Title:
【発明の名称】最小にされた補助磁石を有するアクチュエーター、及びそのようなアクチュエーターを設けられたスロットル装置
Document Type and Number:
Japanese Patent JP2000504496
Kind Code:
A
Abstract:
An electrical actuator for a throttle device has a stator and a rotor, the rotor being coupled to the throttle device and comprising a permanent main magnet. The stator includes in axially extending slots therein auxiliary permanent magnets which interact with the rotor magnet to exert a magnetostatic torque (TMS) on the rotor which tends to rotate it to a pre-set rest position. The stator also has an energizing coil which when actuated results in an electromagnetic torque (TEM) on the rotor which is opposed to the magnetostatic torque and causes the rotor to pivot through a limited angle of rotation. The thickness and width of the auxiliary permanent magnets are selected so that the cross-sectional area thereof provides a maximum value of the magnetostatic torque (TMS) per unit volume thereof, thus minimizing the necessary volume and weight of the auxiliary permanent magnets.
Inventors:
Akerman Bernd
Application Number:
JP52339098A
Publication Date:
April 11, 2000
Filing Date:
October 27, 1997
Export Citation:
Assignee:
Philips Electronics Nemrose Fennaught Shap
International Classes:
F02D11/10; H01F7/08; H01F7/00; H02K26/00; (IPC1-7): H01F7/08
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)