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一种用于乘客输送机的主驱动轴制动器包括制动元件、促动器和反促动器。促动器在异常或紧急情况期间被去激励以释放制动元件和停止该乘客输送机的工作。被激励的反促动器允许释放制动元件,但在被去激励时抑制由促动器释放制动元件,以防止由例如促动器的意外功率丧失而引起的制动元件的意外释放。