Patent · US Active

Method of operating a single-stranded electronically commutated motor from a DC voltage source, and motor for carrying out such a method

US9787229B2 · kind B2 · utility

1Cited by

17References

26Claims

0Family size

Assignee

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

Inventors

Henry Weissbach · Bonndorf, DE
Arnold Kuner · St. Georgen, DE
Jens Loeffler · Donaueschingen, DE

Key dates

Filing date	Oct 17, 2008
Grant date	Oct 10, 2017
Priority date	—
Expiry date	Oct 17, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH02P6/26
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electronically commutated motor is operated from a DC voltage source (UB), e.g. from a DC link circuit (46). The motor has a permanent-magnet rotor (28) and a stator having a stator winding strand (26) in which, during operation, an alternating voltage is induced by the permanent-magnet rotor (28). It further has an H-bridge circuit (22) having power semiconductors (T1 to T4). At the beginning of a commutation operation, the presently conductive semiconductor switch of a first bridge half (38) is switched off, in order to interrupt energy delivery from the DC voltage source (UB), so that, in the other bridge half (56), a loop current (i*; −i*) flows through the stator winding strand (26), through the semiconductor switch still controlled to be conductive therein, and through a recovery diode (58; 60) associated with the blocked semiconductor switch of that other bridge half. This loop current converts the energy stored in the magnetic circuit of the motor (20) at least partly into driving energy for the permanent-magnet rotor (28), and in that context the stored energy drops to zero. This currentless state of the stator winding strand (26) is detected in a sensorless manner by m…

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