CN100458397C - Apparatus for measuring simultaneously vibration and rotation speed of traction motor and method thereof - Google Patents

Abstract

An apparatus for simultaneously measuring vibration and rotational speed of a traction motor is disclosed. The device for simultaneously measuring the vibration and rotational speed of the traction motor includes a rotational speed sensor installed on the traction motor, a frequency/speed converter for converting the pulse frequency transmitted from the rotational speed sensor into a rotational speed value, and a rotational speed A/D converter for converting the The rotational speed value transmitted from the frequency/speed converter is converted into a digital value, the vibration sensor is used to measure the vibration of the traction motor, the vibration A/D converter is used to convert the vibration value transmitted from the vibration sensor into a digital value, buffer for simultaneously storing the digital values of rotation speed and vibration transmitted from the rotation and vibration A/D converter, the controller for reading the digital values of rotation speed and vibration stored in the cache memory, storing the digital values and reading Take the time of the digital value, and simultaneously display the rotation speed and vibration value stored in the storage unit according to the display signal transmitted from the key input unit, and the display unit is used to display the displayed value according to the display control signal of the controller. The measured rotational speed and vibration values, and the key input unit are used to input instructions and data to the controller. Thus, rotational speed and vibration values can be displayed simultaneously. Since vibrations at specific speeds can be precisely measured, vibration graphs against rotational speed can be analyzed precisely.

Description

Apparatus and method for simultaneously measuring vibration and rotational speed of a traction motor

technical field

The invention relates to a device and method for simultaneously measuring the vibration and rotation speed of a traction motor. More specifically, the present invention relates to an apparatus and method for simultaneously measuring vibration and rotational speed of a traction motor, wherein a vibration sensor and a rotational speed sensor are mounted on the traction motor, and respective values detected from the two sensors are simultaneously stored on the buffer, and read the stored value, so that the vibration and rotation speed measured simultaneously can be displayed.

Background technique

Traction motors, which provide propulsion for electric locomotives, generate torque through electromagnetic forces applied to conductors through which current flows in a magnetic field. The torque of the traction motor induces vibrations, and such vibrations have a negative effect on stability and ride comfort.

Therefore, the vibration at each speed is measured before loading the traction motor on the locomotive. During the test, the traction motor was rotated at a predetermined speed. Speed is inversely proportional to load current, while torque is directly proportional to load current. Therefore, the speed always fluctuates when the current is unstable.

Moreover, in the prior art, in order to measure the rotation speed and vibration of the traction motor, the tachometer 3 and the vibration meter 4 shown in FIG. 1 are used. In the tachometer 3, a speed sensor mounted on the rotating shaft of the traction motor 1 generates intermittent optical signals through the rotation of the rotating shaft. The signal is converted into pulses and the frequency of the pulses produces the speed to be displayed on the tachometer.

In the same way, the vibration meter 4 receives vibration signals from the vibration sensors 2 installed on the upper/lower, left/right, front/rear parts of the traction motor 1 and displays its value on the monitor. According to the prior art, the observer reads the velocity value displayed on the monitor and at the same time the observer has to read the vibration value displayed on the monitor.

In the prior art, the observer scans the respective monitors of the speedometer and the vibration meter with the naked eyes of the observer, and records the speed and vibration values. This has the problem that an accurate vibration value corresponding to a certain speed value cannot be obtained because there is a gap in the reading time of the speed and the vibration.

Contents of the invention

Therefore, the present invention focuses on the above-mentioned problems arising in the prior art, and an object of the present invention is to provide an apparatus and method for simultaneously measuring the vibration and rotational speed of a traction motor, in which the rotation corresponding to the traction motor can be precisely measured Velocity vibration value.

Another object of the present invention is to provide a device and method for simultaneously measuring the vibration and rotational speed of a traction motor, each rotational speed and vibration of the traction motor are measured, and the measured values are simultaneously stored in a cache memory together with the measurement time , and can display all values at the same time.

In order to achieve the above object, the apparatus for simultaneously measuring the vibration and rotational speed of the traction motor includes: a rotational speed sensor mounted on the traction motor; a frequency/speed converter for converting the pulse frequency transmitted from the rotational speed sensor into rotational speed value; rotational speed analog/digital (A/D) converter for converting the rotational speed value transmitted from said frequency/speed converter into a digital value; vibration sensor for measuring the vibration of the traction motor; vibration A/D conversion A device for converting the vibration value transmitted from the vibration sensor into a digital value; a buffer for simultaneously storing the digital value of the rotational speed and the vibration transmitted from the rotation and vibration A/D converter; a controller for reading the digital values of rotation speed and vibration stored in the buffer memory, storing the digital values and the time at which the digital values were read, and simultaneously displaying the digital values stored on the storage unit according to the display signal transmitted from the key input unit. rotational speed and vibration values; a display unit for displaying the measured rotational speed and vibration values according to a display control signal of the controller; and a key input unit for inputting instructions and data to the controller.

Also, the buffer includes two parallel shift registers, and each register stores the data transmitted from the rotational speed A/D converter or vibration A/D converter according to a clock signal (CLK) transmitted from the controller. data and data transmitted from the vibration A/D converter or rotational speed A/D converter.

Also, the controller transmits a control signal having the same frequency as the sampling frequency of the rotational speed and vibration A/D converters to the parallel shift register as a clock signal, and the controller transmits to the parallel shift register with The same frequency as the sampling frequency stores the digital values of the rotational speed and the vibration into the storage unit.

In the method of simultaneously measuring the vibration and rotation speed of the traction motor, the method includes the steps of: confirming whether a storage key is input from the key input unit; writing the storage start time when the storage key is input, and reading the rotational speed and the vibration from the buffer data, and stored to the storage unit; after storing the rotational speed and vibration data, write the storage end time; and when a display instruction is input from the key input unit, it is determined whether the time is input, and if the time is input, then display RPM and vibration data corresponding to the time entered.

Description of drawings

The above and other objects, features and advantages of the present invention can be more clearly understood through the following detailed description in conjunction with the accompanying drawings, wherein:

Figure 1 is a schematic representation of a device for measuring vibrations of a traction motor according to the prior art;

Fig. 2 is the structure diagram of the device for simultaneously measuring the vibration and the rotational speed of the traction motor according to the present invention;

Figure 3 is a structural diagram showing the composition of the cache; and

FIG. 4 is a flowchart showing a method of simultaneously measuring vibration and rotation speed of a traction motor according to the present invention.

Detailed ways

The present invention will now be further described by way of example embodiments with reference to the accompanying drawings.

Figure 2 shows a block diagram of a device that simultaneously measures the vibration and rotational speed of a traction motor.

The equipment for simultaneously measuring the vibration and rotational speed of the traction motor includes: a rotational speed sensor 12 installed on the traction motor 10; a frequency/speed converter 14 for converting the pulse frequency transmitted from the rotational speed sensor 12 into a rotational speed value; the rotational speed A/ D converter 15, is used for converting the rotating speed value transmitted from frequency/speed converter 14 into digital value; Vibration meter 13, is used for measuring the vibration of traction motor 10; The vibration value transmitted by the meter 13 is converted into a digital value; the cache memory 17 is used to store the digital value of the rotational speed and vibration transmitted from the rotational speed A/D converter 15 and the vibration A/D converter 16 simultaneously; the controller 18 is used for reading Get the digital value of the rotational speed and vibration stored in the cache memory 17, store the digital value and time on the storage unit 19, and simultaneously display the rotational speed and vibration stored on the storage unit 19 according to the display signal transmitted from the key input unit 21 vibration value; a display unit 20 for displaying the measured rotational speed and vibration value according to a display control signal of the controller 18; and a key input unit 21 for inputting instructions and data to the controller.

The traction motor 10 is installed on the floor of the locomotive, and each vibration sensor 11 is installed at front/rear, left/right, and upper/lower portions of the traction motor 10 . The vibration signals detected by the respective vibration sensors 11 are transmitted to the vibration meter 13 to calculate the average value of the signals. The average value is output to the vibration A/D converter 16 . At the vibration A/D converter 16 , the input analog value is converted into a digital value, and the digital value is output to the buffer memory 17 .

On the other hand, the rotation speed sensor 12 mounted on the rotation shaft of the traction motor 6 generates pulses according to the rotation speed of the rotation shaft. The pulses generated at the rotational speed sensor 12 are transmitted to a frequency/speed converter 14 . The pulse frequency is converted to a speed value at a frequency/speed converter 14 . At the rotational speed A/D converter 15 , the analog value sent from the frequency/speed converter 14 is converted into a digital value, and the digital value is output to the buffer memory 17 .

The buffer memory 17 stores respective digital data of speed and vibration transmitted from the rotational speed A/D converter 15 or the vibration A/D converter in accordance with a control signal received from the controller 18 . The cache memory 17 includes two parallel shift registers 31, 32 (FIG. 3), and each register stores the data from the rotational speed A/D converter 15 or the vibration A/D converter according to the clock signal (CLK) transmitted from the controller 18. 16 and data transmitted from the vibration A/D converter 16 or the rotational speed A/D converter 15.

The controller 18 transmits a control signal to the parallel shift registers 31 , 32 as a clock signal, and the control signal has the same frequency as the sampling frequency of the rotational speed A/D converter 15 and the vibration A/D converter 16 . The controller 18 stores the digital data of the rotational speed and the vibration to the storage unit 19 at the same frequency as the sampling frequency.

Therefore, the respective sampling frequencies generated from the rotational speed A/D converter 15 and the vibration A/D converter 16 are the same as or greater than the frequency of the control signal.

Otherwise, if the frequency of the control signal is greater than the frequency of each A/D converter, the same data as the previous data may be read without performing the next sampling. Hence the error.

The controller 18 reads the respective speed and vibration data stored on the buffer memory 17 and stores the data on the storage unit 19 . At this time, the time read together with the speed and vibration data is also stored on the storage unit 19 . Therefore, it is possible to display data value changes of speed and vibration according to time changes.

For example, when the rotational speed of the traction motor 10 increases from 3000 rpm to 4000 rpm within one minute, the changed state of the vibration may be stored on the storage unit 19 .

The observer can input display instructions to the controller 18 using the key input unit 21 . The controller 18 having received the display instruction displays the vibration change state stored on the storage unit 19 . For example, if the rotation speed of the traction motor 10 is increased from 3000 rpm to 4000 rpm within one minute, the vibration state change within the speed change period can be displayed.

On the other hand, when the observer inputs the time and display instructions to view the changed state at a certain point in time, for example, 20 seconds to 40 seconds within the above-mentioned 1 minute, the controller 18 displays this period of time (20 seconds to 40 seconds) second) the rotating speed and vibration of the traction motor 10.

FIG. 4 shows a flowchart of a method for simultaneously measuring vibration and rotation speed of a traction motor according to the present invention.

The controller 18 confirms whether a store key is input from the key input unit 21 (S1). If the storage key is input, the storage start time is written (S2). The controller 18 reads rotational speed data from the first parallel shift register 31 of the buffer 17, reads vibration data from the second parallel shift register 32 of the buffer 17, and stores both data into the storage unit (S3).

The buffer memory 17 includes a first parallel shift register 31 storing rotational speed data and a second parallel shift register 32 storing vibration data. The rotational speed data are thus read from the first parallel shift register 31 and stored in the memory unit 19 . Thereafter, vibration data is read from the second parallel shift register 32 and stored on the storage unit 19 . The order may not be permanently fixed. On the contrary, the vibration data can be read first, and then the rotation speed data can be read, so that the same effect as the aforementioned sequence can be obtained.

The data of rotation speed and vibration are stored and written in the storage end time (S4). Thereafter, the controller determines whether a display instruction is input from the key input unit 21 (S5). If no display command is input, return to step S1.

On the other hand, if a display instruction is input, the controller determines whether a time is input (S6). If no time is entered, the rotational speed and vibration data are simultaneously displayed on the display unit (S7). On the other hand, if the time is input, the rotational speed and vibration data corresponding to the input time are displayed on the display unit (S8).

Industrial applicability

According to the present invention, the cache can simultaneously store the rotational speed and vibration values measured at the rotational speed sensor and the vibration sensor. The stored data is further stored on the storage unit, and the rotational speed and vibration values are simultaneously displayed. Therefore, since the vibration at a specific speed can be precisely measured, a graph of vibration versus rotational speed can be accurately analyzed.

Claims (4)

1. A device for simultaneously measuring vibration and rotational speed of a traction motor, said device comprising: The rotational speed sensor (12) that is installed on the traction motor (10); a frequency/speed converter (14), used to convert the pulse frequency transmitted from the rotational speed sensor (12) into a rotational speed value; A rotational speed A/D converter (15) for converting the rotational speed value transmitted from the frequency/speed converter (14) into a digital value; Vibration meter (13), used to measure the vibration of traction motor (10); a vibration A/D converter (16) for converting the vibration value transmitted from the vibrating meter (13) into a digital value; buffer memory (17), for simultaneously storing the digital value of the rotational speed and the vibration transmitted from the rotational speed A/D converter (15) and the vibration A/D converter (16); The controller (18) is used to read the digital values of the rotational speed and the vibration stored in the cache memory (17), store the digital values and the time of reading the digital values, and transmit The display signal of the display signal while displaying the rotational speed and the vibration value stored on the storage unit (19); a display unit (20) for displaying the measured rotational speed and vibration values according to the display control signal of the controller (18); and A key input unit (21), used for inputting instructions and data to the controller (18). 2. The device for simultaneously measuring the vibration and rotational speed of a traction motor according to claim 1, wherein said buffer (17) includes two parallel shift registers, and each register is based on the clock transmitted from the controller (18) signal to store the data transmitted from the rotational speed A/D converter (15) or the vibration A/D converter (16) and the data transmitted from the vibration A/D converter (16) or the rotational speed A/D converter (15) . 3. The device for simultaneously measuring the vibration and rotational speed of a traction motor according to claim 2, wherein said controller (18) transmits a control signal as a clock signal to said two parallel shift registers, and said control The signal has the same frequency as the sampling frequency of the rotational speed A/D converter (15) and the vibration A/D converter (16), and the controller (18) stores the digital data of the rotational speed and vibration at the same frequency as the sampling frequency to storage unit (19). 4. A method for simultaneously measuring the vibration and rotational speed of a traction motor, said method comprising the steps of: Confirm whether the storage key (S1) has been input from the key input unit (21); Write storage start time (S2) when inputting storage key, read speed and vibration data from buffer memory, and store to storage unit (19) (S3); Write storage end time (S4) after storing rotational speed and vibration data; and When a display instruction is input from the key input unit (21), it is determined whether time is input (S6), and if time is input, rotational speed and vibration data corresponding to the input time are displayed (S8).

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