αSTEP/Stepper Motor: Electromagnetic Brake Structure and Service Life
The electromagnetic brake motor is equipped with a power off activated type electromagnetic brake for position holding. An example structure is shown on the right.
When a voltage is applied to the exciting coil, a magnetomotive force in the opposite direction of the magnetic force of the permanent magnet is generated, and the armature is released by the force of the leaf spring, causing the brake to be released and the motor shaft to be free to rotate.
When no voltage is applied, the armature adsorbs the yoke with permanent magnets, and the motor shaft is fixed.
Operation and Lifetime
This brake can be used for position holding without the excitation of the motor.
Do not use as a braking device to stop a rotating load.
Since brake linings are not installed, repeated braking will cause wear or seizure by making metals rubbed against each other, preventing normal operation.
Because a stepper motor has holding force when stopped, the usage scenario envisions operating the electromagnetic brake only when turning the device's power ON/OFF.