CN210468927U

CN210468927U - Motor rotor assembly and motor

Info

Publication number: CN210468927U
Application number: CN201921616648.6U
Authority: CN
Inventors: 胡余生; 陈彬; 张小波; 彭利明; 李广海; 梁建东; 熊博文; 王珊珊; 张勐
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-05-05
Anticipated expiration: 2029-09-26

Abstract

The utility model provides an electric motor rotor subassembly, motor. The motor rotor assembly comprises a rotating shaft, wherein the rotating shaft is provided with a magnetic conduction shaft section, a permanent magnet is fixedly connected to the magnetic conduction shaft section, the motor rotor assembly further comprises a temperature detection part, and a temperature sensing head of the temperature detection part is in contact with the surface of the permanent magnet. The utility model discloses a motor rotor subassembly, motor, temperature detection part and permanent magnet surface direct contact can monitor the temperature of permanent magnet when the rotor subassembly is rotatory in real time and accurately.

Description

Motor rotor assembly and motor

Technical Field

The utility model belongs to the technical field of the motor is made, concretely relates to electric motor rotor subassembly, motor.

Background

The temperature rise of the motor is one of important indexes for measuring the performance of the motor, and has a direct relation with the service life of the motor, and if the temperature rise of the motor is too high, the motor is easy to damage. Particularly, for a high-speed permanent magnet motor, the high-speed permanent magnet motor has the characteristics of small volume, high power density and the like, and meanwhile, high eddy current loss can be generated on the surfaces of a rotor core and a permanent magnet by high-frequency harmonic waves, so that the permanent magnet is easy to demagnetize when the rotor runs at a high temperature. Therefore, it is very important to detect the temperature of the motor rotor, especially the permanent magnet, and in addition, the temperature measurement data of the rotor is also essential basic data for the structural design optimization of the high-speed motor.

However, due to the high-speed operation of the rotor of the high-speed motor, it is very difficult to measure the temperature of the rotor. The limited detection means either lack real-time performance and accuracy, or the implementation method is complex and difficult to be applied practically. The traditional high-speed permanent magnet motor rotor measuring method mainly comprises the following two methods, one method is that a detection device is connected immediately after the motor is shut down and power is cut off, the surface temperature of the rotor is directly measured, however, the time difference exists between the shutdown and the detection of the connection device, the measured temperature is the temperature after the rotor is static, and the surface temperature condition of the rotor when the rotor runs at a high speed cannot be accurately obtained; the other method is that irreversible temperature indicating paint is coated on the surface of the rotor, the temperature distribution condition of the rotor during operation is measured according to the color change of the paint, but the color change corresponds to a larger temperature gradient, and the difference among various colors is not obvious, so that the temperature error of the measured rotor is very large; in addition, a temperature measuring sensor, such as an infrared sensor, is installed at a position where the motor stator is adjacent to the permanent magnet to directly measure the temperature, but the temperature of the permanent magnet is measured only by the surface temperature in these methods, and in many cases, the permanent magnet (e.g., permanent magnet) is embedded in the rotor core, and the temperature of the rotor surface cannot be directly reflected by the temperature change of the permanent magnet.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model is to provide an electric motor rotor subassembly, motor, temperature detection part and permanent magnet surface direct contact can monitor the temperature of permanent magnet when the rotor subassembly is rotatory in real time and accurately.

In order to solve the problem, the utility model provides an electric motor rotor subassembly, which comprises a rotating shaft, the pivot has the magnetic conduction shaft part, fixedly connected with permanent magnet still includes the temperature detection part on the magnetic conduction shaft part, the temperature sensing head contact of temperature detection part the surface of permanent magnet.

Preferably, a first accommodating groove is formed in the magnetic conduction shaft section, and the temperature detection part is installed in the first accommodating groove.

Preferably, a signal transmission channel is configured on the rotating shaft to transmit a detection result signal of the temperature detection part to a signal receiving device.

Preferably, the temperature detection means comprises a wireless temperature sensor.

Preferably, the temperature detection component further comprises a self-powered module for powering the wireless temperature sensor.

Preferably, the self-powered module comprises a piezoelectric material.

Preferably, the first receiving groove has a plurality of, and a plurality of the first receiving grooves are arranged along the axial direction of the rotating shaft at intervals.

Preferably, axial limiting shaft sections are respectively arranged at two axial ends of the magnetic conduction shaft section, and the axial limiting shaft sections and the magnetic conduction shaft sections are coaxially arranged.

Preferably, a second accommodating groove is formed in one side, facing the permanent magnet, of the axial limiting shaft section, and the temperature detection part is installed in the second accommodating groove.

Preferably, the motor rotor assembly further comprises a protective sleeve, and the protective sleeve is sleeved on the outer peripheral side of the permanent magnet.

Preferably, the protection sleeve and the outer periphery of the permanent magnet are in interference fit.

Preferably, a third accommodating groove is formed in one side, facing the permanent magnet, of the protective sleeve, and the temperature detection component is installed in the third accommodating groove.

Preferably, the permanent magnet is tile-shaped, and the permanent magnet is provided with a plurality of permanent magnets; and or, the permanent magnet is bonded with the magnetic conduction shaft section.

Preferably, the temperature sensing head contacts an inner surface of the permanent magnet.

The utility model also provides a motor, including foretell motor rotor subassembly.

Preferably, the motor further comprises a signal receiving device for receiving a detection result signal sent by the temperature detection component.

Preferably, the signal receiving device is arranged on an end cover, and/or a stator, and/or a shell of the motor.

The utility model provides a pair of electric motor rotor subassembly, motor, will the temperature sensing head of temperature detection part with the surperficial direct contact of permanent magnet to realized the direct detection to the rotor subassembly at the temperature of operation in-process permanent magnet, thereby can monitor the temperature of permanent magnet when the rotor subassembly is rotatory in real time and accurately.

Drawings

Fig. 1 is a schematic perspective view of a rotating shaft in a motor rotor assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

fig. 3 is a schematic view of an internal structure of a motor according to another embodiment of the present invention.

The reference numerals are represented as:

1. a rotating shaft; 11. a magnetically conductive shaft section; 111. a first accommodating groove; 12. axially limiting the shaft section; 121. a second accommodating groove; 2. a protective sleeve; 3. a permanent magnet; 4. a temperature detection part; 5. a signal transmission channel; 6. a signal receiving device; 7. a stator; 8. an end cap; 9. a housing.

Detailed Description

With reference to fig. 1 to 3, according to the embodiment of the present invention, a motor rotor assembly, especially suitable for a high-speed motor, is provided, including a rotating shaft 1, the rotating shaft 1 has a magnetic conduction shaft section 11, a permanent magnet 3 is fixedly connected to the magnetic conduction shaft section 11, for example, the permanent magnet 3 is adhered to the outer peripheral wall of the magnetic conduction shaft section 11 by a dedicated permanent magnet, and further includes a temperature detection component 4, and the temperature sensing head of the temperature detection component 4 contacts the surface of the permanent magnet 3. In the technical scheme, the temperature sensing head of the temperature detection part 4 is in direct contact with the surface of the permanent magnet 3, so that the direct detection of the temperature of the permanent magnet 3 in the operation process of the rotor assembly is realized, and the temperature of the permanent magnet 3 in the rotation process of the rotor assembly can be accurately monitored in real time. The temperature sensing head of the temperature detecting component 4 may contact, for example, an outer peripheral vertical wall (e.g., a thickness direction) of the permanent magnet 4, and in some cases, may also contact an outer side wall (i.e., a surface facing a side of the stator) of the permanent magnet 4, and preferably, the temperature sensing head contacts an inner surface of the permanent magnet 3, i.e., a surface contacting and cooperating with the magnetic conductive shaft section 11, so as to be able to accurately detect a temperature of an inner side of the permanent magnet 3, which can most accurately reflect a temperature overall condition of the rotor. The material of the magnetic conducting shaft segment 11 can be selected from 40CrNiMoA, 42CrMo and the like.

It can be understood that the first receiving groove 111 is formed in the magnetic conductive shaft segment 11, the temperature detecting part 4 is installed in the first receiving groove 111, and the temperature sensing head of the temperature detecting part 4 contacts the inner surface of the permanent magnet 3 through the opening position of the first receiving groove 111, so that the structure of the rotor assembly is simple and compact, the installation reliability of the temperature detecting part 4 is higher, and the position change of the temperature detecting part 4 relative to the permanent magnet 3 is effectively prevented.

The temperature detection part 4 can be, for example, a traditional temperature sensor with wired transmission, and at this time, a corresponding slip ring needs to be arranged between the rotating shaft 1 and the stationary part to perform uninterrupted transmission on a corresponding detection result signal, but the slip ring structure is worn greatly when applied to a high-speed motor, and reliability cannot be guaranteed; therefore, it is preferable that the temperature detecting part 4 is a wireless temperature sensor, and a signal transmission channel 5 is configured on the rotating shaft 1 to transmit a detection result signal of the temperature detecting part 4 to a signal receiving device 6, and the installation position of the signal receiving device 6 may be various, which will be described later.

Further, the temperature detecting component 4 further includes a self-powered module for supplying power to the wireless temperature sensor, the self-powered module is a generic name of a module or a component that can enable the wireless temperature sensor to operate under power without being connected to an external power supply device through a cable, for example, a conventional button battery can be used, but this power supply mode is limited by the battery capacity, so that the service life of the temperature detecting component 4 is short, and there is a great difficulty in replacing the temperature detecting component, for example, the permanent magnet 3 located outside the temperature detecting component needs to be detached, based on this deficiency, the self-powered module preferably includes a piezoelectric material, and of course, the self-powered module further includes a corresponding circuit converting module (such as a corresponding circuit chip), which are technologies that are often used in the prior art, and the present invention is no longer, it should be noted that the piezoelectric material is a special material that generates electric energy inside itself when deformation occurs, and the present application intends to skillfully adopt this characteristic of the piezoelectric material, apply it on the motor shaft and utilize the small deformation generated by the shaft 1 during operation and the centrifugal force to realize the power generation function of the piezoelectric material, that is, the present invention does not intend to limit the specific structure of the piezoelectric material.

The first accommodating groove 111 is provided with a plurality of first accommodating grooves 111 which are arranged along the axial direction of the rotating shaft 1 at intervals, so that the temperature detection of a plurality of positions of the permanent magnet 3 can be obtained, and furthermore, the obtained temperature result can be analyzed through an external data processing unit, so that the running condition of the motor can be more comprehensively known.

Preferably, axial limiting shaft sections 12 are respectively arranged at two axial ends of the magnetic conducting shaft section 11, the axial limiting shaft sections 12 and the magnetic conducting shaft section 11 are coaxially arranged, the difference between the axial diameters of the axial limiting shaft sections 12 and the magnetic conducting shaft section 11 is D, the thickness of the permanent magnet 3 is H, and D is 2H. At this moment, preferably, the motor rotor assembly further includes a protective sleeve 2, the protective sleeve 2 is sleeved on the outer peripheral side of the permanent magnet 3, further, the protective sleeve 2 and the outer peripheral side of the permanent magnet 3 are in interference fit, at this moment, the protective sleeve 2 can provide strong support for the permanent magnet 3 towards the axis direction of the rotating shaft 1, and the permanent magnet 3 is effectively prevented from being disconnected from the rotating shaft 1. Furthermore, the protective sleeve 2 may be a cylinder, and the material is preferably selected from non-magnetic conductive and non-magnetic-isolation materials, such as titanium alloy, nickel-based alloy, and the like, but not selected from magnetic conductive materials, so as to prevent the occurrence of iron loss phenomenon formed inside the magnetic conductive materials, and at the same time, the selection of the non-magnetic conductive materials is equivalent to increase the physical air gap between the stator and the rotor of the motor, so as to effectively improve the performance of the motor in other aspects.

Further, a second accommodating groove 121 is formed in one side, facing the permanent magnet 3, of the axial limiting shaft segment 12, the temperature detection component 4 is installed in the second accommodating groove 121, a third accommodating groove is formed in one side, facing the permanent magnet 3, of the protective sleeve 2, the temperature detection component 4 is installed in the third accommodating groove, and it can be understood that the signal transmission channels 5 respectively communicated with the second accommodating groove 121 and the third accommodating groove are also arranged at corresponding positions of the second accommodating groove and the third accommodating groove.

In order to facilitate the assembling and connecting process between the permanent magnet 3 and the rotating shaft 1, preferably, the permanent magnet 3 is tile-shaped, and the permanent magnet 3 has a plurality of, for example, 2 tile-shaped permanent magnets 3 with opposite polarities, which are symmetrically attached to the circumferential direction of the magnetic conductive shaft segment 11, as shown in fig. 3, of course, there may be other even numbers.

According to the utility model discloses an embodiment still provides a motor, especially a high-speed motor, including foretell motor rotor subassembly. The motor comprises a shell 9 and a stator 7 arranged in the shell 9, a motor rotor assembly is arranged in a stator hole of the stator 7, the motor further comprises end covers 8 arranged at two axial ends of the shell 9, the motor further comprises a signal receiving device 6 used for receiving a detection result signal sent by the temperature detection part 4, and the signal receiving device 6 is arranged on the stator 7 and/or the end covers 8 and/or the shell 9 of the motor.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a motor rotor subassembly, its characterized in that, includes pivot (1), pivot (1) has magnetic conduction shaft part (11), fixedly connected with permanent magnet (3) on magnetic conduction shaft part (11), still includes temperature detect part (4), the temperature sensing head contact of temperature detect part (4) the surface of permanent magnet (3).

2. The electric motor rotor assembly as claimed in claim 1, wherein the magnetic conductive shaft section (11) is configured with a first accommodating groove (111), and the temperature detecting member (4) is installed in the first accommodating groove (111).

3. The electric motor rotor assembly according to claim 2, wherein a signal transmission channel (5) is configured on the rotating shaft (1) to transmit a detection result signal of the temperature detection part (4) to a signal receiving device (6).

4. The electric machine rotor assembly according to claim 2, characterized in that the temperature detection means (4) comprises a wireless temperature sensor.

5. The electric machine rotor assembly according to claim 4, wherein the temperature detection means (4) further comprises a self-powered module for powering the wireless temperature sensor.

6. The electric machine rotor assembly as recited in claim 5, wherein the self-powered module includes a piezoelectric material.

7. The electric motor rotor assembly according to any one of claims 2 to 6, wherein the first receiving groove (111) has a plurality, and the plurality of first receiving grooves (111) are provided at intervals along an axial direction of the rotating shaft (1).

8. The motor rotor assembly according to claim 1, wherein the axial ends of the magnetic conductive shaft section (11) are respectively provided with an axial limiting shaft section (12), and the axial limiting shaft section (12) is coaxially arranged with the magnetic conductive shaft section (11).

9. The electric machine rotor assembly according to claim 8, characterized in that a second receiving groove (121) is formed in the side of the axial limit shaft segment (12) facing the permanent magnet (3), and the temperature detection member (4) is received in the second receiving groove (121).

10. The rotor assembly of the motor according to claim 8, further comprising a protective sleeve (2), wherein the protective sleeve (2) is sleeved on the outer periphery side of the permanent magnet (3).

11. The electric machine rotor assembly according to claim 10, wherein the protective sleeve (2) and the permanent magnet (3) are in interference fit with each other.

12. Rotor assembly according to claim 10, characterised in that the side of the protective sleeve (2) facing the permanent magnet (3) is configured with a third housing groove in which the temperature detection means (4) are housed.

13. The electric machine rotor assembly according to claim 1, characterized in that the permanent magnet (3) is tile-shaped, and the permanent magnet (3) has a plurality; and/or the permanent magnet (3) is bonded with the magnetic conduction shaft section (11).

14. The electric machine rotor assembly of claim 1, characterized in that the temperature sensing head contacts the inner surface of the permanent magnet (3).

15. An electric machine comprising an electric machine rotor assembly, wherein the electric machine rotor assembly is as claimed in any one of claims 1 to 14.

16. The machine according to claim 15, characterized by further comprising a signal receiving device (6) for receiving a detection result signal from the temperature detection member (4).

17. An electric machine according to claim 16, characterized in that the signal receiving means (6) is arranged on an end cover (8) and/or a stator (7) and/or a housing (9) provided with the electric machine.