TheBackShed.com

Forum Index : Windmills : Need help selecting the right motor

Author

Message

digwind
Newbie

Joined: 21/04/2014
Location: India
Posts: 1

Posted: 09:30am 22 Apr 2014

Copy link to clipboard

Print this post

Hello All,

I'm a newbie here trying to figure out which motor would be the best to start with, since I've seen a couple of motors for sale at the scrap shop. I'll post all the details that I've seen on the name plates.

a) DIRECT CURRENT PERMANENT MAGNET MOTOR

Volts - Is pretty much unreadable, but a search with the model number shows its 180V
Amps - 5
RPM- not clearly readable, but looks like 4200 (somewhere in the 4k range for sure)
HP 1
Field PM
AMB 40 Degree C
Duty Treadmill Rotation CW
Made In Taiwan.

b) SERVOKING - Reversible SYnchronous motor - low speed, Instant Start - Stop, High Torque
Input - 220V SIngle Phase 50Hz.
Speed 60 RPM
Type CEW-3
HP 0.003
Torque 3kg-cm
Line AMP <0.12

c) AC Induction Motor
KW 0.18
HP 1/4
RPM 1440
Phase 1
Volts 220
Amps 2
Rating CONT
Cycles 50
INS A

I would really appreciate if someone can gimme insights on which motor to go with. Also, any technical math explanation would be of great help.

Thanks in advance.

Don B

Senior Member

Joined: 27/09/2008
Location: Australia
Posts: 190

Posted: 12:20am 02 May 2014

Copy link to clipboard

Print this post

Hi Digwind, and welcome to the forum.

The short answer to your question is that probably none of those motors that you list would be suitable.

A wind turbine is a slow speed device, and you want something that can produce a useful (and usually low voltage) output at something like 300 to 500 rpm.

Assuming that it will be direct driven for greatest efficiency, the sort of motor or generator that would be most suitable would be a low speed motor or generator with a permanent magnet field and very low winding resistance.

This will almost certainly mean that it has a large diameter, and as many poles as possible. Ideally also, it needs to be a low voltage device, or at least capable of being rewound or reconnected to operate at low voltage.

You will find many references on this site to the Fisher and Paykel washing machine motors, which are a permanent magnet field motor of large diameter, have many poles and, although designed for high voltage operation, can readily be re-connected for lower voltage operation. Please check out this site for details on the possible re-connection details.

These days, several other washing machine manufacturers have similar motors.

For smaller output, others have utilised larger sized stepper motors.

The best starting point is to trawl through this site and see what others have done.

Regards

Don B

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 02:22am 13 May 2014

Copy link to clipboard

Print this post

+1
start with an F&P or similar Lucky Goldstar washing machine motor.

Luck favours the well prepared

Print this page

To reply to this topic, you need to log in.