What mechanism is used to stop the rotation of an electric motor armature?

The use of a spring-applied friction brake is a common and effective mechanism for stopping the rotation of an electric motor armature. This type of brake works by utilizing springs to apply pressure against a friction material when the motor is de-energized. Consequently, the friction created between the brake pads and the rotating armature brings the motor to a quick and controlled stop.

This braking method is advantageous because it is reliable and can be designed to engage automatically when the power is removed from the motor. The simplicity of design and the ability to provide effective deceleration make it a preferred choice in various applications where quick stopping is essential.

Other braking mechanisms, while they could theoretically be used, may not be as effective or straightforward as a spring-applied friction brake for electric motors. For instance, hydraulic brakes might be used in some industrial settings but often require additional components and systems, making them less practical for smaller electric motors. A mechanical gear lock could effectively stop rotation, but it may introduce wear and require manual intervention. Magnetic field brakes, while capable of providing quick stops, are generally more complex and utilized for specific applications rather than general electric motor control.