阅读说明：本技术 一种dsp无刷电机调速系统 (DSP brushless motor speed control system ) 是由 陈晓琪 陈杰 李文超 于 2018-07-22 设计创作，主要内容包括：一种DSP无刷电机调速系统,属于数字化处理技术领域,是主要由DSP、光耦隔离电路、IGBT模块、保护电路、无刷直流电机、编码器、电流检测模块、电流传感器、位置检测模块和转速检测模块组成的,其特征在于：所述DSP和光耦隔离电路相连接,光耦隔离电路和IGBT模块相连接,保护电路和IGBT模块相连接,无刷直流电机和IGBT模块相连接,编码器与无刷直流电机相连接,本发明的DSP无刷电机调速系统,使无刷直流电机控制实现数字化,使无刷直流电机实现自动控制。(The utility model provides a DSP brushless motor speed governing system, belongs to digital processing technology field, is mainly by DSP, opto-coupler isolation circuit, IGBT module, protection circuit, brushless DC motor, encoder, current detection module, current sensor, position detection module and rotational speed detection module constitute, its characterized in that: the DSP is connected with the optical coupling isolation circuit, the optical coupling isolation circuit is connected with the IGBT module, the protection circuit is connected with the IGBT module, the brushless direct current motor is connected with the IGBT module, and the encoder is connected with the brushless direct current motor.)

1. The utility model provides a DSP brushless motor speed governing system, is mainly by DSP, opto-coupler isolation circuit, IGBT module, protection circuit, brushless DC motor, encoder, current detection module, current sensor, position detection module and rotational speed detection module constitute, its characterized in that: DSP is connected with opto-coupler isolation circuit, and opto-coupler isolation circuit is connected with the IGBT module, and protection circuit is connected with the IGBT module, and brushless DC motor is connected with the IGBT module, and the encoder is connected with brushless DC motor, and current detection module is connected with current sensor, and current sensor is connected with brushless DC motor, and position detection module is connected with brushless DC motor, and rotational speed detection module is connected with the encoder.

2. The DSP brushless motor speed control system of claim 1, wherein: the DSP adopts a digital signal processor with the model of TMS320F28335, and ADC analog power supply and I/O analog power supply, CPU core digital power supply and I/O digital power supply need to provide power supply; the method adopts an inner core voltage of +1.9V and an I/O voltage of +3.3V, under the normal condition, the inner core is recommended to be electrified earlier than the I/O, otherwise an uncertain state is generated, the whole system is possibly influenced, the simultaneous electrification can also be adopted, the integrated voltage conversion chip U1 inputs +5V and outputs a digital voltage of +3.3V, and the digital voltage of +3.3V is converted into an analog 3.3V through magnetic beads and a capacitor; the integrated voltage conversion chip U1 inputs +5V and outputs +1.9V digital voltage, and the +1.9V digital voltage is converted into analog 1.9V through magnetic beads and capacitors.

3. The DSP brushless motor speed control system of claim 1, wherein: the protection circuit detects bus current in the strong current inverter circuit through the Hall current sensor, if an overcurrent phenomenon occurs, the ITRIP end outputs high level, the IGBT is controlled to stop working, an ITRIP signal is sent to the DSP through light accident isolation, a program is interrupted through software, and PWM wave generation is locked; when overvoltage occurs, the ITRIP outputs high level as the overcurrent principle, so that the IGBT stops working, an ITRIP level signal is input into the DSP through light accident isolation, a program is interrupted through software, and PWM wave generation is locked; when the voltage is lower than 75V, the IGBT stops working, and the motor stops working, and the principle of the motor is the same as that of overvoltage protection.

Technical Field

The invention relates to a speed regulating system of a DSP brushless motor, belonging to the technical field of digital processing.

Background

The brushless direct current motor is popular due to the demand of scientific and technological development, and the brushless direct current motor replaces the prior mechanical commutation mode by electronic commutation, is easy to realize and maintain, has stable operation and high efficiency, no excitation loss, excellent torque characteristic and good speed regulation performance. Nowadays, brushless dc motors are becoming more and more popular, and their applications in the fields of aerospace, industrial control, medical devices, home appliances, etc. are increasing. The invention develops a speed regulating system of a DSP brushless motor.

Disclosure of Invention

Aiming at the defects, the invention provides a speed regulating system of a DSP brushless motor.

The invention is realized by the following technical scheme: the utility model provides a DSP brushless motor speed governing system, is mainly by DSP, opto-coupler isolation circuit, IGBT module, protection circuit, brushless DC motor, encoder, current detection module, current sensor, position detection module and rotational speed detection module constitute, its characterized in that: DSP is connected with opto-coupler isolation circuit, and opto-coupler isolation circuit is connected with the IGBT module, and protection circuit is connected with the IGBT module, and brushless DC motor is connected with the IGBT module, and the encoder is connected with brushless DC motor, and current detection module is connected with current sensor, and current sensor is connected with brushless DC motor, and position detection module is connected with brushless DC motor, and rotational speed detection module is connected with the encoder.

The DSP adopts a digital signal processor with the model of TMS320F28335, and ADC analog power supply and I/O analog power supply, CPU core digital power supply and I/O digital power supply need to provide power supply; the method adopts an inner core voltage of +1.9V and an I/O voltage of +3.3V, under the normal condition, the inner core is recommended to be electrified earlier than the I/O, otherwise an uncertain state is generated, the whole system is possibly influenced, the simultaneous electrification can also be adopted, the integrated voltage conversion chip U1 inputs +5V and outputs a digital voltage of +3.3V, and the digital voltage of +3.3V is converted into an analog 3.3V through magnetic beads and a capacitor; the integrated voltage conversion chip U1 inputs +5V and outputs +1.9V digital voltage, and the +1.9V digital voltage is converted into analog 1.9V through magnetic beads and capacitors.

The protection circuit detects bus current in the strong current inverter circuit through the Hall current sensor, if an overcurrent phenomenon occurs, the ITRIP end outputs high level, the IGBT is controlled to stop working, an ITRIP signal is sent to the DSP through light accident isolation, a program is interrupted through software, and PWM wave generation is locked; when overvoltage occurs, the ITRIP outputs high level as the overcurrent principle, so that the IGBT stops working, an ITRIP level signal is input into the DSP through light accident isolation, a program is interrupted through software, and PWM wave generation is locked; when the voltage is lower than 75V, the IGBT stops working, and the motor stops working, and the principle of the motor is the same as that of overvoltage protection.

The invention has the advantages that: the DSP brushless motor speed regulating system of the invention realizes the digitization of the control of the brushless DC motor and the automatic control of the brushless DC motor.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

In the figure, 1, DSP, 2, optical coupling isolation circuit, 3, IGBT module, 4, protection circuit, 5, brushless DC motor, 6, encoder, 7, current detection module, 8, current sensor, 9, position detection module, 10, and rotation speed detection module.

Detailed Description

The utility model provides a DSP brushless motor speed governing system, is mainly by DSP1, opto-isolator circuit 2, IGBT module 3, protection circuit 4, brushless DC motor 5, encoder 6, current detection module 7, current sensor 8, position detection module 9 and rotational speed detection module constitute, its characterized in that: DSP1 is connected with opto-isolator circuit 2, and opto-isolator circuit 2 is connected with IGBT module 3, and protection circuit 4 is connected with IGBT module 3, and brushless DC motor 5 is connected with IGBT module 4, and encoder 6 is connected with brushless DC motor 5, and current detection module 7 is connected with current sensor 8, and current sensor 8 is connected with brushless DC motor 5, and position detection module 9 is connected with brushless DC motor 5, and rotational speed detection module 10 is connected with encoder 6.

The DSP1 adopts a digital signal processor with the model of TMS320F28335, and ADC analog power supply and I/O analog power supply, CPU core digital power supply and I/O digital power supply need to be provided; the method adopts an inner core voltage of +1.9V and an I/O voltage of +3.3V, under the normal condition, the inner core is recommended to be electrified earlier than the I/O, otherwise an uncertain state is generated, the whole system is possibly influenced, the simultaneous electrification can also be adopted, the integrated voltage conversion chip U1 inputs +5V and outputs a digital voltage of +3.3V, and the digital voltage of +3.3V is converted into an analog 3.3V through magnetic beads and a capacitor; the integrated voltage conversion chip U1 inputs +5V and outputs +1.9V digital voltage, and the +1.9V digital voltage is converted into analog 1.9V through magnetic beads and capacitors.

The protection circuit 4 detects bus current in the strong current inverter circuit through a Hall current sensor, if an overcurrent phenomenon occurs, an ITRIP end outputs high level, the IGBT is controlled to stop working, an ITRIP signal is sent to the DSP through light accident isolation, a program is interrupted through software, and PWM wave generation is locked; when overvoltage occurs, the ITRIP outputs high level as the overcurrent principle, so that the IGBT stops working, an ITRIP level signal is input into the DSP through light accident isolation, a program is interrupted through software, and PWM wave generation is locked; when the voltage is lower than 75V, the IGBT stops working, and the motor stops working, and the principle of the motor is the same as that of overvoltage protection.

When the device works, the Hall current sensor converts phase current signals in the brushless direct current motor into voltage signals, the voltage signals are sent to two paths of ADC conversion channels on the DSP chip by following the voltage of the double operational amplifier chip U1, and finally digital quantity is obtained through conversion. The phase current is sampled and operated by the DSP, so that the error between the given current and the feedback current can be obtained, and the duty ratio of the PWM wave is adjusted through the operation of the current regulator. The method comprises the steps of selecting a photoelectric rotary encoder to measure the speed of the brushless direct current motor, entering an incremental photoelectric encoder interface unit of the DSP to sample and calculate the speed, obtaining the error between the given speed of the motor and the actual feedback speed of the motor, and adjusting the current loop through the calculation of a speed adjuster. The power driving circuit adopts an integrated power device IGBT, and compared with a power driving circuit formed by using separated elements, the power driving circuit adopts the IGBT which is safe, stable and reliable.

It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.