CN113541102B - Method and system for reconstructing phase voltage of permanent magnet synchronous motor - Google Patents
Method and system for reconstructing phase voltage of permanent magnet synchronous motor Download PDFInfo
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- CN113541102B CN113541102B CN202110703074.1A CN202110703074A CN113541102B CN 113541102 B CN113541102 B CN 113541102B CN 202110703074 A CN202110703074 A CN 202110703074A CN 113541102 B CN113541102 B CN 113541102B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to the technical field of bearing test, and discloses a method and a system for reconstructing phase voltage of a permanent magnet synchronous motor, wherein the method comprises the following steps: s1: sampling bearing voltage, and obtaining a common-mode voltage of the motor through a preset first algorithm according to the sampled bearing voltage; s2: acquiring motor angle information through a position sensor, and reconstructing phase voltage according to a preset second algorithm to acquire three-phase voltage of the motor; s3: transmitting the reconstructed three-phase voltage to a motor main control chip through a filter; s4: and obtaining an overvoltage signal of the phase voltage through a preset judging flow in the motor main control chip. The method can improve the reliability of the motor control system, can detect the phase voltage of the motor without installing an additional voltage sensor, and achieves the purposes of saving space and reducing cost while protecting the driver.
Description
Technical Field
The invention relates to the technical field of bearing testing, in particular to a method and a system for reconstructing phase voltage of a permanent magnet synchronous motor.
Background
The permanent magnet synchronous motor is composed of a stator, a rotor, an end cover and other parts. The stator is laminated from laminations to reduce the iron loss generated during operation of the motor and incorporates three-phase ac windings, known as armatures. The rotor may be made in solid form or may be pressed from laminations with permanent magnet material mounted thereon. According to the different positions of the permanent magnet materials on the motor rotor, the permanent magnet synchronous motor can be divided into two structural forms of protruding type and built-in type. The armature winding can be concentrated and whole-distance winding, or distributed short-distance winding and unconventional winding. The magnetic circuit structure of the built-in rotor mainly comprises 3 types of radial type, tangential type and hybrid type, and the difference between the radial type, the tangential type and the hybrid type is mainly that the relation between the magnetization direction of the permanent magnet and the rotation direction of the rotor is different.
The permanent magnet synchronous motor is widely applied to the electronic pump of a new energy automobile due to the advantages of high power density and light weight, and the modern automobile has higher space requirement, and the purposes of saving space and reducing cost cannot be achieved by installing an additional voltage sensor to detect the phase voltage of the motor due to the limitation of space.
Disclosure of Invention
Aiming at the current state of the art, the technical problem to be solved by the invention is to provide a method and a system for reconstructing the phase voltage of a permanent magnet synchronous motor, which can detect the phase voltage of the motor without installing an additional voltage sensor in order to improve the reliability of a motor control system, realize the protection of a driver and achieve the purposes of saving space and reducing cost.
The invention discloses a method and a system for reconstructing phase voltage of a permanent magnet synchronous motor, which concretely comprise the following technical scheme:
a method for reconstructing phase voltage of a permanent magnet synchronous motor comprises the following steps:
s1: sampling bearing voltage, and obtaining a common-mode voltage of the motor through a preset first algorithm according to the sampled bearing voltage;
S2: acquiring motor angle information through a position sensor, and reconstructing phase voltage according to a preset second algorithm to acquire three-phase voltage of the motor;
S3: transmitting the reconstructed three-phase voltage to a motor main control chip through a filter;
s4: and obtaining an overvoltage signal of the phase voltage through a preset judging flow in the motor main control chip.
Further, the preset first algorithm is:
Wherein v b represents the bearing voltage; c wr denotes an equivalent capacitance between the stator winding and the rotor core; c rf represents an equivalent capacitance between the rotor core and the casing; c b,NDE and C b,DE each represent an equivalent capacitance formed by the bearing; v com denotes the common mode voltage of the motor;
the bearing voltage v b is a component of the common mode voltage v com formed by the motor.
Further, the preset second algorithm is as follows:
Wherein v an,vbn,vcn each represents a three-phase winding voltage; θ represents the motor angle.
Further, the preset judging flow is as follows:
judging whether the reconstructed three-phase voltage is greater than a threshold voltage, if so, outputting an overvoltage signal of the phase voltage; if not, ending the judging flow.
A non-transitory computer readable storage medium having stored thereon a computer program which when executed by a processor implements a method of phase voltage reconstruction of a permanent magnet synchronous motor as described.
A system for phase voltage reconstruction of a permanent magnet synchronous motor, comprising:
and a sampling module: sampling the bearing voltage;
A first calculation module: obtaining a common-mode voltage of the motor through a preset first algorithm according to the sampled bearing voltage;
The acquisition module is used for: the motor angle information acquisition module is used for acquiring motor angle information;
A second calculation module: reconstructing phase voltage according to a preset second algorithm to obtain three-phase voltage of the motor;
And a transmission module: the three-phase voltage after reconstruction is transmitted to a motor main control chip through a filter;
And a judging module: and obtaining an overvoltage signal of the phase voltage through a preset judging flow in the motor main control chip.
Further, the preset first algorithm is:
Wherein v b represents the bearing voltage; c wr denotes an equivalent capacitance between the stator winding and the rotor core; c rf represents an equivalent capacitance between the rotor core and the casing; c b,NDE and C b,DE each represent an equivalent capacitance formed by the bearing; v com denotes the common mode voltage of the motor;
the bearing voltage v b is a component of the common mode voltage v com formed by the motor.
Further, the preset second algorithm is as follows:
Wherein v an,vbn,vcn each represents a three-phase winding voltage; θ represents the motor angle.
Further, the preset judging flow is as follows:
judging whether the reconstructed three-phase voltage is greater than a threshold voltage, if so, outputting an overvoltage signal of the phase voltage; if not, ending the judging flow.
The technical scheme adopted by the invention has the following beneficial effects:
The invention detects the motor shaft voltage in real time by utilizing the contact brush, and realizes the reconstruction function of the motor phase voltage by a method for reconstructing the permanent magnet synchronous motor phase voltage, thereby realizing the protection of a driver. And detecting the performance of the motor bearing in real time according to the waveform of the motor shaft voltage, and further improving the reliability of a motor system. The purposes of saving space and reducing cost are achieved while the driver is protected.
Drawings
Fig. 1 is a flowchart of a method for reconstructing phase voltage of a permanent magnet synchronous motor according to a first embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a permanent magnet synchronous motor according to a method for reconstructing phase voltage of the permanent magnet synchronous motor according to a first embodiment of the present invention;
Fig. 3 is a cross-sectional view of a permanent magnet synchronous motor according to a method for reconstructing phase voltage of the permanent magnet synchronous motor according to a first embodiment of the present invention;
fig. 4 is an equivalent circuit diagram of bearing voltage and motor common mode voltage of a method for reconstructing phase voltage of a permanent magnet synchronous motor according to an embodiment of the present invention;
fig. 5 is a phase voltage overvoltage detection block diagram of a method for reconstructing a phase voltage of a permanent magnet synchronous motor according to an embodiment of the present invention;
fig. 6 is a system structural block diagram of phase voltage reconstruction of a permanent magnet synchronous motor according to a second embodiment of the present invention;
The corresponding component names for each reference number in the figures are: 1 is a motor winding wiring terminal, 2 is a motor shell end cover, 3 is a motor bearing, 4 is a motor shaft, 5 is a motor base, 6 is a graphite carbon brush clamp, 7 is a screw, and 8 is a signal outgoing line.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example 1
The embodiment provides a method for reconstructing phase voltage of a permanent magnet synchronous motor, as shown in fig. 1, the method comprises the following steps:
s1: sampling bearing voltage, and obtaining a common-mode voltage of the motor through a preset first algorithm according to the sampled bearing voltage;
S2: acquiring motor angle information through a position sensor, and reconstructing phase voltage according to a preset second algorithm to acquire three-phase voltage of the motor;
S3: transmitting the reconstructed three-phase voltage to a motor main control chip through a filter;
s4: and obtaining an overvoltage signal of the phase voltage through a preset judging flow in the motor main control chip.
The first algorithm is preset as follows:
Wherein v b represents the bearing voltage; c wr denotes an equivalent capacitance between the stator winding and the rotor core; c rf represents an equivalent capacitance between the rotor core and the casing; c b,NDE and C b,DE each represent an equivalent capacitance formed by the bearing; v com denotes the common mode voltage of the motor; the bearing voltage v b is a component of the common mode voltage v com formed by the motor.
The second algorithm is preset as follows:
Wherein v an,vbn,vcn each represents a three-phase winding voltage; θ represents the motor angle.
Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of a permanent magnet synchronous motor, and fig. 3 is a sectional view of the permanent magnet synchronous motor. Wherein 1 is motor winding wiring terminal, 2 is motor casing end cover, 3 is motor bearing, 4 is the motor shaft, 5 is the motor base, 6 is graphite carbon brush clamp, 7 is the screw of fixing at motor casing, 8 is signal lead-out wire. The graphite carbon brush clamp 6 has conductivity, is arranged on the motor shaft 4 and cannot be contacted with the motor shell, the screw 7 is required to be fixed on the motor shell, two signal outgoing lines 8 are required, one is connected to the graphite carbon brush clamp 6, and the other is connected to the screw 7, so that the voltage to the ground on the motor shaft is detected.
Referring to fig. 4, c wr is an equivalent capacitance between the stator winding and the rotor core; c rf is the equivalent capacitance between the rotor core and the casing; c b,NDE and C b,DE are equivalent capacitances formed by the bearings. The bearing voltage v b is a component of the common-mode voltage v com formed by the motor, so by detecting v b, the common-mode voltage v com of the motor can be calculated.
Specifically, the parameter of the capacitance is determined by the motor size, and according to the existing motor, one method can calculate the equivalent capacitance value through the size of the motor, and the other method is to directly provide measurement to obtain the equivalent capacitance value. According to the capacitance value, the common-mode voltage v com of the motor can be directly calculated. The motor angle θ is obtained from the position sensor, so that the three-phase winding voltage v an,vbn,vcn can be reconstructed from the motor common mode voltage v com.
Referring to fig. 5, specifically, the reconstructed three-phase voltage may be transmitted to the motor main control chip after passing through the filter, and an overvoltage signal is obtained through an internal threshold comparison, so that overvoltage protection of the phase voltage is achieved, and reliability of the motor driver is improved.
The bearing voltage signal can reflect the performance of the motor bearing, if the motor bearing is intact, the equivalent capacitance value cannot be changed, the common-mode voltage of the motor is only related to the motor phase voltage, and the phase voltage cannot be changed under the same working condition, so that the bearing voltage signal cannot be obviously changed; when the motor bearing breaks down, the equivalent capacitance value can be obviously changed, if a bearing oil film is broken down, larger bearing current can be caused, so that the detected bearing voltage signal can generate larger mutation, and the motor main control chip can judge the motor bearing by utilizing the mutation signal to identify whether the bearing breaks down or not, so that the reliability of a motor system can be further improved.
The preset judging flow is as follows: judging whether the reconstructed three-phase voltage is greater than a threshold voltage, if so, outputting an overvoltage signal of the phase voltage; if not, ending the judging flow.
The method utilizes the contact brush to detect the voltage of the motor shaft in real time, and realizes the reconstruction function of the motor phase voltage by a method of reconstructing the permanent magnet synchronous motor phase voltage, thereby realizing the protection of the driver. And detecting the performance of the motor bearing in real time according to the waveform of the motor shaft voltage, and further improving the reliability of a motor system. The purposes of saving space and reducing cost are achieved while the driver is protected.
The present invention also provides a non-transitory computer readable storage medium corresponding to the first embodiment.
The non-transitory computer readable storage medium of the embodiment of the present invention stores a computer program, wherein when the program is executed by a processor, the method for reconstructing the phase voltage of the permanent magnet synchronous motor according to the first embodiment of the present invention can be implemented.
According to the non-transitory computer-readable storage medium of the embodiment of the present invention, by executing the computer program stored therein, the drive can be protected by the phase voltage of the motor, thereby improving the reliability of the motor control system.
Example two
The embodiment provides a system for reconstructing phase voltage of a permanent magnet synchronous motor, as shown in fig. 6, the system includes:
And a sampling module: sampling the bearing voltage; a first calculation module: obtaining a common-mode voltage of the motor through a preset first algorithm according to the sampled bearing voltage; the acquisition module is used for: the motor angle information acquisition module is used for acquiring motor angle information; a second calculation module: reconstructing phase voltage according to a preset second algorithm to obtain three-phase voltage of the motor; and a transmission module: the three-phase voltage after reconstruction is transmitted to a motor main control chip through a filter; and a judging module: and obtaining an overvoltage signal of the phase voltage through a preset judging flow in the motor main control chip.
Specifically, a module is adopted to sample bearing voltage, and a first algorithm module is used for obtaining common-mode voltage of a motor; and the three-phase voltage of the motor after reconstruction is obtained by calculation through the second calculation module in combination with the motor angle information obtained by the obtaining module, the three-phase voltage after reconstruction is transmitted to the motor main control chip through the filter by the transmission module, and finally, whether the three-phase voltage after filtration is larger than the threshold voltage or not is judged by the judging module, so that an overvoltage signal of the phase voltage is obtained.
Specifically, the bearing voltage signal can reflect the performance of the motor bearing, if the motor bearing is intact, the equivalent capacitance value will not change, and the common-mode voltage of the motor is only related to the motor phase voltage, so the phase voltage will not change under the same working condition, and the bearing voltage signal will not change obviously; when the motor bearing breaks down, the equivalent capacitance value can be obviously changed, if a bearing oil film is broken down, larger bearing current can be caused, so that the detected bearing voltage signal can generate larger mutation, and the motor main control chip can judge the motor bearing by utilizing the mutation signal to identify whether the bearing breaks down or not, so that the reliability of a motor system can be further improved.
The first algorithm is preset as follows:
Wherein v b represents the bearing voltage; c wr denotes an equivalent capacitance between the stator winding and the rotor core; c rf represents an equivalent capacitance between the rotor core and the casing; c b,NDE and C b,DE each represent an equivalent capacitance formed by the bearing; v com denotes the common mode voltage of the motor;
the bearing voltage v b is a component of the common mode voltage v com formed by the motor.
The second algorithm is preset as follows:
Wherein v an,vbn,vcn each represents a three-phase winding voltage; θ represents the motor angle.
The preset judging flow is as follows:
judging whether the reconstructed three-phase voltage is greater than a threshold voltage, if so, outputting an overvoltage signal of the phase voltage; if not, ending the judging flow.
The system detects the voltage of the motor shaft in real time by utilizing the contact brush, and realizes the reconstruction function of the motor phase voltage by a method for reconstructing the phase voltage of the permanent magnet synchronous motor, thereby realizing the protection of a driver. And detecting the performance of the motor bearing in real time according to the waveform of the motor shaft voltage, and further improving the reliability of a motor system. The purposes of saving space and reducing cost are achieved while the driver is protected.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The method for reconstructing the phase voltage of the permanent magnet synchronous motor is characterized by comprising the following steps of:
s1: sampling bearing voltage, and obtaining a common-mode voltage of the motor through a preset first algorithm according to the sampled bearing voltage;
S2: acquiring motor angle information through a position sensor, and reconstructing phase voltage according to a preset second algorithm to acquire three-phase voltage of the motor;
S3: transmitting the reconstructed three-phase voltage to a motor main control chip through a filter;
s4: obtaining an overvoltage signal of the phase voltage through a preset judging flow in a motor main control chip;
The preset first algorithm is as follows:
；
wherein, Representing the bearing voltage; Representing an equivalent capacitance between the stator winding and the rotor core; Representing the equivalent capacitance between the rotor core and the casing; And All represent the equivalent capacitance formed by the bearing; representing a common mode voltage of the motor;
bearing voltage Is the common-mode voltage formed by the motorComponents of (2);
the preset second algorithm is as follows:
；
；
wherein, ，，All representing three phase winding voltages; Representing the motor angle.
2. The method for reconstructing phase voltage of a permanent magnet synchronous motor according to claim 1, wherein the preset judging flow is as follows:
judging whether the reconstructed three-phase voltage is greater than a threshold voltage, if so, outputting an overvoltage signal of the phase voltage; if not, ending the judging flow.
3. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements a method of phase voltage reconstruction of a permanent magnet synchronous motor according to any of claims 1-2.
4. A system for phase voltage reconstruction of a permanent magnet synchronous motor, comprising:
and a sampling module: sampling the bearing voltage;
A first calculation module: obtaining a common-mode voltage of the motor through a preset first algorithm according to the sampled bearing voltage;
The acquisition module is used for: the motor angle information acquisition module is used for acquiring motor angle information;
A second calculation module: reconstructing phase voltage according to a preset second algorithm to obtain three-phase voltage of the motor;
And a transmission module: the three-phase voltage after reconstruction is transmitted to a motor main control chip through a filter;
and a judging module: obtaining an overvoltage signal of the phase voltage through a preset judging flow in a motor main control chip;
The preset first algorithm is as follows:
；
wherein, Representing the bearing voltage; Representing an equivalent capacitance between the stator winding and the rotor core; Representing the equivalent capacitance between the rotor core and the casing; And All represent the equivalent capacitance formed by the bearing; representing a common mode voltage of the motor;
bearing voltage Is the common-mode voltage formed by the motorComponents of (2);
the preset second algorithm is as follows:
；
；
wherein, ，，All representing three phase winding voltages; Representing the motor angle.
5. The system for reconstructing a phase voltage of a permanent magnet synchronous motor according to claim 4, wherein the preset judging procedure is as follows:
judging whether the reconstructed three-phase voltage is greater than a threshold voltage, if so, outputting an overvoltage signal of the phase voltage; if not, ending the judging flow.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873100A (en) * | 2010-06-11 | 2010-10-27 | 中国矿业大学 | Simplified Phase Voltage Reconstruction Method for Three-level Frequency Converter |
| CN106788119A (en) * | 2017-03-14 | 2017-05-31 | 河北工业大学 | A kind of permagnetic synchronous motor frequency converter and its application process |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10530239B2 (en) * | 2018-03-05 | 2020-01-07 | Regal Beloit America, Inc. | Filter systems for reducing bearing current in high-frequency motor control systems |
| CN208138089U (en) * | 2018-03-29 | 2018-11-23 | 上海大学 | A kind of controllable driven generator system of electronic sail |
| CN110112977B (en) * | 2019-06-14 | 2021-02-26 | 浙江工业大学 | A Position Sensorless Control Method Based on Phase Voltage Measurement of Permanent Magnet Synchronous Motor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873100A (en) * | 2010-06-11 | 2010-10-27 | 中国矿业大学 | Simplified Phase Voltage Reconstruction Method for Three-level Frequency Converter |
| CN106788119A (en) * | 2017-03-14 | 2017-05-31 | 河北工业大学 | A kind of permagnetic synchronous motor frequency converter and its application process |
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