CN-117387480-B - Electromagnetic brake air gap distance detection method

Abstract

The invention provides an electromagnetic brake air gap distance detection method, which solves the problems of low manual detection efficiency and high difficulty in the existing electromagnetic brake air gap distance detection process. The method comprises the steps of collecting data, setting a plurality of calibration positions between an electromagnetic brake armature and a static plate, fixing the electromagnetic brake armature according to the calibration positions to form air gap positions corresponding to the calibration positions, electrifying a brake coil, sequentially recording coil voltage u and coil current i of each calibration air gap, calculating a flux linkage curve corresponding to each air gap according to a flux linkage calculation formula, establishing a discrete flux linkage-ampere meter, and calculating detection point air gaps according to the four adjacent point data and upper and lower limit air gaps. The brake clearance preset value pre-stored in the real-time state monitoring device can be compared with the air gap current value automatically detected, so that the abrasion condition of the brake is judged, real-time early warning is realized, and equipment accidents are avoided to the greatest extent.

Inventors

• ZHANG WEI
• ZHANG ANGE
• WU HUI
• YU CHANGGUANG
• Lv Wencai

Assignees

• 辽宁优力安机电设备有限公司

Dates

Publication Date

20260512

Application Date

20231130

Claims (1)

1. 1. The method for detecting the air gap distance of the electromagnetic brake is characterized by comprising the following steps of: Step one, collecting data Fixing the electromagnetic brake armature according to the calibration positions to form air gap positions corresponding to the calibration positions, electrifying a brake coil, and sequentially recording the coil voltage u and the coil current i of the air gap at each calibration position; step two, calculating a flux linkage curve corresponding to each air gap by a flux linkage calculation formula The coil voltage u and coil current i recorded for each air gap calculate the flux linkage according to the following formula R is the coil resistance, t is the sampling time, Step three, establishing a discrete flux linkage-ammeter (1) Equidistant setting a plurality of discrete current points i k ＝{i 1 ,i 2 ,…,i m for the brake current; (2) The flux links corresponding to the discrete current points i k are connected one by one according to the air gap sequence Values are noted in the discrete flux linkage-ammeter; Determining the position of the point to be detected in the discrete flux linkage-ampere meter (1) Energizing a brake coil to be detected and recording a coil voltage u and a coil current i; (2) Specifying a specific current point i p of the brake to be detected, finding out time t ip of i p , and calculating a flux linkage ψ p corresponding to the time t ip : (3) Finding the position of the p (i p ,Ψ p ) point in the discrete flux linkage-ampere meter, determining the data of four adjacent points surrounding the p (i p ,Ψ p ) point ：a(i 1 ,Ψ a ),b(i 2 ,Ψ b ),c(i 1 ,Ψ c ),d(i 2 ,Ψ d ) (4) The lower limit air gap x 1 is determined by points a, b, and the upper limit air gap x 2 is determined by points c, d; Step five, calculating the air gap of the detection point according to the data of the four adjacent points and the upper and lower limit air gaps By means of Calculating the ratio t i of the p point on the ab line segment according to the formula (1); calculating flux linkage interpolation data psi e of the p point on the ab line segment according to the ratio t i by using a formula (2) of psi e ＝(1-t i )ψ a +t i ψ b ; Calculating flux linkage interpolation data psi f of the p point on the cd line segment according to the ratio t i by using a formula (3) of psi f ＝(1-t i )ψ c +t i ψ d ; by means of Calculating the ratio t Ψ of the p point on the ef line segment according to the formula (4); interpolation data x p for the detection point air gap between the lower limit air gap x 1 and the upper limit air gap x 2 is calculated by the ratio t Ψ using x p ＝(1-t ψ )x 1 +t ψ x 2 .

Description

Electromagnetic brake air gap distance detection method Technical Field The invention relates to the technical field of electromagnetic brake detection, in particular to an electromagnetic brake air gap distance detection method. Background Electromagnetic brakes are extremely important safety protection devices in hoisting equipment such as elevators, and directly affect the safe operation of the equipment such as elevators. The electromagnetic brake comprises an armature, a static plate and a coil. The electromagnetic brake without the monitoring and early warning device is connected with the upper computer control system through a coil circuit. The armature travel, i.e., the distance between the armature face and the stationary plate face, is referred to as the air gap. When the coil is electrified, the armature is attracted to the static plate under the action of electromagnetic force, the air gap is 0 after the brake is attracted, and when the coil is disconnected, the armature is reset under the action of the spring, and the brake is released, namely, the brake is braked, and at the moment, the air gap is maximum. The size of the air gap is the most important parameter of the running state of the electromagnetic brake, and the air gap of the electromagnetic brake needs to be monitored frequently in order to ensure the safe running of hoisting equipment such as elevators. The current common monitoring means is that a micro switch is arranged at the position of an armature, the monitoring of the action state of the armature can only be realized, the air gap position and the action distance of an electromagnetic brake cannot be quantitatively monitored, meanwhile, the travel of the armature is small and is generally not more than 0.5mm or even smaller, and the micro switch cannot be reliably operated, so that the reliability of a monitoring device adopting the micro switch is not high. The change of the size of the air gap of the electromagnetic brake directly reflects the abrasion condition of the brake. If the clearance is too large, the abrasion is serious, and the elevator is dangerous due to out-of-control. The existing detection method is to forcedly stipulate that the abrasion loss of the brake must be checked manually every 15 days, the abrasion is seriously and timely replaced, the detection efficiency is low, and the difficulty is high. The application provides a method and a device for monitoring and early warning the real-time state of an electromagnetic brake in a patent document with the publication number of CN 113865476A. Disclosure of Invention The invention aims to provide an electromagnetic brake air gap distance detection method, which solves the problems of low manual detection efficiency and high difficulty in the existing electromagnetic brake air gap distance detection process. The method realizes automatic detection and early warning of the brake clearance by establishing an electromagnetic brake magnetic chain table and calculating a table lookup. The technical scheme adopted by the invention is that the electromagnetic brake air gap distance detection method comprises the following steps: Step one, collecting data Fixing the electromagnetic brake armature according to the calibration positions to form air gap positions corresponding to the calibration positions, electrifying a brake coil, and sequentially recording the coil voltage u and the coil current i of each calibration air gap; step two, calculating a flux linkage curve corresponding to each air gap by a flux linkage calculation formula The coil voltage u and coil current i recorded for each air gap calculate the flux linkage according to the following formula Wherein R is the resistance of the brake coil, and t is the sampling time; step three, establishing a discrete flux linkage-ammeter (1) Equidistant setting a plurality of discrete current points i k＝{i1,i2,…,im for the brake current; (2) The flux links corresponding to the discrete currents i k are linked one by one according to the air gap sequence Values are noted in the discrete flux linkage-ammeter; Determining the position of the point to be detected in the discrete flux linkage-ampere meter (1) Energizing a brake coil to be detected and recording a coil voltage u and a coil current i; (2) Specifying a specific current point i p of the brake to be detected, finding out time t ip of i p, and calculating a flux linkage ψ p corresponding to the time t ip: (3) Finding the position of the p (i p,Ψp) point in the discrete flux linkage-ampere meter, determining the data of four adjacent points surrounding the p (i p,Ψp) point ：a(i1,Ψa),b(i2,Ψb),c(i1,Ψc),d(i2,Ψd) (4) The lower limit air gap x 1 is determined by points a, b, and the upper limit air gap x 2 is determined by points c, d; Step five, calculating the air gap of the detection point according to the data of the four adjacent points and the upper and lower limit air gaps By means ofCalculating the ratio t i of