Single-phase unit modular motor system

Abstract

Single-phase unit modular motor system belongs to the technical field of motor. The single-phase unit modular motor system is aimed at the problem that the existing single-structure three-phase starting generator is not easy to be cut off in case of failure and causes system oscillation when switching between the electric and power generation states. The single-phase unit modular motor system comprises a multi-module motor structure composed of n single-phase motor units; each single-phase motor unit comprises a direct current power supply, a direct current / direct current converter, an H-bridge inverter and a single-phase motor module; each single-phase motor module is configured with a single-phase winding; the n single-phase motor modules adopt a multi-stator winding common rotor structure; in the electric state, the direct current / direct current converter is turned on to become a wire, and the direct current power supply realizes inverter driving of the single-phase motor module through the H-bridge inverter; in the power generation state, the H-bridge inverter enters a non-controlled rectification state, and the electric energy output by the single-phase motor module is rectified through the H-bridge inverter and then output after energy conversion through the direct current / direct current converter. The single-phase unit modular motor system can realize seamless connection from the electric mode to the power generation mode.

Description

Technical Field

[0001] This invention relates to a single-phase modular motor system and belongs to the field of motor technology. Background Technology

[0002] Existing modular motors consist of multiple single-phase winding coils, offering advantages such as good fault tolerance, high reliability, high power density, and ease of engineering implementation, leading to their widespread application in energy-constrained systems like aerospace and special vehicles. However, the different modules of the more commonly used three-phase modular motors cannot be independently controlled, making the switching process between power generation and motoring complex and resulting in poor reliability.

[0003] In existing modular motors, the rapid changes in power demand during the switching between starting and power generation can cause the prime mover to idle. Therefore, ensuring a fast, reliable, and smooth transition from motoring to power generation is crucial for starting generator systems. Traditional methods use a single drive system for the same motor to simultaneously achieve both motoring and power generation, employing software control algorithms to achieve a gradual switch from motoring to power generation. This switching method can cause system oscillations in the transition region and affect the real-time response during the hysteresis interval. Furthermore, a fault in any phase can cause the entire unit to stop operating. Summary of the Invention

[0004] To address the problems of existing single-structure three-phase starter generators, such as difficulty in fault disconnection and system oscillation caused by switching between motoring and generating states using the same motor system, this invention provides a single-phase modular motor system.

[0005] The present invention provides a single-phase modular motor system comprising n single-phase motor units, which constitute a multi-module motor structure; each single-phase motor unit includes a DC power supply, a DC / DC converter, an H-bridge inverter, and a single-phase motor module; each single-phase motor module is configured with a single-phase winding;

[0006] n single-phase motor modules adopt a multi-stator winding, common rotor structure;

[0007] In motor mode, the DC / DC converter is turned on and becomes a conductor, and the DC power supply drives the single-phase motor module through the H-bridge inverter.

[0008] In power generation mode, the H-bridge inverter enters uncontrolled rectification mode. The electrical energy output by the single-phase motor module is rectified by the H-bridge inverter and then converted by the DC / DC converter before being output.

[0009] According to the single-phase modular motor system of the present invention, in the starting state of the motor system, p single-phase motor modules that need to be started are selected according to the input power requirements, so that the selected p single-phase motor modules enter the motor working state, and the other np single-phase motor modules are selected as single-phase motor modules for power generation state.

[0010] Once the rotor reaches the set speed, the number q of single-phase motor modules that need to be put into power generation mode is determined based on the current output power requirement. If q is less than or equal to np, then q single-phase motor modules are selected from the candidate single-phase motor modules for power generation mode to be put into power generation mode; otherwise, all candidate single-phase motor modules for power generation mode are selected to be put into power generation mode, and at the same time, some or all of the p single-phase motor modules are selected to be put into power generation mode.

[0011] According to the single-phase modular motor system of the present invention, when the rotor reaches the set speed, if q is less than or equal to np, the torque of the p single-phase motor modules is slowly reduced until the motor is completely deactivated.

[0012] If q is greater than np, then some or all of the p single-phase motor modules will be switched from the motoring state to the generating state.

[0013] According to the single-phase modular motor system of the present invention, during the operation of the motor system, the single-phase motor module is controlled to switch from motoring state to generator state or from generator state to motoring state according to the increase or decrease demand of output power.

[0014] According to the single-phase modular motor system of the present invention, when a faulty single-phase motor module is present, the faulty single-phase motor module is disconnected, and an unused single-phase motor module is controlled to replace the faulty single-phase motor module and continue to operate.

[0015] According to the single-phase modular motor system of the present invention, the H-bridge inverter realizes the inverter drive of the single-phase motor module based on the bipolar PWM drive method.

[0016] According to the single-phase modular motor system of the present invention, the DC / DC converter is a buck-boost converter.

[0017] According to the single-phase modular motor system of the present invention, the power devices used in the DC / DC converter and H-bridge inverter are IGBTs, MOSFETs, SiC or GaN.

[0018] According to the single-phase modular motor system of the present invention, energy is stored by using an energy storage inductor in the power generation state.

[0019] The beneficial effects of the present invention are as follows: In the motor system described in the present invention, all motor modules are single-phase motors, and the working mode (electric / generating) of the windings of different single-phase motor modules can be switched arbitrarily; the electric state and generating state of each single-phase motor module can also be switched arbitrarily, which can effectively solve the problem of rapid switching between electric and generating states in the motor system, while the response speed is greatly increased and the fault tolerance is significantly improved.

[0020] In this invention's motor system, single-phase motor modules are used as starter generators, and each different single-phase motor module is independently controlled, thus realizing an integrated starter generator drive control system that combines power generation and motoring. It utilizes a modular motor approach to achieve inversion and rectification of different single-phase motor modules, thereby enabling free switching between starting and power generation states. This achieves a seamless transition from motoring to power generation, minimizing torque jitter and response time during the switching process, and ensuring the speed and reliability of mode switching.

[0021] The motor system described in this invention is applicable to power conversion systems that require free conversion of starting and generating energy, such as those used in aerospace, aviation, and new energy vehicle systems. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the single-phase modular motor system described in this invention;

[0023] Figure 2 Taking six single-phase motor units as an example, the circuit structure of the single-phase modular motor system and the schematic diagram of the energy transfer principle in the motoring and generating states are shown; in the figure, modules 1 to 6 correspond to single-phase motor modules 1 to 6.

[0024] Figure 3 This is a schematic diagram showing the switching of the working modes of the six single-phase motor units;

[0025] Figure 4 This is a control flowchart of the single-phase modular motor system described in this invention;

[0026] Figure 5 This is a comparison chart of the selected operation modes of a single-phase motor module: motor mode and generator mode.

[0027] Figure 6 This is a flowchart of the fault operation status control of the single-phase modular motor system described in this invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0031] Specific Implementation Method 1: Combination Figure 1 and Figure 2 As shown, the present invention provides a single-phase modular motor system, comprising n single-phase motor units, which together form a multi-module motor structure; each single-phase motor unit includes a DC power supply, a DC / DC converter, an H-bridge inverter, and a single-phase motor module; each single-phase motor module is configured with a single-phase winding;

[0032] n single-phase motor modules adopt a multi-stator winding, common rotor structure;

[0033] In motor mode, the DC / DC converter is turned on and becomes a conductor, and the DC power supply drives the single-phase motor module through the H-bridge inverter.

[0034] In power generation mode, the H-bridge inverter enters uncontrolled rectification mode. The electrical energy output by the single-phase motor module is rectified by the H-bridge inverter and then converted by the DC / DC converter before being output.

[0035] The single-phase motor module described in this embodiment can adopt a control mode similar to that of a DC motor, and can be used for both electric drive and power generation. The power generation mode of the single-phase motor module is uncontrolled rectification.

[0036] In this embodiment, combined with Figure 1 As shown, single-phase motor modules can be configured into motor systems with 2, 3, 4...n modules.

[0037] Furthermore, combined with Figures 2 to 5 As shown, in the motor system starting state, p single-phase motor modules that need to be started are selected according to the input power requirements, so that the selected p single-phase motor modules enter the motor working state, and the other np single-phase motor modules are selected as single-phase motor modules for power generation state.

[0038] Once the rotor reaches the set speed, the number q of single-phase motor modules that need to be put into power generation mode is determined based on the current output power requirement. If q is less than or equal to np, then q single-phase motor modules are selected from the candidate single-phase motor modules for power generation mode to be put into power generation mode; otherwise, all candidate single-phase motor modules for power generation mode are selected to be put into power generation mode, and at the same time, some or all of the p single-phase motor modules are selected to be put into power generation mode.

[0039] In this embodiment, the drive unit corresponding to each single-phase motor module is completely identical. In motoring mode, the motor torque and speed are in the same direction, driving each single-phase motor module to work, and the driver operates in inverter mode; in generator mode, the power unit becomes a power supply operating mode, realizing bidirectional energy flow, converting the kinetic energy generated by the motor rotation into DC power through uncontrolled rectification, and then through a power electronic converter to achieve boost and buck functions to reach the required DC voltage.

[0040] Furthermore, once the rotor reaches the set speed, if q is less than or equal to np, the torque of the p single-phase motor modules will gradually decrease until they are completely de-energized.

[0041] If q is greater than np, then some or all of the p single-phase motor modules will be switched from the motoring state to the generating state.

[0042] In this embodiment, during the operation of the motor system, the single-phase motor module is controlled to switch from motoring state to generator state or from generator state to motoring state according to the increase or decrease of output power requirements.

[0043] After the motor system starts, several pre-specified single-phase motor modules work. As the speed increases, the generator begins to enter the rectification mode. When the motor reaches the set required speed, it enters the generator state. At this time, the torque of the single-phase motor modules in the motor state gradually decreases until it completely exits the motor state; or, according to the instructions of the host computer, the conversion from the motor state to the generator state is realized.

[0044] When the output power needs to be increased or decreased significantly, the motor system can also add or remove single-phase motor modules according to actual needs, that is, switch different single-phase motor modules to motor mode or generator mode, thereby achieving precise power control.

[0045] The following is a detailed description of this implementation method:

[0046] Combination Figure 2As shown, taking a motor system consisting of six single-phase motor units as an example, the effectiveness of the overall structure of the motor system is illustrated. Ten, twenty, or more single-phase motor units can be selected as needed. The more independent single-phase motor units, the better the fault tolerance and the easier the implementation. Each single-phase motor unit has an independent drive unit, and each driver is constructed using a single-phase full-bridge H-bridge circuit. A DC / DC conversion stage is added between the DC input and the power supply. This conversion stage integrates buck and boost circuits, achieving rapid energy conversion. In motoring mode, the DC / DC conversion stage is activated, and the single-phase motor module is powered by a battery or fixed power supply, using the H-bridge for inverter drive. In generator mode, the H-bridge becomes an uncontrolled rectifier, using the DC / DC conversion unit to convert energy and achieve the required generator voltage. The DC terminal of each power unit can be a generator energy port (e.g., a battery) or a motor energy port (e.g., a DC power supply, a small-power battery pack), and can be configured arbitrarily according to requirements.

[0047] Figure 2 In this design, single-phase motor modules 1, 3, and 5 are used as motoring unit modules, while single-phase motor modules 2, 4, and 6 are used as generator unit modules. Figure 2 As an example, in practical use, any single-phase motor module can be used as the electric motor unit or the generator unit as needed.

[0048] When the motor starts working, it can be operated according to requirements, such as Figure 3 As shown, several single-phase motor modules are configured and set to electric operation mode to drive the motor. After the motor rotates, a voltage is induced in the other winding. When the motor reaches a certain speed and needs to switch to generator mode, the other single-phase motor modules are started directly to enter generator mode. At this time, the single-phase motor modules in electric mode gradually stop working, or gradually switch to generator mode according to the actual working needs of the system. This can achieve a seamless connection from electric to generator mode, minimize torque jitter and response time during the switching process, and thus achieve fast and effective switching between electric and generator modes.

[0049] When the motor system experiences insufficient load during drive operation, the single-phase motor module used for generating electricity can automatically switch to a power module in electric mode. In other words, multiple power modules in electric mode can drive the starter generator to meet the needs of larger loads and higher speeds.

[0050] When low load is not required, one or more drive module motor units can be directly shut down to ensure power matching and energy-saving operation. This same operating mode also applies to power generation mode; when higher power generation is needed, the motor unit modules are sequentially shut down and switched to power generation units to meet high-power supply demands. Figure 4 As shown.

[0051] Furthermore, combining Figure 6 As shown, when a faulty single-phase motor module is present, the faulty single-phase motor module is disconnected, and an unused single-phase motor module is controlled to replace the faulty single-phase motor module and continue to operate.

[0052] In the event of a fault, the single-phase motor module can be switched at will to generate electricity or enter the motoring state.

[0053] After a motor system malfunctions, the corresponding single-phase motor module can be switched at will according to the working status, and the idle single-phase motor module can be converted into the required motor or generator as needed, so as to achieve rapid fault tolerance.

[0054] When a single-phase motor unit fails, whether in motoring or generating mode, the faulty unit module can be directly disconnected to ensure the safety and reliability of the motor system.

[0055] Simultaneously, based on the power requirements proposed by the host computer and the actual detected motor power, the required drive energy is reconstructed. When the motor power is insufficient, the required power is reconstructed, such as... Figure 5 and Figure 6 As shown.

[0056] In this embodiment, the H-bridge inverter implements the inverter drive for the single-phase motor module based on the bipolar PWM drive method.

[0057] As an example, the DC / DC converter is a buck-boost converter.

[0058] In this embodiment, the electric motor state and the generator state of each single-phase motor module can be switched arbitrarily.

[0059] As an example, whether it is a motor or a generator, the power devices used in DC / DC converters and H-bridge inverters are IGBTs, MOSFETs, SiC, or GaN.

[0060] The motor system described in this embodiment uses an inverter drive method similar to that of a traditional permanent magnet DC motor in the motoring state; while the rectification method in the generator state is similar to the buck-boost method, and energy storage can be directly achieved using an energy storage inductor.

[0061] In summary, this invention achieves seamless transition from electric to generator mode during power drive, improving the stability and response speed of the starter generator. Simultaneously, it utilizes controllable rectification technology to enable both electric drive (inverter) and generator (rectifier) ​​functions using the same power unit, ensuring modularity of the power unit. Finally, through arbitrary control and switching between different modules, it achieves arbitrary combinations of power output, making power adjustment more convenient and faster, and more fault-tolerant, thereby ensuring the safety and reliability of the system.

[0062] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A single-phase modular motor system, characterized in that... It includes n single-phase motor units, which constitute a multi-module motor structure; each single-phase motor unit includes a DC power supply, a DC / DC converter, an H-bridge inverter, and a single-phase motor module; each single-phase motor module is configured with a single-phase winding; n single-phase motor modules adopt a multi-stator winding, common rotor structure; In motor mode, the DC / DC converter is turned on and becomes a conductor, and the DC power supply drives the single-phase motor module through the H-bridge inverter. In the power generation state, the H-bridge inverter enters the uncontrolled rectification state. The electrical energy output by the single-phase motor module is rectified by the H-bridge inverter and then converted by the DC / DC converter before being output. In the motor system startup state, p single-phase motor modules that need to be started are selected according to the input power requirements, so that the selected p single-phase motor modules enter the motor working state, and the other np single-phase motor modules are selected as single-phase motor modules for power generation state. Once the rotor reaches the set speed, the number q of single-phase motor modules that need to be put into power generation mode is determined according to the current output power demand. If q is less than or equal to np, then q single-phase motor modules are selected from the candidate single-phase motor modules for power generation mode to be put into power generation mode; otherwise, all candidate single-phase motor modules for power generation mode are selected to be put into power generation mode, and at the same time, some or all of the p single-phase motor modules are selected to be put into power generation mode. Once the rotor reaches the set speed, if q is less than or equal to np, the torque of the p single-phase motor modules will gradually decrease until they are completely de-motorized. If q is greater than np, then some or all of the p single-phase motor modules will be switched from the motoring state to the generating state. During the operation of the motor system, the single-phase motor module is controlled to switch from motoring to generating or from generating to motoring according to the increase or decrease of output power requirements. When a faulty single-phase motor module is detected, the faulty single-phase motor module is disconnected, and an unused single-phase motor module is controlled to replace the faulty single-phase motor module and continue operation.

2. The single-phase modular motor system according to claim 1, characterized in that, The H-bridge inverter uses a bipolar PWM drive method to drive the single-phase motor module.

3. The single-phase modular motor system according to claim 1, characterized in that, The DC / DC converter is a buck-boost converter.

4. The single-phase modular motor system according to claim 1, characterized in that, The power devices used in DC / DC converters and H-bridge inverters are IGBTs, MOSFETs, SiC, or GaN.

5. The single-phase modular motor system according to claim 1, characterized in that, In power generation mode, energy is stored using an energy storage inductor.

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