CN111308342A - Motor phase loss detection method - Google Patents
Motor phase loss detection method Download PDFInfo
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- CN111308342A CN111308342A CN202010140080.6A CN202010140080A CN111308342A CN 111308342 A CN111308342 A CN 111308342A CN 202010140080 A CN202010140080 A CN 202010140080A CN 111308342 A CN111308342 A CN 111308342A
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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
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
Abstract
The invention discloses a motor phase loss detection method, which is characterized by comprising the following steps: the U phase, the V phase and the W phase of the motor are respectively connected with a motor controller through lines, and corresponding current sensors are arranged on the V phase and the W phase lines of the motor; the motor phase loss detection method comprises the following steps: the method comprises the following steps: the motor controller closes the U-phase output of the motor and applies a voltage between the V-phase and the W-phase of the motor, if the current values output by the two current sensors are zero, the motor is judged to be in a phase-missing state, if the current values are not zero, the motor is normal, and the step II is carried out; step two: the motor controller applies a voltage between the U phase of the motor and the V phase and the W phase of the motor arranged in parallel, if the current values output by the two current sensors are zero, the motor is judged to be out of phase, and if the current values are not zero, the motor is normal. The motor phase loss detection method provided by the invention adopts two current sensors, only needs to use the motor controller to output voltage, and can diagnose whether the three-phase cable is loosened by judging whether the phase current of the V phase and the phase current of the W phase are zero.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor phase loss detection method.
Background
In the actual use process of the motor, the power line of a certain phase may loosen or drag, or two or three phases may loosen and fall off at the same time. If the shedding phenomenon occurs, the phase current is 0, the three-phase current is not symmetrical any more, and a circular magnetic field cannot be formed, so that the torque fluctuation of the motor is caused, and the motor cannot work normally. It is necessary to diagnose whether the three-phase cable of the motor is out of phase.
Traditional motor phase loss detection all relies on three-phase current sensor, and the controller can detect the three-phase UVW electric current of motor. The controller detects the three-phase current of the motor by applying a certain voltage to the motor end and then through the three-phase current sensor. If a certain phase current of the motor is always lower than a certain threshold value, the phase is judged to be loose.
With the advancement of technology and the desire to reduce costs, motor controllers now typically employ two current sensors. For example, only installing current sensors on the V phase and the W phase, and then calculating the U-phase current by using the characteristic that the sum of three-phase currents of the motor is zero: i isu+Iv+Iw=0、Iu=0-Iv-Iw. The two current sensors may be installed in U and V phases, or U and W phases. When any one of the V phase and the W phase falls off or loosens, the actual condition of the U phase cannot be measured by adopting a traditional method when the motor controller is provided with two current sensors because the U-phase current sensor is not arranged, and the detected U-phase current is always 0 no matter whether the U phase is in phase failure or not.
Disclosure of Invention
The invention aims to provide a motor open-phase detection method aiming at the problems in the prior art, which adopts two current sensors, only needs to use a motor controller to output voltage, and can firstly judge whether a V phase and a W phase are open-phase or not and then judge whether a U phase is open-phase or not by judging whether the V phase and the W phase are zero or not.
The invention aims to solve the problems by the following technical scheme:
a motor phase loss detection method is characterized in that: the U phase, the V phase and the W phase of the motor are respectively connected with a motor controller through lines, and corresponding current sensors are arranged on the V phase and the W phase lines of the motor; the motor phase loss detection method comprises the following steps:
the method comprises the following steps: the motor controller closes the U-phase output of the motor and applies a voltage between the V-phase and the W-phase of the motor, if the current values output by the two current sensors are zero, at least one phase of the power lines of the V-phase and the W-phase falls off or loosens, and the phase failure of the motor can be judged; if the current values output by the two current sensors are not zero, the power lines of the V phase and the W phase are normally connected, the motor is normal, and the step two is carried out;
step two: the motor controller applies a voltage between the U phase of the motor and the V phase and the W phase of the motor arranged in parallel, if the current values output by the two current sensors are zero, the power line of the U phase falls off or loosens, and the phase failure of the motor can be judged; if the current values output by the two current sensors are not zero, the power lines of the U-phase are normally connected, and the motor is normal.
The amplitude of the voltage applied by the motor controller between the V phase and the W phase of the motor in the step one is Volt_vw=In*Rs2, in the formula: volt_vwApplying a voltage amplitude value between a V phase and a W phase of the motor for the motor controller; i isnRated current for the motor; rsIs the motor stator resistance.
When the motor in the step one is in phase failure, the current value I output by the current sensor on the V-phase circuitvAnd the current value I output by the current sensor on the W-phase linewThe relationship between them is: i isv=Iw=0。
When the motor in the first step is normal, the relationship between the current value Iv output by the current sensor on the V-phase line and the current value Iw output by the current sensor on the W-phase line is as follows: i isv=-Iw=Volt_vw/(2*Rs)=In。
The V phase and the W phase of the motor in the step two are connected in parallel and then connected with the U phase of the motor in series, and the amplitude of the voltage applied by the motor controller is Volt_u_vw=In*Rs1.5, wherein: volt_u_vwThe voltage amplitude applied to the U phase of the motor and the V phase and the W phase of the motor arranged in parallel; i isnRated current for the motor; rsIs the motor stator resistance.
When the motor in the step one is in phase failure, the V phaseCurrent value I output by current sensor on linevAnd the current value I output by the current sensor on the W-phase linewThe relationship between them is: i isv=Iw=0。
When the motor in the first step is normal, the relationship between the current value Iv output by the current sensor on the V-phase line and the current value Iw output by the current sensor on the W-phase line is as follows: i isv=-Iw=Volt_vw/(1.5*Rs)=In。
Compared with the prior art, the invention has the following advantages:
the motor phase-loss detection method adopts two current sensors, only needs to use a motor controller to output voltage, and can firstly judge whether the V phase and the W phase are in phase loss or not and then judge whether the U phase is in phase loss or not by judging whether the V phase and the W phase are in phase loss or not, so that whether a three-phase cable is loosened or not is diagnosed; the detection method can realize the phase loss judgment of the motor only through two steps, is simple, convenient and quick to realize, and is suitable for popularization and use.
Drawings
FIG. 1 is a flow chart of a motor phase loss detection method of the present invention;
FIG. 2 is a schematic view of a motor controller and a motor connection structure adopted in the motor open-phase detection method of the present invention;
FIG. 3 is a schematic view of a connection structure of a motor controller and a motor adopted in a first step of the motor open-phase detection method of the present invention;
fig. 4 is a schematic view of a connection structure of a motor controller and a motor adopted in step two of the motor phase loss detection method of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1-4: a motor phase loss detection method is characterized in that a U phase, a V phase and a W phase of a motor are respectively connected with a motor controller through lines, and corresponding current sensors are arranged on the V phase and the W phase of the motor; the motor phase loss detection method comprises the following steps: the method comprises the following steps: motor controller turns off U-phase output of motorAnd applying a voltage with the amplitude of V between the V phase and the W phase of the motorolt_vw=In*RsVoltage of 2, wherein: volt_vwApplying a voltage amplitude value between a V phase and a W phase of the motor for the motor controller; i isnRated current for the motor; rsIs a motor stator resistor; if the current values output by the two current sensors are not zero: i isv=-Iw=Volt_vw/(2*Rs)=InIf the power lines of the V phase and the W phase are both normally connected, the motor is normal, and the step two is carried out; if at least one phase of the V-phase and W-phase power lines falls off or loosens, the current values output by the two current sensors are zero: i isv=Iw=0, motor phase loss; step two: the motor controller applies a voltage with the amplitude of V between the U phase of the motor and the V phase and the W phase of the motor arranged in parallelolt_u_vw=In*RsA voltage of 1.5, wherein: volt_u_vwThe voltage amplitude applied to the U phase of the motor and the V phase and the W phase of the motor arranged in parallel; if the power lines of the U-phase are all normally connected, the relationship between the current value Iv output by the current sensor on the V-phase line and the current value Iw output by the current sensor on the W-phase line is as follows: i isv=-Iw=Volt_vw/(1.5*Rs)=In(ii) a If the power line of the U phase falls off or loosens, the current value output by the two current sensors is zero: i isv=IwAnd if the phase is not less than 0, the motor is out of phase.
The motor phase-loss detection method adopts two current sensors, only needs to use a motor controller to output voltage, and can firstly judge whether the V phase and the W phase are in phase loss or not and then judge whether the U phase is in phase loss or not by judging whether the V phase and the W phase are in phase loss or not, so that whether a three-phase cable is loosened or not is diagnosed; the detection method can realize the phase loss judgment of the motor only through two steps, is simple, convenient and quick to realize, and is suitable for popularization and use.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (7)
1. A motor phase loss detection method is characterized in that: the U phase, the V phase and the W phase of the motor are respectively connected with a motor controller through lines, and corresponding current sensors are arranged on the V phase and the W phase lines of the motor; the motor phase loss detection method comprises the following steps:
the method comprises the following steps: the motor controller closes the U-phase output of the motor and applies a voltage between the V-phase and the W-phase of the motor, if the current values output by the two current sensors are zero, at least one phase of the power lines of the V-phase and the W-phase falls off or loosens, and the phase failure of the motor can be judged; if the current values output by the two current sensors are not zero, the power lines of the V phase and the W phase are normally connected, the motor is normal, and the step two is carried out;
step two: the motor controller applies a voltage between the U phase of the motor and the V phase and the W phase of the motor arranged in parallel, if the current values output by the two current sensors are zero, the power line of the U phase falls off or loosens, and the phase failure of the motor can be judged; if the current values output by the two current sensors are not zero, the power lines of the U-phase are normally connected, and the motor is normal.
2. The motor phase loss detection method according to claim 1, characterized in that: the amplitude of the voltage applied by the motor controller between the V phase and the W phase of the motor in the step one is Volt_vw=In*Rs2, in the formula: volt_vwApplying a voltage amplitude value between a V phase and a W phase of the motor for the motor controller; i isnRated current for the motor; rsIs the motor stator resistance.
3. The motor phase loss detection method according to claim 2, characterized in that: when the motor in the step one is in phase failure, the current value I output by the current sensor on the V-phase circuitvAnd the current value I output by the current sensor on the W-phase linewThe relationship between them is: i isv=Iw=0。
4. According to claimThe motor phase loss detection method according to claim 2, characterized in that: when the motor in the first step is normal, the relationship between the current value Iv output by the current sensor on the V-phase line and the current value Iw output by the current sensor on the W-phase line is as follows: i isv=-Iw=Volt_vw/(2*Rs)=In。
5. The motor phase loss detection method according to claim 1, characterized in that: the V phase and the W phase of the motor in the step two are connected in parallel and then connected with the U phase of the motor in series, and the amplitude of the voltage applied by the motor controller is Volt_u_vw=In*Rs1.5, wherein: volt_u_vwThe voltage amplitude applied to the U phase of the motor and the V phase and the W phase of the motor arranged in parallel; i isnRated current for the motor; rsIs the motor stator resistance.
6. The motor phase loss detection method according to claim 5, characterized in that: when the motor in the step one is in phase failure, the current value I output by the current sensor on the V-phase circuitvAnd the current value I output by the current sensor on the W-phase linewThe relationship between them is: i isv=Iw=0。
7. The motor phase loss detection method according to claim 5, characterized in that: when the motor in the first step is normal, the relationship between the current value Iv output by the current sensor on the V-phase line and the current value Iw output by the current sensor on the W-phase line is as follows: i isv=-Iw=Volt_vw/(1.5*Rs)=In。
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| CN202010140080.6A CN111308342A (en) | 2020-03-03 | 2020-03-03 | Motor phase loss detection method |
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| CN202010140080.6A CN111308342A (en) | 2020-03-03 | 2020-03-03 | Motor phase loss detection method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102004224A (en) * | 2009-08-31 | 2011-04-06 | 比亚迪股份有限公司 | Three-phase motor phase failure detection system and detection method thereof |
| CN103515931A (en) * | 2012-06-26 | 2014-01-15 | 比亚迪股份有限公司 | Motor open-phase detection method, motor open-phase protection method, and motor open-phase protection system |
| JP2014220957A (en) * | 2013-05-10 | 2014-11-20 | 日立アプライアンス株式会社 | Motor control device |
| CN106645995A (en) * | 2016-09-23 | 2017-05-10 | 上海新时达电气股份有限公司 | Three-phase motor open-phase detection method and system |
| CN109490646A (en) * | 2018-11-30 | 2019-03-19 | 上海大郡动力控制技术有限公司 | New-energy automobile driving motor method for detecting open phase |
| CN109696627A (en) * | 2017-10-20 | 2019-04-30 | 株洲中车时代电气股份有限公司 | A kind of motor in electric automobile three-phase power line Phase Faults method and device |
-
2020
- 2020-03-03 CN CN202010140080.6A patent/CN111308342A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004224A (en) * | 2009-08-31 | 2011-04-06 | 比亚迪股份有限公司 | Three-phase motor phase failure detection system and detection method thereof |
| CN103515931A (en) * | 2012-06-26 | 2014-01-15 | 比亚迪股份有限公司 | Motor open-phase detection method, motor open-phase protection method, and motor open-phase protection system |
| JP2014220957A (en) * | 2013-05-10 | 2014-11-20 | 日立アプライアンス株式会社 | Motor control device |
| CN106645995A (en) * | 2016-09-23 | 2017-05-10 | 上海新时达电气股份有限公司 | Three-phase motor open-phase detection method and system |
| CN109696627A (en) * | 2017-10-20 | 2019-04-30 | 株洲中车时代电气股份有限公司 | A kind of motor in electric automobile three-phase power line Phase Faults method and device |
| CN109490646A (en) * | 2018-11-30 | 2019-03-19 | 上海大郡动力控制技术有限公司 | New-energy automobile driving motor method for detecting open phase |
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Application publication date: 20200619 |