CN104316770A - On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine - Google Patents
On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine Download PDFInfo
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- CN104316770A CN104316770A CN201410580233.3A CN201410580233A CN104316770A CN 104316770 A CN104316770 A CN 104316770A CN 201410580233 A CN201410580233 A CN 201410580233A CN 104316770 A CN104316770 A CN 104316770A
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- traction machine
- frequency converter
- asynchronous motor
- elevator traction
- asynchronous
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Abstract
The invention discloses an on-line asynchronous motor stator resistance measurement method and device of a frequency converter special for an elevator traction machine. The method comprises the steps of firstly measuring output current and output voltage of the frequency converter special for the elevator traction machine when the frequency converter special for the elevator traction machine conducts initial excitation on an asynchronous motor stator; then performing calculation to obtain resistance of the asynchronous motor stator according to the output current and output voltage. The on-line asynchronous motor stator resistance measurement method and device is simple, practical and high in measurement accuracy.
Description
Technical field
The present invention relates to a kind of method of stator resistance of asynchronous motor, particularly relate to a kind of method of elevator traction machine special converter on-line measurement stator resistance of asynchronous motor.
The invention still further relates to a kind of device of elevator traction machine special converter on-line measurement stator resistance of asynchronous motor.
Background technology
In actual use, when asynchronous motor stator electric current adopts conventional PID controller, the mathematical model accurately measuring motor is needed.Traditional measurement scheme has two kinds: one to be off-line measurement, then by data stored in system; Two is real-time online measurings.Wherein, the first measurement scheme, although system architecture is simple, program is succinct, and efficiency is high, and the change of motor temperature can affect the actual numerical value of stator resistance, and then can have an impact to control effects; First scheme, resistance value measures in real time, although do not have the impact of temperature, needs frequency converter to apply extra excitation, can produce certain impact like this on the operational efficiency of frequency converter, simultaneously software algorithm also relative complex.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of simple, practical, and the method for the higher elevator traction machine special converter on-line measurement stator resistance of asynchronous motor of measuring accuracy.
For solving the problems of the technologies described above, the invention provides a kind of method of elevator traction machine special converter on-line measurement stator resistance of asynchronous motor, it is characterized in that, the method comprises:
First, when elevator traction machine special converter carries out initial excitation to asynchronous machine stator, measure output current and the output voltage of described terraced traction machine special converter;
Then, the resistance of asynchronous machine stator is calculated according to described output current and described output voltage.
The time of described initial excitation is 200-500ms.
A device for elevator traction machine special converter on-line measurement stator resistance of asynchronous motor, comprises elevator main control module, frequency converter, operation contactor, asynchronous machine and band brake apparatus;
Described elevator main control module, for transmitting control signal respectively to described frequency converter, described operation contactor and described band brake apparatus;
Described frequency converter, for by described operation contactor to described asynchronous machine generation control signal, and send status information to described elevator main control module;
Described band brake apparatus, is connected with described asynchronous machine, for braking described asynchronous machine.
Compared with prior art, beneficial effect of the present invention is: because the present invention directly measures output current and the voltage of elevator traction machine special converter when initial excitation, thus the resistance of asynchronous machine stator is tried to achieve according to R=U ∕ I, first, without the need to increasing extra hardware cost and software overhead, only need to complete measurement before excitation time terminates, and try to achieve resistance according to R=U/I, the shortcoming of case off-line measurement can be solved.Secondly, temperature variation due to motor is a large inertia link, its time constant will be far longer than elevator traction machine special converter separate run times, so in the single run of whole elevator traction machine special converter, the change of stator resistance is negligible.So to measure and the resistance of the asynchronous machine stator calculated is comparatively accurate, and do not need again to increase extra excitation, do not need complicated software algorithm yet.Therefore the present invention is simple, practical, and measuring accuracy is higher.
Accompanying drawing explanation
Fig. 1 is the process schematic of elevator uptime.
Fig. 2 is structured flowchart of the present invention.
Fig. 3 is the isoboles in asynchronous machine excitation time.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.
Shown in Figure 1, the operation sequential of elevator traction machine special converter is: excitation time 200-500ms, switching-off time 200ms, run that elevator acceleration and deceleration curves is no more than 60s, elevator puts in place, barrier gate time 200ms, end of run.
From the operation sequential of above-mentioned elevator traction machine special converter, in excitation time, elevator traction machine special converter can carry out initial excitation to the stator of asynchronous machine, and excitation time is 200-500ms.Now, the rotor of asynchronous machine is fixed by contracting brake, rotor transfixion.Now be convenient to measure, method based on this elevator traction machine special converter on-line measurement stator resistance of asynchronous motor of the present invention is: first, when elevator traction machine special converter carries out initial excitation to asynchronous machine stator, measure output current I and the output voltage U of terraced traction machine special converter according to means well known in the art; Then, the resistance of asynchronous machine stator is calculated according to output current I and output voltage U, it is concrete before excitation time terminates, the equivalent mathematical model of asynchronous motor as shown in Figure 3, now asynchronous motor is equivalent to pure resistive loads, therefore, the stator resistance of asynchronous motor can be tried to achieve according to Ohm law R=U/I.
For realizing method of the present invention, shown in Figure 2, the present invention also provides a kind of device of elevator traction machine special converter on-line measurement stator resistance of asynchronous motor, comprises elevator main control module 2, frequency converter 4, runs contactor 6, asynchronous machine 8 and band brake apparatus 10;
Elevator main control module 2 and frequency converter 4, run contactor 6 and be connected with band brake apparatus 10, for respectively to frequency converter 4, run contactor 6 and band brake apparatus 8 transmits control signal;
Frequency converter 4 and elevator main control module 2 with run contactor 6 and be connected, for there is control signal by running contactor 6 to asynchronous machine 8, and send status information to elevator main control module 2;
Band brake apparatus 10 is connected with asynchronous machine 8 with elevator main control module 2, for braking asynchronous machine 8.
Claims (3)
1. a method for elevator traction machine special converter on-line measurement stator resistance of asynchronous motor, it is characterized in that, the method comprises:
First, when elevator traction machine special converter carries out initial excitation to asynchronous machine stator, measure output current and the output voltage of described terraced traction machine special converter;
Then, the resistance of asynchronous machine stator is calculated according to described output current and described output voltage.
2. method according to claim 1, is characterized in that: the time of described initial excitation is 200-500ms.
3. a device for elevator traction machine special converter on-line measurement stator resistance of asynchronous motor, is characterized in that, comprises elevator main control module, frequency converter, operation contactor, asynchronous machine and band brake apparatus;
Described elevator main control module, for transmitting control signal respectively to described frequency converter, described operation contactor and described band brake apparatus;
Described frequency converter, for by described operation contactor to described asynchronous machine generation control signal, and send status information to described elevator main control module;
Described band brake apparatus, is connected with described asynchronous machine, for braking described asynchronous machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410580233.3A CN104316770A (en) | 2014-10-27 | 2014-10-27 | On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410580233.3A CN104316770A (en) | 2014-10-27 | 2014-10-27 | On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104316770A true CN104316770A (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410580233.3A Pending CN104316770A (en) | 2014-10-27 | 2014-10-27 | On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine |
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Citations (5)
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| CN101430358A (en) * | 2008-12-10 | 2009-05-13 | 河南国网宝泉抽水蓄能有限公司 | Head-machine first water pump behavior full-group start test method for pump storage plant |
| CN101610063A (en) * | 2009-06-24 | 2009-12-23 | 北京利德华福电气技术有限公司 | A kind of high voltage converter and control method thereof of utilizing inverter carrying out soft excitation |
| CN102661812A (en) * | 2012-05-15 | 2012-09-12 | 无锡艾柯威科技有限公司 | Method for improving temperature detection precision of motor winding |
| CN102751933A (en) * | 2012-07-03 | 2012-10-24 | 常熟开关制造有限公司(原常熟开关厂） | Motor torque boosting device |
| CN103464710A (en) * | 2012-06-08 | 2013-12-25 | 宝山钢铁股份有限公司 | Control method for keeping insertion position of dummy bar |
-
2014
- 2014-10-27 CN CN201410580233.3A patent/CN104316770A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101430358A (en) * | 2008-12-10 | 2009-05-13 | 河南国网宝泉抽水蓄能有限公司 | Head-machine first water pump behavior full-group start test method for pump storage plant |
| CN101610063A (en) * | 2009-06-24 | 2009-12-23 | 北京利德华福电气技术有限公司 | A kind of high voltage converter and control method thereof of utilizing inverter carrying out soft excitation |
| CN102661812A (en) * | 2012-05-15 | 2012-09-12 | 无锡艾柯威科技有限公司 | Method for improving temperature detection precision of motor winding |
| CN103464710A (en) * | 2012-06-08 | 2013-12-25 | 宝山钢铁股份有限公司 | Control method for keeping insertion position of dummy bar |
| CN102751933A (en) * | 2012-07-03 | 2012-10-24 | 常熟开关制造有限公司(原常熟开关厂） | Motor torque boosting device |
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Application publication date: 20150128 |