阅读说明：本技术 低速大转矩永磁电机用智能型低频驱动控制器 (Intelligent low-frequency driving controller for low-speed large-torque permanent magnet motor ) 是由 赵勇 陈虎威 钱伟 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种低速大转矩永磁电机用智能型低频驱动控制器,整流单元与逆变单元之间连接电容组件,主控系统与电容组件之间连接电压霍尔,整流单元与输入接触器连接,输入接触器与输入电抗器连接,输入电抗器连接电源输入,逆变单元和主控系统均连接有输出电抗器,输出电抗器并联到电流霍尔,电流霍尔连接输出接触器,主控系统上分两路连接开关电源和安全栅,开关电源上串联连接控制开关、控制变压器和熔断器,熔断器的另一端连接在输入电抗器的输入端,安全栅另一端连接危险区。能够良好的解决电机系统中出现的技术瓶颈问题,对电机行业的发展起到良好的推动作用。(The invention discloses an intelligent low-frequency drive controller for a low-speed large-torque permanent magnet motor, wherein a capacitor assembly is connected between a rectifying unit and an inverting unit, a voltage Hall is connected between a main control system and the capacitor assembly, the rectifying unit is connected with an input contactor, the input contactor is connected with an input reactor, the input reactor is connected with a power supply input, the inverting unit and the main control system are both connected with an output reactor, the output reactor is connected to the current Hall in parallel, the current Hall is connected with an output contactor, the main control system is divided into two paths to be connected with a switching power supply and a safety grid, the switching power supply is connected with a control switch, a control transformer and a fuse in series, the other end of the fuse is connected to the input end. The problem of technical bottleneck appearing in the motor system can be solved well, and the development of the motor industry is promoted well.)

1. The utility model provides an intelligent low frequency drive controller for low-speed big torque permanent-magnet machine which characterized by: the power supply comprises a main control system (9), an inversion unit (8) and a rectification unit (6), wherein a capacitor assembly (7) is connected between the rectification unit (6) and the inversion unit (8), a voltage Hall (10) is connected between the main control system (9) and the capacitor assembly (7), the rectification unit (6) is connected with an input contactor (3), the input contactor (3) is connected with an input reactor (2), the input reactor (2) is connected with power input, the output ends of the inversion unit (8) and the main control system (9) are respectively connected with an output reactor (11), the two output reactors (11) are connected to a current Hall (12) in parallel, the current Hall (12) is connected with an output contactor (13), the output contactor (13) is connected with power output, the main control system (9) is divided into two paths to be connected with a switching power supply (16) and a safety grid (15), and the switching power supply (16) is connected with a control switch (17, The control transformer (18) and the fuse (19), the other end of the fuse (19) is connected to the input end of the input reactor (2), the other end of the safety barrier (15) is connected with the danger area (14), and the safety barrier (15) transmits electric signals in the safety area and the danger area in a two-way mode.

2. The intelligent low-frequency drive controller for the low-speed high-torque permanent magnet motor according to claim 1, wherein: the input contactor (3) is connected with the charging contactor (5) in parallel.

3. The intelligent low-frequency drive controller for the low-speed high-torque permanent magnet motor according to claim 2, wherein: and the charging contact (5) is connected with the charging resistor (4) in series to limit the charging current.

4. The intelligent low-frequency drive controller for the low-speed high-torque permanent magnet motor according to claim 1, wherein: an RFI filter (1) is connected between the input reactor (2) and the power input and is used for cutting off the path of electromagnetic interference.

5. The intelligent low-frequency drive controller for the low-speed high-torque permanent magnet motor according to claim 1, wherein: the power input is connected with 1140 VAC.

Technical Field

The invention relates to the technical field of controllers, in particular to an intelligent low-frequency drive controller for a low-speed and high-torque permanent magnet motor.

Background

In view of the current problem of resource supply, a direct-drive motor system with high efficiency, high power factor and low cost is developed for a power drive system in the chemical industry, the steel industry and the mineral exploration industry. The variable frequency driving system is used as an indispensable component of the motor equipment, and the output power quality is related to the output performance of the whole motor system; meanwhile, the running state of the motor is closely inseparable from the working characteristics of the frequency converter.

In the steel making process, equipment such as a combustion fan, a dust removal fan, a water pump and the like are included, and the equipment is used as general machinery of a steel mill, so that a large amount of resource loss is generated. Under the constraints of processing technology and quality of manufactured products, parts of equipment such as a fan, a converter, a dephosphorizing furnace and the like have high requirements on the speed regulation range of a driving motor. This presents a significant challenge to variable frequency drive systems.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the intelligent low-frequency drive controller for the novel low-speed large-torque permanent magnet motor is developed, and the requirement of the motor speed regulation range is met.

The technical scheme adopted by the invention for solving the technical problems is as follows: an intelligent low-frequency drive controller for a low-speed large-torque permanent magnet motor comprises a main control system, an inversion unit and a rectification unit, wherein a capacitor assembly is connected between the rectification unit and the inversion unit, a voltage Hall is connected between the main control system and the capacitor assembly, the rectification unit is connected with an input contactor, the input contactor is connected with an input reactor, the input reactor is connected with a power input, output reactors are connected with output ends of the inversion unit and the main control system, the two output reactors are connected to a current Hall in parallel, the current Hall is connected with an output contactor, the output contactor is connected with a power output, the main control system is divided into two paths to be connected with a switching power supply and a safety grid, the switching power supply is connected with a control switch, a control transformer and a fuse in series, the other end of the fuse is connected with the input end of, the safety barrier transmits electrical signals in both directions in the safety zone and the hazard zone.

Further, the input contactor is connected with the charging contactor in parallel.

Furthermore, the charging contact is connected with the charging resistor in series to limit the charging current.

Furthermore, an RFI filter is connected between the input reactor and the power input and used for cutting off a path of electromagnetic interference.

Further, the power input is connected with 1140 VAC.

The intelligent low-frequency driving controller for the low-speed large-torque permanent magnet motor has the beneficial effects that: 1) the efficiency and the power factor are high, and the low-load-rate state still has higher efficiency and power factor; 2) the frequency modulation range is wide, the reaction is fast, and the dynamic performance is excellent; 3) the shape and the size are flexible and various.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a structural component of a controller;

FIG. 2 is a circuit diagram of an intrinsically safe circuit;

FIG. 3 is a circuit diagram of the input and filtering;

FIG. 4 is a circuit diagram of a rectifying unit;

FIG. 5 is a U-phase wiring diagram;

FIG. 6 is a phase V line diagram;

FIG. 7 is a W-phase wiring diagram;

FIG. 8 is a circuit diagram of output and current sensing;

FIG. 9 is a DC power supply circuit diagram;

in the figure: the system comprises an RFI filter, an input reactor, an input contactor, a charging resistor, a charging contactor, a rectifying unit, a capacitor assembly, an inverter unit, a main control system, a voltage Hall, an output reactor, a current Hall, an output contactor, a danger area, a safety grid, a switching power supply, a control switch, a control transformer and a fuse, wherein the RFI filter, the input reactor, the input contactor, the charging resistor, the charging contactor, the rectifying unit, the capacitor assembly, the inverter unit, the current Hall, the main control system, the voltage Hall, the output reactor, the current Hall.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1, the intelligent low-frequency driving controller for a low-speed large-torque permanent magnet motor comprises a main control system 9, an inverter unit 8 and a rectifying unit 6, wherein a capacitor assembly 7 is connected between the rectifying unit 6 and the inverter unit 8, a voltage hall 10 is connected between the main control system 9 and the capacitor assembly 7, the rectifying unit 6 is connected with an input contactor 3, the input contactor 3 is connected with an input reactor 2, the input reactor 2 is connected with a power input, output reactors 11 are connected with output ends of the inverter unit 8 and the main control system 9, the two output reactors 11 are connected in parallel to a current hall 12, the current hall 12 is connected with an output contactor 13, the output contactor 13 is connected with a power output, the main control system 9 is divided into two paths to be connected with a switching power supply 16 and a safety grid 15, the switching power supply 16 is connected with a control switch 17, a control transformer 18 and a, the other end of the safety barrier 15 is connected with the danger area 14, and the safety barrier 15 transmits electric signals in the safety area and the danger area in two directions.

The input contactor 3 is connected with the charging contactor 5 in parallel, and the charging contactor 5 is connected with the charging resistor 4 in series to limit charging current.

An RFI filter 1 is connected between the input reactor 2 and the power input to cut off the path of electromagnetic interference.

The power input is connected to 1140 VAC.

In the process of designing and researching a complete set of motor system, the invention provides a novel intelligent low-frequency drive controller design around a low-speed permanent magnet synchronous motor aiming at a variable-frequency drive system. The direct-drive low-speed permanent magnet synchronous motor is matched with a direct-drive low-speed permanent magnet synchronous motor which is produced by the company and has the model number of BPJ-1120kW/1140V, the technical bottleneck problems (such as low efficiency, complex transmission system and high cost) in a motor system can be well solved, compared with a common frequency converter of the same type, the direct-drive low-speed permanent magnet synchronous motor saves the manufacturing cost by about 10 percent, reduces the motor operation failure rate by about 20 percent, and plays a good promoting role in the development of the motor industry.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.