Electromagnetic brake working principle - Solutions - Huaqiang Electronic Network

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The electromagnetic brake is generally normally closed, and the brake is often in the closed state under the action of the spring force; when the hoist is started, the electromagnet overcomes the spring force and releases it. The specific braking process is as follows: the brake is biased against the main spring and the pull rod to press the left and right brake pads on the left and right brake arms against the brake wheel.
According to the electromagnetic attraction when the electromagnet is working
F=B*B*S/μ
Where: B is the air gap magnetic induction S is the effective area μ is the air permeability can change the inner and outer effective area S to change the inner and outer suction force F, that is, by changing the structure of the electromagnet to change the electromagnetic attraction of the inner and outer sides, so that The effective area of ​​the inner side becomes larger, so that the inner electromagnetic attraction becomes larger, and the inner and outer wear balance is achieved.
According to Hooke's law, the spring force of the spring
f=k*x
Where: x represents the length of the spring
k is the stiffness coefficient of the spring. When fF, the brake is hugged.
When fF, the brake opens.
That is, when the current is turned on, the armature of the electromagnet is attracted to the electromagnet core, the push rod is pressed, and the main spring is further compressed, and the left brake arm swings outward under the eccentric pressure of the weight of the electromagnet to make the left brake pad Leaving the brake wheel, the right brake arm and the right brake pad on it are separated from the brake wheel, thereby achieving the release of the brake. When the current is disconnected, the upper gate action is reversed.