CN203732614U - Terminal voltage measuring device of AC variable frequency motor - Google Patents
Terminal voltage measuring device of AC variable frequency motor Download PDFInfo
- Publication number
- CN203732614U CN203732614U CN201320865048.XU CN201320865048U CN203732614U CN 203732614 U CN203732614 U CN 203732614U CN 201320865048 U CN201320865048 U CN 201320865048U CN 203732614 U CN203732614 U CN 203732614U
- Authority
- CN
- China
- Prior art keywords
- model
- integrator
- integrators
- sensor
- variable frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a terminal voltage measuring device of an AC variable frequency motor, which aims to overcome the problems of: 1. larger terminal voltage error of an AC variable frequency motor (3), which is obtained through converting DC bus voltage; and (2) incapability of realizing by common controllers because an ultrahigh digital sampling frequency and high-speed digital signal processing are required in directly measuring the terminal voltage of the AC variable frequency motor (3). The measuring device is composed of a sensor, a sampling resistor, a No.1 integrator and a No.2 integrator. The output end of the sensor is connected with one end of the sampling resistor through a wire. The other end of the sampling resistor is simultaneously connected with one end of the No.1 integrator and one end of the No.2 integrator through wires. The sampling resistor, the No.1 integrator and the No.2 integrator are welded on a same circuit board. The input end of the sensor is connected with the PWM voltage side of the inverter (2), namely the end voltage side of the AC variable frequency motor (3). The other end of the No.1 integrator and the other end of the No.2 integrator are simultaneously connected with the I/O port in a motor controller (4) through wires.
Description
Technical field
The utility model relates to a kind of measuring mechanism, and or rather, the utility model relates to a kind of set end voltage measurement mechanism of alternating-current variable frequency motor.
Background technology
Along with the develop rapidly of Power Electronic Technique, alternating-current variable frequency motor is widely applied in industry member.In alternating-current variable frequency motor system, control algolithm is the core of decision systems performance, and the accuracy of sensor collection signal will directly have influence on the effect of control algolithm.Due to the terminal voltage of the alternating-current variable frequency motor PWM form that is high-frequency and high-voltage, cannot realize at present sensor measures in real time, so industry member is generally used voltage sensor to measure inverter input terminal voltage (as Vdc in Fig. 1) replacement motor terminal voltage (as Vac in Fig. 1) at present.Due to the accurately loss of voltage of taking into account inverter of this measuring method, so the voltage error of measuring is larger, how accurately obtains motor terminal voltage and be subject in recent years extensive concern both domestic and external.
The measuring accuracy of alternating-current variable frequency power set end voltage not only affects Electric Machine Control performance, and development important in inhibiting to electric machine without position sensor technology.So-called electric machine without position sensor technology is exactly to utilize the voltage of motor, current information to estimate a kind of method of motor rotor position information.In the not high application scenario of reliability requirement, utilize the position-sensor-free technology can be cost-saving, the work of save purchase, rotor-position sensor being installed; In the higher occasion of reliability requirement, position-sensor-free technology can be used as the backup of position transducer, the in the situation that of the sensor failure of position, system is normally worked.Obviously, the precision that motor terminal voltage is measured will have influence on the precision that rotor-position is estimated, in fact, cannot obtain terminal voltage accurately affects the key factor that position-sensor-free technology at present cannot spread just.
By literature search and investigation, terminal voltage measuring accuracy is also just to be paid attention to by foreign scholar in nearly 5 years on the impact of position-sensor-free technical feature, at present both at home and abroad all without the method for direct Measurement accuracy alternating-current variable frequency motor machine end PWM voltage.
Summary of the invention
Technical problem to be solved in the utility model is to have overcome prior art existence: if 1. gather DC bus-bar voltage, and the accurately pressure drop of taking into account inverter of terminal voltage that converts and obtain, error is larger; If 2. directly measure motor terminal voltage, due to the characteristic of PWM square wave, need high digital sample frequency and digital signal processing at a high speed, the problem that Common Controller cannot be realized, provides a kind of set end voltage measurement mechanism of alternating-current variable frequency motor.
For solving the problems of the technologies described above, the utility model is to adopt following technical scheme to realize: the set end voltage measurement mechanism of described alternating-current variable frequency motor comprises sensor, sampling resistor, No. 1 integrator and No. 2 integrators;
The output terminal of sensor is connected with one end electric wire of sampling resistor, and the other end of sampling resistor is connected with one end electric wire of No. 2 integrators with No. 1 integrator simultaneously.
Sensor described in technical scheme is selected the sensor of HV-C04 series, and it is 0201 Chip-R that sampling resistor is selected model, and it is No. 1 integrator of DIN and No. 2 integrators that model is DIN that No. 1 integrator and No. 2 integrators are selected model.One end electric wire of the Chip-R that the output terminal Vc of the sensor of HV-C04 series is 0201 with model is connected, model is that the Uin of the Uin end of the other end of 0201 Chip-R 0201 No. 1 integrator that is DIN with model No. 2 integrators that are DIN with model holds electric wire to be connected, and No. 2 integrators that Chip-R, the model that model is 0201 is DIN No. 1 integrator and model are DIN are welded on same circuit board.
Sensor described in technical scheme is selected the sensor of LV25-P series, and it is 0402 Chip-R that sampling resistor is selected model, and it is No. 1 integrator of OEM and No. 2 integrators that model is OEM that No. 1 integrator and No. 2 integrators are selected model;
One end cable of the Chip-R that the output terminal OUT of the sensor of LV25-P series is 0402 with model is connected, model is that the Uin of the Uin end of the other end of 0402 Chip-R No. 1 integrator that is OEM with model No. 2 integrators that are OEM with model holds electric wire to be connected, and No. 2 integrators that Chip-R, the model that model is 0402 is OEM No. 1 integrator and model are OEM are welded on same circuit board.
The terminal voltage side electric wire that the input end of the set end voltage measurement mechanism of the alternating-current variable frequency motor described in technical scheme is alternating-current variable frequency motor by sensor and the PWM voltage side of inverter is connected;
No. 1 described integrator is connected with the I/O mouth electric wire in electric machine controller with the other end of No. 2 integrators simultaneously; Be that model is that the I/O mouth of control panel in the Uout end of No. 1 integrator of OEM No. 2 integrators that are OEM with model and electric machine controller adopts the Uout of No. 2 integrators that electric wire is connected or model is DIN No. 1 integrator is DIN with model to hold and the I/O mouth employing electric wire of control panel in electric machine controller is connected.
Compared with prior art the beneficial effects of the utility model are:
1. consult Fig. 1, due to the terminal voltage of the alternating-current variable frequency motor PWM form that is high-frequency and high-voltage, cannot realize at present sensor and measure in real time, so industry member is generally used voltage sensor to measure inverter input direct-current bus terminal voltage Vdc replacement motor terminal voltage Vac at present.If measure the DC bus-bar voltage of inverter input terminal, the terminal voltage that conversion obtains is the pressure drop of taking into account inverter accurately, error is larger, consult Fig. 3, the utility model has improved existing scheme, has increased the high precision electro pressure measuring device that utilizes Design of Amplifiers mimic channel at the output terminal of inverter, can accurately measure like this inverter output end voltage (being motor terminal voltage), avoid the measuring voltage error causing due to inverter pressure drop, thereby improve the control performance of motor.
2. the terminal voltage of motor is except having conclusive impact the control performance of motor, some application technologies to motor also have a significant impact, for example in position-sensor-free, utilize motor terminal voltage to determine rotor-position, and the precision that the Accuracy that motor terminal voltage is measured is estimated to rotor-position, this is the key factor that position-sensor-free technology at present cannot spread, the method of the measurement motor terminal voltage the utility model proposes has obtained terminal voltage accurately, is conducive to the popularization of position-sensor-free technology.
3. the PWM form that is high-frequency and high-voltage due to the terminal voltage of alternating-current variable frequency motor, general frequency is about 5-20KHz, the ratio of shared time of high level pulsewidth in the square-wave signal one-period of high frequency for this reason of the characteristic that determines this signal amplitude.
As: electric moter voltage PWM frequency is 10kHz, and the PWM cycle is 100us, if voltage sample frequency is up to 1MHz, its measuring accuracy time precision is 1us, visible its measuring error is up to 1%, and high like this sample frequency will take the resource of a large amount of single-chip microcomputers, and practical application is very difficult.
And circuit of the present utility model will utilize mimic channel, PWM voltage in 100us is carried out to integration, obviously this integrated value is directly proportional to actual output voltage, so only need after 100us, measure this integrated value, can accurately obtain corresponding motor terminal voltage amplitude, now the sample frequency of single-chip microcomputer only needs 10kHz, and precision determines by the performance of hardware integrator, does not take scm software resource.So the utility model, in the situation that improving voltage sample precision, will significantly reduce the required sample frequency of control system, reduce system cost.
Therefore, by measurement mechanism circuit of the present utility model, the control system of general industry motor just can obtain the terminal voltage of motor by lower sample frequency, contributes to electric machines control technology development.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is further described:
Fig. 1 is alternating-current variable frequency motor control system structure composition schematic block diagram;
Fig. 2 is conventional AC variable-frequency motor control system structure composition schematic block diagram;
Fig. 3 is the alternating-current variable frequency motor control system structure composition schematic block diagram that adopts the set end voltage measurement mechanism of alternating-current variable frequency motor described in the utility model;
Fig. 4 is the structural principle block diagram of the set end voltage measurement mechanism of alternating-current variable frequency motor described in the utility model;
Fig. 5 is the various signature tune line charts of the set end voltage measurement mechanism of alternating-current variable frequency motor described in the utility model;
In figure: 1. direct supply, 2. inverter, 3. alternating-current variable frequency motor, 4. electric machine controller, 5. voltage measuring apparatus.
Embodiment
Below in conjunction with accompanying drawing, the utility model is explained in detail:
Consult Fig. 2, conventional AC variable-frequency motor control system comprises direct supply 1, inverter 2, alternating-current variable frequency motor 3, electric machine controller 4, direct supply 1 output terminal is connected with the input end of inverter 2 by DC bus, and the output terminal of inverter 2 is connected with motor 3 by three-phase power line;
Conventional AC variable-frequency motor control system is to measure DC side voltage of converter value Vdc, utilizes DC side voltage of converter value Vdc to calculate the voltage feedback signal of alternating-current variable frequency motor set end voltage value Vac as electric machine controller 4.The accurately nonlinear effect of taking into account inverter 2 of alternating-current variable frequency motor set end voltage value that this classic method calculates, thus cause the motor set end voltage Vac error of feedback relatively large, be unfavorable for the control of high-performance motor.
Consult Fig. 3, the utility model has increased voltage measuring apparatus 5 on conventional AC variable-frequency motor control system basis, voltage measuring apparatus 5 is connected between inverter 2 and electric machine controller 4, PWM voltage (the being motor 3 terminal voltages) side of the input termination inverter 2 of voltage measuring apparatus 5, the output terminal of voltage measuring apparatus 5 is connected with electric machine controller 4 input end electric wires.Voltage measuring apparatus 5 is used for measuring inverter 2 output voltage values Vac, and the impact of inverter 2 when this value has been eliminated indirect measurement motor terminal voltage signal, can obtain motor 3 terminal voltages more accurately.
Consult Fig. 4, the voltage measuring apparatus 5 the utility model proposes is by sensor, sampling resistor, No. 1 integrator and No. 2 integrator compositions, wherein integrator is mainly to utilize the integrating circuit of operational amplifier to realize, and the concurrent working identical with No. 2 integrator hardware configurations of No. 1 integrator.
The effect of sensor is exported high pressure converted by inverter 2 and is become low tension signal, and low tension signal could be used by AD sampling module.Select when sensor mainly to consider tested voltage range that output signal can be selected the sensor of HV-C04 series while specifically enforcement;
The effect of integrator is to utilize the integrating circuit of operational amplifier to obtain voltage analog, this is core of the present utility model, the performance of integrator determines to collect the precision of voltage, in the design of integrator, also should possess and enable and function of reset, while specifically enforcement, integrator can adopt the integrating circuit of Design of Amplifiers also can select ready-made integrator.
The output terminal of sensor connects one end of sampling resistor by electric wire, the other end access integrator of sampling resistor, and two integrators connect the I/O mouth of electric machine controller 4 simultaneously with electric wire, and sampling resistor and No. 1 integrator and No. 2 integrators are welded on same circuit board.
Embodiment one, one end electric wire of the Chip-R that the output terminal Vc of HV-C04 series sensor is 0201 with model is connected, model is that the Uin of the Uin end of the other end of 0201 Chip-R No. 1 integrator that is simultaneously DIN with model No. 2 integrators that are DIN with model holds electric wire to be connected, model is that the Uout end of No. 1 integrator of DIN No. 2 integrators that are DIN with model is connected with the I/O mouth electric wire of control panel in electric machine controller, and No. 2 integrators that Chip-R, the model that model is 0201 is DIN No. 1 integrator and model are DIN are welded on same circuit board.
Embodiment two, Chip-R one end electric wire that the output terminal OUT of LV25-P series sensor is 0402 with model is connected, model is that the Uin end of No. 1 integrator and the Uin of No. 2 integrators that model is OEM that the other end of 0402 Chip-R is OEM with model simultaneously holds electric wire to be connected, model is that the Uout end of No. 1 integrator of OEM No. 2 integrators that are OEM with model is connected with the I/O mouth electric wire of control panel in electric machine controller, and No. 2 integrators that Chip-R, the model that model is 0402 is OEM No. 1 integrator and model are OEM are welded on same circuit board.
Use the principle of work of the alternating-current variable frequency motor control system of voltage measuring apparatus described in the utility model:
Direct supply 1 is supplied with inverter 2 by DC bus by DC voltage, and inverter 2 converts the DC voltage of input, and the three-phase square wave PWM voltage that conversion obtains is worked for alternating-current variable frequency motor 3.
Electric machine controller 4 gathers alternating-current variable frequency motor 3 terminal voltage value Vac that voltage measuring apparatus 5 measures for alternating-current variable frequency motor 3 (compare and regulate the output voltage values of inverter 2 or carry out the work such as position-sensor-free rotor-position estimation with demand voltage), makes alternating-current variable frequency motor 3 reach demand duty.
Consult Fig. 5, the principle of work of the set end voltage measurement mechanism of alternating-current variable frequency motor described in the utility model:
Electric machine controller arranges I/O pin and sends and enable control signal, timesharing enables No. 1 integrator and No. 2 integrators, No. 1 integrator and No. 2 integrators are by cycle alternation, enable No. 1 integrator (enabling integrator curve in figure No. 1) in first cycle T, the square wave PWM voltage signal of the high speed that No. 1 integrator collects sensor carries out monocycle sample and integral-maintenance, and the output voltage signal of integrator is as shown in No. 1 integrator curve of output in figure; Second period is reset No. 1 integrator, No. 1 integrator keeps integrated value, enable No. 2 integrators (enabling integrator curve in figure No. 2), No. 2 integrators collect square wave PWM voltage signal at a high speed by sensor and carry out monocycle sample and integral-maintenance, and the output voltage signal of integrator is as shown in No. 2 integrator curves of output in figure.
Electric machine controller arranges I/O pin and sends the time sharing sampling control (sampled signal 1 in sampling control signal figure and sampled signal 2) of sampling control signal to No. 1 integrator and No. 2 integrator output valves, obtain total output voltage values (total curve of output in figure), this magnitude of voltage is motor terminal voltage value.
Utilize voltage measuring apparatus can accurately obtain motor terminal voltage, and integrator adopt high performance operational amplifier integrating circuit realize, simple and reliable, cost is low.
Claims (4)
1. a set end voltage measurement mechanism for alternating-current variable frequency motor, is characterized in that, described alternating-current variable frequency motor set end voltage measurement mechanism comprises sensor, sampling resistor, No. 1 integrator and No. 2 integrators;
The output terminal of sensor is connected with one end electric wire of sampling resistor, and the other end of sampling resistor is connected with one end electric wire of No. 2 integrators with No. 1 integrator simultaneously.
2. according to the set end voltage measurement mechanism of alternating-current variable frequency motor claimed in claim 1, it is characterized in that, described sensor is selected the sensor of HV-C04 series, it is 0201 Chip-R that sampling resistor is selected model, and it is No. 1 integrator of DIN and No. 2 integrators that model is DIN that No. 1 integrator and No. 2 integrators are selected model;
One end electric wire of the Chip-R that the output terminal Vc of the sensor of HV-C04 series is 0201 with model is connected, model is that the Uin of the Uin end of the other end of 0201 Chip-R 0201 No. 1 integrator that is DIN with model No. 2 integrators that are DIN with model holds electric wire to be connected, and No. 2 integrators that Chip-R, the model that model is 0201 is DIN No. 1 integrator and model are DIN are welded on same circuit board.
3. according to the set end voltage measurement mechanism of alternating-current variable frequency motor claimed in claim 1, it is characterized in that, described sensor is selected the sensor of LV25-P series, it is 0402 Chip-R that sampling resistor is selected model, and it is No. 1 integrator of OEM and No. 2 integrators that model is OEM that No. 1 integrator and No. 2 integrators are selected model;
One end electric wire of the Chip-R that the output terminal OUT of the sensor of LV25-P series is 0402 with model is connected, model is that the Uin of the Uin end of the other end of 0402 Chip-R No. 1 integrator that is OEM with model No. 2 integrators that are OEM with model holds electric wire to be connected, and No. 2 integrators that Chip-R, the model that model is 0402 is OEM No. 1 integrator and model are OEM are welded on same circuit board.
4. according to the set end voltage measurement mechanism of alternating-current variable frequency motor claimed in claim 1, it is characterized in that, the terminal voltage side electric wire that the input end of the set end voltage measurement mechanism of described alternating-current variable frequency motor is alternating-current variable frequency motor (3) by sensor and the PWM voltage side of inverter (2) is connected;
No. 1 described integrator is connected with the I/O mouth electric wire in electric machine controller (4) with the other end of No. 2 integrators simultaneously; Be that model is that the I/O mouth of control panel in the Uout end of No. 1 integrator of OEM No. 2 integrators that are OEM with model and electric machine controller (4) adopts the Uout of No. 2 integrators that electric wire is connected or model is DIN No. 1 integrator is DIN with model to hold and the I/O mouth employing electric wire of the middle control panel of electric machine controller (4) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320865048.XU CN203732614U (en) | 2013-12-25 | 2013-12-25 | Terminal voltage measuring device of AC variable frequency motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320865048.XU CN203732614U (en) | 2013-12-25 | 2013-12-25 | Terminal voltage measuring device of AC variable frequency motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203732614U true CN203732614U (en) | 2014-07-23 |
Family
ID=51202676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320865048.XU Expired - Fee Related CN203732614U (en) | 2013-12-25 | 2013-12-25 | Terminal voltage measuring device of AC variable frequency motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203732614U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713185A (en) * | 2013-12-25 | 2014-04-09 | 吉林大学 | Motor terminal voltage measuring instrument of alternating current frequency conversion motor |
-
2013
- 2013-12-25 CN CN201320865048.XU patent/CN203732614U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713185A (en) * | 2013-12-25 | 2014-04-09 | 吉林大学 | Motor terminal voltage measuring instrument of alternating current frequency conversion motor |
| CN103713185B (en) * | 2013-12-25 | 2016-06-01 | 吉林大学 | The set end voltage measuring apparatus of alternating-current variable frequency motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104569902B (en) | Digital type electric energy meter power consumption measuring device and method | |
| CN201773140U (en) | Alternating current and direct current hybrid electric field intensity measuring device | |
| CN104569904A (en) | Test device for testing direct current and even harmonic influence quantity of electric energy meter | |
| CN103176066A (en) | Digitization power quality monitoring device | |
| CN102062849A (en) | Calibrating device and method for DC electric energy meter | |
| CN100595597C (en) | Lightning arrester various waveform aging test device | |
| CN103018550A (en) | Novel electric energy measurement control module of filtering reactive compensation device | |
| CN103323663B (en) | The measuring method of a kind of Rectification Power Factor DC current and rectifier loss | |
| CN103023046B (en) | Based on the operating passing zero filtering reactive power compensator that dsp chip controls | |
| CN202522693U (en) | Device for detecting measure accuracy degree of electric energy meter | |
| CN103713185B (en) | The set end voltage measuring apparatus of alternating-current variable frequency motor | |
| CN203616605U (en) | An industrial-control-used DSP development board base plate | |
| CN203376390U (en) | Current true RMS detection circuit of motor soft starter | |
| CN203732614U (en) | Terminal voltage measuring device of AC variable frequency motor | |
| CN207611099U (en) | A kind of transducer testing system | |
| CN205157646U (en) | Electric energy metering circuit based on voltage controlled oscillator | |
| CN204142927U (en) | A kind of microcomputer type low-voltage AC/DC motor comprehensive test system | |
| CN203732615U (en) | Terminal voltage measuring instrument of AC variable frequency motor | |
| CN201177647Y (en) | Multiple waveform aging test apparatus of lightning arrester | |
| CN104345218A (en) | Reactance value measurement system and method for three-phase reactor | |
| CN205787992U (en) | Constant-current source control system | |
| CN108322069A (en) | A kind of three-phase current source type power supply and load integral control system | |
| CN204595079U (en) | 6/10kV high voltage electric node test and diagnostic device | |
| CN201397378Y (en) | Power system stabilizer test waveform recorder for detecting uncompensated property of excitation system of generator | |
| CN204101664U (en) | A kind of frequency converter performance testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20161225 |