The difference between stepper motor controller and servo motor controller!

by:V&T Technologies     2020-01-15
The difference between stepper motor controller and servo motor controller! Stepping Motor controller is a widely used controller, so is Servo Motor Servo motor controller, which is essential in industrial production automation equipment. Stepping motor is an induction motor, its working principle is to use electronic circuits to convert direct current into time-sharing power supply, and multi-phase timing control current. Only when this current is used to supply power to the stepping motor can the stepping motor work normally, the driver is a multi-phase timing controller that supplies time-sharing power to the stepping motor. The servo system enables the output controlled quantity of the object's position, orientation, state, etc. to follow the input target (Or a given value)The automatic control system of any change. The servo motor is mainly positioned by pulses, which can be basically understood in this way. When the servo motor receives a pulse, it will rotate the angle corresponding to a pulse, thus realizing displacement, because, the servo motor itself has the function of sending out pulses, so every time the servo motor rotates at an angle, it will send out a corresponding number of pulses, thus forming a Echo with the pulses received by the servo motor, or a closed loop, in this way, the system will know how many pulses are sent to the servo motor and how many pulses are received at the same time, so that the rotation of the motor can be accurately controlled, so as to realize accurate positioning, which can reach 0. 001mm. Stepping Motor and servo motor are the two most widely used products in industrial control field, and their cores are stepping motor controller and servo motor controller respectively, what is the difference between the two controllers? I. Different stepping motor controllers with working principles: it is an electronic product capable of emitting uniform pulse signals. After the signals it sends enter the stepping motor driver, the driver will be converted into a strong current signal required by the stepping motor to drive the stepping motor to operate. The stepping motor controller can accurately control the stepping motor to turn every angle. What the driver receives is a pulse signal. Every time a pulse is received, the driver will give the motor a pulse to make the motor turn at a fixed angle. Because of this characteristic, stepping motors will be widely used in various industries now. Servo motor controller: it is a controller used to control servo motor. Its function is similar to that of frequency converter acting on common AC motor. It is part of servo system and is mainly applied to high-precision positioning system. Generally, the servo motor is controlled by position, speed and torque to realize high-precision positioning of the transmission system. At present, it is a high-end product of transmission technology. Second, the composition is also different 1, the three major circuits of the stepper motor controller (1) Motor drive circuit: design stepping motor drive circuit based on H-bridge circuit. Using Discrete component MOS tubes to build a double H-bridge drive circuit is a mature motor control scheme. The circuit is not complicated. According to the upper limit of different working currents of MOS tubes, it can even reach tens of amperes, it is an ideal stepping motor driver scheme. (2) Motor parameter measurement circuit: the motor current sampling resistor is a constantan resistor, one end is connected to the lower side of H bridge, and the other end is connected to GND. The voltage and current signal conditioning circuit is built by LM324 operational amplifier, and the voltage is sent to MCU after following. MCU has built-in 10Bit A/D converter for A/D sampling. The shell temperature monitoring adopts digital temperature chip DS18B20, which is pasted on the surface of the motor shell to monitor the temperature parameters in real time and send them to MCU. (3) Power supply and MCU control circuit: the drive circuit in the system is powered by input voltage, MCU and Bluetooth module need additional 3. 3V voltage supply, the traditional linear regulator has low efficiency, large size and serious heating, so DC-DC switching power supply mode provides 3. 3V voltage to ensure the normal operation of the device. 2. Circuit composition of servo motor controller (1) Motor rectifier circuit: the main topological circuit of the rectifier unit is a three-phase full-bridge uncontrolled rectifier circuit, which is essentially a series connection of a group of common cathodes and a group of common anode three-phase half-wave controllable rectifier circuits, the three intergranular tubes that are used to connect the cathodes together are called common cathode groups; The three transistors connected by the anodes are called common anode groups. (2) Power Drive circuit: the Power Drive unit generally adopts an intelligent power module, which rectifies the input three-phase power or commercial power through a three-phase full-bridge rectifier circuit to obtain the corresponding DC. The power unit is a high-voltage Inverter component that uses power power electronic devices for rectification, filtering and inversion. It is mainly composed of rectifier Bridge, silicon controlled rectifier, electrolytic capacitor, IGBT and other devices. The whole process of the Power Drive unit can be simply said to be AC-DC-AC process. (3) Motor control circuit: the main circuit uses digital signal processor as the control core, which can realize more complex control algorithms and carry out intelligent control. TAG stepper motor
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