CN109067266A - Brshless DC motor low speed opens phase PWM setting method - Google Patents
Brshless DC motor low speed opens phase PWM setting method Download PDFInfo
- Publication number
- CN109067266A CN109067266A CN201810918420.6A CN201810918420A CN109067266A CN 109067266 A CN109067266 A CN 109067266A CN 201810918420 A CN201810918420 A CN 201810918420A CN 109067266 A CN109067266 A CN 109067266A
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- brshless
- motor
- commutation
- phase
- low speed
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses brshless DC motor low speed to open phase PWM setting method, and the setting method is: after brshless DC motor enters Steady-state in Low Speed working condition, it is 100% that phase PWM duty cycle initial value is opened in setting；Each commutating period later will open phase PWM duty cycle and gradually successively decrease 0.1%；Record Non-commutation phase current Ia before each commutating period commutation；Record Non-commutation phase current Ib in each commutating period；The Ia is subtracted into the Ib, obtains brshless DC motor Non-commutation phase current deviation delta I；It is corresponding when using the absolute value minimum of Δ I/Ia to open phase PWM duty cycle as brshless DC motor low speed and open phase PWM setting value.
Description
Technical field
The invention belongs to brshless DC motor control field, it is related to a kind of brshless DC motor, more particularly to a kind of brushless
Direct current generator low speed opens phase PWM setting method.
Background technique
Brshless DC motor has many advantages, such as structure is simple, power density is high, control is simple.In recent years, brushless straight
Galvanic electricity machine has obtained increasingly extensive application in the industrial circles such as high-performance speed-regulating system and servo-control system.
The commutation torque ripple generated when brshless DC motor commutation, can cause motor vibrating, noise, limit such electricity
The application range of machine.By taking 120 ° of brshless DC motor conductings, three phase six state controls as an example, the brshless DC motor of low speed operation
When commutation, the current changing rate for opening phase is excessive, returns the reason is that opening mutually electricity in brshless DC motor commutation process
Stream does not add control, and this generates commutation torque ripples.So far, phase PWM is opened in brshless DC motor commutation process
The research of control technology is very few, and the present patent application technology is not yet seen in report.
Summary of the invention
The purpose of the present invention is to provide a kind of brshless DC motor low speed and opens phase PWM setting method, can weaken nothing
Brushless motor low speed commutation torque ripple.
In order to achieve the above objectives, solution of the invention is:
A kind of brshless DC motor low speed opens phase PWM setting method, includes the following steps:
Step 1: PWM modulation control is carried out to brshless DC motor, after brshless DC motor enters steady state operating conditions,
Determine that brshless DC motor opens phase in commutation process, it is 100% that the PWM duty cycle initial value for opening phase, which is arranged,；
Step 2: in each commutating period later, the phase PWM duty cycle of opening gradually is successively decreased 0.1%；
Step 3: recording in each commutating period, Non-commutation phase current Ia before commutation；
Step 4: recording in each commutating period, Non-commutation phase current Ib in commutation process；
Step 5: the Ia is subtracted the Ib, brshless DC motor Non-commutation phase current deviation delta I is obtained；
Step 6: when the absolute value minimum of Δ I/Ia, using corresponding phase PWM duty cycle of opening as brshless DC motor
Open the PWM setting value of phase.
After adopting the above scheme, the present invention can control in brshless DC motor commutation process and open phase PWM, to reach
Weaken the effect of brshless DC motor low speed commutation torque ripple.
Detailed description of the invention
Fig. 1 is the flow chart of setting method of the present invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention and beneficial effect are described in detail.
As shown in Figure 1, a kind of brshless DC motor low speed of the invention opens phase PWM setting method, include the following steps:
Step 1: carrying out PWM modulation control to brshless DC motor, brshless DC motor enters Steady-state in Low Speed working condition
Afterwards, determine that brshless DC motor opens phase in commutation process, it is 100% that the PWM duty cycle initial value for opening phase, which is arranged,；
Step 2: in each commutating period later, the phase PWM duty cycle of opening gradually is successively decreased 0.1%；
Step 3: recording in each commutating period, Non-commutation phase current Ia before commutation；
Step 4: recording in each commutating period, Non-commutation phase current Ib in commutation process；
Step 5: the Ia is subtracted the Ib, brshless DC motor Non-commutation phase current deviation delta I is obtained；
Step 6: when the absolute value minimum of Δ I/Ia, using corresponding phase PWM duty cycle of opening as brshless DC motor
Low speed opens the PWM setting value of phase.
To sum up, brshless DC motor low speed opens phase PWM setting method, in settable brshless DC motor commutation process
Phase PWM duty cycle is opened, to have the function that weaken brshless DC motor low speed commutation torque ripple.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (1)
1. a kind of brshless DC motor low speed opens phase PWM setting method, which comprises the steps of:
Step 1: carrying out PWM modulation control to brshless DC motor, after brshless DC motor enters steady state operating conditions, determine
Brshless DC motor opens phase in commutation process, and it is 100% that the PWM duty cycle initial value for opening phase, which is arranged,；
Step 2: in each commutating period later, the phase PWM duty cycle of opening gradually is successively decreased 0.1%；
Step 3: recording in each commutating period, Non-commutation phase current Ia before commutation；
Step 4: recording in each commutating period, Non-commutation phase current Ib in commutation process；
Step 5: the Ia is subtracted the Ib, brshless DC motor Non-commutation phase current deviation delta I is obtained；
Step 6: when the absolute value minimum of Δ I/Ia, to open phase PWM duty cycle open-minded as brshless DC motor using corresponding
The PWM setting value of phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918420.6A CN109067266A (en) | 2018-08-13 | 2018-08-13 | Brshless DC motor low speed opens phase PWM setting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918420.6A CN109067266A (en) | 2018-08-13 | 2018-08-13 | Brshless DC motor low speed opens phase PWM setting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109067266A true CN109067266A (en) | 2018-12-21 |
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ID=64678276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810918420.6A Withdrawn CN109067266A (en) | 2018-08-13 | 2018-08-13 | Brshless DC motor low speed opens phase PWM setting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109067266A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946221A (en) * | 2012-11-13 | 2013-02-27 | 江苏科技大学 | Device and method for shortening phase changing time of brushless direct current motor |
| CN104753410A (en) * | 2015-02-27 | 2015-07-01 | 燕山大学 | Resultant current control based brushless direct-current motor instantaneous-torque control method |
| CN106655911A (en) * | 2016-09-30 | 2017-05-10 | 天津大学 | PWM (Pulse Width Modulation) method for suppressing commutation torque ripples of brushless DC motor |
-
2018
- 2018-08-13 CN CN201810918420.6A patent/CN109067266A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946221A (en) * | 2012-11-13 | 2013-02-27 | 江苏科技大学 | Device and method for shortening phase changing time of brushless direct current motor |
| CN104753410A (en) * | 2015-02-27 | 2015-07-01 | 燕山大学 | Resultant current control based brushless direct-current motor instantaneous-torque control method |
| CN106655911A (en) * | 2016-09-30 | 2017-05-10 | 天津大学 | PWM (Pulse Width Modulation) method for suppressing commutation torque ripples of brushless DC motor |
Non-Patent Citations (1)
| Title |
|---|
| 夏鲲 等: "一种基于电流反馈的分段式PWM 控制无刷直流电机转矩波动抑制方法", 《电工技术学报》 * |
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| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181221 |
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| WW01 | Invention patent application withdrawn after publication |