A method and device for detecting deformation of a high-speed motor rotor based on thin-film materials

Abstract

The present invention proposes a high-speed motor rotor deformation detection method and device based on thin film materials, aiming to solve the current problem of being unable to detect the deformation of the high-speed motor rotor in real time during operation. The present invention uses a new sensor based on molybdenum disulfide flexible material. The sensor not only has the advantages of strong flexibility and thin thickness, but also has a good piezoelectric effect. That is, when the sensor produces tensile deformation, its own resistance will increase. When used in series with a copper-manganese alloy resistor to form a voltage divider circuit, its output voltage will increase; in addition, the sensor is also sensitive to light intensity, that is, the stronger the light, the greater the output voltage. Based on this sensor, the present invention proposes a light source closed-loop control system, through which the strain of the motor rotor can be better detected.

Description

Technical Field

[0001] The present invention belongs to the field of motor manufacturing, and in particular relates to a high-speed motor rotor deformation detection method and device based on thin film materials. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy based on the law of electromagnetic induction. With the continuous development of industrial technology, the types of motors are becoming increasingly diverse. There are many ways to classify motors. Based on their structure and operating principle, motors can be divided into three types: DC motors, asynchronous motors, and synchronous motors. Synchronous motors can be further divided into permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors.

[0003] A permanent magnet synchronous motor (PMSM) is an electric motor that converts electrical energy into mechanical energy through the interaction between the constant magnetic field generated by permanent magnets and the rotating electromagnetic field generated by stator coils. It offers advantages such as high efficiency, high power density, and high-precision control, and is widely used in electric vehicles, wind power generation, industrial robots, and other fields. A PMSM primarily consists of a rotor, stator, and end caps. The rotor primarily includes permanent magnets, a rotor core, a rotating shaft, and bearings. Depending on the position of the permanent magnets within the rotor core, it can be divided into surface-mount PMSMs and interior-mount PMSMs. However, as the requirements for high-speed rotor operation increase, stress and deformation in the PMSM rotor have become a significant factor affecting its performance and lifespan. During high-speed operation, centrifugal and inertial forces cause stress and deformation in the PMSM rotor, leading to changes in its magnetic properties and, consequently, affecting the motor's output performance and stability. To prevent and minimize damage to the motor caused by rotor stress and deformation, real-time rotor stress and deformation monitoring is necessary. However, the current technical means for detecting motor rotor deformation are very limited. Since the rotor is constantly rotating at high speed and the closed and highly corrosive environment inside the motor makes it extremely difficult for ordinary sensors to detect motor rotor stress and deformation. Summary of the Invention

[0004] In response to the above problems, the present invention proposes a high-speed motor rotor deformation detection method and device based on thin film materials, aiming to solve the current problem of being unable to detect the deformation of the high-speed motor rotor in real time during operation. The present invention uses a new sensor based on molybdenum disulfide flexible material. The sensor not only has the advantages of strong flexibility and thin thickness, but also has a good piezoelectric effect. That is, when the sensor produces tensile deformation, its own resistance will increase, and when used in series with a copper-manganese alloy resistor to form a voltage divider circuit, its output voltage will increase; in addition, the sensor is also sensitive to light intensity, that is, the stronger the light, the greater the output voltage. Based on this sensor, the present invention proposes a light source closed-loop control system, through which the strain of the motor rotor can be better detected.

[0005] The present invention discloses a high-speed motor rotor deformation detection method and device based on thin film materials, comprising:

[0006] When the molybdenum disulfide deformation sensor is deformed, its own resistance will change. When used in series with the copper-manganese alloy resistor, a voltage divider circuit is formed. When the molybdenum disulfide deformation sensor is stretched, its own resistance will increase, and its output voltage will also increase.

[0007] Copper-manganese alloy resistor, a metal sheet with a constant resistance value that does not change with changes in deformation;

[0008] The slip ring is glued to the motor rotor and supplies power to the molybdenum disulfide deformation sensor to prevent the wires from getting tangled during the rotation of the motor rotor;

[0009] The induction coil receives the voltage signal output by the molybdenum disulfide deformation sensor and generates a magnetic field;

[0010] The switch type Hall element outputs a high level when the magnetic field strength reaches the set value, otherwise it outputs a low level, and works with the induction coil to detect the magnetic field signal of the induction coil;

[0011] The light source is adjusted through the control system to ensure that the molybdenum disulfide deformation sensor can always output a stable voltage signal;

[0012] Step 1: Create a table of the deformation-duty cycle correspondence of the MoS2 deformation sensor through experiments:

[0013] The molybdenum disulfide deformation sensor is placed on a tensile instrument, and the molybdenum disulfide deformation sensor is connected to the light source closed-loop control system proposed in the present invention for testing. The molybdenum disulfide deformation sensor is stretched to cause the molybdenum disulfide deformation sensor to produce tensile deformation. When the deformation variable generated by the molybdenum disulfide deformation sensor is x1, after calculation by the light source closed-loop control system, a duty cycle P1 will be output by the PWM wave serial port of the single-chip microcomputer; continue to use the tensile instrument to apply force to the molybdenum disulfide so that its deformation variable becomes x2, at which time the PWM wave serial port of the single-chip microcomputer will output a duty cycle P2; perform the test n times in sequence to obtain a deformation variable-duty cycle correspondence table of the deformation variable of the molybdenum disulfide deformation sensor and the duty cycle of the PWM wave, convert the data in the table into digital quantities through an A / D converter to obtain Table 1, and store Table 1 in the single-chip microcomputer;

[0014] Table 1

[0015] Deformation Duty cycle <![CDATA[X dig1 ]]> <![CDATA[P dig1 ]]> <![CDATA[X dig2 ]]> <![CDATA[P dig2 ]]> <![CDATA[X dig3 ]]> <![CDATA[P dig3 ]]> <![CDATA[X dig4 ]]> <![CDATA[P dig4 ]]> ... ... <![CDATA[X dign ]]> <![CDATA[P dign ]]>

[0016] Step 2: Connect the equipment and the closed-loop control system of the light source starts working:

[0017] Connect the positive and negative poles of the external power supply to the positive pole of the outer ring a power supply and the negative pole of the outer ring b power supply on the outer ring of the slip ring. Connect the positive pole of the inner ring power supply on the inner ring of the slip ring to the copper-manganese alloy resistor wire. Connect the copper-manganese alloy resistor to the induction coil wire. Connect the induction coil to the molybdenum disulfide deformation sensor wire. Connect the molybdenum disulfide deformation sensor to the negative pole of the inner ring power supply on the inner ring of the slip ring. Connect the light source to the signal receiver and glue them to the motor housing.

[0018] After the motor starts running, when the motor speed is slow, the deformation of the motor rotor is small, and the voltage signal generated by the molybdenum disulfide deformation sensor due to the deformation of the motor rotor is weak. At this time, a light source is introduced as a signal strength compensation, so that the molybdenum disulfide deformation sensor always outputs a steady-state voltage signal K under the combined action of the light source and the motor rotor deformation. This voltage signal is amplified by the operational amplifier and then converted into a digital value K by the A / D converter in the single-chip microcomputer. dig After that, it is used as feedback signal and system setting value AD ref After the PI operation, a duty cycle P is output through the PWM wave serial port of the microcontroller. sdig , through the duty cycle P of this PWM wave sdig To adjust the brightness of the light source; if the motor rotor speed is low, the voltage signal value generated by the molybdenum disulfide deformation sensor due to the motor rotor deformation is much smaller than the steady-state voltage signal K. At this time, the system will use a larger duty cycle P after adjustment. sdig To increase the intensity of the light source, the voltage signal output by the molybdenum disulfide sensor reaches K; if the motor rotor speed is fast, the voltage generated by the molybdenum disulfide deformation sensor due to the motor rotor deformation becomes larger but is still smaller than the steady-state voltage signal K. At this time, the system will use a smaller duty cycle P after adjustment. sdig To reduce the intensity of the light source;

[0019] Step 3: Check the table to determine the deformation of the motor rotor:

[0020] When the motor is working, the duty cycle P output by the MCU PWM wave serial port is detected and recorded in real time. sdig When the deformation of the motor rotor is required, the duty cycle P sdig Search the data in the shape variable-duty cycle table stored in the MCU flash workspace. If P sdig =P dign , indicating that the deformation of the motor rotor is X dign , the actual deformation variable Xn is obtained through the A / D converter;

[0021] The beneficial effects of the present invention are:

[0022] 1. The detection device and method of the present invention can detect the deformation of the permanent magnet synchronous motor rotor in real time when the motor is running at high speed, and can prevent the motor from being damaged by excessive deformation of the rotor.

[0023] 2. The duty cycle-deformation tabulation method proposed in the present invention converts the deformation of the motor rotor into the change of the duty cycle of the voltage signal, which can intuitively reflect the deformation of the motor rotor.

[0024] 3. The molybdenum disulfide flexible material sensor used in the present invention has many advantages such as thin thickness, strong flexibility, and good piezoelectric effect. It can detect the deformation of the motor rotor in real time without destroying the mechanical properties of the motor rotor.

[0025] 4. This invention proposes a closed-loop control system algorithm for light sources, using the voltage signal output by the molybdenum disulfide material as feedback. By determining the duty cycle of the voltage PWM wave, the intensity of the light source is adjusted, achieving a stable dynamic balance.

[0026] For ease of explanation, the present invention is described in detail with reference to the following specific embodiments and accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a diagram showing the internal structure of the motor according to the present invention;

[0029] Figure 3 This is a schematic diagram of the positions of the motor rotor and the detection device according to the present invention;

[0030] Figure 4 This is a structural diagram of the slip ring of the present invention;

[0031] Figure 5 Structural diagram of the signal receiver of the present invention;

[0032] Figure 6 This is a schematic diagram of the connection between the sensor and the resistor according to the present invention;

[0033] Figure 7 This is a diagram of the closed-loop control system for the light source of the present invention;

[0034] Figure 8 This is a trend diagram of the corresponding relationship between the deformation amount and the duty cycle of the present invention;

[0035] In the figure, 1. screw; 2. bearing a; 3. motor end cover; 4. motor rotor; 5. induction coil; 6. copper-manganese alloy resistor; 7. molybdenum disulfide deformation sensor; 8. slip ring; 9. motor housing; 10. bearing b; 7-1. wire; 8-1. slip ring outer ring a; 8-2. slip ring outer ring b; 8-3. slip ring inner ring; 8-4. connecting steel column; 8-5. positive power supply of outer ring a; 8-6. negative power supply of outer ring b; 8-7. positive power supply of inner ring; 8-8. negative power supply of inner ring; 9-1. signal receiver; 9-2. connecting wire; 9-3. light source; 9-1-1. switch-type Hall element; 9-1-2. single-chip microcomputer; DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] The specific embodiments / examples described herein are specific embodiments of the present invention and are used to illustrate the concept of the present invention. They are illustrative and exemplary and should not be construed as limiting the embodiments of the present invention or the scope of the present invention. In addition to the examples described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the disclosure of the specification. These technical solutions, including any obvious replacements and modifications of the embodiments described herein, are all within the scope of protection of the present invention.

[0038] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0039] As shown in Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8 As shown, the specific embodiment of the present invention adopts the following technical solutions:

[0040] The invention relates to a method and device for detecting deformation of a high-speed motor rotor based on thin film materials, and a device for detecting deformation of a high-speed motor rotor based on thin film materials, comprising a screw (1), a bearing a (2), a motor end cover (3), a motor rotor (4), an induction coil (5), a copper-manganese alloy resistor (6), a molybdenum disulfide deformation sensor (7), a slip ring (8), a motor housing (9), a bearing b (10); a conductor (7-1); a slip ring outer ring a (8-1), a slip ring outer ring b (8-2), a slip ring inner ring (8-3), a connecting steel column (8-4), a positive power supply electrode of the outer ring a (8-5), The outer ring b power supply negative electrode (8-6), the inner ring power supply positive electrode (8-7), the inner ring power supply negative electrode (8-8); a signal receiver (9-1), a connecting wire (9-2), a light source (9-3), a switch type Hall element (9-1-1), and a single chip computer (9-1-2); the specific connection method is that the molybdenum disulfide deformation sensor (7) and the copper-manganese alloy resistor (6) are both glued to the motor rotor (4), the copper-manganese alloy resistor (6) is connected to the inner ring power supply positive electrode (8-7) on the inner ring (8-3) through a wire (7-1), and then connected to the induction coil (5) through a wire (7-1), and the induction The response coil (5) is connected to the molybdenum disulfide deformation sensor (7) through a wire (7-1), and the molybdenum disulfide deformation sensor (7) is further connected to the inner ring power negative electrode (8-8) on the inner ring of the slip ring (8-3) through a wire (7-1), forming a closed loop; the slip ring inner ring (8-3) is glued to the motor rotor (4), and the slip ring outer ring a (8-1) and the slip ring outer ring b (8-2) are connected together through a connecting steel column (8-4) to form a slip ring outer ring, and are clearance-matched with the slip ring inner ring (8-3); the signal receiver (9-1) and the light source (9-3) are connected through a connecting wire (9-2 ) are connected, wherein the switch type Hall element (9-1-1) and the single chip microcomputer (9-1-2) are both soldered to the signal receiver (9-1), the installation position of the signal receiver (9-1) is located directly above the induction coil (5) and glued to the opening on the motor housing (9), the light source (9-3) is located directly above the molybdenum disulfide deformation sensor (7) and glued to the opening on the motor housing (9); the motor end cover (3) and the motor housing (9) are connected together by screws (1); the bearing a (2) is cooperatively connected to the motor end cover (3), and the bearing b (10) is connected to the motor housing (9);

[0041] The positive pole of the external power supply and the negative pole of the external power supply are connected to the positive pole (8-5) of the power supply of the outer ring a and the negative pole (8-6) of the power supply of the outer ring b respectively, and the direct current is introduced into the inner ring (8-3) of the slip ring through the contact and cooperation between the conductive groove on the outer ring of the slip ring and the conductive ring on the inner ring (8-3) of the slip ring to provide direct current power to the system; when the system starts working, the detection coil (5) will receive the changing voltage signal and generate a changing radial magnetic field, and the switch type Hall element (9-1-1) matched with the detection coil (5) will detect the changing magnetic field signal;

[0042] A high-speed motor rotor deformation detection method and device based on thin film materials, which is applied to the field of high-speed motor rotor deformation detection:

[0043] A method and device for detecting deformation of a high-speed motor rotor based on thin film materials. The specific implementation process of the method is as follows:

[0044] Step 1: Create a table of the deformation-duty cycle correspondence of the MoS2 deformation sensor through experiments:

[0045] The molybdenum disulfide deformation sensor is placed on a tensile tester, and the molybdenum disulfide deformation sensor is connected to the light source closed-loop control system proposed in the present invention for testing. The molybdenum disulfide deformation sensor is stretched to cause the molybdenum disulfide deformation sensor to produce tensile deformation. When the deformation variable generated by the molybdenum disulfide deformation sensor is x1, after calculation by the light source closed-loop control system, a duty cycle P1 will be output by the PWM serial port of the single-chip microcomputer; continue to use the tensile tester to apply force to the molybdenum disulfide so that its deformation variable becomes x2, at which time the PWM serial port of the single-chip microcomputer will output a duty cycle P2; perform the test n times in sequence to obtain a deformation variable-duty cycle correspondence table of the deformation variable of the molybdenum disulfide deformation sensor and the duty cycle of the PWM wave, convert the data in the table into digital quantities through an A / D converter to obtain Table 1, and store Table 1 in the single-chip microcomputer;

[0046] Table 1

[0047] Deformation Duty cycle <![CDATA[X dig1 ]]> <![CDATA[P dig1 <!-- 4 -->]]> <![CDATA[X dig2 ]]> <![CDATA[P dig2 ]]> <![CDATA[X dig3 ]]> <![CDATA[P dig3 ]]> <![CDATA[X dig4 ]]> <![CDATA[P dig4 ]]> ... ... <![CDATA[X dign ]]> <![CDATA[P dign ]]>

[0048] Step 2: Connect the equipment and the closed-loop control system of the light source starts working:

[0049] Connect the positive and negative poles of the external power supply to the positive pole of the outer ring a power supply and the negative pole of the outer ring b power supply on the outer ring of the slip ring. Connect the positive pole of the inner ring power supply on the inner ring of the slip ring to the copper-manganese alloy resistor wire. Connect the copper-manganese alloy resistor to the induction coil wire. Connect the induction coil to the molybdenum disulfide deformation sensor wire. Connect the molybdenum disulfide deformation sensor to the negative pole of the inner ring power supply on the inner ring of the slip ring. Connect the light source to the signal receiver and glue them to the motor housing.

[0050] After the motor starts running, when the motor speed is slow, the deformation of the motor rotor is small, and the voltage signal generated by the molybdenum disulfide deformation sensor due to the deformation of the motor rotor is weak. At this time, a light source is introduced as a signal strength compensation, so that the molybdenum disulfide deformation sensor always outputs a steady-state voltage signal K under the combined action of the light source and the motor rotor deformation. This voltage signal is amplified by the operational amplifier and then converted into a digital value K by the A / D converter in the single-chip microcomputer. dig After that, it is used as feedback signal and system setting value AD ref After the PI operation, a duty cycle P is output through the PWM wave serial port of the microcontroller. sdig , through the duty cycle P of this PWM wave sdig To adjust the brightness of the light source; if the motor rotor speed is low, the voltage signal value generated by the molybdenum disulfide deformation sensor due to the motor rotor deformation is much smaller than the steady-state voltage signal K. At this time, the system will use a larger duty cycle P after adjustment. sdig To increase the intensity of the light source, the voltage signal output by the MoS2 deformation sensor reaches K. If the motor rotor speed is fast, the voltage generated by the MoS2 deformation sensor due to the motor rotor deformation becomes larger but is still smaller than the steady-state voltage signal K. At this time, the system will use a smaller duty cycle P after adjustment. sdig To reduce the intensity of the light source;

[0051] Step 3: Check the table to determine the deformation of the motor rotor:

[0052] When the motor is working, the duty cycle P output by the MCU PWM wave serial port is detected and recorded in real time. sdig When the deformation of the motor rotor is required, the duty cycle P sdig Search the data in the shape variable-duty cycle table stored in the MCU flash workspace. If P sdig =P dign , indicating that the deformation of the motor rotor is X dign , the actual deformation variable Xn is obtained through the A / D converter.

[0053] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-speed motor rotor deformation detection device based on thin film materials, characterized by: The invention comprises a screw (1), a bearing a (2), a motor end cover (3), a motor rotor (4), an induction coil (5), a copper-manganese alloy resistor (6), a molybdenum disulfide deformation sensor (7), a slip ring (8), a motor housing (9), a bearing b (10); a wire (7-1); a slip ring outer ring a (8-1), a slip ring outer ring b (8-2), a slip ring inner ring (8-3), a connecting steel column (8-4), a positive power supply electrode of the outer ring a (8-5), a negative power supply electrode of the outer ring b (8-6), a positive power supply electrode of the inner ring (8-7), and a negative power supply electrode of the inner ring (8-8); a signal The invention relates to a motor drive system comprising a signal receiver (9-1), a connecting wire (9-2), a light source (9-3), a switch type Hall element (9-1-1), and a single chip microcomputer (9-1-2); the specific connection method is as follows: the molybdenum disulfide deformation sensor (7) and the copper-manganese alloy resistor (6) are both glued to the motor rotor (4); the copper-manganese alloy resistor (6) is connected to the inner ring power positive electrode (8-7) on the inner ring of the current collector (8-3) through a wire (7-1), and then connected to the induction coil (5) through a wire (7-1); the induction coil (5) and the molybdenum disulfide deformation sensor (7) are connected through a wire (7-1). -1), the molybdenum disulfide deformation sensor (7) is connected to the inner ring power supply negative electrode (8-8) on the inner ring of the collector ring (8-3) through a wire (7-1) to form a closed loop; the inner ring of the collector ring (8-3) is glued to the motor rotor (4), the outer ring of the collector ring a (8-1) and the outer ring of the collector ring b (8-2) are connected together through a connecting steel column (8-4) to form the outer ring of the collector ring, and are clearance-matched with the inner ring of the collector ring (8-3); the signal receiver (9-1) and the light source (9-3) are connected through a connecting wire (9-2), wherein the switch type Hall element The component (9-1-1) and the single chip microcomputer (9-1-2) are both soldered to the signal receiver (9-1). The installation position of the signal receiver (9-1) is located directly above the induction coil (5) and is glued to the opening on the motor housing (9). The light source (9-3) is located directly above the molybdenum disulfide deformation sensor (7) and is glued to the opening on the motor housing (9). The motor end cover (3) and the motor housing (9) are connected together by screws (1). The bearing a (2) is connected to the motor end cover (3) in a cooperative manner, and the bearing b (10) is connected to the motor housing (9). The positive pole of the external power supply and the negative pole of the external power supply are connected to the positive pole (8-5) of the power supply of the outer ring a and the negative pole (8-6) of the power supply of the outer ring b respectively. Through the contact and cooperation between the conductive groove on the outer ring of the slip ring and the conductive ring on the inner ring (8-3) of the slip ring, direct current is introduced into the inner ring (8-3) of the slip ring to provide direct current power to the system. When the system starts working, the induction coil (5) will receive the changing voltage signal and generate a changing radial magnetic field, and the switch type Hall element (9-1-1) matched with the induction coil (5) will detect the changing magnetic field signal.

2. A high-speed motor rotor deformation detection method based on thin film materials, characterized by: The specific implementation process of the method is: Step 1: Create a table of the deformation-duty cycle correspondence of the MoS2 deformation sensor through experiments: The molybdenum disulfide deformation sensor is placed on the tensile instrument, and the molybdenum disulfide deformation sensor is connected to the light source closed-loop control system for testing. The molybdenum disulfide deformation sensor is stretched to cause the molybdenum disulfide deformation sensor to produce tensile deformation. When the deformation variable generated by the molybdenum disulfide deformation sensor is x1, after calculation by the light source closed-loop control system, a duty cycle P1 is output by the PWM serial port of the single-chip microcomputer. The tensile instrument is continued to apply force to the molybdenum disulfide deformation sensor to change its deformation variable to x2. At this time, the PWM serial port of the single-chip microcomputer will output a duty cycle P2. The steps are carried out n times in sequence to obtain a deformation variable-duty cycle correspondence table of the deformation variable of the molybdenum disulfide deformation sensor and the duty cycle of the PWM wave. The data in the table is converted into digital quantities through an A / D converter to obtain a table, and the table is stored in the single-chip microcomputer. Step 2: Connect the equipment and the closed-loop control system of the light source starts working: Connect the positive and negative poles of the external power supply to the positive pole of the outer ring a power supply and the negative pole of the outer ring b power supply on the outer ring of the slip ring. Connect the positive pole of the inner ring power supply on the inner ring of the slip ring to the copper-manganese alloy resistor wire. Connect the copper-manganese alloy resistor to the induction coil wire. Connect the induction coil to the molybdenum disulfide deformation sensor wire. Connect the molybdenum disulfide deformation sensor to the negative pole of the inner ring power supply on the inner ring of the slip ring. Connect the light source to the signal receiver and glue them to the motor housing. After the motor starts running, when the motor speed is slow, the deformation of the motor rotor is small, and the voltage signal generated by the molybdenum disulfide deformation sensor due to the deformation of the motor rotor is weak. At this time, a light source is introduced as a signal strength compensation, so that the molybdenum disulfide deformation sensor always outputs a steady-state voltage signal K under the combined action of the light source and the motor rotor deformation. This voltage signal is amplified by the operational amplifier and then converted into a digital value K by the A / D converter in the single-chip microcomputer. dig After that, it is used as feedback signal and system setting value AD ref After the PI operation, a duty cycle P is output through the PWM wave serial port of the microcontroller. sdig , through the duty cycle P of this PWM wave sdig To adjust the brightness of the light source; if the motor rotor speed is low, the voltage signal value generated by the molybdenum disulfide deformation sensor due to the motor rotor deformation is much smaller than the steady-state voltage signal K. At this time, the system will use a larger duty cycle P after adjustment. sdig To increase the intensity of the light source, the voltage signal output by the MoS2 deformation sensor reaches K. If the motor rotor speed is fast, the voltage generated by the MoS2 deformation sensor due to the motor rotor deformation becomes larger but is still smaller than the steady-state voltage signal K. At this time, the system will use a smaller duty cycle P after adjustment. sdig To reduce the intensity of the light source; Step 3: Check the table to determine the deformation of the motor rotor: When the motor is working, the duty cycle P output by the MCU PWM wave serial port is detected and recorded in real time. sdig When the deformation of the motor rotor is required, the duty cycle P sdig Search the data in the shape variable-duty cycle table stored in the MCU flash workspace. If P sdig =P dign , indicating that the deformation of the motor rotor is X dign , the actual deformation variable Xn is obtained through the A / D converter.

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