Tubular linear motor with magnetostrictive sensor

摘要

A motor includes a position-sensing magnetostrictive element that extends along a stator bore. A slider slides in the stator bore and includes a stack of motor magnets. The stack includes a first stack end that provides a magnetic field pattern that magnetizes a region of the magnetostrictive element. The motor includes shield elements such as a non-magnetic shield tube and a magnetic flux diverter.

主权项

1. A motor, comprising:
a stator that surrounds a stator bore; a position-sensing magnetostrictive element that extends along the stator bore; and a slider that slides in the stator bore, the slider having an elongated ferromagnetic portion joined to a non-ferromagnetic portion having a stack of motor magnets operable with the stator having a first stack end that has no stack end flux diverter, and the first stack end provides a first stack end magnetic field pattern that magnetizes a region of the magnetostrictive element and that intersects the stator.