CN118137933A - Winding heating method of permanent magnet synchronous motor - Google Patents
Winding heating method of permanent magnet synchronous motor Download PDFInfo
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- CN118137933A CN118137933A CN202410355972.6A CN202410355972A CN118137933A CN 118137933 A CN118137933 A CN 118137933A CN 202410355972 A CN202410355972 A CN 202410355972A CN 118137933 A CN118137933 A CN 118137933A
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- 238000004804 winding Methods 0.000 title claims abstract description 41
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- 239000003302 ferromagnetic material Substances 0.000 claims abstract description 8
- 230000009466 transformation Effects 0.000 claims description 52
- 230000003068 static effect Effects 0.000 claims description 12
- 230000010354 integration Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The invention provides a winding heating method of a permanent magnet synchronous motor, which belongs to the technical field of motor control and comprises the following steps: a high-frequency current generating unit is arranged in the permanent magnet synchronous motor and comprises a d-axis current given module and a frequency given module; a d-axis current setting module for generating a magnitude of a d-axis current; the frequency-containing giving module gives a high-frequency angular velocity value, and generates a high-frequency angle signal through an integration link process; when the winding is required to be heated, the high-frequency current generating unit is started, and after d-axis current setting and frequency setting are respectively set, hysteresis loss and eddy current loss of the ferromagnetic material of the motor heat the winding. By adopting the scheme, the high-frequency three-phase current is introduced into the winding, so that the motor winding can be quickly heated under the extremely low temperature working condition, the motor parameter is ensured to be recovered to a normal value, and the motor can be smoothly and reliably started under the extremely low temperature working condition.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a winding heating method of a permanent magnet synchronous motor.
Background
The permanent magnet synchronous motor has high efficiency and power factor and excellent speed regulation performance, and is widely applied to various fields such as air conditioners, fans, water pumps and the like. In these fields, permanent magnet synchronous motors are limited by installation space and are affected by reliability, and a position-sensor-free vector control mode is generally adopted, and has high requirements on the accuracy of motor parameters, while under extremely low-temperature working conditions, motor resistance parameters deviate from measured values at normal temperature. If the motor is started according to the motor parameter value set at normal temperature, the motor may be failed to start, and even damaged. Therefore, in order to ensure the reliability and safety of the starting and running of the permanent magnet synchronous motor, it is necessary to heat the windings for pretreatment and then implement the starting strategy.
The prior art is divided into two main categories of heating of motor windings: the first is to add auxiliary heating or insulating means to bring the motor winding temperature into a range of operation where it can be started, but additional means add to the installation volume and cost. The second type is to continuously or intermittently supply a large current to the winding before starting, and heat the winding by using the power consumption generated by the resistance of the winding itself, but the heating mode depends on a large resistance and current, otherwise, effective winding heating cannot be implemented, and for a motor with large power, the resistance of the motor is usually small, and the large current can cause a large loss of the power module, even damage.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a winding heating method for a permanent magnet synchronous motor, which at least partially solves the problems existing in the prior art.
The embodiment of the invention provides a winding heating method of a permanent magnet synchronous motor, which comprises the following steps:
a high-frequency current generating unit is arranged in the permanent magnet synchronous motor and comprises a d-axis current given module and a frequency given module;
The d-axis current setting module is used for generating the amplitude value of d-axis current setting, and carrying out slow variation and amplitude limiting treatment on the given value by a slope link to be used as the input of the d-axis current error calculation module;
the frequency-containing giving module gives a high-frequency angular velocity value, generates a high-frequency angle signal through integrating link processing, and acts on the park transformation module and the ipark transformation module;
when the winding is required to be heated, the high-frequency current generating unit is started, and after d-axis current setting and frequency setting are respectively set, hysteresis loss and eddy current loss of the ferromagnetic material of the motor heat the winding.
According to a specific implementation of an embodiment of the disclosure, the permanent magnet synchronous motor further includes a dq-axis current control unit and a coordinate transformation unit.
According to a specific implementation manner of the embodiment of the disclosure, the dq-axis current control unit comprises a q-axis current error calculation module, which is used for obtaining a q-axis current error value as an input of a q-axis current loop by calculating a difference value between a q-axis given current and a q-axis actual feedback current.
According to a specific implementation manner of the embodiment of the disclosure, the dq-axis current control unit includes a d-axis current error calculation module, configured to obtain a d-axis current error value by calculating a difference between a d-axis given current and a d-axis actual feedback current, as an input of a d-axis current loop.
According to a specific implementation of an embodiment of the disclosure, the dq-axis current control unit includes a dq-axis current loop module for outputting a dq-axis voltage setpoint by PI or other control operations on the q-axis current error and the d-axis current error, respectively, so as to control the q-axis current and the d-axis current, respectively.
According to a specific implementation manner of the embodiment of the disclosure, the coordinate transformation unit comprises an ipark transformation module, and the transformation from the two-phase rotation coordinate system to the two-phase static coordinate system is realized, so that the dq axis voltage given value is transformed into the voltage given value under the axis and is used as the input of the SVPWM module.
According to a specific implementation manner of the embodiment of the disclosure, the coordinate transformation unit includes a clark transformation module, and the transformation from the three-phase stationary coordinate system to the two-phase stationary coordinate system is realized, so that the three-phase current becomes the two-phase shaft current, and the shaft current is used as the input of the park transformation module.
According to a specific implementation manner of the embodiment of the disclosure, the coordinate transformation unit comprises a park transformation module, and the transformation from the two-phase static coordinate system to the two-phase rotating coordinate system is realized, so that the two-phase shaft current is transformed into the two-phase dq shaft current, and the decoupling of the current is realized. The output of the module is used as the feedback value of the q-axis current error calculation module and the d-axis current error calculation module.
According to a specific implementation manner of the embodiment of the disclosure, the permanent magnet synchronous motor further comprises an SVPWM module, and modulation from two-phase output voltage to three-phase inverter switch duty ratio is achieved and output to the connected inverter module.
According to a specific implementation manner of the embodiment of the disclosure, the permanent magnet synchronous motor further comprises an inverter module, which is used for converting direct current into three-phase modulation voltage to drive the controlled object PMSM.
The winding heating method of the permanent magnet synchronous motor in the embodiment of the invention comprises the following steps: a high-frequency current generating unit is arranged in the permanent magnet synchronous motor and comprises a d-axis current given module and a frequency given module; the d-axis current setting module is used for generating the amplitude value of d-axis current setting, and carrying out slow variation and amplitude limiting treatment on the given value by a slope link to be used as the input of the d-axis current error calculation module; the frequency-containing giving module gives a high-frequency angular velocity value, generates a high-frequency angle signal through integrating link processing, and acts on the park transformation module and the ipark transformation module; when the winding is required to be heated, the high-frequency current generating unit is started, and after d-axis current setting and frequency setting are respectively set, hysteresis loss and eddy current loss of the ferromagnetic material of the motor heat the winding. According to the winding heating mode of the permanent magnet synchronous motor, high-frequency three-phase current is introduced into the winding, so that the temperature of the motor winding is quickly increased under the extremely low-temperature working condition, the motor parameter is ensured to be restored to a normal value, and the motor can be smoothly and reliably started under the extremely low-temperature working condition.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a winding heating structure of a permanent magnet synchronous motor according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present disclosure provides a winding heating method of a permanent magnet synchronous motor, including:
a high-frequency current generating unit is arranged in the permanent magnet synchronous motor and comprises a d-axis current given module and a frequency given module;
The d-axis current setting module is used for generating the amplitude value of d-axis current setting, and carrying out slow variation and amplitude limiting treatment on the given value by a slope link to be used as the input of the d-axis current error calculation module;
the frequency-containing giving module gives a high-frequency angular velocity value, generates a high-frequency angle signal through integrating link processing, and acts on the park transformation module and the ipark transformation module;
when the winding is required to be heated, the high-frequency current generating unit is started, and after d-axis current setting and frequency setting are respectively set, hysteresis loss and eddy current loss of the ferromagnetic material of the motor heat the winding.
The invention provides a winding heating mode of a permanent magnet synchronous motor, which is characterized in that a high-frequency three-phase current is introduced into a winding, the winding is heated by utilizing hysteresis loss and eddy current loss of a motor ferromagnetic material, and the invention is described in detail below with reference to the accompanying drawings:
the invention is based on FOC decoupling control of the permanent magnet synchronous motor, injects high-frequency current into the d-axis, and heats the winding through hysteresis loss and eddy current loss generated by ferromagnetic materials under the condition that the rotor of the motor is not caused to rotate.
The PMSM control system provided by the embodiment of the invention comprises:
The dq-axis current control unit comprises a q-axis current error calculation module 1, which is used for obtaining a q-axis current error value by calculating the difference value between a q-axis given current and a q-axis actual feedback current, and is used as an input of a q-axis current loop.
The dq-axis current control unit comprises a d-axis current error calculation module 3, which is used for obtaining a d-axis current error value by calculating the difference value between a d-axis given current and a d-axis actual feedback current, and is used as an input of a d-axis current loop.
The dq-axis current control unit includes a dq-axis current loop module 5 for outputting a given value of the dq-axis voltage by PI or other control operation on the q-axis current error and the d-axis current error, respectively, to thereby control the q-axis current and the d-axis current, respectively.
The coordinate transformation unit comprises an ipark transformation module 6, and realizes the transformation from a two-phase rotating coordinate system to a two-phase static coordinate system, so that the dq axis voltage given value is transformed into the voltage given value under the axis and is used as the input of an SVPWM module 7.
The coordinate transformation unit comprises clark transformation modules 10, and realizes the transformation from a three-phase static coordinate system to a two-phase static coordinate system, so that three-phase currents become two-phase shaft currents and serve as input of the park transformation module 9.
The coordinate transformation unit comprises a park transformation module 9, and realizes the transformation from a two-phase static coordinate system to a two-phase rotating coordinate system, so that the axial current of the two phases is transformed into the dq axial current of the two phases, and the decoupling of the currents is realized. The output of this module serves as feedback values for the q-axis current error calculation module 1 and the d-axis current error calculation module 3.
The SVPWM module 7 modulates the switching duty ratio of the two-phase output voltage to the three-phase inverter, and outputs the two-phase output voltage to the connected inverter module 8.
The inverter module 8 converts the direct current into three-phase modulation voltage to drive the controlled object PMSM.
The high-frequency current generating unit comprises a d-axis current setting module 2 for generating the amplitude of d-axis current setting, and a slope link is used for carrying out slow-changing and amplitude limiting treatment on the given value as the input of a d-axis current error calculating module 3.
The high-frequency current generating unit comprises a frequency giving module 4 for giving a high-frequency angular velocity value, generates a high-frequency angle signal through the processing of an integration link, and acts on a park transformation module 9 and an ipark transformation module 6.
When the winding is required to be heated, the hysteresis loss and the eddy current loss of the ferromagnetic material of the motor can heat the winding by starting the high-frequency current generating unit, namely setting the d-axis current setting and the frequency setting respectively.
The invention mainly relates to a high-frequency current generating unit, which comprises a d-axis current given module 2 and a frequency given module 4.
Advantageous effects
According to the winding heating mode of the permanent magnet synchronous motor, high-frequency three-phase current is introduced into the winding, so that the temperature of the motor winding is quickly increased under the extremely low-temperature working condition, the motor parameter is ensured to be restored to a normal value, and the motor can be smoothly and reliably started under the extremely low-temperature working condition.
According to a specific implementation of an embodiment of the disclosure, the permanent magnet synchronous motor further includes a dq-axis current control unit and a coordinate transformation unit.
According to a specific implementation manner of the embodiment of the disclosure, the dq-axis current control unit comprises a q-axis current error calculation module, which is used for obtaining a q-axis current error value as an input of a q-axis current loop by calculating a difference value between a q-axis given current and a q-axis actual feedback current.
According to a specific implementation manner of the embodiment of the disclosure, the dq-axis current control unit includes a d-axis current error calculation module, configured to obtain a d-axis current error value by calculating a difference between a d-axis given current and a d-axis actual feedback current, as an input of a d-axis current loop.
According to a specific implementation of an embodiment of the disclosure, the dq-axis current control unit includes a dq-axis current loop module for outputting a dq-axis voltage setpoint by PI or other control operations on the q-axis current error and the d-axis current error, respectively, so as to control the q-axis current and the d-axis current, respectively.
According to a specific implementation manner of the embodiment of the disclosure, the coordinate transformation unit comprises an ipark transformation module, and the transformation from the two-phase rotation coordinate system to the two-phase static coordinate system is realized, so that the dq axis voltage given value is transformed into the voltage given value under the axis and is used as the input of the SVPWM module.
According to a specific implementation manner of the embodiment of the disclosure, the coordinate transformation unit includes a clark transformation module, and the transformation from the three-phase stationary coordinate system to the two-phase stationary coordinate system is realized, so that the three-phase current becomes the two-phase shaft current, and the shaft current is used as the input of the park transformation module.
According to a specific implementation manner of the embodiment of the disclosure, the coordinate transformation unit comprises a park transformation module, and the transformation from the two-phase static coordinate system to the two-phase rotating coordinate system is realized, so that the two-phase shaft current is transformed into the two-phase dq shaft current, and the decoupling of the current is realized. The output of the module is used as the feedback value of the q-axis current error calculation module and the d-axis current error calculation module.
According to a specific implementation manner of the embodiment of the disclosure, the permanent magnet synchronous motor further comprises an SVPWM module, and modulation from two-phase output voltage to three-phase inverter switch duty ratio is achieved and output to the connected inverter module.
According to a specific implementation manner of the embodiment of the disclosure, the permanent magnet synchronous motor further comprises an inverter module, which is used for converting direct current into three-phase modulation voltage to drive the controlled object PMSM.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A winding heating method of a permanent magnet synchronous motor, comprising:
a high-frequency current generating unit is arranged in the permanent magnet synchronous motor and comprises a d-axis current given module and a frequency given module;
The d-axis current setting module is used for generating the amplitude value of d-axis current setting, and carrying out slow variation and amplitude limiting treatment on the given value by a slope link to be used as the input of the d-axis current error calculation module;
the frequency-containing giving module gives a high-frequency angular velocity value, generates a high-frequency angle signal through integrating link processing, and acts on the park transformation module and the ipark transformation module;
when the winding is required to be heated, the high-frequency current generating unit is started, and after d-axis current setting and frequency setting are respectively set, hysteresis loss and eddy current loss of the ferromagnetic material of the motor heat the winding.
2. The method according to claim 1, characterized in that:
The permanent magnet synchronous motor further comprises a dq axis current control unit and a coordinate transformation unit.
3. The method according to claim 2, characterized in that:
The dq-axis current control unit comprises a q-axis current error calculation module for obtaining a q-axis current error value by calculating the difference between a q-axis given current and a q-axis actual feedback current, and the q-axis current error value is used as an input of a q-axis current loop.
4. A method according to claim 3, characterized in that:
The dq axis current control unit comprises a d axis current error calculation module, which is used for obtaining a d axis current error value by calculating the difference value of d axis given current and d axis actual feedback current, and is used as the input of a d axis current loop.
5. The method according to claim 4, wherein:
The dq-axis current control unit includes a dq-axis current loop module 5 for outputting a given value of the dq-axis voltage by PI or other control operation on the q-axis current error and the d-axis current error, respectively, to thereby control the q-axis current and the d-axis current, respectively.
6. The method according to claim 2, characterized in that:
The coordinate transformation unit comprises an ipark transformation module, and realizes the transformation from a two-phase rotating coordinate system to a two-phase static coordinate system, so that the dq axis voltage given value is transformed into the voltage given value under the axis, and the voltage given value is used as the input of the SVPWM module.
7. The method according to claim 6, wherein:
The coordinate transformation unit comprises clark transformation modules 0, realizes the transformation from a three-phase static coordinate system to a two-phase static coordinate system, enables the three-phase current to become two-phase shaft current, and is used as the input of the park transformation module.
8. The method according to claim 7, wherein:
the coordinate transformation unit comprises a park transformation module and is used for converting a two-phase static coordinate system into a two-phase rotating coordinate system, so that the axial current of the two phases is transformed into the dq axial current of the two phases, and the decoupling of the currents is realized. The output of the module is used as the feedback value of the q-axis current error calculation module and the d-axis current error calculation module.
9. The method according to claim 7, wherein:
The permanent magnet synchronous motor further comprises an SVPWM module, modulation from two-phase output voltage to three-phase inverter switch duty ratio is achieved, and the two-phase output voltage is output to the connected inverter module.
10. The method according to claim 7, wherein:
The permanent magnet synchronous motor further comprises an inverter module which is used for converting direct current into three-phase modulation voltage and driving the controlled object PMSM.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410355972.6A CN118137933A (en) | 2024-03-27 | 2024-03-27 | Winding heating method of permanent magnet synchronous motor |
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| CN202410355972.6A CN118137933A (en) | 2024-03-27 | 2024-03-27 | Winding heating method of permanent magnet synchronous motor |
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