Drive unit for driving a stepping motor
US5298846A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1992 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | May 15, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a rotation detecting unit for detecting rotation conditions such as a rotating position and speed of a stepping motor from a rotation signal of a motor without using any external sensor such as a potentiometer or encoder, by providing detection coils a and b to the main coils A, A', B, and B' provided at the stator of a stepping motor 2, the terminal voltages E2a and E2b outputted from the detection coils a and b are sequentially subjected to a signal processing in a rotation detecting circuit 1. The rotation detecting circuit 1 is provided with an output amplifier circuit 3, a signal processing circuit 4, a subtractive calculation circuit 5 for removing unnecessary voltage components by utilizing voltages E8A, E8A', E8B, and E8B' output from a charge/discharge circuit 8, a waveform shaping circuit 6 for converting the waveform of each input signal into waveforms processable in a digital form, a diagnosing circuit 7 for diagnosing whether the motor is rotating normally, and a control circuit 9' for controlling the motor in conformity with an output of the diagnosing circuit 7, whereby a superior stepping motor control can be achieved. By further providing an application voltage …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.