Permanent magnet motor

Abstract

The utility model provides a permanent magnet motor. The rear end cover assembly and the front end cover assembly are arranged at the rear end and the front end of the stator assembly respectively, the rotor assembly is rotatably arranged in the stator assembly, the rotating shaft penetrates through the rotor assembly and extends out of the rear end cover assembly and the front end cover assembly, the electric brush is arranged on the rear end cover assembly, the temperature sensor is arranged on the rotor assembly, and the rotating shaft is provided with a connecting wire channel. One end of the signal connecting line penetrates through the connecting line channel to be connected with the temperature sensor, the other end of the signal connecting line is connected with the signal transmission line through the electric brush, the temperature sensor can detect the temperature of the rotor assembly in real time, and the temperature sensor can transmit a detected temperature signal to the signal transmission line through the signal connecting line, so that the temperature sensor can detect the temperature of the rotor assembly in real time. A worker can accurately obtain the working temperature of the rotor assembly, and when the temperature is too high, rotation of the permanent magnet motor is stopped, so that a demagnetization fault of the permanent magnet of the rotor caused by temperature rise is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a permanent magnet motor. Background Art

[0002] When a permanent magnet synchronous motor is running, the temperature of its rotor will rise due to eddy current loss and hysteresis loss, etc. And there is a risk that the permanent magnet of the rotor will be demagnetized due to too high temperature rise. Therefore, detecting the temperature of the rotor of a permanent magnet synchronous motor is very important for ensuring the safe and stable operation of the motor. Summary of the Utility Model

[0003] In view of this, the embodiment of the utility model provides a permanent magnet motor to solve the problem that the permanent magnet of the rotor of the existing permanent magnet motor has a risk of demagnetization failure due to too high temperature rise.

[0004] To achieve the above object, the embodiment of the utility model provides the following technical solutions:

[0005] A permanent magnet motor, comprising: a stator assembly, a front end cover assembly, a rear end cover assembly, a rotor assembly, a rotating shaft, a temperature sensor, a brush and a signal connecting wire;

[0006] The rear end cover assembly and the front end cover assembly are respectively arranged at the rear end and the front end of the stator assembly;

[0007] The rotor assembly is rotatably arranged in the stator assembly;

[0008] The rotating shaft passes through the rotor assembly and extends out from the rear end cover assembly and the front end cover assembly;

[0009] The brush is arranged on the rear end cover assembly;

[0010] The temperature sensor is arranged on the rotor assembly;

[0011] A connecting wire channel is formed in the rotating shaft;

[0012] One end of the signal connecting wire passes through the connecting wire channel and is connected to the temperature sensor, and the other end is connected to the signal transmission line through the brush.

[0013] Preferably, the connecting wire channel includes: a first sub-channel and a second sub-channel;

[0014] The first sub-channel is formed along the axial direction of the rotating shaft;

[0015] The second sub-channel is formed along the radial direction of the rotating shaft and is communicated with the first sub-channel.

[0016] Preferably, a plurality of second sub-channels are formed along the axial direction of the rotating shaft;

[0017] The temperature sensors are multiple.

[0018] Preferably, the first sub-channel is coaxial with the rotating shaft.

[0019] Preferably, the second sub-channel is arranged at a preset angle with respect to the first sub-channel.

[0020] Preferably, the carbon brush includes a slip ring stator and a slip ring rotor disposed within the slip ring stator.

[0021] Preferably, the rotor assembly includes a permanent magnet;

[0022] The temperature sensor is disposed on the permanent magnet.

[0023] As can be seen from the above, the present utility model discloses a permanent magnet motor. The rear end cover assembly and the front end cover assembly are respectively disposed at the rear end and the front end of the stator assembly, and the rotor assembly is rotatably disposed within the stator assembly. The rotating shaft passes through the rotor assembly and protrudes from the rear end cover assembly and the front end cover assembly. The carbon brush is disposed on the rear end cover assembly, and the temperature sensor is disposed on the rotor assembly. The rotating shaft is provided with a connection line channel. One end of the signal connection line passes through the connection line channel and is connected to the temperature sensor, and the other end is connected to the signal transmission line through the carbon brush. Through the above-disclosed permanent magnet motor, since the temperature sensor is disposed on the rotor assembly, the temperature sensor can detect the temperature of the rotor assembly in real time. And since the temperature sensor of the present application can transmit the detected temperature signal to the signal transmission line through the signal connection line, the staff can accurately obtain the temperature of the rotor assembly during operation. When the temperature is too high, the rotation of the permanent magnet motor is stopped, thereby avoiding the demagnetization failure of the permanent magnet of the rotor due to the increase in temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of a permanent magnet motor provided by an embodiment of the present utility model;

[0026] Figure 2 It is a schematic structural diagram of the rotating shaft provided by an embodiment of the present utility model;

[0027] Figure 3 It is a schematic diagram of temperature signal transmission provided by an embodiment of the present utility model.

[0028] Among them, there are a stator assembly 1, a front end cover assembly 2, a rear end cover assembly 3, a rotor assembly 4, a permanent magnet 41, a rotating shaft 5, a first sub-channel 51, a second sub-channel 52, a temperature sensor 6, a slip ring stator 71, a slip ring rotor 72, a signal connection wire 8, and a signal transmission line 9. Detailed implementation

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] In this application, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0031] An embodiment of the present invention provides a permanent magnet motor. Refer to Figure 1 and Figure 2 , Figure 1 which is a structural schematic diagram of the permanent magnet motor. The permanent magnet motor includes: a stator assembly 1, a front end cover assembly 2, a rear end cover assembly 3, a rotor assembly 4, a rotating shaft 5, a temperature sensor 6, a brush, and a signal connection wire 8;

[0032] The rear end cover assembly 3 and the front end cover assembly 2 are respectively arranged at the rear end and the front end of the stator assembly 1;

[0033] The rotor assembly 4 is rotatably arranged inside the stator assembly 1;

[0034] The rotating shaft 5 passes through the rotor assembly 4 and extends out from the rear end cover assembly 3 and the front end cover assembly 2;

[0035] The brush is arranged on the rear end cover assembly 3;

[0036] The temperature sensor 6 is arranged on the rotor assembly 4;

[0037] The rotating shaft 5 is provided with a connection wire channel;

[0038] One end of the signal connection wire 8 passes through the connection wire channel and is connected to the temperature sensor 6, and the other end is connected to the signal transmission line 9 through the brush.

[0039] In the embodiment of the present utility model, the rear end cover assembly 3 and the front end cover assembly 2 are respectively arranged at the rear end and the front end of the stator assembly 1, and the rotor assembly 4 is rotatably arranged inside the stator assembly 1. The rotating shaft 5 passes through the rotor assembly 4 and protrudes from the rear end cover assembly 3 and the front end cover assembly 2. The carbon brush is arranged on the rear end cover assembly 3, the temperature sensor 6 is arranged on the rotor assembly 4, a connecting wire channel is provided on the rotating shaft 5, one end of the signal connecting wire 8 passes through the connecting wire channel and is connected to the temperature sensor 6, and the other end is connected to the signal transmission line 9 through the carbon brush. Through the above-disclosed permanent magnet motor, since the temperature sensor 6 is arranged on the rotor assembly 4, the temperature sensor 6 can detect the temperature of the rotor assembly 4 in real time. And since the temperature sensor 6 of the present application can transmit the detected temperature signal to the signal transmission line 9 through the signal connecting wire 8, the staff can accurately obtain the temperature of the rotor assembly 4 during operation. When the temperature is too high, the rotation of the permanent magnet motor is stopped, thereby avoiding the demagnetization failure of the permanent magnet 41 of the rotor due to the temperature rise.

[0040] Specifically, it is characterized in that the connecting wire channel includes: a first sub-channel 51 and a second sub-channel 52;

[0041] The first sub-channel 51 is opened along the axial direction of the rotating shaft 5;

[0042] The second sub-channel 52 is opened along the radial direction of the rotating shaft 5 and is communicated with the first sub-channel 51.

[0043] It should be noted that by opening the first sub-channel 51 along the axial direction of the rotating shaft 5, and opening the second sub-channel 52 along the radial direction of the rotating shaft 5 and communicating it with the first sub-channel 51, one end of the signal connecting wire 8 can sequentially pass through the first sub-channel 51 and the second sub-channel to be connected to the temperature sensor 6, while the other end is connected to the carbon brush.

[0044] Specifically, a plurality of second sub-channels 52 are opened along the axial direction of the rotating shaft 5;

[0045] The temperature sensors 6 are multiple.

[0046] It should be noted that by arranging a plurality of temperature sensors 6 and opening a plurality of second sub-channels 52 along the axial direction of the rotating shaft 5, the temperature of different positions of the rotor assembly 4 can be detected in real time by the plurality of temperature sensors 6, avoiding the demagnetization failure caused by the local overheating of the rotor assembly 4.

[0047] Furthermore, the first sub-channel 51 is coaxial with the rotating shaft 5.

[0048] It should be noted that setting the first sub-channel 51 coaxial with the rotating shaft 5 can not only ensure the stiffness of the rotating shaft 5, but also reduce the wobbling of the rotating shaft 5 during rotation.

[0049] Specifically, the second sub-channel 52 is arranged at a preset angle with respect to the first sub-channel 51.

[0050] It should be noted that the preset angle can be 90°, 110°, or 45°. Those skilled in the art can choose according to requirements.

[0051] Preferably, the preset angle is from 90° to 150°.

[0052] It should be noted that by setting the preset angle from 90° to 150°, when the signal connection line 8 transitions from the first sub-channel 51 to the second sub-channel 52, the problem of signal transmission obstruction due to bending transition of the signal connection line 8 can be avoided.

[0053] Specifically, the brush includes a slip ring stator 71 and a slip ring rotor 72 disposed within the slip ring stator 71.

[0054] It should be noted that the slip ring rotor 72 rotates synchronously with the rotating shaft 5. By cooperating with the slip ring stator 71, the slip ring rotor 72 can transmit the signals transmitted by the plurality of temperature sensors 6 to the signal transmission line 9, and finally transmit them to an external device for display.

[0055] Specifically, the rotor assembly 4 includes a permanent magnet 41;

[0056] The temperature sensor 6 is disposed on the permanent magnet 41.

[0057] It should be noted that the temperature sensor 6 can be disposed directly on the permanent magnet 41 to directly detect the temperature of the permanent magnet 41, or can be disposed at other component positions (such as the rotor coil) of the rotor assembly 41 for temperature detection. Those skilled in the art can choose according to requirements.

[0058] Based on the permanent magnet motor provided in the above embodiment, refer to Figure 3 , this application also provides a flowchart of the temperature signal transmission of the rotor assembly of the permanent magnet motor collected by the temperature sensor in real time.

[0059] Among them, the temperature signal collected by the temperature sensor 6 is transmitted to the slip ring rotor 72 via the signal connection line 8, then transmitted to the signal transmission line 9 by the slip ring stator 71 equipped with a brush, and finally transmitted to the motor controller or other data acquisition devices by the signal transmission line 9.

[0060] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A permanent magnet motor, characterized in that, Comprising: A stator assembly, a front end cover assembly, a rear end cover assembly, a rotor assembly, a rotating shaft, a temperature sensor, a brush, and a signal connection line; The rear end cover assembly and the front end cover assembly are respectively disposed at the rear end and the front end of the stator assembly; The rotor assembly is rotatably disposed within the stator assembly; The rotating shaft passes through the rotor assembly and projects from the rear end cover assembly and the front end cover assembly; The brush is disposed on the rear end cover assembly; The temperature sensor is disposed on the rotor assembly; The rotating shaft is provided with a connection line channel; One end of the signal connection line passes through the connection line channel and is connected to the temperature sensor, and the other end is connected to a signal transmission line through the brush.

2. The permanent magnet motor according to claim 1, wherein The connection line channel includes: a first sub-channel and a second sub-channel; The first sub-channel is axially opened along the rotating shaft; The second sub-channel is radially opened along the rotating shaft and communicates with the first sub-channel.

3. The permanent magnet motor according to claim 2, characterized in that A plurality of the second sub-channels are axially opened along the rotating shaft; There are a plurality of the temperature sensors; 4. The permanent magnet motor according to claim 2, wherein The first sub-channel is coaxial with the rotating shaft; 5. The permanent magnet motor according to claim 2, characterized in that The second sub-channel is disposed at a preset angle with respect to the first sub-channel; 6. The permanent magnet motor according to claim 1, characterized in that, The brush includes: a slip ring stator and a slip ring rotor disposed within the slip ring stator; 7. The permanent magnet motor according to claim 1, characterized in that, The rotor assembly includes: a permanent magnet; The temperature sensor is disposed on the permanent magnet.

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