CN204669261U - A kind of brushless DC motor control system - Google Patents

Abstract

The utility model belongs to the field of motor control, in particular to a control system for a high-power photovoltaic brushless motor. The utility model discloses a brushless DC motor control system, which is used to drive the brushless DC motor through a photovoltaic power source, and is characterized in that it includes a panel controller for users to input parameters and display the operating state of the system, and is used to transmit the photovoltaic power source signal A driver that converts the PWM signal required by the driver of the brushless DC motor, processes the parameters input by the user and controls the CPU that the driver executes. The driver includes an adjustable conversion circuit connected to the execution unit of the CPU. On the conversion circuit A power interface for connecting with a photovoltaic power source and a motor interface for connecting with a brushless DC motor are provided, and the CPU includes a calculation unit connected with a panel controller and an execution unit connected with a driver. The control system can adapt to the characteristics of large changes in the electrical characteristics of the photovoltaic power supply, and can monitor the working status of the photovoltaic power supply and the motor in real time.

Description

A brushless DC motor control system

technical field

The utility model belongs to the field of motor control, in particular to a control system for a high-power photovoltaic brushless motor.

Background technique

Since the characteristics of photovoltaic power supply are quite different from those of commercial power or industrial power, and traditional motor control systems are mostly developed for commercial power or industrial power, traditional motor control systems are not well suited for motors that use photovoltaic power. . In the prior art, a motor control system for the targeted development of a motor using a photovoltaic power source is still relatively rare.

Contents of the invention

The purpose of the utility model is to provide a brushless DC motor control system with convenient use, stable performance, stable and safe operation, aiming at the deficiencies of the prior art.

The utility model adopts the following technical scheme: a brushless DC motor control system is provided, which is used to drive the DC brushless motor through a photovoltaic power source. Power supply and drive the driver of the brushless DC motor, process the parameters input by the user and control the CPU to execute the driver. The CPU includes a computing unit connected to the panel controller and an execution unit connected to the driver. The driver includes an execution unit connected to the CPU. The unit is connected with an adjustable conversion circuit, and the conversion circuit is provided with a power interface for connecting with a photovoltaic power supply and a motor interface for connecting with a brushless DC motor.

As can be seen from the above description of the utility model, compared with the prior art, the desirable beneficial effects of the utility model are:

1. By separately setting the CPU used to control the conversion circuit, the control system can be applied to electric

Photovoltaic power sources with large sexual changes;

2. The function of real-time monitoring of the motor and power supply status is realized through the panel panel controller.

Description of drawings

Fig. 1 is a composition diagram of a brushless DC motor control system of the present invention.

Detailed ways

The utility model will be further described below in conjunction with the embodiment in the accompanying drawings.

The brushless DC motor control system suitable for photovoltaic power supply is shown in Figure 1, including a panel controller, CPU, and a driver. The photovoltaic power supply and the brushless DC motor are connected to the driver.

The panel controller includes an input unit for the user to input system operating parameters and a display for displaying the real-time status of the system. Both the input unit and the display are connected to the CPU.

The CPU includes a monitoring unit, a computing unit and an execution unit, wherein: the monitoring unit is connected to the display of the panel controller, the computing unit of the CPU, and the driver to collect the real-time status of the photovoltaic power supply and the brushless DC motor; the computing unit is connected to the panel controller The monitoring unit and execution unit of the input unit and the CPU are used to process information from the input unit and the monitoring unit, and send the processing results to the execution unit; the execution unit is connected to the computing unit and the driver of the CPU, and is used to transfer the processing results of the computing unit Convert it into an execution signal and send it to the driver. The execution signal includes speed setting and adjustment signal, and alarm signal.

The driver includes a conversion circuit, a power interface and a motor interface connected with the conversion circuit. The conversion circuit is used to convert the electrical signal of the photovoltaic power supply into a PWM signal that can be used by the brushless DC motor. The conversion circuit is provided with a speed terminal and an alarm terminal connected to the execution unit of the CPU. The speed terminal is used to receive the speed given and adjustment signal from the execution unit of the CPU, including the 0-10V terminal connected to the high level and the AGND terminal connected to the low level. The alarm terminal is used to receive the alarm signal from the CPU, including the NC terminal of the normally closed contact, the NO terminal of the normally open contact and the COM terminal of the common contact. The electrical connection between the power supply and the brushless DC motor is closed; when the system fails, the CPU controls the NC-COM terminal to be disconnected, the NO-COM terminal is closed, and the electrical connection between the photovoltaic power supply and the brushless DC motor is disconnected. The power interface is connected to the photovoltaic power supply, including the HV terminal connected to the high level of the power supply, the GND terminal connected to the low level of the power supply, and the PE terminal of the protective ground terminal. The motor interface is a three-phase interface, which is used to connect the brushless DC motor, including U-terminal, V-terminal and W-terminal.

The operation steps of the brushless DC motor control system are as follows:

Step 1. Connect the photovoltaic power supply and the brushless DC motor to the power interface and motor interface of the driver respectively to ensure that the connection is stable and reliable;

Step 2, the user enters various parameters required for system operation in the input unit of the panel controller;

Step 3. The calculation unit of the CPU receives and calculates various parameters input by the user, and sends the calculation results to the execution unit, which compiles the calculation results into a given speed signal and an operation signal, and the operation signal is sent to the alarm of the conversion circuit in the drive. Terminal, the speed given signal is sent to the speed terminal of the conversion circuit in the driver;

Step 4, the conversion circuit receives and executes the operation signal and speed given signal from the CPU, the NC-COM in the alarm terminal is closed, the NO-COM is disconnected, the photovoltaic power supply is electrically connected to the brushless DC motor, and the conversion circuit converts the power from the photovoltaic power supply to The signal is converted into the PWM signal required by the brushless DC motor, and drives the brushless DC motor to run at the set speed;

Step 5, the power supply status sensor and motor status sensor set on the power interface of the driver and the motor interface collect information such as the voltage and current of the photovoltaic power supply, the speed and temperature of the brushless DC motor, and feed it back to the monitoring unit of the CPU and control it on the panel displayed on the display of the device;

Step 6: The CPU monitoring unit receives the information from the power supply status sensor and the motor status sensor, and sends it to the calculation unit. The calculation unit calculates the information from the monitoring unit, and sends the calculation result to the execution unit. The execution unit compiles the calculation result into a speed adjustment signal or The shutdown signal, the speed adjustment signal is sent to the speed terminal on the conversion circuit of the driver, and the shutdown signal is sent to the alarm terminal on the conversion circuit of the driver;

Step 7: If the drive receives the speed adjustment signal from the CPU, adjust the speed of the motor according to the speed adjustment signal. If the drive receives the shutdown signal from the CPU, the NC-COM in the alarm terminal is disconnected and the NO-COM is closed. The electrical connection between the photovoltaic power source and the brushless DC motor is disconnected, and the motor stops running.

The above is only a specific embodiment of the utility model, but the concept of the utility model is not limited thereto, any non-substantial modification of the utility model by using this concept should be an act of violating the protection scope of the utility model .

Claims (8)

1. a brushless DC motor control system, for driving brshless DC motor by photo-voltaic power supply, it is characterized in that: comprise for user's input parameter and the panel controller of display system running status, for photo-voltaic power supply signal is converted to brshless DC motor driver needed for the driver of pwm signal, process the parameter of user's input and the CPU of control and drive system execution, described CPU comprises the computing unit and the performance element being connected driver that connect panel controller, described driver comprises the adjustable change-over circuit be connected with the performance element of CPU, this change-over circuit is provided with the power interface for being connected with photo-voltaic power supply and the motor interface for being connected with brshless DC motor.

2. a kind of brushless DC motor control system according to claim 1, is characterized in that: the power interface on described driver comprise connect high level HV end, connect low level GND hold and protective earthing terminal PE hold.

3. a kind of brushless DC motor control system according to claim 1, is characterized in that: the motor interface on described driver is three interfaces comprising U end, V end and W end.

4. a kind of brushless DC motor control system according to claim 1, is characterized in that: described driver is also provided with and regulates and given rotating speed terminal for motor speed.

5. a kind of brushless DC motor control system according to claim 1, it is characterized in that: described driver is also provided with the alarm terminal be connected with the performance element of CPU, described alarm terminal comprises normally-closed contact NC end, normally opened contact NO holds and common COM end, during system worked well, CPU control NC holds hold with COM closed, NO hold and hold with COM and disconnects, during the system failure CPU control NC end and COM hold disconnect, NO holds and COM holds and closes.

6. a kind of brushless DC motor control system according to claim 1, it is characterized in that: described CPU also comprises monitoring unit, the power interface of described driver with motor interface is respectively equipped with the power supply status transducer and motor state sensor that are connected with the monitoring unit of CPU.

7. a kind of brushless DC motor control system according to claim 6, it is characterized in that: described power supply status transducer comprises supply voltage transducer and source current transducer, and described motor state sensor comprises speed probe and temperature sensor.

8. a kind of brushless DC motor control system according to claim 1, is characterized in that: described panel controller comprise be connected with the computing unit of CPU, for user input parameter input unit and be connected with the monitoring unit of CPU, for the display of real-time display power supply and motor status.