The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2025
Filed:
Jan. 02, 2024
Aac Acoustic Technologies (Shanghai) Co., Ltd., Shanghai, CN;
Chunjiang Li, Shanghai, CN;
AAC Acoustic Technologies (Shanghai) Co., Ltd., Shanghai, CN;
Abstract
A planetary roller screw linear actuator includes a shell with a receiving cavity, a driving assembly fixed in the receiving cavity, and a rotor received in the receiving cavity and driven by the driving assembly to rotate. The rotor includes a hollow shaft rotatably connected to two ends of the shell, a planetary screw rotating body in transmission connection to the shaft, and an extension rod in transmission connection to the planetary screw. The shaft is made of a magnetic material. A detection position magnet is fixed to an end of the shaft and an induction assembly is fixed to the shell and spaced from the magnet. An axial projection of the magnet is located in the shaft. A magnetic field of the magnet is not affected by an external magnetic field, and a position of the rotor is accurately determined.