反馈控制减速电机的新型开锁机构

A New Unlocking Mechanism with Feedback Control Gear Motor

介绍一种适用于收款机钱箱的由主机控制自动开锁的开锁机构,它是一种以减速电机作为执行元件并通过检测开锁状态对减速电机进行反馈控制的开锁机构。与电磁铁作为执行元件的开锁机构相比,其优点是明显的:驱动电流小而开锁力矩大而稳定,并且开锁力矩能够随着阻力的增大而增大,克服了电磁铁开锁机构启动电流大而起始力矩小的状况;由位置传感器检测产生的信号来控制减速电机停止转动,克服了电磁铁开锁机构不管锁机构是否确实打开,驱动脉冲定时结束开锁动作也结束的状况,大大地提高了开锁操作的可靠性。

This article introduces an unlocking mechanism using gear motor as the actuating element, which is feedback controlled through the detection of unlocking status. Being able to be controlled and auto-unlocked by the host machine, this unlocking mechanism is suitable for the cash drawer on POS machines. Compared with others using electric magnetic as the actuating element, the advantage of this unlocking mechanism is evident. While its unlocking moment is powerful and stable, it only requires very low drive current, and more importantly, the unlocking moment augments as the resistance force augments. It overcomes the fact that electric magnetic unlocking mechanism requires high starting current and generates low starting moment. Furthermore, the stop event of the gear motor is controlled by signals of the position sensor, overcoming the fact of electric magnetic unlocking mechanism, despite the actual unlocking status, the unlocking action ends while the timed drive pulse ends. Therefore, the reliability of the unlocking operation is greatly enhanced.