Patent · US Active

Method and circuit arrangement for detecting motor load without sensors and for controlling motor current according to load for a stepper motor

US9112439B2 · kind B2 · utility

4Cited by

4References

18Claims

0Family size

Assignee

TRINAMIC MOTION CONTROL GMBH & CO. KG · DE

Inventors

Lars Larsson · Hamburg, DE
Bernhard Dwersteg · Hamburg, DE

Key dates

Filing date	Nov 9, 2011
Grant date	Aug 18, 2015
Priority date	—
Expiry date	Apr 8, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG05B2219/41326
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method and a circuit arrangement are provided in which a mechanical load applied to the motor shaft or a load angle of the motor can be detected without sensors in a stepper motor. This is achieved substantially based on the fact that the load or the load angle creates a mutually induced voltage (back EMF) in the motor coils and the load or the load angle is detected by determining the phase shift of the motor voltage at at least one of the motor coil relative to the coil current at said motor coil connection, the phase shift being caused by the mutually induced voltage. A method and a circuit arrangement are also provided wherein the motor current of a stepper motor can be controlled according to load angle in such a way that the current consumption of the motor is relatively low.

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