The brake of the theatre lighting stage hoist is a key component ensuring its safe operation, which can be called the "safety gate" of the equipment. Its performance is directly related to the stable hovering and precise start-stop of lifting equipment such as lighting and scenery.
Electromagnetic brake: It is usually composed of core components such as a brake electromagnet, brake shoes, brake wheel and return spring. Its working principle is like a precise "electromagnetic switch": when the theatre lighting stage hoist starts, the brake electromagnet is energized to generate a strong magnetic field. The magnetic force overcomes the elastic force of the return spring, pulling the brake shoes away from the surface of the brake wheel to form a gap, allowing the transmission system of the electric hoist to operate freely and realize the lifting or translation of lighting equipment. When the equipment stops running or a sudden power failure occurs, the magnetic field of the electromagnet disappears instantly, and the elastic force of the return spring quickly pushes the brake shoes to the brake wheel, forcibly blocking the power transmission through friction, and making the lifted object stop in a very short time. The response time of this kind of brake can be accurate to the millisecond level, which is particularly prominent in scenarios where the follow spotlight needs quick positioning. For example, in a drama performance, when an actor moves from one side of the stage to the other, the follow spotlight needs to adjust its position accordingly. The instantaneous braking ability of the electromagnetic brake of the theatre lighting stage hoist can ensure that the lighting equipment stably hovers immediately after moving, avoiding shaking caused by inertia that affects the projection effect. In addition, its compact structure and convenient maintenance make it widely used in small and medium-sized stage electric hoists.
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