KR101665890B1 - Apparatus for sensing disorder of 3-phase motor - Google Patents

Apparatus for sensing disorder of 3-phase motor Download PDF

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Publication number
KR101665890B1
KR101665890B1 KR1020150172706A KR20150172706A KR101665890B1 KR 101665890 B1 KR101665890 B1 KR 101665890B1 KR 1020150172706 A KR1020150172706 A KR 1020150172706A KR 20150172706 A KR20150172706 A KR 20150172706A KR 101665890 B1 KR101665890 B1 KR 101665890B1
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KR
South Korea
Prior art keywords
phase
transistor
input
driving
voltage
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KR1020150172706A
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Korean (ko)
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엄정용
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현대오트론 주식회사
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • G01R19/15—Indicating the presence of current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R31/024—
    • G01R31/3624—
    • G01R31/3662—

Abstract

The present invention relates to an apparatus for sensing an error of a three-phase motor, and more specifically, to an apparatus for sensing an error of a three-phase motor, measuring a voltage value of a first transistor in a non-driven phase, a second transistor or an input/output node to detect grounding-short circuit, battery-short circuit or a soft part of a disconnected line. According to an embodiment of the present invention, the apparatus for sensing an error of a three-phase motor including a driven phase and a non-driven phase comprises a current measurement part, a voltage measurement part and a determination part. The current measurement part measures a direction of current flowing in the driven phase. The voltage measurement part measures a voltage value of a first transistor or a second transistor in the non-driven phase while corresponding to the direction of the current. The determination part determines whether the three-phase motor has an error based on the voltage value measured by the voltage measurement part.

Description

[0001] Apparatus for detecting three-phase motor [0002]

The present invention relates to a three-phase motor abnormality sensing device, and more particularly, to a three-phase motor abnormality sensing device for measuring a voltage value of a first transistor, a second transistor or an input / And a motor abnormality detecting device.

The three-phase motor has a long life, high energy efficiency, light weight and miniaturization, and is widely used in various industrial fields. The three-phase motor includes a rotor made of a permanent magnet and a stator having three coils, that is, a U-phase, V-phase, and W-phase coil. When current is supplied to the U-phase, V-phase and W-phase coils wound on the stator, U-phase, V-phase and W-phase coils generate magnetic fields according to the supplied currents and are driven by rotating the rotor made of permanent magnets .

Also, the three-phase motor is driven by electrical switch control. The 3-phase motor is connected to the 3-phase motor via electrical connection. If there is a problem with the connection, the 3-phase motor can not be driven normally.

Electrical wiring includes battery short, ground short, and disconnection. If the battery is short-circuited or short-circuited to ground, the controller may be damaged due to overcurrent. In the case of disconnection, control of the three-phase motor is not possible and it is necessary to diagnose it in advance.

In the case of a conventional three-phase motor abnormality sensing device, the difference between the drain and source voltages of the motor driving MOSFET is measured for short-circuit diagnosis. That is, the MOSFET itself has a resistance component. When a current flows through the MOSFET, the resistance component of the MOSFET is multiplied by the current to measure the voltage difference. The measured voltage increases in proportion to the current flowing through the MOSFET. Thereafter, when a moment when the voltage difference exceeds a predetermined value occurs, the moment is captured to judge whether or not it is short-circuited.

However, as the resistance of the MOSFET is reduced due to the development of the MOSFET manufacturing technique, the voltage difference between the ends of the MOSFET is hardly generated. Therefore, the conventional three-phase motor abnormality sensing apparatus has a problem that short-circuit diagnosis is almost impossible. In addition, the conventional three-phase motor abnormality sensing device is not capable of diagnosing disconnection, so that it is impossible to diagnose disconnection.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-phase motor abnormality sensing device for measuring voltage values of a first transistor, a second transistor or an input / output node of a non-driving phase.

It is another object of the present invention to provide a three-phase motor abnormality sensing apparatus capable of determining whether or not a short circuit is present based on the voltage value of a non-driving phase first transistor.

It is another object of the present invention to provide a three-phase motor abnormality sensing device capable of determining whether a battery is short-circuited based on the voltage value of a second transistor of a non-driving phase.

It is still another object of the present invention to provide a three-phase motor abnormality sensing device capable of determining whether or not disconnection occurs based on input / output node voltage values of non-driving phases.

It is still another object of the present invention to provide a three-phase motor abnormality sensing device for measuring a voltage value of a first load resistance or a second load resistance of an nontarget phase.

It is another object of the present invention to provide a three-phase motor abnormality detection device capable of judging whether or not a ground short circuit is present based on the voltage value of the first load resistance of the non-driven phase.

It is another object of the present invention to provide a three-phase motor abnormality detecting device capable of judging whether or not a battery is short-circuited based on the resistance value of the second load resistance of the non-driven phase.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

The three-phase motor abnormality sensing apparatus for detecting the abnormality of a three-phase motor including a driving phase and a non-driving phase includes a current measuring unit for measuring a direction of a current flowing in the driving phase, A voltage measuring unit for measuring a voltage value of the first transistor or the second transistor of the non-driving phase corresponding to a direction of a current and a determination unit for determining whether the three-phase motor is abnormal based on the voltage value measured by the voltage measuring unit And the like.

According to the present invention, the voltage value of the first transistor, the second transistor or the input / output node of the non-driving phase can be measured.

According to the present invention, it is possible to determine whether or not the ground short circuit is present based on the voltage value of the first transistor of the non-driving phase.

According to the present invention, it is possible to determine whether the battery is short-circuited based on the voltage value of the second transistor of the non-driving phase.

Further, according to the present invention, it is possible to determine whether or not the circuit is disconnected based on the input / output node voltage value of the non-driving phase.

Further, according to the present invention, the voltage value of the first load resistance or the second load resistance of the non-driven phase can be measured.

Further, according to the present invention, it is possible to judge whether or not the ground is short-circuited based on the voltage value of the first load resistance of the non-driven phase.

According to the present invention, it is possible to determine whether the battery is short-circuited based on the resistance value of the second load resistance of the non-driven phase.

1 illustrates a three-phase motor abnormality sensing apparatus according to an embodiment of the present invention.
2 is a view showing a state where a current flows in a three-phase motor according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a process of determining whether or not a short circuit is present according to an embodiment of the present invention. FIG.
4 is a diagram illustrating a process of determining whether a battery is short-circuited according to an embodiment of the present invention.
5 is a diagram illustrating a process of determining whether a wire is disconnected according to an embodiment of the present invention.
6 is a diagram illustrating a procedure for determining whether or not a short circuit is present according to another embodiment of the present invention.
FIG. 7 illustrates a process of determining whether a battery is short-circuited according to another embodiment of the present invention. FIG.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

1 is a diagram showing a three-phase motor abnormality sensing apparatus 100 according to an embodiment of the present invention. Referring to FIG. 1, a three-phase motor abnormality sensing apparatus 100 according to an embodiment of the present invention is an apparatus for sensing an abnormality of a three-phase motor including a driving phase and a non-driving phase, A voltage measuring unit 120, and a determining unit 130. [0034] The three-phase motor abnormality sensing apparatus 100 shown in FIG. 1 is according to one embodiment, and its components are not limited to the embodiment shown in FIG. 1, and some components may be added, Can be deleted.

FIG. 2 is a view showing a current flowing in a three-phase motor according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a process of determining whether or not a ground is short-circuited according to an embodiment of the present invention. FIG. 4 illustrates a process of determining whether a battery is short-circuited according to an embodiment of the present invention. FIG. 5 illustrates a process of determining whether a battery is disconnected according to an embodiment of the present invention.

6 is a diagram illustrating a process of determining whether or not a short circuit is present according to another embodiment of the present invention. FIG. 7 illustrates a process of determining whether a battery is short-circuited according to another embodiment of the present invention. Hereinafter, a three-phase motor abnormality sensing apparatus 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG.

The current measuring unit 110 can measure the direction of the current flowing on the drive. Each phase of the three-phase motor is U phase, V phase, W phase, and the driving phase is the phase of U phase, V phase, W phase of the three-phase motor. On the other hand, the non-driving phase does not participate in the driving of the U phase, the V phase, and the W phase of the three-phase motor.

Generally, in the case of three-phase motors, only two phases of U-phase, V-phase and W-phase participate in motor drive. For example, when the U-phase and V-phase participate in the motor drive and the W-phase does not participate in the motor drive, the U-phase and V-phase are driven and the W-phase is non-driven. Also, when the V-phase and W-phase participate in the motor drive and the U-phase does not participate in the motor drive, the V-phase and W-phase are driven and the U-phase is non-driven.

In one embodiment, the driving phase may include an input driving phase to which a current is input and an output driving phase to which a current is output. 2 to 4, since a current is input to the U phase and a current is output to the V phase, the U phase is the input drive phase and the V phase is the output drive phase. Each of the input driving phase and the output driving phase includes first transistors 210, 310 and 410 connected at one end to the batteries 240, 340 and 440 and at the other end to the input / output nodes 230, 330 and 430, 320 and 420 connected to the input / output nodes 230, 330 and 430 and grounded at the other terminal. The first transistors 210, 310, and 410 may be the high side FETs of the respective phases, and the second transistors 220, 320, and 420 may be the low side FETs of the respective phases.

The voltage measuring unit 120 may measure the voltage value of the first transistor or the second transistor of the non-driving phase corresponding to the direction of the current, and the determining unit 130 may determine the voltage value It is possible to judge whether or not the three-phase motor is abnormal. The determination unit 130 according to the embodiment of the present invention can increase the reliability of the determination result by determining whether the three-phase motor is abnormal based on the voltage value of the non-driving phase not participating in the motor driving.

In the abnormal state of the three-phase motor, there are a ground short circuit, a battery short circuit, and a disconnection. An example of judging whether or not the ground short circuit is detected will be described with reference to FIG. 2 and FIG. The current measuring unit 110 measures whether current flows from the first transistor 210 on the input driving side to the first transistor 310 on the output driving side in order to determine whether or not the ground shorting occurs. When a current flows from the first transistor 210 on the input driving side to the first transistor 310 on the output driving side, the voltage measuring unit 120 turns off the second transistor 420 in the non-driving phase, The first transistor 410 is turned on to measure the voltage value of the first transistor 410 in the non-driving phase. Then, the determination unit 130 determines whether or not there is a ground shortage based on the voltage value of the first transistor 410 on the non-driving phase.

More specifically, when a current flows in the direction (2) in FIG. 2, it is determined whether or not the W phase of the non-driving phase W is short-circuited. 2 indicates a direction in which current flows from the first transistor 210 on the U-phase to the V-phase first transistor 310 via the motor. The direction (2) shown in FIG. 2 is the same as the direction indicated by an arrow in FIG.

The voltage measuring unit 120 turns off the second transistor 420 of the W phase and turns on the first transistor 410 of the W phase to turn on the drain terminal of the first transistor 410 of the W phase, And the voltage across the source terminal are measured. At this time, if the both-end voltage of the drain terminal and the source terminal is equal to or greater than a preset value, the determination unit 130 can determine that the W phase input / output node 430 is grounded. The preset value may be set by the user or may be set by the three-phase motor abnormality sensing device 100. [

When the input / output node 430 of the W phase is grounded, a current flows from the battery 440 of the W phase to the input / output node 430 of the W phase via the first transistor 410 of the W phase. The current flowing through the first transistor 410 on the W phase is multiplied by the resistance value of the first transistor 410 on the W phase so that the voltage is applied to the drain terminal and the source terminal of the first transistor 410 on the W phase. If the input / output node 430 of the W phase is not grounded, no current flows to the first transistor 410 on the W phase, and therefore no voltage is applied to the drain and source terminals of the first transistor 410 on the W phase. The determination unit 130 may determine whether the W phase input / output node 430 is grounded through the above process.

According to another embodiment of the present invention, the voltage value of the first load resistance of the non-driving phase may be measured to judge whether or not the ground is short-circuited. Referring to FIG. 6, the non-driven image may further include a first load resistor 480 connected at one end to the battery 440 and at the other end to the drain terminal of the first transistor 410. The voltage measuring unit 120 measures the voltage of the first load resistor 480 and the determining unit 130 may determine whether the ground is short-circuited based on the voltage value of the first load resistor 480.

More specifically, when the W-phase input / output node 430 is grounded, a current flows from the W-phase battery 440 to the W-phase input / output node 430 via the W-phase first load resistor 480. The current flowing through the first load resistor 480 on the W phase is multiplied by the resistance value of the first load resistor 480 on the W phase so that the voltage is applied to the first load resistor 480 on the W phase. If the input / output node 430 of the W phase is not grounded, no current flows through the first load resistor 480 on the W phase, so no voltage is applied to the first load resistor 480 on the W phase. The determination unit 130 may determine whether the W phase input / output node 430 is grounded through the above process.

Next, an embodiment for determining whether or not the battery is short-circuited will be described with reference to FIGS. 2 and 4. FIG. In order to determine whether a battery is short-circuited, the current measuring unit 110 measures whether current flows from the second transistor 220 on the input driving side to the second transistor 320 on the output driving side. When a current flows from the second transistor 220 on the input driving side to the second transistor 320 on the output driving side, the voltage measuring unit 120 turns off the first transistor 410 in the non-driving phase, (420) is turned on to measure the voltage value of the second transistor (420) in the non-driving phase. Then, the determination unit 130 determines whether the battery is short-circuited based on the voltage value of the second transistor 420 in the non-driving phase.

More specifically, when a current flows in the direction of? In Fig. 2, it is determined whether or not the battery on the non-driving phase W is short-circuited. 2 indicates a direction in which a current flows from the second transistor 220 in the U phase to the second transistor 320 in the V phase via the motor. The direction of ④ shown in FIG. 2 is the same as the direction indicated by an arrow in FIG.

The voltage measuring unit 120 turns off the first transistor 410 of the W phase and turns on the second transistor 420 of the W phase so that the drain terminal of the second transistor 420 of the W phase is turned on, And the voltage across the source terminal are measured. At this time, if the voltage across the drain terminal and the source terminal is equal to or greater than a preset value, the determination unit 130 can determine that the W phase input / output node 430 is short-circuited. The preset value may be set by the user or may be set by the three-phase motor abnormality sensing device 100. [

When a battery is short-circuited by the input / output node 430 of the W phase, current flows through the W-phase input / output node 430 through the W-phase second transistor 420. The current flowing through the second transistor 420 on the W phase is multiplied by the resistance value of the second transistor 420 on the W phase so that the voltage is applied to the drain and source terminals of the second transistor 420 on the W phase. If the input / output node 430 of the W phase does not short-circuit the battery, no current flows to the second transistor 420 on the W phase, so that no voltage is applied to the drain and source terminals of the second transistor 420 on the W phase. The determination unit 130 may determine whether the W phase input / output node 430 is short-circuited through the above process.

According to another embodiment of the present invention, it is possible to determine whether the battery is short-circuited by measuring the voltage value of the second load resistor 490 in the non-driving phase. Referring to FIG. 7, the non-driven image may further include a second load resistor 490 having one end connected to the source terminal of the second transistor 420 and the other end grounded. The voltage measuring unit 120 measures the voltage of the second load resistor 490 and the determining unit 130 may determine whether the battery is short-circuited based on the voltage value of the second load resistor 490.

More specifically, when the input / output node 430 of the W phase is short-circuited to the battery, current flows through the W phase input / output node 430 through the W phase second load resistor 490. The current flowing through the second load resistor 490 on the W phase is multiplied by the resistance value of the second load resistor 490 on the W phase so that the voltage is applied to the second load resistor 490 on the W phase. If the input / output node 430 of the W phase is not grounded, no current flows through the second load resistor 490 of the W phase, so no voltage is applied to the second load resistor 490 of the W phase. The determination unit 130 may determine whether the W phase input / output node 430 is short-circuited through the above process.

Finally, referring to FIG. 5, an embodiment for determining whether a wire is disconnected will be described. In order to determine whether or not the circuit is disconnected, the non-driven phase includes a pull-up resistor 460 having one end connected to the battery 440 and the other end connected to the input / output node 430, one end connected to the input / output node 430, Pull-down resistor 470. The resistance values of the pull-up resistor 460 and the pull-down resistor 470 may be the same or different. In addition, the voltage measuring unit 120 measures the voltage value of the non-driving input / output node 430, and the determining unit 130 can determine whether or not the voltage is on the basis of the voltage value of the non-driving input / output node 430 have.

At this time, when a disconnection occurs, the voltage value of the battery is applied to the W phase input / output node 430 in proportion to the value of the pull-down resistor 470. The voltage measuring unit 120 measures the voltage value output to the input / output node 430 of the W phase and the determining unit 130 determines whether the measured voltage value corresponds to the value of the pull-up resistor 460 and the divided voltage of the pull- Value, it can be determined whether or not the three-phase motor is disconnected.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

Claims (7)

An apparatus for detecting an abnormality in a three-phase motor including a driving phase and a non-driving phase,
A current measuring unit for measuring a direction of a current flowing in the driving phase;
A voltage measuring unit for measuring a voltage value of the first transistor or the second transistor in the non-driving phase corresponding to the direction of the current; And
And a determination unit for determining whether the three-phase motor is abnormal based on the voltage value measured by the voltage measurement unit
Includes 3-phase motor abnormality sensing device.
The method according to claim 1,
The drive phase
An input drive phase to which a current is input and an output drive phase to which the current is output;
Each of the input drive phase and the output drive phase
And a second transistor having one end connected to the battery and the other end connected to the input / output node, and the other end connected to the input / output node.
3. The method of claim 2,
The current measuring unit
Wherein the first transistor of the input driving circuit measures whether a current flows from the first transistor to the first transistor on the output driving circuit,
The voltage measuring unit
Wherein when the current flows from the first transistor on the input driving side to the first transistor on the output driving side, the second transistor of the non-driving phase is turned off and the first transistor of the non- The voltage value is measured,
The determination unit
And determines whether or not the ground fault is short-circuited based on the voltage value of the first transistor of the non-driving phase.
3. The method of claim 2,
The current measuring unit
Wherein the second transistor of the input driving circuit measures whether a current flows from the second transistor of the input driving circuit to the second transistor of the output driving circuit,
The voltage measuring unit
Wherein when the current flows from the second transistor on the input driving side to the second transistor on the output driving side, the first transistor of the non-driving phase is turned off and the second transistor of the non-driving phase is turned on, The voltage value is measured,
The determination unit
And determines whether the battery is short-circuited based on the voltage value of the second transistor of the non-driving phase.
The method according to claim 1,
The non-
A pull-up resistor having one end connected to the battery and the other end connected to the input / output node, and a pull-down resistor having one end connected to the input / output node and the other end grounded,
The voltage measuring unit
The voltage value of the input / output node of the non-driving phase is measured,
The determination unit
And determines whether or not the motor is disconnected based on the voltage value of the input / output node of the non-driving phase.
The method according to claim 1,
The non-
And a first load resistor having one end connected to the battery and the other end connected to the drain terminal of the first transistor,
The voltage measuring unit
Measuring a voltage of the first load resistor,
The determination unit
And determines whether or not the ground is short-circuited based on the voltage value of the first load resistor.
The method according to claim 1,
The non-
And a second load resistor having one end connected to the source terminal of the second transistor and the other end grounded,
The voltage measuring unit
Measuring a voltage of the second load resistor,
The determination unit
And determines whether the battery is short-circuited based on the voltage value of the second load resistor.
KR1020150172706A 2015-12-04 2015-12-04 Apparatus for sensing disorder of 3-phase motor KR101665890B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180060790A (en) * 2016-11-29 2018-06-07 현대오트론 주식회사 An Apparatus And A Method For Testing A Low-side Driver
KR20190071522A (en) * 2017-12-14 2019-06-24 현대오트론 주식회사 An Apparatus and A Method For Motor Failure Diagnosis
KR102217876B1 (en) * 2019-10-31 2021-02-18 주식회사 현대케피코 Motor control apparatus with short circuit diagnosis function and short circuit diagnosis method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58207882A (en) * 1982-05-26 1983-12-03 Fanuc Ltd Regenerative energy processor for ac motor
EP1387459B1 (en) * 2002-08-02 2009-04-22 Dr. Johannes Heidenhain GmbH Fault detection method for a drive assembly
KR20110138058A (en) * 2010-06-18 2011-12-26 현대모비스 주식회사 Disconnection sensing circuit of driving motor for electrical parking brake system
JP2015211591A (en) * 2014-04-28 2015-11-24 トヨタ自動車株式会社 Failure diagnosis device for driving device for brushless motor, and failure diagnosis method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58207882A (en) * 1982-05-26 1983-12-03 Fanuc Ltd Regenerative energy processor for ac motor
EP1387459B1 (en) * 2002-08-02 2009-04-22 Dr. Johannes Heidenhain GmbH Fault detection method for a drive assembly
KR20110138058A (en) * 2010-06-18 2011-12-26 현대모비스 주식회사 Disconnection sensing circuit of driving motor for electrical parking brake system
JP2015211591A (en) * 2014-04-28 2015-11-24 トヨタ自動車株式会社 Failure diagnosis device for driving device for brushless motor, and failure diagnosis method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180060790A (en) * 2016-11-29 2018-06-07 현대오트론 주식회사 An Apparatus And A Method For Testing A Low-side Driver
KR20190071522A (en) * 2017-12-14 2019-06-24 현대오트론 주식회사 An Apparatus and A Method For Motor Failure Diagnosis
KR101997834B1 (en) 2017-12-14 2019-07-08 현대오트론 주식회사 An Apparatus and A Method For Motor Failure Diagnosis
KR102217876B1 (en) * 2019-10-31 2021-02-18 주식회사 현대케피코 Motor control apparatus with short circuit diagnosis function and short circuit diagnosis method thereof

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