Elevator fault diagnosis method
A fault diagnosis, elevator technology, applied in the field of elevator fault diagnosis
Active Publication Date: 2019-06-14
SHANGHAI MITSUBISHI ELEVATOR CO LTD
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0010] The technical problem to be solved by the present invention is to provide a fault diagnosis method for elevators, which can simply, quickly and effectively detect elevator faults caused by the decline in the quality of the output signal of the elevator encoder
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] The present invention provides a fault diagnosis method for an elevator. By calculating and analyzing the pulse interval of the square wave output by the encoder, it can be inferred whether the encoder of the elevator installed on the site has a decline in the output signal quality due to environmental problems, such as figure 2 , image 3 As shown, it specifically includes the following steps:
[0022] In the first step, the motor control system drives the elevator to run in any direction;
[0023] In the second step, when the elevator is running at a constant speed, the elevator control system detects the square wave signal output by the encoder, and calculates all the pulse intervals of the square wave signal to obtain the pulse interval sequence a 1 、a 2 ,...a n ;
[0024] The third step is to calculate the pulse inte...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an elevator fault diagnosis method. The elevator fault diagnosis method comprises the following steps that step 1, a motor control system drives an elevator to run in any direction; step 2, when the elevator runs at a constant speed, the elevator control system detects square wave signals output by an encoder, and calculates all pulse intervals of the square wave signals toobtain a pulse interval sequence; and step 3, the average value of the pulse interval sequence, the percentage of the pulse intervals larger than an upper limit threshold value of the pulse intervalsand the percentage of the pulse intervals smaller than a lower limit threshold value of the pulse intervals are calculated, if the sum of the two percentages is greater than the set threshold value,it is determined that a problem exists in the output signals of the encoder of the elevator, and the elevator control system issues a fault signal. The elevator fault diagnosis method analyzes the pulse intervals of the output square wave by using a data analysis method, reverses whether the adopted encoder in the elevator has the problem that the output signal quality is degraded due to environmental problems or not, and then quickly and effectively judges whether the elevator is faulty or not.
Description
technical field [0001] The invention relates to the field of elevators, in particular to a method for diagnosing elevator faults caused by encoders. Background technique [0002] In the motor control method of the elevator, the running speed is an important basis and index, and the running speed of the elevator usually needs to be obtained by installing an encoder on the motor. Currently, the commonly used encoders include photoelectric encoders and magnetic encoders. [0003] For optical encoders, such as figure 1 As shown, if the slits of the two gratings in the photoelectric encoder are aligned, the light will pass through completely. If the lines of one grating are exactly opposite the slits of the other, light cannot pass through. The light intensity changes in the form of triangular waves, and the photoelectric unit converts these changes in light intensity into electrical signals close to sinusoidal. From the signal generation principle of the above-mentioned photo...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): B66B5/00
Inventor 张筱何晓光季荣斌
Owner SHANGHAI MITSUBISHI ELEVATOR CO LTD