CN103001560A

CN103001560A - Control method for brushless direct current motor (BLDC)

Info

Publication number: CN103001560A
Application number: CN2012104672719A
Authority: CN
Inventors: 李翠; 王春艳
Original assignee: Shenyang Hongda Information Technology Co Ltd
Current assignee: Shenyang Hongda Information Technology Co Ltd
Priority date: 2012-11-19
Filing date: 2012-11-19
Publication date: 2013-03-27

Abstract

The invention provides a control method for a BLDC and belongs to the technical field of motor control. The method includes controlling a main program of a system and initializing the program, wherein the main program control of the system mainly includes variable declaration, system initialization and interrupt vector table setting; and the program initialization includes the initialization for all parts of the whole digital signal processor (DSP). The control method has the advantages that the control system adopts a latest control chip special for the BLDC as a core to achieve the control for the motor motion, the timeliness is good, the control accuracy and the system reliability are high, and the like.

Description

Control method for brushless direct current motor

Technical field

The invention belongs to the electric machines control technology field, particularly a kind of control method for brushless direct current motor.

Background technology

20 beginnings of the century, it is ripe that the development of DC motor has been tending towards.Traditional direct current machine has good torque characteristics and speed adjusting performance, therefore is widely used in kinematic system.The development of novel power transistor, microprocessor technology, New Control Theory, and the appearance of the permanent magnetic material of low-cost, high energy product, solid foundation has been established in the extensive use that is brshless DC motor.At present, the brushless DC motor control system real-time is poor, control precision is low, so the development of new electric machine control system is the focus of current research.

Summary of the invention

Deficiency for prior art exists the invention provides a kind of control method for brushless direct current motor.

Technical scheme of the present invention is achieved in that by main control module, power driver module and brshless DC motor and forms that main control module is connected with power driver module, and power driver module is connected with brshless DC motor.Main control module by control chip, crystal oscillator reseting module, power module, external expansion module form, crystal oscillator power interface, the reset clock interface of reseting module, power module, external expansion module and main control chip be connected with external expansion interface; Power driver module is comprised of phase current testing circuit, rotor position detection circuit, optical coupling isolation circuit, Drive Protecting Circuit and driving inverter circuit; the phase current testing circuit, transfer position detecting circuit, Drive Protecting Circuit and brshless DC motor to and main control chip is connected; optical coupling isolation circuit is connected with main control chip and driving inverter circuit, drives inverter circuit and is connected with light-coupled isolation and brshless DC motor.The main control circuit part, the circuit take TMS320F2812DSP as core, it act as: measure rotating speed and phase current feedback value, finish the computing of speed ring and current loop controller, produce the pwm signal of control motor, control IGBT switch; Power varying circuit part is built by six IGBT, and its effect is under the control of pwm signal, and operating voltage is added on three phase windings of motor by rule, makes machine operation; Testing circuit mainly detects position signalling and the current feedback signal of motor, and delivers among the DSP; Protective circuit is mainly used in partly preventing IGBT because of overcurrent that short circuit or some other accident are burned, and mainly contain the over-and under-voltage protection, overcurrent protection, overheat protector.

This control method is divided into control system main program and initialize routine two parts;

The control system main program mainly finish variable declarations, system initialization, interrupt vector table etc. is set.This program may further comprise the steps:

1) variable and function declaration;

2) system initialization subprogram;

3) close interruption;

4) enable T2 cycle interruption and kernel interrupt INT 3;

5) open interruption;

6) BackTicker value of the every execution of circular wait adds 1;

7) check whether the T2 counter cycle is mated, do not mate execution in step 6;

8) interrupt service subroutine.

Initialize routine comprises the initialization to the each several part of whole DSP.At first task manager is carried out initialization, the timer T2 of task manager EVA begins timing.Initialization GPIO is that the PWM1～PWM6 pin for EVA is set to peripheral functionality, and enters interruption in the generating period coupling.Carry out respectively afterwards PWM initialization, journal file initialization, CAPl～CAP3 pin is arranged to the digital quantity input state.ADC module initialization, the initialization of speed computing module, trapping module initialization, speed by PID initialization, current PI D initialization.So since 2812 be the fixed point DSP in program, to carry out the Q format conversion.This program may further comprise the steps:

1) system initialization;

2) interrupt vector table initialization;

3) the timer 2 initialization of EVA;

4) PWM module initialization;

5) ADC module initialization;

6) speed calculation module initialization;

7) capture module initialization;

8) PID module initialization;

9) EP (end of program).

Advantage of the present invention: it is that core realizes the control to motor movement that control system adopts up-to-date brshless DC motor special integrated circuit, has that real-time is good, control precision is high, the system reliability advantages of higher.

Description of drawings

Fig. 1 is the control system structured flowchart;

Fig. 2 is the Control System Software flow chart;

Fig. 3 is the control system initialization flowchart.

Embodiment

Detailed construction of the present invention is illustrated in conjunction with the embodiments.

This control system structured flowchart as shown in Figure 1, Master control chip is selected TMS320LF2812, outside extended chip is selected IS61LV6416, power drive chip selection IR2132, the isolation optocoupler is selected 6N137.

Control system mainly is comprised of main control module, power driver module and brshless DC motor, the signal output port PWM1-PWM6 of main control module is connected with the signal input port V+ of optical coupling isolation circuit in the power driver module, and power driver module output signal port is connected with brshless DC motor.Main control module by control chip, crystal oscillator reseting module, power module, external expansion module form, crystal oscillator reseting module output, power module outlet, external expansion module output and main control chip power interface, reset clock interface X1 X2, CLKOUT and external expansion interface PS DS be connected; Power driver module is by the phase current testing circuit; rotor position detection circuit; optical coupling isolation circuit; Drive Protecting Circuit and driving inverter circuit form; the output port of phase current testing circuit; the output port that transfers position detecting circuit to; ADC port and the signal capture port of the output port of Drive Protecting Circuit and brshless DC motor body and main control chip are connected; the output of optical coupling isolation circuit; input port is connected with the input port of main control chip and the output port of driving inverter circuit, drives the input of inverter circuit; the output port of output port and light-coupled isolation and the winding of brshless DC motor are connected.The main control circuit part, the circuit take TMS320F2812DSP as core, it act as: measure rotating speed and phase current feedback value, finish the computing of speed ring and current loop controller, produce the pwm signal of control motor, control IGBT switch; Power varying circuit part is built by six IGBT, and its effect is under the control of pwm signal, and operating voltage is added on three phase windings of motor by rule, makes machine operation; Testing circuit mainly detects position signalling and the current feedback signal of motor, and delivers among the DSP; Protective circuit is mainly used in partly preventing IGBT because of overcurrent that short circuit or some other accident are burned, and mainly contain the over-and under-voltage protection, overcurrent protection, overheat protector.

The control system main program as shown in Figure 2, mainly finish variable declarations, system initialization, interrupt vector table etc. is set.This program may further comprise the steps:

9) variable and function declaration;

10) system initialization subprogram;

11) close interruption;

12) enable T2 cycle interruption and kernel interrupt INT 3;

13) open interruption;

14) BackTicker value of the every execution of circular wait adds 1;

15) check whether the T2 counter cycle is mated, do not mate execution in step 6;

16) interrupt service subroutine.

10) initialize routine comprises the initialization to the each several part of whole DSP as shown in Figure 3.At first task manager is carried out initialization, the timer T2 of task manager EVA begins timing.Initialization GPIO is that the PWM1～PWM6 pin for EVA is set to peripheral functionality, and enters interruption in the generating period coupling.Carry out respectively afterwards PWM initialization, journal file initialization, CAPl～CAP3 pin is arranged to the digital quantity input state.ADC module initialization, the initialization of speed computing module, trapping module initialization, speed by PID initialization, current PI D initialization.So since 2812 be the fixed point DSP in program, to carry out the Q format conversion.This program may further comprise the steps:

11) system initialization;

12) interrupt vector table initialization;

13) the timer 2 initialization of EVA;

14) PWM module initialization;

15) ADC module initialization;

16) speed calculation module initialization;

17) capture module initialization

18) PID module initialization

EP (end of program).

Claims

1. a control method for brushless direct current motor is characterized in that: be divided into control system main program and initialize routine two parts;

The control system main program mainly finish variable declarations, system initialization, interrupt vector table is set, this program may further comprise the steps:

(1) variable and function declaration;

(2) system initialization subprogram;

(3) close interruption;

(4) enable T2 cycle interruption and kernel interrupt INT 3;

(5) open interruption;

(6) BackTicker value of the every execution of circular wait adds 1;

(7) check whether the T2 counter cycle is mated, do not mate execution in step 6;

(8) interrupt service subroutine;

Initialize routine comprises the initialization to the each several part of whole DSP, at first task manager is carried out initialization, the timer T2 of task manager EVA begins timing, initialization GPIO, be that PWM1～PWM6 pin for EVA is set to peripheral functionality, and in the generating period coupling, enter interruption; Carry out respectively afterwards PWM initialization, journal file initialization, CAPl～CAP3 pin is arranged to the digital quantity input state; ADC module initialization, the initialization of speed computing module, trapping module initialization, speed by PID initialization, current PI D initialization, thus since 2812 be the fixed point DSP in program, to carry out the Q format conversion, this program may further comprise the steps:

(1) system initialization;

(2) interrupt vector table initialization;

(3) the timer 2 initialization of EVA;

(4) PWM module initialization;

(5) ADC module initialization;

(6) speed calculation module initialization;

(7) capture module initialization;

(8) PID module initialization;

(9) EP (end of program).