CN215344424U - Position decoding system of reluctance type rotary transformer - Google Patents
Position decoding system of reluctance type rotary transformer Download PDFInfo
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- CN215344424U CN215344424U CN202121677857.9U CN202121677857U CN215344424U CN 215344424 U CN215344424 U CN 215344424U CN 202121677857 U CN202121677857 U CN 202121677857U CN 215344424 U CN215344424 U CN 215344424U
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Abstract
The application relates to a position decoding system of a reluctance type rotary transformer, which comprises a power supply module, a main chip module, an excitation buffer module, a signal conditioning module and the reluctance type rotary transformer; the power supply module comprises a booster circuit and a buck circuit, the booster circuit is connected with the excitation buffer module, and the buck circuit is connected with the main chip module; the main chip module is respectively connected with the excitation buffer module and the signal conditioning module; the input end of the reluctance type rotary transformer is connected with the excitation buffering module, and the output end of the reluctance type rotary transformer is connected with the signal conditioning module. The utility model can select the respective rate according to the actual requirement, improves the detection precision and the transportability, reduces the volume, is easy to install and disassemble, and is suitable for various servo closed-loop motor control systems.
Description
Technical Field
The application relates to the technical field of motor control, in particular to a position decoding system of a reluctance type rotary transformer.
Background
With the increasing consumption of petroleum energy and the rapid development of new energy automobiles, the fourteen-five plans particularly indicate the development targets of 'carbon peak reaching and carbon neutralization', the development trend that an electric automobile can certainly become future development can be predicted, a driving motor is the core of the automobile in the working condition operation of the electric automobile, and the follow-up performance of the motor has high technical requirements in the processes of starting, decelerating, accelerating, stopping, changing lanes, turning, ascending and descending of the automobile, so that the improvement of the follow-up performance of a servo motor has important significance.
The reluctance type rotary transformer is a sensor for detecting the position information of a motor rotor, has simple structure, high precision and strong anti-interference performance, and can adapt to various complex environments. The windings are all positioned on the stator, electromotive force with motor rotor position information is generated by changing air gap magnetic resistance, and the rotor position can be obtained by resolving through a decoding system.
The traditional servo motor system mostly adopts a potentiometer and an angle sensor to acquire position information of a motor, an output analog signal needs to be subjected to noise reduction and filtering and then is output to an A/D conversion circuit to calculate the position information of the motor, and the resolution and the precision of the servo motor system can be influenced under a complex environment generally.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a position decoding system of a reluctance type rotary transformer, which can select the respective rate according to actual requirements and improve the detection precision and the transportability.
The technical scheme adopted by the utility model is as follows: a position decoding system of a reluctance type rotary transformer comprises a power supply module, a main chip module, an excitation buffer module, a signal conditioning module and the reluctance type rotary transformer;
the power module comprises a boosting circuit and a voltage reduction circuit, the output end of the boosting circuit is connected with the excitation buffer module, and the output end of the voltage reduction circuit is connected with the main chip module;
the main chip module comprises an integrated decoding chip and two indicator lights, and the two indicator lights are respectively connected with the integrated decoding chip and used for indicating whether the system is in an abnormal working state or not; the sine wave signal output by the main chip module is connected to the excitation buffer module;
the excitation buffer module comprises an operational amplifier and an OTL circuit, wherein the input end of the operational amplifier is connected with the integrated decoding chip, and the output end of the operational amplifier is connected with the OTL circuit; the OTL circuit adopts a single power supply for power supply, the circuit structure is complementary and symmetrical, the device parameters of corresponding devices in the symmetrical circuit are consistent, and the emitters of an NPN transistor and a PNP transistor in the OTL circuit are used as the output end of the OTL circuit and are connected with the reluctance type rotary transformer;
the signal conditioning module comprises a sine differential signal conditioning circuit and a cosine differential signal conditioning circuit, the sine differential signal conditioning circuit and the cosine differential signal conditioning circuit have the same structure and respectively comprise two resistors and a capacitor; one end of each resistor forms two signal input ends of the signal conditioning circuit, the other end of each resistor forms two output ends of the signal conditioning circuit, and the capacitor is connected with the two output ends of the signal conditioning circuit; two input ends of the sinusoidal differential signal conditioning circuit are connected with sinusoidal differential signals generated by the induction of the reluctance type rotary transformer, and two output ends of the sinusoidal differential signal conditioning circuit are connected with the integrated decoding chip; two input ends of the cosine differential signal conditioning circuit are connected with cosine differential signals generated by the magnetic resistance type rotary transformer in an induction mode, and two output ends of the cosine differential signal conditioning circuit are connected with the integrated decoding chip.
Further, the integrated decoding chip comprises an AD2S1210, an AD2S1200 and an AD2S 1205.
Further, the operational amplifier includes AD8626, AD8625, and AD 8627.
Furthermore, voltage dividing resistors are respectively connected in series between the two indicator lamps and the integrated decoding chip.
Further, the reluctance resolver is an angle sensor for absolute position tracking, and windings are all located on a stator to generate electromotive force with position information of a motor rotor by changing air gap reluctance.
Further, the output voltage of the output end of the voltage boosting circuit is 12V, and the output voltage of the output end of the voltage reducing circuit is 3.3V.
The utility model has the beneficial effects that: each module adopts a chip integration design, so that connecting circuits among the modules are simplified, the modules do not influence each other in work, interference such as harmonic waves, high-frequency noise and the like in detection signals is effectively reduced, and the stability and the detection precision of the circuit are improved; the utility model can reasonably select the resolution ratio according to the actual requirement of the user, and further improve the detection precision; the utility model adopts an integrated design, and each module is integrated on one PCB board, thereby reducing connecting wires with external equipment, reducing the volume and being easier to install and disassemble, thereby enhancing the transportability and being suitable for various servo closed-loop motor control systems.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a circuit diagram of a main chip module and a signal conditioning module according to an embodiment of the utility model;
FIG. 3 is a circuit diagram of an excitation buffer module according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a reference voltage module in an excitation buffer module according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a boost circuit according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a step-down circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a reluctance resolver according to an embodiment of the present invention.
The reference signs explain: the circuit comprises a power supply module 1, a main chip module 2, an excitation buffer module 3, a signal conditioning module 4, a magnetic resistance type rotary transformer 5, an LOT (low-index) first indicator lamp, a DOS (direction of arrival) second indicator lamp, a Q1-first NPN (negative-positive-negative) transistor, a Q2-second NPN transistor, a Q3-first PNP transistor and a Q4-second PNP transistor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and claims of this patent application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
As shown in fig. 1 to 7, a position decoding system of a reluctance resolver includes a power module 1, a main chip module 2, an excitation buffer module 3, a signal conditioning module 4, and a reluctance resolver 5;
the power module 1 comprises a voltage boosting circuit and a voltage reducing circuit, wherein the input ends of the voltage boosting circuit and the voltage reducing circuit are connected with an external power supply, the output end of the voltage boosting circuit is connected with the excitation buffer module 3, and the output end of the voltage reducing circuit is connected with the main chip module 2; the external power supply is a 5V power supply, the output voltage of the output end of the booster circuit is 12V, the output voltage of the output end of the voltage reduction circuit is 3.3V, and stable power supplies are respectively provided for the excitation buffer module 3 and the main chip module 2.
The main chip module 2 comprises an integrated decoding chip and two indicator lights, wherein the two indicator lights are respectively connected with the integrated decoding chip and are used for indicating whether the system is in an abnormal working state; the main chip module 2 is electrically connected with the excitation buffer module 3 and the DSP controller, and sine wave signals output by the main chip module 2 are connected to the excitation buffer module 3 to resolve rotor information and transmit the rotor information to the DSP controller. The integrated decoding chip may be AD2S1210, AD2S1200, or AD2S1205, and in the embodiment of the present invention, the integrated decoding chip uses AD2S 1210. The AD2S1210 integrated decoding chip comprises a programmable sine wave generator and a Type II servo loop. The sine wave generator is used for providing sine wave differential signals with the frequency of 2 kHz-20 kHz for the rotary transformer, the No. 38 pin and the No. 39 pin of the AD2S1210 integrated decoding chip are connected with the excitation buffer module 3, and the sine wave signals output by the sine wave generator are input into the excitation buffer module 3. The Type II servo loop is used for tracking and resolving a voltage signal output by the reluctance Type rotary transformer 5, and inputting resolved motor rotor information into the DSP controller. No. 34 pin of the AD2S1210 integrated decoding chip is connected with a first indicator light LOT, and No. 35 pin is connected with a second indicator light DOS; the first pilot lamp LOT and the second pilot lamp DOS are not connected with the integrated decoding chip one end and are connected with the step-down circuit output, are the pilot lamp power supply by the step-down circuit. First pilot lamp LOT is the logic low level, and when Type II servo loop lost to hindering the voltage signal tracking of formula resolver output, AD2S1210 integrated decoding chip' S No. 34 pin output low level, first pilot lamp LOT lights up and sends alarm signal, and the tracking of indicator voltage signal is lost. The second indicator lamp DOS is a logic low level, when the input signal of the reluctance type rotary transformer 5 exceeds a specified sine and cosine threshold, the pin 35 of the AD2S1210 integrated decoding chip outputs a low level, and the second indicator lamp DOS is turned on to send an alarm signal to indicate that the integrated decoding chip detects signal degradation. In the embodiment of the utility model, voltage dividing resistors are respectively connected in series between the first indicator light LOT and the integrated decoding chip and between the second indicator light DOS and the integrated decoding chip, and are used for serially dividing voltage to prevent the indicator lights from being burnt out.
The excitation buffer module 3 includes an operational amplifier and an OTL circuit. The operational amplifier can be AD8626, AD8625 or AD8627, and in the embodiment of the utility model, AD8626 is used as the operational amplifier. Two input ends EXC and NEXC of the operational amplifier are respectively connected with a pin number 38 and a pin number 39 of the integrated decoding chip, pins INA + and INB + of the operational amplifier are connected with a reference voltage module shown in figure 4, and the output end of the operational amplifier is connected with an OTL circuit. The OTL circuit adopts a single power supply to supply power, the boosting circuit supplies power to the OTL circuit, the power supply structure of the OTL circuit is complementary and symmetrical, and the device parameters of corresponding devices in the symmetrical circuit are consistent; in the OTL circuit, the emitters of the first NPN transistor Q1 and the first PNP transistor Q3 and the emitters of the second NPN transistor Q2 and the second PNP transistor Q4 are respectively used as two output terminals EXC + and EXC "of the OTL circuit and are connected to the magneto-resistive resolver 5.
The sine wave signal output by the integrated decoding chip is subjected to gain amplification through the excitation buffer module 3 to form two paths of sine differential excitation voltage signals which are output to the reluctance type rotary transformer 5. The reluctance type rotary transformer 5 induces sine and cosine voltage signals which are orthogonal to each other through an excitation voltage signal, and then the sine and cosine voltage signals are input into the main chip module 2 through the signal conditioning module 4 to be subjected to A/D conversion and decoding, and finally position and speed information of the motor rotor is obtained.
The signal conditioning module 4 comprises a sine differential signal conditioning circuit and a cosine differential signal conditioning circuit, and the sine differential signal conditioning circuit and the cosine differential signal conditioning circuit have the same structure and respectively comprise two resistors and a capacitor; the two resistors and the capacitor form a low-pass filter to eliminate high-frequency noise and common-mode interference of sine and cosine voltage signals. One end of each resistor forms two signal input ends of the signal conditioning circuit, the other end of each resistor forms two output ends of the signal conditioning circuit, and the capacitor is connected with the two output ends of the signal conditioning circuit; two input ends SIN + and SIN-of the sinusoidal differential signal conditioning circuit are connected with a sinusoidal differential signal generated by the induction of the reluctance type rotary transformer 5, and two output ends are connected with a pin No. 41 and a pin No. 42 of the integrated decoding chip; two input ends COS + and COS-of the cosine differential signal conditioning circuit are connected with a cosine differential signal generated by the magnetic resistance type rotary transformer 5 in an induction mode, and two output ends of the cosine differential signal conditioning circuit are connected with a No. 44 pin and a No. 45 pin of the integrated decoding chip.
In the embodiment of the present invention, the reluctance resolver 5 is an angle sensor for absolute position tracking, and windings are all located on a stator to generate electromotive force with position information of a motor rotor by changing air gap reluctance. By setting the states of the No. 1 pin and the No. 48 pin of the AD2S1210 integrated decoding chip, the working resolution of the embodiment of the utility model can be configured. By setting the states of the pins 36 and 37 of the AD2S1210 integrated decoding chip, the working mode of the integrated decoding chip can be switched. The integrated decoding chip has two working modes, namely a normal mode and a configuration mode, wherein the normal mode is used for reading the rotation angle position data, and the configuration mode is used for programming a register, and setting the resolution, the excitation voltage frequency and the fault detection threshold of the chip.
The utility model adopts the chip integration design for each module, simplifies the connection circuit among the modules, ensures that the work among the modules is not influenced mutually, effectively reduces the interference of harmonic waves, high-frequency noise and the like in detection signals, and improves the stability and the detection precision of the circuit. The utility model can reasonably select the resolution ratio according to the actual requirement of a user, the maximum can reach 16bit, the LSB of the motor position is measured in an experiment to be within 0.3 arc minute, the accuracy of the speed is within 0.06rps, and the accuracy of the detection is greatly improved. The core of the excitation buffer module 3 adopts an integrated operational amplifier chip AD8626, the AD8626 is a precise JFET input amplifier integrated chip, the normal working temperature is between-40 ℃ and +80 ℃, and the excitation buffer module has the characteristics of low power consumption, rail-to-rail output and single power supply operation; the boost circuit adopts an MP3213 chip, a switch with the length of omega of 3.5A and 0.18A is built in the boost circuit, the boost circuit has the characteristics of high efficiency and rapidity, the switch works at a high working frequency, noise interference can be effectively reduced, and meanwhile, the boost circuit also has the flexibility of an external compensation pin reinforcing loop. The utility model adopts an integrated design, and each module is integrated on one PCB board, thereby reducing connecting wires with external equipment, reducing the volume and being easier to install and disassemble, thereby enhancing the transportability and being suitable for various servo closed-loop motor control systems.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A position decoding system of a reluctance type rotary transformer is characterized by comprising a power supply module, a main chip module, an excitation buffer module, a signal conditioning module and the reluctance type rotary transformer;
the power module comprises a boosting circuit and a voltage reduction circuit, the output end of the boosting circuit is connected with the excitation buffer module, and the output end of the voltage reduction circuit is connected with the main chip module;
the main chip module comprises an integrated decoding chip and two indicator lights, and the two indicator lights are respectively connected with the integrated decoding chip and used for indicating whether the system is in an abnormal working state or not; the sine wave signal output by the main chip module is connected to the excitation buffer module;
the excitation buffer module comprises an operational amplifier and an OTL circuit, wherein the input end of the operational amplifier is connected with the integrated decoding chip, and the output end of the operational amplifier is connected with the OTL circuit; the OTL circuit adopts a single power supply for power supply, the circuit structure is complementary and symmetrical, the device parameters of corresponding devices in the symmetrical circuit are consistent, and the emitters of an NPN transistor and a PNP transistor in the OTL circuit are used as the output end of the OTL circuit and are connected with the reluctance type rotary transformer;
the signal conditioning module comprises a sine differential signal conditioning circuit and a cosine differential signal conditioning circuit, the sine differential signal conditioning circuit and the cosine differential signal conditioning circuit have the same structure and respectively comprise two resistors and a capacitor; one end of each resistor forms two signal input ends of the signal conditioning circuit, the other end of each resistor forms two output ends of the signal conditioning circuit, and the capacitor is connected with the two output ends of the signal conditioning circuit; two input ends of the sinusoidal differential signal conditioning circuit are connected with sinusoidal differential signals generated by the induction of the reluctance type rotary transformer, and two output ends of the sinusoidal differential signal conditioning circuit are connected with the integrated decoding chip; two input ends of the cosine differential signal conditioning circuit are connected with cosine differential signals generated by the magnetic resistance type rotary transformer in an induction mode, and two output ends of the cosine differential signal conditioning circuit are connected with the integrated decoding chip.
2. A position decoding system for a magnetoresistive resolver as claimed in claim 1, wherein the integrated decoding chip comprises AD2S1210, AD2S1200 and AD2S 1205.
3. A position decoding system of a reluctance resolver according to claim 1, wherein the operational amplifier comprises AD8626, AD8625 and AD 8627.
4. The position decoding system of a magnetic resistance type rotary transformer according to claim 1, wherein voltage dividing resistors are respectively connected in series between the two indicator lamps and the integrated decoding chip.
5. A position decoding system for a reluctance resolver according to claim 1, wherein the reluctance resolver is an absolute position tracking angle sensor, windings are all on the stator, and electromotive force with position information of the motor rotor is generated by changing the air gap reluctance.
6. A position decoding system for a magnetic resolver as claimed in claim 1, wherein the output voltage of the output terminal of the voltage increasing circuit is 12V, and the output voltage of the output terminal of the voltage decreasing circuit is 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121677857.9U CN215344424U (en) | 2021-07-22 | 2021-07-22 | Position decoding system of reluctance type rotary transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121677857.9U CN215344424U (en) | 2021-07-22 | 2021-07-22 | Position decoding system of reluctance type rotary transformer |
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| Publication Number | Publication Date |
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| CN215344424U true CN215344424U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121677857.9U Expired - Fee Related CN215344424U (en) | 2021-07-22 | 2021-07-22 | Position decoding system of reluctance type rotary transformer |
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| Country | Link |
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| CN (1) | CN215344424U (en) |
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- 2021-07-22 CN CN202121677857.9U patent/CN215344424U/en not_active Expired - Fee Related
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Granted publication date: 20211228 |