Device uses 12-pole samarium cobalt permanent-magnet rotor and three Hall-effect sensors for commutation. In prototype motor, torque constant (3-phase delta) is 65 oz-in/amp; electrical time constant (L/R) is 0.2 x 0.001 sec, and armature resistance is 20 ohms.
Ironless-armature brushless motor
NASA Tech Briefs ; 1 , 4
1977-03-01
Miscellaneous
No indication
English
Technology - Ironless motor may power airship
Online Contents | 2005
Traction motor armature banding
Engineering Index Backfile | 1942
|Armature and motor maintenance
Engineering Index Backfile | 1930
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