Patent · US Active

Electric machine with an adjustable air gap

US11611271B2 · kind B2 · utility

0Cited by

0References

19Claims

0Family size

Assignee

ROLLS-ROYCE DEUTSCHLAND LTD & CO KG · DE

Inventors

Christian Stanek · Marquartstein, DE
Dieter Cramer · Graz, AT

Key dates

Filing date	Sep 23, 2020
Grant date	Mar 21, 2023
Priority date	—
Expiry date	Jun 4, 2041

Classification

Technology area (CPC H)Electricity
CPC primaryH02K2201/03
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric machine includes a rotor, a stator, and an air gap formed between a magnetic device of the rotor and the stator. For the selective setting of the air gap, movement devices implemented by piezoelectric stacks are provided on the rotor and/or on the stator. The movement devices may influence radial positions of the respective magnetic device and thus set the radial air gap width. It is thereby possible to exert open-loop and/or closed-loop control over a power or torque of the electric machine without adjusting stator currents. Vibration or unbalance of the rotor may also be counteracted quickly and effectively during operation of the machine.

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