Safety Brakes BXR LE
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MIKI PULLEY Spring-actuated brake and P.W.M. controller INPUT OUTPUT

Ultra-compact design spring-actuated brakes A spring-actuated brake is a brake that is operated by the push force of a built-in spring in the event of a power failure or when the power is cut off in an emergency. In other words, when a machine is running it continuously consumes electric power in order to maintain the brake in a released condition. However, the necessary electrical energy consumed by a spring-actuated brake when the brake starts to release differs greatly from the energy required to maintain the brake in a released condition. Intrinsically, only a very small electrical energy...

Accordingly, a variety of merits can be obtained by designing a spring-actuated brake based on the assumption that it will incorporate a dedicated controller to control the necessary electrical energy for overcoming the push force of the spring when the brake starts to release and also the necessary electrical energy for keeping the brake in a released condition. Ultra-compact design with 1/2 of thickness compared with the conventional company product Compared with BX series, which is the conventional company product, The lead wire that was taken from the outside diameter can be taken the...

SPRING-ACTUATED BRAKE & CONTROLLER Static friction torque Ts [N-m] Model Input voltage BEM-24ESN7-120N DC24V ±10% Smoothing power supplies Output voltage Over excitation DC24V (0.2s), Constant excitation DC7V (±10%) - PWM control * When the input voltage is 21 VDC or less, the output voltage is interrupted. Time rating Continuous Insulating resistance DC500V, 100MQ with Megger (Between lead wire and case) Dielectric strength voltage AC1000V 50/60Hz 1min (Between lead wire and case) Ambient environment -20 to 60C 5 to 95%RH, With no condensation, freezing Mass 0.02kg Lead wire Function...

■ Option Rotor hub■ Set screw type (C) . L ^ — Bore dia. (Dimensional symbol d) (Refer to the Specifications table for details on the three-digit code.) Brake with P.W.M. controller type Nominal static friction torque • • Option (Rotor hub) Blank C P With out rotor hub Set screw type Press-fitting type Application Example of mounting on the output shaft of a servo-motor The photograph at right shows an example of an integrated construction in which an ultra-compact spring-actuated brake is installed on the output shaft of a servo motor and a rotor hub is machined onto the timing pulley. It...

SPRING-ACTUATED BRAKES ■ Precautions for handling ■ Brakes Most electromagnetic braking systems are made using flexible materials. Be careful when handling such parts and materials as striking or dropping them or applying excessive force could cause them to become damaged or deformed. ■ Lead wires Be careful not to pull excessively on the brake lead wires, bend them at sharp angles, or allow them to hang too low. ■ Frictional surface Since these are dry brakes, they must be used with the frictional surface dry. Keep water and oil off of the frictional surfaces when handling the brakes. ■...

1 ■ Consideration of required torque to hold loads Use the following equation to find the torque T required to hold a Control input Operating input Excitation voltage Control input Operating input load while stationary. T = Tℓmax × K [N m] ・ Tℓmax : Maximum load torque [N m] ・ K : Safety factor (refer to the table below) Time Excitation current 2 ■ Provisional selection of size A brake of a size for which torque T found from the equations above satisfies the following equation must be selected. Time Armature pull in time (ta) Armature release time (tar) Drag torque (Tdg) 80％ of the rated...

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