# Cons of Stopping shaft connected to gearbox

1. Jul 31, 2014

### chintu

Hi,

I'm new to this field. I'm interested in knowing electrical motor/generator operations. I have few questions here could you please help me. Qtn: I have a shaft rotating a minute and not rotating 10 seconds. i.e 1min rotates + 10sec stopped + 1min rotates + 10...and so on. In this case does gear box provides constant output? or does gear box needs continuous rotating shaft? what are the cons if the shaft stops like this?

2. Jul 31, 2014

I dont understand what you mean, so you have to elaborate some more.

What is the prime mover of the shaft? What is it connected to? Why do you need a gear box? Do you need to break the shaft every 1 minute? Do you want to generate electricity from the rotating/kinetic energy stored in the shaft?

3. Jul 31, 2014

### chintu

Thank you very much for the quick reply!

Yes, shaft is connected to a rotating object which stops every minute and starts after 10seconds. So I want to connect gearbox and then to induction generator for electricity.

4. Aug 1, 2014

5. Aug 1, 2014

### chintu

Thanks again!

As I'm new to this field, I do not know much about components. Please don't mind sharing your views. I will put my question in other way. I have a mean(external process) which rotates a shaft/rod for a minute and stops 10secs and again rotates 1 minutes and so on. I want to convert this kinetic energy into electricity by attaching an asynchronous induction generator. Is it possible? If yes could you please give me what are the components that I need to add in between my shaft and generator? If not why? Does induction generator accepts breakdowns(10sec) of rotating shaft? If not, is it possible to convert this broken rotations into continuous rotation(to feed to generator)?

6. Aug 2, 2014

First of all, a gearbox only changes the speed. So to determine if you need one you have to look at the shaft rotation speed in relation to the generator nominal speed.

Problem is what are you going to do with the electricity produced. It is intermittent so you may want to store it in a battery/capacitor or something for continuous output power. Or is it going to be connected to the power grid?

Asynchronous generators are difficult to run in a stand alone system. A DC / permanent magnet machine may be easier to implement if this is the case.

There are a lot of possibilities, both electrical and mechanical solutions but it really depends on what you want to achieve, power ratings, cost, lifetime etc.