CN110838812A - Washing machine and temperature detection method and device of variable frequency motor of washing machine - Google Patents
Washing machine and temperature detection method and device of variable frequency motor of washing machine Download PDFInfo
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- 238000005406 washing Methods 0.000 title claims abstract description 96
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 148
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/64—Controlling or determining the temperature of the winding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
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Abstract
The invention provides a washing machine and a temperature detection method and a temperature detection device of a variable frequency motor of the washing machine, wherein the method comprises the following steps: the method comprises the steps of inputting direct current to any phase winding of three-phase windings of the variable frequency motor, wherein the current is a first current value, positioning the variable frequency motor, increasing the input direct current to a second current value, collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a first actual current and a first actual voltage, continuously increasing the input direct current to a third current value, collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a second actual current and a second actual voltage, calculating equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage, and calculating winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor, so that temperature rise protection of the variable frequency motor is achieved.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a temperature detection method of a variable frequency motor in a washing machine, a temperature detection device of the variable frequency motor in the washing machine and the washing machine with the temperature detection device.
Background
With the popularization of the frequency conversion technology and the further reduction of the cost of power devices, the frequency conversion driving technology is rapidly developed in the field of household appliances. The washing machine is taken as the main product of the traditional household appliance, and in recent years, the ratio of the variable frequency products is greatly improved. A variable-frequency driving system of a washing machine consists of a driving motor and a variable-frequency controller, and in practical application, from the safety perspective, the design of the protection function of the variable-frequency driving system needs to be carried out on multiple dimensions such as voltage, current, power, temperature and the like.
In the related technology, a motor temperature rise protection scheme is provided for a washing machine variable frequency driving system, and a protection function design is carried out by adopting a mode of arranging a temperature protector in a motor winding or indirectly estimating the temperature of a motor by utilizing a temperature sensor carried by a power driving module. Namely, a temperature protector is arranged in the clutch or among the motor windings, when the temperature in the temperature protector exceeds the upper protection limit, the motor windings are automatically and mechanically disconnected, the motor stops running, and when the temperature of the windings is lower than the lower protection limit, the motor is automatically attracted to continue running. According to the scheme, an external temperature sensor and electronic control are not needed, protection and recovery are completely realized by the characteristics of the thermal protector, and the method is simple and reliable. However, the design of the motor body needs to reserve the installation space of the thermal protector, the design and the manufacturing process are complicated, and because of the problem of the processing process, the difference exists among motor single products, so that the mechanical temperature protection points are difficult to keep higher consistency. In addition, the thermal protector completely depends on the characteristics of the thermal protector, the protection points and the protection mode are single and solidified, if the protection points need to be changed, the thermal protector needs to be redesigned, and the protection mechanism can not be quickly and flexibly designed and adjusted according to practical application.
In the related art, a method for detecting the temperature of the contact surface between the heat sink and the power module by using a temperature sensor carried by the power driving module in the variable frequency controller to perform multi-gear protection design is also provided. The method is simple in design, can directly use the acquired temperature data, and is one of protection modes which are commonly applied at present. However, the temperature detected by the controller is not the actual temperature of the motor winding, but is an estimated value which is corrected according to the temperature of the radiating fins and an empirical value, and the accuracy of the estimated value depends on factors such as the structural design of the radiator, the radiating environment and the like. When the whole system is good in ventilation and heat dissipation effect and runs in an overload mode, the situation that the temperature of the heat dissipation fins does not reach a protection threshold value and the temperature of a motor winding is seriously over-temperature can occur, and then the motor is damaged, so that certain potential safety hazards exist.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present invention is to provide a method for detecting a temperature of an inverter motor in a washing machine, which can accurately calculate a winding temperature of the inverter motor, thereby implementing temperature rise protection for the inverter motor.
The second purpose of the invention is to provide a temperature detection device of an inverter motor in a washing machine.
A third object of the present invention is to provide a washing machine.
In order to achieve the above object, a first embodiment of the present invention provides a method for detecting temperature of a variable frequency motor in a washing machine, comprising the steps of: inputting direct current to any phase winding of three-phase windings of the variable frequency motor, wherein the current is a first current value so as to position the variable frequency motor; increasing the input direct current to a second current value, and collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a first actual current and a first actual voltage; continuously increasing the input direct current to a third current value, and collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a second actual current and a second actual voltage; calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage; and calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor.
According to the temperature detection method of the variable frequency motor in the washing machine, direct current with the first current value is firstly input to any phase winding of three-phase windings of the variable frequency motor so as to position the variable frequency motor. After the variable frequency motor is positioned, the input direct current is increased to a second current value, the current flowing through the three-phase winding and the voltage of the three-phase winding are collected to obtain a first actual current and a first actual voltage, then, the input direct current is continuously increased to a third current value, and the current flowing through the three-phase winding and the voltage of the three-phase winding are collected to obtain a second actual current and a second actual voltage. And then, calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage. And finally, calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor. Therefore, the method can accurately calculate the winding temperature of the variable frequency motor, and therefore temperature rise protection of the variable frequency motor is achieved.
In addition, the method for detecting the temperature of the variable frequency motor in the washing machine according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the calculating an equivalent resistance of the inverter motor according to the first actual current, the first actual voltage, the second actual current, and the second actual voltage includes: acquiring a voltage difference between the second actual voltage and the first actual voltage; obtaining a current difference between the second actual current and the first actual current; and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
According to an embodiment of the present invention, the method for detecting and protecting the temperature of the variable frequency motor in the washing machine further includes: after the first actual current and the first actual voltage are obtained, filtering the first actual current and the first actual voltage to obtain a first current filter value and a first voltage filter value; after the second actual current and the second actual voltage are obtained, filtering the second actual current and the second actual voltage to obtain a second current filter value and a second voltage filter value; and calculating the equivalent resistance of the variable frequency motor according to the first current filter value, the first voltage filter value, the second current filter value and the second voltage filter value.
According to an embodiment of the present invention, calculating the equivalent resistance of the inverter motor based on the first current filtered value, the first voltage filtered value, the second current filtered value, and the second voltage filtered value includes: acquiring a voltage difference between the second voltage filter value and the first voltage filter value; obtaining a current difference between the second current filter value and the first current filter value; and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
According to one embodiment of the invention, the winding temperature of the inverter motor is calculated according to the following formula:
T＝k1*Req+k2
wherein T is the winding temperature of the variable frequency motor, ReqIs an equivalent resistance, k, of the inverter motor1、k2Is a constant.
According to an embodiment of the present invention, the method for detecting the temperature of the variable frequency motor in the washing machine further includes: and when the winding temperature of the variable frequency motor is greater than or equal to a third temperature threshold value, controlling the variable frequency motor to stop.
According to an embodiment of the present invention, the method for detecting the temperature of the variable frequency motor in the washing machine further includes: and when the winding temperature of the variable frequency motor is greater than or equal to a second temperature threshold and less than a third temperature threshold, reducing the washing rhythm of the washing machine until the winding temperature of the variable frequency motor is less than a first temperature threshold, wherein the first temperature threshold is less than the second temperature threshold.
In order to achieve the above object, a second embodiment of the present invention provides a temperature detecting device for an inverter motor in a washing machine, comprising: the input module is used for sequentially inputting direct current with the current magnitude of a first current value to any phase winding of three-phase windings of the variable frequency motor, increasing the current magnitude to a second current value and then increasing the current magnitude to a third current value; (ii) a The electric acquisition module is used for acquiring the current and the voltage of the three-phase winding when the current magnitude is the second current value so as to obtain a first actual current and a first actual voltage, and acquiring the current and the voltage of the three-phase winding when the current magnitude is the third current value so as to obtain a second actual current and a second actual voltage; the resistance value calculating module is used for calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage, and the temperature calculating module is used for calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor.
According to the temperature detection device of the variable frequency motor in the washing machine, direct current with the current magnitude of the first current value is sequentially input to any phase winding of three-phase windings of the variable frequency motor through the input module, the current magnitude is increased to the second current value and then is increased to the third current value, the current and the voltage of the three-phase windings are collected through the electricity collecting module when the current magnitude is the second current value so as to obtain the first actual current and the first actual voltage, the current and the voltage of the three-phase windings when the current magnitude is the third current value so as to obtain the second actual current and the second actual voltage, the resistance value calculating module calculates the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage, the temperature calculating module calculates the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor, therefore, the device can accurately calculate the winding temperature of the variable frequency motor, and therefore temperature rise protection of the variable frequency motor is achieved.
In addition, the temperature detection device for an inverter motor in a washing machine according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the calculation module is further configured to obtain a voltage difference between the second actual voltage and the first actual voltage, obtain a current difference between the second actual current and the first actual current, and use a ratio of the voltage difference to the current difference as an equivalent resistance of the inverter motor.
According to an embodiment of the present invention, the temperature detecting apparatus for an inverter motor in a washing machine, the resistance value calculating module further includes: the filtering unit is used for filtering the first actual current and the first actual voltage acquired by the electricity acquisition module to obtain a first current filtering value and a first voltage filtering value; filtering the collected second actual current and second actual voltage to obtain a second current filter value and a second voltage filter value; and the resistance value calculation module calculates the equivalent resistance of the variable frequency motor according to the first current filter value, the first voltage filter value, the second current filter value and the second voltage filter value.
According to one embodiment of the invention, the resistance value calculating module calculates the equivalent resistance of the variable frequency motor as follows: and acquiring a voltage difference between the second voltage value and the first voltage filter value, acquiring a current difference between the second current filter value and the first current filter value, and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
According to one embodiment of the invention, the temperature calculation module calculates the winding temperature of the inverter motor according to the following formula:
T＝k1*Req+k2
wherein T is the winding temperature of the variable frequency motor, ReqIs an equivalent resistance, k, of the inverter motor1、k2Is a constant.
According to an embodiment of the present invention, the temperature detecting apparatus for an inverter motor in a washing machine further includes: and the control module is used for controlling the variable frequency motor to stop when the winding temperature of the variable frequency motor is greater than or equal to a third temperature threshold value.
According to an embodiment of the invention, the control module is further configured to reduce a washing cycle of the washing machine until the winding temperature of the inverter motor is less than a first temperature threshold when the winding temperature of the inverter motor is greater than or equal to a second temperature threshold and less than a third temperature threshold, wherein the first temperature threshold is less than the second temperature threshold.
In order to achieve the above object, a third embodiment of the present invention provides a washing machine, which includes the temperature detection device for an inverter motor in the washing machine.
According to the washing machine provided by the embodiment of the invention, the temperature rise protection of the variable frequency motor can be realized through the temperature detection device of the variable frequency motor in the washing machine.
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 foregoing 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 of a temperature detection method of an inverter motor in a washing machine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a variable frequency motor DC current supply according to one embodiment of the present invention;
FIGS. 3(a) and 3(b) are schematic diagrams of three-phase winding inductance of the inverter motor according to an embodiment of the invention;
FIG. 4 is a schematic diagram of variable frequency motor winding resistance versus winding temperature in accordance with one embodiment of the present invention;
FIG. 5 is a logic diagram illustrating a method for detecting a temperature of an inverter motor in a washing machine according to an embodiment of the present invention;
fig. 6 is a block schematic view of a temperature detecting apparatus of an inverter motor in a washing machine according to an embodiment of the present invention;
fig. 7 is a block diagram schematically illustrating a temperature detecting apparatus of an inverter motor in a washing machine according to an embodiment of the present invention; and
fig. 8 is a block diagram illustrating a temperature sensing apparatus of an inverter motor in a washing machine according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A temperature detection method of a variable frequency motor in a washing machine, a temperature detection device of a variable frequency motor in a washing machine, and a washing machine having the temperature detection device according to embodiments of the present invention will be described below with reference to the accompanying drawings.
In one embodiment of the present invention, the washing machine may include a drum washing machine, a pulsator washing machine, and a dryer. The washing machine may include an inverter motor, wherein the inverter motor is not limited to a brushless dc motor, a permanent magnet synchronous motor, an asynchronous motor, and a reluctance-type motor.
Fig. 1 is a flowchart of a method for detecting a temperature of an inverter motor in a washing machine according to an embodiment of the present invention.
As shown in fig. 1, the method for detecting the temperature of the inverter motor in the washing machine according to the embodiment of the present invention may include the following steps:
and S1, inputting direct current to any phase winding of the three-phase windings of the variable frequency motor, wherein the current is the first current value, so as to position the variable frequency motor.
And S2, increasing the input direct current to a second current value, and collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a first actual current and a first actual voltage.
And S3, continuing to increase the input direct current to a third current value, and collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a second actual current and a second actual voltage.
And S4, calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage.
And S5, calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor.
The first current value, the second current value and the third current value can be calibrated according to actual conditions.
According to one embodiment of the invention, calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage comprises the following steps: acquiring a voltage difference between the second actual voltage and the first actual voltage; acquiring a current difference between the second actual current and the first actual current; and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
Specifically, before the inverter motor is started, direct current is directly input into any phase winding of the three-phase winding, for example, direct current with a first current value is input into the a-phase winding, and the holding time and the current value are shown in fig. 2, wherein I1 represents the first current value, I2 represents the second current value, and I3 represents the third current value.
Next, how to calculate the winding temperature of the inverter motor will be described by taking as an example a dc current having a first current value as an input current to the a-phase winding.
The first stage is as follows: (positioning stage 0-t1), for the variable frequency motor of the washing machine, the variable frequency motor can be locked to a specified angle by constant direct current, and due to the existence of load, the initial position of the variable frequency motor is not at the required specified angle, therefore, after direct input of direct current with the first current value I1 into the A-phase winding, the inner barrel of the washing machine can shake for a period of time in a small amplitude, the shaking time does not exceed t1 time, under the action of the magnetic field of the variable frequency motor, before the stage is finished, the angle of the variable frequency motor can be locked, the inner barrel stops shaking completely, and the positioning of the variable frequency motor is realized.
In the second stage (t1-t3), the input direct current is increased to a second current value I2, and when the actual input current reaches the second current value I2, namely t2, the actual voltage and the actual current flowing through the three-phase winding are collected to obtain a first actual current Id2And a first actual voltage Vd2。
In the third stage (t3-t5), the input direct current is continuously increased to a third currentWhen the actual input current reaches the third current value I3, i.e. t4, the value I3 starts to collect the actual voltage and the actual current flowing through the three-phase winding to obtain the second actual current Id3And a second actual voltage Vd3。
When the first actual current I is obtainedd2First actual voltage Vd2A second actual current Id3And a second actual voltage Vd3Then, a second actual voltage V is obtainedd3And a first actual voltage Vd2A voltage difference therebetween, and a second actual current I is obtainedd3And the first actual current Id2And the ratio of the voltage difference to the current difference is used as the equivalent resistance of the variable frequency motor. Namely Req＝(Vd3-Vd2)/(Id3l-Id2)。
Specifically, after injecting the dc current into the a-phase winding, the inductance and current states in the three-phase winding are shown in fig. 3(a), where La, Ra, and Ia are the inductance, resistance, and current corresponding to the a-phase winding, Lb, Rb, and Ib are the inductance, resistance, and current corresponding to the B-phase winding, and Lc, Rc, and Ic are the inductance, resistance, and current corresponding to the C-phase winding. The winding of the variable frequency motor can be equivalent to a combination of resistance and inductance, when direct current passes through the winding, the inductance of the winding is zero, the winding is equivalent to resistance characteristics, and an equivalent circuit is shown in fig. 3(b), wherein Id is current flowing through the winding, and Vd is voltage across the winding.
According to ohm's law, R-V/I, the actual equivalent resistance can be calculated. However, when the magnitude of the input direct current is increased, the process is not an ideal process as shown in fig. 2, and the response process of the current increase may bring about fluctuations of the current and the voltage, so that the collected current and voltage values may deviate, which includes the above-mentioned first actual current Id2First actual voltage Vd2A second actual current Id3And a second actual voltage Vd3. Therefore, it is preferable to apply the second actual voltage Vd3And a first actual voltage Vd2The voltage difference between and the second actual current Id3And the first actual current Id2The ratio of the two is used as the equivalent resistance, soIn the case that the two measurements are performed after the current is increased in a similar manner, the influence of the fluctuation can be directly counteracted through the calculation of the difference value of the two measurements. Of course, other calculation methods for performing cancellation using two sets of voltages and currents may be used, such as the least squares method.
Furthermore, a calculation method using three or more sets of voltages and currents may be adopted, as long as the scheme does not exceed the concept of the present invention, and even if the number of measurements exceeds two times, the data of the number of measurements still adopts a similar scheme or only serves as supplementary data for further improving the accuracy, which should be regarded as using at least the first actual current Id2First actual voltage Vd2A second actual current Id3And a second actual voltage Vd3Within the range of equivalent resistance calculations performed.
And finally, obtaining the winding temperature of the variable frequency motor according to the relation between the resistance and the temperature.
Further, according to an embodiment of the present invention, the winding temperature of the inverter motor may be calculated according to the following formula (1):
T＝k1*Req+k2(1)
wherein T is the winding temperature of the variable frequency motor, ReqIs the equivalent resistance, k, of the inverter motor1、k2Is a constant.
For the variable frequency motor, the relationship between the winding resistance and the temperature rise is shown in the following formula (2),
R2＝R1*(K+T2)/(K+T1) (2)
wherein K is the resistance temperature constant, R1、R2Respectively, winding temperature is T1、T2The corresponding winding resistance value.
Equation (2) is further derived:
R2/(K+T2)＝R1/(K+T1) (3)
for any corresponding R in the above formula1、R2、T1、T2All are true, that is, for any RnAnd Tn，Rn/(K+Tn) For a constant value, R can be obtainednAnd TnIs a linear relationship. By simplification and bringing into the R obtainedeqAnd (3) obtaining the formula (1), namely calculating the winding temperature of the variable frequency motor. The specific winding resistance versus winding temperature relationship is shown in fig. 4.
In an embodiment of the present invention, after obtaining the first actual current and the first actual voltage, filtering processing is performed on the first actual current and the first actual voltage, and after obtaining the second actual current and the second actual voltage, filtering processing is performed on the second actual current and the second actual voltage. And calculating the equivalent resistance of the variable frequency motor by using the filtered currents and voltages as a calculated voltage difference and a current difference.
That is, as shown in FIG. 2, the first actual voltage V is applied during the time t2-t3d2And a first actual current Id2Filtering to output the filtered first voltage value Vd2lpfAnd a first current filter value Id2lpf. For the second actual voltage V in the time t3-t5d3And a second actual current Id3Filtering to output filtered second voltage value Vd3lpfAnd a second current filter value Id3lpf. Filtering the second voltage by a value Vd3lpfAnd a first voltage filtered value Vd2lpfVoltage difference and second current filter value Id3lpfAnd a first current filter value Id2lpfAs the equivalent resistance of the inverter motor, i.e. Req＝(Vd3lpf-Vd2lpf)/(Id3lpf-Id2lpf). And then obtaining the winding temperature of the variable frequency motor according to the relation between the resistance and the temperature. The specific calculation method can also refer to formula (1), and is not described herein again.
Therefore, the winding temperature T of the variable frequency motor can be calculated and obtained through the mode.
In summary, the temperature detection method of the variable frequency motor in the washing machine adopts a three-section type direct current positioning mode, the angle of the variable frequency motor is locked after the variable frequency motor is dragged to a specified angle through positioning, the inner barrel of the washing machine is prevented from shaking, actual voltage and actual current values are collected on the basis, and the stability and the precision of the collected values are ensured. And calculating the actual winding temperature of the variable frequency motor by using the theoretical relationship between the winding resistance of the variable frequency motor and the temperature and acquiring and calculating the obtained equivalent resistance value. Moreover, the variable frequency motor or the clutch does not need to be specially designed and provided with a thermal protector, and the calculated temperature value is the actual temperature of the variable frequency motor winding, so that the detection result is more accurate and reliable compared with a protection mode of the temperature of the power driving module radiator.
According to an embodiment of the present invention, the method for detecting the temperature of the variable frequency motor in the washing machine further includes: and when the winding temperature of the variable frequency motor is greater than or equal to a third temperature threshold value, controlling the variable frequency motor to stop, wherein the third temperature threshold value can be calibrated according to the actual condition.
Further, according to an embodiment of the present invention, the method for detecting the temperature of the variable frequency motor in the washing machine further includes: and when the winding temperature of the variable frequency motor is greater than or equal to the second temperature threshold and less than the third temperature threshold, reducing the washing beat of the washing machine until the winding temperature of the variable frequency motor is less than the first temperature threshold, wherein the first temperature threshold is less than the second temperature threshold, and the first temperature threshold and the second temperature threshold can be calibrated according to the actual situation.
Specifically, as shown in fig. 5, before the inverter motor is started each time, direct current is injected in a segmented manner, pre-positioning is performed in sequence, an actual voltage value and an actual current value of a three-phase winding flowing through the inverter motor are obtained, and an equivalent resistance R is calculatedeqAnd then further obtaining the winding temperature T of the variable frequency motor. Performing temperature rise protection on the basis of obtaining the winding temperature T of the variable frequency motor, for example, controlling the variable frequency motor to actively stop protection when the winding temperature T is more than or equal to a third temperature threshold T3; when the second temperature threshold T2 is not less than T and is less than T3, the washing beat of the washing machine is controlled to be reduced, the stopping time is doubled, and the flag Pweak _ flag is set to be 1; when the first temperature threshold T1 is not less than T and is less than T2, and the washing machine is operated at the reduced washing tempo at the moment, namely Pweak _ flag is 1, the washing machine is controlled to continue to operate at the reduced washing tempo, otherwise, the washing machine is operated at the normal washing tempoA row; when T < T1, the flag Pweak _ flag is cleared, and the washing machine operates at a normal washing beat.
In summary, before the inverter motor is started each time, the method for detecting temperature detects the actual voltage value and the actual current value of the equivalent winding by inputting direct current to one phase of the inverter motor, calculates the equivalent resistance value, directly calculates the winding temperature value of the inverter motor by using the relationship between the winding resistance of the inverter motor and the temperature change, and performs the over-temperature protection processing of the inverter motor according to the temperature range of the winding temperature value, thereby realizing the temperature rise protection of the inverter motor.
In summary, according to the method for detecting the temperature of the inverter motor in the washing machine of the embodiment of the invention, the direct current with the first current value is firstly input to any one phase winding of the three-phase windings of the inverter motor, so as to position the inverter motor. After the variable frequency motor is positioned, the input direct current is increased to a second current value, the current flowing through the three-phase winding and the voltage of the three-phase winding are collected to obtain a first actual current and a first actual voltage, then, the input direct current is continuously increased to a third current value, and the current flowing through the three-phase winding and the voltage of the three-phase winding are collected to obtain a second actual current and a second actual voltage. And then, calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage. And finally, calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor. Therefore, the method can accurately calculate the winding temperature of the variable frequency motor, and therefore temperature rise protection of the variable frequency motor is achieved.
Fig. 6 is a block diagram illustrating a temperature detection apparatus of an inverter motor in a washing machine according to an embodiment of the present invention.
As shown in fig. 6, the temperature detecting apparatus of an inverter motor in a washing machine according to an embodiment of the present invention may include: the device comprises an input module 10, an electricity acquisition module 20, a resistance value calculation module 30 and a temperature calculation module 40.
The input module 10 is configured to sequentially input a direct current with a first current value to any one of three-phase windings of the variable frequency motor, increase the current to a second current value, and increase the current to a third current value. And the electricity acquisition module 20 is configured to acquire the current and the voltage of the three-phase winding when the current magnitude is the second current value to obtain a first actual current and a first actual voltage, and acquire the current and the voltage of the three-phase winding when the current magnitude is the third current value to obtain a second actual current and a second actual voltage. The resistance value calculating module 30 is configured to calculate an equivalent resistance of the inverter motor according to the first actual current, the first actual voltage, the second actual current, and the second actual voltage. The temperature calculation module 40 is used for calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor.
According to one embodiment of the present invention, the resistance value calculating module 30 calculates the equivalent resistance of the inverter motor as follows: and acquiring a voltage difference between the second actual voltage and the first actual voltage, acquiring a current difference between the second actual current and the first actual current, and taking a ratio of the voltage difference to the current difference as an equivalent resistance of the variable frequency motor.
According to an embodiment of the present invention, as shown in fig. 7, the resistance value calculating module 30 further includes: the filtering unit 31 is configured to filter the first actual current and the first actual voltage acquired by the electrical acquisition module 20 to obtain a first current filter value and a first voltage filter value; and filtering the collected second actual current and the second actual voltage to obtain a second current filter value and a second voltage filter value. The resistance value calculating module 30 calculates the equivalent resistance of the variable frequency motor according to the first current filter value, the first voltage filter value, the second current filter value and the second voltage filter value.
According to one embodiment of the present invention, the resistance value calculating module 30 calculates the equivalent resistance of the inverter motor as follows: and acquiring a voltage difference between the second voltage value and the first voltage filtering value, acquiring a current difference between the second current filtering value and the first current filtering value, and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
According to one embodiment of the present invention, the temperature calculation module 40 calculates the winding temperature of the inverter motor according to the above formula (1).
According to an embodiment of the present invention, as shown in fig. 8, the temperature detecting apparatus for a variable frequency motor in a washing machine further includes: and the control module 50 is used for controlling the variable frequency motor to stop when the winding temperature of the variable frequency motor is greater than or equal to a third temperature threshold value.
According to an embodiment of the present invention, the control module 50 is further configured to reduce the washing cycle of the washing machine when the winding temperature of the inverter motor is greater than or equal to the second temperature threshold and less than the third temperature threshold until the winding temperature of the inverter motor is less than the first temperature threshold, wherein the first temperature threshold is less than the second temperature threshold.
It should be noted that, for details not disclosed in the temperature detection apparatus for an inverter motor in a washing machine according to the embodiment of the present invention, please refer to details disclosed in the temperature detection method for an inverter motor in a washing machine according to the embodiment of the present invention, and details are not repeated.
According to the temperature detection device of the variable frequency motor in the washing machine, direct current with the current magnitude of the first current value is sequentially input to any phase winding of three-phase windings of the variable frequency motor through the input module, the current magnitude is increased to the second current value and then is increased to the third current value, the current and the voltage of the three-phase windings are collected through the electricity collecting module when the current magnitude is the second current value so as to obtain the first actual current and the first actual voltage, the current and the voltage of the three-phase windings when the current magnitude is the third current value so as to obtain the second actual current and the second actual voltage, the resistance value calculating module calculates the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage, the temperature calculating module calculates the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor, therefore, the device can accurately calculate the winding temperature of the variable frequency motor, and therefore temperature rise protection of the variable frequency motor is achieved.
In addition, the embodiment of the invention also provides a washing machine, which comprises the temperature detection device of the variable frequency motor in the washing machine.
According to the washing machine provided by the embodiment of the invention, the temperature rise protection of the variable frequency motor can be realized through the temperature detection device of the variable frequency motor in the washing machine.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (15)
1. A temperature detection method of a variable frequency motor in a washing machine is characterized by comprising the following steps:
inputting direct current to any phase winding of three-phase windings of the variable frequency motor, wherein the current is a first current value so as to position the variable frequency motor;
increasing the input direct current to a second current value, and collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a first actual current and a first actual voltage;
continuously increasing the input direct current to a third current value, and collecting the current flowing through the three-phase winding and the voltage of the three-phase winding to obtain a second actual current and a second actual voltage;
calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage;
and calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor.
2. The method of claim 1, wherein the calculating the equivalent resistance of the inverter motor based on the first actual current, the first actual voltage, the second actual current, and the second actual voltage comprises:
acquiring a voltage difference between the second actual voltage and the first actual voltage;
obtaining a current difference between the second actual current and the first actual current;
and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
3. The method for detecting a temperature of an inverter motor in a washing machine according to claim 1, further comprising:
after the first actual current and the first actual voltage are obtained, filtering the first actual current and the first actual voltage to obtain a first current filter value and a first voltage filter value;
after the second actual current and the second actual voltage are obtained, filtering the second actual current and the second actual voltage to obtain a second current filter value and a second voltage filter value;
and calculating the equivalent resistance of the variable frequency motor according to the first current filter value, the first voltage filter value, the second current filter value and the second voltage filter value.
4. The method of claim 3, wherein calculating the equivalent resistance of the inverter motor according to the first current filter value, the first voltage filter value, the second current filter value, and the second voltage filter value comprises:
acquiring a voltage difference between the second voltage filter value and the first voltage filter value;
obtaining a current difference between the second current filter value and the first current filter value; and
and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
5. The method for detecting a temperature of an inverter motor in a washing machine according to any one of claims 1 to 4, wherein a winding temperature of the inverter motor is calculated according to the following formula:
T＝k1*Req+k2
wherein T is the winding temperature of the variable frequency motor, ReqIs an equivalent resistance, k, of the inverter motor1、k2Is a constant.
6. The method for detecting a temperature of an inverter motor in a washing machine according to claim 1, further comprising:
and when the winding temperature of the variable frequency motor is greater than or equal to a third temperature threshold value, controlling the variable frequency motor to stop.
7. The method for detecting a temperature of an inverter motor in a washing machine according to claim 6, further comprising:
and when the winding temperature of the variable frequency motor is greater than or equal to a second temperature threshold and less than a third temperature threshold, reducing the washing rhythm of the washing machine until the winding temperature of the variable frequency motor is less than a first temperature threshold, wherein the first temperature threshold is less than the second temperature threshold.
8. A temperature detection device of a variable frequency motor in a washing machine is characterized by comprising:
the input module is used for sequentially inputting direct current with the current magnitude of a first current value to any phase winding of three-phase windings of the variable frequency motor, increasing the current magnitude to a second current value and then increasing the current magnitude to a third current value;
the electric acquisition module is used for acquiring the current and the voltage of the three-phase winding when the current magnitude is the second current value so as to obtain a first actual current and a first actual voltage, and acquiring the current and the voltage of the three-phase winding when the current magnitude is the third current value so as to obtain a second actual current and a second actual voltage;
the resistance value calculating module is used for calculating the equivalent resistance of the variable frequency motor according to the first actual current, the first actual voltage, the second actual current and the second actual voltage;
and the temperature calculation module is used for calculating the winding temperature of the variable frequency motor according to the equivalent resistance of the variable frequency motor.
9. The temperature sensing device of an inverter motor in a washing machine according to claim 8, wherein the resistance value calculating module calculates the equivalent resistance of the inverter motor in a manner of:
and acquiring a voltage difference between the second actual voltage and the first actual voltage, acquiring a current difference between the second actual current and the first actual current, and taking a ratio of the voltage difference to the current difference as an equivalent resistance of the variable frequency motor.
10. The temperature sensing apparatus of an inverter motor in a washing machine according to claim 8, wherein the resistance value calculating module further comprises:
the filtering unit is used for filtering the first actual current and the first actual voltage acquired by the electricity acquisition module to obtain a first current filtering value and a first voltage filtering value; filtering the collected second actual current and second actual voltage to obtain a second current filter value and a second voltage filter value;
and the resistance value calculation module calculates the equivalent resistance of the variable frequency motor according to the first current filter value, the first voltage filter value, the second current filter value and the second voltage filter value.
11. The temperature sensing device of an inverter motor in a washing machine according to claim 9, wherein the resistance value calculating module calculates the equivalent resistance of the inverter motor as follows:
and acquiring a voltage difference between the second voltage filter value and the first voltage filter value, acquiring a current difference between the second current filter value and the first current filter value, and taking the ratio of the voltage difference to the current difference as the equivalent resistance of the variable frequency motor.
12. The temperature sensing device of an inverter motor in a washing machine according to any one of claims 8 to 11, wherein the temperature calculation module calculates the winding temperature of the inverter motor according to the following formula:
T＝k1*Req+k2
wherein T is the winding temperature of the variable frequency motor, ReqIs an equivalent resistance, k, of the inverter motor1、k2Is a constant.
13. The temperature sensing apparatus of an inverter motor in a washing machine according to claim 8, further comprising:
and the control module is used for controlling the variable frequency motor to stop when the winding temperature of the variable frequency motor is greater than or equal to a third temperature threshold value.
14. The apparatus of claim 9, wherein the control module is further configured to reduce the washing cycle of the washing machine until the winding temperature of the inverter motor is less than a first temperature threshold when the winding temperature of the inverter motor is greater than or equal to a second temperature threshold and less than a third temperature threshold, wherein the first temperature threshold is less than the second temperature threshold.
15. A washing machine characterized by comprising the temperature detection apparatus of the inverter motor in the washing machine according to any one of claims 8 to 14.
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