CN106646225A - Portable motor efficiency on-site detection device and method - Google Patents

Abstract

The present invention relates to the monitoring and detecting field of the running state of a motor and particularly relates to a portable motor efficiency on-site detection device. The device comprises a signal acquisition module, a processor module and a display module. The input end of the signal acquisition module is electrically connected with output end of the motor, and is used for acquiring the operation data of the motor. The input end of the processor module is electrically connected with the output end of the signal acquisition module and is used for calculating the operation efficiency of the motor in real time. The input end and the display module is electrically connected with the output end of the processor module and is used for realizing the display of the motor efficiency and the display of the man-machine interaction function. The invention also relates to a portable motor efficiency on-site detection method. According to the technical scheme of the invention, through acquiring the voltage signals and the current signals of the motor, the motor efficiency can be detected in the online manner. The limitation in testing the motor efficiency by utilizing a torque sensor, a rotating speed sensor or other devices can be broken through. Meanwhile, the device is convenient in installation and simple in structure.

Description

A kind of portable electric engine efficiency on-site detecting device and method

Technical field

The present invention relates to motor operating state detection field, more particularly to a kind of portable electric engine efficiency on-site detecting device And method.

Background technology

With the continuous aggravation of energy shortage problem and greenhouse effect, develop clean energy resource, energy-saving and emission-reduction becomes Countries in the world focus of attention.Middle-size and small-size threephase asynchronous is that most widely used high energy consumption product power consumption accounts for the whole nation The 60% of total electricity consumption, is even more in industrial circle and accounts for 3/4 or so, and motor running efficiency is generally low, therefore, improve The operational efficiency of motor is significant.This target is realized, first having to can be in the feelings for not disturbing motor normally to run Accurate on-line checking goes out its actual operating efficiency under condition.

Yan Hua light etc. proposes energy-saving motor Efficiency testing method intelligent test platform (Yan Huaguang, Fan Ying, Duan little Hua, ancestor Jian Hua, energy-saving motor Efficiency testing method and intelligent test platform [J]. electricity needs is managed, and 2007,03:41-43.), its 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 is numerous needed for method, and operating procedure is complicated, and test system builds difficulty.

Disclose a kind of based on the motor efficiency for automatically controlling test in notification number is for the patent of CN104215906A Test method, the method by control motor rated voltage, rated current, rated frequency, realize process of the test Automated condtrol, but the realization of this mode needs to carry out heat test, load test, no-load test etc., tedious process, workload Greatly, the cycle is long, and cannot be used for the on-line measurement of motor under Frequency Converter Control.

The content of the invention

It is an object of the invention to avoid the deficiency existing for above-mentioned prior art, propose a kind of portable electric engine efficiency On-site detecting device and method, it can be easy for installation in the online detection motor operation efficiency of industry spot, simple to operate.

The technical scheme is that：A kind of portable electric engine efficiency on-site detecting device, including signal acquisition module, process Device module, display module；The input of the signal acquisition module electrically connects the outfan of motor, for the data of motor operation Collection；The input of the processor module electrically connects the outfan of signal acquisition module, runs in real time for calculating motor Efficiency；The input of the display module electrically connects the outfan of processor module, for realizing electric efficiency and human-computer exchange The display of function.

Further, the signal acquisition module includes voltage sensor, current sensor and data collecting card, described Voltage sensor, the input of current sensor electrically connect the input of motor, voltage sensor, the outfan of current sensor The input of electrical connection data collecting card, the outfan of the data collecting card electrically connects the input of processor module.

Further, described device also includes human-computer exchange equipment, at the outfan electrical connection of the human-computer exchange equipment The input of reason device module.

A kind of portable electric engine efficiency in-situ check and test method, comprises the following steps：

S1. voltage sensor, current sensor and the speed probe by installing before the binding post of motor is obtained Stator voltage u in motor operating state_A、u_B、u_CWith stator current i_A、i_B、i_c；

S2. discrete Fourier transform is carried out using the voltage signal of motor, draws the primitive period T of motor stator voltage；

S3. by stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cCalculate determining in motor signal period The Mean Input Power P at sub- end₁；

S4. by stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cAnd stator resistance R_s, obtain motor Air gap torque T_air；

S5. to stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cRespectively Clark is carried out by (3), (4) formula Conversion, is then obtained the identification rule of rotating speed n according to Popov's hyperstability theory come the reference adaptive system that designs a model Block diagram；

S6. no-load test under different frequency is carried out to motor, determines the wind moussing loss P of motor_fwWith stray loss P_s；

S7. the P of rotor copper loss of the motor in signal period is drawn by the rotating speed n of motor_Cu；

S8. by the air gap torque T of motor_air, rotor copper loss P_Cu, wind moussing loss P_fwWith stray loss P_sCalculate motor Output P₂；

S9. by power input to a machine P₁With output P₂Calculate momentary efficiency η of motor.

Further, power input to machine P in the S3₁Tried to achieve by (1) formula：

Further, the air gap torque T of the S4 motors_airTried to achieve by (2) formula：

Further, the method in the S5 is specially：Stator voltage u to motor_A、u_B、u_CWith stator current i_A、i_B、 i_cRespectively Clark conversion is carried out by (3), (4) formula, obtain u_α、u_β、i_α、i_β；And further, we refer to mould at wushu (5) conduct Type, using (6) as adjustable model, design a model reference adaptive system according to Popov's hyperstability theory, can be turned The identification rule block diagram of speed：

q_m=(i_αu_β-i_αu_α)-σL_s(i_αpi_β-i_βpi_α) (5)

In this formulaq_m--- the reference value of motor reactive power,--- motor is idle work( The estimated value of rate, L_m--- leakage inductance, L_s--- motor stator inductance, L_r--- rotor inductance, T_r--- rotor time is normal Number,--- the estimated value of rotating speed,--- the estimated value of rotor α axle magnetic linkages,--- the estimated value of rotor β axle magnetic linkages, K_p--- proportional control factor, K_i--- integral adjustment coefficient, p --- differential operator.

Further, rotor copper loss P of the motor in signal period in the S7_CuIt is calculated as：Motor is calculated by formula (8) Revolutional slip s, and the rotor copper loss P of motor is tried to achieve by (9) formula_Cu；

P_Cu=sT_air (9)

S in above formula --- motor slip ratio, n_s--- motor in synchrony rotating speed.

Further, in the S8 motor output P₂Tried to achieve by formula (10)：

Further, momentary efficiency η of motor is tried to achieve by (11) formula in the S9:

The invention has the beneficial effects as follows：

The present invention is based on traditional air gap torque Efficiency test method, is then improved, it is only necessary to gather motor Voltage signal and current signal just can go out electric efficiency with on-line checking, breach other devices can only use torque sensor or The limitation of speed probe testing of electric motors efficiency, its is easy for installation, simple structure, the motor that can be used under Frequency Converter Control Efficiency testing, has a good application prospect.

Description of the drawings

With reference to the accompanying drawings and detailed description the present invention is further detailed explanation.

Fig. 1 is embodiment of the present invention overall structure diagram；

Fig. 2 is embodiment of the present invention schematic process flow diagram；

Fig. 3 is the identification rule schematic block diagram of embodiment of the present invention rotating speed.

In figure：1 regulated power supply；2 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 display.

Specific embodiment

Below in conjunction with accompanying drawing, technical scheme is further described, but the present invention is not limited to these realities Apply example.

With reference to accompanying drawing 1, a kind of portable electric engine efficiency on-site detecting device is in the present embodiment：

Voltage sensor 6 and current sense 7 are installed at the binding post of motor；In the shaft end of the output shaft of the motor Motor load 5 is installed；It is connected by shaft joint 4 with load 5 in motor 3；The motor 3 is mouse-cage type three-phase asynchronous electric Machine, the power supply of motor is regulated power supply 1, and the method for operation of motor is controlled by converter 2, in motor operation efficiency monitoring system Installation data capture card 9 in system, for transmitting the data that various kinds of sensors is measured, human-computer exchange equipment 8 to processor module 10 For being input into the necessary parameter of electric machine to processor module 10；Display 11 is used for the result of calculation of video-stream processor module 10.

The Measurement bandwidth of the voltage sensor 7 will be the maximum pulse rate of ten times of converters；The current sensor 6 In being connected on the input voltage line of motor；The human-computer exchange equipment 8 is connected for 10 pieces with processor die, be electric motor resistance, inductance, The input equipment of the relevant parameters such as rated power；Described data collecting card 9 can be realized being gathered while 6 road signal, and it is adopted Belt transect width is connected by USB port in more than 250KHz with processor 10, is mainly used to collection voltages signal and current signal, Then the signal transmission for being collected to processor module；Processor module mainly comes real by FPGA for the microprocessor of core It is existing, for calculating the operational efficiency of real-time motor.

With reference to accompanying drawing 2, the present embodiment further relates to a kind of detection method of portable electric engine efficiency on-site detecting device, specifically Comprise the following steps：

S1. voltage sensor, current sensor and the speed probe by installing before the binding post of motor is obtained Stator voltage u in motor operating state_A、u_B、u_CWith stator current i_A、i_B、i_c；

S2. discrete Fourier transform is carried out using the voltage signal of motor, draws the primitive period T of motor stator voltage；

S3. by stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cCalculate determining 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 stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cAnd stator resistance R_s, obtain motor Air gap torque T_air；

S5. to stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cRespectively Clark is carried out by (3), (4) formula Conversion, is then obtained the identification rule of rotating speed n according to Popov's hyperstability theory come the reference adaptive system that designs a model Block diagram；

S6. no-load test under different frequency is carried out to motor, determines the wind moussing loss P of motor_fwWith stray loss P_s；

S7. by the rotating speed n and the P for drawing rotor copper loss of the motor in signal period of motor_Cu；

S8. by the air gap torque T of motor_air, rotor copper loss P_Cu, wind moussing loss P_fwWith stray loss P_sCalculate motor Output P₂；

S9. by power input to a machine P₁With output P₂Calculate momentary efficiency η of motor.

Power input to machine P in the S3₁Tried to achieve by (1) formula：

The air gap torque T of the S4 motors_airTried to achieve by (2) formula：

With reference to accompanying drawing 3, the method in the S5 is specially：Stator voltage u to motor_A、u_B、u_CWith stator current i_A、i_B、 i_cRespectively Clark conversion is carried out by (3), (4) formula, obtain u_α、u_β、i_α、i_β；And further, we refer to mould at wushu (5) conduct Type, using (6) as adjustable model, design a model reference adaptive system according to Popov's hyperstability theory, can be turned The identification rule block diagram of speed, using the model reference adaptive system (MRAS) of motor the rotating speed n of motor is identified：

q_m=(i_αu_β-i_αu_α)-σL_s(i_αpi_β-i_βpi_α) (5)

In this formulaq_m--- the reference value of motor reactive power,--- motor is idle work( The estimated value of rate, L_m--- leakage inductance, L_s--- motor stator inductance, L_r--- rotor inductance, T_r--- rotor time is normal Number,--- the estimated value of rotating speed,--- the estimated value of rotor α axle magnetic linkages,--- the estimated value of rotor β axle magnetic linkages, K_p--- proportional control factor, K_i--- integral adjustment coefficient, p --- differential operator.

Using the regulation in three phase induction motor experimental technique (GB/T 22670-2008) in the S6, motor is determined Wind moussing loss P_fwWith stray loss P_s。

Rotor copper loss P of the motor in signal period in the S7_CuIt is calculated as：The revolutional slip of motor is calculated by formula (8) S, and the rotor copper loss P of motor is tried to achieve by (9) formula_Cu；

P_Cu=sT_air (9)

S in above formula --- motor slip ratio, n_s--- motor in synchrony rotating speed.

The output P of motor in the S8₂Tried to achieve by formula (10)：

Finally, momentary efficiency η of motor is tried to achieve by (11) formula in the S9:

Specific embodiment described herein is only explanation for example spiritual to the present invention.Technology neck belonging to of the invention The technical staff in domain can be made various modifications to described specific embodiment or supplement or replaced using similar mode Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.

Claims (10)

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 input of the signal acquisition module electrically connects the outfan of motor, for the data acquisition of motor operation；The place The input of reason device module electrically connects the outfan of signal acquisition module, for calculating the real-time operational efficiency of motor；

The input of the display module electrically connects the outfan of processor module, for realizing electric efficiency and human-computer exchange work( The display of energy.

2. under complex working condition according to claim 1 motor operation efficiency supervising device, it is characterised in that：The signal Acquisition module include voltage sensor, current sensor and data collecting card, the voltage sensor, current sensor it is defeated Enter the input of end electrical connection motor, voltage sensor, the outfan of current sensor electrically connect the input of data collecting card, The outfan of the data collecting card electrically connects the input of processor module.

3. under complex working condition according to claim 1 motor operation efficiency supervising device, it is characterised in that：Described device Also include human-computer exchange equipment, the outfan of the human-computer exchange equipment electrically connects the input of processor module.

4. the detection method of a kind of portable electric engine efficiency on-site detecting device according to claim 1 or 2 or 3, it is special Levy and be, comprise the following steps：

S1. obtained in motor operating state by the voltage sensor of installation, current sensor before the binding post of motor Stator voltage u_A、u_B、u_CWith stator current i_A、i_B、i_c；

S2. discrete Fourier transform is carried out using the voltage signal of motor, draws the primitive period T of motor stator voltage；

S3. by stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cCalculate the stator terminal in motor signal period Mean Input Power P₁；

S4. by stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cAnd stator resistance R_s, obtain the air gap turn of motor Square T_air；

S5. to stator voltage u of motor_A、u_B、u_CWith stator current i_A、i_B、i_cRespectively Clark changes are carried out by (3), (4) formula Change, then the identification rule frame of rotating speed n is obtained come the reference adaptive system that designs a model according to Popov's hyperstability theory Figure；

S6. no-load test under different frequency is carried out to motor, determines the wind moussing loss P of motor_fwWith stray loss P_s；

S7. by the rotating speed n and the P for drawing rotor copper loss of the motor in signal period of motor_Cu；

S8. by the air gap torque T of motor_air, rotor copper loss P_Cu, wind moussing loss P_fwWith stray loss P_sCalculate the defeated of motor Go out power P₂；

S9. by power input to a machine P₁With output P₂Calculate momentary efficiency η of motor.

5. under complex working condition according to claim 4 the supervising device of motor operation efficiency monitoring method, its feature exists In power input to machine P in the S3₁Tried to achieve by (1) formula：

$P_1=\frac{1}{T}\underset{0}{\overset{T}{\∫}}\left(u_A\right(t)*i_A\left(t\right)+u_B\left(t\right)*i_B\left(t\right)+u_C\left(t\right)*i_C\left(t\right))dt---\left(1\right).$

6. detection method according to claim 4, it is characterised in that the air gap torque T of the S4 motors_airBy (2) formula Try to achieve：

$\begin{array}{c}{T}_{air}=\frac{p}{2\sqrt{3}}\{\left(i_A-i_B\right)\∫\[\left(u_A-u_C\right)-R_s\left(i_C-i_A\right)\]dt\\ -\left(i_C-i_A\right)\∫\[\left(u_B-u_A\right)-R_s\left(i_C-i_A\right)\]dt\}\end{array}---\left(2\right).$

7. detection method according to claim 4, it is characterised in that the method in the S5 is specially：Motor is determined Sub- voltage u_A、u_B、u_CWith stator current i_A、i_B、i_cRespectively Clark conversion is carried out by (3), (4) formula, obtain u_α、u_β、i_α、i_β； , used as reference model, using (6) as adjustable model, design a model ginseng according to Popov's hyperstability theory for our wushu (5) Adaptable System is examined, the identification rule block diagram of rotating speed is obtained：

$\left(\begin{array}{c}{u}_A\\ u_B\\ u_C\end{array}\right)=\left(\begin{array}{cc}1& 0\\ -1/2& \sqrt{3}/2\\ -1/2& -\sqrt{3}/2\end{array}\right)\left(\begin{array}{c}{u}_{\mathrm{\α}}\\ u_{\mathrm{\β}}\end{array}\right)---\left(3\right)$

$\left(\begin{array}{c}{i}_A\\ i_B\\ i_C\end{array}\right)=\left(\begin{array}{cc}1& 0\\ -1/2& \sqrt{3}/2\\ -1/2& -\sqrt{3}/2\end{array}\right)\left(\begin{array}{c}{i}_{\mathrm{\α}}\\ i_{\mathrm{\β}}\end{array}\right)---\left(4\right)$

q_m=(i_αu_β-i_αu_α)-σL_s(i_αpi_β-i_βpi_α) (5)

${\hat{q}}_m=\frac{L_m}{L_r}\[({\widehat{\mathrm{\ψ}}}_{r\mathrm{\α}}{i}_{\mathrm{\α}}+{\widehat{\mathrm{\ψ}}}_{r\mathrm{\β}}{i}_{\mathrm{\β}}){\hat{w}}_r+\frac{1}{T_r}({\widehat{\mathrm{\ψ}}}_{r\mathrm{\α}}{i}_{\mathrm{\β}}+{\widehat{\mathrm{\ψ}}}_{r\mathrm{\β}}{i}_{\mathrm{\α}})\]---\left(6\right)$

${\hat{w}}_r=(K_p+\frac{K_i}{p})(q_m-{\hat{q}}_m)---\left(7\right)$

In this formulaq_m--- the reference value of motor reactive power,--- motor reactive power Estimated value, L_m--- leakage inductance, L_s--- motor stator inductance, L_r--- rotor inductance, T_r--- rotor time constant, --- the estimated value of rotating speed,--- the estimated value of rotor α axle magnetic linkages,--- estimated value, the K of rotor β axle magnetic linkages_p—— Proportional control factor, K_i--- integral adjustment coefficient, p --- differential operator.

8. detection method according to claim 4, it is characterised in that rotor copper of the motor in signal period in the S7 Consumption P_CuIt is calculated as：The revolutional slip s of motor is calculated by formula (8), and the rotor copper loss P of motor is tried to achieve by (9) formula_Cu；

$s=\frac{n_s-{\hat{w}}_r}{n_s}---\left(8\right)$

P_Cu=sT_air (9)

S in above formula --- motor slip ratio, n_s--- motor in synchrony rotating speed.

9. detection method according to claim 4, it is characterised in that the output P of motor in the S8₂By formula (10) Try to achieve：

$P_2=T_{air}\mathrm{\π}\·\frac{{\hat{w}}_r}{30}-P_{Cu2}-P_{fw}-P_s---\left(10\right).$

10. detection method according to claim 4, it is characterised in that momentary efficiency η of motor passes through (11) in the S9 Formula is tried to achieve:

$\mathrm{\η}=\frac{P_2}{P_1}\×100\%---\left(11\right).$