Stepping motor control system and recording apparatus using the same
US5625269A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1995 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | May 23, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In this invention, a stepping motor control system includes a PWM unit for generating a PWM signal corresponding to a changing duty ratio, a low-pass filter for receiving the PWM signal from the PWM unit, and converting staircase voltage levels represented by the changing duty ratio of the PWM signal into a smooth, substantially continuous voltage signal, and an arbitrary current value setting type constant current driving circuit, which receives the voltage signal from the low-pass filter, excites the excitation coil of the stepping motor by a current value set in correspondence with the voltage signal, and maintains the current value set in correspondence with the voltage of the voltage signal. Thus, a stepping motor control system which can eliminate wasteful power consumption and can realize high-precision, constant-speed rotation can be provided. When the stepping motor control system is used for driving a carriage of a recording apparatus, a recording apparatus which is free from printing nonuniformity and can achieve power saving can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.