Process and apparatus for characterizing and controlling a synchronous motor in microstepper mode
US4710691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1986 |
| Grant date | Dec 1, 1987 |
| Priority date | — |
| Expiry date | Mar 27, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/41176
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A process for characterizing the motion of a synchronous motor in microstep mode to achieve desired precise velocity motion at the final output. The motor velocity is directly proportional to the frequency of the microstep excitation pulses which control the rate of change of sine/cosine motor currents. The motor is initially operated at normalized frequency by means of a digital memory which controls a microstep clock pulse rate. Velocity and position errors at discrete locations are then determined and frequency correction terms are inserted into the memory at a predetermined time before the correction is to take effect on the motor. Also disclosed is apparatus for controlling the operation of the motor with the thus created characterization enhanced memory. The operating apparatus includes means to devise sine and cosine signals which always remain in synchronism and through which the signals from the memory are applied to the quadrature windings of the motor. The rate at which the sine-cosine waves are incremented is determined by the preprogrammed digital memory so that the resultant rotational velocity is controlled. Additionally, when the motor operates in an optical system,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.