Patent · US Active

Brushless electric motor

US7893579B2 · kind B2 · utility

10Cited by

8References

37Claims

0Family size

Assignee

ebm-papst St. Georgen GmbH & Co. KG · DE

Inventors

Christian Rudel · Speicher, DE
Joerg Hornberger · Dornstetten, DE
Michael Schaeuble · Lambach, DE

Key dates

Filing date	Jul 27, 2006
Grant date	Feb 22, 2011
Priority date	—
Expiry date	Apr 14, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH02K29/08
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric motor has a stator (224) having a bearing tube (238) made of a magnetically transparent material; it also has a rotor (222) having a rotor shaft (234) that is at least partially journaled in the bearing tube (238), and has a ring magnet (250) that is fixedly arranged on the rotor shaft (234) inside the bearing tube (238). Two magnetic-field-dependent analog sensors (248′, 248″) are arranged on a circuit board (246) outside the bearing tube (238), at an angular distance (PHI) from one another, in order to generate rotor position signals as a function of the rotational position of the ring magnet (250). A corresponding device (150) that serves to control the motor is provided, in order to process these rotor position signals into a signal that indicates the absolute rotational position of the rotor (222).

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