conditioner (split type) rated 220v-240v, 50 Hz. What could happen if I use it in our country which uses 220v, 60 Hz? A lead technician from a refrigerator and air conditioner shop ...
0
votes
1answer
46 views

AC single phase induction motor - phase difference problem

I want to build and AC single phase induction motor. There's the following schematic for its construction. This motor can only work if there's a 90º phase difference between \$I_1\$ and \$I_2\$ as ...
3
votes
4answers
156 views

How to control a blower using the analog output from a PID controller?

I built a biomass burner which is powered by a blower. For precise control of temperature I am using a PID controller PID500 from a company called selec . I passed the PID analog outuput to a VFD ...
0
votes
2answers
396 views

varying run capacitor for speed control of single phase motor

If I want to vary speed of single phase electric motor within say, 10 to 20%max of its rated speed ( or torque ), is it a good idea to change its run capacitor setting ? ( either via multiple ...
0
votes
1answer
110 views

Efficient Single Phase Motor Speed Control

Usually triac based speed control vary the phase angle of firing to reduce the amount of power goes in to motor, and hence control its speed. this is not very efficient method, also it may not be good ...
2
votes
3answers
2k views

Calculating the capacitor values to control ceiling fan speed

I have an old ceiling fan motor that runs with a 1.5µF run capacitor, at what I believe is, its full intended speed. With the help of some folks here at StackExchange I've wired everything up as in ...
0
votes
4answers
86 views

Three phase Motor rotation

Is it possible that a three phase motor still spin in the same direction it was even after the phases are interchanged.
0
votes
2answers
317 views

Speed control on a ceiling fan induction motor

I've managed, through the help of others here on Electronics StackExchange to get a ceiling fan motor running, at least at one speed, and in the right direction. I want to enable 3 speed settings ...
0
votes
1answer
58 views

How to wire an AC induction motor

How do I get the ceiling fan motor below wired, and how do I enable speed control? Our AC outlet supplies 220V, and the motor comes with a 1.5uF capacitor. I understand I would need an h-bridge ...
3
votes
1answer
85 views

add run capacitor to capacitor start motor to increase efficiency

Can I add a run capacitor to a capacitor start motor to increase its efficiency? I remember doing this 20 years ago and the run current dropped 20% or so, but I didn't measure the power consumed. The ...
3
votes
1answer
37 views

Is there any way to use the saturation harmonics to determine the rated voltage of a induction motor?

When the motor is running at no-load, the core eventually saturates as the AC supply voltage is increased. Therefore, harmonics will be present in the AC supply current waveform . I suspect that the ...
0
votes
1answer
45 views

Why is the voltage more in case of same polarity during a polarity test of induction motor?

I was performing experiment in the lab of my university. The experiment was supposed to be performed on a squirrel cage induction motor. But I performed it on a three phase slip ring I.M with its ...
0
votes
0answers
44 views

Calculating the value of external resistors on an induction motor

I have been given part of a question to answer; "Calculate the external resistors needed so that the motor develops 100kW @ 500rpm", with the various other values that will apply. I've calculated the ...
0
votes
2answers
82 views

Minimal power circuit for recupating three phase motor drive on DC

A thee phase motor (like an asynchronous motor or an brushless DC motor) can be driven from DC power by using a half bridge on every of the three phases (for example by six FETs) if I'm right. What ...
2
votes
1answer
78 views

Would you help me understand the design of this induction motor?

I need to understand the design of a single phase induction motor (I think it is a permanent split capacitor motor). The motor works on three different speeds. It has 8 poles as shown in figure. ...
0
votes
4answers
337 views

Ways to estimate the rated current of an induction motor without nameplate

I am looking at ways to find the rated current of the motor without the nameplate data. Methods for rated voltage has been found. Assuming that we have the rated voltage, what would be some ways or ...
0
votes
1answer
99 views

Designing a brushless DC motor:

I watched a DIY video recently on building a brushless DC motor. Can someone demonstrate for me how to calculate the max torque & max rpm of that motor based on the components that are used in ...