CN112583319A - Phase voltage detection method and device of motor, electric appliance and readable storage medium - Google Patents

Phase voltage detection method and device of motor, electric appliance and readable storage medium Download PDF

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Publication number
CN112583319A
CN112583319A CN202011394905.3A CN202011394905A CN112583319A CN 112583319 A CN112583319 A CN 112583319A CN 202011394905 A CN202011394905 A CN 202011394905A CN 112583319 A CN112583319 A CN 112583319A
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phase
motor
value
voltage
phase voltage
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CN112583319B (en
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李荷洁
程云峰
柳鹏
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Midea Welling Motor Technology Shanghai Co Ltd
Welling Wuhu Motor Manufacturing Co Ltd
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Midea Welling Motor Technology Shanghai Co Ltd
Welling Wuhu Motor Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage

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  • Control Of Ac Motors In General (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention provides a phase voltage detection method and device of a motor, an electric appliance and a readable storage medium. Wherein, the looks voltage detection method of motor, the three-phase terminal of motor all is connected with sampling filter circuit, includes: determining actual phase voltage values of the three-phase terminals; determining a filter coefficient of a sampling filter circuit; and determining the compensated phase voltage value of the three-phase terminal according to the actual phase voltage value and the filter coefficient. The invention provides a phase voltage detection method of a motor, which can accurately acquire the phase voltage of the motor, is simpler to measure the phase voltage, does not need to arrange a complex voltage acquisition circuit in the motor, and improves the accuracy of acquiring the phase voltage on the premise of not increasing the additional production cost of the motor.

Description

Phase voltage detection method and device of motor, electric appliance and readable storage medium
Technical Field
The invention belongs to the technical field of motor voltage detection and control, and particularly relates to a phase voltage detection method of a motor, a phase voltage detection device of the motor, an electric appliance and a readable storage medium.
Background
In the sensorless control process based on the vector control, it is necessary to grasp accurate flux linkage information, and therefore flux linkage estimation is necessary. In the stator flux linkage estimation based on the voltage model, the related input signals comprise motor phase voltage and phase current, a general control system only detects the phase current and does not detect the phase voltage, so that the stator flux linkage estimation is carried out by replacing the actual phase voltage with a command voltage, the precision of flux linkage estimation is influenced, and particularly, when the motor runs at low speed. Therefore, a phase voltage detection method which is simple in measurement and easy to implement is necessary.
Disclosure of Invention
The present invention is directed to solving one of the technical problems of the prior art or the related art.
To this end, a first aspect of the present invention proposes a phase voltage detection method of an electric machine.
A second aspect of the present invention provides a phase voltage detection device of an electric motor.
A third aspect of the invention proposes an electrical appliance.
A fourth aspect of the invention proposes a readable storage medium.
In view of the above, according to a first aspect of the present invention, a method for detecting phase voltages of a motor is provided, where sampling filter circuits are connected to three-phase terminals of the motor, the method including: acquiring actual phase voltage values of three-phase terminals; acquiring a filter coefficient of a sampling filter circuit; and obtaining the compensated phase voltage value of the three-phase terminal according to the actual phase voltage value and the filter coefficient.
The invention provides a phase voltage detection method of a motor, which is used for detecting phase voltages of three-phase stator windings in a three-phase motor. The three-phase terminals of the motor are provided with sampling filter circuits, and the sampling filter circuits can collect phase voltages on corresponding stator windings in the three-phase stator windings of the three-phase motor. The three-phase terminals of the motor are connected with the three-phase inverter, the three-phase inverter supplies power to the three stator windings of the motor through the three-phase terminals of the motor, the sampling filter circuit is arranged on the three-phase terminals between the three-phase inverter and the stator windings, and phase voltage on the three-phase terminals of the motor can be accurately collected.
The phase voltage detection method of the motor needs to acquire voltage values of three-phase terminal positions of the motor through a sampling filter circuit, actual phase voltage values of the three-phase terminals are obtained through calculation according to the acquired voltage values, the actual phase voltage values of the three-phase terminals specifically include three voltage values, and the three voltage values correspond to phase voltages of three different stator windings in the motor. The sampling circuit comprises a resistive element and a capacitive element, namely a resistor and a capacitor, wherein filtering is performed through the capacitor, so that the accuracy of the acquired voltage value is improved, the influence of other interference information on the acquired voltage result is avoided, and the filtering parameters of the sampling filter circuit are determined under the current state according to the self attribute parameters of each part in the sampling circuit and the working condition of the sampling circuit. And calculating according to the obtained filter coefficient and the actual phase voltage value of the three-phase motor so as to compensate the actual phase voltage value, and compensating after voltage amplitude attenuation and voltage phase caused by filtering of the sampling filter circuit. Therefore, the phase voltage of the motor can be accurately obtained through the method, the measurement of the phase voltage is simpler, a complex voltage acquisition circuit is not required to be arranged in the motor, and the accuracy of obtaining the phase voltage is improved on the premise of not increasing the extra production cost of the motor.
It can be understood that three groups of stator windings of the motor are connected with a three-phase power supply, so that the collected terminal voltages can be directly used as phase voltages of the motor by collecting the terminal voltages on three-phase terminals. Therefore, the voltage sampling module is arranged to collect the voltage on the three-phase terminal of the motor. The voltage sampling module comprises three sampling filter circuits, each sampling filter circuit is connected to different terminals, the voltages on the different terminals are collected, and the collected voltages are calculated to obtain phase voltages.
In addition, according to the phase voltage detection method of the motor in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in one possible design, a sampling filter circuit includes: the method includes the steps of obtaining a filter coefficient of a sampling filter circuit, and specifically includes: acquiring a first resistance value of the first resistive element, a second resistance value of the second resistive element and a capacitance value of the capacitive element; acquiring the actual rotating speed of the motor; and calculating a filter coefficient of the sampling filter circuit according to the first resistance value, the second resistance value, the capacitance value and the actual rotating speed value.
In this design, the sampling filter circuit includes two resistive elements and one capacitive element. The resistive elements are all selected as resistors, the capacitive elements are selected as capacitors, the following resistive elements and capacitive elements are represented by resistors and capacitors, specifically, the first resistive element is represented by a first resistor, the second resistive element is represented by a second resistor, and the capacitive elements are represented by capacitors.
The first end of a first resistor in the sampling filter circuit is directly connected to one of the three-phase terminals, the second end of the first resistor is connected to the first end of a second resistor, the first end of a capacitor is connected to the first end of the second resistor, and the second end of the capacitor is connected to the second end of the second resistor. The first resistor and the second resistor are connected in series, and then the capacitor is connected with the second resistor in parallel. The first resistor, the second resistor and the capacitor divide voltage at one of the three-phase terminals connected with the first resistor, the second resistor and the capacitor, the first end position of the capacitor is used as an output end of a detection signal, namely the detected voltage signal is output through the first end of the capacitor, and a processor of the motor receives the voltage signal and calculates and processes the voltage signal to obtain corresponding phase voltage.
The filter coefficient of the sampling filter circuit is obtained by calculation, and the method specifically comprises the following steps: and acquiring a first resistance value of the first resistor, a second resistance value of the second resistor and a capacitance value of the capacitor, wherein the first resistance value, the second resistance value and the capacitance value can be directly obtained by type selection of the first resistor, the second resistor and the capacitor. The method comprises the steps of collecting the real-time rotating speed of a motor in a running state, wherein the voltage value of a three-phase terminal of the motor is in relation with the rotating speed of the motor, specifically, the voltage value is larger when the rotating speed of the motor is larger, and therefore a filter coefficient is a variable related to the real-time rotating speed of the motor. The filter coefficient of the sampling circuit can be obtained by calculating the first resistance value, the second resistance value, the capacitance value and the real-time rotating speed of the motor, and the accuracy of the actual phase voltage can be further improved by performing compensation calculation on the actual phase voltage through the filter coefficient.
In some embodiments, the filter coefficients are calculated by the following formula:
Figure BDA0002814433490000031
wherein, KfIs a filter coefficient, R1Is a first resistance value, R2Is the second resistance value, C is the capacitance value, and n is the actual rotation speed of the motor.
In these embodiments, the filter coefficients can be calculated by the above formula. The obtained filter coefficient is related to the first resistance value, the second resistance value, the capacitance value and the actual rotating speed of the motor in the sampling filter circuit, and the accuracy of the actual phase voltage can be improved by performing compensation calculation on the actual phase voltage through the filter coefficient.
In one possible design, the step of calculating the compensated phase voltage values of the three-phase terminals according to the actual phase voltage values and the filter coefficients specifically includes: carrying out conversion operation on the actual phase voltage value to obtain a two-phase voltage actual value under a static coordinate; calculating a compensated two-phase voltage value according to the filter coefficient and the two-phase voltage actual value; and performing conversion operation on the compensated two-phase voltage values to obtain compensated phase voltage values of the three-phase terminal.
In this design, the process of calculating the compensated phase voltage from the filter coefficient and the actual phase voltage is as follows: the obtained actual phase voltage values of the three-phase terminals are subjected to Clark conversion (Clark conversion) to calculate two-phase voltage actual values under a static coordinate system, and the calculated two-phase voltage values under the static coordinate system correspond to the actual phase voltage values of the three-phase terminals, so that the two-phase voltage actual values are two-phase voltage actual values which are not subjected to compensation calculation. The two-phase voltage value after compensation is obtained by performing compensation calculation on the two-phase voltage actual value which is not subjected to compensation calculation and the filter coefficient, and the two-phase voltage value after compensation is more accurate than the two-phase voltage actual value which is not subjected to compensation calculation. The compensated two-phase voltages are again subjected to Clark transformation (Clark transformation) to obtain three-phase terminal compensated phase voltage values. By converting the actual phase voltage of the three-phase terminal into the two-phase voltage value under the static coordinate system, the actual value of the two-phase voltage can be compensated and calculated through the filter coefficient, and then the voltage after compensation calculation is converted into the compensated phase voltage. Through setting a corresponding conversion calculation process, the phase voltage of the motor can be accurately acquired without adding hardware.
In some embodiments, the three-phase terminal actual phase voltage values can be converted into two-phase voltage actual values in a stationary coordinate system by the following formula:
Figure BDA0002814433490000041
wherein the content of the first and second substances,
Figure BDA0002814433490000042
is the actual value of the two-phase voltage,
Figure BDA0002814433490000043
is the actual phase voltage value of the three-phase terminal.
In some embodiments, the compensated two-phase voltage value can be determined from the two-phase voltage actual value and the filter coefficient by the following formula:
Figure BDA0002814433490000051
wherein, VαIs the actual voltage value of the first phase of the two-phase voltage actual values, VβIs the actual voltage value of the second phase of the two-phase voltage actual values, VαcompFor the voltage value of the first phase of the compensated two-phase voltage values, VβcompFor the voltage value of the second phase of the compensated two-phase voltage values, KfAre filter coefficients.
In some embodiments, the compensated two-phase voltage values can be converted to compensated phase voltage values for the three-phase terminals by the following formula:
Figure BDA0002814433490000052
wherein, VαcompFor the voltage value of the first phase of the compensated two-phase voltage values, VβcompFor the voltage value of the second phase of the compensated two-phase voltage values, VanCompensated phase voltage value, V, for the first phase of the three-phase terminalsbnCompensated phase voltage value, V, for the second phase of the three-phase terminalscnThe compensated phase voltage value for the third phase of the three-phase terminals.
In one possible design, the first resistance value, the second resistance value, and the capacitance value of the capacitive element satisfy the following relationship:
Figure BDA0002814433490000053
wherein f is the frequency of the PWM signal, R1 is a first resistance, R2 is a second resistance, and C is a capacitance.
In the design, when the sampling filter circuit is configured, the first resistive element, the second resistive element and the capacitive element need to be reasonably selected. When the first resistive element, the second resistive element, and the capacitive element are type-selected, the relationship between the first resistance value, the second resistance value, and the capacitance value and the PWM frequency (frequency of the pulse width modulation signal) of the motor needs to be considered. Therefore, the first resistance value, the second resistance value and the capacitance value are configured to meet the relation, so that the error of the sampling filter circuit for collecting the voltage value can be effectively reduced, and the influence on the accuracy of the finally obtained compensated phase voltage value is avoided.
In one possible design, the first resistance value and the second resistance value satisfy the following relationship:
Figure BDA0002814433490000061
wherein R is1Is a first resistance value, R2Is a second resistance value, VmaxIs the maximum voltage value of the motor, VdThe supply voltage of the filter circuit is sampled.
In the design, a numerical relation exists between the ratio of the maximum voltage value of the motor to the supply voltage of the sampling filter circuit and the resistance value ratio of the first resistive element and the second resistive element. The maximum voltage value of the motor can be determined according to the power supply voltage of the sampling filter circuit through the numerical value relationship, or the power supply voltage of the sampling filter circuit can be determined according to the maximum voltage value of the motor.
In one possible design, the step of calculating actual phase voltage values of three-phase terminals of the motor specifically includes: acquiring a sampling voltage value of a three-phase terminal of a motor; calculating a partial pressure coefficient; and calculating an actual phase voltage value according to the sampling voltage value and the voltage division coefficient of the three-phase terminal.
In this design, the actual phase voltage value can be obtained by calculation from the voltage division coefficient and the sampled voltage value of the three-phase terminal. Therefore, the voltage division coefficient, the sampling voltage value of the three-phase terminal and the sampling voltage value need to be obtained, so that the sampling voltage value of the three-phase terminal is collected through the sampling filter circuit before calculation, and the voltage division coefficient is determined. And calculating the voltage division coefficient and the sampling voltage value of the three-phase terminal to obtain an actual phase voltage value.
In some embodiments, the actual phase voltage value of the three-phase terminal can be calculated according to the voltage division coefficient and the sampled voltage value of the three-phase terminal by a formula, which is as follows:
Figure BDA0002814433490000062
wherein K is a partial pressure coefficient, VaIs the actual phase voltage value, V, of the first phase of the three-phase terminalsbActual phase voltage value, V, of a second phase of the three-phase terminalcIs the actual phase voltage value, V, of the third phase of the three-phase terminalsADC_aIs a sampled voltage value, V, of a first phase in a three-phase terminalADC_bSampled voltage value, V, of a second phase in a three-phase terminalADC_cIs a sampled voltage value of a third phase in the three-phase terminal.
In these examples, VADC_a、VADC_b、VADC_cThe three groups of stator windings of the motor are connected with a three-phase power supply, so that the terminal voltage on the three-phase terminal is acquired, and the acquired terminal voltage can be directly used as the phase voltage of the motor. The sampling voltage value can be directly obtained through the sampling filter circuit.
In a possible design, the step of obtaining sampled voltage values of three-phase terminals of the motor specifically includes: and detecting the sampling voltage value of the three-phase terminal of the motor through a sampling filter circuit.
In the design, the sampling voltage value of the three-phase terminal is the terminal voltage of the three-phase terminal of the motor, and the terminal voltage of the three-phase terminal of the motor can be directly acquired through the sampling filter circuit.
In one possible design, the step of calculating the voltage division coefficient specifically includes: and calculating a voltage division coefficient according to the first resistance value and the second resistance value.
In this design, it is possible to select not to perform the correction process when calculating the actual phase voltage values of the three-phase terminals. At this time, when the voltage division coefficient is calculated, errors between a first resistance value calibrated by the first resistive element, a second resistance value calibrated by the second resistive element and a capacitance value calibrated by the capacitive element and an actual value do not need to be considered, so that the voltage division coefficient can be directly calculated according to the first resistance value, the second resistance value and the capacitance value.
In some embodiments, the voltage division coefficient can be calculated according to the first resistance value and the second resistance value by the following formula:
Figure BDA0002814433490000071
wherein K is a partial pressure coefficient, R1Is a first resistance value, R2Is the second resistance value.
In these embodiments, the voltage division coefficient is calculated from the first resistance value and the second resistance value.
In one possible design, the step of calculating the voltage division coefficient specifically includes: calculating the average value of the three-phase voltage of the motor; acquiring a period value, a duty ratio and signal response time of a pulse width modulation signal of the motor and a bus voltage value of the motor; and calculating a voltage division coefficient according to the bus voltage value, the periodic value of the motor, the duty ratio, the signal response time and the three-phase voltage average value.
In this design, the correction process may be selected to be performed when calculating the actual phase voltage values of the three-phase terminals. At this time, when calculating the voltage division coefficient, the error between the first resistance value calibrated by the first resistive element, the second resistance value calibrated by the second resistive element, and the capacitance value calibrated by the capacitive element and the actual value needs to be considered. Therefore, the period value of the PWM (pulse width modulation) of the motor, the corresponding time and duty ratio of the signal, and the bus voltage value of the motor need to be obtained. The method comprises the steps of obtaining a period value of PWM (pulse width modulation signal), corresponding time and duty ratio of the signal and a bus voltage value of a motor, calculating the period value, the corresponding time and the duty ratio according to a formula to obtain a voltage division ratio, and calculating an actual phase voltage value of a three-phase terminal according to a voltage division coefficient obtained through the calculation mode and a three-phase voltage average value to avoid the influence of errors of a resistance value and a capacitance value on a calculation result. The effect of calibrating the actual phase voltage values of the three-phase terminals is achieved.
It can be understood that the voltage division ratio can be obtained through the period value of the PWM (pulse width modulation) of the motor, the corresponding time of the signal and the duty ratio, and the voltage division coefficient can be calculated according to the obtained voltage division ratio, and the bus voltage value and the three-phase voltage average value of the motor.
Wherein, the corresponding time of the signal is the dead time of the pulse width modulation signal.
In some embodiments, the voltage division coefficient can be calculated by a formula through a three-phase voltage average value, a bus voltage value, a duty ratio of a pulse width modulation signal, a period value and a signal response time, and the specific formula is as follows:
Figure BDA0002814433490000081
Figure BDA0002814433490000082
wherein k isaIs the voltage division ratio, k, of the sampling filter circuit connected to the first phase of the three-phase terminalsbIs the voltage division ratio, k, of the sampling filter circuit connected to the second phase of the three-phase terminalscIs the voltage division ratio of the sampling filter circuit connected with the third phase of the three-phase terminal, eta is the duty ratio of the pulse width modulation signal of the motor, TwmIs the value of the period, T, of the pulse width modulated signaldFor signal response time, VdcIs the bus voltage, VADC a0Is the average value of the voltage of the first phase, V, in the three-phase terminalsADC_b0Is the average value of the voltage of the second phase, V, in the three-phase terminalsADC_C0Is the average value of the voltage of the third phase in the three-phase terminals.
In these embodiments, the voltage division coefficients on different phases are calculated by sampling filter circuits connected to the different phases in the three-phase terminals, respectively. And calculating according to the different voltage division coefficients and the average voltage values of different phases in the three-phase terminal to obtain the actual phase voltage value. The actual phase voltage value is the actual phase voltage value after calibration, so that the influence of a resistance value and a capacitance value in the sampling filter circuit is eliminated, and the accuracy of the obtained compensated phase voltage value is further improved.
In a possible design, the step of calculating the average value of the three-phase voltages of the motor specifically includes: acquiring a set time length, and acquiring three-phase voltage values in the set time length through a sampling filter circuit; and calculating the three-phase voltage average value of the motor according to the set time length and the three-phase voltage value in the set time length.
In the design, the average value of the three-phase voltage values of the motor is calculated, and the average value of the three-phase voltage values in the set time length can be obtained by dividing the three-phase voltage values in the set time length by the set time length.
Wherein the set duration is related to a period value of the PWM signal.
In one possible design, the step of obtaining actual phase voltage values of three-phase terminals of the motor is preceded by the step of: and controlling the motor to start running.
In the design, the voltage values of the three-phase terminals of the motor are related to the working state of the motor, and when the motor is in a stop operation state, the three-phase terminals of the motor do not have corresponding voltages, so that the motor is controlled to be in an operation state, and then the voltage values of the motor are calculated and collected.
According to a second aspect of the present invention, there is provided a phase voltage detection device of a motor, comprising: a memory having a program or instructions stored therein; a processor executing a program or instructions stored in a memory to implement the phase voltage detection method of the motor as in the first aspect described above.
The processor in the phase voltage detection device provided by the invention can execute the instructions or programs on the memory, so that the phase voltage detection method of the motor in any possible design is limited, and therefore, the phase voltage detection device has all the beneficial effects of the phase voltage detection method in any possible design, and redundant description is not repeated.
According to a third aspect of the invention, there is provided an appliance comprising: a motor; as the phase voltage detection device of the motor in the second aspect described above, the phase voltage detection device is connected to the motor.
The electric appliance provided by the invention comprises a motor and a voltage detection device connected with the motor, wherein the voltage detection device can execute a voltage detection method so as to detect phase voltage of the motor in an operating state.
The three-phase terminals of the motor are provided with sampling filter circuits, and the sampling filter circuits can collect phase voltages on corresponding stator windings in the three-phase stator windings of the three-phase motor. The three-phase terminals of the motor are connected with the three-phase inverter, the three-phase inverter supplies power to the three stator windings of the motor through the three-phase terminals of the motor, the sampling filter circuit is arranged on the three-phase terminals between the three-phase inverter and the stator windings, and phase voltage on the three-phase terminals of the motor can be accurately collected.
The phase voltage detection method of the motor needs to acquire voltage values of three-phase terminal positions of the motor through a sampling filter circuit, actual phase voltage values of the three-phase terminals are obtained through calculation according to the acquired voltage values, the actual phase voltage values of the three-phase terminals specifically include three voltage values, and the three voltage values correspond to phase voltages of three different stator windings in the motor. The sampling circuit comprises a resistive element and a capacitive element, namely a resistor and a capacitor, wherein filtering is performed through the capacitor, so that the accuracy of the acquired voltage value is improved, the influence of other interference information on the acquired voltage result is avoided, and the filtering parameters of the sampling filter circuit are determined under the current state according to the self attribute parameters of each part in the sampling circuit and the working condition of the sampling circuit. And calculating according to the obtained filter coefficient and the actual phase voltage value of the three-phase motor so as to compensate the actual phase voltage value, and compensating after voltage amplitude attenuation and voltage phase caused by filtering of the sampling filter circuit. Therefore, the phase voltage of the motor can be accurately obtained through the method, the measurement of the phase voltage is simpler, a complex voltage acquisition circuit is not required to be arranged in the motor, and the accuracy of obtaining the phase voltage is improved on the premise of not increasing the extra production cost of the motor.
It can be understood that three groups of stator windings of the motor are connected with a three-phase power supply, so that the collected terminal voltages can be directly used as phase voltages of the motor by collecting the terminal voltages on three-phase terminals. Therefore, the voltage sampling module is arranged to collect the voltage on the three-phase terminal of the motor. The voltage sampling module comprises three sampling filter circuits, each sampling filter circuit is connected to different terminals, the voltages on the different terminals are collected, and the collected voltages are calculated to obtain phase voltages.
In addition, according to the phase voltage detection method of the motor in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in one possible design, the appliance includes a fan, an air conditioner, a washing machine.
It is understood that the electric appliances include a blower, an air conditioner, and a washing machine. Of course, other electric devices provided with motors may be used, and the electric devices are not limited to the above three types.
According to a fourth aspect of the present invention, a readable storage medium is proposed, on which a program or instructions are stored, which when executed by a processor implement the steps of the phase voltage detection method of an electric machine as in any one of the possible designs described above. Therefore, the method has all the beneficial technical effects of any possible design of the phase voltage detection method of the motor, and redundant description is not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating a phase voltage detection method of a motor in a first embodiment of the present invention;
FIG. 2 shows a circuit diagram of a sampling filter circuit in one embodiment of the invention;
fig. 3 shows one of the flow charts of a phase voltage detection method of a motor in a second embodiment of the present invention;
fig. 4 shows a second flow chart of a phase voltage detection method of the motor in the second embodiment of the present invention;
fig. 5 shows a third flow chart of a phase voltage detection method of the motor in the second embodiment of the present invention;
fig. 6 shows one of the flow charts of the phase voltage detection method of the motor in the third embodiment of the invention;
fig. 7 shows a second flow chart of a phase voltage detection method of the motor in the third embodiment of the present invention;
fig. 8 shows a third flow chart of a phase voltage detection method of the motor in the third embodiment of the present invention;
fig. 9 shows a schematic block diagram of a phase voltage detection device of a motor in a fourth embodiment of the present invention;
fig. 10 shows a schematic block diagram of an electric appliance in a fifth embodiment of the present invention;
fig. 11 shows a schematic block diagram of a phase voltage detection device of a motor in a sixth embodiment of the present invention.
Wherein, the corresponding relationship between the reference numbers and the names of the components in fig. 2 is:
a 200 sample filter circuit, 202 a first resistive element, 204 a second resistive element, 206 a capacitive element.
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 invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
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 therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A phase voltage detection method of a motor, a phase voltage detection apparatus of a motor, an electric appliance and a readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 11.
The first embodiment is as follows:
as shown in fig. 1, a first embodiment of the present invention provides a phase voltage detection method for a motor, where the phase voltage detection method is used for a motor, and a sampling filter circuit is connected to three-phase terminals of the motor, and the method includes:
102, acquiring actual phase voltage values of three-phase terminals of a motor;
104, acquiring a filter coefficient of a sampling filter circuit connected with a three-phase terminal;
and step 106, obtaining a compensated phase voltage value through the filter coefficient and the actual phase voltage value.
In the embodiment, the phase voltage detection method of the motor is used for detecting the phase voltages of three-phase stator windings in a three-phase motor. The three-phase terminals of the motor are provided with sampling filter circuits, and the sampling filter circuits can collect phase voltages on corresponding stator windings in the three-phase stator windings of the three-phase motor. The three-phase terminals of the motor are connected with the three-phase inverter, the three-phase inverter supplies power to the three stator windings of the motor through the three-phase terminals of the motor, the sampling filter circuit is arranged on the three-phase terminals between the three-phase inverter and the stator windings, and phase voltage on the three-phase terminals of the motor can be accurately collected.
The phase voltage detection method of the motor needs to acquire voltage values of three-phase terminal positions of the motor through a sampling filter circuit, actual phase voltage values of the three-phase terminals are obtained through calculation according to the acquired voltage values, the actual phase voltage values of the three-phase terminals specifically include three voltage values, and the three voltage values correspond to phase voltages of three different stator windings in the motor. The sampling circuit comprises a resistive element and a capacitive element, namely a resistor and a capacitor, wherein filtering is performed through the capacitor, so that the accuracy of the acquired voltage value is improved, the influence of other interference information on the acquired voltage result is avoided, and the filtering parameters of the sampling filter circuit are determined under the current state according to the self attribute parameters of each part in the sampling circuit and the working condition of the sampling circuit. And calculating according to the obtained filter coefficient and the actual phase voltage value of the three-phase motor so as to compensate the actual phase voltage value, and compensating after voltage amplitude attenuation and voltage phase caused by filtering of the sampling filter circuit. Therefore, the phase voltage of the motor can be accurately obtained through the method, the measurement of the phase voltage is simpler, a complex voltage acquisition circuit is not required to be arranged in the motor, and the accuracy of obtaining the phase voltage is improved on the premise of not increasing the extra production cost of the motor.
It can be understood that three groups of stator windings of the motor are connected with a three-phase power supply, so that the collected terminal voltages can be directly used as phase voltages of the motor by collecting the terminal voltages on three-phase terminals. Therefore, the voltage sampling module is arranged to collect the voltage on the three-phase terminal of the motor. The voltage sampling module comprises three sampling filter circuits, each sampling filter circuit is connected to different terminals, the voltages on the different terminals are collected, and the collected voltages are calculated to obtain phase voltages.
As shown in fig. 2, the sampling filter circuit 200 includes: a first resistive element 202, a second resistive element 204, and a capacitive element 206, a first end of the first resistive element 202 being connected to a three-phase terminal;
the sampling filter circuit includes two resistive elements and a capacitive element. The resistive elements are all selected as resistors, the capacitive elements are selected as capacitors, the following resistive elements and capacitive elements are represented by resistors and capacitors, specifically, the first resistive element is represented by a first resistor, the second resistive element is represented by a second resistor, and the capacitive elements are represented by capacitors.
The second end of the first resistor is connected with the first end of the second resistor, the first end of the capacitor is connected with the first end of the second resistor, and the second end of the capacitor is connected with the second end of the second resistor.
The first end of a first resistor in the sampling filter circuit is directly connected to one of the three-phase terminals, the second end of the first resistor is connected to the first end of a second resistor, the first end of a capacitor is connected to the first end of the second resistor, and the second end of the capacitor is connected to the second end of the second resistor. The first resistor and the second resistor are connected in series, and then the capacitor is connected with the second resistor in parallel. The first resistor, the second resistor and the capacitor divide voltage at one of the three-phase terminals connected with the first resistor, the second resistor and the capacitor, the first end position of the capacitor is used as an output end of a detection signal, namely the detected voltage signal is output through the first end of the capacitor, and a processor of the motor receives the voltage signal and calculates and processes the voltage signal to obtain corresponding phase voltage.
Example two:
as shown in fig. 3, a second embodiment of the present invention provides a phase voltage detection method for a motor, where the phase voltage detection method is used for a motor, and three-phase terminals of the motor are connected to sampling filter circuits, including:
step 302, acquiring actual phase voltage values of three-phase terminals of the motor;
step 304, acquiring a first resistance value of the first resistor, a second resistance value of the second resistor and a capacitance value of the capacitor;
step 306, collecting the actual rotating speed of the motor;
step 308, calculating the actual rotation speed value, the first resistance value, the second resistance value and the capacitance value to obtain a filter coefficient;
and 310, calculating through the filter coefficient and the actual phase voltage value to obtain a compensated phase voltage value.
In this embodiment, a first end of a first resistor in the sampling filter circuit is directly connected to one of the three-phase terminals, a second end of the first resistor is connected to a first end of a second resistor, a first end of a capacitor is connected to a first end of the second resistor, and a second end of the capacitor is connected to a second end of the second resistor. The first resistor and the second resistor are connected in series, and then the capacitor is connected with the second resistor in parallel. The first resistor, the second resistor and the capacitor divide voltage at one of the three-phase terminals connected with the first resistor, the second resistor and the capacitor, the first end position of the capacitor is used as an output end of a detection signal, namely the detected voltage signal is output through the first end of the capacitor, and a processor of the motor receives the voltage signal and calculates and processes the voltage signal to obtain corresponding phase voltage.
The filter coefficient of the sampling filter circuit is obtained by calculation, and the method specifically comprises the following steps: and acquiring a first resistance value of the first resistor, a second resistance value of the second resistor and a capacitance value of the capacitor, wherein the first resistance value, the second resistance value and the capacitance value can be directly obtained by type selection of the first resistor, the second resistor and the capacitor. The method comprises the steps of collecting the real-time rotating speed of a motor in a running state, wherein the voltage value of a three-phase terminal of the motor is in relation with the rotating speed of the motor, specifically, the voltage value is larger when the rotating speed of the motor is larger, and therefore a filter coefficient is a variable related to the real-time rotating speed of the motor. The filter coefficient of the sampling circuit can be obtained by calculating the first resistance value, the second resistance value, the capacitance value and the real-time rotating speed of the motor, and the accuracy of the actual phase voltage can be further improved by performing compensation calculation on the actual phase voltage through the filter coefficient.
In some embodiments, the filter coefficients are calculated by the following formula:
Figure BDA0002814433490000141
wherein, KfIs a filter coefficient, R1Is a first resistance value, R2Is the second resistance value, C is the capacitance value, and n is the actual rotation speed of the motor.
In these embodiments, the filter coefficients can be calculated by the above formula. The obtained filter coefficient is related to the first resistance value, the second resistance value, the capacitance value and the actual rotating speed of the motor in the sampling filter circuit, and the accuracy of the actual phase voltage can be improved by performing compensation calculation on the actual phase voltage through the filter coefficient.
As shown in fig. 4, the step of calculating the actual phase voltage value through the filter coefficient to obtain the compensated phase voltage value specifically includes:
step 402, converting and operating an actual phase voltage value to obtain a two-phase voltage actual value under a static coordinate;
step 404, calculating through the actual value of the two-phase voltage and the filter coefficient to obtain a compensated two-phase voltage value;
and 406, converting and operating the compensated two-phase voltage values to obtain the compensated phase voltage values of the three-phase terminals.
In this embodiment, the process of calculating the compensated phase voltages from the filter coefficients and the actual phase voltages is as follows: the obtained actual phase voltage values of the three-phase terminals are subjected to Clark conversion (Clark conversion) to calculate two-phase voltage actual values under a static coordinate system, and the calculated two-phase voltage values under the static coordinate system correspond to the actual phase voltage values of the three-phase terminals, so that the two-phase voltage actual values are two-phase voltage actual values which are not subjected to compensation calculation. The two-phase voltage value after compensation is obtained by performing compensation calculation on the two-phase voltage actual value which is not subjected to compensation calculation and the filter coefficient, and the two-phase voltage value after compensation is more accurate than the two-phase voltage actual value which is not subjected to compensation calculation. The compensated two-phase voltages are again subjected to Clark transformation (Clark transformation) to obtain three-phase terminal compensated phase voltage values. By converting the actual phase voltage of the three-phase terminal into the two-phase voltage value under the static coordinate system, the actual value of the two-phase voltage can be compensated and calculated through the filter coefficient, and then the voltage after compensation calculation is converted into the compensated phase voltage. Through setting a corresponding conversion calculation process, the phase voltage of the motor can be accurately acquired without adding hardware.
In some embodiments, the three-phase terminal actual phase voltage values can be converted into two-phase voltage actual values in a stationary coordinate system by the following formula:
Figure BDA0002814433490000151
wherein the content of the first and second substances,
Figure BDA0002814433490000152
is the actual value of the two-phase voltage,
Figure BDA0002814433490000153
is the actual phase voltage value of the three-phase terminal.
In some embodiments, the compensated two-phase voltage value can be determined from the two-phase voltage actual value and the filter coefficient by the following formula:
Figure BDA0002814433490000154
wherein, VαIs the actual voltage value of the first phase of the two-phase voltage actual values, VβIs the actual voltage value of the second phase of the two-phase voltage actual values, VαcompFor the voltage value of the first phase of the compensated two-phase voltage values, VβcompFor the voltage value of the second phase of the compensated two-phase voltage values, KfAre filter coefficients.
In some embodiments, the compensated two-phase voltage values can be converted to compensated phase voltage values for the three-phase terminals by the following formula:
Figure BDA0002814433490000161
wherein, VαcompFor the voltage value of the first phase of the compensated two-phase voltage values, VβcompFor the voltage value of the second phase of the compensated two-phase voltage values, VanCompensated phase voltage value, V, for the first phase of the three-phase terminalsbnCompensated phase voltage value, V, for the second phase of the three-phase terminalscnThe compensated phase voltage value for the third phase of the three-phase terminals.
In some embodiments, the first resistance value, the second resistance value, and the capacitance value of the capacitive element satisfy the following relationship:
Figure BDA0002814433490000162
wherein f is the frequency of the PWM signal, R1 is a first resistance, R2 is a second resistance, and C is a capacitance.
In these embodiments, the first resistive element, the second resistive element, and the capacitive element need to be appropriately shaped when configuring the sampling filter circuit. When the first resistive element, the second resistive element, and the capacitive element are type-selected, the relationship between the first resistance value, the second resistance value, and the capacitance value and the PWM frequency (frequency of the pulse width modulation signal) of the motor needs to be considered. Therefore, the first resistance value, the second resistance value and the capacitance value are configured to meet the relation, so that the error of the sampling filter circuit for collecting the voltage value can be effectively reduced, and the influence on the accuracy of the finally obtained compensated phase voltage value is avoided.
In some embodiments, the first resistance value and the second resistance value satisfy the following relationship:
Figure BDA0002814433490000163
wherein R is1Is a first resistance value, R2Is a second resistance value, VmaxIs the maximum voltage value of the motor, VdThe supply voltage of the filter circuit is sampled.
In the design, a numerical relation exists between the ratio of the maximum voltage value of the motor to the supply voltage of the sampling filter circuit and the resistance value ratio of the first resistive element and the second resistive element. The maximum voltage value of the motor can be determined according to the power supply voltage of the sampling filter circuit through the numerical value relationship, or the power supply voltage of the sampling filter circuit can be determined according to the maximum voltage value of the motor.
As shown in fig. 5, in some embodiments, the step of determining the actual phase voltage values of the three-phase terminals of the motor specifically includes:
step 502, acquiring a sampling voltage value of a three-phase terminal of a motor;
step 504, calculating a partial pressure coefficient through a formula;
step 506, calculating an actual phase voltage value through the voltage division coefficient and the sampling voltage value of the three-phase terminal.
In these embodiments, the actual phase voltage values can be obtained by calculation based on the voltage division coefficients and the sampled voltage values of the three-phase terminals. Therefore, the voltage division coefficient, the sampling voltage value of the three-phase terminal and the sampling voltage value need to be obtained, so that the sampling voltage value of the three-phase terminal is collected through the sampling filter circuit before calculation, and the voltage division coefficient is determined. And calculating the voltage division coefficient and the sampling voltage value of the three-phase terminal to obtain an actual phase voltage value.
In some embodiments, the actual phase voltage value of the three-phase terminal can be calculated according to the voltage division coefficient and the sampled voltage value of the three-phase terminal by a formula, which is as follows:
Figure BDA0002814433490000171
wherein K is a partial pressure coefficient, VaIs the actual phase voltage value, V, of the first phase of the three-phase terminalsbActual phase voltage value, V, of a second phase of the three-phase terminalcIs the actual phase voltage value, V, of the third phase of the three-phase terminalsADC_aIs a sampled voltage value, V, of a first phase in a three-phase terminalADC_bSampled voltage value, V, of a second phase in a three-phase terminalADC_cIs a sampled voltage value of a third phase in the three-phase terminal.
In these examples, VADC_a、VADC_b、VADC_cThe sampling voltage value of the three-phase terminal can be acquired by the sampling filter circuit, the terminal voltage of the three-phase terminal is acquired by the sampling filter circuit, and the terminal voltage of the motor can be directly used as the terminal voltage of the motor by acquiring the terminal voltage of the three-phase terminal because three groups of stator windings of the motor are connected with a three-phase power supplyPhase voltages. The sampling voltage value can be directly obtained through the sampling filter circuit.
In some embodiments, the sampled voltage values of the three-phase terminals of the motor are detected by a sampling filter circuit.
In the embodiments, the sampled voltage value of the three-phase terminal is the terminal voltage of the three-phase terminal of the motor, and the terminal voltage of the three-phase terminal of the motor can be directly acquired through the sampling filter circuit.
In some embodiments, the step of calculating the partial pressure coefficient by a formula specifically includes: and determining a voltage division coefficient according to the first resistance value and the second resistance value.
In these embodiments, the correction process may be selected not to be performed when calculating the actual phase voltage values of the three-phase terminals. At this time, when the voltage division coefficient is calculated, errors between a first resistance value calibrated by the first resistive element, a second resistance value calibrated by the second resistive element and a capacitance value calibrated by the capacitive element and an actual value do not need to be considered, so that the voltage division coefficient can be directly calculated according to the first resistance value, the second resistance value and the capacitance value.
In some embodiments, the voltage division coefficient can be calculated according to the first resistance value and the second resistance value by the following formula:
Figure BDA0002814433490000181
wherein K is a partial pressure coefficient, R1Is a first resistance value, R2Is the second resistance value.
In these embodiments, the voltage division coefficient is calculated from the first resistance value and the second resistance value.
In some embodiments, the step of obtaining actual phase voltage values of the three-phase terminals of the motor is preceded by the step of: and controlling the motor to start running at the set rotating speed.
In the embodiments, the voltage values of the three-phase terminals of the motor are related to the working state of the motor, and when the motor is in a stop operation state, the three-phase terminals of the motor do not have corresponding voltages, so that the motor is controlled to be in an operation state, and then the voltage values of the motor are calculated and collected.
Example three:
as shown in fig. 6, a third embodiment of the present invention provides a phase voltage detection method for a motor, where the phase voltage detection method is used for a motor, and a sampling filter circuit is connected to each of three-phase terminals of the motor, and the method includes:
step 602, acquiring a sampling voltage value of a three-phase terminal of a motor;
step 604, calculating a partial pressure coefficient through a formula;
step 606, calculating an actual phase voltage value through the voltage division coefficient and the sampling voltage value of the three-phase terminal;
step 608, obtaining a first resistance value of the first resistor, a second resistance value of the second resistor and a capacitance value of the capacitor;
step 610, collecting the actual rotating speed of the motor;
step 612, calculating the actual rotating speed value, the first resistance value, the second resistance value and the capacitance value to obtain a filter coefficient;
and 614, calculating through the filter coefficient and the actual phase voltage value to obtain a compensated phase voltage value.
In this embodiment, a first end of a first resistor in the sampling filter circuit is directly connected to one of the three-phase terminals, a second end of the first resistor is connected to a first end of a second resistor, a first end of a capacitor is connected to a first end of the second resistor, and a second end of the capacitor is connected to a second end of the second resistor. The first resistor and the second resistor are connected in series, and then the capacitor is connected with the second resistor in parallel. The first resistor, the second resistor and the capacitor divide voltage at one of the three-phase terminals connected with the first resistor, the second resistor and the capacitor, the first end position of the capacitor is used as an output end of a detection signal, namely the detected voltage signal is output through the first end of the capacitor, and a processor of the motor receives the voltage signal and calculates and processes the voltage signal to obtain corresponding phase voltage.
The filter coefficient of the sampling filter circuit is obtained by calculation, and the method specifically comprises the following steps: and acquiring a first resistance value of the first resistor, a second resistance value of the second resistor and a capacitance value of the capacitor, wherein the first resistance value, the second resistance value and the capacitance value can be directly obtained by type selection of the first resistor, the second resistor and the capacitor. The method comprises the steps of collecting the real-time rotating speed of a motor in a running state, wherein the voltage value of a three-phase terminal of the motor is in relation with the rotating speed of the motor, specifically, the voltage value is larger when the rotating speed of the motor is larger, and therefore a filter coefficient is a variable related to the real-time rotating speed of the motor. The filter coefficient of the sampling circuit can be obtained by calculating the first resistance value, the second resistance value, the capacitance value and the real-time rotating speed of the motor, and the accuracy of the actual phase voltage can be further improved by performing compensation calculation on the actual phase voltage through the filter coefficient.
And the actual phase voltage value can be obtained by calculation according to the voltage division coefficient and the sampling voltage value of the three-phase terminal. Therefore, the voltage division coefficient, the sampling voltage value of the three-phase terminal and the sampling voltage value need to be obtained, so that the sampling voltage value of the three-phase terminal is collected through the sampling filter circuit before calculation, and the voltage division coefficient is determined. And calculating the voltage division coefficient and the sampling voltage value of the three-phase terminal to obtain an actual phase voltage value.
As shown in fig. 7, in some embodiments, the step of calculating the partial pressure coefficient by a formula specifically includes:
step 702, calculating the average value of the three-phase voltage of the motor;
step 704, acquiring the voltage value of the motor and the bus, and the duty ratio, the period value and the signal response time of the pulse width modulation signal of the motor;
and 706, calculating according to the three-phase voltage average value, the voltage value of the motor and the bus, the duty ratio, the period value and the signal response time of the pulse width modulation signal of the motor to obtain a voltage division coefficient.
In this embodiment, the correction process may be selected to be performed when calculating the actual phase voltage values of the three-phase terminals. At this time, when calculating the voltage division coefficient, the error between the first resistance value calibrated by the first resistive element, the second resistance value calibrated by the second resistive element, and the capacitance value calibrated by the capacitive element and the actual value needs to be considered. Therefore, the period value of the PWM (pulse width modulation) of the motor, the corresponding time and duty ratio of the signal, and the bus voltage value of the motor need to be obtained. The method comprises the steps of obtaining a period value of PWM (pulse width modulation signal), corresponding time and duty ratio of the signal and a bus voltage value of a motor, calculating the period value, the corresponding time and the duty ratio according to a formula to obtain a voltage division ratio, and calculating an actual phase voltage value of a three-phase terminal according to a voltage division coefficient obtained through the calculation mode and a three-phase voltage average value to avoid the influence of errors of a resistance value and a capacitance value on a calculation result. The effect of calibrating the actual phase voltage values of the three-phase terminals is achieved.
It can be understood that the voltage division ratio can be obtained through the period value of the PWM (pulse width modulation) of the motor, the corresponding time of the signal and the duty ratio, and the voltage division coefficient can be calculated according to the obtained voltage division ratio, and the bus voltage value and the three-phase voltage average value of the motor.
Wherein, the corresponding time of the signal is the dead time of the pulse width modulation signal.
In some embodiments, the voltage division coefficient can be calculated by a formula through a three-phase voltage average value, a bus voltage value, a duty ratio of a pulse width modulation signal, a period value and a signal response time, and the specific formula is as follows:
Figure BDA0002814433490000201
Figure BDA0002814433490000202
wherein k isaIs the voltage division ratio, k, of the sampling filter circuit connected to the first phase of the three-phase terminalsbIs the voltage division ratio, k, of the sampling filter circuit connected to the second phase of the three-phase terminalscIs the voltage division ratio of the sampling filter circuit connected with the third phase of the three-phase terminal, eta is the duty ratio of the pulse width modulation signal of the motor, TwmIs the value of the period, T, of the pulse width modulated signaldFor signal response time, VdcIs a masterLine voltage, VADC a0Is the average value of the voltage of the first phase, V, in the three-phase terminalsADC_b0Is the average value of the voltage of the second phase, V, in the three-phase terminalsADC_C0Is the average value of the voltage of the third phase in the three-phase terminals.
In these embodiments, the voltage division coefficients on different phases are calculated by sampling filter circuits connected to the different phases in the three-phase terminals, respectively. And calculating according to the different voltage division coefficients and the average voltage values of different phases in the three-phase terminal to obtain the actual phase voltage value. The actual phase voltage value is the actual phase voltage value after calibration, so that the influence of a resistance value and a capacitance value in the sampling filter circuit is eliminated, and the accuracy of the obtained compensated phase voltage value is further improved.
As shown in fig. 8, the step of calculating the average value of the three-phase voltage of the motor specifically includes:
step 802, acquiring a set time length, and acquiring three-phase voltage values in the set time length through a sampling filter circuit;
and step 804, carrying out average calculation on the three-phase voltage values within the set time length to obtain the three-phase voltage average value of the motor.
In the embodiments, the average value of the three-phase voltage values of the motor is calculated, and the average value of the three-phase voltage values in the set time period can be obtained by dividing the three-phase voltage values in the set time period by the set time period.
Wherein the set duration is related to a period value of the PWM signal.
In some embodiments, the step of obtaining the sampled voltage values of the three-phase terminals of the motor is preceded by the step of: and controlling the motor to start running at the set rotating speed.
In the embodiments, the voltage values of the three-phase terminals of the motor are related to the working state of the motor, and when the motor is in a stop operation state, the three-phase terminals of the motor do not have corresponding voltages, so that the motor is controlled to be in an operation state, and then the voltage values of the motor are calculated and collected.
Example four:
as shown in fig. 9, a fourth embodiment of the present invention provides a phase voltage detection apparatus 900 for an electric motor, including: a memory 902, the memory 902 having programs or instructions stored therein; a processor 904, the processor 904 executing a program or instructions stored in the memory 902 to implement a method of detecting phase voltages of a motor as in any of the embodiments described above.
The processor 904 in the phase voltage detection apparatus provided by the present invention can execute the instructions or programs on the memory 902, thereby timing the phase voltage detection method of the motor in any one of the possible designs, and thus having all the beneficial effects of the phase voltage detection method in any one of the possible designs, and not being described herein again.
Example five:
as shown in fig. 10, a fifth embodiment of the present invention provides an electric appliance 1000 including: motor 1002 and motor phase voltage detection device 900. The phase voltage detection device 900 of the motor is the phase voltage detection device 900 of the motor in the fourth embodiment, and the phase voltage detection device 900 of the motor is connected with the motor 1002.
In this embodiment, the electrical apparatus 1000 includes a motor 1002 and a voltage detection device connected to the motor, the voltage detection device being capable of performing a voltage detection method to detect a phase voltage in an operating state of the motor.
The three-phase terminals of the motor are provided with sampling filter circuits, and the sampling filter circuits can collect phase voltages on corresponding stator windings in the three-phase stator windings of the three-phase motor. The three-phase terminals of the motor are connected with the three-phase inverter, the three-phase inverter supplies power to the three stator windings of the motor through the three-phase terminals of the motor, the sampling filter circuit is arranged on the three-phase terminals between the three-phase inverter and the stator windings, and phase voltage on the three-phase terminals of the motor can be accurately collected.
The phase voltage detection method of the motor needs to acquire voltage values of three-phase terminal positions of the motor through a sampling filter circuit, actual phase voltage values of the three-phase terminals are obtained through calculation according to the acquired voltage values, the actual phase voltage values of the three-phase terminals specifically include three voltage values, and the three voltage values correspond to phase voltages of three different stator windings in the motor. The sampling circuit comprises a resistive element and a capacitive element, namely a resistor and a capacitor, wherein filtering is performed through the capacitor, so that the accuracy of the acquired voltage value is improved, the influence of other interference information on the acquired voltage result is avoided, and the filtering parameters of the sampling filter circuit are determined under the current state according to the self attribute parameters of each part in the sampling circuit and the working condition of the sampling circuit. And calculating according to the obtained filter coefficient and the actual phase voltage value of the three-phase motor so as to compensate the actual phase voltage value, and compensating after voltage amplitude attenuation and voltage phase caused by filtering of the sampling filter circuit. Therefore, the phase voltage of the motor can be accurately obtained through the method, the measurement of the phase voltage is simpler, a complex voltage acquisition circuit is not required to be arranged in the motor, and the accuracy of obtaining the phase voltage is improved on the premise of not increasing the extra production cost of the motor.
It can be understood that three groups of stator windings of the motor are connected with a three-phase power supply, so that the collected terminal voltages can be directly used as phase voltages of the motor by collecting the terminal voltages on three-phase terminals. Therefore, the voltage sampling module is arranged to collect the voltage on the three-phase terminal of the motor. The voltage sampling module comprises three sampling filter circuits, each sampling filter circuit is connected to different terminals, the voltages on the different terminals are collected, and the collected voltages are calculated to obtain phase voltages.
It is understood that the electric appliances include a blower, an air conditioner, and a washing machine. Of course, other electric devices provided with motors may be used, and the electric devices are not limited to the above three types.
Example six:
as shown in fig. 11, a sixth embodiment of the present invention provides a phase voltage detecting apparatus 1100 of an electric machine, which includes a terminal voltage detecting module 1102, a terminal voltage sampling module 1104, a terminal voltage correcting module 1106, a voltage compensating module 1108, and a voltage converting module 1110.
The terminal voltage detection module 1102 includes a sampling filter circuit, where the sampling filter circuit includes a first resistive element, a second resistive element, and a capacitive element, where the first resistive element is connected in series with the second resistive element, and the second resistive element is connected in parallel with the capacitive element.
The terminal voltage sampling module 1104 samples the voltage of the capacitive element through the converter as a terminal voltage.
It can be understood that three groups of stator windings of the motor are connected with a three-phase power supply, so that the collected terminal voltages can be directly used as phase voltages of the motor by collecting the terminal voltages on three-phase terminals.
A terminal voltage correction module 1106, configured to correct the sampled voltage;
a voltage compensation module 1108, configured to compensate for the sampled voltage;
and a voltage conversion module 1110, configured to convert the compensated voltage into a phase voltage of the motor.
The first resistive element is represented by a first resistance, the second resistive element by a second resistance, and the capacitive element by a capacitance.
In this embodiment, the resistance R of the first resistor1A resistance value R of the second resistor2The capacitance value C of the capacitor and the frequency f of the PWM need to satisfy the following relation:
Figure BDA0002814433490000231
in this embodiment, the resistance R of the first resistor1And the resistance value R of the second resistor2The following relationship is also required to be satisfied:
Figure BDA0002814433490000232
wherein, VmaxIndicating the maximum value, V, that the terminal voltage of the machine may reachdRepresenting the supply voltage of the sampling circuit used by the voltage sampling module.
Example seven:
in a seventh embodiment of the present invention, there is provided a readable storage medium, on which a program is stored, the program, when executed by a processor, implementing the phase voltage detection method of the motor as in any one of the above-mentioned embodiments, thereby having all the advantageous technical effects of the phase voltage detection method of the motor as in any one of the above-mentioned embodiments.
The readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 (15)

1. A phase voltage detection method of a motor is characterized in that three-phase terminals of the motor are connected with sampling filter circuits, and the method comprises the following steps:
acquiring actual phase voltage values of the three-phase terminals;
acquiring a filter coefficient of the sampling filter circuit;
and obtaining the compensated phase voltage value of the three-phase terminal according to the actual phase voltage value and the filter coefficient.
2. The phase voltage detection method of an electric motor according to claim 1, wherein the sampling filter circuit includes: the sampling filter circuit comprises a first resistive element, a second resistive element and a capacitive element, wherein a first end of the first resistive element is connected with the three-phase terminal, a second end of the first resistive element is connected with a first end of the second resistive element, a first end of the capacitive element is connected with a first end of the second resistive element, a second end of the capacitive element is connected with a second end of the second resistive element, and the step of obtaining a filter coefficient of the sampling filter circuit specifically comprises:
acquiring a first resistance value of the first resistive element, a second resistance value of the second resistive element and a capacitance value of the capacitive element;
acquiring the actual rotating speed of the motor;
and calculating a filter coefficient of the sampling filter circuit according to the first resistance value, the second resistance value, the capacitance value and the actual rotating speed value.
3. The phase voltage detection method of an electric machine according to claim 2, wherein the step of calculating the compensated phase voltage values of the three-phase terminals based on the actual phase voltage values and the filter coefficients specifically comprises:
performing conversion operation on the actual phase voltage value to obtain a two-phase voltage actual value under a static coordinate;
calculating a compensated two-phase voltage value according to the filter coefficient and the two-phase voltage actual value;
and performing conversion operation on the compensated two-phase voltage value to obtain the compensated phase voltage value of the three-phase terminal.
4. The phase voltage detection method of an electric motor according to claim 2, wherein the first resistance value, the second resistance value, and the capacitance value of the capacitive element satisfy the following relationship:
Figure FDA0002814433480000021
wherein f is the frequency of the PWM signal, R1 is a first resistance, R2 is a second resistance, and C is a capacitance.
5. The phase voltage detection method of an electric motor according to claim 4, wherein the first resistance value and the second resistance value satisfy the following relationship:
Figure FDA0002814433480000022
wherein R is1Is a first resistance value, R2Is a second resistance value, Vmax is the maximum voltage value of the motor, VdIs the supply voltage of the sampling filter circuit.
6. The phase voltage detection method of the motor according to any one of claims 2 to 5, wherein the step of calculating actual phase voltage values of three-phase terminals of the motor specifically includes:
acquiring a sampling voltage value of a three-phase terminal of the motor;
calculating a partial pressure coefficient;
and calculating the actual phase voltage value according to the sampling voltage value of the three-phase terminal and the voltage division coefficient.
7. The phase voltage detection method of the motor according to claim 6, wherein the step of obtaining the sampled voltage values of the three-phase terminals of the motor specifically comprises:
and detecting the sampling voltage value of the three-phase terminal of the motor through the sampling filter circuit.
8. The phase voltage detection method of the motor according to claim 7, wherein the step of calculating the voltage division coefficient specifically includes:
and calculating the voltage division coefficient according to the first resistance value and the second resistance value.
9. The phase voltage detection method of the motor according to claim 7, wherein the step of calculating the voltage division coefficient specifically includes:
calculating the average value of the three-phase voltage of the motor;
acquiring a period value, a duty ratio and signal response time of a pulse width modulation signal of the motor and a bus voltage value of the motor;
and calculating the voltage division coefficient according to the bus voltage value, the period value of the motor, the duty ratio, the signal response time and the three-phase voltage average value.
10. The phase voltage detection method of the motor according to claim 9, wherein the step of calculating the average value of the three-phase voltages of the motor specifically includes:
acquiring a set time length, and acquiring three-phase voltage values in the set time length through the sampling filter circuit;
and calculating the three-phase voltage average value of the motor according to the set time length and the three-phase voltage value in the set time length.
11. The phase voltage detection method of an electric motor according to any one of claims 1 to 5, characterized by further comprising, before the step of acquiring actual phase voltage values of three-phase terminals of the electric motor:
and controlling the motor to start running.
12. A phase voltage detection device of a motor, characterized by comprising:
a memory having a program or instructions stored therein;
a processor executing a program or instructions stored in the memory to implement a phase voltage detection method of an electric machine according to any one of claims 1 to 11.
13. An electrical appliance, comprising:
a motor;
the phase voltage detecting device of the motor according to claim 12, said phase voltage detecting device being connected to said motor.
14. The electric appliance according to claim 13,
the electric appliance comprises a fan, an air conditioner and a washing machine.
15. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, carry out the steps of the phase voltage detection method of an electric machine according to any one of claims 1 to 11.
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