CN115313961A - Pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulation method - Google Patents

Pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulation method Download PDF

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Publication number
CN115313961A
CN115313961A CN202211076455.2A CN202211076455A CN115313961A CN 115313961 A CN115313961 A CN 115313961A CN 202211076455 A CN202211076455 A CN 202211076455A CN 115313961 A CN115313961 A CN 115313961A
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China
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variable frequency
speed
frequency motor
pole
asynchronous variable
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Chinese (zh)
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姜峰
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Xuzhou Tongyi Motor Co ltd
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Xuzhou Tongyi Motor Co ltd
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Priority to CN202211076455.2A priority Critical patent/CN115313961A/en
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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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/20—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays for pole-changing
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention relates to the technical field of variable frequency motor speed regulation, in particular to a pole-changing and variable frequency combined asynchronous variable frequency motor speed regulation method.A DSP control system controls a speed regulation control circuit to switch so that a stator winding of an asynchronous variable frequency motor is in Y connection; when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed, the DSP control system closes the variable frequency output and enables the asynchronous variable frequency motor to carry out pole-changing operation, so that the stator winding is changed from Y to YY connection; after pole changing is completed, the DSP control system starts frequency conversion output, and modifies the modulation wave frequency of PWM to keep the synchronous speed of the magnetic field unchanged at the moment before and after pole changing.

Description

Pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulation method
Technical Field
The invention relates to the technical field of variable frequency motor speed regulation, in particular to a pole-changing and variable frequency combined asynchronous variable frequency motor speed regulation method.
Background
The constant torque speed regulating range of the existing asynchronous motor variable frequency speed regulating system below the fundamental frequency is strongly restricted by the rated voltage of the motor, when the voltage rises to the rated voltage along with the rotating speed, the constant torque speed regulating reaches the limit, and the driving requirement of still keeping constant torque output under the high-speed condition cannot be met.
At present, a unit series connection type multi-level inversion technology is adopted for expanding the constant torque speed regulation range of an alternating current motor, and the method has the advantages of small harmonic pollution, high input power factor, good output waveform and low du/dt.
However, the unit series connection type multi-level inversion technology is adopted, and the windings are complicated to connect, so that the additional transformer not only consumes additional cost, but also occupies more space.
Disclosure of Invention
The invention aims to provide a speed regulating method of an asynchronous variable frequency motor combining pole changing and frequency conversion, which solves the technical problems that the additional transformer not only consumes additional cost, but also occupies more space due to the adoption of a unit series connection type multi-level inversion technology and complex winding connection.
In order to achieve the purpose, the invention provides a speed regulation method of an asynchronous variable frequency motor combining pole changing and frequency conversion, which comprises the following steps:
connecting an asynchronous variable frequency motor, a variable frequency power supply, a speed sensor, a speed regulation control circuit and a DSP control system to establish an asynchronous variable frequency motor speed regulation system;
when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor is less than the rated rotating speed, the DSP control system controls the speed regulation control circuit to switch so that the stator winding of the asynchronous variable frequency motor is in Y connection;
when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed, the DSP control system closes the variable frequency output and enables the asynchronous variable frequency motor to carry out pole-changing operation, so that a stator winding is changed from Y to YY connection;
after pole changing is finished, the DSP control system starts frequency conversion output and modifies the modulation wave frequency of PWM to keep the synchronous speed of the magnetic field unchanged at the moment before and after pole changing.
Wherein, in the step of connecting asynchronous variable frequency motor, variable frequency power supply, speed sensor, speed governing control circuit and DSP control system, establish asynchronous variable frequency motor speed governing system:
the asynchronous variable frequency motor is a multiple pole ratio pole-changing asynchronous motor connected with a stator winding YY/Y.
Wherein, in the step of connecting asynchronous variable frequency motor, variable frequency power supply, speed sensor, speed governing control circuit and DSP control system, establishing asynchronous variable frequency motor speed governing system:
the pole-changing control circuit is controlled by six switching elements, and when the first switching element, the second switching element and the third switching element are switched on, the stator winding of the asynchronous variable frequency motor is in Y connection; when the switch elements of No. four, no. five and No. six are turned on, the stator windings of the asynchronous variable frequency motor are YY-connected.
Wherein, in the step of connecting asynchronous variable frequency motor, variable frequency power supply, speed sensor, speed governing control circuit and DSP control system, establish asynchronous variable frequency motor speed governing system:
the switch element adopts a low-voltage apparatus switch or a semiconductor switch device.
When the rotating speed of the asynchronous variable frequency motor detected by the speed sensor is less than the rated rotating speed, the DSP control system controls the speed regulation control circuit to switch so that the stator winding of the asynchronous variable frequency motor is in Y connection:
after the asynchronous variable frequency motor is switched, acquiring the pole pair number and the modulation wave frequency of the asynchronous variable frequency motor before pole changing, and calculating the ratio of the pole pair number to the modulation wave frequency to be used as a first ratio.
When the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed, the DSP control system closes the variable frequency output, and enables the asynchronous variable frequency motor to perform pole-changing operation, so that the stator winding is connected from Y to YY:
and after the pole change of the asynchronous variable frequency motor is finished, acquiring the pole pair number and the modulation wave frequency of the asynchronous variable frequency motor after pole change, and calculating the ratio of the pole pair number to the modulation wave frequency to be used as a second ratio.
After pole changing is finished, the DSP control system starts frequency conversion output and modifies the modulation wave frequency of PWM to keep the synchronous speed of the magnetic field at the moment before and after pole changing unchanged:
and the DSP control system enables the synchronous speed of the magnetic field and the air gap flux density of the motor at the moment before and after pole changing to be unchanged according to the first ratio, the second ratio and the modulation wave frequency and the modulation degree of the motor voltage system correction PWM.
After pole changing is finished, the DSP control system starts frequency conversion output and modifies the modulation wave frequency of PWM to keep the synchronous speed of the magnetic field at the moment before and after pole changing unchanged:
the voltage of the motor can be calculated by the effective series turns of each phase of winding of the motor and the effective value of the induced electromotive force.
The invention relates to a pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulating method, which is characterized in that an asynchronous variable frequency motor, a variable frequency power supply, a speed sensor, a speed regulating control circuit and a DSP control system are connected to establish an asynchronous variable frequency motor speed regulating system;
when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor is less than the rated rotating speed, the DSP control system controls the speed regulation control circuit to switch so that the stator winding of the asynchronous variable frequency motor is in Y connection; when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed, the DSP control system closes the variable frequency output and enables the asynchronous variable frequency motor to carry out pole-changing operation, so that a stator winding is changed from Y to YY connection; after pole changing is finished, the DSP control system starts frequency conversion output, and modifies the modulation wave frequency of PWM to keep the synchronous speed of the magnetic field constant at the moment before and after pole changing.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a flow chart of the steps of a method for regulating the speed of an asynchronous variable frequency motor combining pole changing and frequency conversion according to the invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the embodiments described below with reference to the accompanying drawings are exemplary and intended to be illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1, fig. 1 is a flow chart illustrating steps of a method for adjusting a speed of an asynchronous variable frequency motor with a combination of pole changing and frequency conversion according to the present invention.
The invention provides a pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulation method, which comprises the following steps:
s1: connecting an asynchronous variable frequency motor, a variable frequency power supply, a speed sensor, a speed regulation control circuit and a DSP control system to establish an asynchronous variable frequency motor speed regulation system;
s2: when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor is less than the rated rotating speed, the DSP control system controls the speed regulation control circuit to switch so that the stator winding of the asynchronous variable frequency motor is in Y connection;
s3: when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed, the DSP control system closes the variable frequency output and enables the asynchronous variable frequency motor to carry out pole-changing operation, so that a stator winding is changed from Y to YY connection;
s4: after pole changing is finished, the DSP control system starts frequency conversion output and modifies the modulation wave frequency of PWM to keep the synchronous speed of the magnetic field constant at the moment before and after pole changing.
In step S1, the asynchronous variable frequency motor is a multiple pole ratio pole-changing asynchronous motor in which stator windings YY/Y are connected, the pole-changing control circuit is controlled by six switching elements, and when the first, second and third switching elements are turned on and the fourth, fifth and sixth switching elements are turned off, the stator windings of the asynchronous variable frequency motor are in Y connection; when the fourth, fifth and sixth switch elements are turned on and the first, second and third switch elements are turned off, the stator windings of the asynchronous variable frequency motor are YY-connected, and the switch elements adopt low-voltage electric switches or semiconductor switch devices.
In step S2, when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor is less than the rated rotating speed, the DSP control system controls the speed regulation control circuit to switch, so that after the stator winding of the asynchronous variable frequency motor is Y-connected, the number of pole pairs and the frequency of the modulated wave of the asynchronous variable frequency motor before pole changing are obtained, and the ratio between the number of pole pairs and the frequency of the modulated wave is calculated as the first ratio.
In step S3, when the rotation speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotation speed, the DSP control system closes the variable frequency output, and makes the asynchronous variable frequency motor perform the pole-changing operation, so that the stator winding is changed from Y to YY connection, and after the pole-changing of the asynchronous variable frequency motor is completed, obtains the pole pair number and the modulation wave frequency of the asynchronous variable frequency motor after pole-changing, and calculates the ratio between the pole pair number and the modulation wave frequency as the second ratio.
In step S4, the motor voltage can be calculated by the effective series turn number of each phase winding of the motor and the effective value of the induced electromotive force, and after pole changing is completed, the DSP control system modifies the modulation wave frequency and the modulation degree of PWM according to the first ratio, the second ratio, and the motor voltage system, so that the synchronous speed of the magnetic field and the magnetic density of the motor air gap at the moment before and after pole changing are not changed.
In this embodiment, the DSP control system controls the speed control circuit to switch, so that the stator windings of the asynchronous variable frequency motor are Y-connected; when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed, the DSP control system closes the variable frequency output and enables the asynchronous variable frequency motor to carry out pole-changing operation, so that a stator winding is changed from Y to YY connection; after pole change is completed, the DSP control system starts frequency conversion output, modifies the modulation wave frequency of PWM, and keeps the synchronous speed of the magnetic field constant at the moment before and after pole change, by the method, the whole constant-torque frequency conversion speed regulation range can be obviously enlarged, the number of power semiconductor devices of an inverter circuit is not required to be additionally increased, the whole power supply voltage is not required to be improved, only the switch element is required to be additionally increased, the total cost is lower than that of a three-level method and a unit serial multi-level method, the whole control logic is simpler, and the whole reliability is improved; if the semiconductor switch is adopted to control the pole change, the whole process is microsecond order of magnitude, no influence is caused on the dynamic performance of a speed regulation system, the speed regulation process can be processed seamlessly, and the control requirement on high dynamic performance is better met; in the whole constant-torque variable-frequency speed regulation range before and after pole changing, the power supply frequency of the motor is within the power frequency range, and the iron core loss of the asynchronous variable-frequency motor cannot be increased due to the speed increasing of the pole changing; when the asynchronous variable frequency motor changes the pole and speeds up, the motor winding is changed from Y to YY connection, so that the winding resistance and the leakage inductance value are reduced to 1/4 of those before changing the pole, the loss of the stator winding is reduced, the influence of leakage impedance voltage drop is obviously reduced, and the efficiency and the overload capacity are favorably improved.
While the above disclosure describes one or more preferred embodiments of the present invention, it is not intended to limit the scope of the claims to such embodiments, and one skilled in the art will understand that all or a portion of the processes performed in the above embodiments may be practiced without departing from the spirit and scope of the claims.

Claims (8)

1. A speed regulation method of an asynchronous variable frequency motor combining pole changing and frequency conversion is characterized by comprising the following steps:
connecting an asynchronous variable frequency motor, a variable frequency power supply, a speed sensor, a speed regulation control circuit and a DSP control system to establish an asynchronous variable frequency motor speed regulation system;
when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor is less than the rated rotating speed, the DSP control system controls the speed regulation control circuit to switch so that the stator winding of the asynchronous variable frequency motor is in Y connection;
when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed, the DSP control system closes the variable frequency output and enables the asynchronous variable frequency motor to carry out pole-changing operation, so that a stator winding is changed from Y to YY connection;
after pole changing is finished, the DSP control system starts frequency conversion output and modifies the modulation wave frequency of PWM to keep the synchronous speed of the magnetic field unchanged at the moment before and after pole changing.
2. The method for regulating the speed of the asynchronous variable frequency motor combining pole changing and frequency converting as claimed in claim 1, wherein in the step of connecting the asynchronous variable frequency motor, the variable frequency power supply, the speed sensor, the speed regulating control circuit and the DSP control system to establish the speed regulating system of the asynchronous variable frequency motor:
the asynchronous variable frequency motor is a multiple pole ratio pole-changing asynchronous motor connected with a stator winding YY/Y.
3. The method for regulating the speed of the asynchronous variable frequency motor combining pole changing and frequency converting as claimed in claim 2, wherein in the step of connecting the asynchronous variable frequency motor, the variable frequency power supply, the speed sensor, the speed regulating control circuit and the DSP control system to establish the speed regulating system of the asynchronous variable frequency motor:
the pole-changing control circuit is controlled by six switching elements, and when the first switching element, the second switching element and the third switching element are switched on, the stator winding of the asynchronous variable frequency motor is in Y connection; when the switch elements of No. four, no. five and No. six are turned on, the stator windings of the asynchronous variable frequency motor are YY-connected.
4. The method for regulating the speed of the asynchronous variable frequency motor combining pole changing and frequency converting as claimed in claim 3, wherein in the step of connecting the asynchronous variable frequency motor, the variable frequency power supply, the speed sensor, the speed regulating control circuit and the DSP control system to establish the speed regulating system of the asynchronous variable frequency motor:
the switch element adopts a low-voltage apparatus switch or a semiconductor switch device.
5. The method for regulating the speed of the asynchronous variable frequency motor combining pole changing and frequency converting as claimed in claim 4, wherein when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor is less than the rated rotating speed, the DSP control system controls the speed regulating control circuit to switch so that the stator winding of the asynchronous variable frequency motor is Y-connected:
after the asynchronous variable frequency motor is switched, acquiring the pole pair number and the modulation wave frequency of the asynchronous variable frequency motor before pole changing, and calculating the ratio of the pole pair number to the modulation wave frequency to be used as a first ratio.
6. The method for regulating the speed of the asynchronous variable frequency motor combining pole changing and frequency converting according to claim 5, wherein in the step of turning off the frequency converting output and making the asynchronous variable frequency motor perform the pole changing operation to change the stator winding from Y to YY connection when the rotating speed of the asynchronous variable frequency motor detected by the speed sensor exceeds the rated rotating speed:
and after the pole change of the asynchronous variable frequency motor is finished, acquiring the pole pair number and the modulation wave frequency of the asynchronous variable frequency motor after pole change, and calculating the ratio of the pole pair number to the modulation wave frequency to be used as a second ratio.
7. The method for regulating the speed of the asynchronous variable frequency motor combining pole changing and frequency converting as claimed in claim 6, wherein after the pole changing is completed, the DSP control system starts the frequency conversion output and modifies the modulation wave frequency of the PWM to keep the synchronous speed of the magnetic field at the moment before and after the pole changing unchanged:
and the DSP control system enables the synchronous speed of the magnetic field and the air gap flux density of the motor at the moment before and after pole changing to be unchanged according to the first ratio, the second ratio and the modulation wave frequency and the modulation degree of the motor voltage system correction PWM.
8. The method for regulating the speed of an asynchronous variable frequency motor combining pole changing and frequency converting as claimed in claim 7, wherein after pole changing is completed, said DSP control system starts frequency converting output and modifies the modulating wave frequency of PWM to keep the synchronous speed of the magnetic field before and after pole changing constant:
the voltage of the motor can be calculated by the effective series turns of each phase of winding of the motor and the effective value of the induced electromotive force.
CN202211076455.2A 2022-09-05 2022-09-05 Pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulation method Pending CN115313961A (en)

Priority Applications (1)

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CN202211076455.2A CN115313961A (en) 2022-09-05 2022-09-05 Pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211076455.2A CN115313961A (en) 2022-09-05 2022-09-05 Pole-changing and frequency-changing combined asynchronous variable frequency motor speed regulation method

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CN115313961A true CN115313961A (en) 2022-11-08

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