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1. (WO2018065774) ELECTROMAGNETIC ACTUATOR AND METHODS OF OPERATION THEREOF

Pub. No.:    WO/2018/065774    International Application No.:    PCT/GB2017/053016
Publication Date: Fri Apr 13 01:59:59 CEST 2018 International Filing Date: Fri Oct 06 01:59:59 CEST 2017
IPC: F01L 1/18
F01L 9/04
H02K 7/075
Applicants: CAMCON AUTO LIMITED
Inventors: STONE, Roger
TYRRELL, Richard
EVANS, Owen
KELLY, David
Title: ELECTROMAGNETIC ACTUATOR AND METHODS OF OPERATION THEREOF
Abstract:
A rotary electromagnetic actuator (2) includes a biasing assembly (30) for applying a torque to its rotor (4). Such an actuator may be used to operate a poppet valve of an internal combustion engine. The biasing assembly is switchable between (a) a first configuration in which the biasing assembly exerts a torque on the rotor over at least part of the range of rotation of the rotor, wherein the torque exerted varies with the rotational position of the rotor according to a torque profile, and (b) a second configuration in which the biasing assembly exerts substantially no torque on the rotor over the range of rotation of the rotor.