Abstract: Proportional solenoid is the driving devices electromagnetic to control the action of the proportional valve. The overall performance of the proportional solenoid is largely determined by this part. The traditional solenoids have the following disadvantages. The linearity of the solenoid is poor. The effective stroke is short. And the barrier magnetic is installed difficulty. In view of the above the shortcomings, a new structure of the linear force solenoid is presented. The composite magnetic force generated by the permanent magnets and electromagnetic field is using to drive the armature. The barrier magnetic in the new solenoid is canceled, so the solenoid can assemble easily. Theoretical analysis and finite element simulation is done for its design optimization in this paper. One prototype is designed and manufactured, and the designed structure is verified by experiment.

Key words: bi-directional driving, finite element analysis, magnetic stuffiness, proportional solenoid