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. 13, 2003
Filed:
Feb. 20, 2001
Piezomotor Uppsala AB, Uppsala, SE;
Abstract
In a method according to the present invention, charging and discharging of motor phases ( A, B) in an electromechanical motor is performed with a small voltage difference between the voltage source and the capacitive load of the motor phase ( A, B). This is accomplished by connecting a series of voltage sources ( ), one at a time. Energy from the discharging operation is stored to be used in subsequent charging operations. In a device according to the present invention, the voltage sources ( ) are preferably provided by means of capacitive or induction voltage step-up or step-down circuits. Preferably, switches ( ) control the charging and discharging. In a preferred embodiment, the capacitance of one motor phase ( A) is used for storing charge resulting from the discharge from another motor phase ( B).