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Questions tagged [generator]

A generator is a device that generates electricity from mechanical energy via different energy sources such as heat or kinetic energy of water.

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75 views

How to generate 100 A at 20 kHz?

I have interesting problem to overcome and seek some advice. I need to test different hall effect sensors and magnetic cores. I am currently stack at issue of bandwidth. I tested sensors at DC using ...
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37 views

ac/dc coupling and DC offset to read DC voltage in analog oscilloscope

A function generator is connected to an analog oscilloscope. I can see a sine wave. Can I read DC voltage with the help of DC offset knob? If so, can the minimum DC voltage be negative?
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81 views

Gaussian filter circuit

I want to convert a 10 MHz train of square wave, 3.3 V to a Gaussian pulse train of the same frequency and amplitude. This Gaussian pulse will be sent into an electro-optical modulator where it ...
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1answer
93 views

What determines generator frequency besides engine RPM? [closed]

I have a 230 V 3-phase generator, which runs at 180 Hz. Can I change the frequency to 60 Hz?
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354 views

To what extent are alternators “flexible” to variations in input speed and output voltage?

An automotive-style alternator works from 750 RPM to e.g. 7000 RPM, a range of nearly 10:1. In terms of output voltage, I know they target a fixed output voltage, but I believe it wouldn't be too ...
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1answer
58 views

Converting Magnetism to electricity

I've been seeing a lot of videos online of people using neodymium magnets to make a motor spin to generate electricity. If we can generate electricity from magnets why isnt this being used more often?...
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58 views

Adding poles to motor

I just recycled this motor and I would like to use it to generate and charge at 60 V. It’s rated at 6350 rpm at 95 V. It's a brushed DC motor. It has two poles. Is it possible to remove the two ...
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1answer
109 views

Oscilloscope scrolling

This questions is kind of related to this: Prevent oscilloscope scrolling However, now I have a decent signal generator (well still budget, but for my needs more than enough, FeelElec FY6900, 60 MHz ...
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1answer
48 views

Circuit to run a 3 phase magnet generator as motor?

I am trying to convert a wind generator to a brushless motor. As you can see at the image, it has 16 magnets and 12 coils. The coils are connected as 3 phase, star connection, so I have 3 output ...
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1answer
49 views

Formula for how much power a motor generates

I'm interested in the formula for how much power a handcrank motor can generate. I dont know much about electrical engineering but I'm assuming it's related to a few factor. The speed on which you ...
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4answers
65 views

Torque of motor vs operation as generator

While trying to work out which motor to use for a wind turbine project, I'm coming across torque numbers for DC motors. I'm mainly looking at a BLDC motor right now. Clearly, for a smallish turbine ...
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1answer
75 views

Why does rotor of synchoronous generator accelerate during faults?

I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator? Why does electrical torque decrease during fault in lines that ...
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30 views

How can I calculate the power capacity of a AC to DC converter?

This seems off topic, but will explain why I need to do what I am doing. I'm currently homeless, but need to build a generator on the cheap. I have a camper that uses 30a service. I have an ...
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5answers
2k views

Why are Marx Generators built like that?

Short introduction: A Marx Generator is a capacitor arrangement that transforms a DC input voltage of let's say 1 to 20 kV to a multiple of that. Capacitors get charged in parallel and when they ...
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14 views

Simplifying Salient Machine Impedance Parameters to Classical Synchronous Machine Model

I have a data sheet for generator impedance that specifies the quadrature and direct axis impedance for a salient machine. I'm not really interested in fully modeling the machine's for stability ...
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1answer
27 views

What is the reason for compensation at async generator outputs?

I see capacitor banks are installed at async generator outputs. What is the function of compensation in this case? I thought compensation was done at the consumer and for induction motors. Can this ...
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1answer
93 views

Are permanent-magnet motors equally (in)efficient as motors vs. as generators?

Given a permanent-magnet motor with an efficiency of 80% that converts 100W electrical input power into 80W mechanical output power, would the motor have the same efficiency if used as a generator? ...
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1answer
94 views

Electrical wiring help - generator

I'm trying to replace a regulator for a single phase generator. There is a symbol I don't understand. What does this symbol mean? Full diagram:
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2answers
58 views

Relating input torque on BLDC motor shaft with output current

I am trying to build a drone generator with a gasoline engine and a 14-pole,170KV, 2KW BLDC skateboard motor (this one). Before designing the system and running it, I wanted to clear out a fundamental ...
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2answers
68 views

How to create a mechanical vibration?

I need to create a system which will make vibrate horizontally a plastic tube of diameter 4cm, of height 3cm, which axis is vertical, and whose weight is 11g. The frequency should be modifiable ...
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1answer
52 views

Simulation of the Micro-kinetic generator

I am simulating the block diagram of the Autoquartz system during unwinding in Simulink. I want to get the current of microgenerator (Ibus), but I get an oscillating pattern, which you can see here ....
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37 views

Advice on thermoelectric generators

Hey everyone I was curious if you could help me. There maybe several questions in this so bear with me. Btw I am not an engineer so try and keep it simple please. What variables are needed to find how ...
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31 views

Estimation of Synchronous Generator Mechanical Damping

We know that the no load acceleration torque of a synchronous generator is given by the equation (Ta = Tm -Te - Td) where Td = Dw and D being the damping due to rotor losses. Is there a way of ...
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24 views

Role of independent and dependent sources when calculating equivalent resistance

There are plenty of topics about this question, but I did not find a precise answer. Let's consider two points A and B of a generic circuit and suppose you want to find the equivalent resistance ...
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1answer
22 views

Efficiency Test of Permanent Magnet (PM) Motor With Variac&Fixed Resistance

We have a 3-phase permanent magnet motor and want to test its efficiency in generator mode. We can give a mechanical input power with an external motor (torque meter and tachometer installed) and we ...
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1answer
50 views

Power limiter for 1 kW hydro turbine

I have a question about designing a solar-hydro energy system, as we ran into a problem in the implementation phase. We have 1 kW pv plant connected directly to a charge controller, and the 1 kW hydro ...
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2answers
65 views

Pump power factor OK on mains, but low on generator

I'm working on a submerged pump application, running on 415V three-phase. I don't know for sure, but I believe the pumps are only a few KW. The customer is saying that the pumps run fine when the ...
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1answer
68 views

How brush shifting affects current distribution in dc machines?

I understand that how armature reaction causes neutral plane to shift by some angle . If brushes are placed along Geometrical Neutral Axis, then there'd be sparking during commutation as voltage ...
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2answers
74 views

Induced EMF in electrical machines

I am currently working with machines and when I try to understand their principles in-depth, specifically in machines, I got to know that EMF is induced because of any of the two reasons: 1) Time-...
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4answers
3k views

Is a PWM required for regenerative braking on a DC Motor?

The DC Motor is question is here: DC Motor I was wondering if you use a diode and a switch in a manner shown in the below picture if the motor would exhibit regenerative braking when SW1 is open? (...
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25 views

Impact of Interconnection of One Energy Generating Plant At Another Generator Plant's Generator Bus Bar(PV Bus Bar)

As the scheme attached below, we're interconnecting 5.5 MW of generated power of upstream project(Around 2 km Away from the Interconnecting Switchyard) to the Generator Bus Bar(PV Bus Bar) on 11 kV ...
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36 views

Selecting an alternator/generator

I am designing anenergy regeneration system using a pulley attached to the wire rope of a track elevator using a 3:1 sprocket ratio I am getting around 670 RPM`s I am using two 6 volt lead acid ...
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5answers
1k views

Laptop failure due to constant fluctuation of AC frequency and voltage [closed]

I spend most of time on a boat (not on holiday :/ ) where a huge generator provides electricity. The potential problem is that the output is very dependent of the "mood" of the engine. Sometimes the ...
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4answers
71 views

What is the source of reactive power generated by the alternator?

We know an alternator or in general any source of energy does not generate energy but converts one type of energy into some other usable form. An electric generator produces both real and reactive ...
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2answers
124 views

Square wave generator won't work

I'm trying to generate a square wave at 21kHz (+13V,0V) using this schematic: I used formulas and this website to find the correct values for my components but it doesn't seem to work on Simetrix. ...
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0answers
38 views

Wind Turbine Generator Types [closed]

I am curious about wind turbine generator types used around the world today if anybody has any experience they wish to share. My question is mainly are most wind turbines of the synchronous or ...
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1answer
28 views

How can you work out the internal resistance of a rectified 3 phase generator?

If there is a star topology 3 phase generator such as this- Connected to a full-wave diode rectifier such as this- Can you approximate the circuit to this-? (assuming steady state, DC load) If so, ...
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3answers
169 views

Generator using a 2-stroke nitro engine

I'm designing a generator using a nitro engine and a motor. My design is similar to the YouTube video that I linked below. My main concern is to generate 12 V of electricity. DIY 220v Dynamo ...
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1answer
58 views

Unbalanced voltage on 3-phase wind turbine system

I work on wind turbines, I am a troubleshooter. I have a problem on the turbine which I cannot solve so far I would like to ask the help of this community. When turbine starts to generate, an ...
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0answers
54 views

Type of DC motors for generators [duplicate]

I'm looking for a motor to produce 11V. I'm a little confused about which type of motor should I use. The shaft of the motor is connected to the nitro engine and it will rotate the shaft of the motor. ...
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65 views

Charge mobile phone using wind turbine

Using this tutorial as a guide, I have put together simple DIY wind turbine capable of giving around 2.5V - 3V output across the motor when spinning the fan blades. I can also light up some LEDs when ...
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2answers
74 views

Can I combine water turbine without power loss? [closed]

I have this small 12V water turbine generator. I connected one of these in a pipe running from a container on my roof to the ground. (height ~6m) and reached ~9V. If I buy 6 and put them one after ...
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1answer
54 views

What's the phase relation between the sine wave and the sync output from a function generator?

I'm using a function generator to generate a sine wave, and am trying to use the sync (TTL) output to flash an LED at the beginning of each wave pulse. However, when I compare the sin wave and the ...
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1answer
31 views

How does an optimized car battery charging system could be designed?

To start, I saw a scooter electrics. In that implementation, after quite a weak (in my sense) generator it has some shunt linear regulator, that just dissipates overvoltage to heat. Oh god! Weak ...
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2answers
58 views

Magnetic induction with varying rpm: Dealing with excess energy

I would like to get some advice regarding the following scenario: I want to build a cheap, small generator for an energy harvesting application. There are magnets on a rotating shaft and off-the-shelf ...
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3answers
112 views

Why are core losses mechanical and not electrical in an AC power flow diagram? [closed]

The power flow diagram of a generator (a) and a motor (b) are shown. But why are core losses mechanical losses?
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26 views

Generator data for synchronizing

I have two DG sets which are to be synchronized on to the same AC bus and needless to say, they must share load. I have gathered some parametric data which I felt would decide how well these can work ...
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1answer
69 views

If the torque angle of the generator δ = 18°, how much power is being supplied by this generator at the current time?

The internal generated voltage EA of a 2-pole, delta-connected, 60 Hz, three-phase synchronous generator is 14.4 kV, and the terminal voltage VT is 12.8 kV. The synchronous reactance of this machine ...
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1answer
128 views

Understanding function generator output when units are in dBm

I am using a function generator with output in units of dBm. It has an output impedance of 50 ohms. I am measuring this output on an oscilloscope, and am failing to understand the waveform's amplitude....
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5answers
154 views

DIY generator. Simple and small

I have read many posts on this site and everyone seems very competent, so here I am... very new to this. I'm trying to learn how to convert a motor into a generator. I'm just getting a bit overwhelmed ...