Patent · US Expired

Brushless d. c. motor

US4115715A · kind A · utility

59Cited by

5References

35Claims

0Family size

Assignee

Papst Motoren GmbH & Co KG · DE

Inventor

Rolf Muller · St. Georgen, DE

Key dates

Filing date	Jan 25, 1977
Grant date	Sep 19, 1978
Priority date	—
Expiry date	Jan 25, 1997

Classification

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

Abstract

In a brushless d.c. motor with a permanent magnet rotor with the recessing of a radial narrow air gap, a part of the flux emanating from the rotor is concentrated onto a stationary magnetic flux sensitive control member which controls a commutator circuit. For concentration of the flux onto the control member, there is used a stationary magnetic flux conductor which extends between unlike rotor poles under recessing of a narrow air gap on both its ends. At least one of these air gaps is radially directed.

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