Safety requirements and inspection of brake motors

Since most brake motors currently use electromechanical types, the electrical components require frequent inspection. Under operating voltage, according to the brake motor's operating mechanism, cycle, and operating load duty cycle, measure the braking coil when the brake motor reaches a stable state. The temperature rise range measurement method can be measured and calculated according to the relevant resistance method.

　　Since most current Brake motor use electromechanical types, the electrical components require frequent inspection. Under operating voltage, according to the brake motor's operating mechanism, cycle, and continuous load rate, measure the braking coil when the brake motor reaches a stable state. The temperature rise range measurement method can be measured and calculated according to the relevant resistance method.

　　When using insulating materials, the temperature of the brake motor coil should not exceed 80K. If other grades of insulating materials are used, the coil temperature of the brake motor should not exceed 105K. For directly exposed temperatures, it should not exceed 6K. In this case, a scald prevention mark should be added to the outside.

　　The brake motor coil's field of vision must meet the requirement that the conductive part can withstand 1000 volts for one minute without breakdown. After the brake motor temperature rise test is completed, the magnetic attraction voltage and release voltage should be measured. The attraction and release voltages of the brake motor electromagnet should be 80% and 55% lower than the rated voltage, respectively.

       

　　Some new brake motors are often equipped with advanced monitoring switches. When the brake motor malfunctions or encounters abnormalities during operation, the switch will activate, and the elevator will immediately stop running. This provides strong safety and reliability for the brake motor. However, there are currently no relevant standards, so a clear standard needs to be provided for future maintenance and inspection.

　　Another key point of the brake motor's electrical part is the control circuit of the brake coil. According to relevant standards, it is summarized as follows:

　　① During normal operation, the brake motor should remain disengaged under continuous power.

　　② To cut off the brake current, at least two independent electrical devices should be used, regardless of whether these devices are integrated with the electrical devices used to cut off the drive motor current.

　　③ Independent means that the two contactors have no mutual control relationship. The two contactors must be controlled by two independent signals and cannot be controlled by one signal.

　　④ When stopped, if the main contact of one contactor is not open, the elevator should be prevented from running again when the running direction changes next time.

　　⑤ When the motor may generate electricity, it should prevent the motor from feeding back to the electrical device that controls the brake.

　　⑥ After disconnecting the brake release circuit, the elevator should be effectively braked without additional delay. Brake motor The braking response time should not exceed 0.5s to prevent the elevator from being pulled back or slipping.