CN216625525U - Permanent magnet motor capable of measuring rotor temperature - Google Patents
Permanent magnet motor capable of measuring rotor temperature Download PDFInfo
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- CN216625525U CN216625525U CN202123441928.8U CN202123441928U CN216625525U CN 216625525 U CN216625525 U CN 216625525U CN 202123441928 U CN202123441928 U CN 202123441928U CN 216625525 U CN216625525 U CN 216625525U
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Abstract
The utility model discloses a permanent magnet motor capable of measuring the temperature of a rotor. The permanent magnet motor capable of measuring the temperature of the rotor comprises a motor body with a casing, a rotor and a stator; the infrared temperature measuring probe is arranged on the shell; and the channel is arranged between the infrared temperature measuring probe and the rotor and is used for the infrared radiation to shuttle. The permanent magnet motor capable of measuring the temperature of the rotor can directly measure the temperature of the permanent magnet and/or the sheath of the rotor by utilizing the infrared temperature measuring probe and the channel, so that the temperature of the rotor can be monitored. The permanent magnet motor can realize non-contact measurement temperature detection on the rotor, and avoids the problems of contact measurement abrasion and poor contact, so that the permanent magnet motor is simple and convenient to operate, accurate in measurement and capable of adapting to different rotating speeds and different internal structures of the permanent magnet motor.
Description
Technical Field
The utility model relates to the field of motors, in particular to a permanent magnet motor capable of measuring the temperature of a rotor.
Background
The rotor temperature of the permanent magnet motor is related to the design parameters of the permanent magnet motor, and is also influenced by the control matching of a frequency converter, the cooling condition of a unit, the field environment, the operating condition and the like.
At present, a permanent magnet motor adopts a totally-enclosed structure, so that the heat dissipation inside the motor is not facilitated, and particularly the heat dissipation of a rotor is not facilitated. However, the higher the temperature of the permanent magnet of the rotor, the weaker the magnetism of the permanent magnet, and if the temperature exceeds the allowable working temperature, the permanent magnet will lose magnetism, and the motor performance and the operation reliability are affected. Therefore, it is necessary to accurately measure and monitor the temperature of the rotor permanent magnet or the sheath in real time during motor testing and field operation.
A common way of measuring the permanent magnet of a permanent magnet motor is to estimate the permanent magnet temperature by measuring the no-load back emf. Such measurement methods are not only time-delayed, but also inaccurate. Of course, there are also techniques to measure the rotor temperature by using a temperature sensor, for example, embedding a temperature sensor in the motor to extract the sensor signal out of the motor through the contact of a conductive slip ring or a brush, or placing a temperature sensor in a hole in the stator to estimate the rotor temperature by measuring the temperature near the air gap between the stator and the rotor. The embedded temperature sensor has the advantages of complex structure, poor maintainability, easy contact failure, easy signal interference, unstable measurement and other problems, and the slip ring is seriously worn when rotating at high speed, thus being not suitable for a high-speed permanent magnet motor. As for the measurement mode of drilling a hole in the stator and placing a temperature sensor, the tooth part of the stator core and the insulation of the stator winding are easily damaged, the requirement on the processing precision is high, and the temperature of the rotor cannot be directly measured, so the measurement precision is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a permanent magnet motor capable of measuring the rotor temperature, which can safely, conveniently, long-term and accurately detect or monitor the rotor temperature of the permanent magnet motor.
In order to achieve the above object, the present invention provides a permanent magnet motor capable of measuring a temperature of a rotor, comprising:
a motor body having a housing, a rotor, and a stator;
the infrared temperature measuring probe is arranged on the shell;
and the channel is arranged between the infrared temperature measuring probe and the rotor and used for allowing infrared radiation to shuttle.
Preferably, the motor body is a surface-mounted permanent magnet motor; the rotor comprises a permanent magnet, a rotor rotating shaft coaxially connected with the permanent magnet and a sheath sleeved on the permanent magnet and the rotor rotating shaft; the channel comprises a first channel arranged in the rotor rotating shaft and a second channel positioned between the shell and the rotor; the infrared temperature measuring probe comprises a first infrared temperature measuring probe used for aligning the permanent magnet along the first channel and a second infrared temperature measuring probe used for aligning the sheath along the second channel;
the first channel, the first infrared temperature measuring probe, the rotor rotating shaft and the permanent magnet are coaxially distributed;
the second channel is in a cavity between an inner wall of the housing and an outer wall of the sheath.
Preferably, the irradiation direction of the second infrared temperature measurement probe is intersected with the axial direction of the sheath.
Preferably, the rotor rotating shaft includes a first rotating shaft and a second rotating shaft located at both axial ends of the permanent magnet; the adjacent end faces of the first rotating shaft, the permanent magnet and the second rotating shaft are attached and fixed by gluing; the first channel is arranged in the first rotating shaft.
Preferably, the motor body is an embedded permanent magnet motor; the rotor comprises a rotor rotating shaft, a plurality of permanent magnets, a rotor iron core and a rotor pressing ring, wherein the permanent magnets are arranged in a surrounding mode and are attached to the rotor rotating shaft; the channels comprise a plurality of third channels arranged on the rotor pressing ring; the infrared temperature measuring probe comprises a third infrared temperature measuring probe which is used for aligning the permanent magnet along any third channel.
Preferably, all the third channels are uniformly distributed around the rotor rotating shaft as a central shaft.
Preferably, the end surface of any one of the third passages is in an oblong hole shape.
Preferably, the casing is provided with a probe mounting hole and a mounting hole plug; the probe mounting hole penetrates through the shell wall of the shell, and the infrared temperature measuring probe is detachably mounted in the probe mounting hole; the mounting hole plug is used for sealing and blocking the probe mounting hole when the infrared temperature measurement probe is detached from the casing.
Preferably, the probe mounting hole is a threaded hole; and external threads matched with the threads of the probe mounting hole are arranged on the peripheries of the infrared temperature measuring probe and the mounting hole plug.
Compared with the prior art, the permanent magnet motor capable of measuring the temperature of the rotor comprises a motor body, an infrared temperature measuring probe, a rotor arranged on the motor body and a channel of the infrared temperature measuring probe; in the permanent magnet motor capable of measuring the temperature of the rotor, a motor body comprises a shell and a stator besides the rotor; the infrared temperature measuring probe is arranged on the casing and keeps relative static with the casing.
Different types of motor bodies have different internal configurations, and therefore, the specific structure of the rotor differs for different types of motor bodies. Taking two different types of motor bodies, namely a surface-mounted permanent magnet motor and an embedded permanent magnet motor as an example, a rotor of the surface-mounted permanent magnet motor comprises a permanent magnet and a sheath, and a rotor of the embedded permanent magnet motor comprises the permanent magnet but no sheath, so that in the permanent magnet motor capable of measuring the temperature of the rotor, the specific position of a channel between an infrared temperature measuring probe and the rotor is flexibly arranged by combining the specific structure of the motor body. For example, the channel of the surface-mounted permanent magnet motor may be disposed between the permanent magnet and the infrared temperature probe, or between the sheath and the infrared temperature probe, or of course, the corresponding infrared temperature probes may be disposed for the permanent magnet and the sheath, and then the channels may be disposed respectively.
Therefore, the permanent magnet motor capable of measuring the temperature of the rotor takes the permanent magnet and/or the sheath as an object to be measured, non-contact measurement of the temperature of the rotor is realized by utilizing the infrared temperature measuring probe arranged on the casing and the channel arranged between the infrared temperature measuring probe and the object to be measured, the temperature of the permanent magnet and/or the sheath of the rotor can be directly measured and monitored, the temperature of the rotor is reflected by the temperature of specific parts of the rotor, the accuracy and the reliability are realized, and the problems of abrasion and poor contact of contact measurement are avoided.
When the permanent magnet motor capable of measuring the rotor temperature performs temperature measurement operation, the operation is simple and convenient, and the temperature measurement device can adapt to different rotating speeds and different internal structures of the permanent magnet motor, so that the whole product is safe and reliable, and the service life is long.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first permanent magnet motor capable of measuring a rotor temperature according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second permanent magnet motor capable of measuring a rotor temperature according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating operation of a permanent magnet machine capable of measuring rotor temperature according to an embodiment of the present invention;
fig. 4 is a partial operational flow diagram of a permanent magnet motor with a surface-mount permanent magnet motor capable of measuring rotor temperature according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating operation of a permanent magnet motor with an embedded permanent magnet motor to measure rotor temperature according to an embodiment of the present invention.
The motor comprises a permanent magnet 1, a protective sleeve 2, a second infrared temperature measuring probe 3, a first rotating shaft 4, a first infrared temperature measuring probe 5, a shaft end cover plate 6, a stator core 7, a housing main body 8, a second rotating shaft 9, a rotor core 10, a rotor pressing ring 11, a third infrared temperature measuring probe 12, a first channel 13, a third channel 14 and a rotor rotating shaft 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of a first permanent magnet motor capable of measuring a rotor temperature according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a second permanent magnet motor capable of measuring a rotor temperature according to an embodiment of the present invention; FIG. 3 is a flow chart illustrating operation of a permanent magnet machine capable of measuring rotor temperature according to an embodiment of the present invention; fig. 4 is a partial operational flow diagram of a permanent magnet motor with a surface-mount permanent magnet motor capable of measuring rotor temperature according to an embodiment of the present invention; fig. 5 is a flowchart illustrating operation of a permanent magnet motor with an embedded permanent magnet motor to measure rotor temperature according to an embodiment of the present invention.
The utility model provides a permanent magnet motor capable of measuring the temperature of a rotor, which comprises a motor body except a shell, the rotor and a stator; the device also comprises an infrared temperature measuring probe arranged on the casing and a channel arranged between the infrared temperature measuring probe and the rotor and used for the infrared radiation to shuttle.
In the permanent magnet motor capable of measuring the temperature of the rotor, the channel is used as an unobstructed space for infrared radiation to shuttle, is arranged between the rotor and the infrared temperature measuring probe, and can receive infrared radiation signals of the rotor by the infrared temperature measuring probe, so that the infrared temperature measuring probe can measure the infrared radiation signals of the rotor.
Because different types of motor bodies have rotors with different shapes and structures, for example, the rotor of the surface-mounted permanent magnet motor comprises the permanent magnet 1 and the sheath 2, and the rotor of the embedded permanent magnet motor comprises the permanent magnet 1 but no sheath 2, when the infrared temperature probe is used for detecting the infrared radiation signal of the rotor, the infrared temperature probe can be used for detecting the infrared radiation signal of the permanent magnet 1, and the infrared temperature probe can also be used for detecting the infrared radiation signal of the sheath 2. Obviously, when the infrared temperature measuring probe detects the infrared radiation signal of the rotor, the channel is arranged between the infrared temperature measuring probe and the permanent magnet 1; when the infrared temperature measuring probe detects the infrared radiation signal of the sheath 2, the channel is arranged between the infrared temperature measuring probe and the sheath 2. Since the permanent magnet 1 and the sheath 2 are parts of the rotor, the temperature of the rotor can be reflected whether the temperature of the permanent magnet 1 or the temperature of the sheath 2 is detected or whether the temperature of the permanent magnet 1 and the temperature of the sheath 2 are detected respectively. Therefore, in this embodiment, the specific location of the channel between the infrared thermometric probe and the rotor should be flexibly configured in combination with the specific shape of the rotor.
As for the stator of the motor body, the stator may include the stator core 7 and other components, and reference may be made to the prior art, which will not be described in detail herein.
In summary, the permanent magnet motor capable of measuring the temperature of the rotor provided by the utility model utilizes the infrared temperature measuring probe and the channel to realize non-contact temperature measurement on the permanent magnet 1 and/or the sheath 2 of the rotor, the temperature of the rotor is reflected by the temperature of the permanent magnet 1 and/or the temperature of the sheath 2, and the problems of contact measurement abrasion and poor contact are avoided, so that the permanent magnet motor can adapt to low, medium and high rotation speeds of all stages and different internal structures of different motors.
In addition, the temperature of the parts of the rotor can be directly detected by the permanent magnet motor capable of measuring the temperature of the rotor, so that compared with the situation that the temperature of the rotor is indirectly fed back by utilizing the temperatures of other parts except the rotor in the permanent magnet motor, the temperature measurement result is more accurate and reliable, and the operation safety and reliability of the motor are favorably improved.
The present invention provides a permanent magnet motor capable of measuring the temperature of a rotor, which is further described with reference to the accompanying drawings and embodiments.
The motor body of the permanent magnet motor capable of measuring the temperature of the rotor can be a surface-mounted permanent magnet motor, and the rotor of the surface-mounted permanent magnet motor comprises a permanent magnet 1, a rotor rotating shaft 15 coaxially connected with the permanent magnet and a sheath 2 sleeved with the permanent magnet and the rotor rotating shaft 15, so that in the embodiment, the infrared temperature measuring probe can comprise a first infrared temperature measuring probe 5 for detecting the temperature of the permanent magnet and a second infrared temperature measuring probe 3 for detecting the temperature of the sheath 2; correspondingly, in the embodiment, the channels comprise a first channel 13 arranged between the first infrared temperature measuring probe 5 and the permanent magnet 1 and a second channel arranged between the second infrared temperature measuring probe 3 and the sheath 2.
The first channel 13 is arranged in the rotor rotating shaft 15 and is coaxially distributed with the first infrared temperature measuring probe 5, the rotor rotating shaft 15 and the permanent magnet, so that the first infrared temperature measuring probe 5 and the permanent magnet 1 are respectively exposed at two axial ends of the first channel 13.
The permanent magnet 1 is arranged in a generally cylindrical shape, so that the permanent magnet 1 and the rotor shaft 15 are coaxially connected and form a magnetic steel shaft, and the sheath 2 is wound around the magnetic steel shaft or sleeved on the magnetic steel shaft as a sleeve-shaped integral part.
Since the central axis of the rotor shaft 15 coincides with the central axis of the permanent magnet motor capable of measuring the temperature of the rotor, therefore, the permanent magnet 1, the first channel 13 and the first infrared temperature probe 5 of the surface-mounted permanent magnet motor are all positioned on the straight line where the central axis of the rotor rotating shaft 15 is positioned, in other words, the permanent magnet 1, the first channel 13 and the first infrared temperature probe 5 of the surface-mounted permanent magnet motor can be always collinear in the whole working cycle of the surface-mounted permanent magnet motor, this means that the first infrared temperature measuring probe 5 is started at any time in the aforementioned operation cycle, the first infrared temperature measuring probe 5 always uses and only uses the permanent magnet 1 of the surface-mounted permanent magnet motor as the measured object, therefore, no matter which sampling frequency the first infrared temperature measuring probe 5 works with, the infrared radiation signal obtained by the first infrared temperature measuring probe 5 is always the infrared radiation signal of the permanent magnet 1 of the surface-mounted permanent magnet motor.
The second channel is located in a cavity between the inner wall of the casing and the outer wall of the sheath 2, so that the second infrared temperature measuring probe 3 and the sheath 2 are respectively exposed at two axial ends of the second channel. According to the specific installation relation of the sheath 2 in the surface-mounted permanent magnet motor, the second infrared temperature measuring probe 3 can use the axial end face of the sheath 2 as a region to be measured, and can also use the peripheral wall of the sheath 2 as the region to be measured.
Considering that the sheath 2 is a thin-wall cylindrical structure, in the embodiment provided by the utility model, the outer peripheral wall of the sheath 2 is preferentially taken as the region to be measured, so that the irradiation direction of the second infrared temperature measurement probe 3 is intersected with the axial direction of the sheath 2, and the second infrared temperature measurement probe 3 is aligned with the outer peripheral wall of the sheath 2.
Compared with the first channel 13, the second channel belongs to a local cavity formed by assembling a plurality of parts of the surface-mounted permanent magnet motor, and the local cavity is not blocked by a barrier, so that the transmission of infrared radiation signals between the sheath 2 and the second infrared temperature measuring probe 3 can be realized.
As shown in fig. 1, the housing of the surface-mount permanent magnet motor may include a cylindrical housing main body 8 and a shaft end cover plate 6 disposed at the center of an axial end face of the housing main body 8; the first infrared temperature measuring probe 5 is disposed on the shaft end cover plate 6, and the second infrared temperature measuring probe 3 is disposed on the axial end face of the casing main body 8 and is deviated from the shaft end cover plate 6.
Further, in order to facilitate the arrangement of the first channel 13 in the rotor rotating shaft 15, in the above embodiment, the rotor rotating shaft 15 of the surface-mounted permanent magnet motor may include the first rotating shaft 4 and the second rotating shaft 9 located at both axial ends of the permanent magnet 1; the adjacent end faces of the first rotating shaft 4, the permanent magnet 1 and the second rotating shaft 9 are attached and fixed by a strong adhesive. The first channel 13 is disposed in the first rotating shaft 4, in other words, the first rotating shaft 4 is a hollow shaft, whereas the second rotating shaft 9 is a solid shaft. Obviously, the infrared temperature probe is close to the first rotating shaft 4 and far from the second rotating shaft 9.
Besides the surface-mounted permanent magnet motor serving as the motor body, the permanent magnet motor capable of measuring the rotor temperature provided by the utility model can also be used as an embedded permanent magnet motor serving as the motor body.
The rotor of the embedded permanent magnet motor comprises a rotor rotating shaft 15, a plurality of permanent magnets 1 which are arranged in an enclosing mode and attached to the rotor rotating shaft 15, a rotor core 10 sleeved outside the permanent magnets 1 and a rotor pressing ring 11 which encapsulates all the permanent magnets 1 along the axial end portion of the rotor core 10; correspondingly, the permanent magnet motor capable of measuring the temperature of the rotor is provided with a third infrared temperature measuring probe 12 for detecting the temperature of the permanent magnet 1, and the channel comprises a third channel 14 arranged in the rotor pressing ring 11. Obviously, the permanent magnet 1 and the third infrared thermometric probe 12 are exposed to both ends of the third channel 14, respectively.
The permanent magnet 1 of the embedded permanent magnet motor needs to utilize the rotor pressing ring 11 to realize positioning constraint, the permanent magnet 1 is not located on the central axis of the rotor rotating shaft 15, in order to meet the positioning requirement of the rotor pressing ring 11 on the permanent magnet 1 and the temperature detection requirement of the third infrared temperature measuring probe 12 on the permanent magnet 1, a plurality of third channels 14 which are annularly distributed by taking the rotor rotating shaft 15 as the center are arranged in the rotor pressing ring 11, a circular area formed by all the third channels 14 is just aligned with the permanent magnet 1, any one third channel 14 is equivalent to a hole penetrating through the rotor pressing ring 11, the structural integrity of the rotor pressing ring 11 can be prevented from being damaged, the permanent magnet is effectively positioned and constrained by the rotor pressing ring 11, and the temperature detection of the permanent magnet 1 in a rotating state can be carried out by the third infrared temperature measuring probe 12. In other words, the rotor pressing ring 11 can position and clamp the permanent magnet 1 by using a local region without a hole, and can align the third infrared temperature measurement probe 12 with the permanent magnet 1 by using the third channel 14 formed by processing a hole.
Illustratively, N holes penetrating through the rotor pressing ring 11 are formed in the rotor pressing ring 11 to serve as third channels 14, and meanwhile, a third infrared temperature measuring probe 12 is arranged on the machine shell; the permanent magnet 1 and the third infrared temperature measuring probe 12 arranged on the shell are exposed at two ends of any one third channel 14. Any one third channel 14 penetrates along the axial direction of the rotor pressing ring 11, and all the third channels 14 are distributed in a circular array by taking the middle point of the rotor pressing ring 11 as the center.
Compared with the first infrared temperature measuring probe 5 and the second infrared temperature measuring probe 3 of the surface-mounted permanent magnet motor which can be continuously and uninterruptedly aligned with the permanent magnet 1 and the sheath 2 of the surface-mounted permanent magnet motor, the third infrared temperature measuring probe 12 of the embedded permanent magnet motor can be aligned with the permanent magnet 1 of the embedded permanent magnet motor only when the third channel 14 rotates to a specific angle. The third channel 14 rotates to a specific angle, that is, the rotor pressing ring 11 rotates to any one third channel 14 to be collinear with the third infrared temperature measuring probe 12 and the permanent magnet 1 of the embedded permanent magnet motor. Therefore, the third infrared temperature measuring probe 12 needs to be enabled to collect infrared radiation signals when being aligned with and only being aligned with the permanent magnet 1 of the interior permanent magnet motor, and the collection of the infrared radiation signals is stopped when the third infrared temperature measuring probe 12 is aligned with the rotor pressing ring 11, so that the third infrared temperature measuring probe 12 is prevented from detecting the temperature of other parts except the permanent magnet 1.
As for the way of acquiring the infrared radiation signal when the third infrared temperature measuring probe 12 is aligned with the permanent magnet 1 and stopping acquiring the infrared radiation signal when the third infrared temperature measuring probe is aligned with the rotor pressing ring 11, the acquisition frequency of the infrared temperature measuring probe can be M times (M is a divisor of N) the rotation frequency of the rotor pressing ring 11 by adjusting the sampling frequency of the third infrared temperature measuring probe 12 and the frequency interval of the third channel 14 on the rotor pressing ring 11, and the infrared temperature measuring probe is started when the infrared temperature measuring probe is aligned with one of the third channels 14.
Of course, since the rotation speed of the rotor pressing ring 11 is not adjustable, the frequency interval of the third channel 14 on the rotor pressing ring 11 can be adjusted by adjusting the number and relative position of the third channels 14 of the rotor pressing ring 11. For example, when the rotor clamping ring 11 has four third channels 14 uniformly distributed thereon, and the rotor clamping ring 11 is at T3Time to T4When the time is just rotated for one circle, every other (T)4-T3) And 4, in two adjacent third channels 14, the last third channel 14 rotates to the position of the last third channel 14, in other words, the frequency interval of the third channel 14 on the rotor pressing ring 11 is 4/(T)4-T3) Suitably, the third infrared temperature probe 12 is at T3Aligned in time with exactly one third channel 14 and collecting the infrared radiation signal, then at T3Time to T4The infrared radiation signals are collected four times at equal time intervals between moments. Where "four" of the four third channels 14 correspond to N above and "four" of the four acquisitions correspond to M above.
In the above embodiment, the end surface of any one third channel 14 is in the shape of a long circular hole, which is not only beneficial for the infrared temperature measuring probe to collect the infrared radiation signal of the permanent magnet 1, but also capable of effectively restraining the permanent magnet 1 and preventing the permanent magnet 1 from separating from the rotor rotating shaft 15 from one side of the rotor pressing ring 11.
Furthermore, in the permanent magnet motor capable of measuring the temperature of the rotor, the shell is also provided with a probe mounting hole and a mounting hole plug; the probe mounting hole penetrates through the shell wall of the shell, and the infrared temperature measuring probe is detachably mounted in the probe mounting hole; the mounting hole plug is used for sealing and blocking the probe mounting hole when the infrared temperature measurement probe is detached from the machine shell.
The probe mounting hole is detachably connected with the infrared temperature measuring probe, and the probe mounting hole is in interference fit with an infrared temperature measuring probe shaft hole or locked by threads.
The probe mounting hole and the infrared temperature measuring probe are locked by screw threads. The probe mounting hole is the screw hole, and infrared temperature probe is the column and the periphery is equipped with the external screw thread, when carrying out the temperature measurement operation, revolves infrared temperature probe soon in the probe mounting hole, realizes the probe mounting hole and infrared temperature probe two relatively fixed. After the temperature measurement operation is finished, the infrared temperature measurement probe is detached and taken down from the probe mounting hole, and then the mounting hole plug, such as a threaded sealing plug, is arranged in the probe mounting hole, so that the probe mounting hole is sealed and plugged. Obviously, the periphery of the thread sealing plug is provided with an external thread matched with the threaded hole.
It can be seen that whether the probe mounting holes are plugged by parts such as the threaded sealing plug before and after temperature measurement operation or by the infrared temperature measurement probe during temperature measurement operation, a plurality of parts in the casing are almost in the same fully-closed sealing space, so that a safer and more reliable operation environment can be provided for the parts in the permanent magnet motor.
For any of the above-mentioned embodiments, the rotor temperature measurement operation can be implemented according to the following steps:
s1: a permanent magnet 1 and/or a sheath 2 are/is used as an object to be measured, and a channel is arranged between the object to be measured and an infrared temperature measuring probe arranged on a shell;
s2: and starting the infrared temperature measuring probe at a preset sampling frequency.
The purpose of adopting the infrared temperature measurement probe to measure the temperature of the rotor of the permanent magnet motor is to obtain the temperature of the rotor of the permanent magnet motor, and the difference of the rotor structures of different types of permanent magnet motors is considered, so that for a specific permanent magnet motor, if the rotor of the permanent magnet motor is provided with the permanent magnet 1 and the sheath 2 at the same time, channels can be respectively arranged between the infrared temperature measurement probe and the permanent magnet 1 and between the infrared temperature measurement probe and the sheath 2, in other words, the permanent magnet 1 and the sheath 2 of the permanent magnet motor are both used as objects to be measured; if the rotor of the permanent magnet motor is provided with the permanent magnet 1 but not provided with the sheath 2, obviously, the channel is arranged between the infrared temperature measuring probe and the permanent magnet 1, and the permanent magnet 1 of the permanent magnet motor is used as an object to be measured.
For different types of permanent magnet motors, when the rotor of the permanent magnet motor rotates due to the starting of the permanent magnet motor, the object to be detected, the channel and the infrared temperature measuring probe can be collinear all the time in the whole operation period of the permanent magnet motor, and can also be collinear intermittently in the whole operation period of the permanent magnet motor.
The object to be measured belongs to one of the parts of the rotor, therefore, the object to be measured rotates along with the rotation of the rotor, and the infrared temperature measuring probe is arranged on the machine shell, therefore, the infrared temperature measuring probe and the machine shell keep relatively static. Of course, the infrared temperature measuring probe can also be mounted on other casing parts which are relatively static with the casing, such as a bearing seat, an oil seal, a mounting rack and the like of the permanent magnet motor.
When the object to be measured, the channel and the infrared temperature measuring probe are collinear all the time in the whole operation period of the permanent magnet motor, the object to be measured, the channel and the infrared temperature measuring probe are all positioned on a straight line where a central shaft of the rotor is positioned; when the object to be measured, the channel and the infrared temperature measuring probe are intermittently collinear in the whole operation period of the permanent magnet motor, at least one of the object to be measured, the channel and the infrared temperature measuring probe is not positioned on a straight line where a central shaft of the rotor is positioned. The purpose of starting the infrared temperature measurement probe with the preset sampling frequency is just to start the infrared temperature measurement probe to acquire an infrared radiation signal if and only if the object to be measured, the channel and the infrared temperature measurement probe are collinear, in other words, to ensure that the infrared temperature measurement probe only acquires the temperature of the object to be measured.
In order to perform the temperature measurement operation more reasonably in different stages of assembly, use, maintenance and the like of the permanent magnet motor, the step S1 may further include:
s01: the infrared temperature measurement probe is detachably fixed in a probe mounting hole of the machine shell;
accordingly, after step S2, the method further includes:
s3: and (4) detaching the infrared temperature measurement probe from the machine shell, and sealing and blocking the probe mounting hole.
After the probe mounting hole is sealed and plugged according to the operation, before and after temperature measurement operation and in the temperature measurement operation, a plurality of parts in the casing are almost in the same fully-closed sealed space, so that a safer and more reliable operation environment is provided for the parts in the permanent magnet motor.
The specific temperature measurement steps will be described in detail below by taking the motor bodies of the permanent magnet motor capable of measuring the rotor temperature as a surface-mounted permanent magnet motor and an embedded permanent magnet motor respectively as examples.
The rotor of the surface-mounted permanent magnet motor includes a permanent magnet 1 and a sheath 2, and accordingly, the step S1 may include:
s11: taking a permanent magnet 1 of a surface-mounted permanent magnet motor as an object to be measured, and arranging a first channel 13 extending in the same direction as a rotor rotating shaft 15 in the rotor rotating shaft 15 of the surface-mounted permanent magnet motor; the permanent magnet 1 and the first infrared temperature measuring probe 5 arranged on the machine shell are exposed at two ends of the first channel 13.
The surface-mounted permanent magnet motor comprises a permanent magnet 1, a rotor rotating shaft 15 and a sheath 2 sleeved outside the permanent magnet 1 and the rotor rotating shaft 15, and therefore the permanent magnet 1 and the rotor rotating shaft 15 which are jointly arranged in the sheath 2 are both positioned on a straight line where a rotor central shaft of the surface-mounted permanent magnet motor is positioned. At this time, a first channel 13 may be formed by opening a hole in the rotor shaft 15, and the first infrared temperature probe 5 may be installed at the intersection of the straight line and the casing.
The first passage 13 extends in the axial direction of the rotor shaft 15; one end of the first channel 13 faces the first infrared temperature measuring probe 5 on the casing, and the other end faces the permanent magnet 1, that is, the first infrared temperature measuring probe 5 is exposed at one end of the first channel 13, the permanent magnet 1 is exposed at the other end of the first channel 13, and the permanent magnet 1, the first channel 13 and the first infrared temperature measuring probe 5 of the surface-mounted permanent magnet motor are all located on a straight line where a rotor center shaft of the surface-mounted permanent magnet motor is located. Aiming at the structure, the first infrared temperature measuring probe 5 can realize signal acquisition for many times at any preset sampling frequency in the whole operation period of the surface-mounted permanent magnet motor. For example, surface-mounted permanent magnet machines at T1Time to T2The first infrared temperature measuring probe 5 can be started within the time T1Time to T2N signal acquisitions (N =1,2,3 … …) are regularly carried out within a time instant, possibly also at T1Time to T2Irregularly implementing N times within a timeSignal acquisition (N =1,2,3 … …).
Further, the step S1 may further include:
s12: taking a sheath 2 of the surface-mounted permanent magnet motor as an object to be measured, and reserving an unobstructed space between the sheath 2 and the second infrared temperature probe 3 to be used as a second channel when the shell and the second infrared temperature probe 3 are assembled; the irradiation direction of the second infrared temperature measuring probe 3 is crossed with the axial direction of the sheath 2.
Therefore, when the temperature of the rotor of the surface-mounted permanent magnet motor is measured, the permanent magnet and the sheath 2 of the surface-mounted permanent magnet motor can be used as objects to be measured, and the temperatures of the permanent magnet and the sheath 2 can be detected by the first infrared temperature measuring probe 5 and the second infrared temperature measuring probe 3 respectively.
When measuring the rotor temperature of the interior permanent magnet motor, the rotor of the interior permanent magnet motor includes the permanent magnet 1, and therefore, the step S1 may include:
the permanent magnet 1 of the embedded permanent magnet motor is used as an object to be measured, and N third channels 14 which are annularly distributed by taking a rotor rotating shaft 15 as a center are formed in a rotor pressing ring 11 of the embedded permanent magnet motor; the permanent magnet 1 and the third infrared temperature measuring probe 12 arranged on the shell are exposed at two ends of any third channel 14;
accordingly, step S2 may include:
s21: setting the acquisition frequency of the infrared temperature measurement probe to be M times (M is a divisor of N) of the rotation frequency of the rotor pressing ring 11;
s22: the infrared temperature probe is turned on when it is aligned with one of the third channels 14.
The specific operations of S21 and S22 can refer to the above detailed description, and are not repeated here.
The present invention provides a permanent magnet motor capable of measuring the temperature of a rotor. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A permanent magnet electric machine capable of measuring rotor temperature, comprising:
a motor body having a housing, a rotor, and a stator;
the infrared temperature measuring probe is arranged on the shell;
and the channel is arranged between the infrared temperature measuring probe and the rotor and is used for the infrared radiation to shuttle.
2. The permanent magnet motor capable of measuring the rotor temperature according to claim 1, wherein the motor body is a surface-mounted permanent magnet motor; the rotor comprises a permanent magnet (1), a rotor rotating shaft (15) coaxially connected with the permanent magnet (1) and a sheath (2) sleeved with the permanent magnet (1) and the rotor rotating shaft (15); the channels comprise a first channel (13) arranged in the rotor rotating shaft (15) and a second channel positioned between the machine shell and the rotor; the infrared temperature measuring probe comprises a first infrared temperature measuring probe (5) aligned with the permanent magnet (1) along the first channel (13) and a second infrared temperature measuring probe (3) aligned with the sheath (2) along the second channel;
the first channel (13), the first infrared temperature measuring probe (5), the rotor rotating shaft (15) and the permanent magnet (1) are coaxially distributed;
the second channel is located in a cavity between the inner wall of the housing and the outer wall of the jacket (2).
3. The permanent magnet motor capable of measuring the rotor temperature according to claim 2, wherein the irradiation direction of the second infrared temperature measuring probe (3) is intersected with the axial direction of the sheath (2).
4. The permanent magnet motor capable of measuring rotor temperature according to claim 2, wherein the rotor rotating shaft (15) comprises a first rotating shaft (4) and a second rotating shaft (9) which are positioned at two axial ends of the permanent magnet (1); the adjacent end faces of the first rotating shaft (4), the permanent magnet (1) and the second rotating shaft (9) are attached and fixed by gluing; the first channel (13) is arranged in the first rotating shaft (4).
5. The permanent magnet motor capable of measuring the rotor temperature according to claim 1, wherein the motor body is an in-line permanent magnet motor; the rotor comprises a rotor rotating shaft (15), a plurality of permanent magnets (1) which are arranged in an enclosing manner and are attached to the rotor rotating shaft (15), a rotor iron core (10) sleeved outside the permanent magnets (1) and a rotor pressing ring (11) which encapsulates all the permanent magnets (1) along the axial end part of the rotor iron core (10); the channels comprise a plurality of third channels (14) arranged on the rotor pressing ring (11); the infrared temperature measuring probe comprises a third infrared temperature measuring probe (12) which is used for aligning the permanent magnet (1) along any third channel (14).
6. The permanent magnet motor capable of measuring the rotor temperature as claimed in claim 5, wherein all the third channels (14) are uniformly distributed around the rotor rotating shaft (15).
7. The permanent magnet motor capable of measuring the rotor temperature as claimed in claim 6, wherein the end surface of any one of the third channels (14) is in the shape of a long round hole.
8. The permanent magnet motor capable of measuring the temperature of the rotor according to any one of claims 1 to 7, wherein the casing is provided with a probe mounting hole and a mounting hole plug; the probe mounting hole penetrates through the shell wall of the shell, and the infrared temperature measuring probe is detachably mounted in the probe mounting hole; the mounting hole plug is used for sealing and blocking the probe mounting hole when the infrared temperature measuring probe is detached from the casing.
9. The permanent magnet motor capable of measuring the rotor temperature according to claim 8, wherein the probe mounting hole is a threaded hole; and external threads matched with the threads of the probe mounting hole are arranged on the peripheries of the infrared temperature measuring probe and the mounting hole plug.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123441928.8U CN216625525U (en) | 2021-12-31 | 2021-12-31 | Permanent magnet motor capable of measuring rotor temperature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123441928.8U CN216625525U (en) | 2021-12-31 | 2021-12-31 | Permanent magnet motor capable of measuring rotor temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114157104A (en) * | 2021-12-31 | 2022-03-08 | 湖南中车尚驱电气有限公司 | Permanent magnet motor rotor temperature measuring method and permanent magnet motor capable of measuring rotor temperature |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114157104A (en) * | 2021-12-31 | 2022-03-08 | 湖南中车尚驱电气有限公司 | Permanent magnet motor rotor temperature measuring method and permanent magnet motor capable of measuring rotor temperature |
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