Patent Number: 8,791,661

Title: Linear actuator

Abstract: A linear actuator comprising a spindle, a spindle nut, a transmission, an electrical motor, and an actuation element, is arranged to linearly move the actuation element by means of an interaction of the spindle and the spindle nut, which interaction is being driven by the electrical motor through the transmission. A position of the actuation element, the relative position between spindle and spindle nut, is determined by means of an absolute rotary position sensor and a counter. The counter keeps track of the number of under-flows and over-flows the absolute rotary position sensor generates during movement of the actuation element. A combination of a value from the absolute rotary position sensor and a count from the counter determines the position.

Inventors: Duits; Johannes Andrianus Maria (Bodegraven, NL), Rossi; Mario (Rivoli, IT)

Assignee: Aktiebolaget SKF

International Classification: G05D 3/00 (20060101)

Expiration Date: 7/29/12018