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. 10, 1978
Filed:
Jun. 21, 1977
Per Germann Sorensen, Sonderborg, DK;
Danfoss A/S, Nordborg, DK;
Abstract
The invention relates to a single phase asynchronous motor having a main winding branch and an auxiliary winding branch for starting. The auxiliary branch has a first section having a first winding and a second section having a second winding and a capacitor in series. The second branch has a PTC resistor in shunt with the second winding and capacitor combination. This arrangement with the PTC resistor facilitates a design which involves selecting the number of turns and the resistance values of the auxiliary windings so that an optimum starting torque can be achieved at the cold temperature of the PTC resistor and a high breakdown torque can be achieved at the hot temperature of the PTC resistor.