Research on a Test Method of Closing Delay of Elevator Brake under Emergency Braking Condition

In the elevator emergency braking condition, the elevator brake closing delay is too long, which will lead to the elevator sliding ladder, stopping distance is too large, and even the top or squatting bottom danger. The method for determining the action response time of elevator brake specified in GB/T 24478-2009 “Elevator Traction Machine” is applicable to the exit inspection and type test of brake components, but is not applicable to the elevator in use. This paper analyzes the mechanical structure and electrical control principle of the brake, divides the closing delay of the brake into electrical delay and mechanical delay according to the causes of delay, and puts forward a test method of brake delay of elevator brake based on emergency braking conditions. The test results of this method are helpful to further analyze whether the fault of the braking system is electrical fault or mechanical fault.