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:
May. 08, 2001
Filed:
Jul. 07, 1999
Applicant:
Inventors:
Harri Hakala, Hyvink{umlaut over (aa)}, FI;
Esko Aulanko, Kerava, FI;
Panu Kurronen, Hyvink{umlaut over (aa)}, FI;
Assignee:
Kone Corporation, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 5/162 ; H02P 2/00 ; H02P 7/628 ; G05B 1/02 ;
U.S. Cl.
CPC ...
H02P 5/162 ; H02P 2/00 ; H02P 7/628 ; G05B 1/02 ;
Abstract
A method and an apparatus for damping the vibrations of an alternating current motor is provided. The motor is supplied from an alternating current source with a supply voltage whose frequency is the basic frequency. Additionally the motor is fed with a second voltage having a frequency equal to the basic frequency multiplied by the quantity 2*m*q−1. In the equation, m is the number of the phases of the motor and q is the number of slots per phase.