Electric and power generation integrated motor

Abstract

The invention discloses an electric and power generation integrated motor which comprises a permanent magnet motor body, a frequency converter module, an energy feedback module and a central control module. The permanent magnet motor body is mechanically connected with the driving system and is used for realizing mutual conversion between electric energy and mechanical energy; the frequency converter module is electrically connected with the permanent magnet motor body and is used for adjusting the working frequency and torque of the motor and controlling the motor to operate in an electric or power generation state; and the energy feedback module is connected with the frequency converter module and the power grid and is used for feeding redundant electric energy back to the power grid in a power generation state. When the device is implemented, electric and power generation bidirectional control is realized through the frequency converter module and the energy feedback module. When the energy of the driving system is excessive, the motor operates as the generator, and the energy corresponding to the driving system is fed back to the power grid; when the energy of the driving system is insufficient, the motor operates as a motor, and electric energy is converted into mechanical energy through a power grid.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically a motor that integrates electric drive and power generation. Background Technology

[0002] In energy-intensive fields such as energy storage power stations, large-scale water conveyance projects, and mining transportation, drive systems often face complex operating conditions. For example, when equipment is descending a slope or heavy objects are being lowered, excess mechanical energy can occur, causing the motor to enter generator mode. Currently, mainstream technical solutions have significant shortcomings: one approach uses separate motors and generators, resulting in a complex and inefficient system; the other uses ordinary frequency converters to drive the motor, but when the motor generates electricity, the regenerative energy produced can only be consumed as heat through braking resistors, causing serious energy waste and posing heat dissipation and safety hazards.

[0003] Although some frequency converters with feedback function can feed energy back to the grid, their control strategies are simple and their dynamic response is slow. They are difficult to achieve fast and smooth switching between modes when the load fluctuates drastically, which can easily cause shocks to the grid. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides an integrated electric motor that can generate electricity, effectively solving the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated electric motor that combines power generation and electric drive, comprising a permanent magnet motor body, a frequency converter module, an energy feedback module, and a central control module;

[0006] The permanent magnet motor body is mechanically connected to the drive system to realize the mutual conversion of electrical energy and mechanical energy;

[0007] The frequency converter module is electrically connected to the permanent magnet motor body and is used to adjust the motor's operating frequency and torque, controlling its operation in motoring or generating mode.

[0008] The energy feedback module is connected to the frequency converter module and the power grid, and is used to feed excess electrical energy back to the power grid when generating electricity;

[0009] The central control module is connected to the frequency converter module and the energy feedback module to monitor the energy status of the drive system and switch the motor operating mode.

[0010] Preferably, the frequency converter module includes a rectifier unit, an inverter unit, and a DC bus capacitor;

[0011] The rectifier unit is a controllable rectifier circuit used to convert AC power from the grid into DC power in the motor state.

[0012] The inverter unit is a fully controlled inverter circuit, used to convert DC power into variable frequency AC power to drive the motor, or to rectify the AC power output by the motor into DC power in the power generation state.

[0013] The DC bus capacitor is used to stabilize the DC bus voltage and suppress power fluctuations.

[0014] Preferably, the energy feedback module includes a grid-connected inverter and a filter circuit;

[0015] The grid-connected inverter is a full-bridge inverter topology used to convert DC bus power into AC power that is in phase and frequency with the power grid.

[0016] The filtering circuit uses an LC low-pass filter to suppress high-frequency harmonics and ensure that the fed-back power meets the grid quality standards.

[0017] Preferably, the central control module includes an energy detection unit and a mode switching unit;

[0018] The energy detection unit collects the power, speed and torque parameters of the drive system in real time to determine whether there is excess or insufficient energy.

[0019] The mode switching unit outputs a control signal based on the detection result, causing the motor to switch to either generator mode or electric mode.

[0020] Preferably, in generator mode, the mode switching unit controls the inverter module to adjust the direction of motor torque so that the motor operates as a generator, and at the same time starts the energy feedback module to transmit power to the grid; in electric mode, it controls the inverter module to output drive torque so that the motor absorbs electrical energy from the grid.

[0021] Preferably, it also includes an energy storage buffer module, which is connected to the DC bus and is used to absorb or release instantaneous power during energy fluctuations to maintain system voltage stability; the energy storage buffer module consists of a supercapacitor bank and a bidirectional DC-DC converter.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] When this device is implemented, bidirectional control of motoring and power generation is achieved through a frequency converter module and an energy feedback module. When the drive system has excess energy, the motor operates as a generator, feeding the corresponding energy from the drive system back to the power grid; when the drive system has insufficient energy, the motor operates as a motor, converting electrical energy into mechanical energy through the power grid. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] In the diagram: 1. Permanent magnet motor body; 2. Inverter module; 3. Energy feedback module; 4. Central control module; 5. Energy storage buffer module;

[0027] 21. Rectifier unit; 22. Inverter unit; 23. DC bus capacitor;

[0028] 31. Grid-connected inverter; 32. Filter circuit;

[0029] 41. Energy detection unit; 42. Mode switching unit. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Depend on Figure 1 The present invention discloses an integrated electric motor that combines power generation and electric drive, comprising a permanent magnet motor body 1, a frequency converter module 2, an energy feedback module 3, and a central control module 4;

[0032] The permanent magnet motor body 1 is mechanically connected to the drive system to realize the mutual conversion of electrical energy and mechanical energy;

[0033] The frequency converter module 2 is electrically connected to the permanent magnet motor body 1 and is used to adjust the operating frequency and torque of the motor to control its operation in motoring or generating mode.

[0034] The energy feedback module 3 is connected to the frequency converter module 2 and the power grid, and is used to feed excess electrical energy back to the power grid when generating electricity;

[0035] The central control module 4 is connected to the frequency converter module 2 and the energy feedback module 3 by signal, and is used to monitor the energy status of the drive system and switch the motor operating mode.

[0036] The permanent magnet motor body 1 is a permanent magnet synchronous motor. Its rotor uses high coercivity rare earth permanent magnet material, and the stator winding has a multi-phase distributed structure, which has the characteristics of low loss and high power density.

[0037] The inverter module 2 includes a rectifier unit 21, an inverter unit 22, and a DC bus capacitor 23.

[0038] The rectifier unit 21 is a controllable rectifier circuit used to convert AC power from the grid into DC power in the motor state.

[0039] The inverter unit 22 is a fully controlled inverter circuit, used to convert DC power into variable frequency AC power to drive the motor, or to rectify the AC power output by the motor into DC power in the power generation state.

[0040] The DC bus capacitor 23 is used to stabilize the DC bus voltage and suppress power fluctuations.

[0041] The energy feedback module 3 includes a grid-connected inverter 31 and a filter circuit 32;

[0042] The grid-connected inverter 31 is a full-bridge inverter topology, used to convert DC bus power into AC power with the same frequency and phase as the power grid.

[0043] The filter circuit 32 uses an LC low-pass filter to suppress high-frequency harmonics and ensure that the feedback power meets the grid quality standards.

[0044] The central control module 4 includes an energy detection unit 41 and a mode switching unit 42;

[0045] The energy detection unit 41 collects the power, speed and torque parameters of the drive system in real time to determine whether there is excess or insufficient energy.

[0046] The mode switching unit 42 outputs a control signal based on the detection result, causing the motor to switch to either generator mode or electric mode.

[0047] In generator mode, the mode switching unit 42 controls the inverter module 2 to adjust the direction of the motor torque so that the motor can run as a generator, and at the same time starts the energy feedback module 3 to transmit power to the grid; in electric mode, it controls the inverter module 2 to output the drive torque so that the motor can absorb electrical energy from the grid.

[0048] It also includes an energy storage buffer module 5, which is connected to the DC bus and is used to absorb or release instantaneous power during energy fluctuations to maintain system voltage stability; the energy storage buffer module 5 consists of a supercapacitor bank and a bidirectional DC-DC converter.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric motor / generator integrated motor, characterized by: It comprises a permanent magnet motor body (1), a frequency converter module (2), an energy feedback module (3) and a central control module (4); The permanent magnet motor body (1) is mechanically connected with the driving system, for realizing mutual conversion between electric energy and mechanical energy; The frequency converter module (2) is electrically connected with the permanent magnet motor body (1), for adjusting the working frequency and torque of the motor and controlling it to run in the electric or power generation state; The energy feedback module (3) is connected with the frequency converter module (2) and the power grid, for feeding back the excess electric energy to the power grid in the power generation state; The central control module (4) is signal connected with the frequency converter module (2) and the energy feedback module (3), for monitoring the energy state of the driving system and switching the motor running mode.

2. The electric motor / generator integrated motor of claim 1, wherein: The frequency converter module (2) comprises a rectifier unit (21), an inverter unit (22) and a DC bus capacitor (23); The rectifier unit (21) is a controllable rectifier circuit, for converting the AC power grid into DC power in the electric state; The inverter unit (22) is a full-controlled inverter circuit, for converting the DC power into variable frequency AC power to drive the motor, or rectifying the AC power output by the motor into DC power in the power generation state; The DC bus capacitor (23) is used for stabilizing the DC bus voltage and suppressing power fluctuation.

3. The electric motor / generator integrated motor of claim 1, wherein: The energy feedback module (3) comprises a grid-connected inverter (31) and a filter circuit (32); The grid-connected inverter (31) is a full-bridge inverter topology, for converting the DC bus electric energy into AC power with the same frequency and phase as the power grid; The filter circuit (32) adopts an LC low-pass filter, for suppressing high-frequency harmonics.

4. The electric motor / generator integrated motor of claim 1, wherein: The central control module (4) comprises an energy detection unit (41) and a mode switching unit (42); The energy detection unit (41) collects the power, speed and torque parameters of the driving system in real time, judges the energy surplus or deficiency state; The mode switching unit (42) outputs a control signal according to the detection result, so that the motor is switched to the power generation mode or the electric mode.

5. The electric motor / generator integrated electric machine according to claim 4, characterized by: The mode switching unit (42) controls the frequency converter module (2) to adjust the torque direction of the motor in the power generation mode, so that the motor runs as a generator, and simultaneously starts the energy feedback module (3) to transmit power to the power grid; in the electric mode, the frequency converter module (2) outputs the driving torque, so that the motor absorbs electric energy from the power grid.

6. The electric motor / generator integrated electric machine according to claim 1, characterized by: It also comprises an energy storage buffer module (5) connected to the DC bus, for absorbing or releasing transient power when the energy is suddenly changed, so as to keep the system voltage stable; the energy storage buffer module (5) is composed of a super capacitor group and a bidirectional DC-DC converter.

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