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14
votes
3answers
3k views

Why is it harder to turn a motor/generator with shorted terminals?

The shaft of an unconnected motor is easy to rotate relative to a motor with shorted terminals. If a resistive load is connected to the terminals, the turning difficulty is somewhere in between. Why ...
0
votes
1answer
75 views

Designing a windmill [closed]

As a pet project I'd like to make a small windmill. I'm in the very beginning stages so I'm still researching components to use and have a lot of questions so I came here to start my journey. I was ...
0
votes
1answer
39 views

How would I limit speed of dc motor being used as a generator?

How would I limit speed of a DC motor being used as a generator? For a project where I have to make a wind turbine that will automatically limit speed of rotation once past a certain value. Thanks :)
0
votes
1answer
59 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
0
votes
4answers
2k views

Using a BLDC motor for regenerative braking

I am planning on using a BLDC motor to drive a small go-kart like vehicle. I would like to implement regenerative braking, but am having trouble finding certain details. My main concern is being able ...
1
vote
2answers
330 views

Dc dynamo / generator to dc motor

Can a dc generator / dynamo be used as a dc motor? If so is this realistic without causing meltdown?
-1
votes
2answers
2k views

Selection of D.C. Motor for hand-cranked generator

I'm a college student working on an independent engineering project. We are using a D.C. Motor as a generator. It's going to be hooked up to a circuit with capacitors and an LED assembly to store and ...
5
votes
2answers
1k views

How does the commutator work right here?

I understand that we use the commutator as a rectifier using two segments that alternatively touch the negative and positive brush. That is when we only have one coil. What happens when we have more ...
0
votes
1answer
528 views

How to Find Angle of Armature Current

Two identical three-phase, Y-connected, synchronous generators are connected in parallel to equally share a load of 900 kW at 11 kV and 0.8 pf lagging. The synchronous impedance of each generator is 0....
1
vote
1answer
7k views

What is actually meant by “parallel paths” in a simplex progressive lap winding of a DC Generator?

Many of my textbooks mention "parallel path" term, but I am unable to actually understand it. Also along with this it would be quite helpful to know, how the polarity of brushes is determined?
0
votes
1answer
112 views

Irregular output from DC Motor used as a generator?

I was trying to make a generator out of a DC motor inrunner by following this video by following this schematic: I made this structure and started testing the phase voltages. A-, B+, C- are combined ...
1
vote
2answers
1k views

How to make a simple manual gengerator that can produce a 9 volts of electricity?

I have a project from my subject which that project was to create a manual generator that can produce up to 9 volts of electricity. I've been searching some samples that is homemade manual generators, ...
0
votes
1answer
778 views

Why won't the LED illuminate this way?

Attached a 9vdc motor to an LED to simulate a simple "generator" and I can get it to illuminate by swiftly spinning the motor in quick bursts, but if I connect a drill to the motor so there's a ...
1
vote
1answer
706 views

Washing machine / microwave motor - AC or DC

If I take an old washing machine motor and try to convert it into a generator would it work and if so would it generate AC or DC? Same question with a microwave motor. I know it uses permanent magnets ...
2
votes
2answers
61k views

Converting a DC motor to a generator

Can ANY DC motor become a generator if torque is applied to the shaft? example: Produce-Electricity-from-a-DC-Motor And by any, I mean the really cheap ones too. Or is there a specific type of motor ...
1
vote
2answers
2k views

switching DC trolling motor to generator

Would like to drag the trolling motor prop while sailing to re-charge the battery. The trolling motor is 12 VDC and the max amps at full forward speed is 50. The sailing speed of the boat will turn ...
0
votes
1answer
1k views

RD-ZD-25F, 220V/50W motor as a generator

I have 2 RD-ZD-25F, 220V/50W DC motors from 2 broken bread-making machines. Can they be used as a generator? I gave one with the hand few spins and I got a little bit of a shock from it. Thanks PS: ...
0
votes
1answer
200 views

DC motor as a generator as a torque limiter?

Is it possible to use a DC motor as a generator to regulate applied mechanical torque? A hypothetical situation: I have a DC motor acting as a generator attached to the ceiling. The motor shaft has ...
0
votes
2answers
2k views

How do I determine terminal characteristics of a dc motor with known torque and angular velocity?

How do I determine the terminal voltages and currents that will be produced by turning a dc motor at a known angular velocity and a known torque? I know that for a dc motor, the load torque has a ...
0
votes
1answer
646 views

Using a brushless DC motor for generator

Is it possible to use a brushless DC motor as a generator? If we use the brushless DC motor in the following configuration, the brushless DC motor is used in front wheel of a rover/small car, and the ...
1
vote
1answer
1k views

DC motor spun clockwise then counter clockwise creates AC current?

I am making a generator with a DC motor but the style of turning the rotor would be clockwise and then counter-clockwise, and I would want to capture as much current as possible so I hope it could be ...
0
votes
1answer
364 views

Home Built Hybrid EV Battery Charge current limiting

I have a hybrid EV that I'm working on which uses 2 48V DC motors with a maximum load of 300 Amps each, for a total maximum load of 600A. I have 2 alternators running off a gas engine generating 125 ...
-1
votes
3answers
3k views

what happens in a seperately excited DC generator when load increased

A book about electrical machines states as below ...
3
votes
2answers
3k views

Which parts of this rotor can be made out of plastic?

I'm asked to redesign a rotor, by making as much parts of it as possible out of plastic. The issue is its weight, we want to make it as light as possible. Especially the shaft & axis of it is the ...
4
votes
2answers
2k views

How does a wind turbine protect the bank from a reversal in polarity when spin direction is reversed?

This is a follow-up question to an answer to How does a wind farm prevent the fastest spinning turbine from driving the slowest one? Spinning a DC motor will generate electricity on it's terminals. ...
8
votes
3answers
1k views

Harvesting energy from a small amount of wind

I am currently investigating the feasibility of a project that would include the need of harvesting some energy from wind. The size constant of the generator and fans is about 2"x2"x2". The end goal ...