Filter circuit and control circuit for controlling a rotor
US5736801A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1996 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Aug 15, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An input signal related to x- and y-axes is expressed by a complex variable (U), a transfer function of a low-pass or high-pass filter having a real-number coefficient is represented by F(s), a central angular frequency, which may be either positive or negative, to be passed or rejected, is represented by .omega., an imaginary number unit is represented by j, and a complex coefficient transfer function produced by replacing "s" in the transfer function F(s) with (s-j.omega.) is represented by F(s-j.omega.). An output signal related to the x- and y-axes which is generated when the input signal U passes through the complex coefficient transfer function F(s-j.omega.) is expressed using a complex variable (V), producing a transfer expression formula: EQU U.multidot.F(s-j.omega.)=V Both sides of the transfer expression formula are multiplied by the denominator of F(s-j.omega.), and connected with a transfer element of the real-number coefficient so that real and imaginary parts of the transfer expression formula are equal to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.