# Tagged Questions

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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 ...
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### 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 ...
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### 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
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### 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) ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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, ...
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### 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. ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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, ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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?
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### 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 ...
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### 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?
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### 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?
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### 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 ...
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### 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 ...
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### 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 ...
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 ...
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### 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 ...
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### 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 ...
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### 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.
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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. ...