PowerSwitch Main Page
PowerSwitch
The UK's Peak Oil Discussion Forum & Community
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

A new generation of turbines

 
Post new topic   Reply to topic    PowerSwitch Forum Index -> Wind Power
View previous topic :: View next topic  
Author Message
Aurora



Joined: 24 Jan 2007
Posts: 8502

PostPosted: Tue Aug 25, 2009 6:36 am    Post subject: A new generation of turbines Reply with quote

Quote:
The Guardian - 24/08/09

Faced with the need to cut fuel costs, an Oxford professor has invented a cheap wind turbine that uses an induction motor.

Article continues ...
Back to top
View user's profile Send private message
Bandidoz
Site Admin


Joined: 24 Nov 2005
Posts: 2705
Location: Berks

PostPosted: Tue Aug 25, 2009 12:22 pm    Post subject: Reply with quote

Sounds familiar:

http://www.DODGY TAX AVOIDERS.co.uk/Motors-as-Generators-Micro-hydro-Power/dp/1853396451/ref=sr_1_1?ie=UTF8&s=books&qid=1251199352&sr=8-1
_________________
Olduvai Theory (Updated) (Reviewed)
Easter Island - a warning from history : http://dieoff.org/page145.htm
Back to top
View user's profile Send private message
adam2
Site Admin


Joined: 02 Jul 2007
Posts: 6600
Location: North Somerset

PostPosted: Wed Aug 26, 2009 9:38 am    Post subject: Reply with quote

Bandidoz wrote:
Sounds familiar:

http://www.DODGY TAX AVOIDERS.co.uk/Motors-as-Generators-Micro-hydro-Power/dp/1853396451/ref=sr_1_1?ie=UTF8&s=books&qid=1251199352&sr=8-1


Indeed, nothing new here.

Standard, off the shelf induction motors can indeed be used as generators, such motors are very cheap owing to mass production.

However they require either connection to the grid, or a special load controller.
Some early grid tied wind turbines used induction motors as generators, the drawback of such a system is that when the wind speed drops, the machine runs as a motor and consumes grid power.
Automatic disconnection at low speeds adds to complications.

For stand alone use, an induction motor used as a generator requires a carefully controlled load, if the load is in excess of the mechanical input, then the voltage and frequency will fall substantialy.
If the electrical load is less than the mechanical input, then the voltage and frequency will rise, possibly to dangerous levels.

In micro hydro systems, the water flow flow and head are normally held constant, and the electrical load also held constant.
Very basic systems simply leave lights on 24/7, more sophisticated systems use a dump load for the surplus power, sometimes the surplus is wasted, but in cold climates it can be used for heating.

To use an induction motor as a generator with continualy varying wind power, is no doubt possible but would appear to involve considerable complication.

The main costs of a wind turbine are the blades, which have to be a certain size to capture enough wind, and the supporting mast or tower.
The generator is a relatively small part of the cost.
_________________
"Installers and owners of emergency diesels must assume that they will have to run for a week or more"
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    PowerSwitch Forum Index -> Wind Power All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group