US 11,915,863 B2
Adjustable magnetic counterbalance
Jacob Daniel Bayless, Vancouver (CA); Graham Daniel Kerr, Vancouver (CA); and Jacob William Hardes, Vancouver (CA)
Assigned to Zaber Technologies Inc., Vancouver (CA)
Appl. No. 17/309,599
Filed by ZABER TECHNOLOGIES INC., Vancouver (CA)
PCT Filed Jan. 31, 2020, PCT No. PCT/CA2020/050118
§ 371(c)(1), (2) Date Jun. 9, 2021,
PCT Pub. No. WO2020/154816, PCT Pub. Date Aug. 6, 2020.
Claims priority of provisional application 62/800,348, filed on Feb. 1, 2019.
Prior Publication US 2022/0037070 A1, Feb. 3, 2022
Int. Cl. H01F 7/02 (2006.01)
CPC H01F 7/0242 (2013.01) [H01F 7/0236 (2013.01)] 79 Claims
OG exemplary drawing
 
1. Apparatus for applying a force comprising:
a first part and a second part, the first and second parts movable relative to one another in a direction of motion,
the first and second parts each comprising one or more permanent magnets arranged to provide one or more magnetic poles that are elongated and oriented parallel to the direction of motion, wherein the polarization of magnetic fields provided by the permanent magnets is substantially uniform along each of the magnetic poles in the direction of motion;
wherein the one or more magnetic poles of the first part and the one or more magnetic poles of the second part are arranged facing one another and spaced apart by a gap and for a range of travel along the direction of motion one end of each of the magnetic poles of the first part is located between opposing ends of a corresponding one of the one or more magnetic poles of the second part in the direction of motion and one end of each of the one or more magnetic poles of the second part is located between opposing ends of a corresponding one of the one or more magnetic poles of the first part in the direction of motion such that interaction of the magnetic fields of the permanent magnets of the first and second parts causes a force directed to force the first part toward or away from the second part in the direction of motion,
wherein the one or more magnetic poles of the first part are movable relative to the one or more magnetic poles of the second part in a direction different from the direction of motion to vary a magnitude of the force.