Patent · US Expired

Method of controlling an electric motor and apparatus for carrying out the method

US5933573A · kind A · utility

47Cited by

9References

28Claims

0Family size

Assignee

Papst Motoren GmbH & Co KG · DE

Inventors

Stefan Lukenich · Singen, DE
Thomas Von Der Heydt · St. Georgen, DE
Hermann Rappenecker · Vöhrenbach, DE

Key dates

Filing date	Apr 17, 1996
Grant date	Aug 3, 1999
Priority date	—
Expiry date	Apr 17, 2016

Classification

Technology area (CPC H)Electricity
CPC primaryH02P7/29
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric motor (12) is supplied with current (i.sub.mot) via a semiconductor switch (14). During operation, the semiconductor switch (14) is driven by a Pulse Width Modulation (PWM) unit 15 using a pulse-formed signal (32). For regulation of the duty ratio of this pulse-formed signal, a first analog signal, which is a function of at least a first motor parameter, is fed to the PWM unit. Further, a second analog signal (STBGR), which is a function of at least a second motor parameter, is fed to the PWM unit for regulation of the duty ratio. As long as the second motor parameter does not exceed a predetermined value, the duty ratio is predominantly controlled by the value of the first analog signal. When the second motor parameter exceeds the predetermined value, the duty ratio is at least predominantly controlled by the value of the second motor parameter, in order to control this second motor parameter through the PWM unit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.