CN101826836B - Household appliance single-rotor compressor frequency conversion controller based on electric signals and implementation method - Google Patents

Abstract

The invention discloses a household appliance single-rotor compressor frequency conversion controller based on an electric signal and an implementation method, wherein the controller comprises a single-resistance detection circuit, a filtering and amplifying circuit, a fault elimination and software filtering module, a three-phase-to-two-phase system conversion module, a rotor position judgment module, a two-phase-to-three-phase conversion module and a three-phase electrifying time fan-shaped module which are sequentially connected; the rotor position judging module comprises a parameter input module, a low-pass filtering module, a current estimating module and a rotor position estimating module. The implementation method comprises the following steps: detecting three-phase current of the single-rotor compressor; (b) amplifying and judging the abnormality of the collected signals; (c) converting three-phase voltage into two-phase voltage; (d) estimating the position of a compressor rotor; (e) and controlling the compressor rotor to rotate. The invention has the advantages of rapid working condition stabilization, stable load, low energy consumption, low noise and the like.

Description

A frequency conversion controller for household appliance single-rotor compressor based on electric signal and its realization method

[technical field]

The invention relates to an electrical signal-based frequency conversion controller for a single-rotor compressor of a household appliance and a realization method thereof, which are specifically applied to frequency-variable speed regulation and control of single-rotor compressors in air conditioners, refrigerators, and washing machines.

[Background technique]

Frequency conversion technology can operate with the most suitable output power according to different working conditions. However, traditional fixed-frequency compressors can only be controlled in steps by continuously "on and off", which not only easily causes the controlled target to fluctuate up and down, but also consumes a lot of power. The frequency conversion control is to use the change of the operating frequency of the compressor to achieve the control purpose, so the fluctuation is small, the comfort is greatly improved, and the power consumption is also small. In particular, compared with traditional fixed-speed air conditioners, inverter air conditioners have the remarkable characteristics of high-performance operation, comfort and quietness, energy saving and environmental protection, and low energy consumption.

The current national macro policy is in the stage of adjusting structure and promoting transformation. The field of energy conservation and environmental protection has become a "sunrise industry" in my country. The Ministry of Finance and the National Development and Reform Commission announced the "Energy-saving Products Benefiting the People Project", which adopts financial subsidies to provide high-efficiency and energy-saving air conditioners, refrigerators, and motors with energy efficiency levels of 1 or above. Product promotion application. Therefore, the inverter compressor control technology has realistic and urgent practical significance for enterprise transformation and product upgrading.

The control of single-rotor home appliance compressors is a difficult point in the home appliance industry. Although there are certain research foundations and products at home and abroad, it has been proved from the perspective of the industry and practice that the development of this technology itself is far from meeting the needs of actual production. Form a comparative system and use the system. Therefore, it is still an important research content for the current development of the household appliance industry to carry out the research and industrialization technology of the frequency conversion control of the household appliance single-rotor compressor.

The core of frequency conversion control is to ensure that the feedback signals at high and low frequencies can be used to derive accurate rotor position correlation factors. From the perspective of drive technology, the compressor can be approximately regarded as a permanent magnet synchronous motor (PMSM). At low frequencies, the current and voltage changes of synchronous motors are small. Many scholars and engineers at home and abroad have conducted research on motor position estimation based on tiny signals. They have proposed modern methods such as neural networks and wavelet analysis, and have achieved certain results. However, these The technology has the disadvantages of huge amount of calculation, complex calculation means, and difficulty in practical application.

In addition, the existing frequency converter has the disadvantages of unstable load, high noise and high energy consumption during the process of fast frequency conversion.

[Content of the invention]

The present invention overcomes the disadvantages of the above-mentioned technologies, and provides a frequency conversion controller of a household appliance single-rotor compressor based on electrical signals and a realization method that can rapidly stabilize working conditions, stable load, low energy consumption, and low noise.

To achieve the above object, the present invention adopts the following technical solutions:

A variable frequency controller for single-rotor compressors of home appliances based on electrical signals, including a sequentially connected single-resistance detection circuit, a filter amplifier circuit, a troubleshooting and software filter module, a three-phase to two-phase system conversion module, and a rotor position determination module , a two-phase to three-phase conversion module, a three-phase power-on time sector module, an intelligent power module, the single resistance detection circuit is connected to the neutral line on the intelligent power module, and the intelligent power module is connected to the input end of the single-rotor compressor ;

The estimation of the position of the compressor rotor by the rotor position judging module is optimized as the frequency changes, and the rotor position judging module includes

The parameter input module introduces discrete voltage and current signals from the three-phase to two-phase system transformation module;

The low-pass filter module performs filter processing on the signal output by the parameter input module;

The current estimation module obtains the current estimation equation according to the two-phase current signal output by the low-pass filter module:

为当前转子角速度，e_M为当前旋转电动势，L_d为随动坐标系d-q下d轴电感值，L_q为随动坐标系d-q下q轴电感值； $\left[\begin{array}{c}{i}_{\mathrm{\γ}}\left(\mathrm{no}\right)\\ i_{\mathrm{\δ}}\left(\mathrm{no}\right)\end{array}\right]=\left[\begin{array}{cc}1-\frac{R}{L_d}T& {\stackrel{\&Center\; Dot;}{\mathrm{\θ}}}_m\frac{L_q}{L_d}T\\ -{\stackrel{\·}{\mathrm{\θ}}}_m\frac{L_d}{L_q}T& 1-\frac{R}{L_q}T\end{array}\right]\left[\begin{array}{c}{i}_{\mathrm{\γ}}(\mathrm{no}-1)\\ i_{\mathrm{\δ}}(\mathrm{no}-1)\end{array}\right]-e_m\left[\begin{array}{c}0\\ 1/L_q\end{array}\right],$ Among them, i _γ (n) is the estimated current value of the γ-axis under the estimated coordinate system γ-δ, i _δ (n) is the estimated current value of the δ-axis under the estimated coordinate system γ-δ, and i _γ (n -1) is the current value of the γ-axis in the estimated coordinate system γ-δ, i _δ (n-1) is the current value of the δ-axis in the estimated coordinate system γ-δ, R is the motor resistance, and T is the sampling cycle,

is the current angular velocity of the rotor, e _M is the current rotational electromotive force, L _d is the inductance value of the d-axis under the moving coordinate system dq, and L _q is the inductance value of the q-axis under the moving coordinate system dq;

The rotor position estimation module derives the rotor position angle estimation equation according to the current estimation equation in the current estimation module:

其中，e_M(n)为预估旋转电动势，e_M(n-1)为当前旋转电动势，Δi_γ(n)为预估坐标系γ-δ下γ轴的预估电流变化值，Δi_δ(n)为预估坐标系γ-δ下δ轴的预估电流变化值，θ_M(n)为γ-δ坐标轴下的预估转子位置角，

为预估坐标系γ-δ下的当前转子角速度，K_e、K_M为可调参数；

Among them, e _M (n) is the estimated rotational electromotive force, e _M (n-1) is the current rotational electromotive force, Δi _γ (n) is the estimated current change value of the γ axis in the estimated coordinate system γ-δ, Δi _δ (n) is the estimated current change value of the δ axis in the estimated coordinate system γ-δ, θ _M (n) is the estimated rotor position angle under the γ-δ coordinate axis,

To estimate the current rotor angular velocity in the coordinate system γ-δ, K _e and K _M are adjustable parameters;

The above estimated rotor position angle is obtained, so as to realize the estimation of the rotor position of the compressor in the next time period.

The rotor position estimation module divides the full frequency band of motor rotation into multiple frequency bands, and in each frequency band, the adjustable parameters K _e and K _M have a corresponding set of values to realize full frequency band parameter adjustment.

The single-rotor compressor frequency conversion controller for household appliances also includes

The upper computer or the system requires a frequency value setting module, through which the motor rotation frequency of the single-rotor compressor can be set according to requirements;

And the maximum torque and power modules with frequency thresholds set inside, connected between the rotor position estimation module of the rotor position determination module and the two-phase to three-phase conversion module, and at the same time communicate with the upper computer or the system required frequency value setting module connect;

When the upper computer or the system requires that the rotation frequency set by the frequency value setting module is lower than the frequency threshold, the maximum torque and power module outputs the maximum torque to control the motor of the single-rotor compressor; when the upper computer or the system requires the frequency value to be set When the rotation frequency set by the constant module is greater than the frequency threshold, the maximum torque and power module outputs the maximum frequency to control the motor of the single-rotor compressor.

The implementation method of the frequency conversion controller of the single-rotor compressor of the household appliance includes the following steps:

(a) Detect the three-phase current of the single-rotor compressor: through the single-resistance detection circuit, according to the set single-phase voltage energization sequence and time interval, collect 3 times to obtain the U, V, W three-phase current of the single-rotor compressor motor;

(b) Amplify the collected signal and judge abnormality: amplify the collected three-phase current through the filter amplifier circuit, and use the current sum formed after the three-phase source is symmetrical to be zero to determine whether the compressor exists through the troubleshooting and software filter module Abnormal situation of lack of phase;

(c) Three-phase voltage to two-phase voltage conversion: the three-phase discrete voltage signal output by the troubleshooting and software filtering module is converted into a two-phase discrete voltage signal through the three-phase to two-phase system conversion module, and then assigned to the rotor position determination module , to estimate the rotor position of the compressor in the next time period;

(d) Estimate compressor rotor position: introduce discrete voltage and current signals from the three-phase to two-phase system conversion module through the parameter input module in the rotor position determination module, and introduce the parameter input module through the low-pass filter module The signal is filtered, the current estimation equation is obtained by the current estimation module, and then the rotor position angle estimation equation is derived by the rotor position estimation module according to the current estimation equation, so as to realize the compression of the next time period Estimation of machine rotor position;

(e) Control the rotor of the compressor to rotate: through the two-phase to three-phase conversion module, the two-phase current in the current estimation equation is changed into three-phase, through the three-phase energization time fan module and the intelligent power module according to the rotor position angle The estimated rotor position angle in the estimated equation is used to control the rotation of the motor of the single-rotor compressor.

The beneficial effects of the present invention are:

1. The present invention proposes a home appliance single-rotor compressor control technology based on electrical signals, which avoids cumbersome calculations and theoretical derivations. From the perspective of practical engineering, combined with the characteristics of sudden changes in the working conditions of home appliances, the introduction of full-frequency variable parameter technology and voltage The linear model of current change has carried out the precise feedback of the signal link of the compressor and the precise conversion processing technology of the command signal, which can well realize the man-machine interface or the host computer command, achieve rapid and stable working conditions, and meet the characteristics of energy saving and low noise. .

2. The present invention integrates single-phase multi-phase conversion technology, compressor position observation model and position determination technology, full-frequency-based debugging technology, and intelligent power drive technology, and establishes a complete set of frequency conversion system, which provides a technical basis for frequency conversion of home appliances .

3. The present invention establishes a compressor positioning model based on feedback current and voltage signals, and corrects and optimizes the model parameters and variables within the operating frequency range of household appliances, which can realize the requirements of fast and less vibration frequency conversion of single-rotor compressors, and at the same time match in real time system load. On this basis, it communicates with the upper computer or the human-machine interface, and can realize the best energy-saving operation of household appliances in different modes or under different working conditions with simple operations by the user.

[Description of drawings]

A further detailed description will be made below in conjunction with the accompanying drawings and embodiments of the present invention:

Fig. 1 is the block diagram of controller of the present invention;

Fig. 2 is a block diagram of the rotor position determination module of the controller of the present invention.

[Detailed ways]

Referring to Fig. 1 and Fig. 2, the present invention introduces a frequency conversion controller for a single-rotor compressor of household appliances based on electrical signals, including a single-resistance detection circuit connected in sequence, a filter amplifier circuit, troubleshooting and software filter modules, three-phase to Two-phase system conversion module, rotor position determination module, two-phase to three-phase conversion module, three-phase energization time fan module, intelligent power module, the single resistance detection circuit is connected to the neutral line of the power module on the intelligent power module, and the The intelligent power module is connected to the input end of the single-rotor compressor;

The estimation of the compressor rotor position by the rotor position judging module is optimized as the frequency changes, and the rotor position judging module includes a parameter input module, a low-pass filter module, and a current estimation module.

The parameter input module introduces discrete voltage and current signals from the three-phase to two-phase system transformation module;

The low-pass filtering module performs filtering processing on the signal output by the parameter input module;

The current estimation module obtains the current estimation equation according to the two-phase current signal output by the low-pass filter module:

为当前转子角速度，e_M为当前旋转电动势，L_d为随动坐标系d-q下d轴电感值，L_q为随动坐标系d-q下q轴电感值； $\left[\begin{array}{c}{i}_{\mathrm{\γ}}\left(\mathrm{no}\right)\\ i_{\mathrm{\δ}}\left(\mathrm{no}\right)\end{array}\right]=\left[\begin{array}{cc}1-\frac{R}{L_d}T& {\stackrel{\·}{\mathrm{\θ}}}_m\frac{L_q}{L_d}T\\ -{\stackrel{\·}{\mathrm{\θ}}}_m\frac{L_d}{L_q}T& 1-\frac{R}{L_q}T\end{array}\right]\left[\begin{array}{c}{i}_{\mathrm{\γ}}(\mathrm{no}-1)\\ i_{\mathrm{\δ}}(\mathrm{no}-1)\end{array}\right]-e_m\left[\begin{array}{c}0\\ 1/L_q\end{array}\right],$ Among them, i _γ (n) is the estimated current value of the γ-axis under the estimated coordinate system γ-δ, i _δ (n) is the estimated current value of the δ-axis under the estimated coordinate system γ-δ, and i _γ (n -1) is the current value of the γ-axis in the estimated coordinate system γ-δ, i _δ (n-1) is the current value of the δ-axis in the estimated coordinate system γ-δ, R is the motor resistance, and T is the sampling cycle,

is the current angular velocity of the rotor, e _M is the current rotational electromotive force, L _d is the inductance value of the d-axis under the moving coordinate system dq, and L _q is the inductance value of the q-axis under the moving coordinate system dq;

The rotor position estimation module derives the rotor position angle estimation equation according to the current estimation equation in the current estimation module:

为预估坐标系γ-δ下的当前转子角速度，K_e、K_M为可调参数； Among them, e _M (n) is the estimated rotational electromotive force, e _M (n-1) is the current rotational electromotive force, Δi _γ (n) is the estimated current change value of the γ axis in the estimated coordinate system γ-δ, Δi _δ (n) is the estimated current change value of the δ axis in the estimated coordinate system γ-δ, θ _M (n) is the estimated rotor position angle under the γ-δ coordinate axis,

To estimate the current rotor angular velocity in the coordinate system γ-δ, K _e and K _M are adjustable parameters;

The above estimated rotor position angle is obtained, so as to realize the estimation of the rotor position of the compressor in the next time period.

The rotor position estimation module divides the full frequency band of motor rotation into multiple frequency bands, and in each frequency band, the adjustable parameters K _e and K _M have a corresponding set of values to realize full frequency band parameter adjustment.

In order to be able to set the rotation frequency of the motor according to the requirements, the variable frequency controller of the single-rotor compressor of the household appliance also includes a host computer or a system-required frequency value setting module and a maximum torque and power module;

The frequency value setting module required by the upper computer or the system can set the motor rotation frequency of the single-rotor compressor according to the requirements through this module;

There are frequency thresholds set in the maximum torque and power modules, which are connected between the rotor position estimation module of the rotor position determination module and the two-phase to three-phase conversion module, and are connected to the upper computer or the system required frequency value setting module at the same time ;

The maximum torque and power module selects the output according to the frequency input by the upper computer or the system required frequency value setting module. When the rotation frequency set by the upper computer or the system required frequency value setting module is lower than the frequency threshold, the maximum torque and the power module output the maximum torque to control the motor of the single-rotor compressor; when the upper computer or the system requires the rotation frequency set by the frequency value setting module to be greater than the frequency threshold, the maximum torque and power module outputs the maximum frequency to control the single-rotor compressor Rotary compressor motor.

In order to protect the single-rotor compressor, there is a filter circuit between the troubleshooting and software filter module and the live wire of the intelligent power module. The filter circuit monitors the bus voltage collected from the live pin of the intelligent power module to avoid excessive Undervoltage and undervoltage conditions, the filter circuit adopts digital low-pass filtering.

The present invention also introduces a method for realizing the frequency conversion controller of the household appliance single-rotor compressor, which includes the following steps:

(a) Detect the three-phase current of the single-rotor compressor: through the single-resistor detection circuit, according to the set single-phase voltage energization sequence and time interval, collect 3 times from the pin of the neutral line of the power module of the intelligent power drive module to obtain the single-rotor U, V, W three-phase AC current of the compressor motor;

(b) Amplify the collected signal and judge abnormality: convert the collected three-phase AC current through analog-to-digital conversion through the filtering and amplifying circuit, and perform filtering and amplifying; then, the troubleshooting and software filtering module utilizes the three-phase source to form a symmetrical The current sum of zero is used to further determine whether there is an abnormal condition of phase loss in the compressor, and then determine the current sector number sector according to the vector sector interval diagram (see related motor reference books for details), and then set the power-on sequence and time interval of each phase voltage.

(c) Three-phase voltage to two-phase voltage conversion: the three-phase discrete voltage signal output by the troubleshooting and software filtering module is converted into a two-phase discrete voltage signal through the three-phase to two-phase system conversion module, and then assigned to the rotor position determination module , to estimate the rotor position of the compressor in the next time period;

(d) Estimate compressor rotor position: introduce discrete voltage and current signals from the three-phase to two-phase system conversion module through the parameter input module in the rotor position determination module, and introduce the parameter input module through the low-pass filter module The signal is filtered, the current estimation equation is obtained by the current estimation module, and then the rotor position angle estimation equation is derived by the rotor position estimation module according to the current estimation equation, so as to realize the compression of the next time period Estimation of machine rotor position;

The single-rotor compressor position estimation is based on the derivation relationship established by the sensorless electrical signal position model. In the present invention, the concept of the linear equation of electrical signal difference is proposed, which can achieve as fast transportation as possible under the general IC chip resources. Specific method: the rotor compressor signal is divided into the current n state and the previous moment n-1 state, the coordinate system includes three, namely the original U, V, W three-phase voltage coordinate system, the two-phase follow-up coordinate system d, q, estimated front coordinate system γ, δ, feedback voltage and current values as input quantities, as well as constants of compressor and processing system. For the transformation equations of voltage, current and follow-up coordinates in the three-phase voltage coordinate system, please refer to the general motor drive literature.

In the current state and the state at the previous moment, the two-phase follow-up coordinates are obtained by mathematically discretely deriving the general electrical equation. The specific current estimation equation is:

为当前转子角速度，e_M为当前旋转电动势，L_d为随动坐标系d-q下d轴电感值，L_q为随动坐标系d-q下q轴电感值； $\left[\begin{array}{c}{i}_{\mathrm{\γ}}\left(\mathrm{no}\right)\\ i_{\mathrm{\δ}}\left(\mathrm{no}\right)\end{array}\right]=\left[\begin{array}{cc}1-\frac{R}{L_d}T& {\stackrel{\&Center\; Dot;}{\mathrm{\θ}}}_m\frac{L_q}{L_d}T\\ -{\stackrel{\&Center\; Dot;}{\mathrm{\θ}}}_m\frac{L_d}{L_q}T& 1-\frac{R}{L_q}T\end{array}\right]\left[\begin{array}{c}{i}_{\mathrm{\γ}}(\mathrm{no}-1)\\ i_{\mathrm{\δ}}(\mathrm{no}-1)\end{array}\right]-e_m\left[\begin{array}{c}0\\ 1/L_q\end{array}\right],$ Among them, i _γ (n) is the estimated current value of the γ-axis under the estimated coordinate system γ-δ, i _δ (n) is the estimated current value of the δ-axis under the estimated coordinate system γ-δ, and i _γ (n -1) is the current value of the γ-axis in the estimated coordinate system γ-δ, i _δ (n-1) is the current value of the δ-axis in the estimated coordinate system γ-δ, R is the motor resistance, and T is the sampling cycle,

is the current angular velocity of the rotor, e _M is the current rotational electromotive force, L _d is the inductance value of the d-axis under the moving coordinate system dq, and L _q is the inductance value of the q-axis under the moving coordinate system dq;

The positioning equation of the rotor position angle is derived by linear programming using the difference between voltage and current, and the rotor position angle estimation equation is:

为预估坐标系γ-δ下的当前转子角速度，K_e、K_M为可调参数； Among them, e _M (n) is the estimated rotational electromotive force, e _M (n-1) is the current rotational electromotive force, Δi _γ (n) is the estimated current change value of the γ axis in the estimated coordinate system γ-δ, Δi _δ (n) is the estimated current change value of the δ axis in the estimated coordinate system γ-δ, θ _M (n) is the estimated rotor position angle under the γ-δ coordinate axis,

To estimate the current rotor angular velocity in the coordinate system γ-δ, K _e and K _M are adjustable parameters;

(e) Control the rotor of the compressor to rotate: through the two-phase to three-phase conversion module, the two-phase current in the current estimation equation is changed into three-phase, through the three-phase energization time fan module and the intelligent power module according to the rotor position angle The estimated rotor position angle in the estimated equation is used to control the rotation of the motor of the single-rotor compressor.

Based on the parameter adjustment technology of the full frequency band, the rotor position estimation module divides the full frequency band of the motor rotation into N (N is a natural number greater than 2) frequency bands, and takes N+1 frequency points from small to large, and the frequency points The selection is generally based on the number of calculation digits and the limit frequency of the main chip. The maximum frequency is f _max , the minimum frequency is f _min , and the number of calculation digits is n _bit . Then the frequency point is: f _N ＝N*(f _max -f _min )/n _bits . In each frequency band, the two adjustable parameters K _e and K _M in the rotor position angle estimation equation have a corresponding set of values. At non-frequency points, the linear difference method is generally used for parameter debugging. In order to realize the parameter adjustment of the whole frequency band.

Step f control mode is also selected between step d and step e: set the motor rotation frequency of the single-rotor compressor according to the requirements through the upper computer or the system requirement frequency value setting module, and then set the frequency threshold through the internal The maximum torque and power module performs judgment processing. When the upper computer or the system requires the frequency value setting module to set the rotation frequency to be lower than the frequency threshold, the maximum torque and power module outputs the maximum torque to control the motor of the single-rotor compressor ; When the upper computer or the system requires that the rotation frequency set by the frequency value setting module is greater than the frequency threshold, the maximum torque and power module outputs the maximum frequency to control the motor of the single-rotor compressor.

Claims (6)

1. A frequency conversion controller for single-rotor compressors of home appliances based on electrical signals, including a sequentially connected single-resistor detection circuit, a filter amplifier circuit, troubleshooting and software filter modules, a three-phase to two-phase system conversion module, and rotor position Determination module, two-phase to three-phase conversion module, three-phase energization time fan module, intelligent power module, the single resistance detection circuit is connected to the neutral line on the intelligent power module, and the input of the intelligent power module is connected to the single-rotor compressor terminal connection; characterized in that, The estimation of the position of the compressor rotor by the rotor position judging module is optimized as the frequency changes, and the rotor position judging module includes The parameter input module introduces discrete voltage and current signals from the three-phase to two-phase system transformation module; The low-pass filter module performs filter processing on the signal output by the parameter input module; The current estimation module obtains the current estimation equation according to the two-phase current signal output by the low-pass filter module: $\left[\begin{array}{c}{i}_{\mathrm{\γ}}\left(\mathrm{no}\right)\\ i_{\mathrm{\δ}}\left(\mathrm{no}\right)\end{array}\right]=\left[\begin{array}{cc}1-\frac{R}{L_d}T& {\stackrel{\&Center\; Dot;}{\mathrm{\θ}}}_m\frac{L_q}{L_d}T\\ -{\stackrel{\·}{\mathrm{\θ}}}_m\frac{L_d}{L_q}T& 1-\frac{R}{L_q}T\end{array}\right]\left[\begin{array}{c}{i}_{\mathrm{\γ}}(\mathrm{no}-1)\\ i_{\mathrm{\δ}}(\mathrm{no}-1)\end{array}\right]-e_m\left[\begin{array}{c}0\\ 1/L_q\end{array}\right],$ Among them, i _γ (n) is the estimated current value of the γ-axis under the estimated coordinate system γ-δ, i _δ (n) is the estimated current value of the δ-axis under the estimated coordinate system γ-δ, and i _γ (n -1) is the current value of the γ-axis in the estimated coordinate system γ-δ, i _δ (n-1) is the current value of the δ-axis in the estimated coordinate system γ-δ, R is the motor resistance, and T is the sampling cycle,

is the current angular velocity of the rotor, e _M is the current rotational electromotive force, L _d is the inductance value of the d-axis under the moving coordinate system dq, and L _q is the inductance value of the q-axis under the moving coordinate system dq; The rotor position estimation module derives the rotor position angle estimation equation according to the current estimation equation in the current estimation module:

Among them, e _M (n) is the estimated rotational electromotive force, e _M (n-1) is the current rotational electromotive force, Δi _γ (n) is the estimated current change value of the γ axis in the estimated coordinate system γ-δ, Δi _δ (n) is the estimated current change value of the δ axis in the estimated coordinate system γ-δ, θ _M (n) is the estimated rotor position angle under the γ-δ coordinate axis, To estimate the current rotor angular velocity in the coordinate system γ-δ, K _e and K _M are adjustable parameters; The above estimated rotor position angle is obtained, so as to realize the estimation of the rotor position of the compressor in the next time period. 2. A variable frequency controller for household appliance single-rotor compressors based on electric signals according to claim 1, characterized in that the rotor position estimation module divides the full frequency range of motor rotation into multiple frequency segments, and in each In each frequency band, the adjustable parameters K _e and K _M have a corresponding set of values, so as to realize the parameter adjustment of the whole frequency band. 3. According to claim 1 or 2, a variable frequency controller for household appliances single-rotor compressors based on electric signals, characterized in that it also includes The upper computer or the system requires a frequency value setting module, through which the motor rotation frequency of the single-rotor compressor can be set according to requirements; And the maximum torque and power modules with frequency thresholds set inside, connected between the rotor position estimation module of the rotor position determination module and the two-phase to three-phase conversion module, and at the same time communicate with the upper computer or the system required frequency value setting module connect: When the upper computer or the system requires that the rotation frequency set by the frequency value setting module is lower than the frequency threshold, the maximum torque and power module outputs the maximum torque to control the motor of the single-rotor compressor; when the upper computer or the system requires the frequency value to be set When the rotation frequency set by the constant module is greater than the frequency threshold, the maximum torque and power module outputs the maximum frequency to control the motor of the single-rotor compressor. 4. The method for realizing the frequency conversion controller of the household appliance single-rotor compressor according to claim 1, characterized in that it comprises the following steps: (a) Detect the three-phase current of the single-rotor compressor: through the single-resistance detection circuit, according to the set single-phase voltage energization sequence and time interval, collect 3 times to obtain the U, V, W three-phase current of the single-rotor compressor motor; (b) Amplify the collected signal and judge abnormality: amplify the collected three-phase current through the filter amplifier circuit, and use the current sum formed after the three-phase source is symmetrical to be zero to determine whether the compressor exists through the troubleshooting and software filter module Abnormal situation of lack of phase; (c) Three-phase voltage to two-phase voltage conversion: the three-phase discrete voltage signal output by the troubleshooting and software filtering module is converted into a two-phase discrete voltage signal through the three-phase to two-phase system conversion module, and then assigned to the rotor position determination module , to estimate the rotor position of the compressor in the next time period; (d) Estimate compressor rotor position: introduce discrete voltage and current signals from the three-phase to two-phase system conversion module through the parameter input module in the rotor position determination module, and introduce the parameter input module through the low-pass filter module The signal is filtered, the current estimation equation is obtained by the current estimation module, and then the rotor position angle estimation equation is derived by the rotor position estimation module according to the current estimation equation, so as to realize the compression of the next time period Estimation of machine rotor position; (e) Control the rotor of the compressor to rotate: through the two-phase to three-phase conversion module, the two-phase current in the current estimation equation is changed into three-phase, through the three-phase energization time fan module and the intelligent power module according to the rotor position angle The estimated rotor position angle in the estimated equation is used to control the rotation of the motor of the single-rotor compressor. 5. The implementation method according to claim 4, wherein the rotor position estimation module divides the full frequency band of motor rotation into a plurality of frequency segments, and in each frequency band, the rotor position angle estimation equation The two adjustable parameters K _e and K _M in have a corresponding set of values to realize full-band parameter adjustment. 6. The implementation method according to claim 4, characterized in that, between step (d) and step (e), the control mode of step (f) is selected: by the upper computer or the system requirement frequency value setting module Set the motor rotation frequency of the single-rotor compressor according to the requirements, and then judge and process through the maximum torque and power module with the frequency threshold set inside, when the upper computer or the system requires the frequency value setting module to set the rotation frequency When the frequency threshold is reached, the maximum torque and power module outputs the maximum torque to control the motor of the single-rotor compressor; when the upper computer or the system requires the frequency value setting module to set a rotation frequency greater than the frequency threshold, the maximum torque and power The module outputs the maximum frequency to control the motor of the single rotor compressor.

Images