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. 11, 1976
Filed:
Oct. 23, 1974
Applicant:
Inventor:
Osten Schwartz, Varmdo, SW;
Assignee:
Aktiebolaget Electrolux, Stockholm, SW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
323 24 ; 3072 / ; 3072 / ; 323 36 ; 318227 ; 318345 ;
Abstract
A control circuit for a motor includes a thyristor connected to apply current to the motor, and a phase shift circuit for controlling the thyristor including a series RC circuit connected in parallel with the thyristor. The junction of the resistor and capacitor is connected to the control electrode of the thyristor. A transformer has a primary winding connected in parallel with the capacitor, and a variable resistor, which may be remotely located, connected in series with the secondary winding, for varying the phase shift of the phase shift circuit.