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:
Sep. 16, 2014
Filed:
Oct. 04, 2011
Hanping Dai, Malmesbury, GB;
Yu Chen, Malmesbury, GB;
Tuncay Celik, Malmesbury, GB;
Libo Zheng, Malmesbury, GB;
Yongji Zhou, Malmesbury, GB;
Hanping Dai, Malmesbury, GB;
Yu Chen, Malmesbury, GB;
Tuncay Celik, Malmesbury, GB;
Libo Zheng, Malmesbury, GB;
Yongji Zhou, Malmesbury, GB;
Dyson Technology Limited, Malmesbury, GB;
Abstract
A method of controlling an electrical machine that includes selecting an edge of a rotor-position signal as a reference edge and commutating a phase winding of the electrical machine at times relative to the reference edge. The rotor-position signal has at least four edges per mechanical cycle, each of the edges being associated with a respective zero-crossing in back EMF or minimum in inductance of the phase winding. The angular position of at least one of the edges relative to its respective zero-crossing or minimum is different to that of the other edges. The reference edge is then selected from the edges such that the angular position of the reference edge relative to its respective zero-crossing or minimum is the same with each power on of the electrical machine. Additionally, a controller and control system that implement the method.