CN214375156U - System for measuring rotary phase change and rotor magnetic pole deflection angle of permanent magnet synchronous motor - Google Patents
System for measuring rotary phase change and rotor magnetic pole deflection angle of permanent magnet synchronous motor Download PDFInfo
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- CN214375156U CN214375156U CN202023030481.0U CN202023030481U CN214375156U CN 214375156 U CN214375156 U CN 214375156U CN 202023030481 U CN202023030481 U CN 202023030481U CN 214375156 U CN214375156 U CN 214375156U
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- magnet synchronous
- synchronous motor
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Abstract
The utility model relates to an electron field, PMSM's the measurement system who becomes phase place and rotor magnetic pole deflection angle soon, including becoming encoder soon, becoming decoder soon, oscilloscope, NI signal acquisition box, host computer, voltage sensor. The rotary transformer encoder is arranged on a rotating shaft of the permanent magnet synchronous motor to be measured and is connected with the rotary transformer decoder; the Ch1 channel and the Ch2 channel of the oscilloscope are respectively connected with the R1 output terminal and the R2 output terminal, and the signal output end of the oscilloscope is connected with the NI signal acquisition box; the voltage sensor is connected with a three-phase winding U/V/W counter potential of the permanent magnet synchronous motor to be measured, and the signal output end of the rotary transformer decoder is connected with an NI signal acquisition box; the NI signal acquisition box is connected with the upper computer in a communication mode. The measuring system can be used for acquiring the rotating phase and the rotor magnetic pole deflection angle of the current permanent magnet synchronous motor of the motor.
Description
Technical Field
The utility model relates to an electron field especially relates to PMSM's parameter measurement system.
Background
At present of the rapid development of new energy motors, the occupancy rate of the new energy motors in the market is more and more, most of the new energy motors are permanent magnet synchronous motors, the rotating speed of the new energy motors can reach 20000rpm, and the permanent magnet synchronous motors are high in efficiency and high in power density and are mainstream driving motors on electric automobiles.
High quality control of permanent magnet synchronous motors requires accurate detection of the rotor electrical angle.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a PMSM's rotary phase change phase place and rotor magnetic pole deflection angle's measurement system to solve above-mentioned problem.
The utility model provides a technical problem can adopt following technical scheme to realize:
the system for measuring the rotary transformer phase of the permanent magnet synchronous motor and the deflection angle of the magnetic pole of the rotor is characterized by comprising a rotary transformer encoder, a rotary transformer decoder, an oscilloscope, an NI signal acquisition box, an upper computer and a voltage sensor,
the rotary encoder is installed on a rotating shaft of the permanent magnet synchronous motor to be measured, a rotor of the rotary encoder and the rotating shaft of the permanent magnet synchronous motor to be measured synchronously rotate, and the rotary encoder is provided with an R1 input terminal, an R2 input terminal, an S1 input terminal, an S2 input terminal, an S3 input terminal and an S4 input terminal;
the rotary transformer decoder is provided with an R1 output terminal, an R2 output terminal, an S1 output terminal, an S2 output terminal, an S3 output terminal and an S4 output terminal; the rotary transformer decoder is provided with an R1 input terminal, an R2 input terminal, an S1 input terminal, an S2 input terminal, an S3 input terminal and an S4 input terminal, and the rotary transformer encoder is provided with an R1 output terminal, an R2 output terminal, an S1 output terminal, an S2 output terminal, an S3 output terminal and an S4 output terminal which are respectively connected in a one-to-one correspondence manner;
the oscilloscope is provided with a Ch1 channel and a Ch2 channel, the Ch1 channel and the Ch2 channel of the oscilloscope are respectively connected with an R1 output terminal and an R2 output terminal, and a signal output end of the oscilloscope is connected with one signal input end of the NI signal acquisition box;
the voltage sensor is connected with a three-phase winding U/V/W back electromotive force of the permanent magnet synchronous motor to be measured, and the signal output end of the rotary transformer decoder is connected with the other signal input end of the NI signal acquisition box;
and the NI signal acquisition box is in communication connection with the upper computer.
Has the advantages that: the measuring system can be used for acquiring the rotating phase and the rotor magnetic pole deflection angle of the current permanent magnet synchronous motor of the motor.
Drawings
FIG. 1 is a circuit connection block diagram of the main components of the present invention;
FIG. 2 is a schematic diagram of the internal structure of AU6805IC chip;
fig. 3 shows the original signal of the rotary encoder.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further explained with reference to the specific drawings.
Referring to fig. 1, the system for measuring the rotary transformer phase and the rotor magnetic pole deflection angle of the permanent magnet synchronous motor mainly comprises a rotary transformer encoder, a rotary transformer decoder, an oscilloscope, an NI signal acquisition box, an upper computer and a voltage sensor.
About connection relation
The rotary encoder is mounted on a rotating shaft of the permanent magnet synchronous motor to be measured, a rotor of the rotary encoder rotates synchronously with the rotating shaft of the permanent magnet synchronous motor to be measured, and the rotary encoder is provided with an R1 input terminal, an R2 input terminal, an S1 input terminal, an S2 input terminal, an S3 input terminal and an S4 input terminal. The resolver decoder is provided with an R1 output terminal, an R2 output terminal, an S1 output terminal, an S2 output terminal, an S3 output terminal, and an S4 output terminal. The resolver decoder is provided with an R1 input terminal, an R2 input terminal, an S1 input terminal, an S2 input terminal, an S3 input terminal, and an S4 input terminal, and the resolver is provided with an R1 output terminal, an R2 output terminal, an S1 output terminal, an S2 output terminal, an S3 output terminal, and an S4 output terminal, which are connected in a one-to-one correspondence. The resolver decoder preferably incorporates an AU6805IC chip, and referring to fig. 2, the AU6805IC chip is provided with R/D conversion, and the R1 output terminal and R2 output terminal of the AU6805IC chip output a resolver excitation signal, preferably an excitation signal having an amplitude of 3.8V and a frequency of 10KHz ± 3%. The high-frequency excitation signal has strong anti-interference performance and can provide a better original excitation signal for the rotary encoder. The S1 output terminal and the S3 output terminal output a slew SIN +/SIN-signal, and the S2 output terminal/S4 output terminal output a slew COS +/COS-signal. And the A/B/Z is a digital signal of the SIN/COS signal after being decoded by the AU6805, wherein a Z-phase signal motor appears once in the process of one rotation. The rotary transformer decoder is provided with a power supply input end, and the input voltage of the power supply input end is 24V.
The oscilloscope is provided with a Ch1 channel and a Ch2 channel, the Ch1 channel and the Ch2 channel of the oscilloscope are respectively connected with the R1 output terminal and the R2 output terminal, and the signal output end of the oscilloscope is connected with one signal input end of the NI signal acquisition box. Two channels Ch1 and Ch2 of an oscilloscope are used for respectively measuring voltage waveforms of the output terminal of the terminal R1 and the output terminal R2 to ground. The voltage waveform to ground of the output terminal of R1 and the voltage waveform to ground of the output terminal of R2 are subtracted to obtain the excitation signal waveform, and the peak-to-peak value (Vpp) of the excitation signal waveform is the predetermined amplitude VREF of the spin-on excitation signal. The stimulus signal waveform can be obtained from oscilloscope calculations using the mathematical calculation functions of the oscilloscope and displayed on channels R1-R2, see fig. 3.
The voltage sensor is connected with the back electromotive force of a three-phase winding U/V/W of the permanent magnet synchronous motor to be measured, and the signal output end of the rotary transformer decoder is connected with the other signal input end of the NI signal acquisition box. The voltage sensor is preferably a DVL150 voltage sensor of LEM, and the corresponding conversion ratio is 10V/150V. The tested piece needs to be subjected to a rotation angle test at 1500rpm/min, the back electromotive force generated by the motor at the rotation speed is about 75.9V (effective value) and exceeds the range of the analog channel range of the FPGA (+ -10V), so that a voltage sensor is needed to perform voltage conversion and voltage limitation on the back electromotive force, and the converted effective value of the voltage is ensured not to exceed 10V. The converted collection voltage of the DVL150 voltage sensor of the LEM at 1500rpm was approximately 5.06V.
The NI signal acquisition box is connected with the upper computer in a communication mode. The NI signal acquisition box preferably adopts an NI FPGA-7842R high-speed acquisition board card for signal acquisition, the board card has an internal clock with the frequency of 40MHz for high-speed acquisition of the number, and simultaneously has 8 analog channels, and each channel supports the maximum sampling frequency of 200 k.
About the measuring method
Firstly, a rotary encoder is installed on a rotating shaft of the permanent magnet synchronous motor to be measured, so that a rotor of the rotary encoder and the rotating shaft of the permanent magnet synchronous motor to be measured rotate synchronously. The voltage sensor is connected to the back electromotive force of the three-phase winding U/V/W of the permanent magnet synchronous motor to be measured.
And then, dragging the permanent magnet synchronous motor to be measured to a constant rotating speed of 1500rpm/min, enabling the permanent magnet synchronous motor to be measured to rotate at the rotating speed of 1500rpm for a set time (the number of the set turns can be set, and is preferably more than 2-3 turns), acquiring a U-phase waveform output by an oscilloscope at the rotating speed of 1500rpm and UV (ultraviolet) back electromotive force output by a voltage sensor by an NI signal acquisition box, and then reducing the rotating speed to 0 rpm/min.
Then, computational analysis was performed:
calculation of rotary deflection angle
Recording the time of passing through an electrical absolute 0 point of UV back electromotive force, recording the time of passing through an electrical absolute 0 point of U-phase waveform, subtracting 2 times to obtain a time difference value, converting the time difference value into a rotation angle without adopting a mode of multiplying 1500rpm/min by the time difference in consideration of the rotation jitter, and calculating the rotation angle by using an electrical phase angle, namely:
wherein T isUV-rotational transformation of U phaseThe time difference of the over-electric absolute 0 point and the spin-change U-phase rising edge in the rising edge of the UV back electromotive force on the x axis is TUV complete sine waveIs a full UV2 back emf sine wave corresponding to the time difference algorithmThe cumulative duration of a period, because the motor drives the rotary encoder to rotate for one circle is 360 degrees in the strict sense, and the motor and the rotary encoder are both 4 pairs of poles, the periods of the UV back electromotive force sine waves are 90 degrees in the strict sense, and through reverse thrust, a group (40 samples) of rotary angle calculation results are obtained as follows:
the calculated data corresponded exactly to the waveform with the maximum and minimum range at 0.3163 deg., with less error.
The motor back electromotive force and rotary change signal processing method comprises the following steps: when the rotation angle is measured, the measured motor shaft is dragged to rotate anticlockwise to the positive direction. If the motor is dragged reversely, the conversion relation between the measured rotation angle theta and the rotation angle theta under the forward dragging working condition is as follows: the forward direction theta is 180 theta-reverse direction theta. The spin angle measured when the UV back emf is later in the waveform than the spin UG to a value of 0 is positive. The original waveform of the tested UV back electromotive force needs to be changed by FFT, 1-order analysis is taken to be used as a back FTT reduction waveform, and then a rotation angle is calculated.
PMSM's the measurement system who becomes phase place and rotor magnetic pole deflection angle soon, still include the base, the left side of base is fixed with a support frame, the support frame comprises the cylindrical head that is located the top and the cylindrical bottom that is located the below, head cavity forms well cavity, cavity intracavity detachable is equipped with the shaft coupling, it is located the left side of support frame to become the encoder soon, the rotor that becomes the encoder soon stretches into in the cavity, and connect the one end of shaft coupling, the PMSM that awaits measuring is located the right side of support frame, the PMSM's that awaits measuring pivot can stretch into in the cavity, and connect the other end of shaft coupling. This patent uses the shaft coupling to be connected the rotor of rotary encoder and PMSM's pivot, allows to pass through to change the shaft coupling, can solve motor shaft thickness inequality, the relation of connection of pivot and rotor. Therefore, the measuring system of the patent can measure motors with various specifications without receiving the image of the size of the rotating shaft of the motor. The base is also provided with a supporting platform which can be lifted up and down, and the supporting platform is positioned on the right side of the supporting frame. The supporting table is used for containing the permanent magnet synchronous motor, the lifting of the supporting table can be utilized, the belt measuring motor on the supporting table moves up and down until the rotating shaft can be inserted into the hollow cavity, and the central axis of the rotating shaft and the central axis of the rotor are basically horizontal, so that the motors with different heights are allowed to be measured. The port department that well cavity is located the right side is equipped with pressure sensor, and pressure sensor has four at least, and four pressure sensors are equidistant arranges. Therefore, the alignment condition of the rotating shaft of the motor and the rotor of the rotary encoder can be judged through the pressure condition of the pressure sensor. The hollow cavity can be divided into two parts and is formed by buckling the two divided parts. Thereby conveniently getting through the convenient mode of two parts open and putting the shaft coupling.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The system for measuring the rotary transformer phase of the permanent magnet synchronous motor and the deflection angle of the magnetic pole of the rotor is characterized by comprising a rotary transformer encoder, a rotary transformer decoder, an oscilloscope, an NI signal acquisition box, an upper computer and a voltage sensor,
the rotary encoder is installed on a rotating shaft of the permanent magnet synchronous motor to be measured, a rotor of the rotary encoder and the rotating shaft of the permanent magnet synchronous motor to be measured synchronously rotate, and the rotary encoder is provided with an R1 input terminal, an R2 input terminal, an S1 input terminal, an S2 input terminal, an S3 input terminal and an S4 input terminal;
the rotary transformer decoder is provided with an R1 output terminal, an R2 output terminal, an S1 output terminal, an S2 output terminal, an S3 output terminal and an S4 output terminal; the rotary transformer decoder is provided with an R1 input terminal, an R2 input terminal, an S1 input terminal, an S2 input terminal, an S3 input terminal and an S4 input terminal, and the rotary transformer encoder is provided with an R1 output terminal, an R2 output terminal, an S1 output terminal, an S2 output terminal, an S3 output terminal and an S4 output terminal which are respectively connected in a one-to-one correspondence manner;
the oscilloscope is provided with a Ch1 channel and a Ch2 channel, the Ch1 channel and the Ch2 channel of the oscilloscope are respectively connected with an R1 output terminal and an R2 output terminal, and a signal output end of the oscilloscope is connected with one signal input end of the NI signal acquisition box;
the voltage sensor is connected with a three-phase winding U/V/W back electromotive force of the permanent magnet synchronous motor to be measured, and the signal output end of the rotary transformer decoder is connected with the other signal input end of the NI signal acquisition box;
and the NI signal acquisition box is in communication connection with the upper computer.
2. The system for measuring the rotating phase and the rotor pole deflection angle of the permanent magnet synchronous motor as claimed in claim 1, wherein the rotating encoder is internally provided with an AU6805IC chip.
3. The system for measuring the rotating phase and the rotor magnetic pole deflection angle of the permanent magnet synchronous motor as claimed in claim 2, wherein the output terminals R1 and R2 of the AU6805IC chip output excitation signals with amplitude of 3.8V and frequency of 10KHz +/-3%.
4. The system for measuring the rotational phase and the rotor pole deflection angle of a permanent magnet synchronous motor according to claim 1, wherein the voltage sensor is a DVL150 voltage sensor of LEM.
5. The system for measuring the rotary phase change angle and the rotor magnetic pole deflection angle of the permanent magnet synchronous motor according to claim 1, wherein an NIFPGA-7842R high-speed acquisition board card is arranged in the NI signal acquisition box, the NIFPGA-7842R high-speed acquisition board card is provided with 8 analog channels, and each channel supports a maximum sampling frequency of 200 k.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023030481.0U CN214375156U (en) | 2020-12-16 | 2020-12-16 | System for measuring rotary phase change and rotor magnetic pole deflection angle of permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023030481.0U CN214375156U (en) | 2020-12-16 | 2020-12-16 | System for measuring rotary phase change and rotor magnetic pole deflection angle of permanent magnet synchronous motor |
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| CN214375156U true CN214375156U (en) | 2021-10-08 |
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| CN202023030481.0U Active CN214375156U (en) | 2020-12-16 | 2020-12-16 | System for measuring rotary phase change and rotor magnetic pole deflection angle of permanent magnet synchronous motor |
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