CN110365255B - Braking method and system of frequency converter - Google Patents
Braking method and system of frequency converter Download PDFInfo
- Publication number
- CN110365255B CN110365255B CN201910673547.0A CN201910673547A CN110365255B CN 110365255 B CN110365255 B CN 110365255B CN 201910673547 A CN201910673547 A CN 201910673547A CN 110365255 B CN110365255 B CN 110365255B
- Authority
- CN
- China
- Prior art keywords
- frequency
- motor
- frequency converter
- output
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
The invention discloses a braking method and a system of a frequency converter, wherein the method is applied to a motor speed regulating system consisting of the frequency converter and a motor, and comprises the following steps: entering a braking mode; acquiring initial output frequency Ps and output current Is of a frequency converter and initial rotating speed Vt of a motor when the motor enters a braking mode; adjusting the output frequency of the frequency converter to a target frequency Pt and keeping the target frequency Pt, wherein Pt is 0.1 multiplied by Ps; detecting the rotating speed Vm of the motor, adjusting the output frequency of the frequency converter to 0 when the Vm Is equal to 0.5 multiplied by Vt, and keeping the output current Iz by the frequency converter until the motor stops rotating, wherein the Iz Is less than or equal to 0.5 multiplied by Is. The system comprises: the device comprises an information acquisition module, a frequency adjustment module and a current adjustment module; by changing the output frequency and the output current of the frequency converter, the rotor of the motor can be braked, and meanwhile, the existing direct current braking method avoids great damage to the rotor of the motor. The invention is mainly used for a motor speed regulating system consisting of a frequency converter and a motor.
Description
Technical Field
The invention relates to the field of speed regulators, in particular to a braking method and a braking system of a frequency converter.
Background
In the existing frequency converter and motor composition system, when the motor needs to be braked, a direct current braking mode is generally adopted, the existing direct current braking method is that when the rotating speed of the motor is reduced to a certain value, direct current is introduced into stator windings of a frequency converter redirection asynchronous motor to form a static magnetic field, at the moment, the motor is in an energy consumption braking state, and a rotor rotates to cut the static magnetic field to generate braking torque, so that the motor is rapidly stopped. However, in the existing direct current braking method, large direct current is introduced into the stator winding for a long time, so that certain damage is caused to the stator winding.
Disclosure of Invention
The invention aims to provide a braking method and a braking system of a frequency converter with less damage to a stator winding.
The solution of the invention for solving the technical problem is as follows: in one aspect, a method for braking a frequency converter, which is applied to a motor speed regulation system composed of the frequency converter and a motor, includes:
step 1, entering a braking mode;
step 2, acquiring initial output frequency Ps and output current Is of a frequency converter and initial rotating speed Vt of a motor when the motor enters a braking mode;
step 3, adjusting the output frequency of the frequency converter to a target frequency Pt and keeping the output frequency Pt, wherein Pt is 0.1 multiplied by Ps;
and 4, detecting the rotating speed Vm of the motor, adjusting the output frequency of the frequency converter to 0 when the Vm Is equal to 0.5 multiplied by Vt, and keeping the output current Iz of the frequency converter until the motor stops rotating, wherein the Iz Is less than or equal to 0.5 multiplied by Is.
Further, in step 4, the current Iz satisfies: iz ═ 0.5Is | sin (t) |.
Further, the method for detecting the rotating speed Vm of the motor is to perform multiple detection and averaging.
In another aspect, a brake system for a frequency converter includes: the device comprises an information acquisition module, a frequency adjustment module and a current adjustment module;
the information acquisition module is used for comprising: obtaining initial output frequency Ps and output current Is of a frequency converter and initial rotating speed Vt of a motor when the motor enters a braking mode
The frequency adjustment module is configured to include: adjusting the output frequency of the frequency converter to a target frequency Pt and keeping the target frequency Pt, wherein Pt is 0.1 multiplied by Ps;
the current adjustment module is configured to: detecting the rotating speed Vm of the motor, adjusting the output frequency of the frequency converter to 0 when the Vm Is equal to 0.5 multiplied by Vt, and keeping the output current Iz by the frequency converter until the motor stops rotating, wherein the Iz Is less than or equal to 0.5 multiplied by Is.
Further, the current Iz adjusted by the current adjusting module satisfies: iz ═ 0.5Is | sin (t) |.
The invention has the beneficial effects that: the output frequency and the output current of the frequency converter are creatively changed, so that when the rotor of the motor can be braked, the existing direct current braking method avoids great damage to the rotor of the motor.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a flow chart of steps of a braking method;
fig. 2 is a system block diagram of the brake system.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Embodiment 1, referring to fig. 1, in one aspect, a method for braking a frequency converter, the method being applied to a motor speed regulation system formed by a frequency converter and a motor, includes:
step S100, entering a braking mode;
s200, acquiring initial output frequency Ps and output current Is of a frequency converter and initial rotating speed Vt of a motor when the motor enters a braking mode;
step 300, adjusting the output frequency of the frequency converter to a target frequency Pt and keeping the target frequency Pt, wherein Pt is 0.1 × Ps;
and S400, detecting the rotating speed Vm of the motor, adjusting the output frequency of the frequency converter to 0 when the Vm Is equal to 0.5 multiplied by Vt, and keeping the output current Iz of the frequency converter until the motor stops rotating, wherein the Iz Is less than or equal to 0.5 multiplied by Is.
Specifically, after the braking mode Is entered, the sensor of the frequency converter Is used for acquiring the initial output frequency Ps and the initial output current Is of the frequency converter, and meanwhile, the speed sensor Is used for acquiring the initial rotation speed Vt of the motor. After the data of the frequency Ps, the current Is and the rotating speed Vt are obtained, a control circuit of the frequency converter adjusts the output frequency of the frequency converter to a target frequency Pt and keeps the target frequency Pt, wherein the value of the frequency Pt Is 0.1 multiplied by Ps. By reducing the frequency, the rotating magnetic fields on the rotor and the stator winding are asynchronous, so that the rotor cuts the rotating magnetic fields to generate braking torque, and the motor is gradually decelerated. At this time, the magnetic field generated by the stator winding still rotates, and compared with a static magnetic field, the induced electromotive force generated by the rotor is smaller, so that the damage to the rotor is lower. Detecting the rotating speed Vm of the motor in real time, adjusting the output frequency of the frequency converter to 0 through a control circuit of the frequency converter when the rotating speed Vm of the motor Is reduced to 0.5 × Vt, and keeping the output current Iz until the motor stops rotating, wherein Iz Is less than or equal to 0.5 × Is, and Iz Is 0.5 × Is in the embodiment. Since the rotor speed is already low, a static magnetic field is used to ensure that the motor can be stopped quickly. At the moment, the rotating speed of the motor is low, so that the motor can be braked by adopting low output current. At this time, the rotation speed of the rotor and the generated static magnetism are not large, so that the induced electromotive force generated by the rotor is small, and the damage to the rotor is low.
The output frequency and the output current of this application creatively through changing the converter for when the rotor of motor can brake, to current direct current braking method, avoid causing great injury to the rotor of motor.
As an optimization, in step S400, the current Iz satisfies: iz ═ 0.5Is | sin (t) |. By changing the current IZ, the stator winding generates a changing magnetic field, the strength of the magnetic field is further reduced while the rotor is braked, the induced electromotive force generated by the rotor is further reduced, and the damage to the rotor is reduced.
Preferably, the method for detecting the rotating speed Vm of the motor is to average the rotating speed Vm through multiple detections. The accuracy of the detected motor rotating speed Vm is improved through a method of multiple detection and averaging.
Referring to fig. 2, in another aspect, a brake system of a frequency converter is used for executing the brake method of the frequency converter. Wherein the braking system comprises: an information acquisition module 110, a frequency adjustment module 120, and a current adjustment module 130;
the information obtaining module 110 is configured to include: obtaining initial output frequency Ps and output current Is of a frequency converter and initial rotating speed Vt of a motor when the motor enters a braking mode
The frequency adjustment module 120 is configured to include: adjusting the output frequency of the frequency converter to a target frequency Pt and keeping the target frequency Pt, wherein Pt is 0.1 multiplied by Ps;
the current adjustment module 130 is configured to: detecting the rotating speed Vm of the motor, adjusting the output frequency of the frequency converter to 0 when the Vm Is equal to 0.5 multiplied by Vt, and keeping the output current Iz by the frequency converter until the motor stops rotating, wherein the Iz Is less than or equal to 0.5 multiplied by Is.
Specifically, after entering the braking mode, the information obtaining module 110 obtains an initial output frequency Ps of the frequency converter, an initial output current Is of the frequency converter, and an initial rotation speed Vt of the motor. After the data of the frequency Ps, the current Is and the rotation speed Vt are all obtained, the frequency adjusting module 120 adjusts the output frequency of the frequency converter to the target frequency Pt and keeps the target frequency Pt, wherein the value of the frequency Pt Is 0.1 × Ps. By reducing the frequency, the rotating magnetic fields on the rotor and the stator winding are asynchronous, so that the rotor cuts the rotating magnetic fields to generate braking torque, and the motor is gradually decelerated. At this time, the magnetic field generated by the stator winding still rotates, and compared with a static magnetic field, the induced electromotive force generated by the rotor is smaller, so that the damage to the rotor is lower.
The current adjustment module 130 detects the rotation speed Vm of the motor in real time, when the rotation speed Vm of the motor Is reduced to Vm equal to 0.5 × Vt, the signal Is transmitted to the frequency adjustment module 120, the frequency adjustment module 120 adjusts the output frequency of the frequency converter to 0, and meanwhile, the current adjustment module 130 adjusts the output current of the frequency converter to keep the output current Iz until the motor stops rotating, where Iz Is equal to or less than 0.5 × Is, and Iz Is equal to 0.5 × Is in this embodiment. Since the rotor speed is already low, a static magnetic field is used to ensure that the motor can be stopped quickly. At the moment, the rotating speed of the motor is low, so that the motor can be braked by adopting low output current. At this time, the rotation speed of the rotor and the generated static magnetism are not large, so that the induced electromotive force generated by the rotor is small, and the damage to the rotor is low.
The frequency adjusting module and the current adjusting module are creatively utilized to change the output frequency and the output current of the frequency converter, so that the rotor of the motor can be braked, and the existing direct current braking method avoids great damage to the rotor of the motor.
As an optimization, the current Iz adjusted by the current adjusting module satisfies: iz ═ 0.5Is | sin (t) |.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention and its scope is defined by the claims appended hereto.
Claims (3)
1. A braking method of a frequency converter is applied to a motor speed regulating system consisting of the frequency converter and a motor, and is characterized by comprising the following steps:
step 1, entering a braking mode;
step 2, acquiring initial output frequency Ps and output current Is of a frequency converter and initial rotating speed Vt of a motor when the motor enters a braking mode;
step 3, adjusting the output frequency of the frequency converter to a target frequency Pt and keeping the output frequency Pt, wherein Pt is 0.1 multiplied by Ps;
step 4, detecting the rotating speed Vm of the motor, adjusting the output frequency of the frequency converter to 0 when Vm Is equal to 0.5 multiplied by Vt, and keeping the output current Iz by the frequency converter until the motor stops rotating, wherein the Iz Is less than or equal to 0.5 multiplied by Is;
in step 4, the current Iz satisfies: iz ═ 0.5Is | sin (t) |.
2. The method as claimed in claim 1, characterized in that the method for detecting the rotation speed Vm of the motor is a multiple detection averaging.
3. A brake system for a frequency converter, comprising: the device comprises an information acquisition module, a frequency adjustment module and a current adjustment module;
the information acquisition module is used for comprising: acquiring initial output frequency Ps and output current Is of a frequency converter and initial rotating speed Vt of a motor when the motor enters a braking mode;
the frequency adjustment module is configured to include: adjusting the output frequency of the frequency converter to a target frequency Pt and keeping the target frequency Pt, wherein Pt is 0.1 multiplied by Ps;
the current adjustment module is configured to: detecting the rotating speed Vm of the motor, adjusting the output frequency of the frequency converter to 0 when the Vm Is equal to 0.5 multiplied by Vt, and keeping the output current Iz by the frequency converter until the motor stops rotating, wherein the Iz Is less than or equal to 0.5 multiplied by Is;
the current Iz adjusted by the current adjusting module satisfies the following conditions: iz ═ 0.5Is | sin (t) |.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673547.0A CN110365255B (en) | 2019-07-24 | 2019-07-24 | Braking method and system of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910673547.0A CN110365255B (en) | 2019-07-24 | 2019-07-24 | Braking method and system of frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110365255A CN110365255A (en) | 2019-10-22 |
| CN110365255B true CN110365255B (en) | 2021-04-09 |
Family
ID=68220692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910673547.0A Active CN110365255B (en) | 2019-07-24 | 2019-07-24 | Braking method and system of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110365255B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022133887A1 (en) * | 2020-12-24 | 2022-06-30 | 深圳市英威腾电气股份有限公司 | Rapid deceleration control method and system for asynchronous motor, and device and medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013223735A1 (en) * | 2013-11-20 | 2015-05-21 | Continental Teves Ag & Co. Ohg | Method and device for operating a multiphase DC motor |
| CN106655921A (en) * | 2016-11-18 | 2017-05-10 | 深圳市道通智能航空技术有限公司 | Braking method of permanent-magnet synchronous motor and related equipment |
-
2019
- 2019-07-24 CN CN201910673547.0A patent/CN110365255B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110365255A (en) | 2019-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100970897B1 (en) | System and method for parallel control of variable frequency drives | |
| US9628017B2 (en) | Motor control device, and motor control method | |
| US10298154B2 (en) | Restart strategy for synchronous reluctance machines | |
| US10840843B2 (en) | Method of starting sensorless BLDC motor | |
| JP6831625B2 (en) | Electric motor with multiple reference frames for flux angle | |
| CN110365255B (en) | Braking method and system of frequency converter | |
| KR101221748B1 (en) | Apparatus for estimating rotor time constant of induction motor | |
| ES2655092T3 (en) | Apparatus for controlling an induction machine | |
| CN103916066A (en) | Position sensorless electric excitation synchronous motor rotor static initial position estimation method | |
| US10756601B2 (en) | Control method and control system of motor rotation speed | |
| CN108111082B (en) | IF control stall detection method and system for permanent magnet synchronous motor | |
| KR20210047629A (en) | Apparatus and method for estimating mechanical parameters of SPMSM driving system using extended sliding-mode observer | |
| EP3346603A1 (en) | System and method for controlling a motor | |
| CN103401488A (en) | Elevator door motor control method | |
| WO2009048066A1 (en) | Motor control device and magnetic pole position estimation method | |
| WO2021253782A1 (en) | Method and apparatus for controlling oil-gas pump electric motor | |
| US10727766B2 (en) | Rotation speed calculation device | |
| CN103107768A (en) | Alternating current servo motor driver control circuit | |
| JP6266578B2 (en) | System and method for rotor position determination of a permanent magnet electric machine | |
| CN113179067A (en) | High-precision operation method of sensorless embedded permanent magnet synchronous motor | |
| CN107276480B (en) | Equipment for correcting current benchmark | |
| CN104953904A (en) | Field weakening control method and device for permanent magnet synchronous motor | |
| CN109831144A (en) | Temperature protecting method, device and unmanned vehicle | |
| CN117749025B (en) | Permanent magnet synchronous motor control method with wide rotation speed self-adaptive adjustment | |
| KR102426117B1 (en) | System and method for controlling motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230918 Address after: Room 201, Building 3, No. 115 Wanjiang Xinhua Road, Wanjiang Street, Dongguan City, Guangdong Province, 523000 Patentee after: Dongguan Yongxing Mechanical and Electrical Engineering Co.,Ltd. Address before: 342700 plot 4-3, Jincheng 1st Road, Guzhang Industrial Park, Shicheng County, Ganzhou City, Jiangxi Province Patentee before: JIANGXI YINGKE ELECTRONIC TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |