Lifter with electropermanent magnets provided with a safety device
First Claim
1. A lifter comprising:
- a reversible magnet having a magnetization curve, a commuting coil with a longitudinal axis, and opposite polarities oriented along said longitudinal axis;
at least a working point on said magnetization curve of said reversible magnet;
a ferromagnetic core having sides and a base, and adapted to contact a load to be lifted by said lifter;
a pair of permanent magnets each arranged on one of said sides of said ferromagnetic core with their polarities oriented along an axis perpendicular to said longitudinal axis of said commuting coil;
a first magnetic sensor disposed adjacent said base of said ferromagnetic core;
a second magnetic sensor disposed above said permanent magnets for measuring the magnetic flux passing through said reversible magnet; and
a safety device for processing signals transmitted by said first and second magnetic sensors and obtaining said working point of said lifter on the magnetization curve of said reversible magnet.
2 Assignments
0 Petitions
Accused Products
Abstract
A lifter comprising at least a reversible magnet (5, 5'"'"') arranged with its polarities oriented along a vertical axis above at least a magnet (6, 6'"'"') provided with at least a pair of permanent magnets (6a, 6a'"'"') arranged with the polarities oriented along an horizontal axis on the sides of at least a ferromagnetic core (6b, 6b'"'"') suitable to contact the load (18) to be lifted, at least a magnetic sensor (11) arranged close to the base (6c, 6c'"'"') of said ferromagnetic core, and a further magnetic sensor (12) arranged over said permanent magnets (6a, 6a'"'"') so as to measure substantially only the magnetic flux passing through the reversible magnet (5, 5'"'"'), as well as a safety device (13) for processing the signals transmitted by said magnetic sensors (11, 12) and obtaining the working point of the lifter on the magnetization curve (14) of the reversible magnet (5, 5'"'"').
-
Citations
10 Claims
-
1. A lifter comprising:
-
a reversible magnet having a magnetization curve, a commuting coil with a longitudinal axis, and opposite polarities oriented along said longitudinal axis; at least a working point on said magnetization curve of said reversible magnet; a ferromagnetic core having sides and a base, and adapted to contact a load to be lifted by said lifter; a pair of permanent magnets each arranged on one of said sides of said ferromagnetic core with their polarities oriented along an axis perpendicular to said longitudinal axis of said commuting coil; a first magnetic sensor disposed adjacent said base of said ferromagnetic core; a second magnetic sensor disposed above said permanent magnets for measuring the magnetic flux passing through said reversible magnet; and a safety device for processing signals transmitted by said first and second magnetic sensors and obtaining said working point of said lifter on the magnetization curve of said reversible magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification