Fig. 1. Structure of positioning magnetic needle

Fig. 2. Schematic diagram of chip transfer process

Fig. 3. Magnetic needle sucks chip model

Fig. 4. Model of positioning magnetic needle

Fig. 5. Equivalent magnetic circuit

Fig. 6. Magnetic density of air gap on upper surface of magnetic needle

Fig. 7. Optimized permanent magnets height

Fig. 8. Optimized magnet conductor height

Fig. 9. Optimized magnetic needle diameter

Fig. 10. Optimized magnetic needle height

Fig. 11. Magnetic needle spacing optimization

Fig. 12. Optimized scheme of magnetic needle

Fig. 13. Magnetically dense measuring equipment

Fig. 14. Magnetic density on upper surface of magnetic needle

Fig. 15. Magnetic needle gripping chip tooling

Fig. 16. Chip suction fixation experiment result