An elevator motor voltage detection circuit

Abstract

The utility model relates to an elevator motor voltage detection circuit, include: U-V proportional operation circuit, its signal sampling port is connected with motor's U phase and V phase port and exports a first analog voltage signal, U-V AD conversion circuit, its input end is connected with U-V proportional operation circuit's output, U-W proportional operation circuit, its signal sampling port is connected with motor's U phase and W phase port and exports a second analog voltage signal, U-W AD conversion circuit, its input end is connected with U-W proportional operation circuit's output, MCU master control unit, its input end is connected with U-V AD conversion circuit and U-W AD conversion circuit's output respectively. The utility model can detect the voltage remaining on motor terminal after the power off of motor, to judge the current running direction and frequency of motor, complete speed tracking function, when motor starts again, can accelerate start on the basis of original speed.

Description

Technical Field

[0001] This utility model relates to the field of elevator control technology, and in particular to an elevator motor voltage detection circuit. Background Technology

[0002] Modern office building elevators are required to have a rapid start-up response to ensure that passengers do not wait too long in high-rise buildings. This rapid start-up response can improve the user experience and reduce unnecessary waiting.

[0003] However, rapid start-up response in elevator motor control systems faces numerous challenges. When the motor is de-energized, a certain voltage remains on the motor terminals due to winding inductance, parasitic capacitance, or mechanical inertia (such as regenerative braking). This residual voltage can cause several problems: on the one hand, it may lead to safety hazards, such as the risk of electric shock, threatening the safety of passengers and maintenance personnel; on the other hand, residual voltage may affect the rapid restart of the motor, or even interfere with the system's diagnostic functions, causing the elevator to malfunction, further prolonging passenger waiting time, and reducing the overall performance of the elevator system.

[0004] Therefore, developing a circuit that can effectively detect the voltage at the motor terminals is crucial for ensuring the safe operation and rapid response capability of elevator systems. Summary of the Invention

[0005] This invention aims to address the shortcomings of existing technologies by providing an elevator motor voltage detection circuit.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an elevator motor voltage detection circuit, comprising:

[0007] The UV proportional operation circuit has its signal sampling port connected to the U-phase and V-phase ports of the motor. It is used to perform proportional operation on the voltage between the U-phase and V-phase and output a first analog voltage signal.

[0008] The UV analog-to-digital converter circuit has its input terminal connected to the output terminal of the UV proportional operation circuit, and is used to convert the first analog voltage signal into a first digital signal.

[0009] The UW proportional operation circuit has its signal sampling port connected to the U-phase and W-phase ports of the motor. It is used to perform proportional operation on the voltage between the U-phase and W-phase and output a second analog voltage signal.

[0010] The UW analog-to-digital converter circuit has its input terminal connected to the output terminal of the UW proportional operation circuit, and is used to convert the second analog voltage signal into a second digital signal.

[0011] The MCU main control unit has its input terminals connected to the output terminals of the UV analog-to-digital converter circuit and the UW analog-to-digital converter circuit, respectively. It is used to receive the first digital signal and the second digital signal, and calculate the current running direction and frequency of the motor based on the first digital signal and the second digital signal to complete the speed tracking function. When the motor is restarted, it controls the motor to accelerate from the original speed.

[0012] Specifically, the UV proportional operation circuit includes proportional resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, feedback resistor R11, operational amplifier chip U1A, filter capacitor C1, filter capacitor C2, first voltage source, second voltage source, third voltage source, and fourth voltage source. The U-phase port of the motor is connected to the non-inverting input terminal of the operational amplifier chip U1A after connecting proportional resistors R1, R2, R3, and R4 in series. The V-phase port of the motor is connected to the inverting input terminal of the operational amplifier chip U1A after connecting proportional resistors R5, R6, R7, and R8 in series. One end of the proportional resistor R9 is connected to the node between the proportional resistor R4 and the non-inverting input terminal of the operational amplifier chip U1A, and the other end is connected to the first voltage source. One end of the proportional resistor R10 is connected to the node between the proportional resistor R8 and the inverting input terminal of the operational amplifier chip U1A, and the other end is connected to the second voltage source. One end of the feedback resistor R11 is connected to the output terminal of the operational amplifier chip U1A, and the other end is connected to the node between the proportional resistor R10 and the inverting input terminal of the operational amplifier chip U1A. The output terminal of the operational amplifier chip U1A outputs a U(uv) signal, which is the first analog voltage signal. The third voltage source is connected to the positive power supply terminal of the operational amplifier chip U1A and grounded through the filter capacitor C2. The fourth voltage source is connected to the negative power supply terminal of the operational amplifier chip U1A and grounded through the filter capacitor C1.

[0013] Specifically, the first and second voltage sources are both VCC2V5, the third voltage source is VCC+15V, and the fourth voltage source is VCC-15V.

[0014] Specifically, the UV analog-to-digital converter circuit includes resistors R12, R13, R14, and R15, comparator chip U2A, filter capacitor C3, a fifth voltage source, a sixth voltage source, and a seventh voltage source. One end of resistor R12 is connected to the U(uv) signal, and the other end is connected to the non-inverting input of comparator chip U2A. One end of resistor R13 is connected to the fifth voltage source, and the other end is connected to the inverting input of comparator chip U2A. The output of comparator chip U2A outputs the AD(uv) signal, which is the first digital signal and is connected to the MCU main control unit. One end of resistor R14 is connected to the node between resistor R12 and the non-inverting input of comparator chip U2A, and the other end is connected to the output of comparator chip U2A. One end of resistor R15 is connected to the sixth voltage source, and the other end is connected to the output of comparator chip U2A. The seventh voltage source is connected to the positive power supply of comparator chip U2A and grounded through filter capacitor C3. The negative power supply of comparator chip U2A is grounded.

[0015] Specifically, the fifth voltage source is VCC2V5, the sixth voltage source is VCC5V, and the seventh voltage source is VCC5V.

[0016] Specifically, the UW proportional operation circuit includes proportional resistors R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, feedback resistor R26, operational amplifier chip U1B, eighth voltage source, and ninth voltage source. The U-phase port of the motor is connected in series with proportional resistors R16, R17, R18, and R19, and then connected to the non-inverting input of operational amplifier chip U1B. The W-phase port of the motor is connected in series with proportional resistors R20, R21, and R22, and then with the feedback resistor R26. For example, resistor R23 is connected to the inverting input of operational amplifier chip U1B. One end of proportional resistor R24 ​​is connected to the eighth voltage source, and the other end is connected to the node between proportional resistor R19 and the non-inverting input of operational amplifier chip U1B. One end of proportional resistor R25 is connected to the ninth voltage source, and the other end is connected to the node between proportional resistor R23 and the inverting input of operational amplifier chip U1B. One end of feedback resistor R26 is connected to the output of operational amplifier chip U1B, and the other end is connected to the node between proportional resistor R25 and the inverting input of operational amplifier chip U1B. The output of operational amplifier chip U1B outputs the U(uw) signal, which is the second analog voltage signal.

[0017] Specifically, the eighth voltage source is VCC2V5, and the ninth voltage source is VCC2V5.

[0018] Specifically, the UW analog-to-digital converter circuit includes resistors R27, R28, R29, and R30, a comparator chip U2B, a tenth voltage source, and an eleventh voltage source. One end of resistor R27 is connected to the U(uw) signal, and the other end is connected to the non-inverting input of the comparator chip U2B. One end of resistor R28 is connected to the tenth voltage source, and the other end is connected to the inverting input of the comparator chip U2B. The output of the comparator chip U2B outputs the AD(uw) signal, which is a second digital signal. The AD(uw) signal is connected to the MCU main control unit. One end of resistor R29 is connected to the node between resistor R27 and the non-inverting input of the comparator chip U2B, and the other end is connected to the output of the comparator chip U2B. One end of resistor R30 is connected to the eleventh voltage source, and the other end is connected to the output of the comparator chip U2B.

[0019] Specifically, the tenth voltage source is VCC2V5, and the eleventh voltage source is VCC5V.

[0020] The beneficial effects of this utility model are:

[0021] 1. This invention converts analog signals U(uv) and U(uw) into digital square wave signals AD(uv) and AD(uw) by comparing the magnitudes of voltages U and V, and U and W. This conversion method can clearly distinguish between high and low voltage states, ensuring the accuracy and reliability of the signal.

[0022] 2. The frequencies of the digital signals AD(uv) and AD(uw) output by this invention are the same as the residual voltage frequency induced by the motor stator. Maintaining this synchronous frequency ensures the real-time performance and accuracy of the signals, accurately reflecting the actual operating state of the motor. Simultaneously, by calculating the phase relationship between these two digital signals through the MCU main control unit, the current direction of motor rotation can be accurately determined. This precise phase relationship provides crucial data support for the accelerated start-up of the motor, ensuring that the motor can start quickly from its original speed, reducing start-up time and improving operating efficiency.

[0023] 3. This invention monitors residual pressure in real time and converts it into a digital signal, enabling the MCU main control unit to accurately determine the motor's direction and speed based on this data. Therefore, when the motor restarts, it controls the motor to accelerate from its original speed. This rapid start-up response significantly reduces passenger waiting time and improves the user experience.

[0024] 4. The voltage detection circuit of this invention can effectively avoid safety hazards caused by residual voltage, such as the risk of electric shock. By accurately detecting and processing residual voltage, the safe operation of the motor system is ensured. At the same time, the digital signal output method of this invention reduces the possibility of signal interference and misjudgment, improving the reliability and stability of the system. This improvement in reliability and safety provides a guarantee for the long-term stable operation of the elevator system. Attached Figure Description

[0025] Figure 1 This is a block diagram of the main circuit of this utility model;

[0026] Figure 2 This is a circuit diagram of the UV proportional calculation circuit of this utility model;

[0027] Figure 3 This is a circuit diagram of the UV analog-to-digital converter circuit of this utility model;

[0028] Figure 4 This is a circuit diagram of the UW proportional operation circuit of this utility model;

[0029] Figure 5 This is a circuit diagram of the UW analog-to-digital converter circuit of this utility model;

[0030] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] like Figure 1 As shown, an elevator motor voltage detection circuit includes:

[0033] The UV proportional operation circuit has its signal sampling port connected to the U-phase and V-phase ports of the motor. It is used to perform proportional operation on the voltage between the U-phase and V-phase and output a first analog voltage signal.

[0034] The UV analog-to-digital converter circuit has its input terminal connected to the output terminal of the UV proportional operation circuit, and is used to convert the first analog voltage signal into a first digital signal.

[0035] The UW proportional operation circuit has its signal sampling port connected to the U-phase and W-phase ports of the motor. It is used to perform proportional operation on the voltage between the U-phase and W-phase and output a second analog voltage signal.

[0036] The UW analog-to-digital converter circuit has its input terminal connected to the output terminal of the UW proportional operation circuit, and is used to convert the second analog voltage signal into a second digital signal.

[0037] The MCU main control unit has its input terminals connected to the output terminals of the UV analog-to-digital converter circuit and the UW analog-to-digital converter circuit, respectively. It is used to receive the first digital signal and the second digital signal, and calculate the current running direction and frequency of the motor based on the first digital signal and the second digital signal to complete the speed tracking function. When the motor is restarted, it controls the motor to accelerate from the original speed.

[0038] like Figure 2 As shown, the UV proportional operation circuit includes proportional resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, feedback resistor R11, operational amplifier chip U1A, filter capacitor C1, filter capacitor C2, first voltage source, second voltage source, third voltage source, and fourth voltage source. The U-phase port of the motor is connected to the non-inverting input terminal of the operational amplifier chip U1A after connecting proportional resistors R1, R2, R3, and R4 in series. The V-phase port of the motor is connected to the inverting input terminal of the operational amplifier chip U1A after connecting proportional resistors R5, R6, R7, and R8 in series. For example, one end of resistor R9 is connected to the node between proportional resistor R4 and the non-inverting input terminal of operational amplifier chip U1A, and the other end is connected to the first voltage source. One end of proportional resistor R10 is connected to the node between proportional resistor R8 and the inverting input terminal of operational amplifier chip U1A, and the other end is connected to the second voltage source. One end of feedback resistor R11 is connected to the output terminal of operational amplifier chip U1A, and the other end is connected to the node between proportional resistor R10 and the inverting input terminal of operational amplifier chip U1A. The output terminal of operational amplifier chip U1A outputs a U(uv) signal, which is the first analog voltage signal. The third voltage source is connected to the positive power supply terminal of operational amplifier chip U1A and grounded through filter capacitor C2. The fourth voltage source is connected to the negative power supply terminal of operational amplifier chip U1A and grounded through filter capacitor C1. The first and second voltage sources are both VCC2V5V, the third voltage source is VCC+15V, and the fourth voltage source is VCC-15V.

[0039] Specifically, the input port of the UV proportional operation circuit is connected to the U and V phases of the motor, and is connected to the positive and negative inputs of the operational amplifier chip U1A through the proportional resistor R1-10. Through the feedback resistor R11, the voltage signal is reduced according to the set ratio, thereby outputting the voltage signal U(uv), which is the first analog voltage signal.

[0040] like Figure 3As shown, the UV analog-to-digital converter circuit includes resistors R12, R13, R14, and R15, comparator chip U2A, filter capacitor C3, a fifth voltage source, a sixth voltage source, and a seventh voltage source. One end of resistor R12 is connected to the U(uv) signal, and the other end is connected to the non-inverting input of comparator chip U2A. One end of resistor R13 is connected to the fifth voltage source, and the other end is connected to the inverting input of comparator chip U2A. The output of comparator chip U2A outputs the AD(uv) signal, which is the first digital signal and is connected to the MCU main control unit. One end of resistor R14 is connected to the node between resistor R12 and the non-inverting input of comparator chip U2A, and the other end is connected to the output of comparator chip U2A. One end of resistor R15 is connected to the sixth voltage source, and the other end is connected to the output of comparator chip U2A. The seventh voltage source is connected to the positive power supply of comparator chip U2A and grounded through filter capacitor C3. The negative power supply of comparator chip U2A is grounded. The fifth voltage source is VCC2V5, the sixth voltage source is VCC5V, and the seventh voltage source is VCC5V.

[0041] Specifically, the U(uv) signal is connected to the positive input of the comparator chip U2A through resistor R12, and compared with the 2.5V voltage of the inverting input to obtain the AD(uv) signal, which is the first digital signal.

[0042] like Figure 4 As shown, the UW proportional operation circuit includes proportional resistors R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, feedback resistor R26, operational amplifier chip U1B, eighth voltage source, and ninth voltage source. The U-phase port of the motor is connected in series with proportional resistors R16, R17, R18, and R19, and then connected to the non-inverting input of operational amplifier chip U1B. The W-phase port of the motor is connected in series with proportional resistors R20, R21, and R22, and then with the feedback resistor R26. For example, resistor R23 is connected to the inverting input of operational amplifier chip U1B. One end of proportional resistor R24 ​​is connected to the eighth voltage source, and the other end is connected to the node between proportional resistor R19 and the non-inverting input of operational amplifier chip U1B. One end of proportional resistor R25 is connected to the ninth voltage source, and the other end is connected to the node between proportional resistor R23 and the inverting input of operational amplifier chip U1B. One end of feedback resistor R26 is connected to the output of operational amplifier chip U1B, and the other end is connected to the node between proportional resistor R25 and the inverting input of operational amplifier chip U1B. The output of operational amplifier chip U1B outputs the U(uw) signal, which is the second analog voltage signal. The eighth voltage source is VCC2V5, and the ninth voltage source is VCC2V5.

[0043] Specifically, the input port of the UW proportional operation circuit is connected to the U and W phases of the motor, and then connected to the positive and negative inputs of the operational amplifier chip U1B through proportional resistors R16-25. After passing through the feedback resistor R26, the voltage signal is reduced according to the set ratio, thereby outputting the voltage signal U(uw), which is the second analog voltage signal.

[0044] like Figure 5 As shown, the UW analog-to-digital converter circuit includes resistors R27, R28, R29, and R30, a comparator chip U2B, a tenth voltage source, and an eleventh voltage source. One end of resistor R27 is connected to the U(uw) signal, and the other end is connected to the non-inverting input of comparator chip U2B. One end of resistor R28 is connected to the tenth voltage source, and the other end is connected to the inverting input of comparator chip U2B. The output of comparator chip U2B outputs the AD(uw) signal, which is a second digital signal connected to the MCU main control unit. One end of resistor R29 is connected to the node between resistor R27 and the non-inverting input of comparator chip U2B, and the other end is connected to the output of comparator chip U2B. One end of resistor R30 is connected to the eleventh voltage source, and the other end is connected to the output of comparator chip U2B. The tenth voltage source is VCC2V5, and the eleventh voltage source is VCC5V.

[0045] Specifically, the U(uw) signal is connected to the positive input of the comparator chip U2B through resistor R27, and compared with the 2.5V voltage of the inverting input to obtain the AD(uw) signal, which is the second digital signal.

[0046] In operation, the UV proportional operation circuit's signal sampling port is connected to the U and V phases of the motor, outputting voltage U(uv) through operational amplifier chip U1A. U(uv) is then connected to the input of the UV analog-to-digital converter circuit, outputting digital signal AD(uv) through comparator chip U2A. Similarly, the UW proportional operation circuit's signal sampling port is connected to the U and W phases of the motor, outputting voltage U(uw) through operational amplifier chip U1B. U(uw) is then connected to the input of the UW analog-to-digital converter circuit, outputting digital signal AD(uw) through comparator chip U2B. AD(uv) and AD(uw) are connected to the MCU main control unit. Through calculation, the current rotation direction and frequency of the motor can be determined, completing the speed tracking function. When the motor restarts, it is controlled to accelerate from the original speed.

[0047] When the voltage U > V, U(u - v) > 2.5V, and AD(u - v) outputs a high level; when the voltage U < V, U(u - v) < 2.5V, and AD(u - v) outputs a low level. Similarly, when the voltage U > W, U(u - w) > 2.5V, and AD(u - w) outputs a high level; when the voltage U < W, U(u - w) < 2.5V, and AD(u - w) outputs a low level. The utility model realizes the conversion of analog signals U, V, and W into digital square wave signals AD(u - v) and AD(u - w). The frequencies of these two digital signals are the same as the residual voltage frequency induced by the motor stator, and their phase relationship can truly reflect the current running direction of the motor through calculation by the MCU main control unit, thereby providing the required data for the motor to accelerate and start.

[0048] The utility model can detect the residual voltage on the motor terminals after the motor is powered off to judge the current running direction and frequency of the motor, complete the speed tracking function, and when the motor starts again, it can accelerate and start based on the original speed.

[0049] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0050] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0051] In the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An elevator motor voltage detection circuit, characterized in that, include: The UV proportional operation circuit has its signal sampling port connected to the U-phase and V-phase ports of the motor. It is used to perform proportional operation on the voltage between the U-phase and V-phase and output a first analog voltage signal. The UV analog-to-digital converter circuit has its input terminal connected to the output terminal of the UV proportional operation circuit, and is used to convert the first analog voltage signal into a first digital signal. The UW proportional operation circuit has its signal sampling port connected to the U-phase and W-phase ports of the motor. It is used to perform proportional operation on the voltage between the U-phase and W-phase and output a second analog voltage signal. The UW analog-to-digital converter circuit has its input terminal connected to the output terminal of the UW proportional operation circuit, and is used to convert the second analog voltage signal into a second digital signal. The MCU main control unit has its input terminals connected to the output terminals of the UV analog-to-digital converter circuit and the UW analog-to-digital converter circuit, respectively. It is used to receive the first digital signal and the second digital signal, and calculate the current running direction and frequency of the motor based on the first digital signal and the second digital signal to complete the speed tracking function. When the motor is restarted, it controls the motor to accelerate from the original speed.

2. The elevator motor voltage detection circuit according to claim 1, characterized in that, The UV proportional operation circuit includes proportional resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, feedback resistor R11, operational amplifier chip U1A, filter capacitors C1 and C2, a first voltage source, a second voltage source, a third voltage source, and a fourth voltage source. The U-phase port of the motor is connected in series with proportional resistors R1, R2, R3, and R4, and then connected to the non-inverting input of operational amplifier chip U1A. The V-phase port of the motor is connected in series with proportional resistors R5, R6, R7, and R8, and then connected to the inverting input of operational amplifier chip U1A. One end of resistor R9 is connected to the node between proportional resistor R4 and the non-inverting input terminal of op-amp chip U1A, and the other end is connected to the first voltage source. One end of proportional resistor R10 is connected to the node between proportional resistor R8 and the inverting input terminal of op-amp chip U1A, and the other end is connected to the second voltage source. One end of feedback resistor R11 is connected to the output terminal of op-amp chip U1A, and the other end is connected to the node between proportional resistor R10 and the inverting input terminal of op-amp chip U1A. The output terminal of op-amp chip U1A outputs a U(uv) signal, which is the first analog voltage signal. The third voltage source is connected to the positive power supply terminal of op-amp chip U1A and grounded through filter capacitor C2. The fourth voltage source is connected to the negative power supply terminal of op-amp chip U1A and grounded through filter capacitor C1.

3. The elevator motor voltage detection circuit according to claim 2, characterized in that, The first and second voltage sources are both VCC2V5, the third voltage source is VCC+15V, and the fourth voltage source is VCC-15V.

4. The elevator motor voltage detection circuit according to claim 2, characterized in that, The UV analog-to-digital converter circuit includes resistors R12, R13, R14, and R15, a comparator chip U2A, a filter capacitor C3, a fifth voltage source, a sixth voltage source, and a seventh voltage source. One end of resistor R12 is connected to the U(uv) signal, and the other end is connected to the non-inverting input of comparator chip U2A. One end of resistor R13 is connected to the fifth voltage source, and the other end is connected to the inverting input of comparator chip U2A. The output of comparator chip U2A outputs the AD(uv) signal, which is the first digital signal and is connected to the MCU main control unit. One end of resistor R14 is connected to the node between resistor R12 and the non-inverting input of comparator chip U2A, and the other end is connected to the output of comparator chip U2A. One end of resistor R15 is connected to the sixth voltage source, and the other end is connected to the output of comparator chip U2A. The seventh voltage source is connected to the positive power supply of comparator chip U2A and grounded through filter capacitor C3. The negative power supply of comparator chip U2A is grounded.

5. The elevator motor voltage detection circuit according to claim 4, characterized in that, The fifth voltage source is VCC2V5, the sixth voltage source is VCC5V, and the seventh voltage source is VCC5V.

6. The elevator motor voltage detection circuit according to claim 1, characterized in that, The UW proportional operation circuit includes proportional resistors R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, feedback resistor R26, operational amplifier chip U1B, eighth voltage source, and ninth voltage source. The U-phase port of the motor is connected in series with proportional resistors R16, R17, R18, and R19, and then connected to the non-inverting input of operational amplifier chip U1B. The W-phase port of the motor is connected in series with proportional resistors R20, R21, and R22, and then with the feedback resistor R26. After resistor R23, it is connected to the inverting input terminal of operational amplifier chip U1B. One end of proportional resistor R24 ​​is connected to the eighth voltage source, and the other end is connected to the node between proportional resistor R19 and the non-inverting input terminal of operational amplifier chip U1B. One end of proportional resistor R25 is connected to the ninth voltage source, and the other end is connected to the node between proportional resistor R23 and the inverting input terminal of operational amplifier chip U1B. One end of feedback resistor R26 is connected to the output terminal of operational amplifier chip U1B, and the other end is connected to the node between proportional resistor R25 and the inverting input terminal of operational amplifier chip U1B. The output terminal of operational amplifier chip U1B outputs the U(uw) signal, which is the second analog voltage signal.

7. The elevator motor voltage detection circuit according to claim 6, characterized in that, The eighth voltage source is VCC2V5, and the ninth voltage source is VCC2V5.

8. The elevator motor voltage detection circuit according to claim 6, characterized in that, The UW analog-to-digital converter circuit includes resistors R27, R28, R29, and R30, a comparator chip U2B, a tenth voltage source, and an eleventh voltage source. One end of resistor R27 is connected to the U(uw) signal, and the other end is connected to the non-inverting input of comparator chip U2B. One end of resistor R28 is connected to the tenth voltage source, and the other end is connected to the inverting input of comparator chip U2B. The output of comparator chip U2B outputs the AD(uw) signal, which is a second digital signal and is connected to the MCU main control unit. One end of resistor R29 is connected to the node between resistor R27 and the non-inverting input of comparator chip U2B, and the other end is connected to the output of comparator chip U2B. One end of resistor R30 is connected to the eleventh voltage source, and the other end is connected to the output of comparator chip U2B.

9. The elevator motor voltage detection circuit according to claim 8, characterized in that, The tenth voltage source is VCC2V5, and the eleventh voltage source is VCC5V.

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