CN106597281A - No-load parameter detecting device for DC motor - Google Patents
No-load parameter detecting device for DC motor Download PDFInfo
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- CN106597281A CN106597281A CN201611167752.2A CN201611167752A CN106597281A CN 106597281 A CN106597281 A CN 106597281A CN 201611167752 A CN201611167752 A CN 201611167752A CN 106597281 A CN106597281 A CN 106597281A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention provides a no-load parameter detecting device for a DC motor and belongs to the field of motor no-load parameter detection, and solves the inconvenient use of a current switching operation order pallet in special circumstances. The no-load parameter detecting device comprises a frequency-domain signal acquisition module, a motor no-load starting voltage detection module, a motor no-load starting current detection module and a motor no-load speed measuring module. The frequency-domain signal acquisition module converts the operating current of the motor to be detected in a no-load state into a frequency-domain signal. The motor no-load starting voltage detection module and the motor no-load starting current detection module monitor the peak value of the frequency-domain signal. When the peak value exceeds a preset value, the supply voltage and the supply current are the motor no-load starting voltage and the motor no-load starting current respectively. The motor no-load speed measuring module selects the fundamental wave of the frequency-domain signal, reads out the frequency value of the fundamental wave, and obtains the motor no-load speed according to the frequency value and the number of pole pairs of the detected motor. The no-load parameter detecting device has the advantages of fast test speed, high measurement precision and low test error.
Description
Technical field
The present invention relates to a kind of unloaded parameter detection device of motor, more particularly to a kind of direct current based on frequency-domain analysis
Machine zero load parameter detection device, belongs to empty load of motor parameter detecting field.
Background technology
Detection technique is that research and development of products, performance test, production supervision, quality such as supervise at the important ring that all cannot be got around completely
Section.Particularly in recent years, increasing advanced detection technique is applied to the automatic control system in engineering technology, control
The critical positions of system oneself so tightly occupied by detection means.Manual reading instrumented data is adopted at present, then is manually entered
Carry out follow-up data behaviour to do, this mode process is loaded down with trivial details, less efficient.Existing main flow velocity measuring technique is broadly divided into analog and number
Word formula detection method, is divided into following several method substantially：
1st, photoelectric tachometric measurement sensor.By sticking a reflective scraps of paper on motor shaft, by motor and rotation
During reflected impulse, measure rotating speed using laser velocimeter.This method test result is more accurate, but cannot expire
Sufficient remote testing, and it is high to light label paster dependence, and the motor feels hot or the middle paster that runs up easily falls down, and is surveying
The pasted cursor scraps of paper are must be accurately aimed at during amount, the requirement to operator is higher.
2nd, Hall switch part carries out pulse detection.This method may not apply to multiclass motor, because motor size differs, and
The detecting distance of Hall part<1cm, is to meet no load test requirement, and for different motors different frocks are needed, and detects work
Fill it is complex, and in -60 DEG C of ultralow temperature, under the extreme environment that 100 DEG C of high temperature, ordinary magnet failure, the performance to Hall part
Require higher.
3rd, angular encoder tests the speed mode.Using method is to be passed through shaft coupling to be connected with tested motor output shaft,
And rotate simultaneously with tested motor, at the same time angular encoder can continuously output pulse signal, eventually pass and connect down
Sample devices for coming etc. carries out Treatment Analysis and calculates the rotating speed that just can obtain tested motor.This method is negative equivalent to having
Carry, and also cannot use in adverse circumstances.
Various speed-measuring methods described above are all externally measured method, what also a kind of utilization motor was produced when working
Waveform carries out tachometric survey, but is all, to time-domain waveform analysis, to need to be amplified signal, the operation such as shaping.Research has shown that,
Motor is in actual use due to the factors such as rotor fluting, air gap eccentric centre and load concussion, the signal transacting of time domain
It is not simple sine wave, and waveform generation has randomness, is easy to introduce error.
The content of the invention
For the problems referred to above, a kind of test speed of present invention offer is fast, the direct current that certainty of measurement is high and test error is little
The unloaded parameter detection device of machine.
The present invention direct current generator unloaded parameter detection device, the detection means include frequency-region signal acquisition module,
Empty load of motor starts voltage detection module, empty load of motor starting current detection module and empty load of motor rotation speed measuring module；
The frequency-region signal acquisition module, for operating current during empty load of motor to be measured to be converted into into frequency-region signal；
The empty load of motor starts voltage detection module, for being monitored to the peak value of frequency-region signal, when peak value exceedes
During preset value, the supply voltage of detection is empty load of motor and starts voltage；
The empty load of motor starting current detection module, for being monitored to the peak value of frequency-region signal, when peak value exceedes
During preset value, the source current of detection is empty load of motor starting current；
The empty load of motor rotation speed measuring module, for selecting the fundamental wave of frequency-region signal, and reads the frequency of the fundamental wave
Value, according to the frequency values and the number of pole-pairs of tested motor, obtains empty load of motor rotating speed.
Preferably, the detection means also includes generating Reports module；
The autoreport generation module, for the parameter for detecting to be generated into form.
Preferably, the frequency-region signal detection module include current sampling resistor, A/D modular converters, filtration module and
Frequency spectrum modular converter；
The current sampling resistor, for operating current during empty load of motor to be converted into into voltage signal；
The A/D sampling modules, for the voltage signal to be converted into into data signal；
The filtration module, for being filtered to the data signal, obtains filtering signal；
The frequency spectrum modular converter, for the filtering signal to be carried out into Spectrum Conversion, obtains frequency-region signal.
Preferably, the resistance of the current sampling resistor is less than 0.5 Ω.
Preferably, the data line of the A/D sampling modules is twisted-pair feeder.
Preferably, the filtration module using adaptive bandpass filter realize, according to the input voltage for treating measured motor,
To control upper lower limiting frequency.
Preferably, the empty load of motor startup voltage detection module is entered using stabilization comparator to the peak value of frequency-region signal
Row monitoring, effectively monitoring motor false start phenomenon.
The present invention adopts above-mentioned technical proposal, there is provided a kind of direct current generator zero load parameter detecting dress based on frequency-domain analysis
Put, test object includes brshless DC motor and brushed DC motor, with beneficial effect：
1st, present invention achieves the detection of the main zero load parameter of motor, including No Load Start voltage, No Load Start electric current and
No-load speed, particularly, higher for the performance parameter requirement tested typically to no load test of the performance of micromachine, this sets
For in the case where the condition of no load test is met, also can meet to measuring accuracy requirement；
2nd, time domain speed-measuring method is transformed into into frequency domain, the sine wave that waveform is not standard is produced in motor operation course,
Harmonic content is more, if carrying out signal transacting in time domain, the signal transacting step of needs is more, if waveform is transformed into into frequency domain
Afterwards, on the basis of signal processing operations are simplified, harmonic content can be effectively removed, increases measuring accuracy；
3rd, the present invention breaches the no load test technology of brushless electric machine, and brshless DC motor is made using electronically commutating
Judge rotor-position with Hall element, the rotating speed of motor can be calculated using Hall part in theory, but with technology
Development Hall part and associated drives are all embedded in inside brshless DC motor, from the Hall part output letter that outside motor cannot be obtained
Breath；
4th, the present invention has filled up the blank of no load test under extreme environment, and under extreme conditions, photoelectric sensor paster glues
Property decline, most of magnet magnetic disappears, so in the present context cannot be general using the no-load speed detection method in magnetic field；
5th, measuring accuracy of the present invention is high, and speed is fast, and the signal transmssion line that the present invention is adopted is twisted-pair feeder, improves test
Stability.At normal temperatures compared with the test result of electro-optical pickoff, an average fast test result；
6th, the alternative generation testing journal sheet of the present invention, simple to operate, substantially reduces the testing time, improves production week
Phase.It is easy to various measuring instruments or automatic control system directly to utilize.
Description of the drawings
Fig. 1 is the principle schematic of the unloaded parameter detection device of the direct current generator of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the embodiment and the feature in embodiment in the present invention can phase
Mutually combination.
Below in conjunction with the accompanying drawings the invention will be further described with specific embodiment, but not as limiting to the invention.
As shown in figure 1, the unloaded parameter detection device of the direct current generator of present embodiment, including frequency-region signal detection mould
Block, empty load of motor start voltage detection module, empty load of motor starting current detection module and empty load of motor rotation speed measuring module；
Frequency-region signal detection module, for operating current during empty load of motor to be measured to be converted into into frequency-region signal；
Empty load of motor starts voltage detection module, for being monitored to the peak value of frequency-region signal, presets when peak value exceedes
During value, the supply voltage of detection is empty load of motor and starts voltage；
Empty load of motor starting current detection module, for being monitored to the peak value of frequency-region signal, presets when peak value exceedes
During value, the source current of detection is empty load of motor starting current；
Empty load of motor rotation speed measuring module, for selecting the fundamental wave of frequency-region signal, and reads the frequency values of the fundamental wave, root
According to frequency values and the number of pole-pairs of tested motor, empty load of motor rotating speed is obtained.
The sine wave that waveform is not standard is produced in motor operation course, harmonic content is more, if carrying out letter in time domain
Number process, the signal transacting step of needs is more, starts measurement motor No Load Start voltage, empty load of motor in present embodiment
Electric current, empty load of motor rotating speed are transformed into after frequency domain, on the basis of signal processing operations are simplified, can effectively remove harmonic content,
Increase measuring accuracy.
In preferred embodiment, detection means also includes generating Reports module；
Autoreport generation module, for the parameter for detecting to be generated into form.
Present embodiment can will detect parameter and generate form, shorten the testing time, improve operating efficiency.This embodiment party
Formula can generate form according to user's request, to select the parameter for needing.The form of present embodiment also include the testing time and
Tester.
In preferred embodiment, the frequency-region signal detection module of present embodiment includes current sampling resistor, A/D moduluss of conversion
Block, filtration module and frequency spectrum modular converter；
Current sampling resistor, for operating current during empty load of motor to be converted into into voltage signal；
A/D sampling modules, for the voltage signal to be converted into into data signal；
Filtration module, for being filtered to the data signal, obtains filtering signal；
Frequency spectrum modular converter, for the filtering signal to be carried out into Spectrum Conversion, obtains frequency-region signal.
Present embodiment gives the concrete composition of frequency-region signal detection module, and the resistance of current sampling resistor is chosen should
It is as far as possible little, select to be less than 0.5 Ω in present embodiment.
The data line of the A/D sampling modules of present embodiment is twisted-pair feeder, reduces external disturbance, is measuring stability
Provide safeguard.
The filtration module of present embodiment is realized using adaptive bandpass filter, according to the input voltage for treating measured motor,
To control upper lower limiting frequency.
The empty load of motor of present embodiment is started voltage detection module the peak value of frequency-region signal is entered using stabilization comparator
Row monitoring, excludes the false start phenomenon that motor is caused by pulse.
The detection method of the detection means of present embodiment includes following process：
Step one：Sampling resistor is connected in series in the current supply circuit for treating measured motor, current sampling resistor will treat measured motor
Unloaded operation electric current is converted to voltage signal；
Step 2：The voltage signal of step one is converted from analog into by data signal by A/D modular converters, then
Bandpass filtering and Spectrum Conversion are carried out, frequency-region signal is obtained；
Step 3：Fundamental wave is selected in frequency-region signal by empty load of motor rotation speed measuring module, and reads fundamental frequency value,
And rotating speed is calculated with reference to tested motor number of pole-pairs, the data for immediately arriving at are r/s, and it is real electrical machinery to be reconverted into r/min
Rotating speed；
Step 4：Start voltage detection module by empty load of motor carries out peak value monitoring to the waveform of frequency-region signal, works as peak
When value exceedes preset value, motor is identified as starting, and now reads supply voltage and is empty load of motor startup voltage, by motor
No Load Start current detection module reads source current and is empty load of motor starting current；
Step 5：Generate this step of form device and operate for user is alternative, testing time, people are can print out if necessary
The relevant informations such as member, test result data, if not printing, can continue monitor in real time or exit.
Claims (7)
1. the unloaded parameter detection device of a kind of direct current generator, it is characterised in that the detection means includes that frequency-region signal is obtained
Module, empty load of motor start voltage detection module, empty load of motor starting current detection module and empty load of motor rotation speed measuring module；
The frequency-region signal acquisition module, for operating current during empty load of motor to be measured to be converted into into frequency-region signal；
The empty load of motor starts voltage detection module, for being monitored to the peak value of frequency-region signal, presets when peak value exceedes
During value, the supply voltage of detection is empty load of motor and starts voltage；
The empty load of motor starting current detection module, for being monitored to the peak value of frequency-region signal, presets when peak value exceedes
During value, the source current of detection is empty load of motor starting current；
The empty load of motor rotation speed measuring module, for selecting the fundamental wave of frequency-region signal, and reads the frequency values of the fundamental wave, root
According to the frequency values and the number of pole-pairs of tested motor, empty load of motor rotating speed is obtained.
2. the unloaded parameter detection device of direct current generator according to claim 1, it is characterised in that the detection means is also
Including generation Reports module；
The autoreport generation module, for the parameter for detecting to be generated into form.
3. the unloaded parameter detection device of direct current generator according to claim 1 and 2, it is characterised in that the frequency domain letter
Number detection module includes current sampling resistor, A/D modular converters, filtration module and frequency spectrum modular converter；
The current sampling resistor, for operating current during empty load of motor to be converted into into voltage signal；
The A/D sampling modules, for the voltage signal to be converted into into data signal；
The filtration module, for being filtered to the data signal, obtains filtering signal；
The frequency spectrum modular converter, for the filtering signal to be carried out into Spectrum Conversion, obtains frequency-region signal.
4. the unloaded parameter detection device of direct current generator according to claim 3, it is characterised in that：The current sample electricity
The resistance of resistance is less than 0.5 Ω.
5. the unloaded parameter detection device of direct current generator according to claim 3, it is characterised in that the A/D samples mould
The data line of block is twisted-pair feeder.
6. the unloaded parameter detection device of direct current generator according to claim 3, it is characterised in that the filtration module is adopted
Realized with adaptive bandpass filter, upper lower limiting frequency is controlled according to the input voltage for treating measured motor.
7. the unloaded parameter detection device of direct current generator according to claim 3, it is characterised in that the empty load of motor is opened
Dynamic voltage detection module is monitored using stabilization comparator to the peak value of frequency-region signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611167752.2A CN106597281A (en) | 2016-12-16 | 2016-12-16 | No-load parameter detecting device for DC motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611167752.2A CN106597281A (en) | 2016-12-16 | 2016-12-16 | No-load parameter detecting device for DC motor |
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| CN106597281A true CN106597281A (en) | 2017-04-26 |
Family
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| CN201611167752.2A Pending CN106597281A (en) | 2016-12-16 | 2016-12-16 | No-load parameter detecting device for DC motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109490735A (en) * | 2018-10-12 | 2019-03-19 | 上海谱幂精密仪器科技有限公司 | It is a kind of for measuring the device and method of electric current and/or voltage |
| CN111198324A (en) * | 2020-01-08 | 2020-05-26 | 深圳远致富海智能产业有限公司 | Synchronous motor test method, device, test equipment and test system |
| CN111750156A (en) * | 2020-06-24 | 2020-10-09 | 合肥工业大学 | Method and system for controlling response time of micromotor driven valve and electronic equipment |
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| CN109490735A (en) * | 2018-10-12 | 2019-03-19 | 上海谱幂精密仪器科技有限公司 | It is a kind of for measuring the device and method of electric current and/or voltage |
| CN111198324A (en) * | 2020-01-08 | 2020-05-26 | 深圳远致富海智能产业有限公司 | Synchronous motor test method, device, test equipment and test system |
| CN111750156A (en) * | 2020-06-24 | 2020-10-09 | 合肥工业大学 | Method and system for controlling response time of micromotor driven valve and electronic equipment |
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