Apparatus for measuring at least one state variable of a brushless direct-current motor

US5418451A · kind A · utility

Assignee

• Heidelberger Druckmaschinen AG · DE

Inventors

• Jurgen Maass · Wiesloch, DE
• Helmut Meyer · Hilden, DE
• Jurgen Seeberger · Baunach, DE

Key dates

• Filing date: Nov 16, 1992
• Grant date: May 23, 1995
• Expiry date: Nov 16, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K11/25
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An apparatus for measuring at least one state variable of a brushless direct-current motor includes 2 * n pole segments, wherein n=1, 2, 3, etc.. The pole segments are integral with a rotor of a brushless direct-current motor and are formed of permanently magnetic material generating a magnetic field. At least one Hall-effect element supplies an output voltage and is disposed in the vicinity of the rotor for impressing the magnetic field of the permanently magnetic segments on the output voltage from the at least one Hall-effect element. A logic unit receives the output voltage from the at least one Hall-effect element for determining the temperature of the brushless direct-current motor.