Title:
IMPROVEMENT IN OR RELATING TO THE CONTROL OF ELECTRO-MAGNETS
Document Type and Number:
WIPO Patent Application WO2001018416
Kind Code:
A3
Abstract:
A support actuator (20) comprises an electro-magnet (21) having an input current (22), provided through a current controller (23), and which is arranged to generate a magnetic field (24) having a variable intensity proportional to a variable current (25) supplied by the controller (23). The intensity of the field (24) is controlled to ensure that the magnet (21) is separated from a support armature (26) arranged to carry a load by an operational gap (27). A load cell (28) is connected between the armature (26) and a mounting position (29) for the armature (26). The cell (28) produces a control signal (30) representing variations in force generated by the magnetic field (24) which acts on the load, and the signal (30) is fed backward, along a feedback control path (31) to the controller (23) so as to control the variable current (25) such that it is made substantially equal to a gain demand force D.
Inventors:
JOHNSON FREDERICK ALISTAIR (GB)
Application Number:
PCT/GB2000/003327
Publication Date:
May 17, 2001
Filing Date:
August 31, 2000
Export Citation:
Assignee:
BAE SYS ELECTRONICS LTD (GB)
JOHNSON FREDERICK ALISTAIR (GB)
JOHNSON FREDERICK ALISTAIR (GB)
International Classes:
F16C32/04; F16F15/03; H02K33/16; (IPC1-7): F16C32/04; F16F15/03
Foreign References:
| US5387851A | 1995-02-07 | |||
| US5570286A | 1996-10-29 | |||
| US4808863A | 1989-02-28 | |||
| US4897582A | 1990-01-30 |
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