CN107342720B - Motor control device and method and washing machine - Google Patents
Motor control device and method and washing machine Download PDFInfo
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- CN107342720B CN107342720B CN201710749829.5A CN201710749829A CN107342720B CN 107342720 B CN107342720 B CN 107342720B CN 201710749829 A CN201710749829 A CN 201710749829A CN 107342720 B CN107342720 B CN 107342720B
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- motor
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
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- Microelectronics & Electronic Packaging (AREA)
- Control Of Washing Machine And Dryer (AREA)
Abstract
The embodiment of the invention provides a motor control device and method and a washing machine, and belongs to the field of washing machines. The motor control device includes: the storage module is used for storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor; the temperature measuring module is used for measuring the temperature of the motor; and the control module is used for searching the input voltage and the input frequency corresponding to the temperature and the rotating speed according to the temperature of the motor and the preset rotating speed, and controlling the voltage and the frequency input to the motor according to the input voltage and the input frequency so as to drive the motor to operate according to the preset rotating speed. The technical scheme provided by the embodiment of the invention can improve the control precision of the rotating speed of the motor, thereby improving the use effect of the washing machine.
Description
Technical Field
The invention relates to the field of washing machines, in particular to a motor control device and method, and further relates to a washing machine.
Background
Motors such as variable frequency motors can generally be driven by a variable frequency and variable voltage control method (V/F control method for short). The V/F control mode changes the voltage and frequency of the driving motor proportionally based on the motor parameters and the change condition of the motor load, and further obtains corresponding torque and rotating speed. The purpose of frequency conversion and voltage transformation is to keep the magnetic flux stable and avoid the heating of the motor due to insufficient output or excessive excitation.
In the process of implementing the invention, the inventor of the present application finds that the temperature of the motor can rise to more than 100 ℃ when the motor runs in the washing machine, and the motor parameters such as the resistance and the reactance of the motor can change along with the temperature. In a conventional V/F control mode, the ratio of voltage to frequency (called pressure-frequency ratio for short) is a preset fixed value, and the change of the voltage and the frequency cannot automatically follow the motor parameters to automatically adjust, so that the control error of the rotating speed of the motor is increased when the motor runs in the washing machine, and the efficacy of the washing machine is reduced.
Disclosure of Invention
The embodiment of the invention aims to overcome the technical problems in the prior art, and provides a technical scheme capable of improving the control precision of the rotating speed of a motor, so that the use efficiency of a washing machine is improved.
In order to achieve the above object, an embodiment of the present invention provides a motor control device, including:
the storage module is used for storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor;
the temperature measuring module is used for measuring the temperature of the motor;
and the control module is used for searching the input voltage and the input frequency corresponding to the temperature and the rotating speed according to the temperature of the motor and the preset rotating speed, and controlling the voltage and the frequency input to the motor according to the input voltage and the input frequency so as to drive the motor to operate according to the preset rotating speed.
Preferably, the motor comprises a stator, end covers mounted at two ends of the stator, and a rotor coaxially arranged in the stator and supported by the end covers, and the temperature measuring module is arranged on the stator.
Preferably, the stator comprises a stator core and a stator winding wound on the stator core, and the temperature measuring module is arranged on the stator winding.
Preferably, the temperature measuring module is a thermistor.
Preferably, the control module is further configured to control the motor to stop operating when the temperature of the motor exceeds a preset value.
A second aspect of an embodiment of the present invention provides a motor control method, where the method includes:
storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor;
measuring the temperature of the motor;
and searching an input voltage and an input frequency corresponding to the temperature and the rotating speed according to the temperature and the preset rotating speed of the motor, and controlling the voltage and the frequency input to the motor according to the input voltage and the input frequency so as to drive the motor to operate according to the preset rotating speed.
Preferably, the motor comprises a stator, end covers mounted at two ends of the stator, and a rotor coaxially arranged in the stator and supported by the end covers, and the temperature of the motor is the temperature of the stator.
Preferably, the stator includes a stator core and a stator winding wound on the stator core, and the temperature of the motor is the temperature of the stator winding.
Preferably, the method further comprises:
and controlling the motor to stop running when the temperature of the motor exceeds a preset value.
A third aspect of the embodiments of the present invention provides a washing machine, including a motor and a motor control device for controlling the operation of the motor, wherein the motor control device is the motor control device according to the first aspect of the embodiments of the present invention.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the motor control device provided by the embodiment of the invention is provided with a storage module for storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor in advance. When the motor runs, for example, when the preset motor runs at a rotating speed of 400 rpm, the current running temperature of the motor is detected in real time, then the input voltage and the input frequency corresponding to the current running temperature and the preset rotating speed are searched, and then the input voltage and the input frequency are input to the motor to drive the motor to run. When the motor is controlled to operate, the influence of the motor temperature on the motor rotating speed is fully considered, and then the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency is obtained, so that when the motor in the subsequent washing machine is controlled to operate, the voltage and the frequency input to the motor are enabled to be optimal values corresponding to the temperature of the motor, the control precision of the motor rotating speed can be improved, the influence of the motor temperature change on the motor rotating speed is prevented, the effect of the washing machine is improved, and the defect that the washing machine has the reduced clothes washing capacity due to the fact that the motor rotating speed is reduced due to the fact that the motor temperature is increased is overcome.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic circuit diagram of a motor control device and motor connection provided by an embodiment of the present invention;
fig. 2 is a schematic perspective view of a motor according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a stator provided by an embodiment of the present invention.
Description of the reference numerals
1-rotor 2-stator
3-end cap 4-stator core
5-stator winding 6-thermistor
7-motor lead-out wire 8-thermistor lead-out wire
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Referring to fig. 1, a first aspect of an embodiment of the present invention provides a motor control device, including:
the storage module is used for storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor;
the temperature measuring module is used for measuring the temperature of the motor;
and the control module is used for searching the input voltage and the input frequency corresponding to the temperature and the rotating speed according to the temperature of the motor and the preset rotating speed, and controlling the voltage and the frequency input to the motor according to the input voltage and the input frequency so as to drive the motor to operate according to the preset rotating speed.
Taking a motor in a washing machine as an example, when the motor in the washing machine operates, the temperature of the motor gradually rises along with the increase of the operation time of the motor, the maximum temperature can reach more than 100 ℃, the motor parameters change along with the temperature, taking the motor parameters as the motor impedance as an example, the motor impedance becomes larger when the temperature of the motor rises, and at the moment, the input voltage and the input frequency of the motor can not be accurately controlled by continuously adjusting the input voltage and the input frequency of the motor according to the original input voltage-frequency ratio of the motor. This is because, in the existing V/F control method for the motor, the input voltage-to-frequency ratio of the motor is a preset fixed value based on a specific motor parameter, which generally refers to a motor parameter corresponding to the motor under a normal temperature condition, for example, a motor parameter corresponding to the motor at 25 ℃, and the motor parameter is generally provided by a manufacturer when the motor leaves a factory; the different motor rotating speeds correspond to input voltage and input frequency which have different values and the same ratio; when the motor is required to be controlled to operate at a certain rotating speed, the input voltage and the input frequency of the motor are controlled to change in proportion to a preset fixed value. The disadvantage is that after the temperature of the motor changes, the corresponding relation between the rotating speed of the motor and the input voltage and the input frequency of the motor changes, and the accurate control of the rotating speed of the motor cannot be realized by continuously adjusting the input voltage and the input frequency of the motor according to the original voltage-frequency ratio.
Different from the above V/F control manner in the prior art, when the motor control device provided in this embodiment controls the motor to rotate, the ratio of the input voltage to the input frequency of the motor is not a fixed value, for example, for the same motor, when the motor is at different temperatures, the ratio of the input voltage to the input frequency corresponding to the same motor rotation speed is different, and the value of the corresponding input voltage and the value of the corresponding input frequency are also different. In order to accurately control the rotation speed of the motor during operation, the present embodiment is provided with a storage module for storing the corresponding relationship among the temperature, the rotation speed, the input voltage, and the input frequency of the motor in advance. Specifically, the four variables of the temperature, the rotation speed, the input voltage and the input frequency may be stored in a look-up table in advance, when the motor is running, for example, when the preset motor is running at a rotation speed of 400 rpm, the current running temperature of the motor is detected in real time, then the input voltage and the input frequency corresponding to the current running temperature and the preset rotation speed are looked up in the look-up table, and then the input voltage and the input frequency are input to the motor to drive the motor to run. The corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency can be established based on a large amount of test data, when the motor is controlled to operate, the influence of the motor temperature on the rotating speed of the motor is fully considered, and then the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency is obtained, therefore, when the motor in the subsequent washing machine is controlled to operate, the voltage and the frequency input to the motor are enabled to be optimal values corresponding to the temperature of the motor, the control precision of the rotating speed of the motor can be improved, the influence of the change of the motor temperature on the rotating speed of the motor is prevented, the efficacy of the washing machine is improved, and the defect that the rotating speed of the motor is reduced due to the increase of the motor temperature and the washing capability.
In one embodiment, the memory module may be, for example, a ROM memory, the control module may include, for example, a microprocessor such as a single chip microcomputer and peripheral circuits thereof, and the memory module may be configured independently of the control module or integrated within the control module.
Referring to fig. 2 and 3, in a specific embodiment, the motor includes a stator 2, end caps 3 installed at both ends of the stator 2, and a rotor 1 coaxially disposed within the stator 2 and supported by the end caps 3. The stator 2 generally comprises a stator core 4 and a stator winding 5 wound on the stator core 4, the rotor 1 generally comprises a rotor core and a rotor winding wound on the rotor core, the rotor is fixed outside a rotor shaft, the rotor shaft is rotatably supported on end covers 3 at two ends of the stator 2 through bearings, and the rotor 1 and the stator 2 are mutually matched and used for converting electric energy into mechanical energy for rotating the rotor 1 under the condition of electrifying.
When the motor operates, the stator 2 is stationary, and the rotor 1 drives the impeller shaft of the washing machine to rotate, so that the temperature measuring module is preferably arranged on the stator 2 for the convenience of installation. More preferably, since the temperature change of the stator winding 5 is more significant than that of the stator core 4 when the motor is running, in order to facilitate the study of the influence of the temperature change on the rotating speed of the motor, when the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency is established, the temperature of the stator winding 5 is usually taken as the detection temperature, and the temperature measuring module is usually directly mounted on the stator winding 5 in order to measure the temperature of the stator winding 5.
The temperature measuring module can be of various specific types, in order to facilitate installation, in the embodiment, the temperature measuring module is a thermistor 6 with a small size, when the temperature measuring module is specifically applied, the thermistor 6 is connected with the control module through a thermistor outgoing line 8 and can be matched with other elements in the control module to form a voltage dividing circuit, and a temperature signal is converted into an electric signal through the voltage dividing circuit. Specifically, when the temperature of the stator winding 5 changes, the resistance value of the thermistor 6 changes correspondingly, so that different voltage values are generated in the voltage dividing circuit, the voltage value of the voltage dividing circuit is detected through the voltage detection circuit, the temperature of the stator winding 5 can be known in real time, then the input voltage and the input frequency corresponding to the temperature and the rotating speed are called along with the temperature of the stator winding 5 and the preset rotating speed of the motor, the control module is connected with the motor through a motor outgoing line 7, the called input voltage and the called input frequency are output to the motor through the motor outgoing line 7 to drive the motor to operate, and therefore the voltage and the frequency output to the motor by the control module can be optimal.
The thermistor 6 may be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor, and in this embodiment, the thermistor 6 is a negative temperature coefficient thermistor, that is, a thermistor whose resistance value decreases with an increase in temperature.
In a preferred implementation, in order to prevent the motor from being damaged due to overhigh operation temperature when the motor is in a heavy load or abnormal state, the highest temperature Ts of the operation temperature of the motor can be preset, the current operation temperature Tm of the motor is monitored in real time through the thermistor 6, the current operation temperature Tm of the motor is compared with the preset temperature Ts, and the motor is controlled to stop operating when the current operation temperature Tm of the motor exceeds the preset temperature Ts, so that the temperature of the motor is prevented from being continuously increased to cause motor burning loss, the use safety of the motor is improved, and the service life of the motor is further prolonged. Specifically, the preset maximum temperature Ts may be, for example, 80 ℃ to 90 ℃.
Based on the motor control device provided in the first aspect of the embodiments of the present invention, a second aspect of the embodiments of the present invention provides a motor control method, including:
storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor;
measuring the temperature of the motor;
and searching input voltage and input frequency corresponding to the temperature and the rotating speed according to the temperature of the motor and the preset rotating speed, and controlling the voltage and the frequency input to the motor according to the input voltage and the input frequency so as to drive the motor to operate according to the preset rotating speed.
In the motor control method provided in this embodiment, when the motor is controlled to rotate, the ratio of the input voltage to the input frequency of the motor is not a fixed value, for example, for the same motor, when the motor is at different temperatures, the ratio of the input voltage to the input frequency corresponding to the same motor rotation speed is different, and the value of the corresponding input voltage and the value of the corresponding input frequency are also different. In order to accurately control the rotation speed of the motor during operation, the present embodiment prestores the correspondence relationship among the temperature, the rotation speed, the input voltage, and the input frequency of the motor. Specifically, the four variables of the temperature, the rotation speed, the input voltage and the input frequency may be stored in a look-up table in advance, when the motor is running, for example, when the preset motor is running at a rotation speed of 400 rpm, the current running temperature of the motor is detected in real time, then the input voltage and the input frequency corresponding to the current running temperature and the preset rotation speed are looked up in the look-up table, and then the input voltage and the input frequency are input to the motor to drive the motor to run. The corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency can be established based on a large amount of test data, when the motor is controlled to operate, the influence of the motor temperature on the rotating speed of the motor is fully considered, and then the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency is obtained, therefore, when the motor in the subsequent washing machine is controlled to operate, the voltage and the frequency input to the motor are enabled to be optimal values corresponding to the temperature of the motor, the control precision of the rotating speed of the motor can be improved, the influence of the change of the motor temperature on the rotating speed of the motor is prevented, the efficacy of the washing machine is improved, and the defect that the rotating speed of the motor is reduced due to the increase of the motor temperature and the washing capability.
Referring to fig. 2 and 3, in a specific embodiment, the motor includes a stator 2, end caps 3 installed at both ends of the stator 2, and a rotor 1 coaxially disposed within the stator 2 and supported by the end caps 3. The stator 2 generally comprises a stator core 4 and a stator winding 5 wound on the stator core 4, the rotor 1 generally comprises a rotor core and a rotor winding wound on the rotor core, the rotor is fixed outside a rotor shaft, the rotor shaft is rotatably supported on end covers 3 at two ends of the stator 2 through bearings, and the rotor 1 and the stator 2 are mutually matched and used for converting electric energy into mechanical energy for rotating the rotor 1 under the condition of electrifying.
When the motor is in operation, the stator 2 is stationary, and the rotor 1 drives the impeller shaft in the washing machine to rotate, so that the temperature of the stationary stator 2 is preferably detected for the convenience of measuring the temperature of the motor. More preferably, since the temperature change of the stator winding 5 is more significant than that of the stator core 4 when the motor is operating, in order to facilitate the study of the influence of the temperature change on the motor rotation speed, the temperature of the stator winding 5 is generally taken as the detected temperature when the correspondence relationship among the temperature, the rotation speed, the input voltage, and the input frequency is established, and therefore, the temperature of the stator winding 5 is generally measured when the motor input voltage and the input frequency are determined.
In a preferred implementation, in order to prevent the motor from being damaged due to overhigh operation temperature when the motor is in a heavy load or abnormal state, the highest temperature Ts of the operation temperature of the motor can be preset, the current operation temperature Tm of the motor is monitored in real time, the current operation temperature Tm of the motor is compared with the preset temperature Ts, and the motor is controlled to stop operating when the current operation temperature Tm of the motor exceeds the preset temperature Ts, so that the temperature of the motor is prevented from being continuously increased to cause motor burning loss, the use safety of the motor is improved, and the service life of the motor is further prolonged. Specifically, the preset maximum temperature Ts may be, for example, 80 ℃ to 90 ℃.
A third aspect of an embodiment of the present invention provides a washing machine having a motor and a motor control device for controlling the operation of the motor, based on the motor control device provided in the first aspect of the embodiment of the present invention, wherein the motor control device is the motor control device according to the first aspect of the embodiment of the present invention. Because the motor control device provided by the embodiment of the invention has the beneficial effects as described above, the washing machine provided by the embodiment of the invention has better washing efficiency and longer service life.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A motor control device, characterized by comprising:
the storage module is used for storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor, and when the motor is at different temperatures, the input voltage and the input frequency corresponding to the same motor rotating speed are different;
the temperature measuring module is used for measuring the temperature of the motor;
and the control module is used for searching the input voltage and the input frequency corresponding to the temperature and the rotating speed according to the temperature of the motor and the preset rotating speed, and controlling the voltage and the frequency input to the motor according to the input voltage and the input frequency so as to drive the motor to operate according to the preset rotating speed.
2. The motor control device of claim 1, wherein the motor comprises a stator, end caps installed at both ends of the stator, and a rotor coaxially disposed in the stator and supported by the end caps, and the temperature measuring module is disposed on the stator.
3. The motor control device according to claim 2, wherein the stator includes a stator core and a stator winding wound around the stator core, and the temperature measuring module is disposed on the stator winding.
4. The motor control device according to any one of claims 1 to 3, wherein the temperature measuring module is a thermistor.
5. The motor control device of any one of claims 1-3, wherein the control module is further configured to control the motor to stop operating when the temperature of the motor exceeds a preset value.
6. A method of controlling a motor, the method comprising:
storing the corresponding relation among the temperature, the rotating speed, the input voltage and the input frequency of the motor, wherein when the motor is at different temperatures, the input voltage and the input frequency corresponding to the same motor rotating speed are different;
measuring the temperature of the motor;
and searching an input voltage and an input frequency corresponding to the temperature and the rotating speed according to the temperature and the preset rotating speed of the motor, and controlling the voltage and the frequency input to the motor according to the input voltage and the input frequency so as to drive the motor to operate according to the preset rotating speed.
7. The motor control method according to claim 6, wherein the motor includes a stator, end caps installed at both ends of the stator, and a rotor coaxially disposed within the stator and supported by the end caps, and the temperature of the motor is the temperature of the stator.
8. The motor control method according to claim 7, wherein the stator includes a stator core and a stator winding wound around the stator core, and the temperature of the motor is the temperature of the stator winding.
9. The motor control method according to any one of claims 6 to 8, characterized by further comprising:
and controlling the motor to stop running when the temperature of the motor exceeds a preset value.
10. A washing machine comprising a motor and a motor control device for controlling the operation of the motor, characterized in that the motor control device is a motor control device according to any one of claims 1-5.
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| CN201710749829.5A CN107342720B (en) | 2017-08-28 | 2017-08-28 | Motor control device and method and washing machine |
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| CN201710749829.5A CN107342720B (en) | 2017-08-28 | 2017-08-28 | Motor control device and method and washing machine |
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| CN108471271B (en) * | 2018-04-16 | 2021-03-23 | 成都极米科技股份有限公司 | Projector sliding door motor control method and control device |
| CN116111779B (en) * | 2023-04-13 | 2023-06-16 | 东莞市春草研磨科技有限公司 | Motor cooling system and control method thereof |
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| JPS58179190A (en) * | 1982-04-12 | 1983-10-20 | Toshiba Corp | Controller for induction motor |
| CA1296051C (en) * | 1985-01-31 | 1992-02-18 | Lalan G. Miller | Torque determination for control of an induction motor apparatus |
| WO2013033502A1 (en) * | 2011-08-31 | 2013-03-07 | Johnson Controls Technology Company | System and method for controlling a variable speed drive of a compressor motor |
| CN202435341U (en) * | 2012-01-05 | 2012-09-12 | 浙江艾得森电气有限公司 | Constant magnetic flux keeping device for frequency converter |
| CN102916547B (en) * | 2012-10-23 | 2015-06-10 | 浙江西子富沃德电机有限公司 | Permanent magnet synchronous motor for electric forklift |
| CN202978639U (en) * | 2012-11-08 | 2013-06-05 | 浙江西子富沃德电机有限公司 | Lifting motor for electric fork-lift truck |
| JP6143960B2 (en) * | 2014-06-16 | 2017-06-07 | 三菱電機株式会社 | AC rotating machine control device, and electric power steering system equipped with an AC rotating machine control device |
| CN104270061A (en) * | 2014-10-13 | 2015-01-07 | 哈尔滨工业大学 | Submersible motor energy-saving control method based on optimal voltage-frequency ratio control |
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