来源：http://www.jnmcd.com 发布时间：2019-05-07 浏览：次
Three major circuits of the stepper motor controller
Motor drive circuit: the step motor drive circuit is designed on the basis of H bridge circuit. It is a mature motor control plan to build a dual-h bridge drive circuit with discrete component MOS tube. The circuit is not complex, and it can be up to dozens of amperes according to the upper limit of different operating current of MOS tube. It is an ideal stepping motor driver plan.
Motor parameter measurement circuit: constantan resistance is selected for motor current sampling resistance. One end is connected under the H bridge, and the other end is connected with GND. The voltage and current signal conditioning circuit is constructed by LM324 operational amplifier, and the voltage is sent to MCU after following, which is built in M
The converter stops A/D sampling. The digital temperature core chip DS18B20 is selected for the temperature monitoring of the housing. It is attached to the outer surface of the motor housing, and the temperature parameters are monitored in real time and sent to the MCU.
Power supply and MCU control circuit: the drive circuit in the system is supplied with input voltage, and the MCU and bluetooth modules require an additional 3.3v voltage supply. The traditional linear voltage stabilizer is low in efficiency, large in size and has severe heating. Therefore, the dc-dc switching power supply mode is used to provide 3.3v voltage to ensure the normal operation of the device.
Circuit Composition of 2 Servo Motor Controller
Motor rectifier circuit: The main topology circuit of rectifier unit is three-phase full-bridge uncontrolled rectifier circuit, which is essentially a series of three-phase half-wave controllable rectifier circuits with common cathode and a group of common anode.
Power Driving Circuit: Power Driving Unit usually uses intelligent power module, through three-phase full-bridge rectifier circuit to stop rectifying the input three-phase electricity or municipal electricity, and get the corresponding DC. Power unit is a high-voltage converter component which uses power electronic devices to stop rectification, filtering and inversion. It is mainly composed of rectifier bridge, thyristor, electrolytic capacitor, IGBT and other devices. The whole process of power drive unit can be simply described as AC-DC-AC process.