CN219979315U - Rotary position sampling system adopting soft decoding technology - Google Patents
Rotary position sampling system adopting soft decoding technology Download PDFInfo
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- CN219979315U CN219979315U CN202223415542.4U CN202223415542U CN219979315U CN 219979315 U CN219979315 U CN 219979315U CN 202223415542 U CN202223415542 U CN 202223415542U CN 219979315 U CN219979315 U CN 219979315U
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Abstract
A rotary position sampling system adopting soft decoding technology comprises an AD sampling module integrated in MCU; the AD sampling module comprises an excitation signal generating module and a rotation feedback signal sampling processing module; the excitation signal generation module outputs sine waves of differential signals, generates excitation signals after amplification processing and transmits the excitation signals to the rotary feedback signal sampling processing module; after receiving the excitation signal, the rotary feedback signal sampling processing module generates sine and cosine signals with variable amplitude, and the sine and cosine signals are input to a sampling pin of an AD sampling module of the MCU for conversion after being processed by a circuit to obtain sampling values of the two signals; the AD sampling module performs data sampling processing on sampling values of the two signals fed back, and obtains a real-time position angle of the motor through calculation; according to the scheme, the system cost is reduced by adopting the high-speed and high-precision AD sampling module integrated in the MCU, and the real-time performance and accuracy of position sampling are improved.
Description
Technical Field
The utility model relates to a rotary position sampling system adopting a soft decoding technology, and belongs to the technical field of motor correlation.
Background
Most of motors used for new energy electric vehicles are permanent magnet synchronous motors, real-time detection of the angle position of the motor is needed to control the rotating speed and torque of the motor, and most of position detection devices are rotary transformers.
Resolver (Resolver) is an electromagnetic sensor, which is mainly used for the measurement of angular position and angular velocity; the rotary transformer consists of a stator fixed during installation and a rotor installed on a shaft; the working principle of the rotary transformer is similar to that of a common transformer, a stator and a rotor of the rotary transformer can be regarded as a primary side and a secondary side of the transformer, a stator winding receives external exciting voltage, a rotor winding generates induced electromotive force through electromagnetic coupling, the induced electromotive force of the rotor winding can obtain a rotor rotating angle after being subjected to demodulation and other treatments, and therefore shaft angle position, angular speed and other data of a target structure are obtained.
In the rotary transformer decoding scheme, the conventional method is to select a special RDC chip of a rotary transformer to decode an analog signal output by the rotary transformer; a Resolver-to-Digital Converter (RDC) is a type of analog-to-digital conversion chip designed for rotary transformers, and can convert an electrical signal output by a rotary transformer, which is proportional to the sine value and/or the cosine value of the angle of a rotary shaft, into a digital output corresponding to the angle and/or the angular velocity of the rotary shaft.
The special RDC chip can realize real-time decoding of the motor position and transmit the motor position to the MCU through data communication to realize a motor control algorithm, but the cost of the system is increased due to high price of the chip, and meanwhile, the system is difficult to monitor the running state in real time due to independent running of the chip.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a rotary position sampling system adopting a soft decoding technology, which reduces the system cost and improves the real-time performance and accuracy of position sampling.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a rotary position sampling system adopting soft decoding technology comprises an AD sampling module integrated in MCU; the AD sampling module comprises an excitation signal generating module and a rotation feedback signal sampling processing module; the excitation signal generation module outputs sine waves of differential signals, generates excitation signals after amplification processing and transmits the excitation signals to the rotary feedback signal sampling processing module; after receiving the excitation signal, the rotary feedback signal sampling processing module generates sine and cosine signals with variable amplitude, and the sine and cosine signals are input to a sampling pin of an AD sampling module of the MCU for conversion after being processed by a circuit to obtain sampling values of the two signals; and the AD sampling module performs data sampling processing on sampling values of the two signals fed back, and obtains a real-time position angle of the motor through calculation.
In a preferred embodiment, the excitation signal is a sinusoidal signal having a frequency of 10KHz and a peak-to-peak value of 12V.
In a preferred scheme, the impedance of the rotary excitation winding in the rotary feedback signal sampling processing module is 120 ohms.
In a preferred embodiment, the driving capability of the excitation signal is 100 milliamperes or more.
In a preferred embodiment, the drive capacity of the excitation signal is 1 ampere.
In a preferred embodiment, the sampled values of the two signals are respectively a sine winding signal and a cosine winding signal.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
according to the rotary position sampling system adopting the soft decoding technology, through adopting the high-speed and high-precision AD sampling module integrated in the MCU, the sine wave of the differential signal is output by the excitation signal generating module, the excitation signal is generated after amplification processing and is transmitted to the rotary feedback signal sampling processing module, the sine and cosine signals with the amplitude changing are generated after the excitation signal is received by the rotary feedback signal sampling processing module, the sine and cosine signals are input to the sampling pins of the AD sampling module of the MCU after circuit processing to be converted, sampling values of the two signals are obtained, data sampling processing is carried out on the sampling values of the two signals, and the real-time position angle of the motor is obtained through internal calculation, so that the system cost is reduced, and the real-time property and accuracy of position sampling are improved.
Drawings
The technical scheme of the utility model is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a rotational position sampling system employing soft decoding in accordance with the present utility model;
FIG. 2 is a schematic diagram of an excitation signal generation circuit of a rotary position sampling system employing soft decoding technique according to the present utility model;
FIG. 3 is a schematic diagram of a processing circuit for sine and cosine winding signals of a rotary position sampling system employing soft decoding technique according to the present utility model;
wherein: 1. an AD sampling module; 2. an excitation signal generation module; 3. and the rotary feedback signal sampling processing module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
The utility model will be described in further detail with reference to the accompanying drawings and specific examples.
FIG. 1 is a schematic diagram of a rotational position sampling system using soft decoding technique according to the present utility model, including an AD sampling module 1 integrated in an MCU; the AD sampling module 1 comprises an excitation signal generating module 2 and a rotary feedback signal sampling processing module 3; the excitation signal generation module 2 outputs sine waves of differential signals, generates excitation signals after amplification processing, and transmits the excitation signals to the rotary feedback signal sampling processing module 3, wherein the excitation signals are sine signals with the frequency of 10KHz and the peak-to-peak value of 12V; after receiving the excitation signal, the rotary feedback signal sampling processing module 3 generates sine and cosine signals with variable amplitude, and the sine and cosine signals are input to a sampling pin of the AD sampling module 1 of the MCU for conversion after being processed by a circuit to obtain sampling values of the two signals; the AD sampling module 1 performs data sampling processing on sampling values of two signals fed back, and obtains a real-time position angle of the motor through calculation, wherein the sampling values of the two signals are respectively sine winding signals and cosine winding signals.
Because the impedance of the rotary excitation winding in the rotary feedback signal sampling processing module 3 is usually 120 ohms, the driving capability of the excitation signal needs to be more than or equal to 100 milliamperes, and the scheme adopts the operational amplifier NCV0732 with the output driving capability reaching 1 ampere.
FIG. 2 shows an excitation signal generating circuit, in which RDC20COM and RDC20RSO output sine waves of differential signals with the frequency of 10KHz, and after the amplification treatment of OPA2171 and NCV0732, excitation signals with the peak-to-peak value of 12V and the frequency of 10KHz are obtained and output to an excitation winding of a rotary transformer.
Fig. 3 is a processing circuit of sine winding signals and cosine winding signals, after excitation signals are applied to excitation windings, sine winding signals and cosine winding signals with amplitude changing are generated, the sine signals and the cosine signals are processed by the circuit and then are input into an AD sampling pin of an MCU for conversion, sampling values of the sine winding signals and the cosine winding signals are obtained, and the position angle of the motor can be obtained after processing by an internal formula.
According to the rotary position sampling system adopting the soft decoding technology, through adopting the high-speed and high-precision AD sampling module 1 integrated in the MCU, the sine wave of the differential signal is output by the excitation signal generating module 2, the excitation signal is generated after amplification processing and is transmitted to the rotary feedback signal sampling processing module 3, the sine and cosine signals with the amplitude changing are generated after the rotary feedback signal sampling processing module 3 receives the excitation signal, the sine and cosine signals are input to the sampling pins of the AD sampling module 1 of the MCU for conversion after circuit processing, the sampling values of the two signals are obtained, the data sampling processing is carried out on the sampling values of the two signals fed back, and the real-time position angle of the motor is obtained through internal calculation, so that the system cost is reduced, and the real-time performance and accuracy of position sampling are improved.
The above is only a specific application example of the present utility model, and the protection scope of the present utility model is not limited at all, and the technical solution formed by adopting equivalent transformation or equivalent substitution falls within the protection scope of the present utility model.
Claims (6)
1. A rotary position sampling system adopting soft decoding technology is characterized in that: the device comprises an AD sampling module integrated in the MCU; the AD sampling module comprises an excitation signal generating module and a rotation feedback signal sampling processing module; the excitation signal generation module outputs sine waves of differential signals, generates excitation signals after amplification processing and transmits the excitation signals to the rotary feedback signal sampling processing module; after receiving the excitation signal, the rotary feedback signal sampling processing module generates sine and cosine signals with variable amplitude, and the sine and cosine signals are input to a sampling pin of an AD sampling module of the MCU for conversion after being processed by a circuit to obtain sampling values of the two signals; and the AD sampling module performs data sampling processing on sampling values of the two signals fed back, and obtains a real-time position angle of the motor through calculation.
2. A rotational position sampling system employing soft decoding techniques as claimed in claim 1, wherein: the excitation signal is a sine signal with the frequency of 10KHz and the peak-to-peak value of 12V.
3. A rotational position sampling system employing soft decoding techniques as claimed in claim 2, wherein: the impedance of the rotary excitation winding in the rotary feedback signal sampling processing module is 120 ohms.
4. A rotational position sampling system employing soft decoding techniques as claimed in claim 3, wherein: the driving capability of the excitation signal is more than or equal to 100 milliamperes.
5. A rotational position sampling system employing soft decoding techniques as recited in claim 4, wherein: the driving capability of the excitation signal is 1 ampere.
6. A rotational position sampling system employing soft decoding techniques as claimed in claim 1, wherein: the sampling values of the two signals are respectively sine winding signals and cosine winding signals.
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| CN202223415542.4U CN219979315U (en) | 2022-12-20 | 2022-12-20 | Rotary position sampling system adopting soft decoding technology |
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| CN202223415542.4U CN219979315U (en) | 2022-12-20 | 2022-12-20 | Rotary position sampling system adopting soft decoding technology |
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