Electrical control system for speed regulation actuator of integrated direct-current brush and brushless motor

Abstract

The utility model relates to an integrated DC brush and brushless motor speed regulation actuator electrical control system, which is formed by integrating control circuits of a DC brush motor and a DC brushless motor in an electrical control system and then adding a main control chip. The integrated direct current brush and brushless motor control system receives a speed regulation control instruction through a CAN-BUS communication bus; the integrated direct-current brush and brushless motor control system drives a control instruction to a direct-current brush motor or a direct-current brushless motor, and the direct-current brush motor or the direct-current brushless motor provides power for the speed regulation actuator mechanism. The electric actuator is adopted, closed-loop control can be carried out on an actuator motor, information communication and interaction are carried out on control and monitoring information and a post-stage main control electric control system, a CAN communication mode is supported, and efficient synchronization is achieved; and simultaneous networking control of a plurality of electric actuator circuit systems is supported, and cooperative work is realized.

Description

Technical Field

[0001] The utility model relates to a speed regulator technology for a generator set, in particular to an integrated DC brushed and brushless motor speed regulating actuator electrical control system. Background Art

[0002] The technical development of speed governors has gone through five stages: mechanical speed governor, hydraulic speed governor, electro-hydraulic speed governor, electro-hydraulic composite speed governor, and fully electronic speed governor. Due to the special requirements of nuclear power units for reliability, most of them currently use electro-hydraulic composite speed governors, mainly WoodWard's EGB35P, PGA (G) -EG and Heinzmann's 2231 series digital speed governor with ball head backup. At present, there is no mature electro-hydraulic composite speed governor product in China. Hydraulic actuators, due to their extremely complex materials, working principles, and control methods, require a long time from research and development to product development. The installation space and development time of speed actuators on diesel engines are greatly limited.

[0003] The conventional driving method of brushless DC motors is to use three half-bridge drivers. Although the circuit designed in this way is simple and direct, it has obvious disadvantages. During debugging or complex industrial control, it may cause the upper and lower arms of the half-bridge to be directly turned on, posing a risk of control failure.

[0004] Brushed DC motors have advantages such as simple control and convenient adjustment. Their driving methods, H-bridge circuits and PWM output control technology, are very mature motor driving methods. However, the gated driving of the H-bridge may cause the upper and lower arms of the half-bridge to be directly turned on, resulting in safety hazards in the control circuit.

[0005] This drive part is mainly focused on the motor drive circuit solution in the integrated DC brushed and brushless motor control system. Regardless of the motor drive circuit of the brushless motor or the DC motor, the bridge circuit is adopted. The disadvantage of the bridge circuit is that the upper and lower bridges are turned on at the same time. Utility Model Content

[0006] Aiming at the above problems, an integrated DC brushed and brushless motor speed regulating actuator electrical control system is proposed.

[0007] The technical solution of the utility model is: an integrated DC brush and brushless motor speed control actuator electrical control system, comprising a speed control system, an integrated DC brush and brushless motor control system and a speed control actuator mechanism; the integrated DC brush and brushless motor control system is composed of a DC brush motor and a DC brushless motor control circuit integrated in an electric control system and then adding a main control chip, the integrated DC brush and brushless motor control system receives a speed control instruction through a CAN-BUS communication bus; the integrated DC brush and brushless motor control system drives the control instruction to the DC brush motor or the DC brushless motor, and the DC brush motor or the DC brushless motor provides power to the speed control actuator mechanism.

[0008] Preferably, the integrated DC brush and brushless motor control system collects current, voltage, position and speed signals of the running DC brush motor or DC brushless motor, and the running DC brush motor or DC brushless motor transmits power to the speed control actuator mechanism through a gear system; the integrated DC brush and brushless motor control system monitors the position and speed of the speed control actuator mechanism, and the integrated DC brush and brushless motor control system processes the signal and then optimizes the control signal to drive the DC brushless motor or DC brush motor.

[0009] Preferably, the main control chip in the integrated DC brushed and brushless motor control system outputs control signals and instruction sets to the 3-phase gated drive chip circuit, the 3-phase gated drive chip circuit outputs drive signals to the DC brushless motor, and a logic locking circuit is added before the control signal, and the upper bridge arm and the lower bridge arm of the logic locked half-bridge are turned on at the same time.

[0010] Preferably, in the integrated DC brushed and brushless motor control system, the main control chip outputs a control signal to the gated drive chip circuit, the gated drive chip circuit outputs a drive signal to the DC brushless motor, the control signal has a logic locking circuit, the upper and lower bridge arms of the logic locking are turned on at the same time, and an optocoupler isolation circuit is added between the control signal output by the main control chip and the drive.

[0011] Preferably, the brushless DC motor and the brushed DC motor are redundantly designed, wherein the brushless DC motor is a type of actuator motor of the speed regulating actuator mechanism, and the brushed DC motor is selected as a type of actuator motor of the speed regulating actuator mechanism.

[0012] The beneficial effects of the utility model are as follows: the utility model integrated DC brush and brushless motor speed regulating actuator electrical control system adopts electric actuators, can perform closed-loop control of the actuator motor, and communicate and interact the control and monitoring information with the subsequent main control electronic control system, supports CAN communication mode, and has efficient synchronization; supports simultaneous networking control of multiple electric actuator circuit systems to achieve collaborative work. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the electrical control system structure of the utility model integrated DC brush and brushless motor speed regulating actuator;

[0014] Figure 2 This is a schematic diagram of the structure of the integrated DC brushless and brushless motor control system in the utility model system;

[0015] Figure 3 This is a logic lock circuit diagram in the system of the utility model. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0017] Due to the limited installation space and development time of the speed control actuator on the diesel engine, a newly developed electric actuator is used to replace the electro-hydraulic actuator. The electric execution control methods include servo torque motor plus turbine rod, servo torque motor plus reduction gear and limited angle DC torque motor direct drive solution.

[0018] In order to ensure that the failure does not affect the operation of the entire system, the actuator adopts a redundant design. Here, the conventional design of using two identical DC motors as one main and one backup is changed to a design scheme of using a DC brushless motor as the main and a DC brush motor as the backup. The DC brushless motor has small size, high power, long service life and excellent performance, but its control algorithm is relatively complex. Selecting a DC brushless motor as a type of actuator motor of the speed control actuator mechanism can make the speed control actuator mechanism meet the use function. The DC brush motor has direct drive, simple control and rapid response, so it is selected as the second type of actuator motor. In order to prevent problems with the first type of motor, the system can immediately switch to the second type of motor to continue working, and at the same time feedback to the speed control system. When maintenance is allowed, the speed control actuator mechanism is replaced. Prevent the failure of the speed control actuator mechanism during use. The advantage is that it not only uses the advantages of the DC brushless motor when it is running normally, but also the advantages of the DC brush motor that responds quickly in the fault state.

[0019] like Figure 1The schematic diagram of the structure of the electrical control system of the integrated DC brush and brushless motor speed control actuator shown in the figure includes a speed control system, an integrated DC brush and brushless motor control system and a speed control actuator mechanism; the integrated DC brush and brushless motor control system is composed of the control circuits of the DC brush motor and the DC brushless motor integrated into an electronic control system and then adding a main control chip, and the integrated DC brush and brushless motor control system receives speed control instructions through the CAN-BUS communication bus; the integrated DC brush and brushless motor control system drives the control instructions to the DC brush motor or the DC brushless motor, and the DC brush motor or the DC brushless motor provides power to the speed control actuator mechanism.

[0020] like Figure 2 The integrated brushless DC motor control system structure diagram is shown in the figure. The integrated brushless DC motor control system directly collects the current, voltage, position, and speed signals of the running brushless DC motor or brushless DC motor. The current and voltage can calculate the real-time power. Under normal operating conditions, the power is basically constant. The motor runs and transmits the power to the speed control actuator mechanism through the gear system. The integrated brushless DC motor control system monitors the position and speed of the speed control actuator mechanism, processes the signal, and then optimizes the control signal to drive the brushless DC motor or brushless DC motor.

[0021] The drive mode of the brushless DC motor adopts the existing 3-phase gated driver chip circuit of the brushless DC motor. The main control chip outputs the control signal (3×PWM) and the instruction set to the 3-phase gated driver chip circuit, and the 3-phase gated driver chip circuit outputs the drive signal to the brushless DC motor, so that the brushless DC motor can achieve various driving mode working effects. In addition, a logic locking circuit is added before the control signal, and the upper and lower bridge arms of the logic locking half bridge are turned on at the same time, making the control safer and more reliable. The main control chip adopts the FOC (field oriented control) algorithm.

[0022] The brushed DC motor uses the existing brushed DC motor gate driver chip circuit. The main control chip outputs the control signal (2×PWM) to the gate driver chip circuit, and the gate driver chip circuit outputs the drive signal to the brushless DC motor, so that the brushless DC motor can work normally. A logic locking circuit is added before the control signal, and the upper and lower bridge arms of the logic locking are turned on at the same time. In addition, an optocoupler isolation circuit is added between the output control signal of the main control chip and the drive. It effectively isolates the high-power circuit and the control circuit, ensuring the safety of the control circuit.

[0023] The advantage of integration is that electric actuators generally adopt a more rigorous safety design, after all, they control the throttle output. It is very important and critical. Therefore, hardware redundancy design is usually adopted. In short, an electric actuator has an execution motor and a redundant motor, which are motors of the same or different types. When a motor fails during the execution process, the motor monitoring circuit will always collect and monitor the operating status of the motor. If an abnormal situation occurs, the integrated DC brushless and brushless motor control system will drive and confirm multiple times. If the system determines that the motor fails, it will immediately switch to drive the redundant backup motor, so that the speed control actuator mechanism will not fail immediately. At the same time, the speed control system is reported, and the drive motor of the speed control actuator mechanism fails, which can be replaced during maintenance.

[0024] like Figure 3 The logic lock circuit diagram shown in the figure takes a DC brushed motor as an example. The main control chip controls the bridge circuit with two signals, H-side and L-side. The H-side signal is divided into two paths, one output controls the switch of the upper half bridge arm, and the other outputs to the inverter circuit. The L-side signal is output to the AND gate circuit. The L-side signal and the H-side signal are processed by the inverter, and these two signals are output to the AND gate circuit together. Finally, the Output signal output by the AND gate circuit controls the switch of the lower half bridge arm.

[0025] As shown in the truth table: Analyzing the H-side signal and the Output signal, it is found that these two signals will not be 1 at the same time. Similarly, the upper and lower bridge arms will not be turned on at the same time due to the logic of the control signal (H-side and L-side), causing the circuit to fail.

[0026] Table 1

[0027] H-side L-side Output 1 1 0 1 0 0 0 1 1 0 0 0

[0028] The hardware logic circuit is used to prevent the upper and lower bridges from being turned on at the same time, rather than the program of the main controller. The protection level of the hardware circuit is higher than that of the program protection.

[0029] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An integrated DC brushed and brushless motor speed control actuator electrical control system, characterized in that: It includes a speed control system, an integrated DC brush and brushless motor control system and a speed control actuator mechanism; the integrated DC brush and brushless motor control system is composed of the control circuits of the DC brush motor and the DC brushless motor integrated into an electronic control system and then adding a main control chip, and the integrated DC brush and brushless motor control system receives speed control instructions through the CAN-BUS communication bus; the integrated DC brush and brushless motor control system drives the control instructions to the DC brush motor or the DC brushless motor, and the DC brush motor or the DC brushless motor provides power to the speed control actuator mechanism.

2. The integrated DC brushed and brushless motor speed regulating actuator electrical control system according to claim 1, characterized in that: The integrated DC brush and brushless motor control system collects signals of current, voltage, position, and speed of the running DC brush motor or DC brushless motor, and the running DC brush motor or DC brushless motor transmits power to the speed control actuator mechanism through a gear system; the integrated DC brush and brushless motor control system monitors the position and speed of the speed control actuator mechanism, and the integrated DC brush and brushless motor control system processes the signal and then optimizes the control signal to drive the DC brushless motor or DC brush motor.

3. The integrated DC brushed and brushless motor speed regulating actuator electrical control system according to claim 2, characterized in that: In the integrated DC brushed and brushless motor control system, the main control chip outputs control signals and instruction sets to the 3-phase gated drive chip circuit, and the 3-phase gated drive chip circuit outputs drive signals to the DC brushless motor. A logic locking circuit is added before the control signal, and the upper bridge arm and the lower bridge arm of the logic locked half bridge are turned on at the same time.

4. The integrated DC brushed and brushless motor speed regulating actuator electrical control system according to claim 2, characterized in that: In the integrated DC brushed and brushless motor control system, the main control chip outputs a control signal to a gated drive chip circuit, and the gated drive chip circuit outputs a drive signal to the brushless DC motor. The control signal has a logic locking circuit, and the upper and lower bridge arms of the logic locking are turned on at the same time, and an optocoupler isolation circuit is added between the control signal output by the main control chip and the drive.

5. The integrated DC brush and brushless motor speed control actuator electrical control system according to any one of claims 1 to 4, characterized in that: The brushless DC motor and the brushed DC motor are redundantly designed, wherein the brushless DC motor is a type of actuator motor of the speed regulating actuator mechanism, and the brushed DC motor is selected as a type of actuator motor of the speed regulating actuator mechanism.

Images