Single phase electromagnetic servo-actuator for use in internal combustion engine, has rotor comprising support assembly, made of ferromagnetic material, and Hall effect sensor placed between magnetic circuits formed by ferromagnetic arc

摘要

#CMT# #/CMT# The servo-actuator has an actuator (9) constituted of a stator assembly (10) comprising stator poles extending in an axial direction of the actuator and a rotor (13) comprising an axial magnetic disk (14) and a magnet support assembly (15) made of a ferromagnetic material. The support assembly is prolonged axially to support an annular shaped magnet (16). A magneto sensitive Hall effect sensor (19) of a sensor (21) is placed between magnetic circuits formed by a ferromagnetic arc surrounding the magnet. #CMT#USE : #/CMT# Used for displacing an air intake pipe valve of an internal combustion engine in a motor vehicle. #CMT#ADVANTAGE : #/CMT# The servo-actuator ensures easy integration of the sensor on the support material, made of a ferromagnetic material, without being influenced by a magnetic field created by the actuator. The support assembly is formed of a ferromagnetic material with a high magnetic permeability so as to provide magnetic shielding and prevent any influence of a motor on the sensor signal. The design of the servo-actuator allows obtaining a high torque constant proportional to a control current to limit the number of parts, while improving the thermal behavior of the actuator during its operation and yielding an industrializable servo-actuator. The servo-motor also allows obtaining optimal magnetic sealing, limits the formation of a residual magnetostatic torque and ensures better conduction of magnetic flux between the stator poles without distorting the actuator torque. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows an isolated view of a servo-actuator. 9 : Actuator 10 : Stator assembly 13 : Rotor 14 : Axial magnetic disk 15 : Magnet support assembly 16 : Annular shaped magnet 19 : Magneto sensitive Hall effect sensor 21 : Sensor.