CN113281651A - Method for rapidly measuring back electromotive force coefficient of synchronous traction machine - Google Patents

Method for rapidly measuring back electromotive force coefficient of synchronous traction machine Download PDF

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Publication number
CN113281651A
CN113281651A CN202110612260.4A CN202110612260A CN113281651A CN 113281651 A CN113281651 A CN 113281651A CN 202110612260 A CN202110612260 A CN 202110612260A CN 113281651 A CN113281651 A CN 113281651A
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measuring
tractor
electromotive force
traction machine
back electromotive
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毛强
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Hangzhou Changniu Technology Co ltd
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Hangzhou Changniu Technology Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34Testing dynamo-electric machines
    • G01R31/343Testing dynamo-electric machines in operation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts
    • G01M13/02Gearings; Transmission mechanisms
    • G01M13/025Test-benches with rotational drive means and loading means; Load or drive simulation

Abstract

The invention discloses a method for rapidly measuring a back electromotive force coefficient of a synchronous traction machine, which comprises the following steps: preparing equipment: preparing an ohmmeter, a voltmeter and an ammeter, and manufacturing a rotating speed measuring device; measuring the resistance value: measuring the armature resistance value of the tractor by using a resistance meter; measuring voltage, current and rotation speed: and applying rated voltage to the tractor to enable the tractor to run in a no-load mode. Has the advantages that: the counter potential coefficient of the tractor can be measured quickly by using the simple and easy-to-use instruments such as the encoder, the ohmmeter, the voltmeter and the ammeter, so that the operation is convenient, the counter potential coefficient is very quick, different tractors can be measured continuously, the counter potential coefficient measuring device can be suitable for measuring the counter potential coefficient of the large-batch tractor, the measuring efficiency and the measuring precision can be greatly improved from the part, the height of the encoder can be adjusted according to the height of the tractor, and the counter potential coefficient measuring device can be suitable for measuring different tractors.

Description

Method for rapidly measuring back electromotive force coefficient of synchronous traction machine
Technical Field
The invention relates to the technical field of traction machine parameter measurement, in particular to a method for quickly measuring a back electromotive force coefficient of a synchronous traction machine.
Background
The elevator traction machine is power equipment of an elevator, and is also called an elevator main machine. The function is to transport and transmit power to run the elevator. It is composed of motor, brake, coupling, speed reducer, traction wheel, machine frame, guide wheel and auxiliary handwheel. The guide wheels are typically mounted on the frame or on a load beam below the frame. Some of the barring hand wheels are fixed on the motor shaft, and also hung on a nearby wall at ordinary times, and then sleeved on the motor shaft when in use.
There are many parameters in the design and use of a traction machine, among which the back emf coefficient is an important indicator that is related to the performance of the motor and the correct design of the controller. Therefore, after the tractor is manufactured, the counter electromotive force coefficient of the tractor needs to be accurately measured, but in the prior art, the counter electromotive force coefficient measuring method of the tractor is troublesome, and the measuring error is large.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention aims to provide a method for rapidly measuring the back electromotive force coefficient of a synchronous traction machine, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for rapidly measuring the back electromotive force coefficient of a synchronous traction machine comprises the following steps:
preparing equipment: preparing an ohmmeter, a voltmeter and an ammeter, and manufacturing a rotating speed measuring device;
measuring the resistance value: measuring the armature resistance value of the tractor by using a resistance meter;
measuring voltage, current and rotation speed: adding rated voltage on the tractor to enable the tractor to run in a no-load mode, respectively measuring armature voltage and armature current of the tractor by using a voltmeter and an ammeter, and measuring the rotating speed of the tractor by using a rotating speed measuring device;
calculating a back emf coefficient: and calculating the counter potential coefficient according to a measurement formula.
Furthermore, the rotating speed measuring device comprises a bottom plate, a mounting seat, a display screen and a processor are fixedly arranged at one end of the bottom plate, a hydraulic cylinder is fixedly arranged on the mounting seat, an encoder is fixedly arranged on a piston rod of the hydraulic cylinder, a measuring shaft is fixedly arranged in the middle of the encoder, a mounting disc is fixedly arranged at one end of the measuring shaft, a plurality of process grooves are formed in the mounting disc at equal intervals along the circumferential direction, the encoder and the display screen are electrically connected with the processor, and an operation module is arranged in the processor and can calculate the rotating speed of the tractor according to the measured value of the encoder and display the rotating speed on the display screen.
Further, during measurement, the tractor to be measured is fixed on the bottom plate through bolts, and the mounting disc is fixedly connected with the traction sheave of the tractor to be measured through a plurality of bolts, so that the tractor can drive the measuring shaft to synchronously rotate.
Further, the above measurement formula is:
Figure BDA0003097420850000021
wherein, KeAnd the back electromotive force coefficient is U, the armature voltage is I, the armature current is I, the armature resistance is R, and the rotating speed of the tractor is n.
Furthermore, an input panel is fixedly arranged on the bottom plate and electrically connected with the processor.
Furthermore, the measured values of the armature voltage, the armature current and the armature resistance are input into the processor through the input panel, and the counter electromotive force coefficient can be automatically calculated by the processor according to a formula and displayed on the display screen.
Compared with the prior art, the invention has the following beneficial effects: the counter potential coefficient of the tractor can be measured quickly by using the simple and easy-to-use instruments such as the encoder, the ohmmeter, the voltmeter and the ammeter, so that the operation is convenient, the counter potential coefficient is very quick, different tractors can be measured continuously, the counter potential coefficient measuring device can be suitable for measuring the counter potential coefficient of the large-batch tractor, the measuring efficiency and the measuring precision can be greatly improved from the part, the height of the encoder can be adjusted according to the height of the tractor, and the counter potential coefficient measuring device can be suitable for measuring different tractors.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a method for rapidly measuring a back emf coefficient of a synchronous traction machine according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rotating speed measuring device in a method for rapidly measuring a back electromotive force coefficient of a synchronous traction machine according to an embodiment of the present invention.
Reference numerals:
1. a base plate; 2. a mounting seat; 3. a display screen; 4. a processor; 5. a hydraulic cylinder; 6. an encoder; 7. a measuring shaft; 8. mounting a disc; 9. a process tank; 10. a traction sheave; 11. an input panel.
Detailed Description
The invention is further described with reference to the following drawings and detailed description:
example (b):
referring to fig. 1-2, a method for rapidly measuring a back electromotive force coefficient of a synchronous traction machine according to an embodiment of the present invention includes the following steps:
step S101, equipment preparation: preparing an ohmmeter, a voltmeter and an ammeter, and manufacturing a rotating speed measuring device;
step S103, measuring a resistance value: measuring the armature resistance value of the tractor by using a resistance meter;
step S105, measuring voltage, current and rotating speed: adding rated voltage on the tractor to enable the tractor to run in a no-load mode, respectively measuring armature voltage and armature current of the tractor by using a voltmeter and an ammeter, and measuring the rotating speed of the tractor by using a rotating speed measuring device;
step S107, calculating a back electromotive force coefficient: and calculating the counter potential coefficient according to a measurement formula.
In a further embodiment, the rotating speed measuring device comprises a bottom plate 1, one end of the bottom plate 1 is fixedly provided with a mounting seat 2, a display screen 3 and a processor 4, the mounting seat 2 is fixedly provided with a hydraulic cylinder 5, a piston rod of the hydraulic cylinder 5 is fixedly provided with an encoder 6, the middle part of the encoder 6 is fixedly provided with a measuring shaft 7, one end of the measuring shaft 7 is fixedly provided with a mounting disc 8, the mounting disc 8 is provided with a plurality of process grooves 9 at equal intervals along the circumferential direction, the encoder 6 and the display screen 3 are both electrically connected with the processor 4, and an operation module is arranged in the processor 4 and can calculate the rotating speed of the tractor according to the measured value of the encoder 6 and display the rotating speed on the display screen 3.
In a further embodiment, during measurement, the traction machine to be measured is fixed on the bottom plate 1 through bolts, and the mounting disc 8 is fixedly connected with the traction sheave 10 of the traction machine to be measured through a plurality of bolts, so that the traction machine can drive the measuring shaft 7 to synchronously rotate.
In a further embodiment, the above measurement formula is:
Figure BDA0003097420850000031
wherein, KeAnd the back electromotive force coefficient is U, the armature voltage is I, the armature current is I, the armature resistance is R, and the rotating speed of the tractor is n.
In a further embodiment, an input panel 11 is fixedly disposed on the bottom plate 1, and the input panel 11 is electrically connected to the processor 4.
In a further embodiment, the measured values of armature voltage, armature current and armature resistance are input into the processor 4 through the input panel 11, and the counter electromotive force coefficient can be automatically calculated by the processor 4 according to a formula and displayed on the display screen 3.
Through the scheme of the invention, the counter potential coefficient of the tractor can be rapidly measured by using simple and easy-to-use instruments such as the encoder 6, the resistance meter, the voltmeter and the ammeter, the operation is convenient, the operation is very rapid, different tractors can be continuously measured, the counter potential coefficient measuring device can adapt to the measurement of the counter potential coefficients of a large number of tractors, the measuring efficiency and the measuring precision can be greatly improved from the part, and the height of the encoder 6 can be adjusted according to the height of the tractor, so that the counter potential coefficient measuring device can adapt to the measurement of different tractors.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. A method for rapidly measuring the back electromotive force coefficient of a synchronous traction machine is characterized by comprising the following steps:
preparing equipment: preparing an ohmmeter, a voltmeter and an ammeter, and manufacturing a rotating speed measuring device;
measuring the resistance value: measuring the armature resistance value of the tractor by using a resistance meter;
measuring voltage, current and rotation speed: adding rated voltage on the tractor to enable the tractor to run in a no-load mode, respectively measuring armature voltage and armature current of the tractor by using a voltmeter and an ammeter, and measuring the rotating speed of the tractor by using a rotating speed measuring device;
calculating a back emf coefficient: and calculating the counter potential coefficient according to a measurement formula.
2. The method for rapidly measuring the back electromotive force coefficient of the synchronous traction machine according to claim 1, wherein the rotating speed measuring device comprises a bottom plate, a mounting seat, a display screen and a processor are fixedly arranged at one end of the bottom plate, the processor is connected with a power supply, a hydraulic cylinder is fixedly arranged on the mounting seat, an encoder is fixedly arranged on a piston rod of the hydraulic cylinder, a measuring shaft is fixedly arranged in the middle of the encoder, a mounting disc is fixedly arranged at one end of the measuring shaft, a plurality of process grooves are formed in the mounting disc at equal intervals in the circumferential direction, the encoder and the display screen are both electrically connected with the processor, and an operation module is arranged in the processor and can calculate the rotating speed of the traction machine according to the measured value of the encoder and display the rotating speed on the display screen.
3. The method for rapidly measuring the back electromotive force coefficient of the synchronous traction machine according to claim 2, wherein the traction machine to be measured is fixed on the bottom plate through bolts during measurement, and the mounting plate is fixedly connected with the traction sheave of the traction machine to be measured through a plurality of bolts, so that the traction machine can drive the measuring shaft to synchronously rotate.
4. The method for rapidly measuring the back electromotive force coefficient of the synchronous traction machine according to claim 3, wherein the above measurement formula is:
Figure FDA0003097420840000011
wherein, KeAnd the back electromotive force coefficient is U, the armature voltage is I, the armature current is I, the armature resistance is R, and the rotating speed of the tractor is n.
5. The method for rapidly measuring the back electromotive force coefficient of the synchronous traction machine according to claim 4, wherein an input panel is fixedly arranged on the base plate, and the input panel is electrically connected with the processor.
6. The method for rapidly measuring the back electromotive force coefficient of the synchronous traction machine according to claim 5, wherein the measured values of the armature voltage, the armature current and the armature resistance are inputted into the processor through the input panel, and the processor can automatically calculate the back electromotive force coefficient according to a formula and display the back electromotive force coefficient on the display screen.
CN202110612260.4A 2021-06-02 2021-06-02 Method for rapidly measuring back electromotive force coefficient of synchronous traction machine Pending CN113281651A (en)

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CN206126535U (en) * 2016-10-21 2017-04-26 博玛迅达(许昌)驱动技术有限公司 Hauler rotary encoder's mounting structure
CN107015046A (en) * 2017-03-23 2017-08-04 歌尔股份有限公司 A kind of test device and method of testing of brushless electric machine counter electromotive force
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CN206126535U (en) * 2016-10-21 2017-04-26 博玛迅达(许昌)驱动技术有限公司 Hauler rotary encoder's mounting structure
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CN207827643U (en) * 2017-08-31 2018-09-07 浙江省特种设备检验研究院 A kind of test device of traction machine
CN208156162U (en) * 2018-05-16 2018-11-27 江西精骏电控技术有限公司 A kind of permanent magnet synchronous motor counter electromotive force detection device
CN211669327U (en) * 2019-12-25 2020-10-13 中国第一汽车股份有限公司 Motor back electromotive force measuring device
CN212740287U (en) * 2020-06-17 2021-03-19 重庆工贸职业技术学院 Elevator traction sheave state detection system

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