Motor control system based on IP core of position sensor-free brushless direct-current motor
A brush DC motor and motor control technology, applied in the direction of electronic commutation motor control, control system, electrical components, etc., can solve the problems of increasing CPU burden, limiting motor completion, speed regulation range restriction, etc., achieving easy maintenance and avoiding delays , The effect of increasing the speed regulation range
Inactive Publication Date: 2012-07-18
HARBIN INST OF TECH
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Problems solved by technology
[0007] The purpose of the present invention is to solve the problem that the seriality of the software algorithm in the existing zero-crossing detection method will introduce a certain execution delay, and it will also increase the burden on the CPU and limit the completion of other control tasks of the motor; The potential zero-crossing detection method can only be used above 20% of the rated speed, and the speed range is greatly restricted. A motor control system based on the position sensorless brushless DC motor IP core is provided.
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specific Embodiment approach 1
[0021] Specific implementation mode one: the following combination Figure 1 to Figure 8 To illustrate this embodiment, the position sensorless brushless DC motor IP core 10 of this embodiment includes a multi-channel analog-to-digital conversion interface unit 101, a back EMF zero-crossing detection unit 102, a three-stage synchronous start module 103, a speed current double closed-loop negative Feedback PI regulator 104 and PWM controller 105,
[0022] The multi-channel analog-to-digital conversion interface unit 101 is used to send the received three-phase voltage sampling signal to the back EMF zero-crossing detection unit 102; it is also used to send the received bus current sampling signal to the speed current double closed-loop negative feedback PI Regulator 104;
[0023] The back EMF zero-crossing detection unit 102 is used to receive the three-phase voltage signal, and is also used to output the actual speed signal of the brushless DC motor to the speed current doubl...
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The invention relates to an IP core of a position sensor-free and brushless direct-current motor, belonging to the control field of a motor. The invention aims at solving the problems that the serializability of a software algorithm in the traditional zero-crossing detection method can cause a certain executing delay and also increase the burden of a CPU to limit the completion of other control tasks of the motor; and in addition, the traditional counter potential zero-crossing detection method only can be used when the rated rotary speed is over 20%, and then the speed regulating range is greatly limited. A multi-path analog-to-digital conversion interface unit of the invention receives sampling signals, a counter potential zero-crossing detection unit outputs an actual rotary speed and closed-loop phase exchanging signals, a three-section synchronous starting module receives turning signals and realizes the soft start of the motor, a rotary speed-current double-closed loop and negative feedback PI regulator receives start-stop signals and rotary speed inputted by a system, and finally a PWM controller processes the start-stop signals and the rotary speed according the inputted turning signals and the output signals of the three-section synchronous starting module, and outputs motor control signals to control the running of the brushless direct-current motor.
Description
technical field [0001] The invention relates to a control system based on a position sensorless brushless DC motor IP core, belonging to the field of motor control. Background technique [0002] Brushless DC Motor (BLDCM for short) is another name for trapezoidal wave permanent magnet synchronous motor. Its characteristic is that the air gap magnetic density distribution in the motor is a trapezoidal wave, so the back EMF waveform and current waveform of the motor are both trapezoidal waves. [0003] Compared with other types of motors, brushless DC motors have the characteristics of small size, high efficiency, large output, large starting torque, strong overload capacity, good dynamic characteristics, easy control, flexibility, and convenience. It has been widely used in medical treatment, CNC machine tools, robot control, electric vehicle drive and home appliance applications and other fields. The high-performance brushless DC motor needs to detect the rotor position in ...
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IPC IPC(8): H02P6/18H02P6/182
Inventor 杨春玲顾春阳李宪全陈宇万鹏
Owner HARBIN INST OF TECH