CN106646225B - A kind of portable electric engine efficiency on-site detecting device and method - Google Patents
A kind of portable electric engine efficiency on-site detecting device and method Download PDFInfo
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- CN106646225B CN106646225B CN201610883532.3A CN201610883532A CN106646225B CN 106646225 B CN106646225 B CN 106646225B CN 201610883532 A CN201610883532 A CN 201610883532A CN 106646225 B CN106646225 B CN 106646225B
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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
- G01R31/343—Testing dynamo-electric machines in operation
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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
- G01R31/346—Testing of armature or field windings
Abstract
The present invention relates to motor operating state prison detection field more particularly to a kind of portable electric engine efficiency on-site detecting devices, including signal acquisition module, processor module, display module；The output end of the input terminal electrical connection motor of the signal acquisition module, the data for motor operation acquire；The output end of the input terminal electrical connection signal acquisition module of the processor module, for calculating the real-time operational efficiency of motor；The output end of the input terminal electrical connection processor module of the display module, for realizing the display of electric efficiency and human-computer exchange function.The invention further relates to a kind of portable electric engine efficiency in-situ check and test methods.Present invention only requires acquisition motor voltage signal and current signal can on-line checking go out electric efficiency, breach other devices can only use torque sensor or speed probe test electric efficiency limitation, easy for installation, structure is simple.
Description
Technical field
The present invention relates to motor operating state detection fields, more particularly to a kind of portable electric engine efficiency on-site detecting device
And method.
Background technique
With the continuous aggravation of energy shortage problem and greenhouse effects, clean energy resource is developed and used, energy-saving and emission-reduction have become
Countries in the world focus of attention.Middle-size and small-size threephase asynchronous is that most widely used high energy consumption product electricity consumption accounts for about the whole nation
The 60% of total electricity consumption is even more to account for 3/4 or so, and motor running efficiency is generally relatively low in industrial circle, therefore, improves
The operational efficiency of motor is of great significance.Realize this target, first having to can be in the feelings for not interfering motor to operate normally
Accurate on-line checking goes out its actual operating efficiency under condition.
Yan Hua light etc. proposes the method intelligence test of energy-saving motor Efficiency testing platform (Yan Huaguang, Fan Ying, Duan little Hua, ancestor
Jian Hua, energy-saving motor Efficiency testing method and intelligence test platform [J] electricity needs management, 2007,03:41-43.),
The efficiency test of middle motor includes cold-state resistance test, temperature rise test, load test, no-load test etc..The efficiency test side
Test parameter needed for method is numerous, and operating procedure is complicated, and test macro builds difficulty.
A kind of motor efficiency test based on automatic control is disclosed in the patent that notification number is CN104215906A
Test method, this method by control motor voltage rating, rated current, rated frequency, realize test process
Automation control, but the realization of this mode needs to carry out heat test, load test, no-load test etc., and process is tedious, workload
Greatly, the period is long, and cannot be used for the on-line measurement of motor under Frequency Converter Control.
Summary of the invention
It is an object of the invention to propose a kind of portable electric engine efficiency to avoid above-mentioned deficiency of the prior art
On-site detecting device and method, detection motor operation efficiency that can be online in industry spot is easy for installation, easy to operate.
The technical scheme is that: a kind of portable electric engine efficiency on-site detecting device, it is characterised in that: adopted including signal
Collect module, processor module, display module；The output end of the input terminal electrical connection motor of the signal acquisition module, for electricity
The data acquisition of machine operation；The output end of the input terminal electrical connection signal acquisition module of the processor module, for calculating electricity
The real-time operational efficiency of machine；The output end of the input terminal electrical connection processor module of the display module, for realizing motor effect
The display of rate and human-computer exchange function.
Further, the signal acquisition module includes voltage sensor, current sensor and data collecting card, described
Voltage sensor, current sensor input terminal electrical connection motor input terminal, the output end of voltage sensor, current sensor
It is electrically connected the input terminal of data collecting card, the input terminal of the output end electrical connection processor module of the data collecting card.
Further, described device further includes man-machine handover exchange device, and the output end of the man-machine handover exchange device is electrically connected
Connect the input terminal of processor module.
Using the method for above-mentioned apparatus on-site test portable electric engine efficiency, the following steps are included:
S1. it is obtained by the voltage sensor, current sensor and speed probe installed before the connecting terminal of motor
Stator voltage u in motor operating stateA、uB、uCWith stator current iA、iB、ic；
S2. discrete Fourier transform is carried out using the voltage signal of motor, obtains the primitive period T of motor stator voltage；
S3. pass through the stator voltage u of motorA、uB、uCWith stator current iA、iB、icIt calculates and determines in motor signal period
The Mean Input Power P at sub- end1；
S4. by the stator voltage u of motorA、uB、uCWith stator current iA、iB、icAnd stator resistance Rs, obtain motor
Air gap torque Tair；
S5. to the stator voltage u of motorA、uB、uCWith stator current iA、iB、icClark is carried out by (3), (4) formula respectively
Transformation, then design a model according to Popov's hyperstability theory reference adaptive system, and the identification rule of revolving speed n can be obtained
Block diagram；
S6. no-load test under different frequency is carried out to motor, determines the wind moussing loss P of motorfwWith stray loss Ps；
S7. by the air gap torque T of the revolving speed n of motor and motorairObtain rotor copper loss of the motor in signal period
PCu；
S8. by the air gap torque T of motorair, rotor copper loss PCu, wind moussing loss PfwWith stray loss PsCalculate motor
Output power P2；
S9. by power input to a machine P1With output power P2Calculate the momentary efficiency η of motor.
Further, power input to machine P in the S31It is acquired by (1) formula:
Further, the air gap torque T of the S4 motorairIt is acquired by (2) formula:
Further, the method in the S5 specifically: to the stator voltage u of motorA、uB、uCWith stator current iA、iB、
icClark transformation is carried out by (3), (4) formula respectively, obtains uα、uβ、iα、iβ；And a step, wushu (5) are used as reference model,
Wushu (6) is used as adjustable model, and design a model reference adaptive system according to Popov's hyperstability theory, and revolving speed can be obtained
Identification rule block diagram:
qm=(iαuβ-iαuα)-σLs(iαpiβ-iβpiα) (5)
In this formulaqm--- the reference value of motor reactive power,--- motor is idle
The estimated value of power, Lm--- leakage inductance, Ls--- motor stator inductance, Lr--- rotor inductance, Tr--- rotor time is normal
Number,--- the estimated value of revolving speed,--- the estimated value of rotor α axis magnetic linkage,--- the estimated value of rotor β axis magnetic linkage,
Kp--- proportional control factor, Ki--- integral adjustment coefficient, p --- differential operator.
Further, rotor copper loss P of the motor in signal period in the S7CuIt calculates are as follows: motor is calculated by formula (8)
Revolutional slip s, and acquire by (9) formula the rotor copper loss P of motorCu；
PCu=sTair (9)
S in above formula --- motor slip ratio, ns--- motor synchronous rotational speed.
Further, in the S8 motor output power P2It is acquired by formula (10):
Further, the momentary efficiency η of motor is acquired by (11) formula in the S9:
The beneficial effects of the present invention are:
The present invention is based on traditional air gap torque Efficiency test methods, are then improved, it is only necessary to acquire motor
Voltage signal and current signal can on-line checking go out electric efficiency, breach other devices can only use torque sensor or
Speed probe tests the limitation of electric efficiency, and easy for installation, structure is simple, can be used for the motor under Frequency Converter Control
Efficiency testing has a good application prospect.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is overall structure diagram of the embodiment of the present invention；
Fig. 2 is schematic process flow diagram of the embodiment of the present invention；
Fig. 3 is the identification rule schematic block diagram of revolving speed of the embodiment of the present invention.
In figure: 1 regulated power supply；2 frequency converters；3 motors；4 shaft couplings；5 loads；6 voltage sensors；7 current sensors；8
Human-computer exchange equipment；9 data collecting cards；10 processor modules；11 displays.
Specific embodiment
Below in conjunction with attached drawing, technical scheme of the present invention will be further described, but the present invention is not limited to these realities
Apply example.
In conjunction with attached drawing 1, a kind of portable electric engine efficiency on-site detecting device in the present embodiment are as follows:
Voltage sensor 6 and current sense 7 are installed at the connecting terminal of motor；In the shaft end of the output shaft of the motor
Motor load 5 is installed；It is connected with load 5 by shaft joint 4 in motor 3；The motor 3 is mouse-cage type three-phase asynchronous electric
The power supply of machine, motor is regulated power supply 1, and the method for operation of motor is controlled by frequency converter 2, in motor operation efficiency monitoring system
Installation data capture card 9 in system, for transmitting the data that various kinds of sensors measures, man-machine handover exchange device to processor module 10
8 are used to input the necessary parameter of electric machine to processor module 10；Display 11 is used to the calculated result of video-stream processor module 10.
The Measurement bandwidth of the voltage sensor 7 will be the maximum pulse rate of ten times of frequency converters；The current sensor 6
It is connected in the input voltage line of motor；The human-computer exchange equipment 8 is connected with 10 pieces of processor die, be electric motor resistance, inductance,
The input equipment of the relevant parameters such as rated power；Acquisition while 6 road signal may be implemented in the data collecting card 9, adopts
Belt transect is wide in 250KHz or more, is connected by USB port with processor 10, is mainly used to collection voltages signal and current signal,
Then the collected signal of institute is transferred to processor module；Processor module mainly by FPGA be core microprocessor come reality
It is existing, for calculating the operational efficiency of real-time motor.
In conjunction with attached drawing 2, a kind of portable electric engine efficiency in-situ check and test method, comprising the following steps:
S1. it is obtained by the voltage sensor, current sensor and speed probe installed before the connecting terminal of motor
Stator voltage u in motor operating stateA、uB、uCWith stator current iA、iB、ic；
S2. discrete Fourier transform is carried out using the voltage signal of motor, obtains the primitive period T of motor stator voltage；
S3. pass through the stator voltage u of motorA、uB、uCWith stator current iA、iB、icIt calculates and determines in motor signal period
The Mean Input Power P at sub- end1, Mean Input Power P1The measurement for being measured as frequency conversion input power；
S4. by the stator voltage u of motorA、uB、uCWith stator current iA、iB、icAnd stator resistance Rs, obtain motor
Air gap torque Tair；
S5. to the stator voltage u of motorA、uB、uCWith stator current iA、iB、icClark is carried out by (3), (4) formula respectively
Transformation, then design a model according to Popov's hyperstability theory reference adaptive system, and the identification rule of revolving speed n can be obtained
Block diagram；
S6. no-load test under different frequency is carried out to motor, determines the wind moussing loss P of motorfwWith stray loss Ps；
S7. by the air gap torque T of the revolving speed n of motor and motorairObtain rotor copper loss of the motor in signal period
PCu；
S8. by the air gap torque T of motorair, rotor copper loss PCu, wind moussing loss PfwWith stray loss PsCalculate motor
Output power P2；
S9. by power input to a machine P1With output power P2Calculate the momentary efficiency η of motor.
Further, power input to machine P in the S31It is acquired by (1) formula:
The air gap torque T of the S4 motorairIt is acquired by (2) formula:
Method in conjunction with attached drawing 3, in the S5 specifically: to the stator voltage u of motorA、uB、uCWith stator current iA、iB、
icClark transformation is carried out by (3), (4) formula respectively, obtains uα、uβ、iα、iβ；Further, wushu (5) is used as reference model,
Using (6) as adjustable model, design a model reference adaptive system according to Popov's hyperstability theory, and revolving speed can be obtained
Regular block diagram is recognized, the revolving speed n of motor is identified using the model reference adaptive system (MRAS) of motor:
qm=(iαuβ-iαuα)-σLs(iαpiβ-iβpiα) (5)
In this formulaqm--- the reference value of motor reactive power,--- motor is idle function
The estimated value of rate, Lm--- leakage inductance, Ls--- motor stator inductance, Lr--- rotor inductance, Tr--- rotor time is normal
Number,--- the estimated value of revolving speed,--- the estimated value of rotor α axis magnetic linkage,--- the estimated value of rotor β axis magnetic linkage,
Kp--- proportional control factor, Ki--- integral adjustment coefficient, p --- differential operator.
Using the regulation in three phase induction motor experimental method (GB/T 22670-2008) in the S6, motor is determined
Wind moussing loss PfwWith stray loss Ps。
Rotor copper loss P of the motor in signal period in the S7CuIt calculates are as follows: the revolutional slip of motor is calculated by formula (8)
S, and acquire by (9) formula the rotor copper loss P of motorCu；
PCu=sTair (9)
S in above formula --- motor slip ratio, ns--- motor synchronous rotational speed.
Further, in the S8 motor output power P2It is acquired by formula (10):
Further, the momentary efficiency η of motor is acquired by (11) formula in the S9:
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (7)
1. a kind of portable electric engine efficiency on-site detecting device, it is characterised in that: including signal acquisition module, processor module,
Display module；The output end of the input terminal electrical connection motor of the signal acquisition module, the data for motor operation acquire；Institute
The output end for stating the input terminal electrical connection signal acquisition module of processor module, for calculating the real-time operational efficiency of motor；Institute
The output end of the input terminal electrical connection processor module of display module is stated, for realizing the aobvious of electric efficiency and human-computer exchange function
Show；The signal acquisition module includes voltage sensor, current sensor and data collecting card, the voltage sensor, electricity
Flow sensor input terminal electrical connection motor input terminal, voltage sensor, current sensor output end electrical connection data adopt
The input terminal of truck, the input terminal of the output end electrical connection processor module of the data collecting card；Described device further includes people
Machine joins exchange device, the input terminal of the output end electrical connection processor module of the man-machine handover exchange device；
Using the method for above-mentioned apparatus on-site test portable electric engine efficiency, the following steps are included:
S1. motor is obtained by the voltage sensor, current sensor and speed probe installed before the connecting terminal of motor
Stator voltage u in operating statusA、uB、uCWith stator current iA、iB、ic；
S2. discrete Fourier transform is carried out using the voltage signal of motor, obtains the primitive period T of motor stator voltage；
S3. pass through the stator voltage u of motorA、uB、uCWith stator current iA、iB、icCalculate the stator terminal in motor signal period
Mean Input Power P1；
S4. by the stator voltage u of motorA、uB、uCWith stator current iA、iB、icAnd stator resistance Rs, obtain the air gap turn of motor
Square Tair；
S5. to the stator voltage u of motorA、uB、uCWith stator current iA、iB、icClark change is carried out by (3), (4) formula respectively
It changes, then design a model according to Popov's hyperstability theory reference adaptive system, and the identification rule frame of revolving speed n can be obtained
Figure；
S6. no-load test under different frequency is carried out to motor, determines the wind moussing loss P of motorfwWith stray loss Ps；
S7. by the air gap torque T of the revolving speed n of motor and motorairObtain the P of rotor copper loss of the motor in signal periodCu；
S8. by the air gap torque T of motorair, rotor copper loss PCu, wind moussing loss PfwWith stray loss PsCalculate the defeated of motor
Power P out2；
S9. by power input to a machine P1With output power P2Calculate the momentary efficiency η of motor.
2. a kind of portable electric engine efficiency on-site detecting device according to claim 1, which is characterized in that electric in the S3
Machine input power P1It is acquired by (1) formula:
3. a kind of portable electric engine efficiency on-site detecting device according to claim 1, which is characterized in that the S4 motor
Air gap torque TairIt is acquired by (2) formula:
P is differential operator in above formula.
4. a kind of portable electric engine efficiency on-site detecting device according to claim 1, which is characterized in that in the S5
Method specifically: to the stator voltage u of motorA、uB、uCWith stator current iA、iB、icClark is carried out by (3), (4) formula respectively
Transformation, obtains uα、uβ、iα、iβ；Further, wushu (5) is used as reference model, and wushu (6) is used as adjustable model, according to wave wave
The identification rule block diagram of revolving speed can be obtained come the reference adaptive system that designs a model in husband's hyperstability theory:
qm=(iαuβ-iαuα)-σLs(iαpiβ-iβpiα) (5)
In this formulaqm--- the reference value of motor reactive power,--- motor reactive power
Estimated value, Lm--- leakage inductance, Ls--- motor stator inductance, Lr--- rotor inductance, Tr--- rotor time constant,
--- the estimated value of revolving speed,--- the estimated value of rotor α axis magnetic linkage,--- the estimated value of rotor β axis magnetic linkage, Kp——
Proportional control factor, Ki--- integral adjustment coefficient, p --- differential operator.
5. a kind of portable electric engine efficiency on-site detecting device according to claim 1, which is characterized in that electric in the S7
Rotor copper loss P of the machine in signal periodCuIt calculates are as follows: calculate the revolutional slip s of motor by formula (8), and motor is acquired by (9) formula
Rotor copper loss PCu；
PCu=sTair (9)
S in above formula --- motor slip ratio, ns--- motor synchronous rotational speed,--- the estimated value of revolving speed.
6. a kind of portable electric engine efficiency on-site detecting device according to claim 1, which is characterized in that electric in the S8
The output power P of machine2It is acquired by formula (10):
In above formula--- the estimated value of revolving speed.
7. a kind of portable electric engine efficiency on-site detecting device according to claim 1, which is characterized in that electric in the S9
The momentary efficiency η of machine is acquired by (11) formula:
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| CN107192949A (en) * | 2017-06-26 | 2017-09-22 | 大连理工大学 | Based on the motor efficiency detecting instrument of electrical quantity can be surveyed |
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| CN108196118A (en) * | 2018-02-14 | 2018-06-22 | 武汉大学 | A kind of disconnecting switch output power of motor detection device |
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| CN110007166B (en) * | 2019-03-26 | 2021-06-29 | 安徽大学 | Method for rapidly measuring energy efficiency of frequency converter |
| CN110487327B (en) * | 2019-08-13 | 2021-08-17 | 中铁十二局集团有限公司 | Running state detection system of mechanical equipment electrical system |
| CN111564999B (en) * | 2019-12-30 | 2021-12-14 | 哈尔滨工业大学（深圳） | Motor low-speed measurement method based on MRAS algorithm |
| CN114371339A (en) * | 2021-12-03 | 2022-04-19 | 云南电网有限责任公司红河供电局 | Method for measuring output power of high-voltage isolating switch driving motor |
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