Another PMDC motor I'm testing out. I bought a Amtek 30v tape drive motor off of eBay and it arrived with beat up bearings. The armature slops back and forth. It look like the rear bearing retainer was completly broken out. After I complained the seller admitted that he had used it a windmill. It looks like the Amtek can not take the lateral thrust loads of a wind rotor. I made a temp repair by finding a washer that just fit into the rear bearing race, and then a larger washer as retainer that was held in by three self tapping screws in three holes on the rear of the Amtek motor.
Any thoughts on this would be appreciated;
Alomst immediately I see a problem these motor bearings are meant for side loads not lateral loads. So a gear up system with rotor on a jack shaft of even 2:1 would help, with speed range and rotor thrust loading.
eBay store;
http://cgi.ebay.com/ABB-Permanent-Magnet-DC-Servomotor-Type-4414129285_W0QQitemZ110143927922QQihZ001
QQcategoryZ78195QQrdZ1QQssPageNameZWD1VQQcmdZViewItem
eBay auction;
http://cgi.ebay.com/Permanent-Magnet-DC-motor-for-Alt-E-Wind-project-or_W0QQitemZ320169385386QQihZ01
1QQcategoryZ3240QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I bought the $19.99 (new $1,071) so far I can confirm 900 rpm, 13.76v at 6.2 amps charging a battery. I can also confirm at an unknown rpm it blew out a 12v halogen spot lamp I was using for a load.
Basic specs.
Abb 4414129285
Asea Brown Boveri
SERVO MOTOR 24AMP 42VDC 1200RPM
Weight: 10.45 lbs.
This is an Italian made motor and shows it. First the terminals are fastons which makes it rough to make reliable high current connection, second that cog belt pully. The shaft is 14.8mm the pully I.D is 12mm with 4mm keyway, pulley is held on by machine screw in end of the shaft with a large shoulder washer. So the armature shaft leaves the motor body at 14.8mm and then steps down to 12mm. Attaching any thing to the shaft will be a challenge to anyone with out a lathe (me).
I was able to temp. attach a step pulley and v-belt and drive the motor a little bit. It will be awhile before I can get more spec's I have to find a cog pulley and belt for my drive motor. Grainger has a large selection but I'm not sure I want to pay their price. My drive motor has a 5/8" shaft. My thought here is to build a gear up 2:1 so the rotor can be put on a jack shaft with a thrust bearing. Then using a cog belt to transfer power. Weather proofing? The faston connection would have to be soldered and weather proofed.
-- Brandy