Self-sensing magnetic lock assembly

The objective of this project is to realize an energy-efficient operation of electromagnetic (EM) locking devices using the inductive self-sensing technique, i.e. employing the existing actuation coil as a sensing medium. EM locking devices such as EM locks and locking solenoids have been increasingly used as new security devices in industrial and commercial buildings due to fully electronic operation. One of drawbacks of such EM devices is that a significant amount of energy is often wasted through their continual use, especially in applications where the maximum holding power is seldom needed. The main idea is to operate an EM locking device in such a way that its full power is supplied only when is needed. More specifically, we propose to run the existing coil as an inductive sensor using significantly less power during normal operation. Any imminent attempt to disengage an EM lock can be instantly detected by the self-sensing coil and its full locking power can then be engaged to prevent it from unlocking. A stochastic detection method called the generalized likelihood ratio test (GLRT) has been implemented to improve the energy-saving operation of the EM device. Proposed strategies are experimentally verified using a commercial EM lock, which demonstrated that more than 75\% of the original power can be saved by the proposed method while keeping the same locking performance.

Overview of EM Lock

Circuit Diagram and Relaly Control Timing Diagram

Lab Test

This research has been conducted in collaboration with Rutherford Controls Inc. (RCI). 

Related publication