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:
Dec. 29, 2020
Filed:
Nov. 15, 2016
Linak A/s, Nordborg, DK;
Jeppe Christian Bastholm, Sønderborg, DK;
LINAK A/S, Nordborg, DK;
Abstract
A linear actuator comprises a brushless DC motor (), a driver circuit () for providing a multiphase voltage signal to the motor () and a controller () for detecting a rotor position and providing control signals to the driver circuit () in dependence thereof. Detector circuitry () detects a signal indicative of rotor speed. The controller () is configured to control the driver circuit () to drive the motor with a first waveform of the multiphase voltage signal, when the indicative signal indicates that the rotor speed does not exceed a predetermined speed; and control the driver circuit () to drive the motor with a second waveform of the multiphase voltage signal, when the indicative signal indicates that the rotor speed exceeds the predetermined speed, wherein the second waveform is selected to drive the motor () with an efficiency less than the efficiency when driven by the first waveform.