Questions tagged [alternator]
Electrical generators that produce alternate current.
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How to wire a single wire alternator to a bridge rectifier?
I'm trying to make a 25cc weed eater generator (for fun) and I'm thinking of using an alternator to take the rotary output from the engine and turn it into electricity. I need a way to take the 12-14V ...
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356 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
42 views
Finding Impedances on a Network
Hey there the first part of the question (finding the new C value) is pretty easy. However I am stuck at the second part, it asks me to find the empadance values and etc. Can you help me with that?
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What will happen if the prime mover driving synchronous machine is accidentally disconnected?
What happens to a synchronous machine connected to an infinite grid, acting as a generator, when its prime mover fails i.e. when mechanical input at the shaft reduces to 0?
I'm assuming that the ...
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2answers
33 views
Improving a permanent magnet alternator. Replacing magnets / reducing air gap
In the case of a 3 phase PMA radial flux type, used as a wind turbine, with magnets on the surface of the rotor, is it safe or even doable to stack another magnet with the same geometry on top of the ...
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2answers
61 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
77 views
Current delivered by the vehicle alternator
I have a vehicle alternator with following parameters: 14V, 140A. In parallel to this alternator is connected 14.4V vehicle lead acid battery. The alternator is used as a power source for a load which ...
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75 views
Control of battery charging
I have been developing a control software for charging and discharging battery in a dc grid. The system consists of:
01) Three phase alternator with three phase diode bridge rectifier at its output ...
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40 views
How do brushed DC/AC generators work that have electromagnets in the stator?
Disclaimer: I do not know many things about electronics, so bear with my bad etiquette (I’m only in 8th grade).
This is for my own knowledge as well as to make a Blender animation to educate people.
...
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79 views
Excitation current calculation for alternator
I have an old brush alternator where field excitation happens in the stator. Unfortunately no information is given about the required field excitation current.
The alternator is rated 3 Phase, 400V, ...
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1answer
37 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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2answers
54 views
How to transform an AC signal of wide voltage to pulses
I want to build a device that measures frequency of possibly different electrical alternators, not having much control of their parameters. For this I need to get digital pulses out of the AC signal ...
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4answers
83 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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1answer
84 views
Help me understand my campervan split charge relay
I am new to the world of electronics, but keen to learn. The below all relates to the 12 V circuit of my van.
I have picked up a campervan which has a second "leisure" battery which powers items in ...
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2answers
114 views
Vehicle Alternator/Inverter system
I have a food van with a stock alternator on the engine, and a 3000w inverter setup. The inverter setup uses 2 Trojan leisure batteries. Somehow the inverter setup is also linked to the alternator (I’...
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Free Piston Stirling Engine Tuning Capacitor - Series Vs Parallel
Why is a tuning capacitor placed in series with a free piston stirling alternator rather than parallel with it?
I am accustomed to seeing power factor correction capacitors placed in parallel in ...
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1answer
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Alternator droop characteristics
Two synchronous generators operating in parallel supply a total load of 200 MW. The ratings of the machines 1 and 2 are 100 MW and 200 MW. Machines 1 and 2 have governor droop characteristic of 4% and ...
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Alternator field winding VS equivalent inductor
I have a question which I know is going to be more opinion biased than factual. I know this isn't the purpose of the forum, but I would really appreciate some extra opinions so I'm going to ask it ...
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1answer
110 views
How to remove flickering on car-powered LEDs?
I am powering an array of LED lights via the car alternator (the LEDs are connected to the car battery leads, but only run when the engine is on). The problem with this setup is that the natural ...
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1answer
49 views
Open-circuit alternator
Is it dangerous to run a permanent magnet alternator open-circuited? No current can flow so is all the power dissipated as heat? Is there even power generated in the inductive coils?
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Can I use a MPPT Solar Controller to charge my auxillary 12V AGM Battery from the car battery/alternator?
I have a RedArc solenoid and a Victron 75/15 Smart Solar Controller. Can I use the combination of these two units to charge an 12V AGM Deep Cycle auxiliary battery from the car battery/alternator ...
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2answers
100 views
Automotive alternator
I have been working on a project where so called Lundell alternator plays a crucial role. I haven't got any experience with this device sofar so I have decided to study some literature regarding this ...
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why the stator magnetomotive force lags behind stator armature current in salient pole alternator
https://circuitglobe.com/two-reaction-theory-salient-pole-synchronous-machine.html?fbclid=IwAR1ODRDONC27LIL83Lvb3WohPaSrIG4BRZ8l-ATyeloZEqrZ6juKw__jNMQ]
Hello guys in two reaction theory of salient ...
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72 views
Van with Solar power but no auxillary battery and only on sunny days. Do I need switches and isolators?
I have a 2018 Ram Promaster city cargo van with OEM 12v 70AH 120RC Sealed Led acid battery and a 160a alternator.
Sitting on top of the battery I have a 1200 Watt pure sine 110v inverter connected ...
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1answer
163 views
One Way Current Restrictor
Will the below circuit act as a one-way current restrictor to allow 100A to flow out of the battery, but limit charging current to 10A into the battery from the alternator?
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902 views
Alternator current when charging flat battery
I've found some voltage-current-rpm graphs for car alternators and did not quite understand one thing.
Basically, my alternator is rated at 75A (small car), which it should output above 2000 RPM or so....
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2answers
147 views
Impedance of individual component in complex AC circuit
In a AC circuit with just a capacitor or inductor, reactance is the impedance of the component, and in a non-complex RLC circuit you can just find the total impedance with vector addition (Ztot = sqrt(...
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435 views
Charge AGM battery from car alternator
What is the most efficient way of charging an AGM battery using a car alternator? I have a 12V plug connected to alligator clips which can be used in the 12V sockets inside the vehicle. Is this the ...
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1answer
87 views
4 channel digital scope
I wish to view 3 phase waveforms from an alternator (DUT) through isolation transformers via a digital oscilloscope. A 4 channel oscilloscope is obviously ideal for this as I can view the waveforms as ...
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1answer
198 views
Can car alternator back-emf damage electronics?
I know on startup a motor or generator produces back-emf and current ( correct me if I'm wrong, been a while since I've worked with electric machinery ). Thus, it'd be reasonable to expect that when ...
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1answer
1k views
How many horsepower does an alternator take from an engine at different speeds? [closed]
I want to know how much horsepower the engine deliver to the alternator at idle rpm,normal rpm and maximum rpm
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85 views
How do I bring back to life a very un-excited 3phase 10kVa alternator
We are restoring a water mill and have recently got our 2 wheels turning once more. One of them is connected to an existing 3phase 10KVa alternator which although a little old seems to be in good ...
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AVR regulation brushless vs. brush alternator
I am currently looking for an AVR for a brush alternator. Today, brushless alternators seem to be more common and so is the supply for AVRs to work for brushless alternators.
My assumption is that ...
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2answers
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How to monitor an Alternator exciter wire with MCU?
I have a internally regulated vehicle alternator which uses a conventional battery light wired in-between the exciter terminal and positive.
Obviously when the alternator isn't turning the exciter ...
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1answer
83 views
What are these SOT23 components in this RPM gauge circuit?
I'm trying to work out the input portion of the input circuit on a digital RPM gauge. It accepts a W input from a standard automotive alternator.
I can't identify the JCL446 which only uses two of ...
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83 views
wind turbine voltage multiplier
I am building a wind generator with a car alternator without a gearbox.
I know that the alternator is designed to spin at 5-10k RPM and the blades runs at 60-120 RPM so the alternator generates less ...
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1answer
453 views
Why use a star or delta connection instead of having a second output
I am winding my own small three phase ac alternator and have learned about star and delta connections. Should I use 2 three phase rectifiers to turn the current to DC or only one with a star ...
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4answers
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What stabilizes the alternators/generators?
I've completed my intern in hydroelectric power plants. I've seen large generators working to maintain voltage in 50Hz. They were turning at 187,5 rpm with 32 poles. But I wondered what stabilizes ...
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Drawing power from only one phase of a 3 phase alternator
Note: I am busy learning about 3 phase alternators. A lot of my understanding is theory so I'm running through scenario's for better understanding.
Scenario:
Lets say we have a 2KW-220V-50Hz 3 phase ...
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3answers
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Can a generator give me shock?
Can an isolated AC system like a generator which is not system grounded will be able to give me a shock if I touch it one wire? I guess it should not, because then there would not be a path back to ...
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2answers
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Smoothing capacitor for scooter regulator - High constant current drawn
I've researched the forum before posting, but it seems my question is a bit specific and not answered before. Please excuse me if I'm wrong.
So what we have here is a chinese scooter alternator, ...
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1answer
217 views
Why does the electrical power of a generator that is close to the short-circuit fault location decrease?
I was reading about shunt faults in power systems in the book Fundamentals of Power System Protection by Y.G. Paithankar and S.R. Bhide and the following sentence confused me:
"Further, in an ...
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2answers
63 views
when i connect two alternator together how much is
I saw in large power plant a lot of huge generators connected together so i wondering
when i connect two generators together in parallel ( both at 120 volts ) at same phase , frequency and speed, how ...
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318 views
Lowering the voltage of a motorcycle regulator
I've recently replaced the voltage regulator on my TW125 and it seems the voltage is a bit high for the AGM 12V battery that's inside.
At the moment, I have north of 15V unloaded with just the full ...
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2answers
1k views
Varistor transient overvoltage protection of generator
Using a varistor is a common practice in alternator excitation system. It is used with rotating rectifier diode. Is it used for transient overvoltage protection?
Is it protecting diode or rotor ...
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1answer
139 views
Why symmetrical component analysis is necessary for fault calculation?
If a 3 phase fault occurs the direct axis sub-transient reactance is sufficient to calculate the fault current. But in case of an unbalanced fault it is not.
Taking the example of Line to Ground ...
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1answer
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380/220 vs 220/380
we just purchased a generator, and we hired a team to hook it up to our office, they recently encountered a problem when they tried to run the generator, it would generate 380V, instead of the 220V ...
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1answer
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Center of star configuration
is there any reason to connect the center of winding to the ground of 3 phase rectifier? Or shouldn't I do that?
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685 views
Why does the output voltage of an alternator increases when it is connected to Capacitive load?
Why does an alternator output voltage gets higher when it is connected to capacitive load than it was with a inductive or resistive load?
I understand that when a capacitive load is connected it ...
