Simulation analysis of high-speed on-off solenoid returned by permanent magnetic force

LI Wei1，2， HU Xu-dong1， LI Qi-peng2
（1. College of Machinery and Automatic Control， Zhejiang Sci-Tech University ，Hangzhou 310018，China；
2. School of Mechanical & Automotive Engineering， Zhejiang University of Science and Technology，
Hangzhou 310023，China）

Abstract： Aiming at the mechanical spring of the hign-speed on-off electromagnetic solenoid，a high-speed on-off solenoid returned by permanent magnetic force was proposed. The magnetic spring was used instead of mechanical spring to simplify the mechanical structure of the high-speed on-off solenoid，and problems of the high-speed on-off solenoid were solved because of mechanical spring fatigue failure. The simulation analysis of the main structure parameters，such as the annular permanent magnet length，countersink's radius of plunger，the groove's depth and width of endcover，were performed using Ansoft/Maxwell. The results indicate that the annular permanent magnet length，the groove's depth and width increase，force of armature increases and has a maximal value；countersink's depth of plunger increases，force of armature decreases and has a minimal value. Considering the force condition of the armature and optimal design parameters selection，the output characteristics of push rod is good with the annular permanent magnet's length of 5 mm，the groove's depth and width of 10 mm and 4 mm，and counterbore's depth of 2 mm.
Key words： high-speed on-off； electromagnetic solenoid； returned by permanent magnetic force； simulation analysis