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:
Oct. 08, 2019
Filed:
Mar. 03, 2017
Eaton Intelligent Power Limited, Dublin, IE;
Bharath Kumar Suda, Pune, IN;
James David, Portage, MI (US);
Eaton Intelligent Power Limited, Dublin, IE;
Abstract
A fault detection method for a multi-phase motor system applies a first duty cycle to first phase coil windings and applies a second duty cycle to second phase coil windings. The second duty cycle differs from the first duty cycle by a first difference value D. A first current Iis measured. A third duty cycle is applied to third phase coil windings and a fourth duty cycle is applied to the second phase coil windings. The fourth duty cycle differs from the third duty cycle by a second difference value D. A second current Iis measured. Line-to-line resistances R, Rare calculated using the difference values D, D, the measured currents, I, and a measured DC voltage VDC. After determining a resistance difference ΔR between the line-to-line resistances R, R, a comparison to a first non-zero threshold Tindicates a fault.