CN109358288A - A kind of fault detection method of servo dynamic brake circuit - Google Patents
A kind of fault detection method of servo dynamic brake circuit Download PDFInfo
- Publication number
- CN109358288A CN109358288A CN201811540587.XA CN201811540587A CN109358288A CN 109358288 A CN109358288 A CN 109358288A CN 201811540587 A CN201811540587 A CN 201811540587A CN 109358288 A CN109358288 A CN 109358288A
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- China
- Prior art keywords
- current
- brake circuit
- point
- dynamic brake
- current sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
Abstract
The invention discloses a kind of method for diagnosing faults of servo dynamic brake circuit, the dynamic brake circuit of servo dynamic brake circuit, and wherein current sensor CT1 is mounted between point P1 and point U, and current sensor CT2 is mounted between point P2 and point V.When being closed brake switch K, U phase, V phase current are directly acquired by current sensor CT1, CT2, and W phase current is calculated, three-phase current is compared with the threshold current ith of setting, thus judges whether brake circuit occurs open circuit fault.The present invention is only adjusted the installation site of current sensor on hardware, is not required to increase additional hardware cost.The method of the present invention controls signal without dedicated detection, the detection of dynamic brake circuit is automatically performed in motor dynamics braking process, real-time is good.
Description
Technical field
The present invention relates to a kind of fault detection methods of servo motor dynamic brake circuit, belong to the inspection of servo-driver failure
Survey field.
Background technique
Motor dynamics braking circuit can effectively reduce motor dwell time, shorten stopping distance, be widely used in needing electricity
The quick stopping occasion of machine, such as industrial robot.The damage of dynamic brake circuit will cause equipment operation irregularity, it is therefore desirable to
Fault detection is carried out to dynamic brake circuit.
Chinese invention patent " motor drive with dynamic brake circuit fault detection capability " (Authorization Notice No.
For CN101483402B), discloses a kind of dynamic brake circuit and its fault detection method, the method need defeated to power transistor
Dedicated detection controls signal out, cannot achieve dynamic detection, real-time is low.
Chinese utility model patent " a kind of AC servo drive system " (Authorization Notice No. CN203675030U), provides
A kind of dynamic brake circuit of simplification, but the fault detection method of the circuit is not provided.
Summary of the invention
The present invention is in view of the defects existing in the prior art and insufficient, proposes a kind of detection side of motor dynamics braking circuit
Method controls signal without dedicated detection, the real-time detection of failure is realized in motor dynamics braking process, overcomes traditional inspection
Survey method need it is additional increase hardware cost, can not real-time detection the problem of.
A kind of method for diagnosing faults for servo dynamic brake circuit that the present invention is proposed for realization goal of the invention, step
It is as follows:
Servo dynamic brake circuit: brake switch K, braking resistor R, diode D1, diode D2, diode D3 and voltage-source type
Inverter VSC, motor M and current sensor CT1, current sensor CT2 collectively form a complete dynamic brake circuit.
Wherein current sensor CT1 is mounted between point P1 and point U, and current sensor CT2 is mounted between point P2 and point V.
Fault detection:
When motor in rotation needs dynamic brake, controller will turn off six power tube T1 ~ T6, the closure brake switch of VSC
K.Stalling current will flow through two or one in three backward diodeds of VSC power tube T1 ~ T3, by brake switch K, system
Dynamic resistance R, passes through two in diode D1 ~ D3 or one, then forms one by the three-phase windings of motor M and is closed back
Road, motor kinetic energy will be rapidly depleted by braking resistor R.Therefore, when being closed brake switch K, if motor speed is not less than
The revolving speed threshold values of settingn th, then biggish stalling current will be generated in a certain phase winding of motor, if brake circuit occurs to break
Road failure, it is impossible to generate stalling current.U phase current can be directly acquired by current sensor CT1, CT2i u, V phase currenti v,
And W phase current is calculatedi w=-(i u+i v), by the threshold current of three-phase current and settingi thIt is compared, if three-phase electricity
Stream is both less than threshold currenti th, then assert that open circuit fault occurs for brake circuit.
The method of the present invention, overcome traditional detection method need it is additional increase hardware cost, can not real-time detection the problem of.
The method of the present invention, it is only necessary to meet current sensor CT1 on hardware circuit and be mounted between point P1 and point U, electric current passes
Sensor CT2 is mounted between point P2 and point V, is not required to additionally increase hardware cost.This method in motor dynamics braking process from
Dynamic to complete detection, real-time is good, and controls signal without dedicated detection.
The method of the present invention, current sensor CT1 is mounted between point P1 and point U on hardware circuit, current sensor CT2 peace
Between point P2 and point V.It is detected for brake circuit open circuit fault, motor speed is not less thann thJust detected.Three-phase electricity
The threshold current of stream and settingi thIt is compared, if three-phase current is both less than threshold currenti th, then assert brake circuit
Open circuit fault.Threshold currenti thIt is related with the resistance value of braking resistor R, power of motor.
Detailed description of the invention
Fig. 1 is the alternating current generator dragging system topology with dynamic brake and its fault detection capability.
Fig. 2 is a kind of possible circulation path of stalling current.
Specific embodiment
Detailed design step explanation is made to the embodiment of the present invention with reference to the accompanying drawing.
As shown in Figure 1, the servo dynamic brake circuit includes: brake switch K, braking resistor R, diode D1, diode
D2, diode D3.It is collectively formed with voltage source inverter VSC, motor M and current sensor CT1, current sensor CT2
One complete dynamic brake circuit.Wherein current sensor CT1 is mounted between point P1 and point U, current sensor CT2 installation
Between point P2 and point V.
Fault detection
As shown in Fig. 2, the motor in rotation is when needing dynamic brake, controller by six power tube T1~T6 for turning off VSC, close
Close brake switch K.Stalling current passes through two or one in three backward diodeds for flowing through VSC power tube T1~T3
Brake switch K, braking resistor R pass through two in diode D1~D3 or one, then pass through the three-phase windings of motor M
A closed circuit is formed, motor kinetic energy will be rapidly depleted by braking resistor R.Therefore, when being closed brake switch K, if
Motor speed is not less than nth, then biggish stalling current will be generated in a certain phase winding of motor, if brake circuit occurs to break
Road failure, it is impossible to generate stalling current.U phase current can be directly acquired by current sensor CT1, CT2i u, V phase currenti v,
And W phase current is calculatedi w=-(i u+i v), by the threshold current i of three-phase current and settingthIt is compared, if three-phase electricity
Stream is both less than threshold currenti th, then assert that open circuit fault occurs for brake circuit.
Claims (1)
1. a kind of method for diagnosing faults of servo dynamic brake circuit, it is characterised in that:
The servo dynamic brake circuit: brake switch K, braking resistor R, diode D1, diode D2, diode D3 and voltage
Source type inverter VSC, motor M and current sensor CT1, current sensor CT2 collectively form a dynamic brake circuit；Its
Middle current sensor CT1 is mounted between point P1 and point U, and current sensor CT2 is mounted between point P2 and point V；
Fault detection:
When being closed brake switch K, U phase current iu, V phase current iv is directly acquired by current sensor CT1, CT2, and calculate
Obtain W phase current iw=- (iu+iv), three-phase current is compared with the threshold current ith of setting, if three-phase current is all
Less than threshold current ith, then assert that open circuit fault occurs for brake circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811540587.XA CN109358288A (en) | 2018-12-17 | 2018-12-17 | A kind of fault detection method of servo dynamic brake circuit |
| PCT/CN2019/086548 WO2020124936A1 (en) | 2018-12-17 | 2019-05-13 | Fault detection method for servo dynamic brake circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811540587.XA CN109358288A (en) | 2018-12-17 | 2018-12-17 | A kind of fault detection method of servo dynamic brake circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109358288A true CN109358288A (en) | 2019-02-19 |
Family
ID=65328982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811540587.XA Pending CN109358288A (en) | 2018-12-17 | 2018-12-17 | A kind of fault detection method of servo dynamic brake circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109358288A (en) |
| WO (1) | WO2020124936A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478627A (en) * | 2020-04-13 | 2020-07-31 | 珠海格力电器股份有限公司 | Servo motor dynamic braking circuit and control method thereof |
| CN111610437A (en) * | 2020-04-07 | 2020-09-01 | 武汉迈信电气技术有限公司 | Dynamic braking circuit, state detection and fault processing method based on dynamic braking circuit |
| CN111736097A (en) * | 2020-08-19 | 2020-10-02 | 季华实验室 | Brake circuit fault diagnosis circuit of servo driver |
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| CN106159905A (en) * | 2015-03-26 | 2016-11-23 | 控制技术有限公司 | The fault logic circuits of converter braking circuit, method and apparatus and converter |
| CN105006731B (en) * | 2015-07-29 | 2018-11-06 | 江苏大学 | A kind of high power xenon lamp impulse preionization powersupply system |
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- 2018-12-17 CN CN201811540587.XA patent/CN109358288A/en active Pending
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2019
- 2019-05-13 WO PCT/CN2019/086548 patent/WO2020124936A1/en active Application Filing
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| CN1041074A (en) * | 1989-08-17 | 1990-04-04 | 刘世华 | AC contact-less switch with kinetic-energy braking |
| JPH07322663A (en) * | 1994-05-25 | 1995-12-08 | Yaskawa Electric Corp | Db-circuit failure detecting method of servo controller |
| JPH0833195A (en) * | 1994-07-14 | 1996-02-02 | Yaskawa Electric Corp | Db abnormality detection method of servo motor controller |
| JP2000253687A (en) * | 1999-02-25 | 2000-09-14 | Mitsubishi Electric Corp | Servo device |
| JP2008164519A (en) * | 2006-12-28 | 2008-07-17 | Toyota Motor Corp | Method of detecting fault of switching transistor, and fault detection circuit |
| CN101078747A (en) * | 2007-06-29 | 2007-11-28 | 南京航空航天大学 | Double salient-pole motor drive power tube fault diagnosis method |
| JP2009142115A (en) * | 2007-12-10 | 2009-06-25 | Yaskawa Electric Corp | Motor controller and method for detecting failure of motor controller |
| CN101483402A (en) * | 2008-01-09 | 2009-07-15 | 发那科株式会社 | Motor drive apparatus equipped with dynamic braking circuit fault detection capability |
| CN101388642A (en) * | 2008-07-09 | 2009-03-18 | 哈尔滨工业大学 | Power-on buffering and dynamic urgent braking apparatus for AC servo system |
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| CN103901301A (en) * | 2014-03-21 | 2014-07-02 | 北京天诚同创电气有限公司 | Fault diagnosis method for frequency converter |
| CN106199419A (en) * | 2014-08-18 | 2016-12-07 | 现代摩比斯株式会社 | The amplification electric current detecting method of three phase electric machine is controlled during for brake hard occurs |
| CN105846756A (en) * | 2015-01-29 | 2016-08-10 | 发那科株式会社 | Motor drive |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610437A (en) * | 2020-04-07 | 2020-09-01 | 武汉迈信电气技术有限公司 | Dynamic braking circuit, state detection and fault processing method based on dynamic braking circuit |
| CN111478627A (en) * | 2020-04-13 | 2020-07-31 | 珠海格力电器股份有限公司 | Servo motor dynamic braking circuit and control method thereof |
| CN111478627B (en) * | 2020-04-13 | 2021-11-05 | 珠海格力电器股份有限公司 | Servo motor dynamic braking circuit and control method thereof |
| CN111736097A (en) * | 2020-08-19 | 2020-10-02 | 季华实验室 | Brake circuit fault diagnosis circuit of servo driver |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020124936A1 (en) | 2020-06-25 |
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Application publication date: 20190219 |