Six-phase motor temperature monitoring system

Abstract

A six-phase motor temperature monitoring system relates to the technical field of motor winding temperature monitoring and comprises a six-phase winding, a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor. The first temperature sensor is arranged at the central point of the phase end part of the six-phase winding; the second temperature sensor is arranged at the neutral point position of the six-phase winding; the third temperature sensor is arranged at the wire outlet end of the six-phase winding; the fourth temperature sensor is arranged at the non-wire outlet end of the six-phase winding; the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor form a three-dimensional temperature gradient dynamic capture network, so that the temperature monitoring system can better adapt to the spatial harmonic distribution characteristic of the six-phase winding, and the full-area coverage of the winding end and the conductor in the groove is realized. Therefore, the temperature gradient monitoring capability and reliability are improved.

Description

Technical Field

[0001] This utility model relates to the field of motor winding temperature monitoring technology, and in particular to a six-phase motor temperature monitoring system. Background Technology

[0002] A six-phase motor is an AC motor with six stator windings. Its working principle is similar to that of a conventional three-phase motor, but it offers significant advantages in operating efficiency, control performance, torque density, dynamic response, and fault tolerance. Therefore, it is widely used in electric vehicles and ship propulsion. The operating temperature of a six-phase motor varies depending on the environment and operating conditions. Excessive operating temperature can lead to decreased system performance, resulting in problems such as insulation damage and demagnetization of permanent magnets. Therefore, temperature monitoring of six-phase motors is essential.

[0003] Existing temperature monitoring systems for six-phase motors generally suffer from the following problems:

[0004] 1. Lack of phase symmetry: The temperature sensors of existing six-phase motors are based on the design concept of three-phase motors and adopt a single-layer planar ring array layout. This layout cannot effectively adapt to the unique spatial harmonic distribution characteristics of six-phase windings, resulting in systematic deviations in the temperature monitoring of adjacent phases.

[0005] 2. Insufficient end-point monitoring coverage: The existing temperature sensor arrangement method for six-phase motors has an axial monitoring blind zone in the temperature field analysis of the winding end area, especially the insufficient ability to monitor the temperature gradient at the junction of adjacent two-phase windings.

[0006] 3. Insufficient electromagnetic interference suppression: Existing temperature sensors for six-phase motors typically employ conventional single anti-interference schemes (such as using a single shielding material like copper mesh or ferrite). However, the high-order harmonic magnetic fields generated by the frequency converter power supply of the six-phase motor can severely interfere with the temperature sensor signal. Therefore, this conventional anti-interference scheme has limited ability to suppress high-order harmonic interference and cannot guarantee the stability of the measurement signal. Summary of the Invention

[0007] This invention provides a six-phase motor temperature monitoring system, the main purpose of which is to solve the problems existing in the prior art.

[0008] The present invention adopts the following technical solution:

[0009] A six-phase motor temperature monitoring system includes six-phase windings, a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. The first temperature sensor is located at the center point of a phase end of the six-phase winding. The second temperature sensor is located at the neutral point of the six-phase winding. The third temperature sensor is located at the output end of the six-phase winding. The fourth temperature sensor is located at the non-output end of the six-phase winding. The first, second, third, and fourth temperature sensors constitute a three-dimensional temperature gradient dynamic capture network.

[0010] Furthermore, each phase end of the six-phase winding is provided with a first temperature sensor.

[0011] Furthermore, a second temperature sensor is evenly distributed at the two neutral point positions of the six-phase winding.

[0012] Furthermore, the second temperature sensor has a double-layer shielding structure consisting of an inner layer of permalloy and an outer layer of copper mesh.

[0013] Furthermore, several third temperature sensors are evenly arranged circumferentially at the output terminals of the six-phase winding; several fourth temperature sensors are evenly arranged circumferentially at the non-output terminals of the six-phase winding.

[0014] Furthermore, the number of the third and fourth temperature sensors is the same, and the third and fourth temperature sensors are arranged symmetrically.

[0015] Furthermore, the number of the third and fourth temperature sensors is eight each.

[0016] Furthermore, the third temperature sensor is arranged at a position 0.85D on the outer edge of the outgoing end, and the fourth temperature sensor is arranged at a position 0.85D on the outer edge of the non-outgoing end, where D is the outer diameter of the end of the six-phase winding.

[0017] Furthermore, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are all three-wire PT1000 sensors.

[0018] Furthermore, the six-phase winding is a six-phase round wire winding.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. The temperature monitoring system provided by this utility model, through the synergistic effect of circumferential symmetrical arrangement scheme and axial symmetrical arrangement scheme, constructs a temperature monitoring system with a three-dimensional temperature gradient dynamic capture network that can cover the entire end area of ​​the six-phase winding. It can better adapt to the spatial harmonic distribution characteristics of the six-phase winding and realize full coverage of the winding end and the conductor in the slot, thereby improving the temperature gradient monitoring capability and reliability.

[0021] 2. This utility model adopts a double-layer shielding structure of composite anti-interference system, combined with three-wire differential measurement technology, to form a multi-level electromagnetic interference filtering mechanism, thereby effectively suppressing high-order harmonic interference generated by six-phase frequency conversion power supply and realizing high-precision temperature measurement. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the arrangement of the six-phase winding output terminals in this utility model.

[0023] Figure 2 This is a schematic diagram showing the arrangement of the non-outgoing terminals of the six-phase winding in this utility model.

[0024] In the diagram: 01 represents the temperature monitoring system, 02 represents the stator core, 03 represents the stator winding, 04 represents the rotor core, 05 represents the magnet, U1 represents the center point of the U1 phase end in the six-phase system, U2 represents the center point of the U2 phase end in the six-phase system, V1 represents the center point of the V1 phase end in the six-phase system, V2 represents the center point of the V2 phase end in the six-phase system, W1 represents the center point of the W1 phase end in the six-phase system, W2 represents the center point of the W2 phase end in the six-phase system, A1-A6 represent the first temperature sensors arranged at the center point of each phase end of the six-phase winding, Z1 and Z2 represent the second temperature sensors arranged at the two neutral points of the six-phase winding, B1-B8 represent the third temperature sensors arranged at intervals of 45° mechanical angle at the output ends of the six-phase winding, and C1-C8 represent the fourth temperature sensors arranged at intervals of 45° mechanical angle at the non-output ends of the six-phase winding. Detailed Implementation

[0025] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Many details are described below to provide a comprehensive understanding of this utility model; however, those skilled in the art can implement this utility model without these details.

[0026] like Figure 1 and Figure 2As shown, this utility model provides a six-phase motor temperature monitoring system, including a six-phase winding, a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. Specifically, the first temperature sensor is located at the center point of the phase ends of the six-phase winding; the second temperature sensor is located at the neutral point of the six-phase winding; the third temperature sensor is located at the output end of the six-phase winding; and the fourth temperature sensor is located at the non-output end of the six-phase winding. The first, second, third, and fourth temperature sensors constitute a three-dimensional temperature gradient dynamic capture network, enabling the temperature monitoring system to better adapt to the spatial harmonic distribution characteristics of the six-phase winding, achieving full coverage of the winding ends and the conductors within the slots, thereby improving the temperature gradient monitoring capability and reliability.

[0027] like Figure 1 As shown, in this embodiment, a first temperature sensor (labeled A1-A6) is evenly distributed at the centerline point of each phase end of the six-phase winding, thereby forming a hexagonal symmetrical main monitoring network. This achieves full-phase coverage of the temperature field in the asymmetrical region of the six-phase winding magnetic field, thus overcoming the limitations of traditional ring arrays, effectively reducing the temperature monitoring deviation between adjacent phases, and achieving matching with the spatial harmonic characteristics of the winding through a specific radius ratio. Preferably, in this embodiment, the coordinates of the phase center point of the hexagonal symmetrical main monitoring network are radius R = 0.85D (D is the outer diameter of the six-phase winding end), and the angles θ are 0°, 60°, 120°, 180°, 240°, and 300°.

[0028] like Figure 1 As shown in the figure, in this embodiment, a second temperature sensor (labeled Z1-Z2 in the figure) is evenly distributed at the two neutral point positions of the six-phase winding, thereby forming a neutral point monitoring module.

[0029] like Figure 1 and Figure 2 As shown, in this embodiment, several third temperature sensors are evenly arranged circumferentially at the output ends of the six-phase winding, and several fourth temperature sensors are also evenly arranged circumferentially at the non-output ends of the six-phase winding, thereby achieving enhanced end-point monitoring. It should be noted that since the phase end neutral point and phase end neutral point are also located at the output ends, the placement of the third temperature sensors should avoid these points; that is, the third temperature sensors should actually be placed at positions on the output ends of the six-phase winding other than the phase end neutral point and phase end neutral point. Therefore, the arrangement strategy provided in this embodiment can achieve complementary angle design, significantly improve the temperature monitoring coverage at the winding ends, and optimize the number of temperature sensors.

[0030] like Figure 1 and Figure 2As shown, to further construct an axisymmetric monitoring network, the number of the third and fourth temperature sensors should be the same, and they should be arranged symmetrically. As a preferred embodiment, in this case, there are eight third and four temperature sensors each. Specifically, eight third temperature sensors (labeled B1-B8) are arranged at 45° intervals along the mechanical angle at the output ends of the six-phase windings, and eight fourth temperature sensors (labeled C1-C8) are arranged at 45° intervals along the mechanical angle at the non-output ends of the six-phase windings. This forms a 45° mechanical angle monitoring loop at both ends of the six-phase windings, providing complementary coverage to the hexagonal main monitoring network. However, in practice, the number of third and fourth temperature sensors can differ, depending on the actual monitoring requirements.

[0031] like Figure 1 and Figure 2 As shown, the first, second, third, and fourth temperature sensors are all three-wire PT1000 sensors. Specifically, the PT1000 sensors have a diameter ≤0.5mm and are fixed to the end surface of the six-phase winding using high-temperature resistant epoxy resin. The leads of each temperature sensor are led out along the stator slot wedge direction, and a distance of more than 3mm is maintained between each lead to avoid crosstalk.

[0032] like Figure 1 As shown, the second temperature sensor has a double-layer shielding structure consisting of an inner permalloy layer and an outer copper mesh layer. The shielding layer and the sensor leads are led out synchronously along the stator slot wedge. The double-layer shielding structure employs a composite anti-interference system, combined with three-wire differential measurement technology, to form a multi-level electromagnetic interference filtering mechanism. This effectively suppresses high-order harmonic interference generated by the six-phase frequency converter power supply, achieving high-precision temperature measurement.

[0033] like Figure 1 and Figure 2 As shown, the third temperature sensor is positioned 0.85D from the outer edge of the output terminal, and the fourth temperature sensor is positioned 0.85D from the outer edge of the non-output terminal, where D is the outer diameter of the six-phase winding end. Limiting the installation positions of the third and fourth temperature sensors effectively prevents oil from the six-phase motor from spraying onto the temperature sensors, thereby ensuring the accuracy of the test results.

[0034] like Figure 1 As shown, the preferred scheme is a six-phase round wire winding. Compared with a six-phase flat wire winding, the six-phase round wire winding has the advantages of simple design and manufacturing, low cost, convenient maintenance and good insulation performance.

[0035] like Figure 1As shown, each temperature sensor is connected to the live temperature rise tester via a three-wire differential measurement method. The live temperature rise tester collects data according to actual test requirements and generates a temperature rise test report. The temperature rise test report includes the winding temperature distribution cloud map, the coordinates of the highest temperature point, and phase balance analysis data as required by the ISO 21782 standard.

[0036] The temperature sensor layout scheme based on multi-dimensional thermal field analysis provided in this embodiment includes a circumferentially symmetrical arrangement and an axially symmetrical arrangement. The circumferentially symmetrical arrangement involves covering the asymmetrical region of the magnetic field of the six-phase windings at the output ends with a hexagonal symmetrical main monitoring network, combined with a 45° mechanical angle secondary monitoring ring to reduce temperature monitoring blind spots. The axially symmetrical arrangement forms a mirror-symmetrical monitoring network between the output and non-output ends of the six-phase windings, achieving axial temperature field symmetry detection. Therefore, through the synergistic effect of the circumferentially and axially symmetrical arrangements, a temperature monitoring system with a three-dimensional temperature gradient dynamic capture network covering the entire end region of the six-phase windings can be constructed. This enables full-dimensional analysis of the temperature field at the end of the six-phase windings and significantly reduces implementation costs while maintaining measurement accuracy.

[0037] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A six-phase motor temperature monitoring system, characterized in that: It includes a six-phase winding, a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor; the first temperature sensor is located at the center point of the phase end of the six-phase winding; the second temperature sensor is located at the neutral point of the six-phase winding; the third temperature sensor is located at the output end of the six-phase winding; and the fourth temperature sensor is located at the non-output end of the six-phase winding; the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor constitute a three-dimensional temperature gradient dynamic capture network.

2. The six-phase motor temperature monitoring system as described in claim 1, characterized in that: The first temperature sensor is evenly distributed at the midline point of each phase end of the six-phase winding.

3. The six-phase motor temperature monitoring system as described in claim 1, characterized in that: The second temperature sensor is evenly distributed at the two neutral point positions of the six-phase winding.

4. The six-phase motor temperature monitoring system as described in claim 1, characterized in that: The second temperature sensor has a double-layer shielding structure consisting of an inner layer of permalloy and an outer layer of copper mesh.

5. The six-phase motor temperature monitoring system as described in claim 1, characterized in that: The output terminals of the six-phase winding are uniformly arranged with several third temperature sensors along the circumference; the non-output terminals of the six-phase winding are uniformly arranged with several fourth temperature sensors along the circumference.

6. The six-phase motor temperature monitoring system as described in claim 5, characterized in that: The number of the third and fourth temperature sensors is the same, and the third and fourth temperature sensors are arranged symmetrically.

7. The six-phase motor temperature monitoring system as described in claim 6, characterized in that: The number of the third and fourth temperature sensors is 8 each.

8. The six-phase motor temperature monitoring system as described in claim 1, characterized in that: The third temperature sensor is located at a position 0.85D on the outer edge of the outgoing end, and the fourth temperature sensor is located at a position 0.85D on the outer edge of the non-outgoing end, where D is the outer diameter of the end of the six-phase winding.

9. The six-phase motor temperature monitoring system as described in claim 1, characterized in that: The first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are all three-wire PT1000 sensors.

10. A six-phase motor temperature monitoring system as described in claim 1, characterized in that: The six-phase winding is a six-phase round wire winding.

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