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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How can the energy produced by a generator be fed back to the motor that rotates the generator?

The drawing below shows an induction motor (IM), powered from the grid through a variable frequency drive (VFD). This IM, through a gearbox, rotates a permanent magnet synchronous machine (PMSM) ...
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Does the diameter of a coil affect the voltage it generates when a magnetic field passes it?

If two wires of equal length (let's say 1m) are wound with different diameters (3cm and 6cm) to form a coil, if equal alternating magnetic fields passes through both of them, will they generate the ...
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Does a Marx generator work good with low frequency?

If it rectifies AC to DC it still has ripple frequency. For a Marx generator, should that ripple frequency be high or will it still work with low frequency? On, YouTube the flyback transformers ...
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I've designed a new style of ac alternator where both the stator and the rotor rotate oppsite directions so that rpms multiply by each other [closed]

My body of information is on a youtube video of nothing more than a hand drawn picture. In explanation of my actions I did this to publish to establish prior art. What I'm curious to know even if its ...
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What is the loading factor of a generator?

Looking at an ENTSOE paper, I have seen this table in which the typical ''loading factors'' of different generation types are listed (see figure below). But, what is this???? I was supposing that it ...
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What is the rating of a transformer which connect a generator to the MVgrid? [closed]

What is a typical power rating (MVA) of a transformer which connects a synchronous generator to the MV grid? I would think that there is just a safety margin compared to the rating of a generator, for ...
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Transformer ratio of a transformer that connects a generator to a MV grid?

Inside my one-line diagram in which I am studying some properties of the medium voltage grid, I want to connect a generator to the MV busbar to study the hosting capacity. Therefore there is not a ...
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Converting 1-5Hz from linear generator into 60Hz

My senior design project is a linear wind generator that's modeled after the Wind Vortex Project. I've been looking for a way to internally increase the frequency of my generation subsystem from my ...
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Power factor of a synchronous based DER

I am working on a project including a synchronous based DER (2 Gens).I have a few question, I'll appreciate if you could help me. 1- I want to see what would be the typical control-mode setting of the ...
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How can I set the peak voltage in an AC waveform?

I am trying to make a small generator, nothing fancy just a coil of wire, and I was curious as to how the peak voltage of the waveform could be changed. Is the only way to increase this voltage with a ...
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What happens if you connect an AC generator to an AC motor? [closed]

An AC generator (or alternator) converts mechanical energy into electrical energy. An AC motor does the reverse. What would happen if we connect the two in such a way that the output rotational ...
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Does a grid-connected induction generator create phase difference between the grid voltage and generated current?

I saw an answer to another question that stated: "An ordinary induction generator connected to a power grid will draw lagging reactive volt-amperes from the grid and supply real power to the grid....
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DC motor as a generator [closed]

I was wondering if I could use a simple DC motor to power a small LED and how fast I would need to spin it to do so. I am making a small air-powered engine in school and I kind of want to connect it ...
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How does the electrical power from the output of a generator vary after a fault?

I know that after a sudden generation/load variation there is an imbalance between mechanical power and electrical power at the borders of generators which causes a frequency change according to the ...
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Mechanic and electric power after imbalance in power system?

After a power imbalance (for example a generator disconnection) in the electric grid, generation and consumption are not equal. This causes a dynamic transient in generators described by the Swing ...
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Electric Turbine Generator using Fan Motor

I need to build a turbine with permanent magnets using a table fan motor, I've come across many tutorials but none of them describes well all the physics on it, it would be appreciated if anyone has ...
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Calculate power output of 3 phase generator - uneven sine wave

I am using this BLDC motor [https://uav-en.tmotor.com/html/2018/navigato_0402/52.html] as a generator. The device providing the mechanical drive turns the motor about half a turn and not at a linear ...
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How are primary reserves activated for frequency control?

How are primary reserves activated for primary frequency control? In particular I have the following doubts: Is there a frequency threshold where each of them are automatically activated or they are ...
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Frequency reading 180 Hz on only one line to line measurement in three-phase backup 60 Hz LP gas powered generator in idle mode

I am running into an issue I don't understand why is happening. I have found how to "fix" it, but I am interested in ideas on what the actual source of the issue is Short version: I have a ...
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what is the surplus-control of generation?

Reading the ''P1 – Policy 1: Load-Frequency Control and Performance'' document, published by UCTE in 2009 (it is available on internet for all) I noted that there are many contributions to Load-...
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Diesel generator ground and protection devices

I have a question about protection in a portable power system. I am working on a project that is a moving truck with a generator on it. We should use the generator to feed some customers when the ...
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Help me to understand the outputs of this generator

This is taken from a Denyo TLW-300SSk generator. It is outputting U V W to 0 a 115V. Is this capable of outputting 220V as well? If so, do I have to couple two phases?
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Is the generator inside thermal power plants a synchronous type or asynchronous one? [closed]

Are thermal power plants connected to the electric power grid based on synchronous generation or asynchronous one? If a mix, which is the main one?
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Is rotating magnets around a copper band a valid electric generator design?

I am thinking of making my own small-scale vertical wind turbine, and as a result I have been thinking about designs. I have been thinking about the following design in which a number of permenant ...
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What is faster than a relay?

I need to find something that is faster than a relay. What I'm trying to build is an electrosurgical generator for acollege project. I want to accomplish something like this: This was the reference I ...
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Active PFC design and simulation with reactive loads

While designing the building blocks of a double conversion pure sine wave inverter designed for standby generators, and specifically the AC to 400V DC conversion required to feed the pure sine wave ...
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Best type of motor/generator to generate from a 10mm linear movement

Firstly, this is not a homework etc question, but am trying to make a proof of concept for something. I have a mechanical force acting on a shaft (threaded bar) moving it in the direction indicated in ...
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Can loads absorb more power than needed/requested?

I was designing the governor of a generator, implementing in Digsilent Powerfactory a 1 bus grid like that in the picture. The generator delivers 350 MW and the 3 loads withdraw respectively 25 MW, 25 ...
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DC Motor as Generator Experiment

I'm doing a "Snap Circuits" project which is supposed to demostrate that a mini DC motor can act as a generator and light an LED. Following the instructions provided, I made the following ...
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Field winding polarity in DC generator

My question is in relation to a four pole, two brush, shunt generator. (Specifically, a simple DC generator used in BMW motorcycles of the 50s and 60s.) The brushes are at 90 degrees, and the positive ...
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Understanding stepper motor as generator Vs DC motor (RMS to equivalent DC)

I am using a stepper motor as a generator in a proof of concept experiment for something. The motor came from an old printer so do not have specs for it, but I believe it's unipolar. It has 5 wires, ...
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Voltage regulation with reactive power

Supposing to have a generator located in the electric grid providing a voltage regulation controlling its reactive power output. If the voltage on the grid increases near the generator, should the ...
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Spark generator current limiter

I am using a spark generator for electrical discharge machining and mounted a current transducer to read the current value of the arc between workpiece and electrode. When the electrode gets too near ...
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3 answers
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How to drive an LED using a DIY steam generator?

I'm thinking of building a simple steam generator (the design is irrelevant here). I'd design it so that it spins a propeller that would be connected to a generic DC motor like this one. The generator ...
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Calculate the active and reactive power of the connected load after field increase in synchronous generator

A 3-phase synchronous generator connected in Y configuration has the following given parameters \$V_L=38kV, R_a=0.3\Omega,X_s=2\Omega, S=360MVA, cos{\phi}=0.83\$ Where the parameters correspond to ...
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Voltage sag during standby generator switching

A hospital has a 1.5 MVA standby 400/230-volt generator. The generator produces a severe sag that causes equipment to fail partially, the repeated switching could lead to memory corruption and some ...
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Does the effective reluctance of an air gap between two windings increase from circulating air?

If I have an inductor next to another copper coil (I don't exactly know the lingo for a coil receiving power from an inductor), and there is a significant but not large air gap between the two coils, ...
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Is a power system acting in leading mode after power factor correction bad?

I am modelling a simple power system with two generators. The power system is initially assumed to be operating with a lagging pf (the generators are providing reactive power). However, some ...
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3 Phase Motor to DC Output

In a standard car alternator there is are 3 diodes that keep each of the phases from ever pulling electrons. There is then a capacitor to smoothens it all out. However how is it possible that the ...
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Generator to run a compact industrial VFD (Sinamics V20)

I have a Siemens Sinamics V20 (0.5HP) industrial VFD (as picture), powering a 3-phase 0.25 HP electric motor. I work in the field and generator is the only way to have electric power. I am looking for ...
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Does Alternator Self-Excitation Require Rectification?

I am learning about self-excitation in alternators. My understanding is that there is residual magnetism in the rotor. As it spins, this generates a current in a stator which is then fed to the (...
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Physical Implications of a Load Angle of 0 in Power Transmission

If the load angle, delta is made to be 0, i.e. the magnetic fields of the rotor and the stator of a synchronous generator are in phase there is no real power delivered but there is some reactive power ...
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Diametric opposed magnet 3 phase alternator

I’m looking to build my own alternator to test a prototype turbine. I have been informed to build a 3 phase alternator. The magnet is diametrically opposed and will rotate at 30,000 rpm for the ...
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Asynchronous generator - Is the calculated stator current here phase current or line current?

Please see the below circuit schematic for an induction (asynchronous) generator. I have a delta connection, with a voltage = 380V, so phase voltage = line voltage = 380V Then I calculate the stator ...
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Alternator's saturation in load and no-load conditions

When a ferromagnetic material is exposed to a magnetic field in which it moves, some voltage is induced in the material. If you increase the magnetic field, the voltage is increased up to a point, and ...
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Internal EMF of a Synchronous Generator Relationship with Load side line Voltage

Say you have a 6-pole, star-connected, 60 Hz, 25 MVA rated, 600 V synchronous generator. After conducting open and short circuit tests you get the equivalent circuit with Xs = 600/(root(3)*14000) (...
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Making a 12V charger/power supply from a brushless dc motor used as a generator

This is my first question here so if I have done something wrong question-wise iI would like to know. I am building a mini tractor with a small gasoline engine. I want to use a brushless DC motor from ...
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2 votes
3 answers
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What can happen if the power factor of one generator becomes leading?

Please help with this. I have a generator which I loaded in parallel with other generators. I noticed that the power factor became exactly one and after a while leading. The other two generators had a ...
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Standard equation for delivered power from synchronous generator wrong for fractional kW machines?

When synchronous machines get to a certain size (in the \$MW\hspace{-0.8mm}s\$) the armature resistance is a lot smaller than the synchronous reactance, \$R_A << X_s\$, because of this \$R_A\$ ...
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1 vote
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The current that an AC3 contactor can support

I am constructing an ATS (Automatic Transfer Switch) for a diesel generator with a max current of 300 A. Now I already have an AC3 contactors with Ith = 100 A and I don't want to waste the money on ...
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