阅读说明：本技术 永磁电机定转子温度和振动测量装置和永磁电机 (Permanent magnet motor stator and rotor temperature and vibration measuring device and permanent magnet motor ) 是由 尚海 江欣怡 张义 白明山 王卫 许乔 于 2019-11-11 设计创作，主要内容包括：本申请涉及一种永磁电机定转子温度和振动测量装置和永磁电机,测量装置包括：用于插入定子齿上预设的传感器孔的长条形的一体式传感器组；传感器孔位于电机定子轴向中心位置且位于定子齿中心线的径向方向；一体式传感器组包括依次排列的非接触式测温传感器、接触式测温传感器和振动传感器；非接触式测温传感器用于设置在传感器孔中靠近定子齿顶部的一端,以检测转子的温度；振动传感器用于设置在传感器孔中靠近定子轭的一端,以检测电机的振动；接触式测温传感器用于设置在非接触式测温传感器和振动传感器之间,以检测定子的温度。上述方案中,可以同时测量转子、定子的温度以及电机的振动情况,且上述装置结构简单、安装过程便捷,便于使用。(The application relates to a permanent-magnet machine stator and rotor temperature and vibration measuring device and permanent-magnet machine, measuring device includes: the integrated sensor group is used for being inserted into a sensor hole preset on the stator tooth; the sensor hole is positioned in the axial center of the motor stator and in the radial direction of the center line of the stator teeth; the integrated sensor group comprises a non-contact temperature measuring sensor, a contact temperature measuring sensor and a vibration sensor which are sequentially arranged; the non-contact temperature measuring sensor is arranged at one end of the sensor hole close to the top of the stator tooth to detect the temperature of the rotor; the vibration sensor is arranged at one end of the sensor hole close to the stator yoke so as to detect the vibration of the motor; the contact temperature sensor is arranged between the non-contact temperature sensor and the vibration sensor to detect the temperature of the stator. In the above scheme, the temperature of rotor, stator and the vibration condition of motor can be measured simultaneously, and above-mentioned device simple structure, installation are convenient, convenient to use.)

1. A permanent magnet motor stator and rotor temperature and vibration measuring device is characterized by comprising: the long-strip-shaped integrated sensor group is used for being inserted into a sensor hole preset on the stator tooth; the sensor hole is positioned in the axial center of the motor stator and in the radial direction of the center line of the stator teeth;

the integrated sensor group comprises a non-contact temperature measuring sensor, a contact temperature measuring sensor and a vibration sensor which are sequentially arranged;

the non-contact temperature measuring sensor is arranged at one end, close to the top of the stator teeth, in the sensor hole to detect the temperature of the rotor; the vibration sensor is arranged at one end of the sensor hole close to the stator yoke so as to detect the vibration of the motor; the contact temperature measuring sensor is arranged between the non-contact temperature measuring sensor and the vibration sensor in the sensor hole to detect the temperature of the stator.

2. The permanent magnet motor stator and rotor temperature and vibration measuring device according to claim 1, wherein the non-contact temperature measuring sensor is an infrared thermopile sensor, the contact temperature measuring sensor is a thermistor sensor, and the vibration sensor is an inductive vibration sensor.

3. The permanent magnet motor stator and rotor temperature and vibration measuring device according to claim 2, wherein each sensor in the sensor group is a Micro Electro Mechanical System (MEMS) packaged sensor, and the size of each sensor is 4mm in diameter and 3mm in height of a bottom circle.

4. The permanent magnet motor stator and rotor temperature and vibration measurement device of claim 3 further comprising aluminum tubes; the sensor group is arranged in the aluminum pipe, and the aluminum pipe is used for being inserted into the sensor hole.

5. The apparatus of claim 4, wherein the diameter of the sensor hole is 5mm, and the outer diameter of the aluminum tube is 4.5 mm.

6. The permanent magnet motor stator and rotor temperature and vibration measuring device of claim 4, wherein the aluminum tube is filled with epoxy glue for fixing the sensor set.

7. The permanent magnet motor stator and rotor temperature and vibration measuring device according to any one of claims 1-6, further comprising signal processing means; each sensor in the sensor group is connected to the signal processing device by adopting two outgoing lines; the signal processing device is used for amplifying, isolating and filtering signals acquired by the sensors, converting the processed analog signals into digital signals and transmitting the digital signals to the main controller.

8. The apparatus of claim 7, wherein all the leads of each sensor include a shielding layer.

9. The apparatus of claim 7, wherein the signal processing means comprises an amplifier, a single-chip microcomputer and a communication circuit.

10. A permanent magnet motor comprising a permanent magnet motor body with a sensor hole and a permanent magnet motor stator and rotor temperature and vibration measuring device according to any one of claims 1-9 disposed in the sensor hole; the sensor hole is located in the axial center of the motor stator and in the radial direction of the center line of the stator teeth.

Technical Field

The application relates to the technical field of permanent magnet motors, in particular to a permanent magnet motor stator and rotor temperature and vibration measuring device and a permanent magnet motor.

Background

At present, the permanent magnet motor gradually replaces the traditional asynchronous motor by the characteristics of high torque density, high efficiency, wide rotating speed range, high power factor, energy conservation and the like. However, compared with an asynchronous motor, due to the application of the rare earth permanent magnet, the eddy current in the rare earth permanent magnet and the iron core and harmonic waves caused by the influence of high-frequency carrier waves, tooth grooves and the like of the motor enable a motor rotor to generate large ferromagnetic loss, most of the loss is converted into heat to be dissipated, the temperature of a stator is overhigh due to the dissipated heat, and then a stator winding coil is possibly subjected to insulation damage or breakdown, and the coil is possibly short-circuited and ignited in severe cases. On the other hand, the motor may vibrate during rotation due to design and process problems in production, manufacturing, assembly and other links or uncertain factors occurring in long-term operation, and the vibration may also cause demagnetization or loss of magnetization of the permanent magnet, thereby possibly causing equipment failure. In summary, the accumulated high temperature and mechanical vibration may cause permanent unrecoverable demagnetization of the permanent magnet, which seriously affects the load carrying capability of the motor. Therefore, there is a very urgent need for the permanent magnet motor to measure the temperature of the stator and the rotor and the vibration of the stator in real time. The method has the advantages that the data of the temperature of the stator and the rotor of the permanent magnet motor and the vibration of the motor under different working conditions are determined, and not only can the long-term reliable work of maintenance equipment be realized, but also important basis can be provided for the optimization design of the motor.

Disclosure of Invention

The application provides a permanent magnet motor stator and rotor temperature and vibration measuring device and a permanent magnet motor to solve the problems of complex sensor mounting structure and inconvenient use existing in the measuring method of the stator and rotor temperature and vibration of the permanent magnet motor in the related technology.

The above object of the present application is achieved by the following technical solutions:

in a first aspect, an embodiment of the present application provides a permanent magnet motor stator and rotor temperature and vibration measurement apparatus, including: the long-strip-shaped integrated sensor group is used for being inserted into a sensor hole preset on the stator tooth; the sensor hole is positioned in the axial center of the motor stator and in the radial direction of the center line of the stator teeth;

the integrated sensor group comprises a non-contact temperature measuring sensor, a contact temperature measuring sensor and a vibration sensor which are sequentially arranged;

the non-contact temperature measuring sensor is arranged at one end, close to the top of the stator teeth, in the sensor hole to detect the temperature of the rotor; the vibration sensor is arranged at one end of the sensor hole close to the stator yoke so as to detect the vibration of the motor; the contact temperature measuring sensor is arranged between the non-contact temperature measuring sensor and the vibration sensor in the sensor hole to detect the temperature of the stator.

Optionally, the non-contact temperature measuring sensor is an infrared thermopile sensor, the contact temperature measuring sensor is a thermistor sensor, and the vibration sensor is an inductive vibration sensor.

Optionally, each sensor in the sensor group is a mems encapsulated sensor, and the size is 4mm in diameter and 3mm in height of the bottom circle.

Optionally, the permanent magnet motor stator and rotor temperature and vibration measuring device further comprises an aluminum pipe; the sensor group is arranged in the aluminum pipe, and the aluminum pipe is used for being inserted into the sensor hole.

Optionally, the diameter of the sensor hole is 5mm, and the outer diameter of the aluminum tube is 4.5 mm.

Optionally, epoxy glue is filled in the aluminum pipe and used for fixing the sensor group.

Optionally, the device for measuring the temperature and the vibration of the stator and the rotor of the permanent magnet motor further comprises a signal processing device; each sensor in the sensor group is connected to the signal processing device by adopting two outgoing lines; the signal processing device is used for amplifying, isolating and filtering signals acquired by the sensors, converting the processed analog signals into digital signals and transmitting the digital signals to the main controller.

Optionally, all the lead-out wires of each sensor further include a shielding layer.

Optionally, the signal processing device includes an amplifier, a single chip, and a communication circuit.

In a second aspect, an embodiment of the present application further provides a permanent magnet motor, including a permanent magnet motor body with a sensor hole, and any one of the above permanent magnet motor stator and rotor temperature and vibration measuring devices disposed in the sensor hole; the sensor hole is located in the axial center of the motor stator and in the radial direction of the center line of the stator teeth.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the technical scheme provided by the embodiment of the application, three traditional discrete measuring sensors are combined, and the integrated sensor group is arranged in the stator teeth, so that the temperatures of the rotor and the stator and the vibration condition of the motor can be measured simultaneously, and the motor can be monitored effectively in real time for a long time; in addition, the sensor group is simple in structure, convenient and fast in installation process and convenient for users to use, and key operation information of the motor can be collected on the basis, so that data support is provided for design, installation and use of the motor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural diagram of a device for measuring temperature and vibration of a stator and a rotor of a permanent magnet motor according to an embodiment of the present disclosure;

fig. 2 is a schematic radial cross-sectional view of a permanent magnet motor including a permanent magnet motor stator and rotor temperature and vibration measurement device according to an embodiment of the present application;

fig. 3 is an axial cross-sectional schematic view of a permanent magnet motor including a permanent magnet motor stator and rotor temperature and vibration measurement device according to an embodiment of the present application;

FIG. 4 is a partially enlarged schematic view of FIG. 3 (b);

fig. 5 is a schematic structural diagram of a signal processing apparatus according to an embodiment of the present disclosure;

reference numerals: 1-a sensor group; 11-a non-contact temperature measuring sensor; 12-a contact temperature sensor; 13-a vibration sensor; 2-a stator; 21-stator teeth; 22-stator yoke; 3-a rotor; 4-an aluminum tube; 5-signal processing means.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

Before describing the technical solution of the present application in detail, a method for measuring the temperature and vibration of a stator and a rotor of a permanent magnet motor in the prior art and problems of the method are described first.

At present, the mainstream stator temperature measurement mode is to embed a thermal resistance temperature sensor in the motor production process, specifically, in the stator winding process, and two signal lines of the sensor are merged into a plug along with a motor encoder line group and then are connected to a motor driver. The structure has complex wiring and long wiring, and the long-distance lead of the thermal resistance sensor causes the resistance value to deviate, so that the temperature of the stator coil cannot be accurately obtained.

And mainstream motor manufacturers especially relate to the way that permanent magnet motor rotor temperature measurement in the prior art to electric main shaft, energy-saving motor etc. all is indirect measurement basically, specifically: a hole is formed in the center of the shaft, and after the motor runs for a period of time, the thermal resistance temperature sensor or the infrared temperature sensor is inserted into the shaft hole to indirectly measure the temperature of the rotor. The mode can not accurately test the heating condition of the motor and the actual temperature of the permanent magnet in the running process, can not monitor the temperature data in real time so as to carry out corresponding measures, and is only the factory test of a motor manufacturer on the motor. If the rotor needs to be directly measured in temperature, a thermal resistor, a thermocouple or a fiber bragg grating is usually adopted, temperature measuring probes need to be arranged on the surface of the rotor during actual temperature measurement, signal wires are respectively led out from each probe and led out through the center of a shaft, and the mode is complex in installation, high in operation difficulty and capable of increasing the operation failure rate of equipment.

The most widely used instrument for measuring vibration in the manufacturing and testing links of the motor is a motor vibration tester. The motor vibration tester is an indispensable detection device for motor manufacturers. When the motor vibration tester detects, the motor is placed on the test bench, the motor is fixed by the clamp, a plurality of test sensor probes of the vibration tester are adhered to a motor shell by glue, and when a rotor rotates, the vibration condition of the motor is tested. However, the vibration tester can only detect when the motor leaves the factory, and cannot effectively monitor the motor for a long time after the motor is installed in the equipment. For a motor matched with equipment, a user often needs to be equipped with a vibration detection device to jointly use the vibration detection device and a controller to perform algorithm configuration, and corresponding speed reduction, sudden stop or power-off protection is performed when the motor vibrates abnormally. In the face of the user's demand, the vibration tester cannot meet the application demand.

The following embodiments of the present application first solve the above-identified problems of complicated installation of the sensor structure and inconvenience in real-time data monitoring processing and control for a long time.