Simple mechanism controls rotation of heavy-duty shaft by mechanical comparison with rotation of small, precise, stepper motor. Mechanism can be used to limit winding and unwinding speeds of large spools and reels and to control speed of other rotating shafts. Setup incorporates reference shaft geared down from stepper motor and feedback shaft geared up from shaft to be controlled. Feedback and reference shafts are coupled with brake assembly inside stationary cylinder. When work shaft speeds up, brakes are activated automatically to slow it down.
Shaft speed control
NASA Tech Briefs ; 3 , 3
1979-01-01
Miscellaneous
No indication
English
Nonintrusive shaft speed sensor
NTRS | 1985
|Single-shaft input and double-shaft output rotary speed reducer
European Patent Office | 2023
|Smooth torque control system using differential value of shaft speed
Automotive engineering | 1996
|