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:
Nov. 20, 2012
Filed:
Jun. 03, 2005
Silvio Grogg, Gossau, CH;
Curdin Stäheli, Wetzikon, CH;
Martin Ochsenbein, Russikon, CH;
Belimo Holdings AG, Hinwil, CH;
Abstract
A DC-motor () actuates a highly-reduced reduction gear of an actuating drive for a flap or valve in order to regulate a gas or liquid volume flow, particularly for heating/ventilation/climatization, or fire or room protection. Current flow in the stator coils (A, B, C) is commutated in a program-controlled manner without integrated position sensors. Algorithms enable counting rotations of rotor () of the DC-motor (). Problems related to the principle of motor rotation speed at low rpm are prevented. The DC-motor () includes a stator () having three stator coils (A, B, C) which extend over 3n stator poles (), and an annular-shaped permanent magnet rotor () having 2m permanent magnet segments with alternating polarity (N, S), a coaxial cup-shaped external rotor () and a coaxial drive shaft (), whereby n and m are whole multiplication factor numbers (1, 2, 3, 4) and are different from each other. Drive shaft () comprises, preferably, a spring () for the automatic return in case of current interruption.