Magnetic circuit design for linear actuator with small coil diameter

摘要

A pressure control valve assembly (10) includes a linear actuator (12) portion and a hydraulic portion (14). The linear actuator (12) includes an improved plunger (72) that has an enlarged diameter portion (106OD) near the secondary plate (80). The linear actuator (12) further includes a plunger-to-primary plate interface that has a double step (130, 132) magnetic configuration, which increases the force developed on the plunger (72).