CN115001220A - Planar inductance coil for detecting position of motor rotor - Google Patents
Planar inductance coil for detecting position of motor rotor Download PDFInfo
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- CN115001220A CN115001220A CN202210759895.1A CN202210759895A CN115001220A CN 115001220 A CN115001220 A CN 115001220A CN 202210759895 A CN202210759895 A CN 202210759895A CN 115001220 A CN115001220 A CN 115001220A
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- 238000004804 winding Methods 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000001360 synchronised effect Effects 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims abstract description 4
- 230000006698 induction Effects 0.000 claims description 17
- 230000008859 change Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 239000013598 vector Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/225—Detecting coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2871—Pancake coils
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/12—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils using the machine windings as detecting coil
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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
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/183—Circuit arrangements for detecting position without separate position detecting elements using an injected high frequency signal
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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
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/185—Circuit arrangements for detecting position without separate position detecting elements using inductance sensing, e.g. pulse excitation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
A planar inductance coil for detecting the position of a motor rotor comprises 3 planar inductance coils with the same structure, each planar inductance coil is a planar inductance coil formed by winding a wire into a rectangular planar structure at a 90-degree folded angle, two ends of each planar inductance coil are led out, 3 planar inductance coils are respectively fixed on the surface of a permanent magnet synchronous motor stator tooth at intervals of 120-degree electrical angle difference and are connected by adopting a star connection method to form a-phase coil, a b-phase coil and a c-phase coil, the planar inductance coils and a motor armature winding are mutually insulated, and the leading-out ends of the a-phase coil, the b-phase coil and the c-phase coil and the leading-out ends of neutral points of the 3 planar inductance coils are led out to the outside of the permanent magnet synchronous motor and are connected with an external motor rotor position detection system. The invention has smaller thickness, does not occupy the space of a motor, does not influence the placement of an armature winding, is simpler to realize, and improves the accuracy of judging the position of the rotor.
Description
Technical Field
The invention relates to a planar inductance coil. In particular to a planar inductance coil for detecting the position of a motor rotor.
Background
The built-in permanent magnet motor is widely applied to the field of electric automobiles due to the advantages of simple structure, small volume, higher power density and the like. In order to realize the magnetic field orientation control in the motor, a position sensor needs to be installed to acquire the position information of the rotor, but the position sensor increases the volume and complexity of the motor, and the motor is difficult to work in a severe environment due to the narrow working temperature range, so that the permanent magnet motor control without the position sensor is increasingly concerned by people.
When the permanent magnet motor runs at a high speed, the position of the rotor of the motor is generally obtained by detecting a back electromotive force method, but when the motor is in a low-speed or static state, the amplitude of the back electromotive force is smaller or even zero, and the back electromotive force method fails to detect the position of the rotor, so that the method is only suitable for the high-speed running state of the motor. When the motor is operating at low speed, the rotor position can be obtained by an inductive method. Under the static and low-speed running state of the motor, the position of the rotor can be judged by utilizing the salient pole effect of the motor, namely the characteristic that the inductance of the armature winding changes along with the change of the position of the rotor.
In order to detect the rotor position, it is generally necessary to inject a voltage vector into the motor winding, and determine the rotor position by determining the difference in winding inductance based on the magnitude of the response current. The traditional voltage vector injection method is realized by controlling the on-off of a switching tube of an inverter, but the method is limited by fixed direct-current side voltage and limited inverter switching frequency, a plurality of applied voltage vectors can generate obvious response current, so that the motor is rotated by mistake, a position detection signal is influenced by the electric quantity in an armature winding, so that the inductance detection is difficult, and the rotor position is judged inaccurately.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a planar inductance coil for detecting the position of a motor rotor, which can avoid the influence of a rotor position detection signal on the electric quantity in a motor armature winding and improve the rotor position judgment accuracy.
The technical scheme adopted by the invention is as follows: a planar inductance coil for detecting the position of a motor rotor comprises 3 planar inductance coils with the same structure, each planar inductance coil is a planar inductance coil formed by winding a lead at a 90-degree folded angle into a rectangular planar structure, two ends of each planar inductance coil are led out, 3 planar inductance coils are respectively fixed on the surface of a permanent magnet synchronous motor stator tooth at intervals of 120-degree electrical angle difference and are connected by adopting a star connection method to form a phase a, a phase b and a phase c coils, the planar inductance coils and a motor armature winding are mutually insulated, and the leading-out ends of the phase a, the phase b and the phase c and the leading-out ends of neutral points of the 3 planar inductance coils are led out to the outside of the permanent magnet synchronous motor and are connected with an external motor rotor position detection system.
The thickness of the planar inductance coil is 0.1-0.2 mm.
Each planar inductance coil corresponds to the armature winding axis of the motor stator tooth, namely the axis of each planar inductance coil is fixed on the surface of the permanent magnet synchronous motor stator tooth in a layout mode of aligning with the armature winding axis of the motor stator tooth.
And the inductance change rule of the a-phase, B-phase and C-phase windings formed by the 3 planar inductance coils is consistent with the inductance change rule of the A-phase, B-phase and C-phase windings of the tooth armature windings of the corresponding motor stator.
The invention discloses a planar inductance coil for detecting the position of a motor rotor, which has the following beneficial effects:
1. the planar inductance coil is fixed on the surface of the motor stator tooth, has small thickness, does not occupy the space of a motor, does not influence the placement of an armature winding, and is simple to realize.
2. The planar inductance coil avoids the influence of the rotor position detection signal on the electric quantity in the armature winding of the motor, solves the problem of difficult inductance detection caused by the influence of strong electricity in the armature winding, and improves the accuracy of rotor position judgment.
3. The plane inductance coil can still detect the position of the rotor when the motor is in a static or low-speed running state.
4. The invention realizes the electrical isolation between the armature winding loop and the strong and weak electricity of the low-voltage high-frequency signal loop.
Drawings
FIG. 1 is a schematic structural diagram of a planar induction coil for rotor position detection of an electric machine according to the present invention;
FIG. 2 is a distribution diagram of a planar induction coil in a permanent magnet synchronous motor for position detection of a motor rotor according to the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a pictorial view of a planar induction coil motor rotor position detection system for motor rotor position detection employing the present invention;
FIG. 5 is a schematic diagram of the relationship between the magnitude of the three-phase inductance formed by three planar induction coils and the position of the rotor according to the present invention;
FIG. 6a is a schematic diagram of an equivalent circuit for detecting the effective values of the ab-phase and the high-frequency voltage components of the high-frequency signal injected into the planar inductive coil;
FIG. 6b is a schematic diagram of an equivalent circuit for injecting a high-frequency signal into the bc phase of the planar inductor and detecting the effective value of the high-frequency voltage component;
FIG. 6c is a schematic diagram of an equivalent circuit for detecting the effective phase of the high-frequency signal injected into the planar inductor ca and the effective phase of the high-frequency voltage component.
In the drawings
1: a direct-current power supply 2: inverter with a voltage regulator
3: brushless dc motor 4: search coil
5: high-frequency sinusoidal signal generating circuit 6: signal gating circuit
7: effective value detection circuit 8: motor controller
9: the lead 10: end socket
11: end head 12: axial line
Detailed Description
The following describes a planar induction coil for detecting the position of a rotor of an electric machine according to the present invention in detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1, 2, and 3, the planar inductance coil for detecting the position of the rotor of the motor of the present invention includes 3 planar inductance coils 4 having the same structure, each planar inductance coil 4 is a planar inductance coil 4 formed by winding a conductive wire 9 into a rectangular planar structure at a 90-degree bevel, and the thickness of the planar inductance coil 4 is 0.1-0.2 mm. Two ends 10 and 11 of each planar inductance coil 4 are led out, 3 planar inductance coils 4 are respectively fixed on the surface of a permanent magnet synchronous motor stator tooth at intervals of 120-degree electrical angle difference and are connected by adopting a star connection method to form a phase a, a phase b and a phase c coil, the planar inductance coils 4 and a motor armature winding are mutually insulated, and the leading-out ends of the phase a, the phase b and the phase c and the neutral point leading-out ends of the 3 planar inductance coils 4 are led out to the outside of the permanent magnet synchronous motor and are connected with an external motor rotor position detection system.
Each planar inductance coil 4 corresponds to the armature winding axis of the motor stator tooth, namely, the axis 12 of each planar inductance coil 4 is fixed on the surface of the permanent magnet synchronous motor stator tooth in a layout mode of aligning with the armature winding axis of the motor stator tooth. The inductance change rule of the a-phase, B-phase and C-phase windings formed by the 3 planar inductance coils 4 is consistent with the inductance change rule of the A-phase, B-phase and C-phase windings of the tooth armature windings of the motor stator.
As shown in fig. 4, the system for detecting the position of the rotor of the planar induction coil motor according to the present invention comprises a permanent magnet synchronous motor 3, a dc power supply 1 for supplying power to the permanent magnet synchronous motor 3 through an inverter 2, and a motor controller 8 connected to the inverter 2 for controlling the operation of the inverter 2, wherein the permanent magnet synchronous motor 3 is provided with a planar induction coil 4 for acquiring the position of the rotor of the permanent magnet synchronous motor 3 and displaying the position through an induction signal, an outgoing end of the planar induction coil 4 is connected to a signal gating circuit 6, and acquires a high-frequency sinusoidal signal sent by a high-frequency sinusoidal signal generating circuit 5 connected to the signal gating circuit 6 through the signal gating circuit 6, an outgoing end of the planar induction coil 4 is further connected to an effective value detecting circuit 7 for sending a signal obtained by coupling the induction signal and the high-frequency sinusoidal signal to the effective value detecting circuit 7, the output end of the effective value detection circuit 7 is connected with a motor controller 8 and used for sending the detected high-frequency voltage component effective value of each phase winding of the planar inductance coil 4 into the motor controller 8, the motor controller 8 controls the output of the inverter 2 according to the high-frequency voltage component effective value of each phase winding of the planar inductance coil 4, and the motor controller 8 is further connected with a signal gating circuit 6 and used for controlling the gating of different output signals of the signal gating circuit 6.
The planar inductance coil 4 for motor rotor position detection of the present invention shown in fig. 1 is fixed on the tooth surface of the motor, and "10" and "11" are the leading ends of the coil.
Three planar inductance coils 4 are fixed on the surface of the motor stator teeth at intervals of 120-degree electrical angle difference, and the three planar inductance coils are sequentially combined into a-phase coil, a b-phase coil and a c-phase coil by adopting a star connection method.
The inductance of the planar inductor 4 is influenced by the salient pole effect of the motor rotor to exhibit a periodic sinusoidal change, and the change rule between the inductance and the rotor position is shown in fig. 5. The inductance change rule of the three-phase winding of the planar inductance coil 4 is consistent with the inductance change rule of the A phase, the B phase and the C phase of the armature winding.
In the motor rotor position detection system adopting the planar inductance coil for detecting the position of the motor rotor, the invention comprises the following components:
the motor controller 8 has an ADC sampling function based on a TMS320F28335 main control chip of TI company, pulse signals sent by an ePWM module are used for controlling and driving an inverter switching tube, and rich GPIO ports output high and low level signals which can be used for controlling an external circuit.
The high-frequency signal generated by the high-frequency sinusoidal signal generating circuit 5 is sent by the signal source chip ICL8038, and the frequency and amplitude of the sent signal can be flexibly adjusted.
The signal gating circuit 6 adopts an analog switch circuit chip 74HC4053, the input signals of S1, S2 and S3 pins of the 74HC4053 are controlled by GPIO output signals of the motor controller 8, the GPIO port outputs corresponding high-low level control 74HC4053 to selectively pass high-frequency signals, and the high-frequency signals are sequentially injected into ab phase, bc phase and ca phase of the planar inductance coil through the 74HC4053, so that different phases of signal injection is realized.
The effective value detection circuit 7 mainly comprises an effective value detection chip AD637 and a band-pass filter, the bandwidth center frequency of the band-pass filter is consistent with the frequency of a high-frequency signal, the filter filters low-frequency noise induced and generated in a planar inductance coil when a motor operates, the high-frequency signal is extracted and input to the AD637 chip, the AD637 chip outputs the effective value of the high-frequency signal, the effective value is transmitted to an ADC sampling port of the motor controller 8, and the motor controller 8 processes the effective values of the high-frequency signal obtained by voltage division of a-phase, b-phase and c-phase windings of the sampled planar inductance coil.
The detection method of the motor rotor position detection system of the plane inductance coil for detecting the motor rotor position comprises the steps that low-voltage high-frequency sinusoidal signals generated by a high-frequency signal source are respectively injected into ab phase, bc phase and ca phase of a permanent magnet synchronous motor plane inductance coil 4 through a signal gating circuit 6, an effective value detection circuit 7 extracts the effective value of high-frequency voltage obtained by each phase of winding and transmits the effective value to a motor controller 8 to compare the magnitude relation of the inductance of each phase of winding, and the electric angle interval where the motor rotor is located is judged according to the change characteristic of the inductance of the plane inductance coil 4 along with the position of the rotor, so that the position-sensor-free control of the permanent magnet synchronous motor is realized. The method specifically comprises the following steps:
1) applying a set voltage vector to an armature winding of the permanent magnet synchronous motor 3, and performing initial pre-positioning on the permanent magnet synchronous motor 3 to enable the N pole of the motor rotor to be in an electric angle range of 0-180 degrees or in an electric angle range of 180-360 degrees;
2) the motor controller 8 controls the gating circuit 6 to work, and high-frequency sinusoidal signals flow through the signal gating circuit 6 and are injected into ab two phases, bc two phases and ca two phases of the planar inductance coil 4 in sequence;
3) when high-frequency sinusoidal signals are injected into the ab two-phase of the planar induction coil 4, the effective value detection circuit 7 converts the obtained high-frequency sinusoidal voltages of the a-phase and the b-phase into effective values (direct current quantities) U, respectively a_rms And U b_rms The equivalent circuit is shown in fig. 6 a; since the larger the inductance value is, the larger the divided high-frequency voltage is, and the larger the converted effective value is, the motor controller 8 compares the a-phase inductance L by sampling the effective value output by the effective value detection circuit 7 a And b phase inductance L b The size of (d); similarly, when the high-frequency sinusoidal signal is injected into the bc two-phase of the planar inductor 4, the effective value detection circuit 7 converts the obtained b-phase and c-phase high-frequency sinusoidal voltages into effective values U respectively b_rms And U c_rms By detecting U b_rms And U c_rms Comparing out the b-phase inductance L b And c-phase inductance L c The equivalent circuit is shown in fig. 6 b; similarly, when the high-frequency sinusoidal signal is injected into the ca two-phase of the planar induction coil 4, the effective value detection circuit 7 converts the obtained c-phase and a-phase high-frequency sinusoidal voltages into effective values U respectively c_rms And U a_rms By detecting U c_rms And U a_rms Comparing out c-phase inductance L c And a phase inductance L a The equivalent circuit is shown in fig. 6 c; finally, the three-phase inductance L of the planar inductance coil 4 is obtained a 、L b And L c The size relationship between the three;
4) three-phase inductance L from a planar inductor coil 4 a 、L b And L c Determining an accurate electrical angle interval of the N pole of the rotor of the motor by combining the inductance distribution characteristic shown in figure 5 and the motor prepositioning interval in the step 1); the method comprises the following steps:
at L a >L c ≥L b Firstly judging that the N pole of the motor rotor is positioned in two electrical angle ranges of 0-30 degrees or 180-210 degrees; when the initial pre-positioning of the N pole of the motor rotor is between 0 and 180 DEGWhen the electrical angle is large, the N pole of the motor rotor is judged to be in a small range of 0-30 electrical angles; when the initial pre-positioning of the N pole of the motor rotor is in a large range of 180-360 degrees of electrical angle, judging that the N pole of the motor rotor is in a small range of 180-210 degrees of electrical angle;
at L c ≥L a >L b Firstly judging whether the N pole of the motor rotor is positioned in two electrical angle ranges of 30-60 degrees or 210-240 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of 0-180 degrees of electrical angle, judging that the N pole of the motor rotor is in a small range of 30-60 degrees of electrical angle; when the initial pre-positioning of the N pole of the motor rotor is in a large range of 180-360 degrees in electrical angle, judging that the N pole of the motor rotor is in a small range of 210-240 degrees in electrical angle;
at L c >L b ≥L a Firstly judging whether the N pole of the motor rotor is positioned in two electrical angle ranges of 60-90 degrees or 240-270 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of an electrical angle from 0 degree to 180 degrees, judging that the N pole of the motor rotor is in a small range of an electrical angle from 60 degrees to 90 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of 180-360 degrees of electrical angle, judging that the N pole of the motor rotor is in a small range of 240-270 degrees of electrical angle;
at L b ≥L c >L a Firstly judging that the N pole of the motor rotor is positioned in two electrical angle intervals of 90-120 degrees or 270-300 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of an electrical angle from 0 degree to 180 degrees, judging that the N pole of the motor rotor is in a small range of an electrical angle from 90 degrees to 120 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of 180-360 degrees of electrical angle, judging that the N pole of the motor rotor is in a small range of 270-300 degrees of electrical angle;
at L b >L a ≥L c Firstly judging whether the N pole of the motor rotor is positioned in two electrical angle ranges of 120-150 degrees or 300-330 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of an electrical angle from 0 degree to 180 degrees, judging that the N pole of the motor rotor is in a small range of an electrical angle from 120 degrees to 150 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of 180-360 degrees in electrical angle, the N pole of the motor rotor is judged to be 300-330 degreesWithin the electrical angle cell;
when L is a ≥L b >L c Firstly judging whether the N pole of the motor rotor is positioned in two electric angle ranges of 150 degrees to 180 degrees or 330 degrees to 360 degrees; when the initial pre-positioning of the N pole of the motor rotor is in a large range of 0-180 degrees of electrical angle, judging that the N pole of the motor rotor is in a small range of 150-180 degrees of electrical angle; and when the initial pre-positioning of the N pole of the motor rotor is in a large range of 180-360 electrical angles, judging that the N pole of the motor rotor is in a small range of 330-360 electrical angles.
5) The motor controller 8 applies corresponding switching signals to the inverter 2 according to the precise electrical angle interval of the N pole of the motor rotor to drive the permanent magnet synchronous motor 3;
6) and returning to the step 2) to continue circulation, and realizing continuous operation of the permanent magnet synchronous motor under the control of no position sensor.
The corresponding relationship between the three-phase inductance of the planar induction coil 4 and the electrical angle interval of the N pole of the motor rotor is shown in table 1.
TABLE 1 comparison of three-phase inductance of planar inductance coil and N-pole electric angle interval of motor rotor
Claims (4)
1. A planar inductance coil for detecting the position of a motor rotor is characterized by comprising 3 planar inductance coils (4) with the same structure, each planar inductance coil (4) is a planar inductance coil (4) which is formed by winding a lead (9) into a rectangular planar structure at a 90-degree folding angle, two ends (10 and 11) of each planar inductance coil (4) are led out, the 3 planar inductance coils (4) are respectively fixed on the surface of a permanent magnet synchronous motor stator tooth at intervals of 120-degree electrical angle difference and are connected by adopting a star connection method to form a-phase coil, a-phase coil and a-phase coil, the planar inductance coils (4) and a motor armature winding are mutually insulated, the leading-out ends of the a-phase coil, the b-phase coil and the c-phase coil and the leading-out ends of neutral points of the 3 planar inductance coils (4) are led out to the outside of the permanent magnet synchronous motor, and connecting an external motor rotor position detection system.
2. The planar inductance coil for detecting the position of the rotor of the motor according to claim 1, wherein the thickness of the planar inductance coil (4) is 0.1-0.2 mm.
3. A planar induction coil for detecting the position of a rotor of an electric motor as claimed in claim 1, characterized in that each planar induction coil (4) corresponds to the armature winding axis of the corresponding motor stator tooth, i.e. the axis (12) of each planar induction coil (4) is fixed on the surface of the permanent magnet synchronous motor stator tooth in an arrangement aligned with the armature winding axis of the corresponding motor stator tooth.
4. The planar inductance coil for detecting the position of the rotor of the motor according to claim 1, wherein the inductance variation law of the a-phase, B-phase and C-phase windings formed by 3 planar inductance coils (4) is consistent with the inductance variation law of the A-phase, B-phase and C-phase windings of the armature winding of the tooth armature of the stator of the motor.
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| CN202210759895.1A CN115001220A (en) | 2022-06-30 | 2022-06-30 | Planar inductance coil for detecting position of motor rotor |
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| CN202210759895.1A CN115001220A (en) | 2022-06-30 | 2022-06-30 | Planar inductance coil for detecting position of motor rotor |
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