Digitalized position control for a D.C. motor
US4588936A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1984 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | May 31, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B19/39
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A D.C. motor position control system operates either in the motor speed detection mode or in the motor position detection mode. A rotary encoder develops an approximate sinusoidal position indicating analog signal in response to the rotation of the D.C. motor. A waveform shaping circuit receives the approximate sinusoidal position indicating analog signal and develops a rectangular position indicating digital signal to a phase comparator which compares the phase of the rectangular position indicating digital signal with the phase of a speed instructing pulse signal so as to control the motor speed in a phase-locked-loop (PLL) manner in the motor speed detection mode. A slice level determination circuit divides the voltage level of the approximate sinusoidal position indicating analog signal into 16 (sixteen) degrees to obtain a sliced position indicating digital signal which is used to control the motor position in the motor position detection mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.