Elevator Brake Solenoids

Elevator Brake Solenoids (Spreader Solenoids) by Kendrion are linear solenoids with short stroke and high magnetic force. The brake magnets are used as actuating solenoids in drives of elevators or escalators for releasing the brakes.

Depending on the requirements, a single spreader solenoid or a double spreader solenoid (dual-brake system) is used. While the single-acting spreader solenoids are pushing solenoid actuators in one direction, the double-acting spreader solenoid consists of two solenoid systems in a housing, which presses in two opposing directions.

Both types have increasing magnetic force characteristics. Depending on the coil design, there are different duty cycles available.

Over-excitation

When operated with over-excitation (40% duty cycle), the elevator brake solenoids are overexcited by high power during the actuating phase, so that a high initial force is achieved to overcome the spring.

An overexcitation rectifier reduces the holding voltage as soon as the magnet is in the end position. In this case, the Standard duty cycle is 80%. This approach is very energy-saving and enables the provision of a high attraction force with the smallest possible space.

Double-acting spreader solenoids

Due to the increased safety requirements of the manufacturers, the double-acting elevator brake solenoid (double-acting spreader solenoid) is mainly used in modern systems.

In the case of brake solenoids for elevators and escalators, it is often necessary that the switching noises are reduced. Kendrion offers the possibility to equip the brake solenoids with a stop damper. The double-acting spreader solenoids also have a manual release.