CN113241989B - Method, device and processor for realizing optimal efficiency point control for shaded pole motor and computer readable storage medium thereof - Google Patents
Method, device and processor for realizing optimal efficiency point control for shaded pole motor and computer readable storage medium thereof Download PDFInfo
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- CN113241989B CN113241989B CN202110685104.0A CN202110685104A CN113241989B CN 113241989 B CN113241989 B CN 113241989B CN 202110685104 A CN202110685104 A CN 202110685104A CN 113241989 B CN113241989 B CN 113241989B
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- shaded pole
- pole 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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/0077—Characterised by the use of a particular software algorithm
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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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
- H02P27/06—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 using dc to ac converters or inverters
- H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
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- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a method for realizing optimal efficiency point control for a shaded pole motor, which comprises the following steps: the inverter generates SPWM signals, the SPWM signals are applied to two ports of the shaded pole motor, and the amplitude and the frequency of the SPWM signals are respectively and independently adjustable; and adjusting the amplitude and the frequency under different rotating speeds of the shaded pole motor, and searching a minimum current operating point. The invention also relates to a corresponding device for realizing optimal efficiency point control for the shaded pole motor, a processor and a computer readable storage medium thereof. Compared with the traditional shaded pole motor powered by a traditional power frequency power supply, the method, the device, the processor and the computer readable storage medium for realizing the optimal efficiency point control of the shaded pole motor have higher efficiency, the rotating speed can exceed the power frequency rotating speed, the slip ratio during speed regulation can be effectively controlled, the overall optimal efficiency can be ensured under different rotating speeds, and the efficiency is higher under the condition of high voltage.
Description
Technical Field
The invention relates to the field of industrial equipment, in particular to a method, a device, a processor and a computer readable storage medium for realizing optimal efficiency point control for a shaded pole motor.
Background
Shaded pole motors still have a large market share due to their simple construction and excellent reliability. With the increasing complexity of electronic components and control algorithms, shaded pole motors controlled by electronic inverters have the following advantages:
(1) the efficiency is higher than that of the traditional shaded pole motor powered by a power frequency power supply;
(2) stepless speed regulation can be realized;
(3) the rotational speed can exceed the power frequency (50Hz) rotational speed.
Also face these several problems:
(1) the slip ratio is uncontrollable during speed regulation;
(2) at different rotational speeds, it is difficult to ensure a global optimum in efficiency.
The high-voltage starting current is large, and the starting failure rate is high after the voltage is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method, a device, a processor and a computer readable storage medium for realizing optimal efficiency point control for a shaded pole motor, which have the advantages of high efficiency, convenient control and wider application range.
In order to achieve the above object, the method, apparatus, processor and computer readable storage medium for realizing optimal efficiency point control for shaded pole motor of the present invention are as follows:
the method for realizing the optimal efficiency point control for the shaded pole motor is mainly characterized by comprising the following steps of:
the inverter generates SPWM signals, the SPWM signals are applied to two ports of the shaded pole motor, and the amplitude and the frequency of the SPWM signals are respectively and independently adjustable;
and adjusting the amplitude and the frequency under different rotating speeds of the shaded pole motor, and searching a minimum current operating point.
Preferably, the adjusting the voltage amplitude specifically includes the following steps:
the voltage amplitude is adjusted by adjusting the supply voltage or by adjusting the output SPWM duty cycle.
Preferably, the adjusting the voltage amplitude further comprises the following steps:
if the duty cycle of the SPWM has been adjusted to a maximum, the voltage amplitude is adjusted by adjusting the supply voltage.
Preferably, the step of adjusting the voltage amplitude specifically includes the following processing modes:
applying rated voltage and rated frequency to a shaded pole motor, and recording the rotating speed SPD of the rated motor;
respectively increasing voltage at fixed gear under different rotating speeds of the shaded pole motor, and reducing frequency to enable the rotating speed of the motor to return to the rated motor rotating speed SPD; reducing the voltage by a fixed gear, and increasing the frequency to return the motor rotating speed to the rated motor rotating speed SPD; the power supply power is recorded and the voltage and frequency curves are plotted and tabulated for optimum efficiency.
Preferably, the different rotating speeds of the shaded pole motor are 80% of rated rotation speed, 60% of rated rotation speed and 40% of rated rotation speed respectively.
The device for realizing optimal efficiency point control for the shaded pole motor is mainly characterized by comprising the following components:
a processor configured to execute computer-executable instructions;
a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of the above-described method for optimal efficiency point control for a shaded pole motor.
The processor for realizing the optimal efficiency point control for the shaded pole motor is mainly characterized in that the processor is configured to execute computer executable instructions, and when the computer executable instructions are executed by the processor, the steps of the method for realizing the optimal efficiency point control for the shaded pole motor are realized.
The computer-readable storage medium is primarily characterized in that a computer program is stored thereon, which computer program is executable by a processor for carrying out the steps of the above-described method for achieving an optimal point of efficiency control for a shaded pole motor.
Compared with the traditional shaded pole motor powered by a traditional power frequency power supply, the method, the device, the processor and the computer readable storage medium for realizing the optimal efficiency point control of the shaded pole motor have higher efficiency, the rotating speed can exceed the power frequency rotating speed, the slip ratio during speed regulation can be effectively controlled, the overall optimal efficiency can be ensured under different rotating speeds, and the efficiency is higher under the condition of high voltage.
Drawings
Fig. 1 is a flow chart of a method of the present invention for achieving optimal efficiency point control for a shaded pole motor.
Fig. 2 is a schematic diagram of a power supply power curve of the method for realizing optimal efficiency point control for a shaded pole motor under 100% SPD according to the present invention.
Fig. 3 is a schematic diagram of a power supply power curve of the method for realizing optimal efficiency point control for a shaded pole motor under 80% SPD according to the present invention.
Fig. 4 is a schematic diagram of a power supply power curve of the method for realizing optimal efficiency point control for a shaded pole motor under 60% SPD according to the present invention.
Fig. 5 is a schematic diagram of a power supply power curve of the method for realizing optimal efficiency point control for a shaded pole motor under 40% SPD according to the present invention.
Fig. 6 is a voltage and frequency curve for optimal efficiency of the method of the present invention for achieving optimal efficiency point control for a shaded pole motor.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The method for realizing the optimal efficiency point control for the shaded pole motor comprises the following steps:
the inverter generates SPWM signals, the SPWM signals are applied to two ports of the shaded pole motor, and the amplitude and the frequency of the SPWM signals are respectively and independently adjustable;
and adjusting the amplitude and the frequency under different rotating speeds of the shaded pole motor, and searching a minimum current operating point.
As a preferred embodiment of the present invention, the adjusting the voltage amplitude specifically includes the following steps:
the voltage amplitude is adjusted by adjusting the supply voltage or by adjusting the output SPWM duty cycle.
As a preferred embodiment of the present invention, the adjusting the voltage amplitude further comprises the following steps:
if the duty cycle of the SPWM has been adjusted to a maximum, the voltage amplitude is adjusted by adjusting the supply voltage.
As a preferred embodiment of the present invention, the step of adjusting the voltage amplitude specifically includes the following processing manners:
applying rated voltage and rated frequency to a shaded pole motor, and recording the rotating speed SPD of the rated motor;
respectively increasing voltage at fixed gear under different rotating speeds of the shaded pole motor, and reducing frequency to enable the rotating speed of the motor to return to the rated motor rotating speed SPD; reducing the voltage by a fixed gear, and increasing the frequency to return the motor rotating speed to the rated motor rotating speed SPD; the power supply power is recorded and the voltage and frequency curves are plotted and tabulated for optimum efficiency.
In a preferred embodiment of the present invention, the different rotation speeds of the shaded pole motor are 80% of rated rotation speed, 60% of rated rotation speed and 40% of rated rotation speed respectively.
The device for realizing optimal efficiency point control for the shaded pole motor comprises:
a processor configured to execute computer-executable instructions;
a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of the above-described method for optimal point-of-efficiency control for a shaded pole motor.
The processor for implementing optimal efficiency point control for a shaded pole motor is configured to execute computer-executable instructions, and when the computer-executable instructions are executed by the processor, the steps of the method for implementing optimal efficiency point control for a shaded pole motor are implemented.
The computer-readable storage medium, in which a computer program is stored which is executable by a processor for carrying out the steps of the above-described method for achieving an optimal point of efficiency control for a shaded pole motor.
In an embodiment of the present invention, an spwm (sinusoidal pwm) signal is generated by an inverter and applied to both terminals of a shaded pole motor. The amplitude and frequency of the SPWM are independently adjustable.
And adjusting the amplitude and the frequency at the rated rotating speed of the shaded pole motor, 80 percent of rated rotation, 60 percent of rated rotating speed and 40 percent of rated rotating speed, and searching for a minimum current operating point. And the curves are connected.
Two methods are used for adjusting the amplitude of the voltage, namely adjusting the power supply voltage and adjusting the duty ratio of the output SPWM, and if the duty ratio of the SPWM is adjusted to the maximum, the power supply voltage can only be adjusted. The specific implementation is as follows:
rated voltage and rated frequency (50Hz) are applied to the shaded pole motor, and the rotating speed SPD of the shaded pole motor at the moment is recorded.
Under 100% SPD, the voltage is increased by 5% to be the first gear, and the frequency is reduced, so that the rotating speed of the motor returns to the SPD. The supply power is recorded. And 5% of voltage is reduced to be the first gear, and the frequency is increased, so that the rotating speed of the motor returns to the SPD. The supply power is recorded.
In the same way, the supply power is recorded at 80% SPD. The lowest point of the current is found.
Also at 60% SPD, the optimum efficiency is found.
Also at 40% SPD, the optimum efficiency is found.
Finally, the voltage and frequency curves for optimum efficiency are plotted and tabulated.
In an embodiment of the present invention, based on the customer's velocity profile, a table is looked up, and the corresponding spwm is output according to the amplitude and frequency data of the table, resulting in the tables as described in tables 1 and 2.
TABLE 1
| Voltage of | Frequency of | Rotational speed |
| 35％ | 30Hz | 400rpm |
| … | … | … |
| 55％ | 38Hz | 600rpm |
| … | … | … |
| 75％ | 47Hz | 800rpm |
| … | … | … |
| 95％ | 55Hz | 1000rpm (rated) |
TABLE 2
For a specific implementation of this embodiment, reference may be made to the relevant description in the above embodiments, which is not described herein again.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
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 specific logical functions or steps in the 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.
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 a memory and executed by a suitable instruction execution device. For example, 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, and the corresponding program may be stored in a computer readable storage medium, and when 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 separate 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.
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 do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Compared with the traditional shaded pole motor powered by a traditional power frequency power supply, the method, the device, the processor and the computer readable storage medium for realizing the optimal efficiency point control of the shaded pole motor have higher efficiency, the rotating speed can exceed the power frequency rotating speed, the slip ratio during speed regulation can be effectively controlled, the overall optimal efficiency can be ensured under different rotating speeds, and the efficiency is higher under the condition of high voltage.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (6)
1. A method for achieving optimal point-of-efficiency control for a shaded pole motor, said method comprising the steps of:
the inverter generates SPWM signals, the SPWM signals are applied to two ports of the shaded pole motor, and the amplitude and the frequency of the SPWM signals are respectively and independently adjustable;
adjusting the amplitude and frequency under different rotating speeds of the shaded pole motor, and searching a minimum current operating point;
the step of adjusting the voltage amplitude of the SPWM signal specifically comprises the following steps:
adjusting the voltage amplitude by adjusting the supply voltage or by adjusting the output SPWM duty cycle;
the step of adjusting the voltage amplitude of the SPWM signal specifically includes the following processing modes:
applying rated voltage and rated frequency to a shaded pole motor, and recording the rotating speed SPD of the rated motor;
respectively increasing voltage at fixed gears under different rotating speeds of the shaded pole motor, and reducing frequency to enable the rotating speed of the motor to return to a rated motor rotating speed SPD; reducing the voltage by a fixed gear, and increasing the frequency to return the motor rotating speed to the rated motor rotating speed SPD; the power supply power is recorded and the voltage and frequency curves are plotted and tabulated for optimum efficiency.
2. The method of claim 1 for achieving optimal efficiency point control for a shaded pole motor, wherein said adjusting the voltage magnitude further comprises the steps of:
if the duty cycle of the SPWM has been adjusted to a maximum, the voltage amplitude is adjusted by adjusting the supply voltage.
3. The method of claim 1, wherein the different speeds of the shaded pole motor are 80%, 60% and 40% of rated speed, respectively.
4. An apparatus for achieving optimal point-of-efficiency control for shaded pole motors, the apparatus comprising:
a processor configured to execute computer-executable instructions;
a memory storing one or more computer-executable instructions that, when executed by the processor, perform the steps of the method of any of claims 1 to 3 for achieving optimal point of efficiency control for a shaded pole motor.
5. A processor for achieving optimal efficiency point control for a shaded pole motor, wherein the processor is configured to execute computer executable instructions which, when executed by the processor, implement the steps of the method for achieving optimal efficiency point control for a shaded pole motor as claimed in any one of claims 1 to 3.
6. A computer-readable storage medium, having stored thereon a computer program executable by a processor for carrying out the steps of the method for optimal point of efficiency control for a shaded pole motor according to any of claims 1 to 3.
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| CN202110685104.0A CN113241989B (en) | 2021-06-21 | 2021-06-21 | Method, device and processor for realizing optimal efficiency point control for shaded pole motor and computer readable storage medium thereof |
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