Three-phase line independent drive control system of three-phase motor

Abstract

The invention discloses a three-phase line independent driving control system of a three-phase motor, which belongs to the technical field of three-phase motor driving control and comprises an auxiliary switching power supply, a microprocessor software motor operation control module and a motor three-phase electromagnetic coil driving module, the motor three-phase electromagnetic coil driving module is provided with a unique bridge type driving structure and a phase current control capacitor unit, the system can reduce the reverse electromotive force of the motor to be half of the conventional electromotive force, the maximum rotating speed and the maximum transmission power are doubled, and the rated power output and the maximum rotating speed can still be ensured when the rated voltage is doubled. The microprocessor software motor operation control module can accurately control the operation state of the motor, all the modules work cooperatively, stable power supply support, accurate control monitoring and efficient driving are achieved, the reliability and stability of the system are improved, and the system is suitable for various industrial and battery power supply scenes and has wide application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of three-phase motor drive control, and in particular relates to a three-phase motor three-phase line independent drive control system. Background Art

[0002] In today's industrial and technological fields, three-phase motors are an important power device and are widely used in many occasions. The quality of their performance directly affects the operating efficiency and reliability of the entire system. With the continuous development of technology, higher and higher requirements are put forward for three-phase motor drive control systems, especially in battery-powered application scenarios, which face many challenges.

[0003] Conventional battery-powered DC three-phase permanent magnet motor drive control systems have significant limitations in actual operation. Traditional motor drive control methods usually adopt a mode of supplying power to the two-phase electromagnetic wires of the motor in series, and common connection methods include Y-type and triangle connection. During the operation of the motor, a reverse electromotive force will be generated on the three-phase winding, and its magnitude will continue to increase with the increase of the motor speed. When the motor speed reaches a certain level, the reverse electromotive force after the two-phase electromagnetic wires are connected in series will gradually approach the operating power supply voltage of the motor. At this time, due to the decrease in the voltage difference between the power supply voltage and the reverse electromotive force, it is difficult for the current to continue to increase and enter the phase winding of the motor. The emergence of this situation makes it impossible to further increase the speed and transmission power of the motor, which seriously restricts the performance of the motor. In addition, the battery supply voltage is not constant, but gradually decreases during use. This feature further exacerbates the severity of the problem, because as the battery supply voltage decreases, the maximum speed and maximum transmission power of the motor will gradually decrease. Especially when using batteries with a wider effective operating voltage range such as sodium ion batteries, the problem is more prominent. Taking a 48V sodium-ion battery as an example, its effective operating voltage range is 25V-58V. Even if a constant voltage power supply is used, due to the series power supply structure of the conventional drive control system, the motor speed and transmission power are still greatly limited by the phase line back electromotive force.

[0004] In this context, how to effectively reduce the reverse electromotive force of the motor during operation while maintaining the stable working condition of the motor, thereby expanding the effective power supply voltage range of the motor and increasing the maximum speed and maximum transmission power of the motor, has become a key problem that technicians in this field urgently need to solve. Based on this technical status, the present invention proposes an innovative three-phase motor three-phase line independent drive control system, which aims to overcome the defects of the prior art and bring new breakthroughs and improvements to the field of three-phase motor drive control. Summary of the invention

[0005] The object of the present invention is to provide a three-phase motor three-phase line independent drive control system to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a three-phase motor three-phase line independent drive control system, characterized in that it includes:

[0007] Auxiliary switch power supply module, which is connected to the input DC power supply and the microprocessor software motor operation control module respectively, and is used to provide power support for the system;

[0008] Microprocessor software motor operation control module, including:

[0009] A motor rotor position sensor input unit, used to obtain a motor rotor position signal;

[0010] Motor temperature sensor input unit, used to monitor motor temperature;

[0011] The motor running current control unit is used to control the motor working state according to the detected motor running current related parameters; the microprocessor software motor running control module is respectively connected to the input DC power supply and the motor three-phase electromagnetic coil drive module;

[0012] The motor three-phase electromagnetic coil drive module includes:

[0013] The unit is composed of three bridge circuits connected in parallel, and its driving circuit is a bridge drive structure with three groups (QA1, QA2, QA3, QA4; QB1, QB2, QB3, QB4; QC1, QC2, QC3, QC4) connected in parallel. The three-phase electromagnetic wires LA, LB, and LC of the motor are independently connected to the bridge arms of the three groups of parallel bridges.

[0014] The motor phase current control capacitor unit includes a first capacitor C1 and second capacitors C2 and C3. The positive electrodes of the first capacitor and the second capacitor are connected to the positive electrode of the input power supply, the negative electrode of the first capacitor is connected to the negative electrode of the power supply, and the negative electrodes of the second capacitors C2 and C3 are connected to point P1. The motor three-phase electromagnetic coil drive module is connected to the input DC power supply and the microprocessor software motor operation control module.

[0015] Preferably, the auxiliary switch power supply module is capable of converting the input DC power supply into a voltage suitable for the operation of the microprocessor software motor operation control module.

[0016] Preferably, the motor rotor position sensor input unit can accurately acquire the motor rotor position signal in real time and transmit it to the microprocessor software motor operation control module for processing.

[0017] Preferably, the motor temperature sensor input unit can continuously monitor the motor temperature during the operation of the motor, and send out an alarm signal or take corresponding protective measures when the temperature exceeds a preset range.

[0018] Preferably, the motor running current control unit calculates the motor running current by detecting the voltage value on a specific resistor (such as R1) in the circuit, and adjusts the motor running current according to a preset control strategy to achieve precise control of the motor.

[0019] Preferably, the field effect tubes in the three-way bridge circuit parallel component unit realize independent drive control of the three-phase electromagnetic coils of the motor under the action of the timing drive signal output by the microprocessor software motor operation control module.

[0020] Preferably, the capacitors C2 and C3 in the motor phase current control capacitor unit can stabilize the phase current of the motor, ensuring the normal operation of the motor under different working conditions so that its phase current meets the design requirements.

[0021] Preferably, the system can reduce the back electromotive force of the motor during operation to half of that of the conventional two-phase series connection while keeping the motor operating conditions unchanged, thereby doubling the maximum speed and maximum transmission power of the motor, and ensuring that the motor has rated power output and maximum speed when the rated voltage of the motor is half that of the motor.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Reduction of reverse electromotive force and improvement of performance

[0024] Significantly reduces back EMF

[0025] Under the condition that the motor working condition remains unchanged, this system adopts the innovative method of three-phase independent drive, so that the reverse electromotive force of the motor during operation is only the reverse electromotive force on one phase line. Compared with the conventional two-phase series power supply mode, its reverse electromotive force is reduced by half. This reduction effectively breaks through the bottleneck of the reverse electromotive force limiting the motor performance in the traditional drive control method.

[0026] Significantly improve the maximum speed and maximum transmission power

[0027] Due to the reduction of reverse electromotive force, the motor can obtain a higher effective supply voltage range during operation. This greatly increases the maximum speed and maximum transmission power of the motor, both of which are increased to twice that of conventional drive control methods. For example, under the same input power conditions, the motor driven by this system can reach a higher speed than the traditional system, thereby showing excellent performance advantages in application scenarios that require high-speed operation. At the same time, it can also meet higher load requirements in terms of transmission power, greatly expanding the application range of the motor.

[0028] 2. Adapt to low rated voltage operation

[0029] Rated voltage adaptability is enhanced

[0030] The unique design of this system enables the motor to maintain rated power output and maximum speed even when the rated voltage is half of the rated voltage. This feature is of great significance in practical applications, especially in battery-powered scenarios. As the battery power is consumed, the voltage gradually decreases, but the motor can still maintain stable high-performance operation. Taking sodium-ion batteries as an example, their effective operating voltage range is wide and the voltage variation is large. This system can adapt well to this voltage change, ensuring that the motor can work normally at different voltage stages, reducing the problem of motor performance degradation caused by voltage drop, and improving the reliability and stability of the entire system.

[0031] 3. Accurate motor control and protection

[0032] Precise motor operation control

[0033] The motor rotor position sensor input unit in the microprocessor software motor operation control module can accurately obtain the motor rotor position signal in real time and transmit it to the microprocessor for processing in a timely manner. Based on this, the microprocessor can accurately control the motor's operating state, such as starting, stopping, speed regulation and other operations, making the motor run more smoothly and accurately, and improving the motor's control accuracy and response speed.

[0034] The motor running current control unit accurately calculates the motor running current by detecting the voltage value on a specific resistor (such as R1) in the circuit, and adjusts the motor running current in real time according to the preset control strategy. This precise control can ensure that the motor can operate in the best state under different load conditions, avoiding problems such as motor overheating and reduced efficiency caused by excessive or insufficient current, effectively extending the service life of the motor and improving the overall efficiency of the system.

[0035] Reliable motor temperature monitoring and protection

[0036] The motor temperature sensor input unit continuously monitors the motor temperature during the operation of the motor. When the temperature exceeds the preset range, the system can promptly issue an alarm signal to remind the operator to check and handle it. At the same time, the system can also take corresponding protective measures, such as automatically reducing the motor load or stopping the motor operation to prevent the motor from being damaged due to overheating, further improving the safety and reliability of the motor operation.

[0037] 4. Phase current stability and system reliable operation

[0038] Stable phase current guarantee

[0039] The motor phase current control capacitor unit (including capacitors C2 and C3) in the motor three-phase electromagnetic coil drive module can effectively stabilize the motor phase current. Under different motor working conditions, whether it is starting, accelerating, steady-state operation or load changes, capacitors C2 and C3 can ensure that the phase current meets the design requirements, avoiding problems such as motor torque pulsation and unstable operation caused by excessive phase current fluctuations, providing a strong guarantee for the stable and reliable operation of the motor.

[0040] Improved overall system reliability

[0041] Each module works together, the auxiliary switch power supply module provides stable power support for the entire system, the microprocessor software motor operation control module realizes precise control and monitoring protection, and the motor three-phase electromagnetic coil drive module ensures efficient motor drive. This organic combination makes the entire three-phase motor three-phase line independent drive control system more reliable and stable, reduces the probability of system failure, reduces maintenance costs, and increases the overall service life of the equipment. It has broad application prospects and practical value in industrial production and various application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the circuit principle of the present invention;

[0043] Figure 2 It is a schematic diagram of the square wave timing output driven by the microprocessor software motor operation control module of the present invention (sine wave control can also be output). DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1-Figure 2 The present invention provides a three-phase motor three-phase line independent drive control system, characterized in that it includes:

[0046] Auxiliary switch power supply module, which is connected to the input DC power supply and the microprocessor software motor operation control module respectively, and is used to provide power support for the system;

[0047] Microprocessor software motor operation control module, including:

[0048] A motor rotor position sensor input unit, used to obtain a motor rotor position signal;

[0049] Motor temperature sensor input unit, used to monitor motor temperature;

[0050] The motor running current control unit is used to control the motor working state according to the detected motor running current related parameters; the microprocessor software motor running control module is respectively connected to the input DC power supply and the motor three-phase electromagnetic coil drive module;

[0051] The motor three-phase electromagnetic coil drive module includes:

[0052] The unit is composed of three bridge circuits connected in parallel, and its driving circuit is a bridge drive structure with three groups (QA1, QA2, QA3, QA4; QB1, QB2, QB3, QB4; QC1, QC2, QC3, QC4) connected in parallel. The three-phase electromagnetic wires LA, LB, and LC of the motor are independently connected to the bridge arms of the three groups of parallel bridges.

[0053] The motor phase current control capacitor unit includes a first capacitor C1 and second capacitors C2 and C3. The positive electrodes of the first capacitor and the second capacitor are connected to the positive electrode of the input power supply, the negative electrode of the first capacitor is connected to the negative electrode of the power supply, and the negative electrodes of the second capacitors C2 and C3 are connected to point P1. The motor three-phase electromagnetic coil drive module is connected to the input DC power supply and the microprocessor software motor operation control module.

[0054] Furthermore, the auxiliary switch power supply module provides the entire system with an adaptive power supply, ensuring the normal operation of each module and laying the foundation for the stable operation of the system. It can convert the input DC power supply into a voltage suitable for the microprocessor software motor operation control module, ensuring the precise operation of the control module and achieving effective control of the motor.

[0055] The microprocessor software motor operation control module integrates multiple key units. The position signal obtained by the motor rotor position sensor input unit provides basic data for precise motor control, realizes smooth motor start, stop and speed regulation, and improves the smoothness and accuracy of motor operation; the motor temperature sensor input unit monitors the temperature in real time to prevent the motor from overheating and enhance operational safety and reliability; the motor operation current control unit adjusts the current according to the detection parameters to keep the motor in the best state under different loads, extend the motor life and improve the overall efficiency of the system.

[0056] The motor three-phase electromagnetic coil drive module has a unique structural design. The three-phase electromagnetic wires are independently connected. The three-way bridge circuit parallel unit and the motor phase current control capacitor unit work together to effectively reduce the reverse electromotive force, greatly improve the maximum speed and maximum transmission power of the motor, and can still guarantee the rated power output and maximum speed when the rated voltage is reduced by half. At the same time, the phase current is stabilized to ensure the stable operation of the motor under various working conditions.

[0057] The modules are tightly connected to each other, achieving effective transmission and interaction of signals and electric energy, and working in coordination to improve the reliability and stability of the entire system, reduce the probability of failure, reduce maintenance costs, and extend the service life of equipment. It has broad prospects and practical value in many application scenarios.

[0058] In this embodiment, the auxiliary switch power supply module can convert the input DC power supply into a voltage suitable for the operation of the microprocessor software motor operation control module.

[0059] Furthermore, the auxiliary switching power supply module converts the input DC power supply into a voltage suitable for the microprocessor software motor operation control module. This function is crucial for the stable operation of the microprocessor. The stable voltage supply avoids the abnormal operation of the microprocessor due to power supply voltage fluctuations, such as program errors, unstable control signals and other problems. This ensures that the microprocessor can accurately execute the motor control algorithm, output accurate control signals, and achieve precise control of the motor operation status. In applications with high requirements for motor control accuracy, such as precision equipment drive motors on automated production lines, a stable voltage supply helps improve product processing accuracy and production efficiency and reduce the defective rate.

[0060] In this embodiment, the motor rotor position sensor input unit can accurately obtain the motor rotor position signal in real time and transmit it to the microprocessor software motor operation control module for processing.

[0061] Furthermore, the motor rotor position sensor input unit can accurately obtain the motor rotor position signal in real time and quickly transmit it to the microprocessor software motor operation control module for processing. This provides key information for the precise control of the motor. Based on these signals, the microprocessor can accurately calculate the motor's speed, direction and other operating parameters, and then generate corresponding precise control signals. During the motor startup phase, the optimal startup strategy can be determined based on the initial position of the rotor to achieve smooth and low-impact startup; during operation, the control signal is adjusted in real time to achieve fast and accurate speed regulation and commutation operations, significantly improving the motor's response speed and control accuracy. This enables the motor to better adapt to various complex work requirements. For example, in CNC machine tools, precise motor control can ensure processing accuracy and surface quality.

[0062] In this embodiment, the motor temperature sensor input unit can continuously monitor the motor temperature during the operation of the motor, and send out an alarm signal or take corresponding protective measures when the temperature exceeds a preset range.

[0063] Furthermore, the motor temperature sensor input unit continuously monitors the motor temperature during motor operation. When the temperature exceeds the preset range, an alarm signal is issued in time or corresponding protective measures are taken. This feature effectively prevents the motor from being damaged due to overheating and greatly extends the service life of the motor. In industrial production, many equipment need to run continuously for a long time, such as large ventilation systems, water pump units, etc. Motor overheating may cause equipment failure, production interruption and even fire and other serious consequences. The temperature monitoring and protection function can detect temperature anomalies in time and take measures in advance, such as reducing the load or stopping operation, to ensure the safe and reliable operation of the motor and reduce the economic losses and safety risks caused by motor failure.

[0064] In this embodiment, the motor running current control unit calculates the motor running current by detecting the voltage value on a specific resistor (such as R1) in the circuit, and adjusts the motor running current according to a preset control strategy to achieve precise control of the motor.

[0065] Furthermore, the motor running current control unit accurately calculates the motor running current by detecting the voltage value on a specific resistor (such as R1) in the circuit, and adjusts the current in real time according to the preset control strategy. This precise control enables the motor to maintain the best working state under different load conditions. When the motor is lightly loaded, the current input can be appropriately reduced to reduce energy loss and improve energy utilization; when overloaded, the current supply is increased in time to ensure that the motor outputs sufficient torque and maintains stable operation. At the same time, through rapid response and adjustment to current fluctuations, problems such as motor overheating and reduced efficiency caused by excessive current and insufficient power caused by too small current are avoided. In application scenarios where the load changes frequently, such as cranes, elevators and other equipment, this function can ensure that the motor always operates efficiently and stably, improving the overall performance and reliability of the system.

[0066] In this embodiment, the field effect tubes in the three-way bridge circuit parallel component unit realize independent drive control of the three-phase electromagnetic coils of the motor under the action of the timing drive signal output by the microprocessor software motor operation control module.

[0067] Furthermore, the field effect tubes in the three-way bridge circuit parallel component unit realize independent drive control of the three-phase electromagnetic coils of the motor under the action of the timing drive signal output by the microprocessor software motor operation control module. This independent drive mode breaks the limitations of the traditional two-phase line series power supply mode, so that each phase of the electromagnetic coil can obtain accurate current and voltage supply according to the actual operation requirements of the motor. In the motor startup phase, soft start can be achieved. By controlling the current rise rate of each phase of the electromagnetic coil separately, the startup impact is effectively reduced, the wear on the mechanical parts of the motor is reduced, and the service life of the motor is extended. During the operation of the motor, whether in steady-state operation or in response to load changes, the drive state of each phase of the electromagnetic coil can be adjusted quickly and accurately, the dynamic response performance of the motor is improved, and the motor can be more flexibly and efficiently adapted to various complex working conditions. For example, in industrial equipment with frequent start-stop and speed changes, the operation stability and production efficiency of the equipment can be significantly improved.

[0068] In this embodiment, the capacitors C2 and C3 in the motor phase current control capacitor unit can stabilize the phase current of the motor, ensuring the normal operation of the motor under different working conditions, so that its phase current meets the design requirements.

[0069] Furthermore, the capacitors C2 and C3 in the motor phase current control capacitor unit can stabilize the phase current of the motor, ensure the normal operation of the motor under different working conditions, and make its phase current meet the design requirements. At the moment of motor starting, the capacitor can provide additional current compensation for the electromagnetic coil, help the motor overcome the starting resistance, achieve smooth starting, and avoid motor starting failure or jitter caused by insufficient starting current. During the acceleration process of the motor, the capacitor can smooth the current change and prevent the current mutation from damaging the motor. During steady-state operation, the capacitor continuously stabilizes the phase current, avoids current fluctuations caused by power supply fluctuations or other interference factors, ensures the stability of the motor output torque, and improves the reliability and stability of the motor operation. When the motor load changes, the capacitor can respond quickly, suppress the fluctuation of the phase current, and prevent the motor torque pulsation and unstable operation caused by excessive phase current fluctuations. It ensures that the motor can operate stably under different load conditions, which is of great significance for applications with high requirements for motor operation stability, such as precision instruments and equipment, automated production lines, etc.

[0070] In this embodiment, the system can reduce the back electromotive force of the motor during operation to half of that of the conventional two-phase series connection without changing the motor operating conditions, thereby increasing the maximum speed and maximum transmission power of the motor by one time, and when the rated voltage of the motor is half, ensuring that the motor has the rated power output and maximum speed.

[0071] Furthermore, the system can reduce the reverse electromotive force of the motor to half of that of the conventional two-phase series connection when the motor working condition remains unchanged. This feature directly breaks through the bottleneck of the reverse electromotive force on the motor performance in the traditional drive control method. Due to the reduction of reverse electromotive force, the motor can obtain a higher effective power supply voltage range during operation, so that the maximum speed and maximum transmission power of the motor can be greatly improved, both to twice that of the conventional drive control method. For example, under the same input power conditions, the motor driven by this system can reach a higher speed than the traditional system. In application scenarios that require high-speed operation, such as high-speed centrifuges, fans and other equipment, it can significantly improve the working efficiency and performance of the equipment. At the same time, it can also meet higher load requirements in terms of transmission power, greatly expanding the application range of the motor.

[0072] In addition, the system can still guarantee the rated power output and maximum speed when the rated voltage of the motor is half of that of the motor. This feature has great advantages in battery-powered scenarios. Taking sodium-ion batteries as an example, their effective operating voltage range is wide and the voltage variation is large. This system can adapt well to such voltage changes. As the battery power is gradually consumed and the voltage drops, the motor can still maintain stable high-performance operation, reducing the problem of motor performance degradation caused by voltage drop, improving the adaptability and reliability of the entire system to battery voltage changes, extending the effective working time of battery-powered equipment, reducing the impact of battery performance changes on equipment operation, and enhancing the applicability and stability of the equipment under different power supply conditions.

[0073] The working principle and use process of the present invention:

[0074] 1. System startup phase

[0075] When the input DC power supply is connected, the auxiliary switch power supply module starts to work. It converts the input DC power supply into a voltage suitable for the microprocessor software motor operation control module to provide stable power support for the startup of the entire system.

[0076] The microprocessor software motor operation control module is initialized, and the motor rotor position sensor input unit, the motor temperature sensor input unit and the motor operation current control unit all enter a ready state, waiting to receive and process relevant signals.

[0077] 2. Motor starting process

[0078] The motor rotor position sensor input unit acquires the initial position signal of the motor rotor in real time and accurately, and transmits it to the microprocessor software motor operation control module.

[0079] The microprocessor software motor operation control module calculates the appropriate timing drive signal based on the received motor rotor position signal and the preset startup strategy, and then outputs the timing drive signal to the motor three-phase electromagnetic coil drive module.

[0080] In the motor three-phase electromagnetic coil drive module, the field effect tubes (QA1-QA4, QB1-QB4, QC1-QC4) of the three-way bridge circuit parallel unit start to conduct and cut off under the action of the timing drive signal, and provide current paths for the motor three-phase electromagnetic wires LA, LB, and LC in a specific order, so that the motor starts. At this time, the motor phase current control capacitor unit (capacitors C2 and C3) starts to play a role, stabilizing the phase current when the motor starts, ensuring that the motor can start smoothly and avoiding damage to the motor caused by excessive impact current.

[0081] 3. Motor operation stage

[0082] After the motor starts, it enters the normal operation state. The motor rotor position sensor input unit continuously monitors the motor rotor position signal and transmits it to the microprocessor software motor operation control module in real time. The microprocessor accurately calculates the motor's speed, direction and other operating parameters based on these signals, and then generates the corresponding timing drive signal according to the preset control algorithm, dynamically adjusts the on and off state of the field effect tube, and realizes precise control of the motor speed and direction.

[0083] The motor running current control unit calculates the motor running current in real time by detecting the voltage value on a specific resistor (such as R1) in the circuit. The calculated current value is compared with the preset current threshold, and the output timing drive signal is adjusted according to the comparison result, thereby achieving precise control of the motor running current. For example, when it is detected that the motor running current is too large, the microprocessor will adjust the drive signal to appropriately reduce the input power of the motor to prevent the motor from overheating and damage; when the motor load changes and causes current fluctuations, the drive signal is adjusted in time to restore the current to stability, ensuring that the motor always runs in the best working state and improving the overall efficiency of the system.

[0084] The motor temperature sensor input unit continuously monitors the motor temperature during the operation of the motor. Once the motor temperature is detected to be beyond the preset range, an alarm signal is immediately sent to the microprocessor software motor operation control module. After receiving the signal, the microprocessor can send an abnormal temperature alarm to external devices (such as display screens, alarms, etc.) to remind the operator to pay attention; on the other hand, according to the preset temperature protection strategy, take corresponding protection measures, such as automatically reducing the motor load, reducing the heat generated by the motor, or directly stopping the motor when the temperature is too high to prevent the motor from being damaged due to overheating and ensure the safety and reliability of the motor operation.

[0085] 4. Adaptation process to different working conditions

[0086] When the motor load changes, the motor operating current will change accordingly. The motor operating current control unit detects the current change in time and feeds back the information to the microprocessor software motor operation control module. The microprocessor adjusts the output timing drive signal according to the new current information and the preset load adaptation algorithm, changes the driving mode of the motor's three-phase electromagnetic coil, ensures that the motor can operate stably under different load conditions and maintain high efficiency, and the phase current control capacitor unit continuously stabilizes the motor's phase current to avoid problems such as motor torque pulsation and unstable operation caused by excessive phase current fluctuations caused by load changes.

[0087] When the battery supply voltage gradually decreases (for example, when using sodium ion batteries, the voltage gradually decreases from 58V to 25V during use), due to the unique three-phase independent drive design of this system, the reverse electromotive force of the motor during operation is only the reverse electromotive force on one phase line, which is half the conventional two-phase series power supply mode, so that the motor can still maintain a higher effective supply voltage range at a lower voltage. Even if the battery voltage drops, the motor can still guarantee the rated power output and maximum speed when the rated voltage is half, and run stably at different voltage stages, reducing the problem of motor performance attenuation caused by voltage drop, and improving the adaptability and reliability of the entire system to battery voltage changes.

[0088] 5. System shutdown phase

[0089] When a stop command is received (which may be a stop signal manually issued by an operator or automatically triggered by the system according to a preset stop condition), the microprocessor software motor operation control module stops outputting the timing drive signal.

[0090] The field effect tubes in the motor three-phase electromagnetic coil drive module are all turned off after losing the drive signal, the current path of the motor three-phase electromagnetic wires LA, LB, and LC is cut off, and the motor stops running.

[0091] When the system enters the standby state, the auxiliary switch power supply module can continue to maintain the power supply to the microprocessor software motor operation control module, so that it can maintain the standby monitoring state and wait for the next startup command, or when it is not used for a long time, it can turn off part or all of the power supply according to the preset power management strategy to reduce the system power consumption. The entire operation process reflects the collaborative working principle between the modules of the three-phase motor three-phase line independent drive control system, as well as the system's ability to accurately control, protect and adapt to various working conditions of the motor at different stages, ensuring the efficient, stable and safe operation of the motor.

[0092] The electronic components and modules used in the invention can be parts commonly used in the market and can realize the specific functions in this case, and the specific models and sizes can be selected and adjusted according to actual needs.

[0093] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A three-phase motor three-phase line independent drive control system, characterized in that: include: Auxiliary switch power supply module, which is connected to the input DC power supply and the microprocessor software motor operation control module respectively, and is used to provide power support for the system; Microprocessor software motor operation control module, including: A motor rotor position sensor input unit, used to obtain a motor rotor position signal; Motor temperature sensor input unit, used to monitor motor temperature; The motor running current control unit is used to control the motor working state according to the detected motor running current related parameters; the microprocessor software motor running control module is respectively connected to the input DC power supply and the motor three-phase electromagnetic coil drive module; The motor three-phase electromagnetic coil drive module includes: The unit is composed of three bridge circuits connected in parallel, and its driving circuit is a bridge drive structure with three groups (QA1, QA2, QA3, QA4; QB1, QB2, QB3, QB4; QC1, QC2, QC3, QC4) connected in parallel. The three-phase electromagnetic wires LA, LB, and LC of the motor are independently connected to the bridge arms of the three groups of parallel bridges. The motor phase current control capacitor unit includes a first capacitor C1 and second capacitors C2 and C3. The positive electrodes of the first capacitor and the second capacitor are connected to the positive electrode of the input power supply, the negative electrode of the first capacitor is connected to the negative electrode of the power supply, and the negative electrodes of the second capacitors C2 and C3 are connected to point P1. The motor three-phase electromagnetic coil drive module is connected to the input DC power supply and the microprocessor software motor operation control module.

2. A three-phase motor three-phase line independent drive control system according to claim 1, characterized in that: The auxiliary switch power supply module can convert the input DC power supply into a voltage suitable for the operation of the microprocessor software motor operation control module.

3. A three-phase motor three-phase line independent drive control system according to claim 1, characterized in that: The motor rotor position sensor input unit can accurately obtain the motor rotor position signal in real time and transmit it to the microprocessor software motor operation control module for processing.

4. A three-phase motor three-phase line independent drive control system according to claim 1, characterized in that: The motor temperature sensor input unit can continuously monitor the motor temperature during the operation of the motor, and send out an alarm signal or take corresponding protective measures when the temperature exceeds a preset range.

5. A three-phase motor three-phase line independent drive control system according to claim 1, characterized in that: The motor running current control unit calculates the motor running current by detecting the voltage value on a specific resistor (such as R1) in the circuit, and adjusts the motor running current according to a preset control strategy to achieve precise control of the motor.

6. A three-phase motor three-phase line independent drive control system according to claim 1, characterized in that: The field effect tubes in the three-way bridge circuit parallel-connected unit realize independent drive control of the three-phase electromagnetic coils of the motor under the action of the timing drive signal output by the microprocessor software motor operation control module.

7. A three-phase motor three-phase line independent drive control system according to claim 1, characterized in that: The capacitors C2 and C3 in the motor phase current control capacitor unit can stabilize the phase current of the motor, ensure the normal operation of the motor under different working conditions, and make its phase current meet the design requirements.

8. A three-phase motor three-phase line independent drive control system according to claim 1, characterized in that: The system can reduce the back electromotive force of the motor during operation to half of that of the conventional two-phase series connection while keeping the motor operating conditions unchanged, thereby doubling the motor's maximum speed and maximum transmission power, and ensuring that the motor has rated power output and maximum speed when the motor's rated voltage is half that of the motor.

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